WO1990007419A1 - Punctual glueing process and inductive heating apparatus for implementing said process - Google Patents

Punctual glueing process and inductive heating apparatus for implementing said process Download PDF

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Publication number
WO1990007419A1
WO1990007419A1 PCT/BE1988/000034 BE8800034W WO9007419A1 WO 1990007419 A1 WO1990007419 A1 WO 1990007419A1 BE 8800034 W BE8800034 W BE 8800034W WO 9007419 A1 WO9007419 A1 WO 9007419A1
Authority
WO
WIPO (PCT)
Prior art keywords
induction
gun
elements
housing
assembled
Prior art date
Application number
PCT/BE1988/000034
Other languages
French (fr)
Inventor
Willy Chapeau
Jacques Pelerin
Original Assignee
Societe Anonyme Phenix Works
S.P.R.L. Applications Industrielles De Technologies Nouvelles, A.I.T.N.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Societe Anonyme Phenix Works, S.P.R.L. Applications Industrielles De Technologies Nouvelles, A.I.T.N. filed Critical Societe Anonyme Phenix Works
Priority to PCT/BE1988/000034 priority Critical patent/WO1990007419A1/en
Priority to EP89900567A priority patent/EP0449806A1/en
Publication of WO1990007419A1 publication Critical patent/WO1990007419A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/44—Joining a heated non plastics element to a plastics element
    • B29C65/46—Joining a heated non plastics element to a plastics element heated by induction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7855—Provisory fixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91653—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the voltage, i.e. the electric potential difference or electric tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • B29C66/92431—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power the pressure, the force or the mechanical power being kept constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys

Definitions

  • the present invention relates to a method of spot bonding of two elements, at least one of which may be a pre-coated sheet and an induction heating apparatus for implementing this method.
  • pre-coated sheet is meant tin-plated sheet, galvanized sheet, sheet with organic coating, lead sheet and pre-coated aluminum sheet.
  • prepainted sheets are called for a great boom in the building field and the industrial field such as household appliances and furniture for example.
  • market demand in the aforementioned fields is largely determined by the aesthetic appearance of the finished product, which requires that the fixing means be hidden as much as possible.
  • the use of pre-coated sheets is therefore conditioned to a very large extent by the method of assembling these sheets.
  • Bonding according to the known technique, has drawbacks which limit its use in the industry. First, bonding is only suitable for joining an uncoated face to an uncoated face. Second, bonding requires careful preparation of the surfaces. Finally, it requires holding the parts to be assembled in place for the time necessary to achieve adhesion from one part to another. These constraints impose prohibitive handling times in a production line.
  • a first object of the invention is an induction heating device comprising at least one induction pisto ⁇ consisting of a rigid housing capable of transmitting a pressure force applied to it, the housing containing a solenoid wound around it.
  • the solenoid being connected to the terminals of a resonant LC circuit connected to the output of a generator of electrical signals at medium or high frequency to supply the solenoid with electrical current in the form of energy peaks so as to produce in the ferrite core intense magnetic fluxes of predetermined short duration
  • the high permeability ferrite core having a U-shape, the vertical branches of the U-shaped profile extending perpendicularly to the face of the housing intended to come into contact with one of the elements to be assembled, the spacing between the vertical branches of the U-shaped profile determining the longitudinal extent of a bonding point.
  • the induction gun housing is designed to be fixed on a manipulator used to position the induction pistol against one of the elements to be assembled, with a pressure force, the manipulator comprising a control means arranged to hold the gun inducing in pressure state against said element for a predetermined time interval.
  • the subject of the invention is also a method of point bonding of two elements, by which the joint consisting of the two elements between which a bead of bonding product is extended is held below at least one spray gun.
  • induction fixed on a manipulator; the manipulator moves the induction gun and positions it against one of the elements to assemble by applying a pressure force during a predetermined time interval while the induction gun is supplied in order to produce a magnetic induction flux; the manipulator moves aside the induction gun from said element after the expiration of the predetermined time interval; the elements are moved longitudinally by a predetermined length in order to present the position of another bonding point under the induction gun; repetition of the handling of the induction gun and of the elements to be assembled for each pre-bonding point.
  • FIG. 4 is a diagram of an exemplary embodiment of the heater according to the invention.
  • FIG. 5 shows a sectional view of an inductive gun according to the invention.
  • the bonding method according to the invention is a point bonding method.
  • the two parts to be assembled are arranged with overlap as shown in Figure 1 with a bead of bonding product between the overlapping parts.
  • the numbers 1 and 2 designate two flat parts, for example pre-coated steel sheets
  • the number 3 designates a bead of bonding product, for example a bead of structural adhesive.
  • the number 4 designates a support carrying the part 1.
  • the bead of bonding product 3 is locally heated at a certain number of points distributed along its length so as to cause the necessary bonding phenomena for achieving perfect attachment. between the parts to be assembled.
  • the local heating of the cord 3 is carried out by means of an induction gun 5.
  • This induction gun is mounted on a manipulator for example in order to be able to be positioned against the part 2 (FIG. 2) and to transmit a force of pressure P which squeezes the elements of the assembly 1 - 3 - 2 against each other while producing a magnetic induction flux for a predetermined time interval in order to locally heat the bead of bonding product 3.
  • P force of pressure
  • the induction gun 5 is moved away from the part 2 (FIG. 3) and the process is repeated for other bonding points, that is to say in d other inconspicuous places along the edge of the room 2.
  • FIG. 4 there is shown a block diagram of an exemplary embodiment of the point heating apparatus according to the invention.
  • an induction gun 5 which is electrically connected to an electric power generator identified as a whole by the number 10.
  • the number of induction guns can obviously be arbitrary.
  • the generator is intended to supply each induction gun with a voltage at medium frequency for a predetermined short period of time.
  • Each induction gun is arranged to produce an intense magnetic field in order to locally heat the bead of bonding product 3 between the parts to be assembled with sufficient energy and for a predetermined interval of time sufficient for the necessary bonding phenomena to achieve perfect attachment between the elements to be assembled can occur, but without altering the coatings in areas where they are not in contact with the bonding product 3.
  • the induction gun 5 includes a rigid housing in which an inductor and the necessary control members are housed.
  • An exemplary embodiment is illustrated in FIG. 5.
  • the rigid housing here consists of a prismatic metal body 6 and a head 7, the base 8 of which has a shape and an area adapted to the surface of the points to be heated.
  • the metal body 6 is for example an aluminum body on which the protective sheath 9 is fixed for the power cable coming from the energy generator.
  • the body is provided with any means (not shown) for fixing to a manipulator used to position the gun relative to the parts to be assembled as will be seen below.
  • the body 6 can be cooled by a flow of cold air supplied by a pipe 21 housed in the sheath 9.
  • the head 7 contains an inductor 11 and a temperature measuring element 12.
  • the head 7 is made for example of a material such as Teflon (brand deposited) loaded with glass fiber in order to produce an element resistant to thermal stresses and allowing a pressurization of the elements to be assembled.
  • the inductor 11 consists of a solenoid 13 wound around a core 14 of high permeability ferrite to serve to channel and amplify the magnetic flux generated by the solenoid when the latter is supplied by the voltage waves produced by the generator.
  • the ferrite core 14 has a U shape, the lateral branches of which extend perpendicular to the base 8 of the head 7 which is intended to come into contact with the part 2.
  • the spacing between the lateral branches of the core 14 determines the longitudinal extent of the area which forms a bonding point according to the invention.
  • a flexible interlayer can be inserted between the base 8 of the head 7 and the body 6 in order to ensure good seating of the head on the part 2 in cases where the automatic positioning of the gun is not always repetitive with constant precision.
  • the generator 10 comprises an oscillator 15 for generating variable voltages at medium or high frequency (for example a few tens of kilohertz).
  • the output of the oscillator 15 is amplified in a power amplifier 16 with adjustable gain, the output of which flows into the primary 17a of an output transformer 17.
  • the secondary of the transformer 17 feeds the gun (s) induction 5.
  • the transformer 17 provides the required impedance matching.
  • a capacitor 18 In parallel on the secondary winding 17b of the transformer 17 is connected a capacitor 18 whose capacity forms a resonant circuit with the inductance of the winding so that the energy applied to the gun 5 is delivered in the form of spikes. high intensity voltage.
  • the rectangle denoted 19 re ⁇ presents an adjustment circuit for the oscillator 15.
  • the apparatus according to the invention is advantageously supplemented with electronic command and control devices.
  • an automatic regulation system of the power delivered by the oscillator 15 in order to maintain the temperature on the surface of the elements to be assembled at a predetermined value.
  • Such a regulation system represented by the rectangle identified by the number 22, compares the temperature measured by a temperature measuring element as shown at 12 in the induction head 7 to a predetermined set value and produces a signal for adjusting the oscillator 15 as a function of the measured temperature difference.
  • a programmer 23 can also be provided to automatically control the heating cycle according to a preset program. The programmer 23 produces control signals for the oscillator in order to fix the heating times and the breaking times.
  • the push buttons 24 allow manual setting of the programmer.
  • a timer 25 can also be provided to fix the time for maintaining the pressure P on the parts to be assembled.
  • Such a timer 25 is, for example, triggered by the closing of a contact 27 housed in the body 6 of the gun 5.
  • the time for maintaining the pressure during the heating phase and during the cooling phase is indeed im ⁇ bearing to ensure perfect attachment of the elements to be assembled and the bonding product.
  • the timer 25 also controls a solenoid valve 28 for sending compressed air into the pipe 21 to cool the body 6 of the induction gun 5.
  • the implementation of the apparatus according to the invention is simple.
  • the induction gun 5 is fixed by any means on a manipulator intended to move the gun vertically, induction head down.
  • the overlap area of the two elements to be assembled 1 and 2 with a bead of bonding product 3 between them is brought under the induction gun 5 (FIG. 1).
  • the generator is started, the heating time setting is possibly adjusted and the manipulator is put into operation.
  • the manipulator positions the induction gun 5 with his head against the part 2 and applies a predetermined vertical pressure force P for a predetermined period of time while the solenoid 13 is excited by a current produced by the generator.
  • the induction time is for example of the order of 5 to 10 seconds to assemble parts of pre-coated steel sheets 0.7 to 1 mm thick depending on the nature of the coating and the thickness of the sheets put artwork.
  • the induction time is sufficient to accelerate the polymerization of the binding product.
  • the manipulator dismisses the induction gun 5 from the part 2 and the parts 1 and 2 are moved to allow the realization of another bonding point.
  • the manipulator again positions the induction gun against the part 2 for a new pressure / induction cycle and the process is repeated for each planned bonding point.
  • bonding point is meant a small area of attachment, for example an area of the order of 20 to 50 mm 2 depending on the application.
  • the polymerization of the bead of bonding product can then be carried out either by natural polymerization from said accelerated polymerized points, or by a subsequent thermal operation generally already inserted in a production line.
  • the attachment is a chemical attachment between the coating of the parts to be assembled and the adhesive by polymerization of the latter. Induction heating in this case serves to accelerate the polymerization of the adhesive.
  • the device according to the invention allows the bonding by points of two elements, even when one or both of them are pre-coated parts, for example a prepainted sheet. This is how we have successfully carried out the fixing of transverse metal stiffeners on metal door panels, the fixing of a thermoformable plastic door against a prepainted metal door, and the fixing of a Teflon coating on a prepainted metal part to cite some exemplary achievements.
  • the apparatus according to the invention allows a high assembly speed. , which makes it possible to integrate it profitably into an industrial manufacturing line.

Abstract

Two elements, one of which at least can be a precoated sheet of metal, are punctually glued together by means of an inductive heater including at least one induction pistol (5) comprised of a rigid housing (6, 7) capable of transmitting a pressure force it receives. The housing contains a solenoid (13) wound around a highly permeable ferrite core (14) and connected to the terminals of an LC resonant circuit (17-18) connected to the output of a medium or high-frequency electrical signal generator (10) to feed electrical current to the solenoid in the form of peaks of energy, thus producing in the ferrite core (14) intensive magnetic fluxes of a predetermined short duration. The highly permeable ferrite core is U-shaped, the vertical arms of the U-shaped profile extending perpendicularly to the face (8) of the housing (6) designed to come into contact with one of the elements to be assembled; the distance between the vertical arms of the U-shaped profile determines the longitudinal extent of a glueing point.

Description

Procédé de collage par points et appareil de chauffage par induction pour la mise en oeuvre de ce procédé Spot bonding process and induction heating apparatus for carrying out this process
DescriptionDescription
Domaine techniqueTechnical area
La présente invention concerne un procédé de collage par points de deux éléments dont un au moins peut être une tôle prérevêtue et un appareil de chauffage par induction pour la mise en oeuvre de ce procédé. Par tôle prérevêtue on entend les tôles étamées , les tôles galvanisées, les tôles à revêtements organiques, les tôles plombées et les tôles d'aluminium prérevêtues.The present invention relates to a method of spot bonding of two elements, at least one of which may be a pre-coated sheet and an induction heating apparatus for implementing this method. By pre-coated sheet is meant tin-plated sheet, galvanized sheet, sheet with organic coating, lead sheet and pre-coated aluminum sheet.
L'utilisation de ces tôles prérevetues est appelée à un grand essor dans le domaine du bâtiment et le domaine industriel tel que l'électroménager et le mobilier par exemple. Toutefois, la demande du marché dans les domaines précités est largement déterminée par l'aspect esthétique du produit fini qui exige que les moyens de fixation soient autant que possible dissimulés. L'utilisation de tôles prérevêtues est donc conditionnée dans une très large mesure par le mode d'assemblage de ces tôles.The use of these prepainted sheets is called for a great boom in the building field and the industrial field such as household appliances and furniture for example. However, market demand in the aforementioned fields is largely determined by the aesthetic appearance of the finished product, which requires that the fixing means be hidden as much as possible. The use of pre-coated sheets is therefore conditioned to a very large extent by the method of assembling these sheets.
Technique antérieurePrior art
Parmi les modes d'assemblage des tôles prérevêtues on peut distinguer essentiellement quatre techniques : les assemblages mécaniques, le soudage, le brasage et le collage. Les procédés d'assemblage mécanique, tels que l'agrafage, l'insertion de profilés de liaison, le recouvrement des joints, le boulonnage, le vissage, le rivetage ont souvent pour inconvénient, s'il faut comme dit ci-dessus dissimuler les points de fixation, d'exiger plusieurs opérations successives de pliage et de percement qui les rendent onéreuses. D'autre part, le rivetage et le vissage concentrent les tensions de la tôle sur les endroits de fixations et font naître des risques de détérioration en ces endroits, dont la corrosion.Among the methods of assembling the pre-coated sheets, one can essentially distinguish four techniques: mechanical assemblies, welding, brazing and bonding. Mechanical assembly processes, such that stapling, insertion of connection profiles, covering of joints, bolting, screwing, riveting often have the disadvantage, if it is necessary, as mentioned above, to conceal the fixing points, to require several successive folding and drilling operations which make them expensive. On the other hand, riveting and screwing concentrate the sheet tensions on the fixing locations and give rise to risks of deterioration in these locations, including corrosion.
Le soudage et le brasage ne sont pratiquement applica¬ bles qu'aux tôles galvanisées qui de toute manière doivent encore subir un traitement de finition ulté- rieur car ces techniques détériorent le revêtement.Welding and brazing are practically only applicable to galvanized sheets which in any case must still undergo a subsequent finishing treatment because these techniques deteriorate the coating.
Le collage, suivant la technique connue, présente des inconvénients qui en limitent l'utilisation dans l'in¬ dustrie. En premier lieu, le collage ne convient que pour unir une face non revêtue à une face non revêtue. En second lieu, le collage nécessite une soigneuse opération de préparation des surfaces. Enfin, il exige le maintien en place des pièces à assembler pendant le temps nécessaire à la réalisation de l'adhérence d'une pièce à l'autre. Ces contraintes imposent des temps de manutention prohibitifs dans une chaîne de fabrica¬ tion.Bonding, according to the known technique, has drawbacks which limit its use in the industry. First, bonding is only suitable for joining an uncoated face to an uncoated face. Second, bonding requires careful preparation of the surfaces. Finally, it requires holding the parts to be assembled in place for the time necessary to achieve adhesion from one part to another. These constraints impose prohibitive handling times in a production line.
Le choix de colles dites structurales , telles que les colles de la famille des polyurêthanes ou des époxy, permet de réaliser des assemblages ayant de bonnes caractéristiques mécaniques et ne nécessitant pas de tolérances d'accostage ni des conditions de propreté des pièces à assembler incompatibles avec les proces- sus de fabrication usuels dans les industries concer- nées. Le collage à l'aide de colles structurales apparaît donc comme un mode d'assemblage privilégié pour les tôles prérevêtues et tout particulièrement les tôles à revêtements organiques .The choice of so-called structural adhesives, such as adhesives from the polyurethane or epoxy family, makes it possible to produce assemblies having good mechanical characteristics and requiring no docking tolerances or conditions of cleanliness of the parts to be assembled incompatible with the usual manufacturing processes in the industries concerned born. Bonding using structural adhesives therefore appears to be a preferred method of assembly for pre-coated sheets and very particularly sheets with organic coatings.
Toutefois, la mise en oeuvre industrielle des colles structurales implique en pratique l'utilisation d'ac¬ célérateurs de polymérisation car leur polymérisation naturelle nécessiterait un temps de maintien en contact de plusieurs heures. L'accélération de polymé¬ risation pourrait se faire par voie chimique mais cette façon de faire introduirait une contrainte sup¬ plémentaire souvent inacceptable étant donné que l'ac¬ célérateur de polymérisation diminue sensiblement la durée d'utilisation possible du mélange qui devien¬ drait inférieure au temps de polymérisation. L'accélé¬ ration de la polymérisation peut également se faire par voie thermique, mais l'utilisation de moyens tels que étuve ou four entraîne des investissements élevés, une immobilisation de matériels, des moyens de manu¬ tention considérables et éventuellement des surfaces de stockage intermédiaires importantes qui annihilent les avantages économiques résultant de l'accélération de la polymérisation.However, the industrial implementation of structural adhesives implies in practice the use of polymerization accelerators because their natural polymerization would require a contact maintenance time of several hours. The acceleration of polymerization could be done chemically but this way of doing things would introduce an additional constraint which is often unacceptable since the polymerization accelerator significantly reduces the possible duration of use of the mixture which becomes less than the polymerization time. The acceleration of the polymerization can also be done thermally, but the use of means such as an oven or an oven results in high investment, immobilization of materials, considerable handling means and possibly storage surfaces. important intermediates which cancel out the economic advantages resulting from the acceleration of the polymerization.
Exposé de l'inventionStatement of the invention
L'invention apporte une solution au problème de l'ac- célération thermique de la polymérisation des colles structurales grâce à une technique et un dispositif qui permettent d'appliquer le procédé d'assemblage par collage aux tôles prérevêtues, notamment les tôles à revêtements organiques , et qui permettent de rencon- trer les exigences de fabrication des chaînes de pro¬ duction industrielles. Un premier objet de l'invention est un appareil de chauffage par induction comprenant au moins un pisto¬ let d'induction constitué d'un boîtier rigide capable de transmettre un effort de pression qui lui est appliqué, le boîtier contenant un solenoïde enroulé autour d'un noyau en ferrite à haute perméabilité, le solenoïde étant relié aux bornes d'un circuit réson¬ nant LC connecté à la sortie d'un générateur de si¬ gnaux électriques à moyenne ou haute fréquence pour alimenter le solenoïde en courant électrique sous forme de pointes d'énergie de manière à produire dans le noyau de ferrite des flux magnétiques intenses de courte durée prédéterminée, le noyau de ferrite à haute perméabilité ayant une forme en U, les branches verticales du profil en U s *étendant perpendiculaire¬ ment à la face du boîtier destinée à venir en contact avec un des éléments à assembler, l'ecartement entre les branches verticales du profil en U déterminant l'étendue longitudinale d'un point de collage.The invention provides a solution to the problem of thermal acceleration of the polymerization of structural adhesives by means of a technique and a device which make it possible to apply the assembly process by bonding to pre-coated sheets, in particular sheets with organic coatings. , and which make it possible to meet the manufacturing requirements of industrial production chains. A first object of the invention is an induction heating device comprising at least one induction pisto¬ consisting of a rigid housing capable of transmitting a pressure force applied to it, the housing containing a solenoid wound around it. '' a ferrite core with high permeability, the solenoid being connected to the terminals of a resonant LC circuit connected to the output of a generator of electrical signals at medium or high frequency to supply the solenoid with electrical current in the form of energy peaks so as to produce in the ferrite core intense magnetic fluxes of predetermined short duration, the high permeability ferrite core having a U-shape, the vertical branches of the U-shaped profile extending perpendicularly to the face of the housing intended to come into contact with one of the elements to be assembled, the spacing between the vertical branches of the U-shaped profile determining the longitudinal extent of a bonding point.
Le boîtier du pistolet d'induction est prévu pour être fixé sur un manipulateur servant à positionner le pis¬ tolet d'induction contre un des éléments à assembler, avec un effort de pression, le manipulateur comprenant un moyen de commande agencé pour maintenir le pistolet d'induction en état de pression contre ledit élément pendant un intervalle de temps prédéterminé.The induction gun housing is designed to be fixed on a manipulator used to position the induction pistol against one of the elements to be assembled, with a pressure force, the manipulator comprising a control means arranged to hold the gun inducing in pressure state against said element for a predetermined time interval.
L'invention a également pour objet un procédé de col- lage par points de deux éléments, par lequel le joint constitué des deux éléments entre lesquels est étendu un cordon de produit de liaison se trouve maintenu en dessous d'au moins un pistolet d'induction fixé sur un manipulateur; le manipulateur déplace le pistolet d'induction et le positionne contre un des éléments à assembler en y appliquant un effort de pression pen¬ dant un intervalle de temps prédéterminé tandis que le pistolet d'induction est alimenté afin de produire un flux d'induction magnétique; le manipulateur écarte le pistolet d'induction dudit élément après l'expiration de l'intervalle de temps prédéterminé; les éléments sont déplacés longitudinalement d'une longueur pré¬ déterminée afin de présenter sous le pistolet d'induc¬ tion la position d'un autre point de collage; répéti- tion des manipulations du pistolet d'induction et des éléments à assembler pour chaque point de collage prév .The subject of the invention is also a method of point bonding of two elements, by which the joint consisting of the two elements between which a bead of bonding product is extended is held below at least one spray gun. induction fixed on a manipulator; the manipulator moves the induction gun and positions it against one of the elements to assemble by applying a pressure force during a predetermined time interval while the induction gun is supplied in order to produce a magnetic induction flux; the manipulator moves aside the induction gun from said element after the expiration of the predetermined time interval; the elements are moved longitudinally by a predetermined length in order to present the position of another bonding point under the induction gun; repetition of the handling of the induction gun and of the elements to be assembled for each pre-bonding point.
L'invention apparaîtra plus clairement à la lecture de la description qui suit. Dans cette description, il est fait référence aux dessins ci-annexés.The invention will appear more clearly on reading the description which follows. In this description, reference is made to the accompanying drawings.
Description des dessinsDescription of the drawings
- Les figures 1 à 3 illustrent schêmatiquement le pro¬ cédé de collage par points selon l'invention.- Figures 1 to 3 illustrate schematically the process of point bonding according to the invention.
- La figure 4 est un schéma d'un mode d'exécution exemplaire de l'appareil de chauffage selon l'inven¬ tion.- Figure 4 is a diagram of an exemplary embodiment of the heater according to the invention.
- La figure 5 montre une vue en coupe d'un pistolet inducteur selon l'invention.- Figure 5 shows a sectional view of an inductive gun according to the invention.
Description d'un mode de réalisation exemplaireDescription of an exemplary embodiment
Le procédé de collage selon l'invention est un procédé de collage par points. Suivant ce procédé, les deux pièces à assembler sont disposées avec recouvrement comme montré à la figure 1 avec un cordon de produit de liaison entre les pièces qui se recouvrent. Dans cette figure les chiffres 1 et 2 désignent deux pièces planes, par exemple des tôles d'acier prérevêtues, et le chiffre 3 désigne un cordon de produit de liaison, par exemple un cordon de colle structurale. Le chiffre 4 désigne un support portant la pièce 1. Le cordon de produit de liaison 3 est chauffé localement en un certain nombre de points répartis sur sa longueur de manière à provoquer les phénomènes de liaison néces¬ saires pour la réalisation d'un accrochage parfait entre les pièces à assembler. Le chauffage local du cordon 3 est réalisé au moyen d'un pistolet d'induc¬ tion 5. Ce pistolet d'induction est monté sur un manipulateur par exemple pour pouvoir être positionné contre la pièce 2 (figure 2) et transmettre un effort de pression P qui serre les éléments de l'ensemble 1- 3-2 l'un contre l'autre tout en produisant un flux d'induction magnétique pendant un intervalle de temps prédéterminé afin de chauffer localement le cordon de produit de liaison 3. A la fin de l'intervalle de temps prédéterminé, le pistolet d'induction 5 est écarté de la pièce 2 (figure 3) et le processus se trouve répété pour d'autres points de collage, c'est- à-dire en d'autres endroits discrets le long du bord de la pièce 2.The bonding method according to the invention is a point bonding method. According to this process, the two parts to be assembled are arranged with overlap as shown in Figure 1 with a bead of bonding product between the overlapping parts. In this figure, the numbers 1 and 2 designate two flat parts, for example pre-coated steel sheets, and the number 3 designates a bead of bonding product, for example a bead of structural adhesive. The number 4 designates a support carrying the part 1. The bead of bonding product 3 is locally heated at a certain number of points distributed along its length so as to cause the necessary bonding phenomena for achieving perfect attachment. between the parts to be assembled. The local heating of the cord 3 is carried out by means of an induction gun 5. This induction gun is mounted on a manipulator for example in order to be able to be positioned against the part 2 (FIG. 2) and to transmit a force of pressure P which squeezes the elements of the assembly 1 - 3 - 2 against each other while producing a magnetic induction flux for a predetermined time interval in order to locally heat the bead of bonding product 3. A at the end of the predetermined time interval, the induction gun 5 is moved away from the part 2 (FIG. 3) and the process is repeated for other bonding points, that is to say in d other inconspicuous places along the edge of the room 2.
Se reportant à présent à la figure 4 on voit un schéma fonctionnel d'un mode d'exécution exemplaire de l'ap- pareil de chauffage par points selon l'invention. Dans ce schéma est représenté un pistolet d'induction 5 qui se trouve connecté électriquement à un générateur d'énergie électrique identifié dans son ensemble par le nombre 10. Le nombre de pistolets d'induction peut évidemment être quelconque. Le générateur est destiné à alimenter chaque pistolet d'induction par une ten¬ sion en moyenne fréquence pendant un laps de temps court prédéterminé.Referring now to Figure 4 there is shown a block diagram of an exemplary embodiment of the point heating apparatus according to the invention. In this diagram is shown an induction gun 5 which is electrically connected to an electric power generator identified as a whole by the number 10. The number of induction guns can obviously be arbitrary. The generator is intended to supply each induction gun with a voltage at medium frequency for a predetermined short period of time.
Chaque pistolet d'induction est agencé pour produire un champ magnétique intense afin de chauffer locale¬ ment le cordon de produit de liaison 3 entre les pièces à assembler avec une énergie suffisante et pendant un intervalle de temps prédéterminé suffisant pour que les phénomènes de liaison nécessaires à la réalisation de l'accrochage parfait entre les éléments à assembler puissent se produire, mais sans altérer toutefois les revêtements dans les zones où ils ne se trouvent pas en contact avec le produit de liaison 3.Each induction gun is arranged to produce an intense magnetic field in order to locally heat the bead of bonding product 3 between the parts to be assembled with sufficient energy and for a predetermined interval of time sufficient for the necessary bonding phenomena to achieve perfect attachment between the elements to be assembled can occur, but without altering the coatings in areas where they are not in contact with the bonding product 3.
Suivant l'invention, le pistolet d'induction 5 com¬ prend un boîtier rigide dans lequel sont logés un inducteur et les organes de contrôle nécessaires. Un mode d'exécution exemplaire est illustré à la figure 5. Le boîtier rigide est ici constitué d'un corps métallique prismatique 6 et d'une tête 7 dont la base 8 a une forme et une superficie adaptées à la surface des points à chauffer. Le corps métallique 6 est par exemple un corps en aluminium sur lequel se fixe la gaine de protection 9 pour le câble d'alimentation ve¬ nant du générateur d'énergie. Le corps est pourvu d'un moyen quelconque (non représenté) pour la fixation sur un manipulateur servant à positionner le pistolet par rapport aux pièces à assembler comme on le verra plus loin. Le corps 6 peut être refroidi par un flux d'air froid amené par un tuyau 21 logé dans la gaine 9.According to the invention, the induction gun 5 includes a rigid housing in which an inductor and the necessary control members are housed. An exemplary embodiment is illustrated in FIG. 5. The rigid housing here consists of a prismatic metal body 6 and a head 7, the base 8 of which has a shape and an area adapted to the surface of the points to be heated. . The metal body 6 is for example an aluminum body on which the protective sheath 9 is fixed for the power cable coming from the energy generator. The body is provided with any means (not shown) for fixing to a manipulator used to position the gun relative to the parts to be assembled as will be seen below. The body 6 can be cooled by a flow of cold air supplied by a pipe 21 housed in the sheath 9.
La tête 7 contient un inducteur 11 et un élément de mesure de température 12. La tête 7 est réalisée par exemple en une matière telle que le Téflon (marque déposée) chargé de fibre de verre afin de réaliser un élément résistant aux contraintes thermiques et per¬ mettant une mise sous pression des éléments à assem¬ bler. L'inducteur 11 est constitué d'un solenoïde 13 enroulé autour d'un noyau 14 en ferrite à haute permé¬ abilité pour servir à canaliser et amplifier le flux magnétique engendré par le solenoïde lorsque celui-ci est alimenté par les ondes de tension produites par le générateur. Comme illustré à la figure 5, le noyau en ferrite 14 a une forme en U dont les branches latéra¬ les s 'étendent perpendiculairement à la base 8 de la tête 7 qui est destinée à venir en contact avec la pièce 2. L'ecartement entre les branches latérales du noyau 14 détermine l'étendue longitudinale de la zone qui forme un point de collage selon l'invention. Un intercalaire souple peut être inséré entre la base 8 de la tête 7 et le corps 6 afin d'assurer une bonne assise de la tête sur la pièce 2 dans les cas où le positionnement automatique du pistolet n'est pas tou- jours répétitif avec une précision constante.The head 7 contains an inductor 11 and a temperature measuring element 12. The head 7 is made for example of a material such as Teflon (brand deposited) loaded with glass fiber in order to produce an element resistant to thermal stresses and allowing a pressurization of the elements to be assembled. The inductor 11 consists of a solenoid 13 wound around a core 14 of high permeability ferrite to serve to channel and amplify the magnetic flux generated by the solenoid when the latter is supplied by the voltage waves produced by the generator. As illustrated in FIG. 5, the ferrite core 14 has a U shape, the lateral branches of which extend perpendicular to the base 8 of the head 7 which is intended to come into contact with the part 2. The spacing between the lateral branches of the core 14 determines the longitudinal extent of the area which forms a bonding point according to the invention. A flexible interlayer can be inserted between the base 8 of the head 7 and the body 6 in order to ensure good seating of the head on the part 2 in cases where the automatic positioning of the gun is not always repetitive with constant precision.
Le générateur 10 comprend un oscillateur 15 pour géné¬ rer des tensions variables à moyenne ou haute fréquen¬ ce (par exemple quelques dizaines de kilohertz). La sortie de l'oscillateur 15 est amplifiée dans un am¬ plificateur de puissance 16 à gain réglable dont la sortie débite dans le primaire 17a d'un transformateur de sortie 17. Le secondaire du transformateur 17 ali¬ mente le ou les pistolets d'induction 5. Le transfor- mateur 17 assure l'adaptation d'impédance requise. En parallèle sur l'enroulement secondaire 17b du trans¬ formateur 17 est connecté un condensateur 18 dont la capacité forme un circuit résonnant avec l'inductance de l'enroulement de manière que l'énergie appliquée au pistolet 5 soit délivrée sous forme de pointes de tension de grande intensité. Le rectangle noté 19 re¬ présente un circuit de réglage pour l'oscillateur 15.The generator 10 comprises an oscillator 15 for generating variable voltages at medium or high frequency (for example a few tens of kilohertz). The output of the oscillator 15 is amplified in a power amplifier 16 with adjustable gain, the output of which flows into the primary 17a of an output transformer 17. The secondary of the transformer 17 feeds the gun (s) induction 5. The transformer 17 provides the required impedance matching. In parallel on the secondary winding 17b of the transformer 17 is connected a capacitor 18 whose capacity forms a resonant circuit with the inductance of the winding so that the energy applied to the gun 5 is delivered in the form of spikes. high intensity voltage. The rectangle denoted 19 re¬ presents an adjustment circuit for the oscillator 15.
L'appareil selon l'invention se complète avantageuse- ment de dispositifs de commande et de contrôle élec¬ troniques. Par exemple, un système de régulation auto¬ matique de la puissance délivrée par l'oscillateur 15 afin de maintenir la température à la surface des éléments à assembler à une valeur prédéterminée. Un tel système de régulation, représenté par le rectangle identifié par le nombre 22, compare la température me¬ surée par un élément de mesure de température tel que représenté en 12 dans la tête d'induction 7 à une valeur de consigne prédéterminée et produit un signal de réglage de l'oscillateur 15 en fonction de l'écart de température mesuré. Un programmateur 23 peut égale¬ ment être prévu pour commander automatiquement le cycle de chauffage suivant un programme préétabli. Le programmateur 23 produit des signaux de commande pour l'oscillateur en vue de fixer les temps de chauffe et les temps de coupure. Les boutons-poussoirs 24 permet¬ tent le réglage manuel du programmateur.The apparatus according to the invention is advantageously supplemented with electronic command and control devices. For example, an automatic regulation system of the power delivered by the oscillator 15 in order to maintain the temperature on the surface of the elements to be assembled at a predetermined value. Such a regulation system, represented by the rectangle identified by the number 22, compares the temperature measured by a temperature measuring element as shown at 12 in the induction head 7 to a predetermined set value and produces a signal for adjusting the oscillator 15 as a function of the measured temperature difference. A programmer 23 can also be provided to automatically control the heating cycle according to a preset program. The programmer 23 produces control signals for the oscillator in order to fix the heating times and the breaking times. The push buttons 24 allow manual setting of the programmer.
Un temporisateur 25 peut également être prévu pour fixer le temps de maintien de la pression P sur les pièces à assembler. Un tel temporisateur 25 se trouve par exemple enclenché par la fermeture d'un contact 27 logé dans le corps 6 du pistolet 5. Le temps de main¬ tien de la pression pendant la phase de chauffage et pendant la phase de refroidissement est en effet im¬ portant pour assurer l'accrochage parfait des éléments à assembler et du produit de liaison. Le temporisateur 25 commande également une électrovanne 28 pour l'envoi d'air comprimé dans le tuyau 21 pour refroidir le corps 6 du pistolet d'induction 5. L'ensemble de ces dispositifs complémentaires, sans être absolument indispensables à la réalisation d'un accrochage local entre les éléments 1, 3 et 2, en fa¬ cilite largement la réalisation pratique car il permet la fixation et le contrôle des différents paramètres nécessaires à la réalisation d'un joint de caractéris¬ tiques mécaniques convenables qui satisfasse au critè¬ re de non détérioration du revêtement des tôles .A timer 25 can also be provided to fix the time for maintaining the pressure P on the parts to be assembled. Such a timer 25 is, for example, triggered by the closing of a contact 27 housed in the body 6 of the gun 5. The time for maintaining the pressure during the heating phase and during the cooling phase is indeed im ¬ bearing to ensure perfect attachment of the elements to be assembled and the bonding product. The timer 25 also controls a solenoid valve 28 for sending compressed air into the pipe 21 to cool the body 6 of the induction gun 5. All of these complementary devices, without being absolutely essential for achieving a local attachment between the elements 1, 3 and 2, greatly facilitates practical realization because it allows the fixing and the control of the various parameters necessary for the production of a seal of suitable mechanical characteristics which satisfies the criterion of non-deterioration of the coating of the sheets.
La mise en oeuvre de l'appareil selon l'invention est simple. Le pistolet d'induction 5 est fixé par un moyen quelconque sur un manipulateur destiné à dépla¬ cer le pistolet verticalement, tête d'induction vers le bas. La zone de recouvrement des deux éléments à assembler 1 et 2 avec un cordon de produit de liaison 3 entre eux est amené sous le pistolet d'induction 5 (figure 1). Le générateur est mis en marche, le régla¬ ge du temps de chauffage est éventuellement ajusté et le manipulateur est mis en fonctionnement. Le manipu- lateur positionne le pistolet d'induction 5 avec sa tête contre la pièce 2 et applique une force de pres¬ sion verticale P prédéterminée pendant un intervalle de temps prédéterminé tandis que le solenoïde 13 est excité par un courant produit par le générateur. Le flux magnétique produit traverse la pièce 2 et le cordon de produit de liaison 3 puis se ferme dans la pièce 1, la chaleur induite dans le produit de liaison y créant localement une accélération thermique de la polymérisation. Le temps d'induction est par exemple de l'ordre de 5 à 10 secondes pour assembler des pièces en tôles d'acier prérevêtues de 0,7 à 1 mm d'épaisseur suivant la nature du revêtement et l'épaisseur des tôles mises en oeuvre. Le temps d'in¬ duction est suffisant pour accélérer la polymérisation du produit de liaison. Après un laps de temps prédéterminé, suffisant pour que soit réalisé l'accrochage du produit de liaison et des éléments à assembler (par exemple quelques secon¬ des), le manipulateur écarte le pistolet d'induction 5 de la pièce 2 et les pièces 1 et 2 sont déplacées pour permettre la réalisation d'un autre point de collage. Le manipulateur positionne à nouveau le pistolet d'in¬ duction contre la pièce 2 pour un nouveau cycle pres¬ sion/induction et le processus est répété pour chaque point de collage prévu.The implementation of the apparatus according to the invention is simple. The induction gun 5 is fixed by any means on a manipulator intended to move the gun vertically, induction head down. The overlap area of the two elements to be assembled 1 and 2 with a bead of bonding product 3 between them is brought under the induction gun 5 (FIG. 1). The generator is started, the heating time setting is possibly adjusted and the manipulator is put into operation. The manipulator positions the induction gun 5 with his head against the part 2 and applies a predetermined vertical pressure force P for a predetermined period of time while the solenoid 13 is excited by a current produced by the generator. The magnetic flux produced crosses the part 2 and the bead of bonding product 3 then closes in the part 1, the heat induced in the bonding product locally creating a thermal acceleration of the polymerization. The induction time is for example of the order of 5 to 10 seconds to assemble parts of pre-coated steel sheets 0.7 to 1 mm thick depending on the nature of the coating and the thickness of the sheets put artwork. The induction time is sufficient to accelerate the polymerization of the binding product. After a predetermined period of time, sufficient for the attachment of the bonding product and the elements to be assembled (for example a few seconds) to be carried out, the manipulator dismisses the induction gun 5 from the part 2 and the parts 1 and 2 are moved to allow the realization of another bonding point. The manipulator again positions the induction gun against the part 2 for a new pressure / induction cycle and the process is repeated for each planned bonding point.
Le nombre de points de collage dépend de la longueur et de l'usage de l'ensemble à réaliser. Par point de collage on entend ici une zone d'accrochage de faible superficie, par exemple une zone de l'ordre de 20 à 50 mm2 selon l'application. Les points de collage prévus ayant été réalisés, la poursuite de polymérisa¬ tion du cordon de produit de liaison peut ensuite se faire soit par polymérisation naturelle à partir des- dits points polymérisés de façon accélérée, soit par une opération thermique ultérieure généralement déjà insérée dans une chaîne de fabrication.The number of bonding points depends on the length and the use of the assembly to be made. By bonding point here is meant a small area of attachment, for example an area of the order of 20 to 50 mm 2 depending on the application. As the planned bonding points have been made, the polymerization of the bead of bonding product can then be carried out either by natural polymerization from said accelerated polymerized points, or by a subsequent thermal operation generally already inserted in a production line.
Dans le cas de l'utilisation d'une colle structurale, l'accrochage est un accrochage chimique entre le revê¬ tement des pièces à assembler et la colle par polymé¬ risation de cette dernière. Le chauffage par induction dans ce cas sert à accélérer la polymérisation de la colle.In the case of the use of a structural adhesive, the attachment is a chemical attachment between the coating of the parts to be assembled and the adhesive by polymerization of the latter. Induction heating in this case serves to accelerate the polymerization of the adhesive.
Lorsque l'on utilise une brasure comme produit de liaison, l'analyse de micrographies a révélé que l'ac¬ crochage réside dans un phénomène chimique parti¬ culier de liaison. Avec une brasure zinc-cadmium appliquée à des tôles galvanisées, ce phénomène se dé¬ compose en deux phases : 1° ) une diffusion du cadmium qui s'effectue à l'état solide dans la couche protec¬ trice à base de zinc des tôles, cette diffusion à l'état solide réalisant un alliage cadmium-zinc à la surface en contact entre chaque couche protectrice et la brasure, et 2e) une fusion de l'alliage superficiel et de la brasure qui réalise, après solidification, une liaison métallique assurant un accrochage entre les tôles.When a solder is used as a bonding product, the analysis of micrographs has revealed that the adhesion lies in a particular chemical phenomenon of bonding. With a zinc-cadmium brazing applied to galvanized sheets, this phenomenon is divided into two phases: 1) diffusion of the cadmium which takes place in the solid state in the zinc-based protective layer of the sheets, this diffusion in the solid state producing a cadmium-zinc alloy at the surface in contact between each protective layer and the solder, and 2 e ) a fusion of the surface alloy and of the solder which, after solidification, produces a metallic bond ensuring a bonding between the sheets.
Le dispositif selon l'invention permet le collage par points de deux éléments, même lorsque l'un d'eux ou les deux sont des pièces prérevêtues, par exemple une tôle prépeinte. C'est ainsi que l'on a réalisé avec succès la fixation de raidisseurs métalliques trans- versaux sur des panneaux de portes métalliques , la fixation d'une contreporte en matière plastique thermoformable sur une porte en tôle prépeinte, et la fixation d'un revêtement en téflon sur une pièce métallique prépeinte pour citer quelques réalisations exemplaires.The device according to the invention allows the bonding by points of two elements, even when one or both of them are pre-coated parts, for example a prepainted sheet. This is how we have successfully carried out the fixing of transverse metal stiffeners on metal door panels, the fixing of a thermoformable plastic door against a prepainted metal door, and the fixing of a Teflon coating on a prepainted metal part to cite some exemplary achievements.
Outre l'avantage de permettre d'appliquer le procédé de collage à des tôles prérevêtues , et en particulier à des tôles prépeintes, ainsi qu'il a été souligné plus haut, l'appareil suivant l'invention permet une vitesse d'assemblage élevée, ce qui rend possible de l'intégrer avec profit dans une ligne de fabrication industrielle.In addition to the advantage of making it possible to apply the bonding process to pre-coated sheets, and in particular to prepainted sheets, as has been pointed out above, the apparatus according to the invention allows a high assembly speed. , which makes it possible to integrate it profitably into an industrial manufacturing line.
Le mode de réalisation de l'invention décrit dans ce qui précède est un exemple donné à titre illustratif et l'invention n'est nullement limitée à cet exemple. Toute modification, toute variante et tout agencement équivalent doivent être considérés comme compris dans le cadre de l'invention. The embodiment of the invention described in the foregoing is an example given by way of illustration and the invention is in no way limited to this example. Any modification, any variant and any equivalent arrangement must be considered to be within the scope of the invention.

Claims

REVENDICATIONS
1. Appareil de chauffage par induction destiné en particulier à réaliser un collage par points de deux éléments, comprenant : au moins un pistolet d'induction (5) constitué d'un boîtier rigide (6,7) capable de transmettre un effort de pression qui lui est appliqué, le boîtier contenant un solenoïde (13) enroulé autour d'un noyau en ferrite à haute perméabilité (12), le solenoïde étant relié aux bornes d'un circuit résonnant LC (17-18) connecté à la sortie d'un générateur de signaux électriques à moyenne ou haute fréquence ( 10 ) pour alimenter le so¬ lenoïde en courant électrique sous forme de pointes d'énergie de manière à produire dans le noyau de ferrite (14) des flux magnétiques intenses de courte durée prédéterminée, le noyau de ferrite à haute perméabilité ayant une forme en U, les branches verticales du profil en U s 'étendant perpendiculairement à la face (8) du boî¬ tier (6) destinée à venir en contact avec un des éléments à assembler, l'ecartement entre les branches verticales du profil en U déterminant l'étendue longi¬ tudinale d'un point de collage.1. Induction heating device intended in particular to achieve a point bonding of two elements, comprising: at least one induction gun (5) consisting of a rigid housing (6,7) capable of transmitting a pressure force applied to it, the housing containing a solenoid (13) wound around a high permeability ferrite core (12), the solenoid being connected to the terminals of an LC resonant circuit (17-18) connected to the output d 'a generator of electrical signals at medium or high frequency (10) for supplying the so¬ lenoid with electric current in the form of energy peaks so as to produce in the ferrite core (14) intense magnetic fluxes of predetermined short duration , the high permeability ferrite core having a U-shape, the vertical branches of the U-profile extending perpendicular to the face (8) of the housing (6) intended to come into contact with one of the elements to be assembled, the spacing between the vertical branches s of the U-shaped profile determining the longitudinal extent of a bonding point.
2. Appareil selon la revendication 1, caractérisé en ce que le boîtier (6) du pistolet d'induction (5) est prévu pour être fixé sur un manipulateur servant à positionner la base (8) du pistolet d'induction contre un (2) des éléments à assembler, avec un effort de pression (P), le manipulateur comprenant un moyen de commande agencé pour maintenir le pistolet d'induction (5) en état de pression contre ledit élément (2) pendant un intervalle de temps prédéterminé. 2. Apparatus according to claim 1, characterized in that the housing (6) of the induction gun (5) is designed to be fixed on a manipulator serving to position the base (8) of the induction gun against a (2 ) of the elements to be assembled, with a pressure force (P), the manipulator comprising a control means arranged to maintain the induction gun (5) in a state of pressure against said element (2) for a predetermined time interval.
3. Appareil selon la revendication 2, caractérisé en ce que le boîtier (6) du pistolet d'induction (5) contient un commutateur (25) monté pour transmettre un signal de commande lorsque le pistolet d'induction se trouve en contact avec un (2) des éléments à assem¬ bler, ledit signal de commande servant à faire dé¬ marrer un temporisateur (24) agencé pour fixer le temps de maintien de la pression (P) sur les éléments à assembler.3. Apparatus according to claim 2, characterized in that the housing (6) of the induction gun (5) contains a switch (25) mounted to transmit a control signal when the induction gun is in contact with a (2) of the elements to be assembled, said control signal serving to start a timer (24) arranged to fix the time for maintaining the pressure (P) on the elements to be assembled.
4. Appareil selon la revendication 1, 2 ou 3, caracté¬ risé en ce que le condensateur (18) faisant partie du circuit résonnant du générateur est logé dans le boî¬ tier (6) du pistolet d'induction (5).4. Apparatus according to claim 1, 2 or 3, caracté¬ ized in that the capacitor (18) forming part of the resonant circuit of the generator is housed in the boî¬ tier (6) of the induction gun (5).
5. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend un moyen de refroidissement pour amener un flux de gaz de re¬ froidissement dans le boîtier (6) du pistolet d'induc- tion (5).5. Apparatus according to any one of the preceding claims, characterized in that it comprises a cooling means for bringing a flow of cooling gas into the housing (6) of the induction gun (5).
6. Procédé de collage par points de deux éléments, caractérisé par les étapes suivantes : entre les deux éléments (1,2) est étendu un cordon de produit de liaison ( 3 ) ; l'ensemble (1,3,2) est maintenu en dessous d'au moins un pistolet d'induction (5) fixé sur un manipulateur; le manipulateur est commandé pour déplacer le pistolet d'induction (5) et le positionner contre un (2) des éléments à assembler en y appliquant un effort de pression (P) pendant un intervalle de temps prédéter¬ miné tandis que le pistolet d'induction (5) est ali¬ menté afin de produire un flux d'induction magnétique; le manipulateur est commandé pour écarter le pistolet d'induction (5) de l'ensemble assemblé après l'expira¬ tion dudit intervalle de temps prédéterminé; l'ensemble (1,3,2) est déplacé longitudinalement d'une longueur prédéterminée afin de présenter sous le pis¬ tolet d'induction (5) la position d'un autre point de collage; et les manipulations du pistolet d'induction et des élé¬ ments sont répétées pour chaque point de collage pré¬ vu.6. A method of point bonding of two elements, characterized by the following steps: between the two elements (1,2) is extended a bead of bonding product (3); the assembly (1,3,2) is held below at least one induction gun (5) fixed on a manipulator; the manipulator is controlled to move the induction gun (5) and position it against one (2) of the elements to be assembled by applying a pressure force (P) to it during a predetermined time interval while the spray gun induction (5) is supplied in order to produce a magnetic induction flux; the manipulator is controlled to separate the induction gun (5) from the assembled assembly after the expiration of said predetermined time interval; the assembly (1,3,2) is moved longitudinally by a predetermined length in order to present under the induction pis¬ tolet (5) the position of another bonding point; and the manipulations of the induction gun and of the elements are repeated for each gluing point provided.
7. Procédé selon la revendication 6, dans lequel le pistolet d'induction (5) comprend un inducteur (11) constitué d'un solenoïde (13) enroulé sur un noyau (14) en ferrite à haute perméabilité.7. The method of claim 6, wherein the induction gun (5) comprises an inductor (11) consisting of a solenoid (13) wound on a core (14) of high permeability ferrite.
8. Procédé selon la revendication 6 ou 7, caractérisé en ce que le boîtier (6) du pistolet d'induction (5) contient un commutateur (25) monté pour transmettre un signal de commande lorsque le pistolet d'induction se trouve en contact avec pression sur les éléments à assembler, ledit signal de commande servant à faire démarrer un temporisateur (24) agencé pour fixer le temps de maintien de la pression sur les éléments à assembler.8. Method according to claim 6 or 7, characterized in that the housing (6) of the induction gun (5) contains a switch (25) mounted for transmitting a control signal when the induction gun is in contact with pressure on the elements to be assembled, said control signal serving to start a timer (24) arranged to fix the time for maintaining the pressure on the elements to be assembled.
9. Pocédé selon la revendication 6, 7 ou 8, caractéri- se en ce que le condensateur (18) faisant partie du circuit résonnant est logé dans le boîtier ( 6 ) du pistolet d'induction (5).9. Process according to claim 6, 7 or 8, characterized in that the capacitor (18) forming part of the resonant circuit is housed in the housing (6) of the induction gun (5).
10. Procédé selon l'une quelconque des revendications 6 à 9, caractérisé en ce que le boîtier du pistolet d'induction (5) est refroidi. 10. Method according to any one of claims 6 to 9, characterized in that the housing of the induction gun (5) is cooled.
PCT/BE1988/000034 1988-12-23 1988-12-23 Punctual glueing process and inductive heating apparatus for implementing said process WO1990007419A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/BE1988/000034 WO1990007419A1 (en) 1988-12-23 1988-12-23 Punctual glueing process and inductive heating apparatus for implementing said process
EP89900567A EP0449806A1 (en) 1988-12-23 1988-12-23 Punctual glueing process and inductive heating apparatus for implementing said process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (2)

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WO1995017079A1 (en) * 1993-12-14 1995-06-22 Essex Specialty Products, Inc. Apparatus for heating substrate having electrically-conductive metallic and non-electrically-conductive portions
WO1999014030A1 (en) * 1997-09-17 1999-03-25 Mirical Emblems Ltd. Method and apparatus for controlling heat bonding

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EP0080083A2 (en) * 1981-11-20 1983-06-01 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Process and apparatus for glueing together, on a large scale, thin-walled construction elements
DE8509352U1 (en) * 1985-03-28 1985-08-08 Automation Industrielle S.A., Vouvry HF welding equipment
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FR1214255A (en) * 1958-12-19 1960-04-07 Automatic machine for welding transverse walls to metal tubular bodies
FR74745E (en) * 1958-12-19 1961-01-16 Automatic machine for welding transverse walls to metal tubular bodies
GB957385A (en) * 1961-04-18 1964-05-06 Ford Motor Co Method of bonding a heat conducting portion to a glass portion
US4120712A (en) * 1975-03-17 1978-10-17 The Boeing Company Method of securing two non-metal surfaces together using a hot melt type fastener heatable by induction heating
EP0079690A1 (en) * 1981-10-26 1983-05-25 Toyo Seikan Kaisha Limited Apparatus for producing metal vessels
EP0080083A2 (en) * 1981-11-20 1983-06-01 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Process and apparatus for glueing together, on a large scale, thin-walled construction elements
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995017079A1 (en) * 1993-12-14 1995-06-22 Essex Specialty Products, Inc. Apparatus for heating substrate having electrically-conductive metallic and non-electrically-conductive portions
WO1999014030A1 (en) * 1997-09-17 1999-03-25 Mirical Emblems Ltd. Method and apparatus for controlling heat bonding

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