WO1985001896A1

WO1985001896A1 - Stamping machine and set of tools for stamping machines

Info

Publication number: WO1985001896A1
Application number: PCT/DE1984/000229
Authority: WO
Inventors: Ferdinand Dietz
Original assignee: Dietz Nc-Werkzeugsysteme
Priority date: 1983-10-31
Filing date: 1984-10-30
Publication date: 1985-05-09
Also published as: EP0140373A2; DE3339503A1; EP0140373A3; EP0140373B1; ATE42699T1; DE3477998D1; DE3339503C2

Abstract

Stamping machine with a series of tools having each a matrix and, at a certain interval, a stamp which is displaceable in a guiding sleeve. The guiding sleeves are plugged in interchangeably in a guiding plate. To each tool there is adjoined an engageable and disengageable coupling device used to transfer the desired stamping force to the corresponding stamp. Set of tools from said tools, to be provided in a stamping machine, a plurality of tools and a plurality of coupling devices being joined together to form a single structural unit.

Description

Punching machine and tool set for punching machines

The invention relates to a punching machine with a feed device for the cyclical further movement of the material to be punched through the punching machine, with a series of tool elements, each of which has a die arranged in a die holder and a guide for a punch punch arranged at a distance above it, and with a the stamping head plate of the drive device.

A punching machine of this type is known from the magazine "Bands, sheets, tubes" (1976), pages 448 to 450. In this known punching machine, the tool elements are each C-shaped and individually attached to a table of the punching machine. With each downward movement of the head plate under the action of the drive device of the punching machine, all of the punching dies provided are simultaneously moved toward the material to be punched and the dies, so that they all perform a (punching) cut at the same time. The punching machine works according to the principle of the follow-up cut, in which the material to be punched is moved through the punching machine intermittently between the punching strokes, a series of identical punchings or identical punching patterns being punched one after the other and a specific workpiece to be punched several identical punchings or punching patterns one after the other having. This limits working with the punching machine to the production of workpieces whose overall punching pattern can be divided into a number of identical individual punching patterns. If, on the other hand, a workpiece, for example, has a certain punch opening only once, this punch opening must be punched subsequently. The object of the invention is to create a punching machine which is as universal as possible and which, in particular, should also be able to punch quickly and with high precision workpieces which have an overall punching pattern which cannot be subdivided into identical individual punching patterns.

To achieve this object, the punching machine according to the invention is characterized in that the guide of the punch is given by a respective guide sleeve which is interchangeably inserted in a guide plate arranged at a distance above the die and in which the punch is slidable is guided, and that the tool elements each have a coupling device that can be switched on and off that is used to selectively transmit the force to the assigned punch.

In the punching machine according to the invention, the guide sleeves with punch stamp and the dies can be exchanged extremely easily or removed or inserted according to the respective punching task and one or more punch punches can be switched off from a provided punch punch arrangement with each punch stroke so that he or she does not perform any punching. This enables a quick change to other punching patterns. The punching machine according to the invention can operate according to the follow-up cutting principle or the complete cutting principle. In the case of punchings according to the follow-up cutting principle, the individual cuts of the cut sequence can, if necessary, be carried out with punching dies switched on and off differently, which considerably expands the spectrum of parts which can be produced according to the follow-up cutting principle. However, the punching machine according to the invention also rationalizes punching according to the complete cutting principle, because with a single row of tool elements, each of which has a punch with an associated die, a larger number of different ones

_ OMPI Parts can be punched if other punching dies are switched on and off depending on the part to be punched, and because new tool sets can be quickly assembled by simply replacing, removing or adding guide sleeves with punching die and die. Overall, the production of parts that are similar to one another, so-called part families, is also significantly simplified, as will be explained in more detail below. The cutting off of the respectively punched part from the material to be punched which is fed as a continuous band can also be integrated into the function of the punching machine according to the invention by providing a punching punch which acts as a severing punch and which is only switched on at the end of the sequence of the individual punchings becomes. The punching machine according to the invention can be built much lighter and smaller than conventional punching machine in terms of the installed drive power, since these had to be designed for maximum occupancy, that is to say the use of the entire machine length in the direction of material movement for the use of punching stamps and the resulting forces and required power.

Preferred developments of the punching machine according to the invention result from claims 2 to 5. The intermediate pieces of the coupling devices are preferably pneumatically, hydraulically, mechanically or electromagnetically displaceable. The tool element assembly and / or the coupling device assembly are preferably all interchangeable.

A switchable coupling device is advantageously provided for each punch that can be switched on and off, although it is also possible to provide for punching dies to be switched on and off in groups. Conveniently, all punch stamps of the intended punch stamp arrangement can be switched on and off. The invention further relates to a tool set for installation in an existing press, which has a die arranged in a die holder and, at a distance above it, has a tool guide for a punch, the guide being a guide sleeve which can be exchanged in a guide plate is inserted and axially displaceable against spring action, and wherein the

Punching stamp is axially displaceable in the guide sleeve against spring action. Such a tool set consisting of a punch and a die is known from DE-OS 25 38 605.

In contrast, the tool set according to the invention is characterized in that the tool set is assigned a coupling device which can be switched on and off and which serves for the optional transfer of the punching force to the punch, that a number of the guide sleeves, punch and dies are combined to form a structural unit are in which a lower part extending over its length forms the receptacles for the matrices and an upper part extending over its length and arranged at a distance above it forms the guide plate for the guide sleeves, and that a number of coupling devices are also separate is combined into a structural unit. This also realizes advantages of the type mentioned above.

If the above has been referred to as punching dies, punching force or the like, then this should not only refer to punching processes, that is to say cutting processes, in the narrower sense. These terms are rather well vergleich¬ cash transactions, such as embossing, beading, with partial Schnei¬ the associated bending of material areas and the like., And take ^'. The punching machine according to the invention is preferably electronically controlled, in particular CNC-controlled (computerized numerical control). This control can take over the switching on and off of the individual punches or the drive of the individual punches and, if necessary, the feed device. The control is advantageously carried out by means of an integrated, program-controlled computer, to which the data for the workpiece to be produced are fed. The reaching of the top and bottom dead center of the punch stroke can be detected by sensors, the respective punch stamps being switched on after top dead center and being switched off after bottom dead center. In addition, a check can be carried out, for example, by means of a sensor as to whether punching waste comes from all of the punching dies that are switched on, the punching machine automatically switching off in the event of faults which do not produce any punching waste. The punching machine according to the invention can be fully automated and, as a result, can also be operated without operating personnel, for example at night. The control can be programmed, for example, via a keypad, via punched tape or via an information carrier cassette.

OMPI_ The invention and further developments of the invention are explained in more detail below on the basis of partially schematically illustrated exemplary embodiments. Show it:

1 is a view of the punching stamp area of a punching machine, the viewing direction being transverse to the longitudinal direction of the punching machine;

FIG. 2 shows a vertical section on a larger scale through a tool element of the punching machine according to FIG. 1;

3 shows a longitudinal section on an enlarged scale of a part of the tool element from FIG. 2, as well as top views of a die holder and a die cutting insert;

4 shows a family of parts that can be produced with the punching machine according to the invention;

5 shows a modified embodiment of the punching machine according to the invention with a turret plate.

1 shows a head plate 2 and a machine table 38 of a punching machine. The head plate 2 can be moved along guide columns 6 onto the machine table 38 by means of a drive device (not shown), for example in the form of a hydraulic punch stroke drive. On the machine table 38 there is a lower part 44 and at a distance above an upper part 46, the lower part 44 and the upper part 46 being able to pass over the entire length of the machine table 38, can be divided into shorter sections or can also be divided per tool element 42 can form its own part. The head plate 2, which in the exemplary embodiment shown has the shape of a bar extending in the longitudinal direction of the punching machine, extends above the row of tool elements 42. To carry out the punching movement, the head plate is moved downward and acts on one, several or all Tool elements 42 with punching force.

From Fig. 2 the details of a tool element 42 and its punching force can be seen more in detail. The tool element 42 shown consists essentially of a die holder 24 arranged on the lower part 44 with a die designed as an inserted cutting insert 26, a punching die unit 48 inserted into the top part 46 from above, which can be displaced downward towards the die against the action of springs 50, and a coupling device attached to the bottom of the head plate 2. The coupling device essentially consists of a vertical blind bore 54 which is open at the bottom and has a plunger 56 which is arranged to be vertically displaceable therein is displaceable to the left and back and is used to switch the plunger 56 on and off. Below the cutting insert 26, an opening 40 is provided in the lower part and in the machine table 38 for removing the punching waste.

In the illustrated passive position of the intermediate piece 34, there is free space in the blind bore 54 above the tappet 56, so that when the head plate 2 moves downward, the tappet 56 is initially carried downward because of the friction in the blind bore 54, but then with a further downward movement of the head plate 2 receives no punching force from above, but without punching force transmission

ΓRK; remains on the top of the punching die unit 48. If the plunger 56 is switched on by moving the intermediate piece 34 to the left and the head plate 2 is lowered to carry out a punching movement, then the plunger 56 presses on the punching stamp unit 48 and presses it down against the action of the springs 50. The lower end face 52 of the punch unit 48 acts as a hold-down device. In the punch unit 48 a Stanz¬ ^'is arranged punch 18 vertically movable relative to, FIG. 3 shows a possible embodiment therefor. The punch 18 passes through the cutting insert 26 upon further downward movement of the head plate 2 and carries out the actual punching.

If a strip of material to be punched is fed in cycles in the longitudinal direction of the punching machine through the space between the upper part 46 and the die holder 24, the individual punching stamps 18 can be switched on and off as required by a CNC control. For example, For each punch stroke, an identical recess can be punched next to the other, while certain holes in the workpiece, for example, are only punched once after a certain number of recesses and a separating cutting punch only once at the end of the workpiece with the punched row of recesses is operated.

The tool elements 42 or the stamping dies 18 do not have to be arranged in a straight line, but the stamping stamps 18 can also — viewed in the viewing direction of FIG. 1 — be arranged partly behind and partly in front of the drawing plane. It is also possible to provide a plurality of switchable punching dies 8 in one plane transverse to the longitudinal extent of the punching machine. A group of several dies 26, punching stamp units 48 and coupling devices can also be combined as a structural unit or tool set. In addition, it is possible to attach a group of several coupling devices as a structural unit under the top plate 2, even if the dies 26 and punching units 48 are used individually. The stamping unit 48 is inserted in the simplest way from above into a corresponding hole in the upper part 46. The same applies to the die 26. The tool elements 42 can be provided not only in one row in the longitudinal direction of the punching machine, but also in several rows one behind the other, as seen in the viewing direction of FIG. 1. A punching machine is therefore in front of one another Individual tool elements 42 or groups of tool elements 42 can be arranged at a selectable position on the punching machine, adapted to the respective punching task. The tool elements 42 are also ideal for retrofitting existing punching machines.

In Fig. 3, a preferred embodiment for a stamping stamp unit 48 ^{'is shown in} more detail. An upper tool head 58, a lower guide sleeve 60 and a spring element 62 arranged between them can be seen. A concentric one from above

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OMPI l.λ WIPO, Λ »J ^ ** AT1 A stamping punch holder 64 is arranged to pass through the interior space of these parts 58, 60, 62 and to which the actual punching stamp 18 of smaller diameter is attached below. The stamping stamp unit 48 is designed in a manner lubricated from the inside by an oil supply channel 66, the lubricating oil reaching down to the cutting stamp 18 and its passage through the lower end of the guide sleeve 60. If the plunger 56 (FIGS. 1 and 2) is pressed onto the respective tool head 58 while the head plate 2 is moving downward, the entire punching stamp unit 48 initially moves downward until its lower end face acts as a hold-down device on the to punching material. The further downward movement of the head plate 2 causes the respective spring element 62 to be compressed and thereby the actual punch 18 to emerge from the bottom of the punch unit 48 through the associated die 26.

The die 26 shown in FIG. 3 is a cutting insert in a so-called one-way design, which is therefore not re-sharpened but rather replaced when it becomes blunt. The cutting punch receptacle 24 has, at the top, a circular recess 70, seen from above, but provided with a straightening 68. The cutting insert 26 provided with a corresponding circumferential contour is inserted into this from above and fastened with small screws. The cutting insert 26 contains the actual die cutting opening 28. The straightening 68 ensures that the cutting insert 26 is in a precise position.

Fig. 4 shows a simple example of a so-called family of parts from the switch housing construction. Such families of parts, also of a much more complicated type, can be created with one designed according to the invention

OMPI ^ Manufacture punching machine particularly efficiently.

4a) shows the simplest part of the family of parts, in which there are seven large punched recesses 72 arranged at an identical distance and a smaller punched recess 74 between them. To produce this part 76, two punch punches 18 will be provided in the longitudinal direction "adjacent to the punching machine, one for punching a larger recess 72 and the other for punching a smaller recess 74. Both punch punches are each moved around after the part 76 is advanced Feed length a is actuated at the same time, and only for cutting off the finished part 76 of the band-shaped punching raw material could a cutting punch be provided which is only switched on once after seven punching strokes.

The part 78 according to FIG. 4b) differs from the part 76 in that it has a shorter length and in that an elongated recess shape 74 * has to be punched in part of the smaller recesses 74. Here, for example, in the longitudinal direction of the punching machine, at a distance from the two punching dies described above, an additional punching die can be provided which punches the extensions of the recesses 74 '. This additional punch is to be controlled so that it does not in any Stanzbe¬ the punching machine performs motion, but only where this is dictated by the program control of the punching machine. The ^'stamping Otherwise this additional punch remains switched off. In addition, the separating cutting punch is to be controlled in such a way that a part 78 with five recesses 72 is cut off.

The part 80 according to FIG. 4c) differs from the parts 76 and 78 in that the larger recesses 72 have a smaller mutual center distance a, that the smaller recesses 74 '* are smaller than before, that 72 holes 82 are to be punched in some of the sheet-metal tabs between the recesses and that a special recess 84 is to be stamped with a different shape at the beginning of part 80 . With regard to the recesses 72 and 74 * ', one will proceed here analogously to part 76. A separate punch is provided for the holes 82 and the separate recess 84, analogously to that described in connection with FIG. 4b) for the extension of the smaller recesses 74 '. The additional punches are controlled to be switched on when a hole 82 or a recess 84 is to be punched.

5 shows a plan view of a turret plate 90 which can be used in the punching machine according to the invention. The turret plate 90 has an essentially octagonal shape with rounded corners and can be rotated about its vertical axis of rotation 92 in steps of 90 ° or 45 °. A total of 14 through bores 94 are distributed over the circumference of the turret 90 such that, at least in part of the stepping positions of the turret 90, a plurality of bores 94 are arranged along a straight line 96 in the longitudinal direction of the punching machine. At a distance below the turret plate 90 is another, similar turret plate, not visible in FIG. 5. These two turret heads can be switched together in steps. The lower turret plate rests on the machine table 38, but can rotate on it in a rotationally sliding manner when it is indexed.

The bores 94 serve for the insertion of punching stamp units 48 in the same manner as shown in FIG. 2. On the lower, not visible turret plate, die receptacles 24 and dies 26 are arranged in the same way in the same way as shown in FIG. 2. By rotating the turret 90 together with the underneath, not visible turret, other tool elements 42 can thus be brought into a position in which they can be acted upon by the head plate 2 with punching force, whereby in turn individual punching dies can be switched off.

Claims

Expectations

1. Punching machine with feed device for the clockwise further movement of the material to be punched through the punching machine, with a series of tool elements (42), each of which has a die (26) arranged in a die holder (24) and a tool spaced above it have its own guide for a punch (18) and with a head plate (2) of the drive device which acts on the punch (18), characterized in that the guide of the punch (18) is in each case guided by a guide sleeve ( 60) is provided, which is interchangeably inserted into a guide plate (48) which is arranged at a distance above the die (26) and in which the punch (18) is slidably guided, and that the tool elements (42) each have a coupling device which can be switched on and off (-34, 36) is assigned, which serves for the optional transfer of the punching force to the assigned punch (18).

2. Punching machine according to claim 1, characterized in that the coupling device has an intermediate piece (34) which is arranged on the head plate (2) and between an active position in which the punching force from the head plate (2). Via the intermediate piece is exceeded on the associated punch (18) (34) _»carry, and a retracted passive position, in which the top plate (2) is movable without cutting power transmission to the punch (18) relative to the latter, is moved back and forth.

3. Punching machine according to claim 1, characterized in that several tool elements (42) are combined to form a structural unit.

4. Punching machine according to claim 1, characterized in that a plurality of coupling devices (34, 36) are combined to form a structural unit.

5. Punching machine according to claim 1, characterized in that the tool elements (42) are carried by a Revolver¬ plate (90).

6. Tool set for installation in an existing press, which has a die (26) arranged in a die holder (24) and, at a distance above it, a die set guide for a punch (18), a guide sleeve (60) being provided as the guide, which is interchangeably inserted in a guide plate (46) and axially displaceable against spring action, and wherein the punch (18) against spring action axially in the ^" guide sleeve (60) is displaceable, characterized in that the tool set is assigned a coupling device (34, 36) which can be switched on and off and which serves for the optional transfer of the punching force to the punch (18), that a number of the guide sleeves (60), punch (18) and dies ( 26) are combined into a structural unit in which a lower part (44) extending over their length forms the receptacles for the matrices (26) and an upper part extending over their length and arranged at a distance above the guide plate (46) for forms the guide sleeves (60), and that a number of coupling devices (34, 36) is also combined to form a structural unit.