CA2027877A1 - Device for the controlled and independent rocking of straightening and bending platforms - Google Patents

Device for the controlled and independent rocking of straightening and bending platforms

Info

Publication number
CA2027877A1
CA2027877A1 CA002027877A CA2027877A CA2027877A1 CA 2027877 A1 CA2027877 A1 CA 2027877A1 CA 002027877 A CA002027877 A CA 002027877A CA 2027877 A CA2027877 A CA 2027877A CA 2027877 A1 CA2027877 A1 CA 2027877A1
Authority
CA
Canada
Prior art keywords
platform
axis
straightening
bending
rotation
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
CA002027877A
Other languages
French (fr)
Inventor
Giorgio Del Fabro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MEP Macchine Elettroniche Piegatrici SpA
Original Assignee
MEP Macchine Elettroniche Piegatrici SpA
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 MEP Macchine Elettroniche Piegatrici SpA filed Critical MEP Macchine Elettroniche Piegatrici SpA
Publication of CA2027877A1 publication Critical patent/CA2027877A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/02Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
    • B21D3/05Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes rectangular to the path of the work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10Bending specially adapted to produce specific articles, e.g. leaf springs
    • B21D11/12Bending specially adapted to produce specific articles, e.g. leaf springs the articles being reinforcements for concrete
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21FWORKING OR PROCESSING OF METAL WIRE
    • B21F1/00Bending wire other than coiling; Straightening wire
    • B21F1/02Straightening

Abstract

ABSTRACT
Device for the controlled and independent rocking of a bending platform and straightening platform in bending-shaping machines having an independent bending platform (13) located downstream of a straightening platform (11), in which machines the straightening platform (11) has a preferred inclination, whereas the bending platform (13) has an inclination depending on the product being processed at that time, the axis of rotation (17) for adjustment of the inclination of the bending platform (13) being positioned below and at a distance "x" from the axis of the inlet (16) of rods (18) onto the bending platform (13), in which device the straightening platform (11) is supported on a parallelogram system (20) having the axis of lower pivots (26) distant by the value "x" from the axis of upper pivots (25), the axis of the lower pivots (26) coinciding with the axis (17) of rotation of the bending platform (13), whereas the axis of upper pivots (25) is kept so as to coincide substantially with the axis of the inlet (16) of rods (18).

Description

r~

1 "DEVICE FOR THE CONTROLLED AND INDEPENDENT ROCRING OF
2 STRAIGHTENING AND BENDING PLATFORMS"
3 * * * * * * *
4 This invention concerns a device for the controlled and independent rocking of strightening and bending platforms.
6 To be more exact, the invention is applied to machines 7 that form shaped iron rods for building work and, in 8 particular, shaped stirrup-type rods for the steel 9 reinforcement structures which are sunk in concrete to make reinforced concrete~
11 The bending-shaping machine according to the invention 12 comprises a straightening assembly upstream of a bending-13 shaping assembly which is of a type having a disk, central 14 contrast pin and offset beinding pin, for instance.
The bending-shaping machine to which the invention is 16 applied is arranged so that the straightening assembly and 17 bending-shaping assembly lie on independent platforms and 18 the platform of the bending-shaping assembly can be oriented 19 about a lengthwise axis which is substantially parallel to the axis of the passage of the rod to be bent and shaped and 21 is positioned below that latter axis so as to leave the 22 bending platform always free of anything which might 23 obstruct the rod being bent.
24 The bending platform is that which holds, and on which lies, the bending assembly and which supports the rod to be 26 bent and shaped during the passage and bending of the rod.
27 Instead, the straightening platform is that which holds 28 and supports the straightening assembly.
29 The rod which has to be bent and shaped may have a solid or hollow conformation and may have a smooth surface or have 31 superficial modifications. Its cross section may be oval, 32 round, three-lobed, quadrangular, etc.
33 The rod which has to be bend and shaped will come almost - 2 ~ 7 7 1 always from a reel, and the strai~hterling assembly will not 2 only have to straighten the rod passing through but will 3 also have to fix the twists which have been imparted to the 4 rod during winding onto and unwinding from a reel.
An example of such straightening is disclosed in the 6 document EP 87202107.6.
7 It should be borne in mind that rods being unwound from a 8 bundle formed in the hot state on a reel comprise coils 9 which have a difference in length between their inner and outer circumferences.
11 It is necessary to remember also that such bending-shaping 12 machinès can process rods of any size between diameters of 4 13 and 16 mm. or equivalent diameters.
14 In normal wound bundles having an average diameter of 1.2 metres a rod with a diameter of 16 mm. has a difference of 16 more than 5 cms. between the lengths of the outer and inner 17 circumferences of a coil.
18 This difference was not important in the past since the 19 reinforcement rods consisted usually of mild steel of the type FE 33, for instance, 21 With modern high-strength steels of the type FE 50 and 22 higher, for instance, the problems of the straightening and 23 behaviour of the rods upstream of the straightening assembly 24 have become very important for a successful outcome of the bending and shaping of the rod.
26 In the bending-shaping machines under discussion the 27 straight-ening platform on which the straightening assembly 28 lies is independent of the bending platform on which the 29 bending assembly lies and on which the bending and shaping and subsequent shearing of the rod are carried out.
31 In machines of this type and in bending-shaping machines 32 more generally the adjustment of the rollers of the 33 straightening assembly takes place automatically at the - 3 - 2~ 7 ~

1 beginning of each wound bundle of rod, and the processing of 2 the rod formlng the bundle proceeds by using the same wound 3 bundle as much as possible so as to be able to spread out 4 over the greatest possible number of pieces the downtimes due to preparation of the machine when the type of rod has 6 to be changed.
7 This means that during the processing of one wound bundle 8 stirrups shaped in different ways and of different sizes or 9 straight rods or bent rods of various types may be produced.
It also means that each type of stirrups or bent rod 11 requires a preferred angular position of the bending 12 platform.
13 Most of the shaped and bent pieces normally require the 14 bending platform to be inclined in relation to the lS horizontal by a value between 15 and 45, advantageously 16 about 30.
17 In other words, if the type of straight or bent rod or 18 stirrup to be produced is changed, the machine, within 19 certain values, changes its trim and, in particular, its trim in relation to the horizontal of the bending platform.
21 As we said above, the bending assembly carries the bending 22 action out as well as possible, in general and particular 23 terms, if it is positioned at a determined angle to the 24 horizontal.
This angle, which varies from 0 (horizontal platform) to 26 100/150 (inclined platform), depends on a plurality of 27 factors, and the machine manufacturers normally determine it 28 for each type or range of product during design work and 29 then admit a greater or smaller range of angles.
The present applicant has found that, given a determined 31 profile arriving from a given wound bundle, if the 32 positioning of the bending platform is changed in relation 33 to the horizontal, it is very advantageous that the 2 3,~ sJ ~

straightening platform should follow the bending platform so 2 as to keep the inlet of the rod to the bending platform 3 coaxial with the outlet of the rod from the straightening 4 platform.
S The present applicant has also fo~lnd that, if the 6 straightening platforrn has a preferred positioning in 7 relation to the horizontal and/or in relation to the axis of 8 unwinding of the rod from its reel, it is necessary that 9 this positioning should stay unchanged in relation to the horizontal, irrespective of the positioning taken on by the 11 bending platform.
12 The present applicant has found by trials that the 13 preferred positioning coincides with the positioning of the 14 straightening platform in a plane parallel to the plane of unwinding of the coils of rod from the wound bundle.
16 To avoid the problems linked to the depositing of the 17 calamine becoming detached from the rod during the 18 straightening operation, the present applicant has arranged 19 to position the straightening platform with the straightening assembly suspended below it, so that the 21 calamine falls automatically.
22 According to a variant, with regard to the obstructions 23 which the straightening platform may create for the rod 24 during bending, the present applicant has arranged to position the straightening platform according to a 26 positioning angle which the bending platform takes on in 27 most cases, namely at 25/30 to the horizontal and 28 therefore, in fact, to the plane of unwinding of the coils 29 of rod.
It was also found during trials conducted that the 31 positioning to be maintained by the straightening platform 32 should not create the positive or negative imparting of 33 auxiliary tensions during the positioning of the bending _ S ~ r~

1 platform, the purpose being to avoid the application of new 2 adjustments to the straightening assembly, for such 3 adjustments entail wasting of time which is less and less 4 acceptable with the required modern rates of output.
The present applicant has therefore designed, e~bodied and 6 tested this invention, which overcomes the problems cited 7 above and provides further advantages.
8 Thus, with a straightening assembly having its inlet and 9 outlet offset in relation to each other, the invention enables a correct reciprocal positioning to be obtained.
11 The invention also enables the positioning of the bending 12 platform to be modified easily.
13 The device for the controlled and independent rocking of 14 the bending and straightening platforms respectively is set forth in the main claim, whereas the dependent claims 16 describe variants of the idea of the main solution.
17 According to the invention the straightening platform is 18 installed on a parallelogram system suitable to keep 19 constant the required trim in relation to the horizontal and/or to the plane of unwinding of the wound bundle of rod, 21 whilst being able to move according to an arc of a circle.
22 The parallelogram system comprises a frontal arm and a 23 rear arm, both of which possess un upper pivot and a lower 24 pivot.
When the straightening axis is straight, that is to say, 26 when the rod enters and leaves the straightening assembly 27 practically on the same axis, the axis of the upper pivot of 28 the first frontal arm forms the passage of the rod.
29 Instead, when the straightening axis is offset as between the entry and exit of the rod, for instance as illustrated 31 in Fig.6 of the cited EP 87202107.6, the upper pivot of the 32 first frontal entry arm will include an offset hole, while 33 the upper pivot of the second frontal exit arm will include - 6 - ~3~,~7~

l a central hole.
2 According to a variant the axis of rotation of the lower 3 pivot of the first rear arm is connected to a positioning 9 system which, by displacing the position of that axis of rotation, maintains the parallelism of the arms, but the 6 trim of the the straightening platform is changed in 7 relation to the horizontal and/or in relation to the plane 8 of unwinding of the wound bundle of rod.
9 According to the invention the distance between the axis of rotation of the bending platform and the the axis of 11 entry of the rod into the bending assembly is equal to the 12 distance between the upper pivot and lower pivot of the arms 13 of the parallelogram system.
14 Moreover, according to the invention the axis of rotation of the bending platform coincides with the axis of rotation 16 of the lower pivots of the frontal arms of the parallelogram 17 system.
18 According to the lnvention the bending platform is 19 equipped with a first unit to control its trim, and this unit controls and acts on the parallelogram system, which 21 supports and positions the straightening platform by means 22 of a second unit to control the trim thereof.
23 A system to monitor the angular position of the respective 24 pivots cordinates the trim of both platforms.
According to a variant the lower pivot of the frontal arm 26 and the pivot of rotation of the bending platform are 27 substantially the same as each other and, when the preferred 28 trim of the straightening platform has been obtained, the 29 frontal arm and the lateral side of the bending platform are made substantially solidly fixed to each other.
31 A possible preferred embodiment of the invention is shown 32 as a non-restrictive example in the attached figures, which 33 illustrate two positions of the bending platform.

J~2 ~ ~ 7 ~

1 In the figures a straightening assembly 10 is located 2 upstream of a bending assembly 12. In the example shown, 3 the straightening assembly 10 is positioned on a 4 straightening platform 11, while the bending assembly 12 is located on a bending platform 13.
6 In this example the straightening assembly 10 has an inlet 7 14 offset in relation to its outlet 15 by a value "y".
8 The bending platform 13 comprises an inlet pipe 16 and can 9 be positioned in relation to the horizontal by being rotated about an axis 17 which is parallel to and below the axis of 11 the passage of rods 18.
12 The axis of rotation 17 is distant from the axis of the 13 inlet pipe 16 by a value of "x". The rotation of the 14 positioning of the bending platform 13 in relation to the horizontal causes rotation of the rod 18 according to an arc 16 of a circle having a radius "x".
17 Rotation of the positioning of the bending platform 13 is 18 obtained, for instance, by a first fluid cylinder/piston 19 actuator 19 with a controlled travel and positioning.
The straightening platform 11 is upheld in this example by 21 a parallelogram system 20 comprising two pairs of arms 21-22 22 and 23-24 respectively. Each arm cooperates with its own 23 upper 25 and lower 26 pivots.
24 The axis of the lower pivots 26 of the frontal arms 21-23 lies on the axis 17 of rotation of the bending platform 13 26 and coincides therewith.
27 According to the invention the distance between the axis 28 of rotation of the upper pivots 25 and the axis of rotation 29 of the lower pivots 26 of the frontal arms 21-23 has a value "x", the same as that of the distance in the bending 31 platform between the axis of the inlet pipe 16 and the axis 32 of rotation 17.
33 When the required angle of the straightening platform 11 ~Jn~J ~7i~

1 in relation to the horizontal, this being an angle to be 2 defined on a plane normal to the axis of rotation 17, has 3 been fixed by acting on the frontal arms 21 and/or 23 of the 4 parallelogram 20, for instance by means of a second cylinder/piston actuator 28 with a controlled travel and 6 positioning, the axis of the upper pivots 25 is rotated 7 about the axis of rotation 17 according to a radius having a 8 value "x".
9 If the straightening assembly 10 has its inlet 14 and outlet 15 on the same axis, the inlet 14 and outlet 15 will 11 coincide with the axis of rotation of the upper pivots 25.
12 Now, if an angular rotation of the bending platform 13 13 coincides with the angular rotation of the frontal arms 21-14 23 of the parallelogram 20, the outlet 15 of the straightening assembly 10 will always lie on the axis of the 16 upper pivots 25 of the frontal arms 21-23 and therefore on 17 the axis of the inlet pipe 16 of the bending assembly 12.
18 If instead, as in the example shown, the inlet 14 of the 19 straightening assembly 10 is offset by a value "y" in relation to the outlet 15 of that assembly, the hole 27 in 21 the upper pivot 25A of the frontal arm 21 upstream of the 22 straightening assembly 10 will be offset in relation to the 23 axis of rotation of the same pivot 25A by a value "y".
24 According to the invention the lower pivots 26A of the rear arms 22-24 are installed on a unit 29 to adjust 26 inclination of the straightening platform 11.
27 If the adjustment admitted is the minimum, the adjustment 28 unit 29 may include, for inatance, a movable support 30, 29 which can slide in guides and is actuated by a rack and pinion 31 driven by a motor 32.
31 If the adjustment admitted is considerable, the support 30 32 will slide in circular guides the generating radius of which 33 is the axis of rotation of the lower pivots 26 of the _ 1 frontal arms 21-23.
2 Other alternative systems can be employed, for instance, 3 by having the pivots 26A supported by levers which have 4 their axis of rotation on the axis of the lower pivot 26.
By means of the adjustment system the inclination of the 6 straightening platform 11 too in relation to the horizontal 7 axis can be obtained without the trim of the passage of the 8 rod beinq modified.

Claims (8)

1 - Device for the controlled and independent rocking of a bending platform and straightening platform in bending-shaping machines having an independent bending platform (13) located downstream of a straightening platform (11), in which machines the straightening platform (11) has a preferred inclination, whereas the bending platform (13) has an inclination depending on the product being processed at that time, the axis of rotation (17) for adjustment of the inclination of the bending platform (13) being positioned below and at a distance "x" from the axis of the inlet (16) of rods (18) onto the bending platform (13), the device being characterized in that the straightening platform (11) is supported on a parallelogram system (20) having the axis of lower pivots (26) distant by the value "x" from the axis of upper pivots (25), the axis of the lower pivots (26) coinciding with the axis (17) of rotation of the bending platform (13), whereas the axis of upper pivots (25) is kept so as to coincide substantially with the axis of the inlet (16) of rods (18).
2 - Device as claimed in Claim 1, in which with the straightening assembly (10) having its inlet (14) and outlet (15) offset from each other by a value "y" the hole (27) for passage of rods (18) is offset by a value "y" from the axis of rotation of the upper pivot (25A) of the frontal arm (21) positioned upstream of the straightening platform (11).
3 - Device as claimed in Claim 1 or 2, in which the lower pivots (26A) of the rear arms (22-24) of the parallelogram system (20) are supported by a unit (29) that adjusts the inclination of the straightening platform (11).
4 - Device as claimed in any claim hereinbefore, in which the straightening assembly (10) is positioned above the straightening platform (11).
5 - Device as claimed in any of Claims 1, 2 or 3, in which the straightening assembly (10) is positioned below the straightening platform (11).
6 - Device as claimed in any claim hereinbefore, in which the adjustment unit (29) comprises linear slider means for limited adjustments.
7 - Device as claimed in any claim hereinbefore, in which the adjustment unit (29) comprises circular slider means with a generating axis placed on the axis of rotation of the lower pivots (26) of the frontal arms (21-23).
8 - Device as claimed in any of Claims 1 to 6 inclusive, in which the adjustment unit (29) comprises arm means which connect the lower pivots (26-26A) of the frontal arms (21-23) and rear arms (22-24) respectively.
CA002027877A 1989-10-20 1990-10-17 Device for the controlled and independent rocking of straightening and bending platforms Abandoned CA2027877A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT83490A/89 1989-10-20
IT08349089A IT1236362B (en) 1989-10-20 1989-10-20 INDEPENDENT CONTROLLED AND INDEPENDENT TILTING DEVICE

Publications (1)

Publication Number Publication Date
CA2027877A1 true CA2027877A1 (en) 1991-04-21

Family

ID=11322537

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002027877A Abandoned CA2027877A1 (en) 1989-10-20 1990-10-17 Device for the controlled and independent rocking of straightening and bending platforms

Country Status (6)

Country Link
US (1) US5067337A (en)
EP (1) EP0423591A1 (en)
JP (1) JPH03264113A (en)
CA (1) CA2027877A1 (en)
DE (1) DE423591T1 (en)
IT (1) IT1236362B (en)

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US5154214A (en) * 1991-05-13 1992-10-13 Hagerman Randolph S Mortising jig
NL9401473A (en) * 1994-09-09 1996-04-01 Holland Mechanics Bv Bending device
DE19503850C1 (en) * 1995-02-06 1996-06-13 Post Friedhelm Sondermasch Non-rotating straightening unit for bending machines with an integrated measuring system
US5617754A (en) * 1995-12-21 1997-04-08 Kenneth A. Kauffman Single stage two plane coiled reinforcing bar stock straightener
GR1003500B (en) * 1999-04-06 2001-01-03 ������� & ��� �� "������" Reclining machine for aligning, bending, and cutting iron bars (automatic electronic strapping maker)
CN101831817B (en) * 2010-05-25 2011-09-21 玉溪玉杯金属制品有限公司 Stress remover bracket for zinc-coated wire
CN101864681B (en) * 2010-05-25 2011-09-21 玉溪玉杯金属制品有限公司 Stress relieving device pedestal
CN102764829A (en) * 2012-06-30 2012-11-07 大连伯新特钢制品有限公司 Special-shaped straightener
CN103182462B (en) * 2013-02-26 2014-11-19 山东迪一电子科技有限公司 Straightening machine for electronic component lead
US20170128997A1 (en) * 2014-03-27 2017-05-11 Libero Angelo MASSARO Overturnable bending machine
CN109351883B (en) * 2018-11-07 2024-02-23 华北理工大学 Manual reinforcing steel bar bending tool and operation method thereof
CN112845683B (en) * 2020-12-23 2023-12-22 佛山市仁钢五金制品有限公司 Stretching and straightening device for metal pipe machining

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DE496227C (en) * 1927-04-15 1930-04-17 Arthur Schulze Machine for bending round bars for reinforced concrete construction with a bending device designed as a parallelogram
US2567770A (en) * 1946-09-07 1951-09-11 Richard D Heller Wire straightener
US2517309A (en) * 1947-05-16 1950-08-01 Richard D Heller Wire straightener
US3052277A (en) * 1958-07-17 1962-09-04 Wirth Arno H Fa Bending machine
DE1527321A1 (en) * 1963-10-12 1969-10-30 Hille & Mueller Fa Method and device for straightening cold profiles
GB1321500A (en) * 1970-11-25 1973-06-27 Malmedie & Co Maschf Supply apparatus for a continuous workpiece
AT368724B (en) * 1976-05-28 1982-11-10 Hufnagl & Co Rista Draht BENDING MACHINE FOR WIRE
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IT1175134B (en) * 1983-10-12 1987-07-01 Piegatrici Macch Elettr METHOD AND MEANS FOR THE PRODUCTION OF SHAPES WITH ROUND OR WIRE BENDING MACHINES, PARTICULARLY LAMINATED AT LOW COST HOT ROLLING TO IMPROVE THE QUALITY OF THE FINISHED PRODUCT
EP0194478B1 (en) * 1985-03-08 1989-12-06 M.E.P. Macchine Elettroniche Piegatrici S.p.A. Device for straightening rods or wire without relative rotation of succeeding elements of material about the longitudinal axis
GB2190161B (en) * 1986-05-07 1990-09-19 Ronald Edward Benton Fluid flow or pressure transmission device
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FR2618089B3 (en) * 1987-07-16 1989-10-20 Renault METAL WIRE BENDING MACHINE

Also Published As

Publication number Publication date
EP0423591A1 (en) 1991-04-24
IT8983490A1 (en) 1991-04-20
US5067337A (en) 1991-11-26
JPH03264113A (en) 1991-11-25
DE423591T1 (en) 1991-11-07
IT1236362B (en) 1993-02-25

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Legal Events

Date Code Title Description
FZDE Discontinued