EP0316703A2 - Procédé et dispositif de pliage de pièces de travail - Google Patents

Procédé et dispositif de pliage de pièces de travail Download PDF

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Publication number
EP0316703A2
EP0316703A2 EP88118510A EP88118510A EP0316703A2 EP 0316703 A2 EP0316703 A2 EP 0316703A2 EP 88118510 A EP88118510 A EP 88118510A EP 88118510 A EP88118510 A EP 88118510A EP 0316703 A2 EP0316703 A2 EP 0316703A2
Authority
EP
European Patent Office
Prior art keywords
bending
workpiece
leg
bending angle
swivel
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.)
Ceased
Application number
EP88118510A
Other languages
German (de)
English (en)
Other versions
EP0316703A3 (fr
Inventor
Johannes Dipl. Ing. Haack
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.)
Feintool International Holding AG
Original Assignee
Feintool International Holding AG
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 Feintool International Holding AG filed Critical Feintool International Holding AG
Publication of EP0316703A2 publication Critical patent/EP0316703A2/fr
Publication of EP0316703A3 publication Critical patent/EP0316703A3/fr
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/10—Incompletely punching in such a manner that the parts are still coherent with the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/042—With a rotational movement of the bending blade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S72/00—Metal deforming
    • Y10S72/702—Overbending to compensate for springback

Definitions

  • the invention relates to a method for bending workpieces by swivel bending jaws, the bent part to the workpiece assuming a predetermined bending angle, and a device therefor.
  • a known conventional bending method works with a bending punch and a counter-holder, between which the workpiece is held. The punch and counterholder then move together with the workpiece past a bending jaw, the projecting part of the workpiece being bent by the bending radius of the punch.
  • a disadvantage of this bending process is that a workpiece is pulled off into a fixed gap. Furthermore, when the workpiece hits the bending jaw, a zone is created on the workpiece in which material is displaced. Furthermore, the bending gap must be precisely determined so that a correct bending takes place. Workpiece thickness tolerances cannot be taken into account. A possible springback of the bent part after loosening the punch and the counterhold cannot be counteracted.
  • this method also only allows bending in one operation.
  • the inventor has set himself the task of developing a method and a device of the type mentioned above, by means of which bending angles can be produced in the narrowest tolerance ranges, regardless of the strength, the material structure or the thickness of the workpiece, with several bends occurring simultaneously in one operation be carried out on a workpiece.
  • the solution to this problem is that, in a first bending process, at least one corresponding leg is bent from the workpiece by means of the swivel bending jaw, then the swivel bending jaw is released from the leg and a springback of the leg or the actual bending angle generated is determined by direct measurement and with a target -Bending angle is compared and then by a new bending process by overbending a match between the target bending angle and the actual bending angle.
  • the actual bending angle is not inferred from the angular position of the surfaces of the rotary jaws, but this actual bending angle is measured directly.
  • at least one swivel bending jaw is assigned to a bending anvil and a punch, the bending anvil and punch holding the workpiece between them.
  • the one level for determining the bending angle is thus clearly defined.
  • This device preferably consists of a measuring pin which can be guided against a bent leg of the workpiece. Since this measuring pin or its position is pre-calibrated, it indicates the bending angle precisely when it hits the bent leg.
  • the measured actual bending angle is now fed to a computer and compared there with the target bending angle.
  • the computer has a corresponding program for a wide variety of materials, which is used to determine the degree of overbending in a second bending process. In practice, it has been shown that this second bending process allows bending to the smallest tolerances. Where even greater accuracies are required, the bending angle can be measured again and this can be corrected again in a third bending process.
  • the computer can record the actual bending angle and pass it on to the corresponding workpiece as a control card.
  • This described method makes it possible to produce stampings of any shape with bends in one operation, which are absolutely correct in terms of dimensions.
  • the workpieces can consist of all possible materials, they just have to be able to bend. With steel parts, bending is also successful in the tempered state.
  • the movement of the measuring pin is detected by a corresponding probe.
  • probes are commercially available and are therefore not to be described in detail.
  • an angle lever can be arranged between the measuring pin and the probe, which rotates about a corresponding axis, wherein it engages with one leg, for example, a push button of the measuring probe, while its other leg is acted upon by the measuring pin.
  • a spring In order to ensure the intimate contact between the leg and the measuring pin, it has proven advisable to support this leg of the measuring pin on the other hand against a spring.
  • the device for determining the bending angle described above is only intended to be exemplary. Non-contact sensors or the like are also conceivable. There should also be no limit to the arrangement or number of devices for determining the bending angle. Should z. B. a leg of a workpiece down, d. H. towards the bend anvil and another leg up, d. H. towards the punch, it will be advisable to arrange one device in the punch and the other in the bend anvil. In order to ensure overbending, it may be necessary to make the anvil and / or punch conical.
  • This actual core of the device for bending workpieces is provided as a single press or as a work step in a progressive tool or as a work step in a step press tool set.
  • the press can be a C-frame press or an O-frame press.
  • Each swivel bending jaw has a jaw body which rotates about an axis.
  • the axis is partially formed by corresponding stub shafts with which the swivel jaw is held in corresponding bearings.
  • This drive can consist, for example, of an electrohydraulic torque booster, which is customary in the trade and which generally contains a hydraulic motor, an NC valve, a control slide and a pilot motor.
  • an electrohydraulic linear amplifier which is also commercially available and usually consists of a hydraulic cylinder, an NC valve, a pilot motor.
  • a piston rod leads from the hydraulic cylinder into a linkage of a lever mechanism and engages the axle or the shaft end via a corresponding lever.
  • the jaw body is attacked directly by an electrohydraulic linear amplifier, the piston rod of which, for example, is articulatedly connected to a bolt on the jaw body. Since this bolt makes a circular movement, the cylinder should be pivoted in a pivot bearing.
  • each individual swivel jaw with a corresponding drive, or to couple only one swivel jaw to a drive and establish the connection to the other swivel jaw using appropriate gear elements.
  • gear elements there is no limit to the scope of the invention.
  • the jaw body of the swivel bending jaw should preferably consist of two lateral supports, which form a guide surface between them.
  • the guide surface is sunk between the two supports and thus forms a receiving channel for the leg of the workpiece to be bent.
  • the inner edge of this guide surface also lies outside the axis of rotation of the swivel bending jaw, so that the guide surface lies flat when the leg is bent and, for example, there is no material displacement by hitting a bending edge.
  • the guide surface can be covered with an additional wear part, which is hardened or coated. This wear part is replaced when signs of wear appear and replaced with a new part.
  • a further bending or bending of a section from the workpiece In other areas of application of the invention, it has been found necessary to provide, for example, in addition to the bending of legs from a workpiece, a further bending or bending of a section from the workpiece.
  • the bending punch or the anvil is penetrated by an additional bending plunger, the end face of which is preferably modeled on the section to be bent.
  • the bending plunger is provided in the bending punch, it can be connected to the support, which should then maintain a certain distance from the bending punch in an initial position.
  • the bending punch When the bending punch is lowered, it hits the workpiece and stops, while the support can be pushed further against a corresponding counterpressure in the direction of the bending punch, thus eliminating the distance between the two elements. As a result, the bending ram moves out of the punch and carries out its bending process.
  • this ram does not necessarily have to be arranged in the ram or anvil itself, but it can also be located next to the ram or anvil, just at the point where the workpiece is to be bent.
  • the workpiece must be positioned exactly between the punch and the anvil so that the corresponding bends are made by the swivel jaws at the predetermined locations.
  • the bending anvil is penetrated by a positioning stamp which is assigned to a separate, for example double-acting hydraulic cylinder.
  • a device is created by means of which a large number of bends can be made on a workpiece in a single operation. These bends have dimensional accuracy within a narrow tolerance range, so that they meet the highest demands.
  • the bending punch 2 is moved downwards in the direction z by a plunger of a hydraulically driven machine, which is not shown in more detail in FIG. 1. In its lower end position it hits the workpiece 1 and clamps it on the bending anvil 3. Then the swivel bending jaws 4 and 5 pivot in the swivel direction x upward about the axes M and thus bend the left and right legs 6 and 7 of the workpiece 1, so that a U-shaped workpiece is produced.
  • FIG. 2 shows a cross section through the bending die 2, which shows a measuring device R according to the invention for determining the bending angle.
  • This device R has a probe 8 which is held in the punch 2 by means of a clamping screw 9. This probe 8 protrudes with a push button 10 into a space 11 in the punch 2. In the space 11 there is an angle lever 12 which rotates about an axis A and engages the push button 10 with one leg 13, while another leg 14 can be acted upon by a measuring pin 15 or its head 16.
  • the leg 14 is attacked by a spring 17 which is arranged between the leg 14 and a grub screw 18.
  • the measuring pin 15 strikes the bent leg 6 of the workpiece 1 in the use position and can accordingly determine the actual value of the bending angle w.
  • a change in the bending angle w acts on the leg 14 of the angle lever 12 via the measuring pin 15, so that this change is also transmitted to the leg 13 which engages the push button 10 of the probe 8.
  • This measured value of the bending angle w is entered via a corresponding line 19 into a computer described below and evaluated there.
  • the device R can also consist of an electronic or optical sensor, which determines the bending angle w directly instead of the measuring pin. Furthermore, the probe 8 can also be used directly instead of the measuring pen. There should be no limit to the invention here.
  • the positioning plunger 21 is actuated, for example, via a double-acting hydraulic cylinder unit 22, which is only partially shown in FIG. 2.
  • the positioning stamp 21 can have any other shape, in which case the bore 20 must be adapted accordingly. In the exemplary embodiment shown, it engages through the bore 20 into a blind hole 23 in the end face of the bending die 2.
  • the workpiece is fed and inserted onto the bending anvil 3 with a blank feeder (not shown in more detail), the flat workpiece 1 being detected, for example, with a tongue, a sucker or magnet and being removed fully automatically from a stack magazine.
  • a blank feeder not shown in more detail
  • the type of feeding device used in each individual case depends on the material of the workpiece, its thickness, its shape and its weight.
  • the bent workpiece is also removed from the device P using a parts removal device and is preferably stored in a positionally positioned manner in order not to damage the dimensionally accurate, bent workpiece.
  • the device P for bending workpieces is preferably arranged in a column guide frame 24 (see FIG. 3). With this column guide frame 24, the bending die 2 and the bending anvil 3 together with the swivel bending jaws 4 and 5 can be positioned exactly so that the holding of the workpiece 1 is secured.
  • such a column guide frame 24 can consist of a lower block 25 on which the bending anvil 3 sits.
  • the bending punch 2 is supported by a support 26 against an upper block 27.
  • the support 26 is attacked by a plunger, indicated at 28, of a hydraulic drive (not shown in more detail) for lowering the support 26 or the bending die 2.
  • longitudinal bores 29 are also provided for receiving pressure bolts described below.
  • the swivel bending jaw 4/5 shown in FIG. 4 has a jaw body 37, from which shaft stubs 38 protrude on both sides.
  • the longitudinal axis of the stub shaft 38 simultaneously forms the axis M about which the swivel bending jaws 4/5 rotate in the swivel direction x. With small bending forces, one-sided storage is also sufficient.
  • a guide surface 40 is provided between two supports 39 in the form of a segment of a circle, which together with the supports 39 forms a receiving channel 41 for the legs 6 and 7 of the workpiece 1.
  • the base of the receiving channel 41 is formed by a wearing part 42, which is embedded in the guide surface 40 and is fixed via corresponding fastening elements 43.
  • the wearing part 42 can be hardened or specially coated or treated differently.
  • a feather key 44 is provided for transmitting a drive torque, which causes the pivoting jaw 4/5 to move in the pivoting direction x.
  • a gear 45 is shown schematically, wherein a gear output shaft is connected via a corresponding coupling 46 directly to the stub shaft 38 via the key 44.
  • a drive is coupled to the transmission 45, which in the present exemplary embodiment is intended to be an electrohydraulic torque amplifier.
  • This electrohydraulic torque amplifier is commercially available and consists of a hydraulic motor 47, an NC valve 48, a control slide 49 and a pilot motor 50.
  • the connection is made to a computer 51 of a control logic which also measures the measuring pulses of the device R for Determination of the bending angle w picks up.
  • this computer 51 the actual value of the bending angle w determined by means of the measuring pin 15 is compared with a desired target value.
  • the gear 45 is addressed via the electrohydraulic torque amplifier 47-50 and a subsequent bend is carried out via the swivel bending jaws 4 and 5 to correct the bending angle w.
  • each swivel bending jaw 4 or 5 has its own drive of this type.
  • gear elements such as gears, toothed racks, cardanic joints or the like, so that they carry out exactly the same bending movement .
  • the hydraulic motor is replaced by a hydraulic cylinder 52.
  • a commercially available electrohydraulic linear amplifier is also used which, in addition to the hydraulic cylinder 52 and the NC valve 48, also has a control slide 49 and a pilot motor 50.
  • the piston rod 53 of the hydraulic cylinder 52 engages in a link 54 of a lever gear 55, which is only indicated schematically.
  • This lever gear 55 or a connecting rod 55a guides the force of the hydraulic cylinder 52 via the link 54 via a lever 56 directly to the pivot axis M.
  • Such a drive via an electrohydraulic linear amplifier is used when large bending forces are required, since practically unlimited forces can be applied to the swivel bending jaws 4/5 due to the hydraulic cylinder diameter.
  • each swivel bending jaw 4/5 can be driven individually in order to bring each leg of the workpiece into a desired angular position.
  • NC valve 48 controls either the hydraulic cylinder 52 or the hydraulic motor 47, it receiving its pressure oil preferably from the hydraulic system integrated in the device P.
  • a drive for the swivel jaws 4 and 5 is shown, which engages the swivel jaws 4 and 5 directly.
  • an electro-hydraulic linear amplifier 57 is provided, which is coupled via a piston rod 58 directly to a bolt 59 on the swivel bending jaw 4/5.
  • the cylinder 57 is arranged so as to be rotatable about a pivot bearing 60.
  • FIGS. 8 to 11 A movement sequence for bending a workpiece is shown in FIGS. 8 to 11, a triple bending taking place here.
  • Fig. 8 the position is indicated in which the punch 2 is already seated on the workpiece 1 and presses it against the anvil 3.
  • the workpiece 1 is already positioned, as shown in FIG. 2.
  • a predetermined variable distance a is maintained in this exemplary embodiment, which is dimensioned such that a bending plunger 61 protruding from the support 26 and penetrating an axial bore 62 of the bending punch 2 is drawn into the latter.
  • the swivel bending jaws 4 and 5 are now moved about their corresponding axis M in the swivel direction x.
  • the conical cutting of the bending die 2 allows the legs 6 and 7 to be bent over 90 °, but this should only be done in exceptional cases when the legs 6 and 7 are bent for the first time.
  • the first bending should only take place up to this target. In this way it is avoided that overbending takes place immediately over the desired target, which cannot be reversed by means of the device according to the invention.
  • a bend angle w of 90 ° is desired.
  • the swivel bending jaws 4 and 5 are only swiveled by 90 ° during the first bend. Then the pivoting jaws 4 and 5 are opened by approximately 5 °, so that the legs 6 and 7 are released. These spring back into an reached bending position, the actually achieved bending angle w being determined via the measuring pins 15, which are not shown for the sake of clarity.
  • the computer 51 can now determine the difference .alpha. Or .beta. Between the actually achieved bending angle w and the desired bending angle.
  • the measuring system is otherwise designed so that a quality control card can be printed out for each bent workpiece or a series of workpieces, so that the customer can verify the bending accuracy.
EP88118510A 1987-11-19 1988-11-07 Procédé et dispositif de pliage de pièces de travail Ceased EP0316703A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873739173 DE3739173A1 (de) 1987-11-19 1987-11-19 Verfahren und vorrichtung zum biegen von werkstuecken
DE3739173 1987-11-19

Publications (2)

Publication Number Publication Date
EP0316703A2 true EP0316703A2 (fr) 1989-05-24
EP0316703A3 EP0316703A3 (fr) 1990-07-11

Family

ID=6340777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118510A Ceased EP0316703A3 (fr) 1987-11-19 1988-11-07 Procédé et dispositif de pliage de pièces de travail

Country Status (5)

Country Link
US (1) US5007264A (fr)
EP (1) EP0316703A3 (fr)
JP (1) JPH01162520A (fr)
DE (1) DE3739173A1 (fr)
RU (1) RU1806031C (fr)

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DE10164002A1 (de) * 2001-12-28 2003-07-10 Hochstrate Wolfram Verfahren zum Biegen eines flächigen Werkstücks auf einer Schwenkbiegemaschine und Anordnung zur Durchführung des Verfahrens
AT516834B1 (de) * 2015-05-26 2016-09-15 Trumpf Maschinen Austria Gmbh & Co Kg Verfahren zum Schwenkbiegen
CN114433682A (zh) * 2021-12-29 2022-05-06 云路复合材料(上海)有限公司 用于异形曲面的u形折弯设备
AT526567A1 (de) * 2022-09-27 2024-04-15 Trumpf Maschinen Austria Gmbh & Co Kg Biegemaschine mit Bearbeitungswerkzeug für Blechwerkstücke

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DE10164002A1 (de) * 2001-12-28 2003-07-10 Hochstrate Wolfram Verfahren zum Biegen eines flächigen Werkstücks auf einer Schwenkbiegemaschine und Anordnung zur Durchführung des Verfahrens
DE10164002B4 (de) * 2001-12-28 2004-11-11 Wolfram Hochstrate Verfahren und Vorrichtung zum Biegen eines flächigen Werkstücks auf einer Schwenkbiegemaschine
AT516834B1 (de) * 2015-05-26 2016-09-15 Trumpf Maschinen Austria Gmbh & Co Kg Verfahren zum Schwenkbiegen
AT516834A4 (de) * 2015-05-26 2016-09-15 Trumpf Maschinen Austria Gmbh & Co Kg Verfahren zum Schwenkbiegen
WO2016187633A1 (fr) * 2015-05-26 2016-12-01 Trumpf Maschinen Austria Gmbh & Co. Kg. Procédé de cintrage
CN114433682A (zh) * 2021-12-29 2022-05-06 云路复合材料(上海)有限公司 用于异形曲面的u形折弯设备
AT526567A1 (de) * 2022-09-27 2024-04-15 Trumpf Maschinen Austria Gmbh & Co Kg Biegemaschine mit Bearbeitungswerkzeug für Blechwerkstücke

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JPH01162520A (ja) 1989-06-27
DE3739173A1 (de) 1989-06-01
RU1806031C (ru) 1993-03-30
EP0316703A3 (fr) 1990-07-11
US5007264A (en) 1991-04-16

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