EP2210685B1 - Procédé destiné à la correction des déformations lors du poinçonnage de tôles - Google Patents

Procédé destiné à la correction des déformations lors du poinçonnage de tôles Download PDF

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Publication number
EP2210685B1
EP2210685B1 EP20090001081 EP09001081A EP2210685B1 EP 2210685 B1 EP2210685 B1 EP 2210685B1 EP 20090001081 EP20090001081 EP 20090001081 EP 09001081 A EP09001081 A EP 09001081A EP 2210685 B1 EP2210685 B1 EP 2210685B1
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EP
European Patent Office
Prior art keywords
sheet metal
lower tool
punching
tool holder
sheet
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.)
Active
Application number
EP20090001081
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German (de)
English (en)
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EP2210685A1 (fr
Inventor
Werner Erlenmaier
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.)
Trumpf Werkzeugmaschinen SE and Co KG
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Trumpf Werkzeugmaschinen SE and Co KG
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Application filed by Trumpf Werkzeugmaschinen SE and Co KG filed Critical Trumpf Werkzeugmaschinen SE and Co KG
Priority to EP20090001081 priority Critical patent/EP2210685B1/fr
Publication of EP2210685A1 publication Critical patent/EP2210685A1/fr
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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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/003—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools
    • B21D45/006—Stripping-off devices
    • 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
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • 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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/06—Stripping-off devices

Definitions

  • the invention relates to a method for correcting deformations of sheets during punching on punching machines.
  • openings such as round holes are punched out of the sheet metal.
  • the sheet is pressed by a punch in a die.
  • the contour of the opening in the die corresponds to the contour of the punch.
  • the dimension of the opening in the die is circumferentially larger by a few tenths of a millimeter than the dimension of the punch.
  • the sheet is pressed into the die at the initial stage of the punching operation, deforming and creating a tensile stress on the upper surface of the sheet.
  • the upper portion of a punch is sheared by shearing forces between the punch and the die, and the lower portion then finally breaks due to the reduced load-bearing cross section.
  • the initially introduced by the deformation tensile stress is retained in the sheet, so that the entire metal sheet or individual sheet sections, depending on the size and the number of introduced punched, deform. Due to the tensile stress, the outer regions of the metal sheet or the individual sheet metal sections, with the exception of the areas where the sheet is firmly clamped, bent upwards. This leads to inaccuracies in the further processing and a higher tool wear.
  • the bent sheet metal is made tension-free by multiple forming of the sheet by an arrangement of several rolls.
  • the rollers are arranged offset from each other in a lower row and an upper row. Viewed in the axial direction of the rollers, the lower sector of the surface of the upper rollers is deeper than the upper sector of the surface of the lower rollers. This causes the sheet, as it moves through the rollers, to repeatedly bend in the opposite direction. By this multiple bending of the sheet, the stresses are removed and there is a flat, tension-free sheet metal.
  • this processing is complicated because an additional machine and other operations are required. In addition, this processing is not possible for sheets in which conversions were already introduced on the punching machine.
  • Patent Abstracts of Japan JP 2005 028403 A shows a die-mounting device in punching machines.
  • a sheet metal plate bent upwards and thereby plastically deformed.
  • the object is achieved by a method according to claim 1.
  • a punching machine 1 is shown with a tool set.
  • An integral part of the punching machine 1 is here a C-frame 2.
  • the C-frame 2 consists of a torsion-resistant welded steel construction.
  • the frame can also be executed in a different form.
  • a hydraulic unit 3 is provided, with which a plunger 4 is hydraulically driven via a plunger control 5.
  • the punching machine has an axis 6, which is the center axis of a lower tool holder 7 and the plunger 4 with an upper tool holder.
  • the lower tool holder 7 is provided on the lower inside of the C-frame 2 for receiving a tool lower part of the tool set.
  • the lower tool holder 7 is rotatable about a rotary drive, not shown, and lockable in any angular position.
  • the lower tool holder 7 a drive 8, which moves the lower tool holder 7 along the axis 6. Of the Drive 8 can be controlled so that it stops at any position within its drive path, and then moves forward or backward.
  • the plunger 4 is provided on the upper inside of the C-frame 2.
  • the plunger 4 with the upper tool holder takes a tool shell 16 of the tool set form-fitting and free of play.
  • the plunger 4 is also rotatable and can be detected in any angular position. For a second, not shown rotary drive is available.
  • the plunger 4, driven by the plunger control 5 can be stopped at any position within its stroke along the axis 6, and then moved up or down.
  • a receptacle, not shown, for a scraper is also provided on the upper inside of the C-frame.
  • All actuators such as the rotary actuators, the plunger control 5 and the drive 8 of the lower tool holder 7 are controlled by a machine control device, not shown, which is provided in a separate cabinet. Furthermore, all drives for moving a metal plate 15 and actuators for special functions, such as the folding and folding up a partial flap, not shown, are controlled by the machine control device.
  • the control device has as input and output means a keyboard and a monitor. The control functions are performed by microcontrollers. Processing programs and operating parameters are stored in a memory area of the control device.
  • a machine table 9 On the lower inside of the C-frame 2, a machine table 9 is arranged, which is a cross rail 10 with a tool magazine 11 has.
  • clamping claws 12 are arranged to hold the metal plate 15.
  • the clamping claws 12 can be fixed at suitable locations on the cross rail 10, and can be offset so that the metal plate 15 is held securely, but the metal plate 15 is not gripped on a surface to be machined.
  • tool holders 13 In the tool magazine 11 more, here three, tool holders 13 for several, here two, tool sets 14 are present.
  • the machine table 9 travels in a Y direction together with the cross rail 10, to which the clamps 12 are fixed, with which the plate 15 is held, in a programmed position, and the cross rail 10 moves in the X direction in the programmed position, wherein the plate 15 slides over the machine table 9. Then, a punching stroke is performed by the plunger 4. Following this, the next punching position is approached according to the same principle.
  • the tool sets 14 are automatically changed, driven by the machine control device, changed.
  • the cross rail 10 driven by a drive, not shown, moves into a position in an X direction so that the X position of the tool set 14 to be loaded corresponds to the X position of the lower tool holder 7 .
  • the cross rail 10 then moves together with the machine table 9, driven by a further drive, in a position in the Y direction in which an axis of the tool set 14 with the central axis 6 of the lower tool holder 7 and the plunger 4 matches, so that the Tool set 14 can be added to the lower tool holder 7 and into the tool holder of the plunger 4.
  • a scraper belonging to the tool set 14 is thereby transferred to the corresponding receiving device. Unless in the tool holder the plunger 4 and in the lower tool holder 7, a tool is present, this is previously released to a free space in the tool magazine 11.
  • a tool set 14 installed in the punching machine 1 in installation position is shown in a basic representation.
  • the tool set 14 has a tool upper part 16 and a lower tool part 17, and a scraper 18.
  • the axis 6 of the tool holders 4, 7 of the punching machine 1 is also the axis 6 of the upper tool part 16, the lower tool part 17 and the scraper 18 in the installed state of the tool set.
  • the upper tool part 16 has a punch shaft 19, which is received positively and without play in the plunger 4.
  • the punch shaft 19 has a cutting edge 20.
  • the contour of the cutting edge 20 determines the shape of the punched-out in the metal plate 15th
  • a receptacle 21 for the scraper 18 is provided on the upper inside of the C-frame 2.
  • the scraper 18 associated with the tool set 14 is loaded into the receptacle 21 and fastened there.
  • the scraper 18 has a shape having at the lower end a disc-shaped portion 24 and along the outer edge of the disc-shaped portion 24 a in Fig. 2 In an approximately vertically upwardly extending edge 22, wherein the wall thickness of the scraper 18 in the region of the edge 22 and a transition region 23 between the edge 22 and the disc-shaped portion 24 is greater than in the disc-shaped portion 24.
  • the Scraper 18 here has a recess 27, which allows the blade 20 can pass through the scraper 18.
  • the recess 27 can be provided at an off-center blade 20 and outside the range of the axis 6.
  • the stiffness of the scraper 18 in the direction of the axis 6 is greater than in the disk-shaped region 24 in which the upper side and the lower side are parallel and have a smaller wall thickness , This favors a deformation of the disk-shaped region 24 of the scraper 18 in relation to the regions 22 and 23.
  • the different stiffnesses can also be achieved by other design measures or by a special selection of materials.
  • the lower tool part 17 is shown received in the lower tool holder 7.
  • the connection between the lower tool holder 7 and the lower tool part 17 is positively and play-free, so that the rotational and axial movements of the lower tool holder 7 are transmitted to the lower tool part 17.
  • the tool lower part 17 has a die insert 25 in the center.
  • the die insert 25 has in its center an opening 26 whose contour is complementary to the contour of the cutting edge 20.
  • the dimensions of the contour of the opening 26 are slightly larger relative to the dimensions of the contour of the cutting edge 20 to form a cutting gap required for a punching operation.
  • the cutting gap is usually about 10% of the thickness of the sheet to be machined.
  • Circumferentially around the opening 26, a circumferential edge is provided on the upper side of the die insert 25. The peripheral edge is raised above the upper surface of the tool lower part 17.
  • the Fig. 2 shows an area of the punching machine with the tool insert 14 before a processing step of a punching operation.
  • Fig. 3 shows the end of a processing step in which the cutting edge 20 has just penetrated the metal plate 15.
  • the stiffness of the scraper 18 with respect to a movement of the lower surface upwardly in the direction of the axis 6 is greater, so that this area can not be deformed almost upwards.
  • the stiffness of the scraper 18 is lower with respect to an upward deformation in the direction of the axis 6, also the deformation of the sheet 15 and the blank holder 18 is caused by the edge of the die insert 25, which is arranged radially in the region 24 of the blank holder 18 , This results in a radially circumferential deformation of the disk-shaped portion 24 of the scraper 18 in its center upwards.
  • the metal plate 15 is bent around the generated punching around upwards, wherein the metal plate 15 is supported on the lower surface of the scraper 18 in the areas 22 and 23.
  • the Sheet metal plate 15 plastically deformed and the flatness of the metal plate 15 made before the punching process again.
  • the lower tool holder 7 does not move simultaneously with the plunger 4.
  • the recess is punched in the metal plate 15, and then the sheet is bent up to eliminate the deformation due to the tensile stresses again.
  • the sheet is not pressed against the scraper and thereby deformed, but the sheet is deformed against a device specially provided for this purpose.
  • the length of the path which the lower tool holder moves axially upward is determined empirically and is dependent on processing parameters, e.g. the sheet thickness, the sheet type, i. the material and the properties of the sheet, and the size and shape of the punched, so the type of tool set used 14, stored in the memory area of the machine control device.
  • the punching machine has a device, for example a reflex sensor, for detecting a deformation of the metal plate 15, with which a bending of the sheet is detected at a certain distance from the generated recess due to the tensile stress during the punching process.
  • a device for example a reflex sensor, for detecting a deformation of the metal plate 15, with which a bending of the sheet is detected at a certain distance from the generated recess due to the tensile stress during the punching process.
  • the lower tool holder 7 is again moved upward, wherein the travel of the lower tool holder 7 is increased.
  • the deformation is checked again after this step, and if the result of the check is satisfactory, the changed value of the travel path stored in the machine control device, otherwise the correction is repeated.

Claims (11)

  1. Procédé de correction de déformations d'une plaque de tôle (15) usinée par estampage dans une machine à estamper (1), de manière à rétablir la planéité de la plaque de tôle (15), où une réception inférieure d'outil (7) est déplacée vers le haut, de manière à déplacer la plaque de tôle (15) vers le haut, jusqu'à ce que la plaque de tôle (15) s'appuie contre un dispositif spécialement conçu pour la déformation de la plaque de tôle (15) et soit cintrée vers le haut, et que la plaque de tôle (15) soit cintrée vers le haut par une pièce inférieure d'outil (17) logée dans la réception inférieure d'outil (7), et plastiquement déformée en conséquence.
  2. Procédé de correction de déformations d'une plaque de tôle (15) usinée par estampage dans une machine à estamper (1), de manière à rétablir la planéité de la plaque de tôle (15), où une réception inférieure d'outil (7) est déplacée vers le haut, de manière à cintrer la plaque de tôle (15) vers le haut au moyen d'une pièce inférieure d'outil (17) logée dans la réception inférieure d'outil (7), et à la déformer plastiquement en conséquence, la plaque de tôle (15) étant déplacée vers le haut jusqu'à ce que la plaque de tôle (15) s'appuie contre un déflecteur (18) dans une zone (22, 23) avec une rigidité élevée, et que la plaque de tôle (15) soit cintrée vers le haut dans une zone radiale (24) avec une rigidité moindre du déflecteur (18), ou dans un évidement (27).
  3. Procédé selon la revendication 1 ou la revendication 2, caractérisé en ce qu'une pièce supérieure d'outil (16) est déplacée vers le bas pour estampage, la pièce inférieure d'outil (17) étant simultanément déplacée vers le haut pour une compression vers le haut de la plaque de tôle (15).
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la déformation de la plaque de tôle (15) est exécutée en tant que surcintrage, de manière à cintrer vers le haut la surface de la plaque de tôle (15), au-delà de l'état de planéité.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la longueur de la course suivant laquelle la réception inférieure d'outil (7) est déplacée vers le haut, est prédéfinie par un dispositif de commande de la machine.
  6. Procédé selon la revendication 5, caractérisé en ce que la longueur de la course est déterminée en fonction de paramètres d'usinage, est prédéfinie par la commande de machine à partir d'un enregistrement de données mémorisé, ou est calculée.
  7. Procédé selon la revendication 6, caractérisé en ce qu'un paramètre d'usinage est un jeu d'outil (14) utilisé.
  8. Procédé selon l'une des revendications 6 ou 7, caractérisé en ce qu'un paramètre d'usinage est une épaisseur de la plaque de tôle (15).
  9. Procédé selon l'une des revendications 6 à 8, caractérisé en ce qu'un paramètre d'usinage est un type de tôle (15).
  10. Procédé selon l'une des revendications 5 à 9, caractérisé en ce qu'après déplacement vers le haut de la réception inférieure d'outil (7), la déformation de la tôle (15) est détectée par un dispositif d'enregistrement des déformations de tôle, et en ce qu'en cas de déformation continuant à être présentée, la tôle (15) est une nouvelle fois comprimée vers le haut, la longueur de la course étant alors augmentée.
  11. Procédé selon la revendication 10, caractérisé en ce que la longueur de course augmentée est mémorisée en étant associée aux paramètres du jeu d'outil et de la tôle.
EP20090001081 2009-01-27 2009-01-27 Procédé destiné à la correction des déformations lors du poinçonnage de tôles Active EP2210685B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20090001081 EP2210685B1 (fr) 2009-01-27 2009-01-27 Procédé destiné à la correction des déformations lors du poinçonnage de tôles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20090001081 EP2210685B1 (fr) 2009-01-27 2009-01-27 Procédé destiné à la correction des déformations lors du poinçonnage de tôles

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EP2210685A1 EP2210685A1 (fr) 2010-07-28
EP2210685B1 true EP2210685B1 (fr) 2012-11-07

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110405004B (zh) * 2019-08-26 2024-01-12 桂林电子科技大学 一种离合器从动盘内环整平装置及整平方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4041817A (en) * 1976-10-06 1977-08-16 Houdaille Industries, Inc. Punch holder and stripper combination
US4261237A (en) * 1979-03-16 1981-04-14 Houdaille Industries, Inc. Rigidly supported molded plastics material punch guide and stripper
US6311594B1 (en) * 1996-07-03 2001-11-06 Amada Company, Limited Punch guiding apparatus and stripper plate used therefor
DE29804632U1 (de) * 1998-03-14 1998-05-20 Opel Adam Ag Lochpresse
KR101165391B1 (ko) * 2003-04-30 2012-07-12 오일레스고교 가부시키가이샤 박판 금속의 펀칭용의 펀치 및 이 펀치를 구비한 박판금속의 펀칭 장치
JP4289484B2 (ja) * 2003-07-14 2009-07-01 株式会社アマダ パンチプレスにおけるダイ装着装置

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