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EP0341211B1 - Procédé de pliage de tôle - Google Patents

Procédé de pliage de tôle Download PDF

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Publication number
EP0341211B1
EP0341211B1 EP89810322A EP89810322A EP0341211B1 EP 0341211 B1 EP0341211 B1 EP 0341211B1 EP 89810322 A EP89810322 A EP 89810322A EP 89810322 A EP89810322 A EP 89810322A EP 0341211 B1 EP0341211 B1 EP 0341211B1
Authority
EP
European Patent Office
Prior art keywords
bending
angle
bottom die
curve
sheet metal
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.)
Expired - Lifetime
Application number
EP89810322A
Other languages
German (de)
English (en)
Other versions
EP0341211A2 (fr
EP0341211A3 (en
Inventor
Vaclav Zbornik
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.)
Haemmerle AG Maschinenfabrik
Original Assignee
Haemmerle AG Maschinenfabrik
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 Haemmerle AG Maschinenfabrik filed Critical Haemmerle AG Maschinenfabrik
Publication of EP0341211A2 publication Critical patent/EP0341211A2/fr
Publication of EP0341211A3 publication Critical patent/EP0341211A3/de
Application granted granted Critical
Publication of EP0341211B1 publication Critical patent/EP0341211B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means

Definitions

  • the present invention relates to a method for bending sheet metal with the aid of a bending device which has a bending punch and a die with an adjustable bottom, into which die the bending punch penetrates, depending on the desired bending angle, until the sheet is driven onto the die bottom, the theoretical Bending angle with constant die opening is determined by the relative position of the die bottom to the die opening.
  • a method for bending sheet metal with the aid of a bending device which has a bending punch and a die with an adjustable bottom, into which die the bending punch penetrates, depending on the desired bending angle, until the sheet is driven onto the die bottom, the theoretical Bending angle with constant die opening is determined by the relative position of the die bottom to the die opening.
  • the desired angle could theoretically be set simply and repeatably.
  • deviations in the bending angle occur.
  • this is due to the fact that during the bending process in the sheet metal, the theoretical, sharp edge is never created, which is the working edge of the punch corresponds, but there are roundings during bending, which significantly influence the bending angle.
  • the two sheet metal legs spring back somewhat as soon as the sheet metal is released from the bending pressure. The size of the springback also depends on the sheet thickness and the material quality, so that the actual final bending angle can never be predicted theoretically with precision.
  • the aim of the invention is such a sheet metal bending process easier to design and still achieve a further increased accuracy with regard to the resulting final bending angle.
  • the proposed procedure has the features summarized in claim 1.
  • angle measurements during the bending process are used to determine the correct height of the die base. It is possible with the aid of the proposed method to set the floor to the correct penetration depth on the basis of the determined angle differences during the bending process, the actual setpoint angle being exactly maintained at the end of the bending process.
  • This process is significantly simpler than the known process and represents a major step forward.
  • a bending device For bending sheet metal pieces, a bending device is used, which is known per se and consists of a bending punch and a die with an adjustable bottom, into which the bending punch penetrates more or less depending on the bending angle.
  • the theoretical bending angle is given by the position of the die bottom relative to the die opening while the die opening remains the same.
  • a bending punch 1 is provided, which works together with the fixed bending die 2, which has an adjustable base 3.
  • the same is pressed against the adjustable base 3 along an edge 5 with the aid of the bending die 1.
  • the angle W formed is determined by the position of the edge 5 with respect to the contact edges 6 of the die 2.
  • the depth of penetration of the bending die 1 is designated E in FIG. 1.
  • the bending angle W is from the rounding radius depending on the bending edge. 2 schematically shows how the angle W changes.
  • the sheet metal piece 4a has (theoretically) a very sharp edge in the form of a line, while the sheet metal piece 4b has a rounded bending edge. It can be clearly seen that the angle which the two legs of the sheet metal piece 4a enclose is somewhat larger than the angle enclosed by the legs of the sheet metal piece 4b. The following generally applies (with unchanged die setting): The larger the rounding radius of the bending edge, the smaller the resulting bending angle.
  • Fig. 3 the springback behavior of a bent plate 4 is shown, greatly exaggerated. It is clearly evident that the sheet metal, relieved of the bending force exerted by the punch 1, springs back somewhat with its two legs, so that the bending angle when the sheet is relieved (punch 1 withdrawn) is somewhat larger than the theoretical bending angle in the situation, when the punch presses the sheet 4 completely against the die bottom.
  • the springback rate depends on the sheet thickness and the material of the sheet and can hardly be predicted with the required accuracy.
  • curve 8 The practical bending curve of a piece of sheet metal is shown in FIG. 4 by curve 8, which indicates the relationship between the penetration depth E and the angle W.
  • curve 8 In addition to the thickness tolerance of the curve 8 exert an influence on the course of the curve the yield strength, the modulus of elasticity and the hardening behavior of the piece of sheet metal.
  • this practical bending curve 8 of the piece of sheet metal is first determined by bending a sample sheet piece of a certain thickness and with a certain material quality in a series of tests. A large number of value pairs E / W are recorded, displayed in the form of a curve and saved as a reference curve for the above-mentioned, specific material quality and thickness.
  • the position of the adjustable die base 3 and thus the depth of penetration is set to a value E s which, according to the stored comparison curve 8, should result in the desired angle W s . Then the bending process is started and continued continuously.
  • E5 the effective bending angle W5 is measured and compared with the bending angle W6, which results from the comparison curve 8.
  • the difference W5-W6 shows that the effective bending angle W5 is larger than the theoretically expected bending angle W6.
  • the same procedure is used for the penetration depths E3 and E1:
  • the effective bending angle W3 or W1 is measured and in each case with the assigned bending angle W4 or W2 the curve 8 compared.
  • Based on the determined angle differences W5-W6, W3-W4 and W1-W2 it can be seen that there is a deviating from the comparison curve 8 bending curve 9 for the sheet metal just processed, which is shown in dashed lines in Fig. 4.
  • the course of this curve 9 shows that the actual angle is greater than the expected angle with the same penetration depth. For this reason, the position of the adjustable bottom 3 of the die 2 must be corrected because the target angle will not be reached at the penetration depth E s according to the comparison curve 8, but only at the corrected penetration depth E k .
  • the corrected penetration depth E k ie the corrected position of the bottom 3 of the die, can be determined and set immediately.
  • this can be done, for example, by adding a piece of curve 8 from angle W 1 to the previous, practically determined bending curve 9.
  • the die bottom 3 is set to the new value E k of the penetration depth; all of this takes place while the bending process continues. By the end of the bending process, the actual target angle W s will be reached exactly.
  • this extrapolation of the bending curve 9 takes place on the basis of the known bending curve 8, of course, in a computer-aided control device in which the curve 8 is also stored.
  • the extrapolation is readily permissible, since in practice the deviation of curve 9 from curve 8 is very small and is greatly exaggerated in the drawing for reasons of clarity.
  • the theoretically resulting inaccuracy due to extrapolation of curve 9 on the basis of curve 8 is so small that it can easily be neglected.
  • a further embodiment of the proposed method can consist in that, in addition to the theoretical bending curve, the size and the curve of the force practically required for the deformation of the sheet metal piece are determined on a sample sheet of the same thickness and the same quality and stored as a function of the penetration depth or the deformation angle. It has been shown that with the same depth of penetration of the punch 1, even when using the same die with the same support edges, the angle does not remain the same, but changes as a result of manufacturing tolerances of the sheet, since one sheet has less force and the other sheet has more force needed for bending.
  • the bending punch 1 is made in two parts and consists of an upper part 1a and a lower part 1b, a measuring device 10 being accommodated between the two parts.
  • This measuring device can be designed, for example, as an electrical load cell and is used to measure the pressure exerted on the sheet metal piece 4 by the stamp 1. The measured values are registered and processed in a computer which can act on the adjusting device of the die base.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (5)

  1. Procédé pour plier des tôles à l'aide d'un dispositif plieur comportant un poinçon de formage (1) ainsi qu'une matrice (2) à fond réglable (3), matrice (2) dans laquelle le poinçon de formage (1) pénètre plus ou moins selon l'angle de pliage (W) souhaité, l'angle théorique de pliage étant défini, pour une ouverture constante de matrice, par la position relative du fond de matrice (3) et de l'ouverture de matrice (6-6), caractérisé en ce que, dans une série d'essais effectués avec une certaine qualité de tôle, on détermine d'abord l'angle effectif de pliage (W) en fonction de la profondeur de pénétration (E) du poinçon de formage (1) dans la matrice (2) et on le mémorise sous forme d'une courbe de référence (8), ce après quoi, à l'occasion d'une opération effective de pliage d'autres tôles équivalentes, on mesure l'angle (W₁) de la tôle (4) soumise à contrainte, au moins pour une profondeur de pénétration (E₁ ) lors de l'opération de pliage, et on le compare à l'angle (W₂) correspondant qui ressort de la courbe de référence (8), et en ce que la position du fond de matrice (3) est corrigée en fonction de la différence d'angle (W₁ - W₂) ainsi déterminée, ce après quoi on met en oeuvre l'opération finale de pliage jusqu'à ce qu'on ait atteint la position corrigée du fond (3) de la matrice (2).
  2. Procédé selon la Revendication 1, caractérisé en ce que la mesure de l'angle de pliage (W₁) de la tôle (4) soumise à contrainte et la comparaison avec les angles de pliage (W₂, W₄, W₆) correspondants ressortant de la courbe de référence (8) s'effectuent pour au moins deux et de préférence trois profondeurs de pénétration différentes (E₁, E₃, E₅).
  3. Procédé selon la Revendication 1 ou 2, caractérisé en ce que la dernière mesure de l'angle de pliage (W₁) et la comparaison de ce dernier avec l'angle (W₂) ressortant de la courbe de référence (8) s'effectuent, au cours de l'opération de pliage proprement dite, suffisamment avant d'atteindre l'angle de pliage de consigne (Ws) pour qu'il reste suffisamment de temps pour la correction de la position du fond de matrice (3).
  4. Procédé selon l'une des Revendications 1 à 3, caractérisé en ce que la valeur de correction correspondant au réglage du fond de matrice (3) est déterminée par extrapolation des différences mesurées entre les angles, sur la base de la courbe de référence mémorisée (8).
  5. Procédé selon l'une des Revendications 1 à 4, caractérisé en ce qu'on détermine, outre la courbe de référence (8) correspondant au pliage, l'intensité et les variations de la force de pliage nécessaire à une déformation de la tôle modèle (4), et qu'on les mémorise, en fonction de la profondeur de pénétration du poinçon de formage (1) ou de l'angle de pliage (W), sous forme d'une autre courbe de référence (11), ce après quoi on compare la courbe effective de variation de la force lors du pliage d'autres tôles (4) équivalentes à la courbe mémorisée des variations de la force, les différences constatées étant utilisées pour corriger effectivement la position du fond de matrice (3).
EP89810322A 1988-05-03 1989-04-28 Procédé de pliage de tôle Expired - Lifetime EP0341211B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1140/88 1988-05-03
AT0114088A AT389829B (de) 1988-05-03 1988-05-03 Verfahren zum biegen von blechstuecken mit hilfe einer biegeeinrichtung

Publications (3)

Publication Number Publication Date
EP0341211A2 EP0341211A2 (fr) 1989-11-08
EP0341211A3 EP0341211A3 (en) 1990-10-24
EP0341211B1 true EP0341211B1 (fr) 1993-04-14

Family

ID=3507465

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810322A Expired - Lifetime EP0341211B1 (fr) 1988-05-03 1989-04-28 Procédé de pliage de tôle

Country Status (6)

Country Link
US (1) US4962654A (fr)
EP (1) EP0341211B1 (fr)
JP (1) JP2556994B2 (fr)
AT (2) AT389829B (fr)
DE (1) DE58904039D1 (fr)
ES (1) ES2039935T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010009811A1 (de) * 2010-03-02 2011-09-08 Mtu Aero Engines Gmbh Biegevorrichtung zum Biegen einer Schaufel eines Schaufelrings

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US5148693A (en) * 1989-11-14 1992-09-22 Amada Company, Limited Method and a device for detecting folding angles of a metal sheet during the folding and a method for folding of a metal sheet
SE505985C2 (sv) * 1989-11-14 1997-10-27 Amada Co Ltd Sätt och anordning för avkänning av bockningsvinklar för en metallplåt under bockningen
DE59106253D1 (de) * 1990-05-31 1995-09-21 Siemens Ag Verfahren zum Betrieb einer Presse.
BE1007424A5 (nl) * 1993-08-27 1995-06-13 Lvd Co Adaptief plooien.
US5572896A (en) * 1994-02-25 1996-11-12 Aluminum Company Of America Strain path control in forming processes
US5969973A (en) * 1994-11-09 1999-10-19 Amada Company, Ltd. Intelligent system for generating and executing a sheet metal bending plan
JP4221061B2 (ja) 1994-11-09 2009-02-12 株式会社アマダ 板金曲げ計画の作成・実行用知能システム
EP1236546A3 (fr) * 1994-11-09 2002-12-11 Amada Company, Ltd. Procédé et appareil pour contrôler un dispositif de préhension
US5835684A (en) * 1994-11-09 1998-11-10 Amada Company, Ltd. Method for planning/controlling robot motion
US5761940A (en) 1994-11-09 1998-06-09 Amada Company, Ltd. Methods and apparatuses for backgaging and sensor-based control of bending operations
US5729462A (en) * 1995-08-25 1998-03-17 Northrop Grumman Corporation Method and apparatus for constructing a complex tool surface for use in an age forming process
IT1311827B1 (it) * 1999-04-16 2002-03-19 Luciano Gasparini Forchetta a forcella del tipo basculante autocentrante,particolarmente per la misurazione su quattro punti dell'angolo di
US7089802B2 (en) * 2003-09-05 2006-08-15 The Boeing Company Method and apparatus for determining hydrogen embrittlement
US7330338B1 (en) 2004-05-05 2008-02-12 Hutchinson Technology Incorporated Method for adjusting pitch and roll in a head suspension
DE102005012384A1 (de) 2005-03-17 2006-07-13 Siemens Ag Verfahren zum Freibiegen
DE102006014093A1 (de) * 2006-03-24 2007-09-27 Kleiner, Matthias, Prof. Dr.-Ing. Verfahren und Biegevorrichtung zum Biegen von flächigen metallischen Werkstücken
PT1961502E (pt) 2007-02-23 2014-11-06 Bystronic Laser Ag Método e dispositivo para a dobragem de peças de trabalho
ES2362764B1 (es) * 2009-10-05 2012-03-06 Abengoa Solar New Technologies, S.A Sistema de soporte de indicador de vac�?o o getter evaporable.
CN103264078B (zh) * 2013-05-06 2016-04-27 上海飞机制造有限公司 一种考虑回弹补偿的数控闸压加工方法
DE102017006218A1 (de) 2017-06-28 2019-01-03 Technische Universität Dortmund Vorrichtung und Verfahren zum Biegen von blechartigen Werkstücken bei gleichzeitiger Druckspannungsüberlagerung
ES2987505T3 (es) * 2018-01-16 2024-11-15 Outokumpu Oy Estructura portante conformada por doblado de un vehículo de pasajeros
CN110026484B (zh) * 2019-04-29 2020-10-09 中电建武汉铁塔有限公司 开合角模具
JP7778042B2 (ja) * 2022-06-24 2025-12-01 三菱電機株式会社 曲げ加工方法
FR3139017B1 (fr) 2022-08-26 2024-07-26 Axone Ind Dispositif de pliage de plats épais jusque 100 mm de large pour obtenir un angle fermé à 30° et un très faible rayon de courbure

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AT381251B (de) * 1984-10-18 1986-09-25 Haemmerle Ag Verfahren zur korrektur des biegewinkels beim blechbiegen mit einem biegestempel
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010009811A1 (de) * 2010-03-02 2011-09-08 Mtu Aero Engines Gmbh Biegevorrichtung zum Biegen einer Schaufel eines Schaufelrings
DE102010009811B4 (de) * 2010-03-02 2013-05-16 Mtu Aero Engines Gmbh Biegevorrichtung zum Biegen einer Schaufel eines Schaufelrings

Also Published As

Publication number Publication date
EP0341211A2 (fr) 1989-11-08
EP0341211A3 (en) 1990-10-24
JP2556994B2 (ja) 1996-11-27
AT389829B (de) 1990-02-12
ATE88117T1 (de) 1993-04-15
US4962654A (en) 1990-10-16
ES2039935T3 (es) 1993-10-01
ATA114088A (de) 1989-07-15
JPH02142620A (ja) 1990-05-31
DE58904039D1 (de) 1993-05-19

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