EP0108718B1 - Verfahren zum Biegen eines Bleches mit Hilfe einer Abkantpresse - Google Patents

Verfahren zum Biegen eines Bleches mit Hilfe einer Abkantpresse Download PDF

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Publication number
EP0108718B1
EP0108718B1 EP83810486A EP83810486A EP0108718B1 EP 0108718 B1 EP0108718 B1 EP 0108718B1 EP 83810486 A EP83810486 A EP 83810486A EP 83810486 A EP83810486 A EP 83810486A EP 0108718 B1 EP0108718 B1 EP 0108718B1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
thickness
punch
pick
die
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
Application number
EP83810486A
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English (en)
French (fr)
Other versions
EP0108718A3 (en
EP0108718A2 (de
Inventor
Jean-Daniel Aubert
André Fornerod
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.)
Cybelec SA
Original Assignee
Cybelec SA
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 Cybelec SA filed Critical Cybelec SA
Publication of EP0108718A2 publication Critical patent/EP0108718A2/de
Publication of EP0108718A3 publication Critical patent/EP0108718A3/fr
Application granted granted Critical
Publication of EP0108718B1 publication Critical patent/EP0108718B1/de
Expired 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
    • B21D5/006—Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends
    • 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 invention relates to a method of bending a sheet using a press brake during which the thickness of the sheet is determined and the stroke of the punch is adapted to the thickness of the sheet.
  • the precision of the folding angle obtained essentially depends on the precision of the two elements present, namely that of the press and that of the material to be folded.
  • the precision of the two elements present namely that of the press and that of the material to be folded.
  • sheets of the same dimensions although belonging to the same batch, have thickness differences due to manufacturing tolerances and that this thickness can vary in very appreciable proportions (up to 10%) d 'one sheet to another.
  • the thickness of a sheet can vary from one place to another thereof.
  • the sheets may have undulations or deformations.
  • the stroke of the punch is therefore primarily determined by the thickness of the sheet to be bent. If we just set the press for the average thickness of a batch of sheets, the value of the folding angle obtained will present significant differences from one sheet to another which will in most cases be unacceptable. In order to avoid this dispersion, it is necessary to measure the thickness of each sheet very precisely before folding.
  • the known methods involve an operator who, using a suitable measuring device, determines the thickness of the sheet which will control the stroke of the punch. But this operation requires time and will lengthen the duration of the folding cycle very appreciably.
  • the object of the invention is to automatically determine the thickness of the sheet to be bent during the bending cycle itself and to take it into account to immediately modify the stroke that the punch must perform in order to obtain the desired bending angle. , and this without interrupting the folding movement. It is therefore a question, during the folding cycle, and without lengthening the cycle time, of determining the thickness of the sheet, of transmitting this value to an analysis center which compares it to the programmed value of the thickness and determines, on this basis, the variation of the stroke of the punch, then orders a modification of this stroke even before the folding cycle is finished.
  • the present invention relates to a method of folding a sheet using a press brake as defined in claim 1.
  • the invention also relates to a device for implementing the method as defined in claim 3.
  • the advantages of the process resulting from the present invention are obvious. Knowing very precisely the thickness of the sheet to be folded, at the very place of folding, the central analysis unit determines, in a time significantly less than that of the descent of the punch, the exact stroke that the punch must perform and gives the press control, without the operator having to intervene. In addition, this method makes it possible to greatly reduce the influence of the differences in thickness that a sheet can have from one point to another thereof, as well as that of any corrugations or other defects of this sheet.
  • the process described in fig. 2 consists in determining the thickness of the sheet by measuring the difference between the position of the end of the punch and the upper surface of the matrix on which the sheet rests, when the part b of the sheet lifts, c that is to say when the lower surface of this part of the sheet is no longer in contact with the upper surface of the matrix. It is then a question of taking into consideration the measurement of this difference by a central analysis which will determine exactly the distance that the punch must travel to obtain the desired folding angle, taking into account the thickness sheet metal.
  • sheet metal used here must be understood in its broadest sense, that is to say that of any material to be bent, whatever its material.
  • An example of a device allowing the implementation of this method consists in placing sensors 1 at the level of the upper surface of the matrix 2, on the matrix itself or preferably on a bar 3 which is fixed on the side of the matrix so that the sensors are located at the top surface of the matrix.
  • a bar 3 which is fixed on the side of the matrix so that the sensors are located at the top surface of the matrix.
  • two bars 3, 3 'located on either side of the matrix there are shown two bars 3, 3 'located on either side of the matrix. It should be noted that the device can also operate quite satisfactorily with a single bar. These sensors are intended to determine the moment of loss of contact between the lower surface of the sheet and the upper surface of the matrix when the sheet 4 lifts.
  • a digital control device 5 programmed to determine in a very short time the value ⁇ D of the correction of the stroke of the punch 6 as a function of the difference between the measured thickness of the sheet and the thickness initially programmed.
  • This device works as follows: the measurement zone formed by the sensors 1 is unlocked when the lower end of the punch is at a distance equal to twice the programmed thickness of the sheet relative to the surface top of the matrix. At this time, depending on its size, the sheet 4 covers a greater or lesser number of sensors 1, which are then put into action. When the punch reaches the surface of the sheet, part b thereof begins to lift. However, the sensors will not be released immediately.
  • the AY correction to be made to the depth of the punch stroke which will be determined by numerical control, can be calculated, for example, using the following formula: where: a represents the value of the desired folding angle.
  • This correction is then automatically controlled by the press by digital control.
  • any material detection device can be used with or without contact, such as inductive, capacitive, laser, ultrasonic, etc. sensors.
  • the sheet undergoes decompression (which is called “SPRING BACK •) which causes a variation in the folding angle.
  • SPRING BACK • decompression
  • the value of this variation can be predicted with fairly high precision, which makes it possible to take it into account already during the initial programming of the digital control.
  • sensors with a wide measurement range, such as proportional voltage sensors, and provided that sensors are installed on each side of the matrix, the device described above still makes it possible to control the bending angle, either during the folding cycle itself, or after decompression, the sensors making it possible to identify the position of the points of the sheet located at the right of these. Knowing then the position of the punch, as well as the actual thickness of the sheet, the bending angle can easily be calculated.
  • Such a control naturally requires prior recording in the digital control of the response curve of the sensors.
  • the sensors are photoelectric cells arranged at the ends of the matrix or of the bars 3, 3 ′ and whose horizontal beam and parallel to the upper surface of the matrix is restored at the time where the sheet metal lifts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (11)

1. Verfahren zum Biegen eines Bleches (4) mit Hilfe einer Abkantpresse im Verlauf dessen die Dicke des Bleches bestimmt wird und der Hubweg des Stempels (6) an die Dicke des Bleches angepaßt wird, dadurch gekennzeichnet, daß die Dicke des Bleches zum Zeitpunkt der Kontaktaufhebung zwischen der unteren Fläche des Bleches und der oberen Fläche der Matrize bestimmt wird, indem die Differenz zwischen der Stellung des unteren Arbeitsendes des Stempels und der Stellung der oberen Fläche der Matrize gemessen wird und daß die Anpassung des Hubweges des Stempels an die Dicke des Bleches kontinuierlich erfolgt, ohne Unterbrechung der Biegebewegung, wobei die Presse eine Anordnung (5) zur kontinuierlichen Steuerung des Hubweges des Stempels aufweist, die mit einer Anordnung (8) zur Messung der Dicke des Bleches verbunden ist.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Dicke des Bleches bestimmt wird unter Berücksichtigung des Anfangs-Biegewinkels zum Zeitpunkt der Kontaktaufhebung zwischen der unteren Fläche des Bleches und der oberen Fläche der Matrize.
3. Vorrichtung zur Durchführung des Biegeverfahrens eines Bleches (4) mittels einer Abkantpresse im Verlauf dessen die Dicke des Blechesmittels einer Meßanordnung (8) für die Dicke des Bleches bestimmt wird und die Hubbewegung des Stempels (6) an die Dicke des Bleches angepaßt wird, nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß sie wenigstens einen Fühler (1) aufweist, der auf Höhe der oberen Fläche der Matrize angeordnet ist um den Zeitpunkt der Kontaktaufhebung zwischen der unteren Fläche des Bleches und der oberen Fläche der Matrize zu bestimmen und daß sie eine Anordnung (5) zur kontinuierlichen Steuerung des Hubweges des Stempels (6) aufweist, die mit der Anordnung (8) zur Messung der Dicke des Bleches verbunden ist.
4. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Fühler von wenigstens einer an der Seite der Matrize angeordneten Stange getragen sind.
5. Vorrichtung nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, daß die Anordnung (8) aus wenigstens einer digitalen Meßeinrichtung besteht, die an der Seite der Presse angeordnet ist.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Vorrichtung zur kontinuierlichen Steuerung des Hubweges des Stempels aus einer numerischen Steuerung (5) besteht.
7. Vorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß die Fühler (1) berührungsfreie Meßsysteme sind.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Fühler (1) Induktionsfühler sind.
9. Vorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß die Fühler an den Enden der Matrize (2) angeordnet sind und daß die Fühler fotoelektrische Zellen mit waagrecht und parallel zur oberen Fläche der Matrize verlaufenden Strahlen sind.
10. Vorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß die Fühler (1) mit Berührung arbeitende Meßsysteme sind.
11. Vorrichtung nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, daß die Fühler (1) Proportional-Spannungsfühler sind, die beidseits der Matrize derart angeordnet sind, und so ausgebildet sind, dass sie die Lage der Punkte des Bleches bestimmen, die im rechten Winkel zu ihnen liegen.
EP83810486A 1982-11-05 1983-10-21 Verfahren zum Biegen eines Bleches mit Hilfe einer Abkantpresse Expired EP0108718B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6440/82 1982-11-05
CH6440/82A CH651767A5 (fr) 1982-11-05 1982-11-05 Procede de pliage d'une tole a l'aide d'une presse plieuse.

Publications (3)

Publication Number Publication Date
EP0108718A2 EP0108718A2 (de) 1984-05-16
EP0108718A3 EP0108718A3 (en) 1984-08-15
EP0108718B1 true EP0108718B1 (de) 1987-07-08

Family

ID=4309662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83810486A Expired EP0108718B1 (de) 1982-11-05 1983-10-21 Verfahren zum Biegen eines Bleches mit Hilfe einer Abkantpresse

Country Status (4)

Country Link
US (1) US4550586A (de)
EP (1) EP0108718B1 (de)
CH (1) CH651767A5 (de)
DE (1) DE3372326D1 (de)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819467A (en) * 1986-09-17 1989-04-11 Cincinnati Incorporated Adaptive control system for hydraulic press brake
BE1001412A5 (nl) * 1987-09-28 1989-10-24 Lvd Co Plaatdiktemeettoestel voor een plaatpers.
JPH0230326A (ja) * 1988-07-19 1990-01-31 Yamazaki Mazak Corp ワーク計測手段付きプレスブレーキ及びそのワーク計測方法
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
JP2520368B2 (ja) * 1993-07-30 1996-07-31 株式会社東洋工機 曲げ加工方法およびその装置
BE1007424A5 (nl) * 1993-08-27 1995-06-13 Lvd Co Adaptief plooien.
WO1996001706A1 (fr) * 1994-07-08 1996-01-25 Amada Company, Limited Procede de cintrage a l'aide d'une machine a cintrer, et machine a cintrer utilisee dans ce procede
JP4750940B2 (ja) * 2000-12-08 2011-08-17 株式会社アマダエンジニアリングセンター 板金加工システムに用いるブランク加工装置、ワーク板厚測定装置、スプリングバック測定装置
EP1258298B1 (de) * 2000-01-17 2008-04-23 Amada Company, Ltd. Messeinrichtung für eine, einen Zuschnitt bearbeitende Maschine
ATE293500T1 (de) 2000-01-24 2005-05-15 Bystronic Laser Ag Verfahren zum steuern des hubes einer biegepresse
CN1286590C (zh) * 2001-03-16 2006-11-29 拜斯洛尼激光股份公司 用来调节压弯机行程的方法
US8692877B2 (en) * 2005-06-20 2014-04-08 Lazer Safe Pty Ltd Imaging and safety system and method for an industrial machine
AT508357B1 (de) 2009-06-29 2011-01-15 Trumpf Maschinen Austria Gmbh Verfahren und vorrichtung zum laserunterstützten biegen von werkstücken
AT508356B1 (de) * 2009-06-29 2011-01-15 Trumpf Maschinen Austria Gmbh Vorrichtung und verfahren zum biegen eines werkstücks
AT508355B1 (de) * 2009-06-29 2011-01-15 Trumpf Maschinen Austria Gmbh Verfahren und vorrichtung zum biegen eines werkstücks
CN104624726B (zh) * 2014-12-24 2016-08-24 广东中南声像灯光设计研究院 基于plc的x光厚度检测与折弯速度调节的折弯机及其折弯加工方法
CN104965488A (zh) * 2015-06-26 2015-10-07 苏州边桐传感科技有限公司 基于裂纹检测反馈与扭矩调节的钣金折弯系统及方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1425315A (fr) * 1964-10-14 1966-01-24 Promecan Sisson Lehmann Perfectionnements aux outils de pliage
FR93502E (fr) * 1964-10-14 1969-04-11 Promecan Sisson Lehmann Perfectionnement aux outils de pliage.
DE2901376B2 (de) * 1979-01-15 1980-10-30 Karl Mengele & Soehne Maschinenfabrik Und Eisengiesserei Gmbh & Co, 8870 Guenzburg Steuereinrichtung an Freibiegemaschinen

Also Published As

Publication number Publication date
EP0108718A3 (en) 1984-08-15
EP0108718A2 (de) 1984-05-16
US4550586A (en) 1985-11-05
CH651767A5 (fr) 1985-10-15
DE3372326D1 (en) 1987-08-13

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