EP0155228A1 - Presse pour le pliage de tôles, dont le dispositif de pliage permet un contrôle de l'angle de pliage - Google Patents

Presse pour le pliage de tôles, dont le dispositif de pliage permet un contrôle de l'angle de pliage Download PDF

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Publication number
EP0155228A1
EP0155228A1 EP85810020A EP85810020A EP0155228A1 EP 0155228 A1 EP0155228 A1 EP 0155228A1 EP 85810020 A EP85810020 A EP 85810020A EP 85810020 A EP85810020 A EP 85810020A EP 0155228 A1 EP0155228 A1 EP 0155228A1
Authority
EP
European Patent Office
Prior art keywords
folding
angle
sheet
bars
measuring
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.)
Withdrawn
Application number
EP85810020A
Other languages
German (de)
English (en)
French (fr)
Inventor
Willem Dieperink
Arend Vruggink
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.)
Beyeler Machines SA
Original Assignee
Beyeler Machines 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 Beyeler Machines SA filed Critical Beyeler Machines SA
Publication of EP0155228A1 publication Critical patent/EP0155228A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • B21D5/0272—Deflection compensating means
    • 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 press for bending sheet metal, the folding device of which allows continuous control of the bending angle of the sheet metal to be bent.
  • the folding angle obtained can exhibit significant variations along the folding line.
  • the causes of these differences in folding angle are mainly due to the following factors: deformations appearing in the press at the time of folding, in particular deformations of the upper apron and deformations of the lower apron, deformations of the amounts of the press and of the tooling, tolerances in the construction of the machine and the tools, wear of the tools, quality of the sheets, and in particular tolerances in the thickness of the sheets.
  • the characteristics of two apparently similar sheets are not always strictly identical, which means that, for the same movement of the tool, it can result in substantially different bending angles for these two sheets.
  • presses of the kind described above require numerous tests and adjustments and, for the most part, oblige the user to predetermine the deformation due to the work of the press.
  • these presses only compensate for the angle differences due to deformations of the machine, the uprights and the upper and lower aprons, but not the other differences, due for example to local deformations of the die or the punch. or the wear of these.
  • these presses do not make it possible to solve the problem of obtaining a constant precision of the bending angle from one sheet to another. Indeed, from one batch of sheets to another, and even for the same batch of sheets, the characteristics of the sheets, in particular their thickness, their resistance or their elasticity, are not always strictly identical from one sheet to another .
  • Presses which make it possible to measure the folding angle during the folding cycle. These are, for example, presses described in patent applications FR 2 362 722, DE 2 044 199 and in US patent 3,440,847.
  • the control devices described in the above patents are not very precise. In fact, their arrangement is such that they measure the folding angle outside the die, which generally results in a significant error due to the weight of the sheet.
  • a more precise measurement of the folding angle is obtained with the device described in patent application GB 2 072 551, which makes it possible to measure the angle at the location of the folding, in the matrix.
  • this device does not allow a correct measurement in the case of asymmetrical folding which occurs, for example, when the sheet is folded near one of its edges, one of the two sides of the sheet then being significantly more heavy than the other.
  • a control device allowing a more precise measurement of the bending angle is described in the German utility model G 82 34 901.0, which relates to a small press for bending metal profiles.
  • the folding angle is determined at the location of the folding using two measuring bars, each having a flat surface on which the profile rests during folding, these bars being arranged so as to undergo rotation during folding.
  • Measuring bars of similar shape can advantageously be used in a device for controlling the bending angle of the presses for bending sheets.
  • the object of the present invention is to provide a press for bending sheets, which allows continuous and automatic control of the bending angle of the sheet and which allows to obtain automatically and with very high precision the imposed bending angle, the bending angle being obtained constant over the entire length of the sheet.
  • the present invention relates to a press for bending sheets, as defined in claim 1.
  • the invention also relates to a method of actuating the press, as defined in claim 10.
  • the press comprises an upper apron 1 and a lower apron 2.
  • the upper apron supports a punch 3 and the lower apron a tool holder 4.
  • the upper apron is provided with two jacks 17, 17 'intended to set the punch in motion 3.
  • Displacement means 5 are located in a slot made in the lower deck. They are intended to remedy the defects inherent in the folding process listed above, such as deformations appearing in the press at the time of folding, the quality of the sheets, etc.
  • the sheet bending angle control device comprises two pairs of measuring bars 6, 6 'and a series of pairs of measuring bars 16, 16', each of the bars 6, 6 'and 16, 16' being of round section and longitudinally truncated so as to present a flat upper surface 7, the two bars of a couple being housed side by side in a housing arranged on the surface of the tool holder 4, the two pairs of measuring bars 6 , 6 'being arranged respectively above the uprights 18, 18' of the press, the pairs of bars 16, 16 'being arranged above the displacement means 5, so that each displacement means 5 corresponds to a pair of measuring bars 16, 16 '.
  • the pairs of measuring bars are arranged end to end, so that the flat surfaces 7 constitute two continuous surfaces.
  • Each measuring bar is integral with a measuring device 8 intended to measure the angle of rotation of the bar.
  • each measuring device 8 consists of two potentiometers, each of them being arranged inside one of the two bars 6, 6 'or 16, 16'.
  • the control device further comprises a control device 9 connected to the various measurement devices 8, to control means 13, 13 ′ of the jacks 17, 17 ′ for actuating the movement of the punch 3 as well as to means of control 15 of the displacement means 5.
  • the control of the folding angle of the sheet to be folded 10 is carried out as follows: at the start of the folding operation, the sheet is put in place so that its surface lower is in contact with the flat surfaces 7 of the measuring bars.
  • the value of the imposed folding angle is indicated at a control station 11.
  • the entire folding operation will then be carried out continuously and automatically, without requiring the intervention of an operator.
  • the measuring bars when the sheet 10 begins to bend under the force due to the punch 3, the measuring bars, the flat rectified surfaces of which 7 remain in close contact with the lower surface of the sheet, will undergo a rotation whose angle will be measured by the measuring devices 8, the angles of rotation a and measured absolutely for each of the two bars 6, 6 'or 16, 16' of a pair of bars being added by the control device 9, so as to determine the instantaneous local folding angle y of the sheet.
  • the control device 9 is arranged so as to be able to compare the various instantaneous local values of the folding angle and to control the actuation of one or more displacement means 5, so as to standardize the folding angle over the entire length of the sheet and to control the continuation of the movement of the punch 3 via the control means 13, 13 'of the jacks 17, 17', so as to continue the folding operation without interruption, the same process repeating continuously and automatically until the required and constant bending angle is obtained along the entire length of the sheet.
  • the control device is arranged so that the thrusts exerted by each of the jacks 17, 17 'can be different.
  • the comparison between them of the measured local values of the folding angle is carried out by electronic means 14, electronic means 12 making it possible to compare these values with the angle of imposed folding, the control means 13, 13 'of the jacks 17, 17' are constituted by servo-valves, the control means 15 of the displacement means 5 being constituted by pressure valves or servo-valves, in number equal to that of the displacement means 5.
  • the punch stroke is imposed, which must be determined beforehand.
  • the stroke of the punch being controlled continuously by the control device 9, until the angle of imposed folding, this angle being obtained with very high precision, and constant over the entire length of the sheet.
  • the folding process no longer requiring operator intervention at any time, and the folding operation taking place without apparent interruption of the folding movement, this results in an appreciable saving of time.
  • the problem of the variation of the folding angle which can occur after the end of the folding movement, when an expansion of the sheet occurs, is easily solved with the present press.
  • the control device 9 controls the automatic discharge of the force applied to the punch. If a change in the bending angle is detected (due to the sheet metal relaxing), the bending process resumes bending to a bending angle less than the imposed value, so as to take account of the new planned relaxation of the sheet, the process repeating until the required bending angle is obtained.
  • the measuring bars are arranged in a housing arranged on the surface of the tool holder. According to another variant of the press, the measuring bars are arranged in a housing directly arranged in the apron, the tool holder 4 being absent. In the variant described, the measuring bars are arranged so as to be integral with the lower bulkhead. In another variant, the functions of the two aprons are reversed and the measuring bars are arranged in the upper apron or on the surface of a tool holder supported by the upper apron, the punch being integral with the lower apron.
  • the displacement means 5 are arranged in the lower deck. Of course, it is also possible to arrange them in the upper deck or to arrange them in each of the upper and lower decks. In particular, the displacement means 5 can be arranged inside a slot arranged in one of the aprons.
  • the lower apron consists of two parts, the first part constituting a support apron supporting the displacement means 5, which support one or more flexible aprons on the surface of which are housed the pairs of measuring bars.
  • the folding device comprises five displacement means 5, opposite which are arranged respectively five pairs of measuring bars 16, 16 '.
  • All the operations of the folding cycle including in particular the work of the control device 9 for controlling the actuation of the displacement means 5 and of the devices for controlling the movement of the punch are carried out automatically until very precise bending angle imposed.
  • the presses according to the invention have many advantages. Indeed, the combination of the displacement means 5 and the pairs of measuring bars associated with the control means 9 makes it possible to eliminate, on the one hand, the differences in bending angle due, for the same sheet, to one any of the deformations seen above, whether the deformations of the machine, the uprights, the upper or lower aprons, the die or the punch, or to the sheet thickness tolerances, and, on the other On the other hand, the differences in bending angle from one sheet to another, due to the differences in thickness, resistance and elasticity of the sheets.
  • the presses according to the invention make it possible to remedy the drawbacks of asymmetric folding and those due to a non-parallel movement of the punch. In the latter case, the folding angle will be obtained constant over the entire length of the folding, even for thin sheets, provided that they are positioned so that they rest on at least two pairs of measuring bars .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
EP85810020A 1984-02-03 1985-01-22 Presse pour le pliage de tôles, dont le dispositif de pliage permet un contrôle de l'angle de pliage Withdrawn EP0155228A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH504/84A CH654761A5 (fr) 1984-02-03 1984-02-03 Presse-plieuse dont le dispositif de pliage permet un controle continu de l'angle de pliage de la piece a plier.
CH504/84 1984-03-02

Publications (1)

Publication Number Publication Date
EP0155228A1 true EP0155228A1 (fr) 1985-09-18

Family

ID=4188514

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810020A Withdrawn EP0155228A1 (fr) 1984-02-03 1985-01-22 Presse pour le pliage de tôles, dont le dispositif de pliage permet un contrôle de l'angle de pliage

Country Status (4)

Country Link
US (1) US4640113A (ja)
EP (1) EP0155228A1 (ja)
JP (1) JPS60180622A (ja)
CH (1) CH654761A5 (ja)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9213532U1 (de) * 1992-10-07 1993-01-28 Haberstock, Rolf, 7897 Küssaberg Biegevorrichtung zum Biegen von Blechteilen
GB2226515B (en) * 1988-12-29 1993-06-02 Amada Co Ltd Sheet workpiece bending machine
US5295384A (en) * 1990-03-15 1994-03-22 Lift Verkaufsgerate Gesellschaft M.B.H. Sheet-metal bending device
EP0594532A1 (fr) * 1992-10-20 1994-04-27 Beyeler Machines S.A. Dispositif de mesure de l'angle de pliage d'une tôle
US5515706A (en) * 1994-08-22 1996-05-14 Paul; David R. Angle bender & method
NL1004820C2 (nl) * 1996-12-18 1997-12-23 Delem B V Werkwijze voor het besturen van een buigpers en buigpers voorzien van besturingsmiddelen voor het besturen van de buigpers volgens de werkwijze.
WO1998056518A1 (en) * 1997-06-13 1998-12-17 Luciano Gasparini Device to automatically adapt the bending pressure, proportionally to the working pressure of the cylinders of the upper cross-piece, particularly in a press-bending machine and a machine so obtained
EP0940196A1 (en) * 1996-10-29 1999-09-08 Komatsu Ltd. Bending angle correction method and press brake made using the same

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US4819467A (en) * 1986-09-17 1989-04-11 Cincinnati Incorporated Adaptive control system for hydraulic press brake
US4797831A (en) * 1986-11-18 1989-01-10 Cincinnati Incorporated Apparatus for synchronizing cylinder position in a multiple cylinder hydraulic press brake
US4864509A (en) * 1987-09-29 1989-09-05 The Boeing Company Method and related apparatus for controlling the operation of a press brake
US5067340A (en) * 1988-05-05 1991-11-26 Macgregor Donald C Precision press brake
US5062283A (en) * 1988-07-19 1991-11-05 Yamazaki Mazak Kabushiki Kaisha Press brake and a workpiece measuring method in the press brake
GB8822608D0 (en) * 1988-09-27 1988-11-02 Wilson Ian Technology Leaf spring production
EP0379886B1 (de) * 1989-01-18 1993-05-12 Rolf Haberstock Gesenkvorrichtung
JPH087932Y2 (ja) * 1989-07-31 1996-03-06 株式会社小松製作所 曲げ機械の工具位置制御装置
JPH087933Y2 (ja) * 1989-11-24 1996-03-06 株式会社アマダ 折曲げ機
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
EP0752290B1 (en) * 1994-03-29 2001-10-24 Komatsu Ltd. Automatic mold bending corner depth amount compensating method
CN1068253C (zh) * 1994-07-08 2001-07-11 阿曼德有限公司 弯板机
DE69529607T2 (de) 1994-11-09 2003-09-18 Amada Co., Ltd. Intelligentes system zur herstellung und ausführung eines metallplattenbiegeplans
US5835684A (en) 1994-11-09 1998-11-10 Amada Company, Ltd. Method for planning/controlling robot motion
EP0738200B1 (en) * 1994-11-09 2003-02-12 Amada Company Limited Shear force sensing system
US5969973A (en) * 1994-11-09 1999-10-19 Amada Company, Ltd. Intelligent system for generating and executing a sheet metal bending plan
US5761940A (en) * 1994-11-09 1998-06-09 Amada Company, Ltd. Methods and apparatuses for backgaging and sensor-based control of bending operations
WO1998014286A1 (fr) * 1996-10-03 1998-04-09 Komatsu Ltd. Procede de cintrage et dispositif de cintrage pour machine a cintrer
IT1293174B1 (it) * 1997-04-11 1999-02-12 Luciano Gasparini Procedimento di presso-piegatura della lamiera metallica con sistema di misurazione diretta comprendente una funzione di compensazione e
DE69710101T2 (de) * 1997-06-20 2002-08-29 Luciano Gasparini Biegepresse
US5966974A (en) * 1998-05-19 1999-10-19 Sds Usa, Inc. Automatic learning apparatus for folding machine
US6055737A (en) * 1998-06-11 2000-05-02 Sweaney; Scylvester L. Quick mount angle measurement gauge
SE518599C2 (sv) * 1998-06-26 2002-10-29 Pullmax Ursviken Ab Anordning för vinkelmätning
DE60009897T2 (de) * 1999-05-17 2005-03-17 Cornelis Hendricus Liet Verfahren und vorrichtung zum biegen von werkstücken
NL1012072C2 (nl) * 1999-05-17 2000-11-20 Cornelis Hendricus Liet Werkwijze en inrichting voor het buigen van werkstukken.
FR2796320B1 (fr) * 1999-07-13 2001-10-05 Amada Europ Sa Presse plieuse a precision amelioree
KR100519521B1 (ko) * 1999-10-07 2005-10-05 무라타 기카이 가부시키가이샤 굽힘기계 및 그 운전방법
JP4489916B2 (ja) * 2000-07-31 2010-06-23 株式会社アマダ電子 曲げ加工機
JP4683698B2 (ja) * 2000-09-06 2011-05-18 株式会社アマダ電子 曲げ加工方法及びその装置
JP4637396B2 (ja) * 2001-04-12 2011-02-23 株式会社アミテック 角度測定器
DE20203583U1 (de) * 2002-03-06 2002-08-29 Rasi Maschinenbau u. -handels-GmbH, 75428 Illingen Vorrichtung zur Erfassung eines Richtungswinkels, insbesondere eines Biegewinkels, eines Werkstücks, insbesondere eines Biegeteils
ITPR20030012A1 (it) * 2003-02-18 2004-08-19 Fim Spa Tavola supplementare porta utensile per compensare
JP4720433B2 (ja) * 2005-10-31 2011-07-13 トヨタ紡織株式会社 車両用暖房装置の取付構造
CN102708222B (zh) * 2006-08-31 2014-11-26 新日铁住金株式会社 回弹发生原因特定方法、回弹发生原因部位特定方法、回弹对策位置特定方法以及它们的装置
ITMI20110977A1 (it) 2011-05-30 2012-12-01 Finn Power Italia S R L Pressa piegatrice
DK3147643T3 (en) * 2015-09-28 2019-04-29 Ssab Technology Ab PROCEDURE AND COMPUTER PROGRAM PRODUCT
CN106424228B (zh) * 2016-11-02 2018-08-21 无锡先导智能装备股份有限公司 用于半片电池片焊接的焊带折弯机构
EP3839676A1 (en) 2019-12-16 2021-06-23 Bystronic Laser AG Thickness compensation in a cutting and bending process
CN114393067B (zh) * 2022-01-04 2023-12-22 歌尔科技有限公司 冲压机床的智能监测方法和计算机可读存储介质

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Publication number Priority date Publication date Assignee Title
US3440847A (en) * 1964-10-14 1969-04-29 Promecan Sisson Lehmann Bending machine
DE2044199A1 (en) * 1970-09-07 1972-03-23 Karl Mengele & Söhne Maschinenfabrik und Eisengießerei, 8870 Günzburg Programme controlled sheet metal bending - using open tooling
FR2119528A5 (ja) * 1970-12-25 1972-08-04 Amada Co Ltd
FR2200064A1 (ja) * 1972-09-14 1974-04-19 Piccini Giancarlo
FR2362722A1 (fr) * 1976-08-27 1978-03-24 Promecan Sisson Lehmann Dispositif de controle de l'angle de pliage d'une tole ou similaire sur une presse plieuse
FR2379046A1 (fr) * 1977-02-01 1978-08-25 Selecontrol Sas Dispositif pour mesurer les angles de pliage dans des presses a plier la tole
EP0025469A1 (fr) * 1979-09-17 1981-03-25 Beyeler Machines S.A. Procédé et installation de circuit hydraulique pour la correction de la profondeur de pénétration du poinçon d'une presse-plieuse hydraulique
GB2072551A (en) * 1980-03-07 1981-10-07 Hess J Device for measuring the fold angle in a sheet metal bending press
FR2509222A1 (fr) * 1980-06-11 1983-01-14 Ettore Alagna Presse plieuse hydraulique avec systeme de compensation des deformations elastiques
DE8234901U1 (de) * 1982-12-11 1983-04-21 Ehrt Maschinenbau GmbH, 5340 Bad Honnef Vorrichtung zum biegen von metallprofilen

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Publication number Priority date Publication date Assignee Title
CA585664A (en) * 1959-10-20 A. Johnson Stanley Die for use in blending flat metal stock and the like
DE1427344A1 (de) * 1961-11-18 1968-11-28 Harald Wirth Vorrichtung zum Abwinkeln von Flachschienen
US3156287A (en) * 1961-12-12 1964-11-10 Pines Engineering Co Inc Control means for metal forming apparatus
DE2418668A1 (de) * 1974-04-18 1975-10-30 Egon Evertz Biegemaschine zum biegen von blechen und baendern
US4408471A (en) * 1980-10-29 1983-10-11 Massachusetts Institute Of Technology Press brake having spring-back compensating adaptive control
JPS57202928A (en) * 1981-06-08 1982-12-13 Amada Co Ltd Bender

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Publication number Priority date Publication date Assignee Title
US3440847A (en) * 1964-10-14 1969-04-29 Promecan Sisson Lehmann Bending machine
DE2044199A1 (en) * 1970-09-07 1972-03-23 Karl Mengele & Söhne Maschinenfabrik und Eisengießerei, 8870 Günzburg Programme controlled sheet metal bending - using open tooling
FR2119528A5 (ja) * 1970-12-25 1972-08-04 Amada Co Ltd
FR2200064A1 (ja) * 1972-09-14 1974-04-19 Piccini Giancarlo
FR2362722A1 (fr) * 1976-08-27 1978-03-24 Promecan Sisson Lehmann Dispositif de controle de l'angle de pliage d'une tole ou similaire sur une presse plieuse
FR2379046A1 (fr) * 1977-02-01 1978-08-25 Selecontrol Sas Dispositif pour mesurer les angles de pliage dans des presses a plier la tole
EP0025469A1 (fr) * 1979-09-17 1981-03-25 Beyeler Machines S.A. Procédé et installation de circuit hydraulique pour la correction de la profondeur de pénétration du poinçon d'une presse-plieuse hydraulique
GB2072551A (en) * 1980-03-07 1981-10-07 Hess J Device for measuring the fold angle in a sheet metal bending press
FR2509222A1 (fr) * 1980-06-11 1983-01-14 Ettore Alagna Presse plieuse hydraulique avec systeme de compensation des deformations elastiques
DE8234901U1 (de) * 1982-12-11 1983-04-21 Ehrt Maschinenbau GmbH, 5340 Bad Honnef Vorrichtung zum biegen von metallprofilen

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Title
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 124 (M141)[1002], 9 juillet 1982; & JP - A - 57 50217 (AMADA K.K.) 24-03-1982 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226515B (en) * 1988-12-29 1993-06-02 Amada Co Ltd Sheet workpiece bending machine
US5295384A (en) * 1990-03-15 1994-03-22 Lift Verkaufsgerate Gesellschaft M.B.H. Sheet-metal bending device
DE9213532U1 (de) * 1992-10-07 1993-01-28 Haberstock, Rolf, 7897 Küssaberg Biegevorrichtung zum Biegen von Blechteilen
EP0594532A1 (fr) * 1992-10-20 1994-04-27 Beyeler Machines S.A. Dispositif de mesure de l'angle de pliage d'une tôle
US5375340A (en) * 1992-10-20 1994-12-27 Beyeler Raskin S.A. Measuring device for the bend angle of sheet-metal
US5515706A (en) * 1994-08-22 1996-05-14 Paul; David R. Angle bender & method
EP0940196A1 (en) * 1996-10-29 1999-09-08 Komatsu Ltd. Bending angle correction method and press brake made using the same
EP0940196A4 (en) * 1996-10-29 2000-03-01 Komatsu Mfg Co Ltd BENDING ANGLE CORRECTION PROCESS AND BENDING PRESSURE MADE THIS
NL1004820C2 (nl) * 1996-12-18 1997-12-23 Delem B V Werkwijze voor het besturen van een buigpers en buigpers voorzien van besturingsmiddelen voor het besturen van de buigpers volgens de werkwijze.
WO1998056518A1 (en) * 1997-06-13 1998-12-17 Luciano Gasparini Device to automatically adapt the bending pressure, proportionally to the working pressure of the cylinders of the upper cross-piece, particularly in a press-bending machine and a machine so obtained

Also Published As

Publication number Publication date
JPS60180622A (ja) 1985-09-14
US4640113A (en) 1987-02-03
CH654761A5 (fr) 1986-03-14

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