EP1452302A1 - Verfahren zur Korrigierung eines Biegvorgangs und Biegepresse - Google Patents

Verfahren zur Korrigierung eines Biegvorgangs und Biegepresse Download PDF

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Publication number
EP1452302A1
EP1452302A1 EP03405126A EP03405126A EP1452302A1 EP 1452302 A1 EP1452302 A1 EP 1452302A1 EP 03405126 A EP03405126 A EP 03405126A EP 03405126 A EP03405126 A EP 03405126A EP 1452302 A1 EP1452302 A1 EP 1452302A1
Authority
EP
European Patent Office
Prior art keywords
deck
uprights
dead center
bottom dead
folding
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.)
Granted
Application number
EP03405126A
Other languages
English (en)
French (fr)
Other versions
EP1452302B1 (de
Inventor
Gerrit Gerritsen
Papi Piero
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.)
Bystronic Laser AG
Original Assignee
Bystronic Laser 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
Priority to DE60327042T priority Critical patent/DE60327042D1/de
Application filed by Bystronic Laser AG filed Critical Bystronic Laser AG
Priority to EP03405126A priority patent/EP1452302B1/de
Priority to AT03405126T priority patent/ATE427830T1/de
Priority to US10/546,909 priority patent/US7503200B2/en
Priority to PCT/CH2004/000090 priority patent/WO2004076161A1/fr
Priority to CNA2004800089255A priority patent/CN1767940A/zh
Priority to CA002516998A priority patent/CA2516998A1/en
Publication of EP1452302A1 publication Critical patent/EP1452302A1/de
Application granted granted Critical
Publication of EP1452302B1 publication Critical patent/EP1452302B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
    • B30B15/245—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam using auxiliary cylinder and piston means as actuating members
    • 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 present invention relates to a correction method a folding operation carried out by a press brake of the type comprising a fixed deck, a movable deck, means movement of the movable platform supported by two uprights integral with the fixed bulkhead, sensors, associated respectively to the two uprights, measuring the forces exerted by said means of movement on said uprights, deformation compensation cylinders associated with one of the two aprons, and an electronic commanding device the movement of the movable platform between a top dead center and a bottom dead center.
  • Document CH 653289 also describes another type of hydraulic press, in which both the fixed deck that the movable deck are equipped with compensation cylinders.
  • compensation cylinders it is in principle possible, by means compensation cylinders, not only to make the two parallel aprons but again to bring back the die holder as the punch holder each in a straight line, parallel to each other.
  • such a machine is more expensive to realize, since it must have two antagonistic series of compensating cylinders, one for each apron.
  • the programming of an implementation effective antagonist of the two series of compensating cylinders is very difficult and the operation of such machines is not reliable. They have not met with success in convenient.
  • the object of the invention is therefore to propose a method of correction of simple and efficient folding operation (s), which can be automatically implemented by the command digital press equipped with a single row of cylinders compensation.
  • This goal is achieved by using, in a press brake of the defined input type, a method comprising pre-registration a calibration chart in memory of electronic control device, by means of parts very short calibration times, the abacus establishing a correspondence between the forces measured by the sensors associated with the amounts and pressures applicable to the cylinders compensation of the deck carrying them, to maintain said substantially straight deck, and in which process, during a subsequent folding operation, applied to said pressure compensation cylinders resulting from said abacus, as a function of the forces measured at the level of said sensors.
  • the method of calculating the correction of the bottom dead center preferably takes into account that the part to be bent is a long piece or a short piece.
  • long piece there must hear a piece whose length is substantially equal to the distance between the two amounts of the press.
  • short piece you have to hear a piece whose length does not not exceed one third of the distance between the two uprights.
  • Figs 6a, 6b, 6c, 7b and 7c are representations diagrams illustrating the deformations of the aprons during a folding operation, of the same parts as in the case of Figs 4a to 5c, where simultaneously the bending of the deck and the bottom dead center are fixed.
  • Fig. 1A shows a hydraulic press 1 with a upper movable deck 5, which is moved under the action of pistons and cylinders 6, 6 'associated with lateral uprights 10, 10 '.
  • the movable deck 5 tends to bend under the action of these pistons, the middle of the movable deck 5 then being more higher than both ends.
  • the fixed lower deck 2 would have tends to bend in such a way that the middle of it fixed apron would be lower than the two ends. Under these conditions, the working surfaces of the two decks 2 and 5 and, consequently, the surfaces of the two tool holders, namely the die holder 8 and the punch holder 9, would not more parallel.
  • the deck lower 2 comprises a central plate 3, which carries the matrix holder 8.
  • the central plate 3 is surrounded on the side and on the other side of two reaction plates 4 and 7.
  • the ends sides of the central plate 3 and the reaction plates 4 and 7 are secured respectively to the uprights 10 and 10 '.
  • the lower apron 2 of the press shown in the FIG. 1A has three reaction holes 13, 13 ', 13' ', right through plates 3, 4 and 7.
  • Each hole reaction houses a hydraulic compensation cylinder 14.14 ', 14' ', which rests on reaction plates 4 and 7 and whose piston 11 presses from below at 12 on the plate central 3, as schematically illustrated in FIG. 1B, to provide a surge of compensation to the party upper of the central plate 3 of the lower deck, of so as to compensate for the deformation mentioned above.
  • the plates of reaction 4 and 7 undergo a downward reaction.
  • the invention is equally applicable to this type of machine having more reaction holes than those with a single compensation slot, described for example in
  • Fig. 2c schematically illustrates the curvature of the upper deck during a folding operation of a part whose length L is relatively short compared to the distance 1 between the two uprights of a press.
  • the compensation cylinders act on the lower bulkhead in such a way that its upper edge remains substantially straight.
  • l a and l b respectively denote the distances from the center of the part being bent to each of the two uprights.
  • the resultant F of reactions from the part to the upper apron which corresponds to the load on the part, is applied substantially to the center of the part to be bent.
  • a valid calibration is carried out for a pair of aprons, a pair of tool holders and tools.
  • the calibration operation is carried out using calibration pieces of very short lengths, that is to say of which the length is less than 10% of the length between two jacks, placed in several successive positions between both amounts.
  • the very short part is pressurized between the two aprons and, for a succession of values of F a and F b according to l a / l b , the cylinders of the lower apron are adjusted so that its upper edge is right.
  • the set of values of F a , F b and the values of the pressures of the compensation cylinders thus measured constitutes a calibration chart, which is prerecorded in the memory of the electronic control device.
  • the sensors of the two uprights measure forces F a and F b during bending and the electronic control device actuates the compensation cylinders so that their pressures correspond to the corresponding values in the chart.
  • the lower apron remains substantially straight during the operation for bending short pieces, but has a some residual curvature when bending long pieces.
  • E is the modulus of elasticity (in Nn / mm 2 ) of the upper deck and I denotes the moment of axial inertia (in mm 4 ) of the deck; the values of E and I are determined during the manufacture of the bulkhead and are stored in the memory of the control electronics.
  • the penetration depth of the tool in the matrix is corrected by correcting the position of the bottom dead center by an amount corresponding to the maximum deformation.
  • Another parameter likely to generate an error of the bending angle is the variability of the thickness of the pieces processed. Indeed, the steel sheets supplied by the manufacturers may have thickness variations up to ⁇ 10% of the nominal value. An operation of precise folding must take into account the difference between the actual thickness of the part and the nominal thickness.
  • Several methods have been proposed for this in the state of technique. We can, for example, use the one described in patent No. EP 1120176 of the applicant, according to which this difference is calculated by comparing the position of the movement of the movable platform, at which a predetermined variation of the pressure recorded by the sensors associated with the working cylinders, with the position theoretical of the deck where this variation should occur if the thickness of the piece was strictly equal to its nominal thickness. The position of the bottom dead center is corrected during the folding operation by the electronic device when this measurement has been made.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP03405126A 2003-02-26 2003-02-26 Verfahren zur Korrigierung eines Biegvorgangs und Biegepresse Expired - Lifetime EP1452302B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP03405126A EP1452302B1 (de) 2003-02-26 2003-02-26 Verfahren zur Korrigierung eines Biegvorgangs und Biegepresse
AT03405126T ATE427830T1 (de) 2003-02-26 2003-02-26 Verfahren zur korrigierung eines biegvorgangs und biegepresse
DE60327042T DE60327042D1 (de) 2003-02-26 2003-02-26 Verfahren zur Korrigierung eines Biegvorgangs und Biegepresse
PCT/CH2004/000090 WO2004076161A1 (fr) 2003-02-26 2004-02-19 Procede de correction d'une operation de pliage et presse-plieuse
US10/546,909 US7503200B2 (en) 2003-02-26 2004-02-19 Method for correcting a folding operation and folding press
CNA2004800089255A CN1767940A (zh) 2003-02-26 2004-02-19 校正弯折作业的方法和压力弯折机
CA002516998A CA2516998A1 (en) 2003-02-26 2004-02-19 Method for correcting a folding operation and folding press

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03405126A EP1452302B1 (de) 2003-02-26 2003-02-26 Verfahren zur Korrigierung eines Biegvorgangs und Biegepresse

Publications (2)

Publication Number Publication Date
EP1452302A1 true EP1452302A1 (de) 2004-09-01
EP1452302B1 EP1452302B1 (de) 2009-04-08

Family

ID=32749031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03405126A Expired - Lifetime EP1452302B1 (de) 2003-02-26 2003-02-26 Verfahren zur Korrigierung eines Biegvorgangs und Biegepresse

Country Status (7)

Country Link
US (1) US7503200B2 (de)
EP (1) EP1452302B1 (de)
CN (1) CN1767940A (de)
AT (1) ATE427830T1 (de)
CA (1) CA2516998A1 (de)
DE (1) DE60327042D1 (de)
WO (1) WO2004076161A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006026797A1 (de) * 2004-09-10 2006-03-16 Trumpf Maschinen Austria Gmbh & Co. Kg Verfahren zur herstellung eines werkteils durch biegeumformung
FR2877863A1 (fr) * 2004-11-12 2006-05-19 Kazuhisa Oguchi Presse plieuse a 3 points d'appui
WO2008049796A1 (en) * 2006-10-23 2008-05-02 Task 84 S.P.A. Process and device for measuring and controlling structural deflections of a pressing-bending machine
NL2004383A (en) * 2009-03-13 2010-09-14 Amada Europ A press brake for bending sheets.
NL2004385A (en) * 2009-03-13 2010-09-14 Amada Europ A press brake for bending sheets.
NL2004384A (en) * 2009-03-13 2010-09-14 Amada Europ A press brake for bending sheets.
NL2004386A (en) * 2009-03-13 2010-09-14 Amada Europ A press brake for bending sheets.
WO2013092507A1 (en) * 2011-12-20 2013-06-27 Durmazlar Makina Sanayi Ve Ticaret Anonim Sirketi Dynamic deflection compensating mechanism preventing sheet deflection in press brakes
WO2022146266A1 (en) * 2020-12-31 2022-07-07 Baykal Maki̇na Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Gas propellant top beam structure in press brakes

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201114438D0 (en) * 2011-08-22 2011-10-05 Airbus Operations Ltd A method of manufacturing an elongate component
ITTV20120125A1 (it) * 2012-07-06 2014-01-07 Gasparini Ind S R L Dispositivo per la bombatura in presse piegatrici.
AT513150B1 (de) * 2012-12-06 2014-02-15 Trumpf Maschinen Austria Gmbh Abkantpresse
JP6257970B2 (ja) * 2013-09-09 2018-01-10 蛇の目ミシン工業株式会社 電動プレス、屈曲点検出方法およびプログラム
JP6257971B2 (ja) * 2013-09-09 2018-01-10 蛇の目ミシン工業株式会社 電動プレス、判断方法およびプログラム
JP2015051453A (ja) * 2013-09-09 2015-03-19 蛇の目ミシン工業株式会社 電動プレス、屈曲点検出方法およびプログラム
DE102013110539B3 (de) * 2013-09-24 2014-11-20 Fette Compacting Gmbh Verfahren zur Herstellung eines Presslings aus pulverförmigem Material
AT515153B1 (de) * 2013-12-04 2015-08-15 Trumpf Maschinen Austria Gmbh Biegemaschine
CN106424229A (zh) * 2016-11-23 2017-02-22 南通新通威机床有限公司 超大型折弯机结构优化及刚度补偿方法
US10369613B2 (en) * 2017-02-06 2019-08-06 GM Global Technology Operations LLC Die assembly for a stamping press
CN106890871B (zh) * 2017-04-28 2019-01-11 山东嘉意机械有限公司 机架变形补偿装置及折弯机
CN106955912A (zh) * 2017-04-28 2017-07-18 上海葛世工业自动化有限公司 自动扰度补偿装置及折弯机
JP6638022B2 (ja) * 2018-05-28 2020-01-29 株式会社アマダホールディングス プレスブレーキ制御装置、プレスブレーキ制御方法、及び金型
CN110961496B (zh) * 2019-11-22 2021-07-20 天水锻压机床(集团)有限公司 基于高精度数控悬臂成型机高硬度板料折弯的智能补偿系统及补偿方法
AT523965B1 (de) 2020-07-09 2023-08-15 Trumpf Maschinen Austria Gmbh & Co Kg Biegevorrichtung mit Durchbiegungsausgleich
CN114653790A (zh) * 2022-05-26 2022-06-24 中国二十二冶集团有限公司 直流电弧炉大电流回流母线软连接母排的校正装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408471A (en) * 1980-10-29 1983-10-11 Massachusetts Institute Of Technology Press brake having spring-back compensating adaptive control
EP0540476A1 (de) * 1991-10-31 1993-05-05 Beyeler Raskin S.A. Verfahren zum Steuern des Stösselhubes einer Abkantpresse und Abkantpresse mit einer Steuervorrichtung zum Durchführen des Verfahrens
US20010009106A1 (en) * 2000-01-24 2001-07-26 Gerrit Gerritsen Method of adjusting the stroke of a press brake

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CH653289A5 (en) 1982-11-03 1985-12-31 Beyeler Machines Sa Hydraulic press including a stationary apron and a movable apron
CH680773A5 (de) 1989-09-11 1992-11-13 Beyeler Machines Sa
IT1250562B (it) * 1991-12-30 1995-04-20 Prima Ind Spa Pressa piegatrice di precisione per pezzi di lamiera relativamente corti.
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
IT1295498B1 (it) * 1997-10-17 1999-05-12 Luciano Gasparini Dispositivo per rilevare la flessione delle traverse, inferiore e superiore, finalizzato all'interazione con almeno un sistema di
FI105366B (fi) * 1997-10-29 2000-07-31 Nokia Networks Oy Linearisointimenetelmä ja vahvistinjärjestely
FR2782942B1 (fr) * 1998-09-09 2000-12-01 Amada Europ Sa Presse plieuse a tablier inferieur actif
AT411164B (de) * 2000-08-16 2003-10-27 Trumpf Maschinen Austria Gmbh Verfahren zum betrieb einer biegepresse und biegepresse, insbesondere abkantpresse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408471A (en) * 1980-10-29 1983-10-11 Massachusetts Institute Of Technology Press brake having spring-back compensating adaptive control
EP0540476A1 (de) * 1991-10-31 1993-05-05 Beyeler Raskin S.A. Verfahren zum Steuern des Stösselhubes einer Abkantpresse und Abkantpresse mit einer Steuervorrichtung zum Durchführen des Verfahrens
US20010009106A1 (en) * 2000-01-24 2001-07-26 Gerrit Gerritsen Method of adjusting the stroke of a press brake

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006026797A1 (de) * 2004-09-10 2006-03-16 Trumpf Maschinen Austria Gmbh & Co. Kg Verfahren zur herstellung eines werkteils durch biegeumformung
FR2877863A1 (fr) * 2004-11-12 2006-05-19 Kazuhisa Oguchi Presse plieuse a 3 points d'appui
WO2008049796A1 (en) * 2006-10-23 2008-05-02 Task 84 S.P.A. Process and device for measuring and controlling structural deflections of a pressing-bending machine
FR2942979A1 (fr) * 2009-03-13 2010-09-17 Amada Europ Presse plieuse pour le pliage de feuilles
ES2382283A1 (es) * 2009-03-13 2012-06-06 Amada Europe Prensa plegadora para el plegado de laminas.
NL2004384A (en) * 2009-03-13 2010-09-14 Amada Europ A press brake for bending sheets.
NL2004386A (en) * 2009-03-13 2010-09-14 Amada Europ A press brake for bending sheets.
FR2942981A1 (fr) * 2009-03-13 2010-09-17 Amada Europ Presse plieuse pour le pliage de feuilles
FR2942983A1 (fr) * 2009-03-13 2010-09-17 Amada Europ Presse plieuse pour le pliage de feuilles
FR2942982A1 (fr) * 2009-03-13 2010-09-17 Amada Europ Presse plieuse pour le pliage de feuilles
NL2004383A (en) * 2009-03-13 2010-09-14 Amada Europ A press brake for bending sheets.
FR2942980A1 (fr) * 2009-03-13 2010-09-17 Amada Europ Presse plieuse pour le pliage de feuilles
NL2004385A (en) * 2009-03-13 2010-09-14 Amada Europ A press brake for bending sheets.
ES2382282A1 (es) * 2009-03-13 2012-06-06 Amada Europe Prensa plegadora para el plegado de laminas.
ES2382284A1 (es) * 2009-03-13 2012-06-06 Amada Europe Prensa plegadora para el plegado de laminas.
ES2382287A1 (es) * 2009-03-13 2012-06-07 Amada Europe Prensa plegadora para el plegado de laminas.
US8245557B2 (en) 2009-03-13 2012-08-21 Amada Co., Ltd. Press brake for bending sheets
US8438894B2 (en) 2009-03-13 2013-05-14 Amada Co., Ltd. Press brake for bending sheets
DE102010015922B4 (de) * 2009-03-13 2016-09-01 Amada Co., Ltd. Abkantpresse zum Biegen von Folien
US8607611B2 (en) 2009-03-13 2013-12-17 Amada Co., Ltd. Press brake for bending sheets
WO2013092507A1 (en) * 2011-12-20 2013-06-27 Durmazlar Makina Sanayi Ve Ticaret Anonim Sirketi Dynamic deflection compensating mechanism preventing sheet deflection in press brakes
WO2022146266A1 (en) * 2020-12-31 2022-07-07 Baykal Maki̇na Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Gas propellant top beam structure in press brakes

Also Published As

Publication number Publication date
US20070033981A1 (en) 2007-02-15
ATE427830T1 (de) 2009-04-15
CA2516998A1 (en) 2004-09-10
WO2004076161A1 (fr) 2004-09-10
CN1767940A (zh) 2006-05-03
US7503200B2 (en) 2009-03-17
EP1452302B1 (de) 2009-04-08
DE60327042D1 (de) 2009-05-20

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