EP0852523B1 - Amelioration au systeme de regulation de la force de serre-flan dans une presse - Google Patents

Amelioration au systeme de regulation de la force de serre-flan dans une presse Download PDF

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Publication number
EP0852523B1
EP0852523B1 EP97923678A EP97923678A EP0852523B1 EP 0852523 B1 EP0852523 B1 EP 0852523B1 EP 97923678 A EP97923678 A EP 97923678A EP 97923678 A EP97923678 A EP 97923678A EP 0852523 B1 EP0852523 B1 EP 0852523B1
Authority
EP
European Patent Office
Prior art keywords
cylinders
pressure
force
stamping
blank
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
EP97923678A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0852523A1 (fr
Inventor
Richard Kergen
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.)
ArcelorMittal Liege Upstream SA
Original Assignee
Cockerill Sambre 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 Cockerill Sambre SA filed Critical Cockerill Sambre SA
Publication of EP0852523A1 publication Critical patent/EP0852523A1/fr
Application granted granted Critical
Publication of EP0852523B1 publication Critical patent/EP0852523B1/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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/02—Die-cushions

Definitions

  • the present invention is in the field of stamping tools working on hydraulic press or mechanical. It concerns in particular a system to regulate the force of hold-down in a stamping press.
  • a stamping press essentially comprises a table on which is fixed a matrix with an imprint whose design is that of the outer surface of the piece to be stamped, a blank holder used to fix the sheet metal blank to be stamped and a punch fixed to the press slide, this punch having a design complementary to that of the matrix imprint.
  • the blank holder exerts a clamping pressure on the blank sides to prevent wrinkling sheet metal due to the shrinking effect.
  • the pressure of clamping exerted by the blank holder can also be used to create a strong tension in the stamped skirt in in the case of conical stamps or for calibration by stretching on punch for example.
  • Document EP-A-0475923 discloses a system allowing to quickly vary the strength of hold down and basically regulate it automatically based on significant process parameters stamping.
  • the cushion strength is chosen greater than the maximum hold-down force exerted as part of regulation and this force is exerted against stops which bear on the part of the tool connected to the movable slide of the hurry.
  • the force exerted by the cushion therefore serves in this case only to close the tooling, the pressure effective of hold-down being exerted by small cylinders placed in the tooling.
  • a constant hold down pressure can be applied in an important area of the hold-down, as in the conventional tools (this area being referred to below conventional blank area), and pressure of variable hold-down can be applied in only one or a few specific areas, called below areas for regulating the blank holder pressure.
  • the present invention responds to these industrial cases.
  • the invention proposes a blanket force regulation system according to which the variation of the effort in the regulation zones of the blank holder pressure is compensated for by so as to keep in the conventional blank holder area a constant predetermined pressure. According to certain variants, thanks to the present invention, this pressure in the conventional blank holder area could also be made variable.
  • FIG. 1 represents a front view of a typical stamping press in which the invention is incorporated, the press being open, before stamping.
  • Figure 2 shows the same press closed at the end of stamping.
  • Figure 3 is a diagram showing the forces involved in the process according to the invention.
  • Figures 4, 5 and 6 illustrate examples of alternative embodiments of the invention.
  • the reference numeral 1 denotes the mobile slide of a stamping press
  • the number 2 designates the matrix fixed to the slide and which presents in hollow the shape of the piece to be stamped
  • the number 3 indicates the blank holder
  • number 4 indicates a blank holder piece directly supporting or indirectly, for example using columns 8 to across table 10, on the press cushion.
  • this part 4 will be designated in the following by the term "cushion”.
  • the punch 9 is fixed and rests on the press table 10, passes through the opening of the blank holder 3.
  • the sheet metal to be stamped is designated by the number 11.
  • the sheet metal 11 turned into a stamped part 11 'more to movement in the direction of arrow F of the slide 1 and the die 2 which covers the punch 9.
  • compensation cylinders 5 are provided, which rest directly or indirectly on the press cushion 4 and exert their force on slide 1.
  • the aforementioned compensation cylinders are compact cylinders whose useful stroke, in function of the very principle of the invention, is limited a few millimeters or even a few tenths of millimeters.
  • These compensation cylinders are distributed around the edge of the blank holder, the distribution being defined by considerations of space or distribution of efforts.
  • the function of these cylinders compensation is to counterbalance and if necessary to compensate for variations in effort from the zones pressure regulator for blanks.
  • These cylinders compensation can be connected hydraulically all together or this connection can be made by zones: we then have different groups of cylinders compensation distributed around the periphery of the hold-down based on pressure distribution considerations hold-down in conventional hold-down areas.
  • the pressure setpoint is evaluated from at least one measurement signal generated by at least one measurement sensor and representing at least one parameter of the stamping process influenced by the hold-down force, setpoint evaluated according to a closed loop regulation principle of so as to control the variation of this parameter by one defined way before the stamping process.
  • the pressure developed in the compensation cylinders 5 is generated by one or more servo-valves according to that they are grouped in one or more zones, this in function of pressure distribution requirements in the conventional hold-down area; the instruction of pressure given to this or these servo valves is calculated so as to compensate for the variations in force generated in the pressure regulation areas of hold-down clamp to maintain hold-down pressure constant in the conventional hold-down area.
  • Figure 3 gives the diagram of the resulting forces in clearance at the hold-down level.
  • Force A developed by the press cushion 4, which is constant or almost constant during stamping, is counterbalanced partially by two opposing forces: force C resulting from pressures in the regulation zone (s) of the blank holder pressure and the resulting force B different compensation cylinders.
  • the residual value, difference between force A and sum of forces B and C therefore applies to the area of conventional blank holder.
  • the force applied to the hold-down area conventional is the difference between force A exerted by the press cushion and this sum B + C.
  • the pressure developed in the compensation cylinders is generated by one or more servo valves depending on that there are one or more zones of compensation cylinders; the pressure setpoint given to this or these servo-valves is therefore calculated by the computer, in function of the total value of the forces C, so that the total value of the compensating forces B is such that the sum B + C is constant.
  • pressure may be different in each area, depending on considerations pressure balance of blank holder in the conventional holddown area but the value total compensation efforts B must meet the criterion set out above.
  • the compensation force B can be defined such that the sum B + C is not constant but varies: we thus obtain also a variable blanket pressure in the conventional hold-down area.
  • the advantage is here economical: when the hold-down pressure can be uniformly varied over a large area of the tool, it is more economical to use cylinders compensation rather than cylinders distributed in the tools.
  • the pressure compensation can be generated by a device hydraulic automatically generating pressure compensation by means of counter cylinders.
  • the principle of such a system is presented in the figure 4. Different cylinders are mounted in a frame 12, independent of the press. A cylinder 13 presses on a plate 15, guided by columns 16 fixed to the frame and limited in race by stops not shown. The plateau 15 relies on at least two groups of cylinders.
  • a first set of cylinders referenced 71 is composed of groups of cylinders hydraulically connected to different servo valves generating variations in pressure in the pressure regulation zones blank holder 6: there is at least one actuator per servo-valve, each cylinder is connected to only one servo valve.
  • the or the cylinders connected to a servo valve constitute a group of cylinders.
  • a second group of cylinders referenced 51 consists of cylinders connected to the compensation cylinders 5.
  • the force exerted by the jack 13 on the plate 15 is chosen to always be greater than the total effort which will be exerted by the jacks 71 receiving their pressure servo valves. Under this condition, it is chosen according to the force A of cushion 4 and the pressure of blank holder that we want to obtain in the conventional hold-down area.
  • the system generates thus automatically the compensation pressure.
  • the stroke of the different cylinders in the hydraulic device must be sufficient to generate a stroke of compensation cylinders guaranteeing an application effective efforts.
  • the strength of hold-down in the conventional hold-down area can also be made variable by varying the FT force during stamping, using a servo valve for example.
  • the compensation cylinders 5 are used alone (there are no pressure zones variable 6 in the blank holder, or cylinders 7) and allow then simply to vary the effort of hold-down in the conventional hold-down area. Seen the compactness of the compensating cylinders, good performance dynamics in terms of force variation can be obtained.
  • the compensation cylinders are distributed around the periphery of the tool so as to obtain an adequate blank holder pressure distribution.
  • This variant can be optimized by using several zones of compensation cylinders divided into depending on the geometry of the part to be stamped.
  • the Figure 5 illustrates the case of a stamped rectangular type and presents a top view of the blank holder and the cushion with an example of distribution of the cylinders compensation.
  • These three groups of cylinders 5 are connected to an element allowing to control the fluid pressure within cylinders, a servo valve for example.
  • the pressure setpoint is determined from at least one measurement signal generated by at at least one measurement sensor and representing at least one parameter of the stamping process influenced by the hold-down force, which setpoint is determined according to a closed loop regulation principle of so as to control the variation of this parameter by one defined way before stamping.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • External Artificial Organs (AREA)
  • Safety Valves (AREA)
  • Press Drives And Press Lines (AREA)
  • Fuel Cell (AREA)
  • Control Of Presses (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Presses And Accessory Devices Thereof (AREA)
EP97923678A 1996-05-30 1997-05-28 Amelioration au systeme de regulation de la force de serre-flan dans une presse Expired - Lifetime EP0852523B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9600485A BE1010313A3 (fr) 1996-05-30 1996-05-30 Amelioration au systeme de regulation de la force de serre-flan dans une presse.
BE9600485 1996-05-30
PCT/BE1997/000063 WO1997046337A1 (fr) 1996-05-30 1997-05-28 Amelioration au systeme de regulation de la force de serre-flan dans une presse

Publications (2)

Publication Number Publication Date
EP0852523A1 EP0852523A1 (fr) 1998-07-15
EP0852523B1 true EP0852523B1 (fr) 2001-01-24

Family

ID=3889773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97923678A Expired - Lifetime EP0852523B1 (fr) 1996-05-30 1997-05-28 Amelioration au systeme de regulation de la force de serre-flan dans une presse

Country Status (15)

Country Link
US (1) US6032506A (ja)
EP (1) EP0852523B1 (ja)
JP (2) JP4190583B2 (ja)
KR (1) KR19990035990A (ja)
AT (1) ATE198846T1 (ja)
AU (1) AU2945597A (ja)
BE (1) BE1010313A3 (ja)
BR (1) BR9706599A (ja)
CA (1) CA2224476C (ja)
DE (1) DE69703964T2 (ja)
DK (1) DK0852523T3 (ja)
ES (1) ES2156379T3 (ja)
GR (1) GR3035772T3 (ja)
PT (1) PT852523E (ja)
WO (1) WO1997046337A1 (ja)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK173519B1 (da) * 1999-06-21 2001-01-29 Hydraulico As Værktøj til presseformgivning af metalplade og fremgangsmåde til regulering af et fladetryk ved brug af sådant værktøj
US7019819B2 (en) * 2002-11-13 2006-03-28 Molecular Imprints, Inc. Chucking system for modulating shapes of substrates
US6939120B1 (en) * 2002-09-12 2005-09-06 Komag, Inc. Disk alignment apparatus and method for patterned media production
US7641840B2 (en) * 2002-11-13 2010-01-05 Molecular Imprints, Inc. Method for expelling gas positioned between a substrate and a mold
KR100512272B1 (ko) * 2004-01-30 2005-09-02 주식회사 일우산업기계 절곡기의 작동 스트로크 조정장치
DE102005021028B4 (de) * 2004-06-02 2009-06-25 Schuler Pressen Gmbh & Co. Kg Presse zum Schneiden von hochfesten Blechen
US8215946B2 (en) 2006-05-18 2012-07-10 Molecular Imprints, Inc. Imprint lithography system and method
US20080060407A1 (en) * 2006-09-08 2008-03-13 Samuel Stamping Technologies High definition door skin and method of manufacturing the same
CN104858283B (zh) * 2015-05-26 2016-08-31 中南大学 一种车用铝板的冲压用装置及冲压方法
CN107297411B (zh) * 2016-04-15 2024-05-03 上海今邦实业有限公司 一种双动力电液伺服冲压机
RU2685624C2 (ru) * 2017-07-25 2019-04-22 Общество с ограниченной ответственностью "Самер" Способ листовой штамповки и дифференцированное прижимное устройство штампа листовой штамповки
US10933458B2 (en) * 2018-12-19 2021-03-02 Fca Us Llc Stretch forming die

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE173184C (ja) *
US1970134A (en) * 1932-07-29 1934-08-14 Oilgear Co Hydraulic press
US4036056A (en) * 1976-02-23 1977-07-19 National Steel Corporation Single-slide press for carrying out multiple functions with a single work-input stroke
JPS60176821U (ja) * 1984-04-27 1985-11-22 株式会社小松製作所 ダイクツシヨン装置
US4745792A (en) * 1986-10-14 1988-05-24 Aluminum Company Of America Blankholder for a draw press
JPH0371932A (ja) * 1989-08-11 1991-03-27 Toyota Motor Corp プレス型用しわ押え圧力調整装置
DE4016838A1 (de) * 1990-05-25 1991-11-28 Smg Sueddeutsche Maschinenbau Ziehapparat in einer presse
BE1004564A3 (fr) * 1990-08-30 1992-12-15 Cockerill Rech & Dev Dispositif de regulation de la force de serre-flan dans une presse.
DE4122128A1 (de) * 1991-07-04 1993-01-07 Dieffenbacher Gmbh Maschf Hydroelastische tiefzieheinrichtung
DE4405909A1 (de) * 1994-02-24 1995-08-31 Erfurt Umformtechnik Gmbh Verfahren und Schaltungsanordnung zum Unterbrechen und Fortführen des Ziehprozesses an zweifachwirkenden Pressen, insbesondere hydraulischen Pressen
JP2812201B2 (ja) * 1994-07-15 1998-10-22 トヨタ自動車株式会社 プレス装置
JP2856107B2 (ja) * 1995-05-22 1999-02-10 トヨタ自動車株式会社 プレス加工方法およびプレス加工装置

Also Published As

Publication number Publication date
PT852523E (pt) 2001-06-29
JP4757892B2 (ja) 2011-08-24
JPH11510435A (ja) 1999-09-14
JP4190583B2 (ja) 2008-12-03
WO1997046337A1 (fr) 1997-12-11
ATE198846T1 (de) 2001-02-15
CA2224476A1 (fr) 1997-12-11
CA2224476C (fr) 2006-10-10
DE69703964T2 (de) 2001-08-16
JP2008207251A (ja) 2008-09-11
DK0852523T3 (da) 2001-06-18
EP0852523A1 (fr) 1998-07-15
BR9706599A (pt) 1999-07-20
ES2156379T3 (es) 2001-06-16
US6032506A (en) 2000-03-07
AU2945597A (en) 1998-01-05
DE69703964D1 (de) 2001-03-01
GR3035772T3 (en) 2001-07-31
KR19990035990A (ko) 1999-05-25
BE1010313A3 (fr) 1998-06-02

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