EP1138406B1 - A press with a hydraulic cushion and a system for controlling the force and pad position thereof - Google Patents

A press with a hydraulic cushion and a system for controlling the force and pad position thereof Download PDF

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Publication number
EP1138406B1
EP1138406B1 EP01500085A EP01500085A EP1138406B1 EP 1138406 B1 EP1138406 B1 EP 1138406B1 EP 01500085 A EP01500085 A EP 01500085A EP 01500085 A EP01500085 A EP 01500085A EP 1138406 B1 EP1138406 B1 EP 1138406B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
control
cushion
force
press
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
EP01500085A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1138406A2 (en
EP1138406A3 (en
Inventor
Victoriano Esteban Grande
Ramon Domaica Lopez De Armentia
Aitor Ormaetxea Abad
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.)
Fagor Electrodomesticos SCL
Original Assignee
Fagor Electrodomesticos SCL
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 Fagor Electrodomesticos SCL filed Critical Fagor Electrodomesticos SCL
Publication of EP1138406A2 publication Critical patent/EP1138406A2/en
Publication of EP1138406A3 publication Critical patent/EP1138406A3/en
Application granted granted Critical
Publication of EP1138406B1 publication Critical patent/EP1138406B1/en
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
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders
    • 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

Definitions

  • the present invention relates to a press with a hydraulic cushions and a control system for controlling the force of the hydraulic cushion when a plate is drawn or stamped, according to the preamble of claim 1 (see for example JP-A-63 273 524).
  • US-5746084 discloses a press on which a cylinder with two pressure chambers is added for pre-acceleration control, said control being carried out by drawing out oil from the lower chamber by means of using a proportional valve and a metering cylinder.
  • the cushion comprises a pneumatic cylinder and a hydraulic cylinder, the pre-acceleration being controlled by way of the hydraulic cylinder.
  • DE-3807683 describes a press that comprises a plurality of cylinder assemblies that include an axially arranged pressing cylinder and a lifting cylinder.
  • the pressures of the pressing cylinders may be regulated individually by means of control elements and there is a control system for simultaneous movement of the lifting cylinders.
  • the pressing cylinders are used for securing the plate during drawing and the lifting cylinders are used for raising the blank holder. This set-up permits control of cushion movement during the whole pressing process, the lifting cylinders being the ones that assist position control (during pre-acceleration, etc.) and the pressing cylinders being the ones that assist force control.
  • the object of the invention is a press with a hydraulic cushion with a system for controlling the force and pad position thereof, as defined in the claims.
  • the control system equipping the press enables the pad position and force to be controlled throughout the pressing process by means of the use of a single control element for each hydraulic cylinder.
  • control element The function of said control element is to regulate the input and output of oil from the lower chamber of each hydraulic cylinder during pressing, both when position control is required and when force control is required.
  • the cushion 2 of the press 1 comprises a box 21 that rests on a plurality of hydraulic cylinders 3. There is one valve 7 per said cylinder 3.
  • the slide 29 of the press 1 which has a reciprocating up and down movement, carries the upper half of the die 18 a , which, together with the lower half of the die 18 b , forms plate 19. Said plate 19 is pressed by the upper half of the die 18 a and the blank holder 20 during the shaping process, the effort of the cushion 2 being transmitted to the blank holder 20 by way of a plurality of pressure pins 30.
  • each cylinder 3 has a rod 14 on which the box 21 rests and a piston 15 that defines an upper chamber 4 and a lower chamber 5.
  • the position and force of each cylinder 3 in the course of the pressing process is controlled by means of a single control element 7 which regulates the pressure of the lower chamber 5 of each cylinder 3.
  • the control element 7 is governed by a control unit 6 by way of a line 26.
  • the control unit 6 receives information on the pressure in chambers 4 and 5 of each cylinder 3, on the position of the piston 15 of each cylinder 3, and on the position of slide 29 of the press 1.
  • the information on the pressure in the chambers 4 and 5 is provided by the pressure transducers 8 and 9 by way of signals 22 and 23, respectively.
  • the position transducers 10 and 11 supply, respectively, information on the position of the cylinder 3 (signal 24) and of the press 1 (signal 23).
  • the control element 7 is a valve that regulates the input and output of oil in chamber 5 by offering resistance to its flow.
  • the outlet of the control element 7 is connected to the lower chamber 5 and its inlets are connected to a pressure generator set 12 and to a tank 13. Furthermore, the upper chamber 4 is also connected to the pressure generator set 12.
  • control unit 6 exchanges status information with the press 1 controller 17 (line 28) and it is communicated with a user interface unit 16 (by way of a line 27). This enables the user to set up the operating and control parameters conveniently, besides performing graphic presentations and storing different working parameters.
  • FIG. 2 Although a single cylinder 3 is shown in FIG. 2, a plurality of cylinders 3 is normally used, so that there will be a valve 7, a pair of pressure transducers 8 and 9 and a position transformer 10 per cylinder 3.
  • FIG. 3 shows some of the paths R that may be traversed by the cushion 2 in relation to the path P of the press 1 slide 29 during plate 19 pressing.
  • These paths R are possible due to the different functions that may be performed by the control system that is the object of the invention. Said functions are, for instance, as follows:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Control Of Presses (AREA)
EP01500085A 2000-03-30 2001-03-29 A press with a hydraulic cushion and a system for controlling the force and pad position thereof Expired - Lifetime EP1138406B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200000793 2000-03-30
ES200000793A ES2190833B1 (es) 2000-03-30 2000-03-30 Prensa con cojin hidraulico con sistema de control de fuerza y posicion.

Publications (3)

Publication Number Publication Date
EP1138406A2 EP1138406A2 (en) 2001-10-04
EP1138406A3 EP1138406A3 (en) 2003-05-21
EP1138406B1 true EP1138406B1 (en) 2005-07-27

Family

ID=8492951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01500085A Expired - Lifetime EP1138406B1 (en) 2000-03-30 2001-03-29 A press with a hydraulic cushion and a system for controlling the force and pad position thereof

Country Status (4)

Country Link
EP (1) EP1138406B1 (es)
AT (1) ATE300370T1 (es)
DE (1) DE60112154T2 (es)
ES (2) ES2190833B1 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10336279A1 (de) * 2003-08-07 2005-03-03 Bosch Rexroth Ag Einrichtung zur Steuerung des Ziehvorgangs bei einer Transferpresse
EP2712688B1 (de) 2012-09-28 2020-12-02 Siemens Aktiengesellschaft Ziehkissenantrieb und Betriebsverfahren eines Ziehkissenantriebes
JP6702004B2 (ja) * 2016-03-04 2020-05-27 日本製鉄株式会社 ホットスタンプ成形品の製造方法および製造装置
US11628483B2 (en) 2017-09-08 2023-04-18 Nippon Steel Corporation Hot stamping formed article and method and device for manufacturing hot stamping formed article

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD208094A1 (de) * 1981-10-21 1984-03-28 Gregor Geist Ziehkissen fuer pressen
EP0173755B1 (de) * 1984-06-29 1989-02-01 L. SCHULER GmbH Zieheinrichtung in einer Presse
JPS63273524A (ja) * 1987-05-01 1988-11-10 Ishikawajima Harima Heavy Ind Co Ltd ダイクッション制御方法
DE59002628D1 (de) * 1989-09-12 1993-10-14 Mueller Weingarten Maschf Mechanische oder hydraulische Presse mit Zieheinrichtung oder Ziehstufe einer Stufenpresse.

Also Published As

Publication number Publication date
EP1138406A2 (en) 2001-10-04
ATE300370T1 (de) 2005-08-15
DE60112154D1 (de) 2005-09-01
ES2244574T3 (es) 2005-12-16
DE60112154T2 (de) 2006-05-24
ES2190833A1 (es) 2003-08-16
ES2190833B1 (es) 2004-07-01
EP1138406A3 (en) 2003-05-21

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