EP0276672A2 - Dispositif d'étirage dans une presse - Google Patents

Dispositif d'étirage dans une presse Download PDF

Info

Publication number
EP0276672A2
EP0276672A2 EP88100276A EP88100276A EP0276672A2 EP 0276672 A2 EP0276672 A2 EP 0276672A2 EP 88100276 A EP88100276 A EP 88100276A EP 88100276 A EP88100276 A EP 88100276A EP 0276672 A2 EP0276672 A2 EP 0276672A2
Authority
EP
European Patent Office
Prior art keywords
pressure
piston
pressure piston
locking device
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.)
Granted
Application number
EP88100276A
Other languages
German (de)
English (en)
Other versions
EP0276672B1 (fr
EP0276672A3 (en
Inventor
Martin Kaletka
Wolfgang Michael
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.)
L Schuler GmbH
Original Assignee
L Schuler GmbH
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 L Schuler GmbH filed Critical L Schuler GmbH
Publication of EP0276672A2 publication Critical patent/EP0276672A2/fr
Publication of EP0276672A3 publication Critical patent/EP0276672A3/de
Application granted granted Critical
Publication of EP0276672B1 publication Critical patent/EP0276672B1/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
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders

Definitions

  • the invention relates to a drawing apparatus of the generic type.
  • the pressure cheek is initially held in the lowered position via a locking cylinder until the ram has a return stroke of e.g. more than the depth of draw.
  • FIGS. 1a and 1b The same components have been used for the embodiments in FIGS. 1a and 1b.
  • a press for example a transfer press
  • the drawing device acting on a pressure cheek 2 has one or more drawing cushions 4 and locking devices 8, 9 acting on the pressure cheek 2 via the drawing cushions 4.
  • the drawing device is fastened to a press-fixed bracket plate 3.
  • the die cushions 4 are formed by drawing cylinders 5, 6, the pressure chambers of which can be pressurized in a known manner via pressure lines 7 for the drawing and ejector operation of sheet metal parts formed in the forming step. Below the drawing cylinders 5, 6 and concentrically to each of these, a printing cylinder 10, 16 is rigidly attached.
  • each die cushion 4 is extended downward and passed through the pressure cylinder 10, 16 connected below and arranged vertically displaceable therein.
  • a pressure piston 12, 18 is slidably mounted on each piston rod 33, 35.
  • the interior of each pressure cylinder 10, 16 is divided by the pressure piston 12, 18 into an upper pressure chamber 11, 17 which can be acted upon via a pressure line 15, 21 and into a lower pressure chamber having a compression spring 13, 19.
  • the compression spring 13, 19 is supported on the inner bottom of the pressure cylinder 10, 16 and on the pressure piston 12, 18.
  • the pressure piston 12, 18 is constantly pressed upward, in the direction of the arrow 31 indicating the direction of action of the counterhold when pulled.
  • the pressure chamber receiving it can also be acted upon, for example, by an equivalent, elastic, in particular compressible, pressure medium.
  • the Piston rod 33, 35 is provided at its lower end with a height-adjustable stop 14, 20.
  • Each pressure piston 12, 18 forms an active surface 32, 34, which limits the pressure space 11, 17 at the bottom.
  • the pressure piston 12, 18 can be moved downward against the stop 14, 20 against the action of the spring 13, 19.
  • the product of the pressure in the pressure chamber 11, 17 and the size of the active surface 32, 34 is greater than the product of pressure in the die cushion 4 and the size of its active surface, plus the force of the compression spring 13 To use 19.
  • the main advantage here is that no hydraulic fluid has to be continuously moved from the upper pressure chamber 11, 17 into the lower pressure chamber for the shutdown of the locking device 8, 9.
  • the hydraulic fluid can be controlled in a targeted manner via the control circuit according to FIG. 2.
  • the pressure chamber 11, 17 of the locking device is connected via the pressure line 15, 21, a check valve 30 and a 2/2 way valve 28 to a pressure accumulator 26.
  • the pressure in this is applied via a motor-pump unit 25 via the pressure line 27 and a check valve 29. Filters, oilers, water separators, pressure transducers, means for reducing and displaying pressure and the like are not shown in the control circuit, since these means and their use are generally known.
  • the pressure chamber 11, 17 is further connected to a trough 24 for hydraulic fluid via a drain line 23, into which a throttling directional control valve 22 is introduced.
  • the directional valve 22 in FIG. 2 must be brought into the open position and held so that the pressure in the pressure chamber 11 is reduced and the pressure piston 12 is removed from the stop 14 by means of the compression spring 13 takes off.
  • the operating state shown in FIG. 1b can be achieved by building up pressure in the pressure chamber 17 and displacing the pressure piston 18 against the action of the compression spring 19.
  • the phase of the trailing of the pressure cheek 2 on the run-up movement of the press ram, start and speed, is dependent on the respective (current) ram position and requires the throttling directional control valve 22 to be actuated via, for example, ram-synchronous Curve taps.
  • the throttling directional control valve 22 is to be opened after the press ram has carried out a return stroke, for example of the size of the drawing stroke.
  • the speed of the trailing of the pressure cheek 2 can be specified by selecting the appropriate throttle cross section of the throttling directional valve 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Actuator (AREA)
EP88100276A 1987-01-24 1988-01-12 Dispositif d'étirage dans une presse Expired - Lifetime EP0276672B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873702069 DE3702069A1 (de) 1987-01-24 1987-01-24 Ziehapparat in einer presse
DE3702069 1987-01-24

Publications (3)

Publication Number Publication Date
EP0276672A2 true EP0276672A2 (fr) 1988-08-03
EP0276672A3 EP0276672A3 (en) 1990-06-13
EP0276672B1 EP0276672B1 (fr) 1992-05-20

Family

ID=6319468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100276A Expired - Lifetime EP0276672B1 (fr) 1987-01-24 1988-01-12 Dispositif d'étirage dans une presse

Country Status (5)

Country Link
US (1) US4840055A (fr)
EP (1) EP0276672B1 (fr)
CA (1) CA1289417C (fr)
DE (2) DE3702069A1 (fr)
ES (1) ES2032872T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110947859A (zh) * 2019-12-23 2020-04-03 杜海芳 一种用于模具加工的自动弹料装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4117102A1 (de) * 1991-05-25 1992-11-26 Schuler Gmbh L Presse mit zieheinrichtung
KR101545364B1 (ko) * 2007-10-01 2015-08-18 인벤티오 아게 딥 드로잉 장치
DE102014101616B4 (de) * 2014-02-10 2015-09-03 Schuler Pressen Gmbh Hydraulisches Ziehkissen einer Ziehpresse und Verfahren zum Betreiben des hydraulischen Ziehkissens
CN106216473B (zh) * 2016-08-02 2018-06-05 中山胜祥金属制品有限公司 一种具有自动顶出功能的电器配件制造用冲压机
CN106391907A (zh) * 2016-10-26 2017-02-15 福州大学 一种可动式弹顶装置及其制作方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD82108A (fr) *
FR780177A (fr) * 1933-10-26 1935-04-19 Berlin Erfurter Maschinenfabri Porte-tôle hydraulique pour presses, machines à estamper et autres analogues
DE656684C (de) * 1935-06-22 1938-02-12 Weingarten Vorm Hch Schatz A G Sperrvorrichtung fuer den Ruecklauf von Druckluftprellvorrichtungen an Blechziehpressen
US3456478A (en) * 1967-07-07 1969-07-22 Bliss Co Hydraulic locking cylinders
DE2408096B1 (de) * 1974-02-20 1975-08-21 Schuler Gmbh L Ziehapparat an Pressen
DE3521699A1 (de) * 1984-10-08 1986-04-10 VEB Kombinat Umformtechnik "Herbert Warnke" Erfurt, DDR 5010 Erfurt Anordnung zum regeln fuer steuerbare pneumatikkissen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1846439A (en) * 1930-12-26 1932-02-23 Fredrich J Rode Metal working press
US2584339A (en) * 1949-04-06 1952-02-05 Danly Mach Specialties Inc Hydropneumatic locking cushion for power presses
US3005431A (en) * 1955-11-10 1961-10-24 Svenska Aeroplan Ab Hydraulic press
US3237726A (en) * 1962-09-07 1966-03-01 Bendix Corp Shock absorber lock
US3575087A (en) * 1968-11-18 1971-04-13 Lourdes Ind Inc Locking cylinder
US4185539A (en) * 1977-03-07 1980-01-29 Andrew Stratienko Locking device for hydraulic actuator
US4524676A (en) * 1984-01-19 1985-06-25 American Standard Inc. Hydraulic cylinder locking device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD82108A (fr) *
FR780177A (fr) * 1933-10-26 1935-04-19 Berlin Erfurter Maschinenfabri Porte-tôle hydraulique pour presses, machines à estamper et autres analogues
DE656684C (de) * 1935-06-22 1938-02-12 Weingarten Vorm Hch Schatz A G Sperrvorrichtung fuer den Ruecklauf von Druckluftprellvorrichtungen an Blechziehpressen
US3456478A (en) * 1967-07-07 1969-07-22 Bliss Co Hydraulic locking cylinders
DE2408096B1 (de) * 1974-02-20 1975-08-21 Schuler Gmbh L Ziehapparat an Pressen
DE3521699A1 (de) * 1984-10-08 1986-04-10 VEB Kombinat Umformtechnik "Herbert Warnke" Erfurt, DDR 5010 Erfurt Anordnung zum regeln fuer steuerbare pneumatikkissen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110947859A (zh) * 2019-12-23 2020-04-03 杜海芳 一种用于模具加工的自动弹料装置

Also Published As

Publication number Publication date
DE3871161D1 (de) 1992-06-25
EP0276672B1 (fr) 1992-05-20
EP0276672A3 (en) 1990-06-13
US4840055A (en) 1989-06-20
DE3702069A1 (de) 1988-08-04
ES2032872T3 (es) 1993-03-01
CA1289417C (fr) 1991-09-24

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