EP0268894A2 - Dispositif d'étirage pour presse - Google Patents

Dispositif d'étirage pour presse Download PDF

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Publication number
EP0268894A2
EP0268894A2 EP87116280A EP87116280A EP0268894A2 EP 0268894 A2 EP0268894 A2 EP 0268894A2 EP 87116280 A EP87116280 A EP 87116280A EP 87116280 A EP87116280 A EP 87116280A EP 0268894 A2 EP0268894 A2 EP 0268894A2
Authority
EP
European Patent Office
Prior art keywords
pressure
die
sheet metal
und
ram
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
EP87116280A
Other languages
German (de)
English (en)
Other versions
EP0268894A3 (en
EP0268894B1 (fr
Inventor
Siegfried Baur
Rudi Brandstetter
Gerhard Roos
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 EP0268894A2 publication Critical patent/EP0268894A2/fr
Publication of EP0268894A3 publication Critical patent/EP0268894A3/de
Application granted granted Critical
Publication of EP0268894B1 publication Critical patent/EP0268894B1/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

Definitions

  • the invention relates to a pulling device for a press of the generic type.
  • Such a pulling device is described in DE 35 05 984 A1.
  • the various individual functions of the drawing device such as controlling the sheet holder pressure, controlling the upward movement of the sheet holder, controlling the ejector movement and the end position stop can be set and controlled independently of one another.
  • the pulling device has pressure cylinders for sheet metal holding during the pulling and pressure cylinders for ejecting the workpieces, as well as a pressure cheek guided in the press table and movable and supported by the pressure cylinders. After the working stroke of the drawing ram, follow-up control devices come into effect for a time-independent ramp-up of ejector and drawing piston rods.
  • the drawing piston rods can be detached from the underside of the pressure cheek.
  • the sheet inserted into the tool is first pressed against the sheet holder by the drawing ring and then moved together with the sheet holder against the holding force exerted by the drawing device.
  • the ram In addition to the holding force to be exerted by the pulling device, the ram must also overcome the inertial forces which come into effect as a result of the acceleration of the movable masses of the sheet metal holder and pulling device at the beginning of the deformation.
  • the drawing device in FIG. 1 has a number of printing cylinders 3 for sheet metal holding and at least one printing cylinder 5 for ejecting the shaped workpiece.
  • the pressure cylinders 3 and 5 are held by a bracket 8, which can be part of the press table, and act on the pressure cheek 1 from below via their piston rods 4 and 31.
  • the piston rods 4 can be detached from the underside of the pressure cheek 1 for ejector operation.
  • Ball sockets are indicated by 30 and 32 respectively.
  • pressure rods 2 Above the pressure beam 1, pressure rods 2 are shown, which engage in the drawing tool on the press table and are placed against the sheet metal holder or an Auserfer element.
  • the piston rods 4 and 31 are extended downward and extend into an additional additional pressure cylinder 6 and 7, respectively.
  • the diameters are those with the piston rods 31, 4 Pistons 22 and 23 carried along are of different sizes if, for example, the same pressure conditions are to prevail in the pressure cylinders 6, 7.
  • a pressure chamber 36 and 9 is provided above each of the pressure pistons 22, 23, the actual effective surface 33 and 34 of each piston 22, 23 and thus the piston rods 31, 4 being moved in the direction of pull 37 when they are pressurized. Stops 25 limit the movement of the piston rods 31, 4 in the upward movement.
  • the pressure chamber 36 above the piston 22 is on the one hand in fluid communication via a pressure line 10 with a pressure volume chamber 18 in a pre-acceleration cylinder 13 which is fixed to the press.
  • a follow-up line 12 is led into the pressure chamber 36, from which hydraulic fluid can flow in the pressure chamber 36 when suction pressure occurs.
  • the pressure spaces 9 in the pressure cylinders 7 are in flow connection separately from one another via pressure lines 11, each with a pressure volume space 19 in the pre-acceleration cylinder 13.
  • a follow-up line 12 is led into the pressure chambers 9, from which hydraulic fluid can flow in the pressure chambers 9 when suction pressure occurs.
  • the inflow of hydraulic fluid from a pressure accumulator into the pressure chambers 36 and 9 is accomplished via a throttling directional control valve.
  • the directional control valve which can be a so-called prop valve, is controlled as a function of the position or movement of the ram into the open position.
  • the pressure piston 15 is assigned a pressure chamber 14, the hydraulic fluid from ho from a pressure accumulator 21 when a valve 20 is switched hem pressure is supplied.
  • the valve 20 is also a throttling directional control valve and the control is also carried out, for example, from the press control via the control line 35 as a function of the position or movement of the drawing ram.
  • the timing of the directional control valve 20 in the pressure line to the pressure chamber 14 of the pre-acceleration cylinder 13 and the directional control valve in the follow-up line 12 into the pressure chambers 36, 9 can be explained with reference to FIG. 2.
  • the movement characteristic of the drawing plunger, plotted against the angle of rotation, is shown in curve 26.
  • the sheet metal holder with the sheet metal lying thereon to be formed into a workpiece is to be pre-accelerated in the drawing direction 37 (curve 27) by opening the directional control valve 20 in the pressure line the pressure chamber 14 in the pre-acceleration cylinder 13.
  • the movement of the pressure pistons 16, 17 in the pressure quantity spaces 18, 19 moves a targeted amount of hydraulic fluid via the pressure lines 10, 11 into the pressure spaces 36, 9, so that the pressure pistons 22, 23 in the direction of pull 37 be accelerated.
  • the pre-acceleration phase 28 changes into a suction phase 29 for the pressure chambers 36, 9 when the drawing plunger with the drawing ring hits the sheet metal.
  • the directional valves in the follow-up lines 12 to the pressure chambers 36, 9 must be opened.
  • the suction phase in the pressure chambers 36, 9 ends with the reversal of the movement of the drawing ram and the controlled raising of the pressure cheek 1.
  • the diameters of the pistons 17, 16 in the pressure volume spaces 18, 19 must be set in relation to the active surfaces 33, 34 on the pistons 22, 23 in the pressure spaces 36, 9. It is understood that the pressure pistons 18, 19 can be moved by separate pre-acceleration cylinders 13 for the use of other stroke and pressure conditions. That would be e.g. then given when the pre-acceleration of the sheet metal holder is to be achieved for spatial reasons and for reasons of a low pressure specification.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP87116280A 1986-11-28 1987-11-05 Dispositif d'étirage pour presse Expired - Lifetime EP0268894B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3640787 1986-11-28
DE19863640787 DE3640787A1 (de) 1986-11-28 1986-11-28 Zieheinrichtung fuer eine presse

Publications (3)

Publication Number Publication Date
EP0268894A2 true EP0268894A2 (fr) 1988-06-01
EP0268894A3 EP0268894A3 (en) 1989-11-29
EP0268894B1 EP0268894B1 (fr) 1992-08-12

Family

ID=6315064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116280A Expired - Lifetime EP0268894B1 (fr) 1986-11-28 1987-11-05 Dispositif d'étirage pour presse

Country Status (5)

Country Link
US (1) US4821552A (fr)
EP (1) EP0268894B1 (fr)
CA (1) CA1291372C (fr)
DE (2) DE3640787A1 (fr)
ES (1) ES2033769T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0573830A1 (fr) * 1992-06-10 1993-12-15 Umformtechnik ERFURT GmbH Dispositif d'étirage hydraulique dans une presse
EP0596696A1 (fr) * 1992-11-05 1994-05-11 Toyota Jidosha Kabushiki Kaisha Procédé et dispositif pour contrôler, vérifier ou optimaliser la pression des goupilles des cylindres d'amortissement d'une presse par déchargement du fluide ou de la pression initiale
US5457980A (en) * 1992-11-05 1995-10-17 Toyota Jidosha Kabushiki Kaisha Method and device for controlling, checking or optimizing pressure of cushion pin cylinders of press by discharging fluid or initial pressure
US5471861A (en) * 1993-04-28 1995-12-05 Toyota Jidosha Kabushiki Kaisha Method and apparatus for diagnosing press cushioning device, on optimum range of blank-holding force

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3933806A1 (de) * 1989-10-10 1991-11-14 Schuler Gmbh L Ziehapparat in ziehstufen von pressen
US5003807A (en) * 1989-10-30 1991-04-02 Teledyne Industries, Inc. Press assembly and method of operation
US5065606A (en) * 1989-10-30 1991-11-19 Teledyne Industries, Inc. Press assembly with cushion assembly and auxiliary apparatus
JP2727954B2 (ja) * 1994-03-03 1998-03-18 トヨタ自動車株式会社 プレス装置
JP2812201B2 (ja) * 1994-07-15 1998-10-22 トヨタ自動車株式会社 プレス装置
JP3060908B2 (ja) * 1994-12-21 2000-07-10 トヨタ自動車株式会社 プレス機械の均圧装置
JP3181888B2 (ja) * 1999-03-09 2001-07-03 ユミックス株式会社 加工機の静音構造、プレス機械の静音構造、絞り型の静音構造とその静音助走ユニット
JP2002224897A (ja) * 2001-02-02 2002-08-13 Komatsu Ltd ダイクッション装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3085530A (en) * 1958-10-22 1963-04-16 Floyd M Williamson Hydraulic press ram cushion
US3456478A (en) * 1967-07-07 1969-07-22 Bliss Co Hydraulic locking cylinders
US3636749A (en) * 1969-05-20 1972-01-25 Elmer F Heiser Hydraulic pressure control apparatus
EP0074421B1 (fr) * 1981-09-12 1985-05-22 L. SCHULER GmbH Agencement d'emboutissage pour presses à poinçon d'emboutissage actionné mécaniquement
DE3505984A1 (de) * 1985-02-21 1986-08-21 L. Schuler GmbH, 7320 Göppingen Ziehapparat an pressen
DD242355A1 (de) * 1985-10-30 1987-01-28 Warnke Umformtech Veb K Einrichtung zur auftreffstossdaempfung fuer ziehkissen an pressen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0573830A1 (fr) * 1992-06-10 1993-12-15 Umformtechnik ERFURT GmbH Dispositif d'étirage hydraulique dans une presse
EP0596696A1 (fr) * 1992-11-05 1994-05-11 Toyota Jidosha Kabushiki Kaisha Procédé et dispositif pour contrôler, vérifier ou optimaliser la pression des goupilles des cylindres d'amortissement d'une presse par déchargement du fluide ou de la pression initiale
US5457980A (en) * 1992-11-05 1995-10-17 Toyota Jidosha Kabushiki Kaisha Method and device for controlling, checking or optimizing pressure of cushion pin cylinders of press by discharging fluid or initial pressure
EP0773075A3 (fr) * 1992-11-05 1997-10-15 Toyota Motor Co Ltd Procede et dispositif pour controler verifier ou optimaliser la pression des coupilles des cylinders d'amortissement d'une presse pour dechargement ou fluide ou de la pression initiale
US5471861A (en) * 1993-04-28 1995-12-05 Toyota Jidosha Kabushiki Kaisha Method and apparatus for diagnosing press cushioning device, on optimum range of blank-holding force

Also Published As

Publication number Publication date
ES2033769T3 (es) 1993-04-01
EP0268894A3 (en) 1989-11-29
CA1291372C (fr) 1991-10-29
EP0268894B1 (fr) 1992-08-12
DE3640787A1 (de) 1988-06-01
US4821552A (en) 1989-04-18
DE3781099D1 (de) 1992-09-17

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