EP0173755B1 - Dispositif d'étirage dans une presse - Google Patents

Dispositif d'étirage dans une presse Download PDF

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Publication number
EP0173755B1
EP0173755B1 EP84107551A EP84107551A EP0173755B1 EP 0173755 B1 EP0173755 B1 EP 0173755B1 EP 84107551 A EP84107551 A EP 84107551A EP 84107551 A EP84107551 A EP 84107551A EP 0173755 B1 EP0173755 B1 EP 0173755B1
Authority
EP
European Patent Office
Prior art keywords
pressure
cylinder
blank holder
press
valve
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
Application number
EP84107551A
Other languages
German (de)
English (en)
Other versions
EP0173755A1 (fr
Inventor
Franz Schneider
Peter Pfeifle
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
Priority to DE8484107551T priority Critical patent/DE3476524D1/de
Priority to EP84107551A priority patent/EP0173755B1/fr
Priority to US06/743,080 priority patent/US4601190A/en
Priority to BR8503119A priority patent/BR8503119A/pt
Publication of EP0173755A1 publication Critical patent/EP0173755A1/fr
Application granted granted Critical
Publication of EP0173755B1 publication Critical patent/EP0173755B1/fr
Expired 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 device in a press, with a pressure cheek that is adjustably mounted in the press table and can be moved via at least one printing unit, and with a number of pressure cylinders for holding the drawing workpiece that cooperate with the parts of the sheet metal holder and the parts of the sheet metal holder Drawing tool parts and, if necessary, for ejecting the drawing workpiece to be deformed in the drawing tool parts.
  • Devices of this type are generally known in presses and z. B. used in the drawing stage of a transfer press.
  • DE-A 28 24 723 describes a method for forming the edge flange in angled corners in drawing workpieces, a drawing tool and a sheet metal holder therefor, the sheet metal holder acting on the drawing workpiece with a graduated holding force to avoid material accumulation as a result of contraction during the drawing process.
  • DE-C 32 02134 describes a pulling device for a press which has a pressure cheek which can be displaced in the press table.
  • the pressure cheek is located below a clamping plate for the lower part of the tool and is supported in a pressure cylinder fixed to the frame.
  • a number of pressure cylinders, which act on the ejector pins in the lower part of the tool via a pin plate, are arranged with the pressure cheek.
  • the pressure cheek is lowered due to the pulling process over the pin plate and the ejector pins.
  • the pistons of the pressure cylinders are acted upon by an ejector movement for the drawing workpiece with a small pressure, but the same for all pressure cylinders, while the pressure cheek is held pneumatically in the downwardly moved position.
  • the pressure cheek colors with a time delay to act on the pin plate at the beginning of the next drawing process.
  • DE-A-32 42 705 describes a die cushion for a sheet metal drawing press with a number of pressure cylinders permanently installed in the press table, the working pistons of which act together on a pressure cheek at spaced-apart pressure points.
  • the pressure in each pressure cylinder can be adjusted to differing pressure levels via pilot control units.
  • the object is achieved in a generic drawing device according to the invention in that the pressure cylinders interacting with the pressure cheek and with the sheet metal holder are rigidly fastened to the cylinder housings in the press table for the operating state, the cylinder spaces are possibly formed by the press table in that the pistons the pressure cylinder is guided out of the cylinder housing on both sides via piston rods, one end cooperates with the sheet metal holder and the other side with the pressure cheek, and that the cylinder space of each pressure cylinder on the piston side facing away from the sheet metal holder is separated by a flow-variable valve with passive control with a drain at active control with a pressure unit for the pressure medium is fluidly connected.
  • the special embodiment of the invention according to the characterizing part of claim 2 avoids additional control effort.
  • the enlarging cylinder space below the piston of each pressure cylinder fills z. B. from a reservoir located above the pressure cylinder.
  • circuit structure can be carried out hydraulically, pneumatically as well as mixed hydraulically / pneumatically in order to take advantage of, for. B. damped starting and stopping, one and the other system while avoiding the disadvantages, for. B. rust formation due to moisture precipitation.
  • FIGS. 1 and 6 there is a tool upper part with 1 attached to the ram of a press, a press table with 2, a pressure cheek with 3, a first pressure cylinder with 4 fixedly arranged in the press table 2 and others in the press table 2 for the press operation (drawing processes ) permanently arranged, otherwise interchangeable and / or adjustable in the sense of transverse movements when setting up the drawing tool with 6.
  • the plunger or the tool upper part 1, which can be moved with respect to the press table 2, has an ejector plate 7, which ejects a shaped drawing workpiece 9 via one or more ejector rod (s) 8 from the upper tool part 1 during the pushing-up process.
  • the drawing workpiece 9 lies in FIGS.
  • the sheet metal holder 11 is supported by piston rods 13 of the pressure cylinder 6.
  • the housing of the pressure cylinder 6 can also be formed by cavities in the press table 2, taking standard dimensions into account.
  • the piston rods 13 project on both sides from the housings of the pressure cylinders 6 and on the one hand with the sheet metal holder 11 and on the other hand with the pressure cheek 3 in operative connection.
  • the drawing workpiece 9 inserted into the tool from the upper tool part 1 and a lower tool part 12, here drawn as a male part, is to be deformed in the drawing process, as shown in FIGS. 1 to 5.
  • the counter-holding force between the sheet metal holder 11 and the upper part 1 of the tool during the drawing process is applied by the pressure cylinders 6 with appropriate control (FIG. 6).
  • the separate activation of each individual printing cylinder 6 enables adjustment to deformation-specific conditions, in particular in the corner regions of the drawn parts.
  • the drawing of the drawing workpiece 9 can also take place via separate ejectors 14 according to FIG. 5.
  • Fig. 2 shows the completed molding process, wherein the one ends of the piston rods 13 are guided into the area of the pressure cheek 3 lowered before or during the molding process, but without touching it. Otherwise, the ends of the piston rods 13 can then rest on the pressure cheek 3 if the latter is carried along with the tappet movement.
  • FIG. 1 shows the completed starting process
  • the drawing workpiece 9 is pressed out of the upper tool part 1 by means of the pressure plate 7 and the ejector rod (s) 8.
  • the pressure cylinder 4 is acted upon by the pump unit 16 (FIG. 6), possibly from a pressure accumulator 31, in order to move the drawing workpiece 9 via the pressure cheek 3, the piston rods 13 and the sheet metal holder 11 into the Raise the transport level for the drawing workpiece 9.
  • FIG. 4 shows the completed process. After the sheet metal holder 11 has been raised, the pressure cylinder 4 is reversed in order to lower the pressure cheek 3 via its piston rod 15.
  • a further possibility provides for the pressure cylinder 4 to be controlled via the multi-way valve 18 shown in FIG. 6 in such a way that the pressure cheek 3 follows the movement of the upper tool part 1.
  • the pressure for raising the pressure cheek 3 can then also be derived from the pressure accumulator 31.
  • Fig. 6 shows a basic circuit structure using the components explained in Figs. 1 to 5 with a pressure unit from a pump unit 16, a pre-pressure unit 17, a multi-way valve 18, which via pipes 19 to the upper and lower pressure chambers 21, 22 of the
  • the first pressure cylinder 4 is connected to selectively pressurize the pressure cylinder 4 in one or the other adjustment direction.
  • the upper pressure chamber 21 is flow-connectable via the multi-way valve 18, the lower pressure chamber 22 via an adjustable safety valve 23 with a pressure relief 25.
  • the upward and downward movements of the piston 24, the piston rod 15 and, via this, the pressure cheek 3 take place by switching the multi-way valve 18 into corresponding switching positions.
  • the lower pressure chambers 26 of the pressure cylinder 6, of which four pressure cylinders are shown, but which are available in number of discrete pressure points on the sheet metal holder 11, are each via a controllable proportional valve 27, which is also a pressure limiter valve or z. B. can be a throttle valve connected to the pressure relief 25. Parallel to these proportional valves 27, a common or a non-return valve 28 is connected, which block in the direction of the pressure drain and is fluidly connected to a pressure medium reservoir 29 for filling the lower pressure chambers 26 when the pressure cheek 3 is raised.
  • the upper pressure chambers (not shown in detail) are the pressure cylinders 6 connected to the atmosphere, an inert gas or a pressureless medium during press operation. For the tool change, for example, it is necessary to apply pressure to the upper pressure chambers in order to hold the sheet metal holder 11 or the piston rods 13 lower. The lowering process is possible by means of the existing pressure unit or another pressure unit and corresponding control means.
  • the piston rods 13, the pressure cylinder 6 and the sheet metal holder 11 are to be brought into a position which corresponds to the transport plane for the drawing workpieces in order to accommodate a new drawing workpiece 9.
  • the pressure cheek 3 must be raised with the corresponding switching position of the multi-way valve 18 (right switching position) and loading of the lower pressure chamber 22, while the Hochfachrens of the piston rods 13 pressure medium flows from the pressure medium reservoir 29 via the check valves 28 into the lower pressure chambers located under the piston 30 26 of the impression cylinder 6.
  • the pressure cheek 3 is then brought into the lower position by switching the multi-way valve 18 (left switching position).
  • the pressure cylinder 6 builds up in the lower pressure chambers 26 a pressure that can be set for each pressure cylinder 6 by means of the proportional valves 27. It is understood that the pulling device is not tied to the vertical position as shown and described. In contrast to the passive control described above, however, active control of the lower pressure chambers 26 of the pressure cylinders 6 by means of a pressure unit and separately volume-controlled valves (proportional valves) is also possible.
  • the upper and the lower pressure chamber 21, 22 can optionally be connected to the pressure accumulator 31 or a pressure relief 25.

Claims (2)

1. Dispositif d'emboutissage pour une presse, comprenant une plaque de pression (3) montée mobile dans la table (2) de la presse, et qui peut être mise en mouvement au moyen d'au moins une unité de pression (4, 16 à 19 et 21, 22), et un certain nombre de vérins (6), qui coopèrent avec la plaque de pression (3) et avec un serre-flan (11), ou avec les éléments du serre-flan dans le cas d'un serre-flan (11) en plusieurs parties, pour maintenir la pièce à emboutir (9) contre les éléments de l'outil d'emboutissage et éventuellement pour éjecter la pièce (9) qu'il s'agit de déformer dans les éléments de l'outil d'emboutissage (1, 12), caractérisé en ce que les vérins (6) qui coopèrent avec la plaque de pression (3) et avec le serre-flan (11) sont fixés rigidement par leurs corps de cylindres dans la table (2) de presse pour l'état de fonctionnement, les chambres (26) des cylindres étant éventuellement formées par la table (2) de la presse, en ce que les pistons (30) des vérins (6) émergent des corps de cylindres des deux côtés par leurs tiges de pistons (13), et coopèrent à une extrémité avec le serre-flan (11) et à l'autre extrémité avec la plaque de pression (3) et en ce que la chambre du cylindre (26) à chaque vérin (6) située sur la face du piston qui est à l'opposé du serre-flan (11) est individuellement en communication fluidique, par l'intermédiaire d'une soupape à section de passage réglable (27), avec une décharge (29) dans le cas de la commande passive et avec un groupe de pression du fluide de pression dans le cas de la commande active.
2. Dispositif d'emboutissage selon la revendication 1, caractérisé en ce que chaque soupape (27) est une soupape proportionnelle commandée, en parallèle avec laquelle est branché un clapet anti-retour (28) qui se ferme dans le sens de l'écoulement.
EP84107551A 1984-06-29 1984-06-29 Dispositif d'étirage dans une presse Expired EP0173755B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8484107551T DE3476524D1 (en) 1984-06-29 1984-06-29 Drawing device in a press
EP84107551A EP0173755B1 (fr) 1984-06-29 1984-06-29 Dispositif d'étirage dans une presse
US06/743,080 US4601190A (en) 1984-06-29 1985-06-10 Drawing installation in a press
BR8503119A BR8503119A (pt) 1984-06-29 1985-06-28 Conjunto de estiragem em uma prensa

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84107551A EP0173755B1 (fr) 1984-06-29 1984-06-29 Dispositif d'étirage dans une presse

Publications (2)

Publication Number Publication Date
EP0173755A1 EP0173755A1 (fr) 1986-03-12
EP0173755B1 true EP0173755B1 (fr) 1989-02-01

Family

ID=8192025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107551A Expired EP0173755B1 (fr) 1984-06-29 1984-06-29 Dispositif d'étirage dans une presse

Country Status (4)

Country Link
US (1) US4601190A (fr)
EP (1) EP0173755B1 (fr)
BR (1) BR8503119A (fr)
DE (1) DE3476524D1 (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640507C3 (de) * 1986-11-27 1998-01-29 Mueller Weingarten Maschf Einrichtung zur Steuerung bzw. Regelung der Blechhalterkraft während des Ziehvorganges
DE3717768A1 (de) * 1987-05-26 1988-12-08 Schuler Gmbh L Zieheinrichtung im pressentisch einer presse
DE3735582C1 (de) * 1987-10-21 1988-04-28 Daimler Benz Ag Doppeltwirkende Presse zum Ziehen von Blechteilen
DE3735581C1 (de) * 1987-10-21 1988-05-11 Daimler Benz Ag Presse zum Ziehen von Blechteilen
DE3807683A1 (de) * 1988-03-09 1989-09-21 Schuler Gmbh L Ziehapparat in ziehstufen von pressen
DE3933806A1 (de) * 1989-10-10 1991-11-14 Schuler Gmbh L Ziehapparat in ziehstufen von pressen
ES2052298T3 (es) * 1990-04-23 1994-07-01 Mueller Weingarten Maschf Dispositivo de embutir en una prensa para embutir piezas de forma de chapa.
DD298484A5 (de) * 1990-10-02 1992-02-27 Umformtechnik Erfurt Gmbh,De Hydraulischer blechhalter fuer einfachwirkende pressen
DE4112943A1 (de) * 1991-04-20 1992-10-22 Schuler Gmbh L Zieheinrichtung im pressentisch einer presse
DE4218914A1 (de) * 1992-06-10 1993-12-16 Erfurt Umformtechnik Gmbh Hydraulische Zieheinrichtung in einer Presse
DE69309610T2 (de) * 1992-11-05 1997-09-11 Toyota Motor Co Ltd Verfahren und Vorrichtung zum Messen und Einstellen der Presskräfte an einer Presse
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
JP2776196B2 (ja) * 1993-04-28 1998-07-16 トヨタ自動車株式会社 均圧クッション装置の均圧診断方法および装置
DE4324963A1 (de) * 1993-07-24 1995-01-26 Erfurt Umformtechnik Gmbh Blechhalter für einfachwirkende Pressen, insbesondere für mechanische Pressen und Transferpressen
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
DE4441562A1 (de) * 1994-11-23 1996-05-30 Erfurt Umformtechnik Gmbh Längenkompensationseinrichtung in einer Klemmeinrichtung zwischen Ober- und Unterwerkzeug einer Presse
FI100646B (fi) * 1995-12-14 1998-01-30 Balaxman Oy Menetelmä levytyökeskuksessa ja levytyökeskus
ES2190833B1 (es) * 2000-03-30 2004-07-01 Fagor, S. Coop Prensa con cojin hidraulico con sistema de control de fuerza y posicion.
DE102007005011B4 (de) * 2007-02-01 2012-09-06 Saeta Gmbh & Co. Kg Verfahren und Ziehwerkzeug zum Tiefziehen von Rohlingen aus Blechmaterial zu flanschlosen Formlingen
EP2205373B1 (fr) * 2007-10-01 2019-04-24 Inventio AG Dispositif d'emboutissage

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1625991A (en) * 1922-10-21 1927-04-26 Marquette Tool & Mfg Co Blank-holding means
US1562988A (en) * 1922-11-02 1925-11-24 Marquette Tool & Mfg Co Power press
US1664485A (en) * 1927-04-15 1928-04-03 Marquette Tool & Mfg Co Hydraulic cushion for sheet-metal presses
US2243986A (en) * 1935-11-05 1941-06-03 French Oil Mill Machinery Method of drawing metal blanks
US3530702A (en) * 1967-08-29 1970-09-29 Reynolds Metals Co Extruding method and apparatus and parts therefor
US3914978A (en) * 1974-06-06 1975-10-28 Vyzk Ustav Tvarecich Stroju Lower blankholder for sheet-forming mechanical presses
US4309888A (en) * 1976-07-22 1982-01-12 Kraftco Corporation Apparatus for forming a container pan
DE2824723A1 (de) * 1978-06-06 1979-12-13 Uniplanung Gmbh & Co Kg Verfahren zum anziehen eines randflansches mit wenigstens einer raeumlichen ecke bei ziehteilen aus chrom-nickelstahlblechen und werkzeug dafuer
DE3202134C1 (de) * 1982-01-23 1983-07-07 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Druckluft-Zieheinrichtung mit einer im pressentisch gefuehrten Druckwange
DE3242705C2 (de) * 1982-11-19 1985-10-31 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Im Pressentisch einer einfach wirkenden Ziehpresse angeordnete Drucklufteinrichtung

Also Published As

Publication number Publication date
BR8503119A (pt) 1986-03-18
EP0173755A1 (fr) 1986-03-12
DE3476524D1 (en) 1989-03-09
US4601190A (en) 1986-07-22

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