EP0069201A2 - Coussin d'étirage pour presses - Google Patents

Coussin d'étirage pour presses Download PDF

Info

Publication number
EP0069201A2
EP0069201A2 EP82103208A EP82103208A EP0069201A2 EP 0069201 A2 EP0069201 A2 EP 0069201A2 EP 82103208 A EP82103208 A EP 82103208A EP 82103208 A EP82103208 A EP 82103208A EP 0069201 A2 EP0069201 A2 EP 0069201A2
Authority
EP
European Patent Office
Prior art keywords
piston
cushion
compressed air
cylinder
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.)
Withdrawn
Application number
EP82103208A
Other languages
German (de)
English (en)
Other versions
EP0069201A3 (fr
Inventor
Gregor Geist
Klaus Dünisch
Rolf Zeidler
Wieland Petter
Gerd Zemann
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.)
Umformtechnik Herbert Warnke VEB
Original Assignee
Umformtechnik Herbert Warnke VEB
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 Umformtechnik Herbert Warnke VEB filed Critical Umformtechnik Herbert Warnke VEB
Publication of EP0069201A2 publication Critical patent/EP0069201A2/fr
Publication of EP0069201A3 publication Critical patent/EP0069201A3/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • B21D24/02—Die-cushions

Definitions

  • the invention relates to a pneumatically acting die cushion for presses, in particular for mechanical presses for sheet metal forming, for holding back during the forming process and for ejecting the workpieces after the forming process has ended.
  • Pneumatically acting die cushions are already known (DD-PS 82 108, DD - PS 108 025), in which a single or multi-stage cushion piston acts on a constant air volume.
  • the effective piston surfaces are acted upon on one side with the same air pressure during the holding and ejecting, so that the cushion force when holding and ejecting is approximately the same.
  • the application of the invention is intended to achieve greater economic viability due to better utilization of the energy supplied, as well as the saving of material and technological outlay due to smaller cushion dimensions and the elimination of the cooling devices for the oil circuit.
  • the task arises to use the portion of the energy not required for the ejection process in the cushion during the plunger depression to build up a high operating pressure in the cushion and to generate compressed air for other consumers, such as e.g. Coupling and brake or feed into the company's compressed air network.
  • the cushion piston is designed as a differential piston to which compressed air can be applied on both sides and that the upper part of the lower cylinder chamber is provided with a check valve which blocks the outflow of compressed air during the piston return stroke and via a pipeline is connected to the lower part of the cylinder chamber, which is provided with a non-return valve blocking the overflow of compressed air from the lower part into the upper part of the cylinder chamber and / or a controllable directional valve, by means of which, when the piston reaches the lower end position, the one facing the cushion plate, upper differential piston surface can be acted upon by overflow of compressed air from the lower part into the upper part of the cylinder chamber, and that the lower part of the cylinder chamber is operatively connected via a further pipe to a pressure relief valve, the outlet of which for discharging the compressed air generated with a compressed air tank or is connected to the company's compressed air network.
  • the lower piston surface facing away from the cushion plate is pressurized with compressed air and the cushion piston is in its upper end position.
  • the upper part of the lower cylinder chamber is pressure-relieved, so that the plunger counteracts the full cushion force when holding the plunger forward.
  • air is drawn from the atmosphere into the upper part of the cylinder chamber via a check valve.
  • the upper part of the cylinder chamber is connected to its lower part by actuating a directional control valve, and compressed air is applied to the upper differential piston surface facing the cushion plate by overflow of compressed air from the lower part into the upper part.
  • the cushion piston is bilaterally during the piston return stroke, ie on the lower, larger, facing away from the cushion plate and the upper,
  • the piston surface facing the cushion plate is pressurized with compressed air, so that only the amount of the pressure and area difference of the two piston surfaces is effective for realizing the ejector force.
  • a variant of the die cushion (FIG. 1) consists of two cylinder chambers, an upper, oil-filled control cylinder 1 and a lower, cylinder chamber 2 filled with compressed air, in which a cushion piston 3 designed as a differential piston is arranged, which in turn has a piston rod 4 is connected to the cushion plate 5.
  • the cushion piston 3 acting on a compressed air volume is spatially separated from the cushion plate 5 Place inside or outside of the die cushion and the cushion force is transmitted to the cushion plate 5 by an intermediate oil cushion.
  • the cushion plate 5 is connected via the piston rod 4 to a double-acting piston 22, which is guided in a cylinder space filled with oil. While the upper part of the cylinder space acts as a control cylinder 1 to block the die cushion in the lower end position and to control the upward movement, the lower part 23 of the cylinder space is connected to the upper part 24 of the graduated cylinder space by a pipeline 25 which overflows Pressure oil during the cushion movement and thus a transfer of the cushion force generated by the cushion piston 3 pressurized with compressed air to the cushion plate 5.
  • the cushion piston 3 is geometrically graded so that the upper piston surface 6, which acts on the oil volume, is approximately 1/6 of the opposite piston surface 7 which can be acted upon by compressed air.
  • the control cylinder 1 is connected in a known manner via an electrically controllable directional valve 8 and a controllable throttle valve 9 to an oil container 10 pressurized with compressed air.
  • a check valve 11 is arranged parallel to the directional control valve 8 and throttle valve 9 and blocks the oil leakage from the control cylinder 1.
  • the lower part 12 of the lower cylinder chamber 2 is connected via a pipe to a compressed air reservoir 13 which serves to equalize the pressure (FIG. 1).
  • a compressed air reservoir 13 which serves to equalize the pressure (FIG. 1).
  • the lower part 12 of the cylinder space 2 could also be designed so large that it itself acts as a compressed air reservoir (FIG. 2).
  • a check valve 15 is connected that an inflow of air allows the atmosphere during the downward stroke of the cushion piston 3 and at the same time blocks the outflow of compressed air during the piston return stroke.
  • the upper part 14 of the cylinder space 2 is connected to the lower part 12 of the same by a pipe 16.
  • this pipeline 16 is either with a check valve 17 or a controllable directional valve 18 or with both. Mistake.
  • the air drawn in in the upper part 14 of the cylinder space 2 is compressed during the piston return stroke and flows over the check valve 17 into the lower part 12 of the cylinder space 2 when a corresponding pressure increase is reached.
  • the upper piston surface 19 facing the cushion plate 5 is subjected to a continuously increasing air pressure, the magnitude of the ejector force continuously decreasing.
  • the controllable directional valve 18 is actuated, through which the connection between the lower part 12 and the upper part 14 of the cylinder space 2 is released and compressed air from the lower part 12 into the upper part 14 of the same overflows, which then flows back into the lower part 12 together with the air sucked in from the atmosphere during the return stroke of the cushion piston 3.
  • the upper piston surface 19 facing the cushion plate 5 is pressurized with compressed air, so that only the amount of the area difference between the two piston surfaces 7 and 19 is effective for generating the ejector force during the entire Haiokhubes.
  • a check valve 17 with a controllable directional valve 18 enables the optional adjustment of the ejection characteristic in accordance with the respective technological requirements.
  • the specified at each stroke sucked and compressed air leads to an increase in pressure in the lower part 12 of the cylinder space 2.
  • By independently building up an arbitrarily high operating pressure it is possible to make the die cushion spatially much smaller than the known technical solutions when the same effective cushion forces are achieved is.
  • the intended operating pressure in the lower part 12 of the cylinder chamber 2 is reached, the further, sucked and compressed air is fed via an adjustable pressure relief valve 20 into a compressed air tank 21 or the company compressed air network, where it is available as compressed air for other consumers.
  • the portion of the energy stored in the cushion in the lower end position of the piston, which is not required for the ejection process, is thus used to generate compressed air and does not need to be converted into heat via the oil circuit by throttling action.
  • the oil circuit is only used for the lock control in the lower end position and the end position damping, so that no special cooling device is required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP82103208A 1981-07-08 1982-04-16 Coussin d'étirage pour presses Withdrawn EP0069201A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD23156181A DD206469A3 (de) 1981-07-08 1981-07-08 Pneumatisch wirkendes ziehkissen fuer pressen
DD231561 1981-07-08

Publications (2)

Publication Number Publication Date
EP0069201A2 true EP0069201A2 (fr) 1983-01-12
EP0069201A3 EP0069201A3 (fr) 1983-10-26

Family

ID=5532191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103208A Withdrawn EP0069201A3 (fr) 1981-07-08 1982-04-16 Coussin d'étirage pour presses

Country Status (3)

Country Link
EP (1) EP0069201A3 (fr)
JP (1) JPS589727A (fr)
DD (1) DD206469A3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19521525A1 (de) * 1995-05-09 1996-12-19 Eoc Normalien Gmbh & Co Kg Stickstoffzylindersystem
DE102010019324A1 (de) 2010-05-03 2011-11-03 Schuler Pressen Gmbh & Co. Kg Hydraulischer Zylinder für ein hydraulisches Ziehkissen
CN110576099A (zh) * 2019-09-29 2019-12-17 林昊澄 一种利用水压驱动的零件冲压机构

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD82108A (fr) *
DE1957401A1 (de) * 1969-11-14 1971-06-09 Schuler Gmbh L Vorrichtung zum Vermindern der Druckschwankungen des Blechhalters von Ziehpressen
IT1166653B (it) * 1979-02-22 1987-05-06 Galdabini Renzo Pressa idraulica per imbutitura con recupero di energia

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19521525A1 (de) * 1995-05-09 1996-12-19 Eoc Normalien Gmbh & Co Kg Stickstoffzylindersystem
DE19521525C2 (de) * 1995-05-09 1999-10-14 Eoc Normalien Gmbh & Co Kg Gasdruckzylindersystem
DE102010019324A1 (de) 2010-05-03 2011-11-03 Schuler Pressen Gmbh & Co. Kg Hydraulischer Zylinder für ein hydraulisches Ziehkissen
EP2384834A2 (fr) 2010-05-03 2011-11-09 Schuler Pressen GmbH & Co. KG Vérin hydraulique pour un coussin de serre-flan hydraulique
DE102010019324B4 (de) * 2010-05-03 2015-05-07 Schuler Pressen Gmbh Hydraulisches Ziehkissen
US9038431B2 (en) 2010-05-03 2015-05-26 Schuler Pressen Gmbh & Co. Kg Hydraulic cylinder for a hydraulic drawing cushion
CN110576099A (zh) * 2019-09-29 2019-12-17 林昊澄 一种利用水压驱动的零件冲压机构
CN110576099B (zh) * 2019-09-29 2020-08-11 林昊澄 一种利用水压驱动的零件冲压机构

Also Published As

Publication number Publication date
DD206469A3 (de) 1984-01-25
EP0069201A3 (fr) 1983-10-26
JPS589727A (ja) 1983-01-20

Similar Documents

Publication Publication Date Title
EP1189745B1 (fr) Dispositif de decoupage fin de pieces dans un materiau
EP3115190A1 (fr) Dispositif et procede de commande de l'entrainement principal d'une presse pour decoupage de precision
DE7928194U1 (de) Hydraulische stossdaempfvorrichtung, insbesondere fuer abscherpressen
EP0069201A2 (fr) Coussin d'étirage pour presses
DD208094A1 (de) Ziehkissen fuer pressen
DE19822436A1 (de) Verfahren zum Betrieb einer hydraulischen Presse
EP0276672B1 (fr) Dispositif d'étirage dans une presse
EP0865843A1 (fr) Dispositif d'étirage pour les presses d'étirage
DE3017406A1 (de) Ziehpresse, insbesondere tiefziehpresse
DE19521525C2 (de) Gasdruckzylindersystem
DE3619109A1 (de) Einrichtung zur auftreffstossdaempfung fuer ziehkissen an pressen
DE951849C (de) Schmiedepresse mit Treibapparat, Pumpe und Ablasseinrichtung
DD208095A1 (de) Ziehkissen fuer pressen
DE675854C (de) Sicherung fuer Pressen gegen UEberlastung mittels eines Fluessigkeitskissens
EP0716916B1 (fr) Procédé d'ajustement de l'impact des outils supérieurs et inférieurs d'une presse, diminuant le bruit, et entraínement du coulisseau avec un dispositif d'application du procédé
EP0406792A1 (fr) Couplage de réglage pour la course supérieure pour la jumelle de pression d'un dispositif d'emboutissage
DE1015665B (de) Schmiedepresse, insbesondere fuer Kurbelwellen
DE1627324B1 (de) Hydraulisch betätigte Einrichtung zum Steuern von Öldruckstempeln
DE3915263C2 (de) Spindelpresse
DE1028927B (de) Mechanische zweistufige Plattenpresse
DE1145018B (de) Schnellarbeitende hydraulische Presse, insbesondere Schmiedepresse oder Ziehpresse
DD272963A3 (de) Pneumo-hydraulisches kissen fuer pressen zum abstreifen der blechteile aus dem werkzeug nach dem umformprozess bzw. zum gegenhalten waehrend des ziehvorganges
DE3416792A1 (de) Anordnung zur steuerung von ziehkissen
DE1913255C (de) Gegenschlaghammer mit einem hydraulisch gekoppelten Antrieb des Ober und des Unterbaren
DE2159279A1 (de) Schlagspindelpresse zum pressen von fliesen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): DE FR GB IT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19840208

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ZEIDLER, ROLF

Inventor name: PETTER, WIELAND

Inventor name: GEIST, GREGOR

Inventor name: ZEMANN, GERD

Inventor name: DUENISCH, KLAUS