EP0268893B1 - Drawing device for a press - Google Patents

Drawing device for a press Download PDF

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Publication number
EP0268893B1
EP0268893B1 EP87116279A EP87116279A EP0268893B1 EP 0268893 B1 EP0268893 B1 EP 0268893B1 EP 87116279 A EP87116279 A EP 87116279A EP 87116279 A EP87116279 A EP 87116279A EP 0268893 B1 EP0268893 B1 EP 0268893B1
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EP
European Patent Office
Prior art keywords
pressure
piston
control
cylinder
effective surface
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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
EP87116279A
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German (de)
French (fr)
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EP0268893A2 (en
EP0268893A3 (en
Inventor
Siegfried Baur
Rudi Brandstetter
Gerhard Roos
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L Schuler GmbH
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L Schuler GmbH
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Publication date
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Publication of EP0268893A2 publication Critical patent/EP0268893A2/en
Publication of EP0268893A3 publication Critical patent/EP0268893A3/en
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Publication of EP0268893B1 publication Critical patent/EP0268893B1/en
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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 drawing device for a press of a generic type, which is known for example from EP-A-0 074 421.
  • 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 sheet held between the sheet holder and the drawing ring is deformed on the press table by the drawing die of the active tool half.
  • the ram In addition to the holding force to be exerted by the drawing device, the ram must also overcome the inertia force which comes into effect as a result of the acceleration of the movable sheet metal holder and drawing device masses at the start of the deformation.
  • This unit must apply the pressure required for the pre-acceleration against the action of the pulling device.
  • the hydraulic fluid for the main pressures of pulling, if necessary locking the pulling device and the pre-acceleration and the hydraulic fluid for the control are removed from one and the same tub.
  • the movement of the piston rod of the pulling device in the pre-acceleration phase is time-controlled.
  • the pre-acceleration must end at the time when the maximum ram movement (bottom dead center) of the ram is reached.
  • the sheet is held evenly at the start of the drawing phase.
  • the pressure cylinder 2 in Fig. 1 is attached via its cylinder flange 1 in the frame of the press, possibly in the press table.
  • the piston rod 3, which can be moved in and against the direction of pull 43, is rigidly connected to the actual pulling device, which, as shown in EP-A-0 074 421, serves to hold the sheet holder against the pull.
  • the pressure cylinder 2 is surrounded in its upper part by a reservoir 4 for hydraulic fluid, which is fluidly connected to a tank 5.
  • the level in reservoir 4 and tank 5, which drops due to, for example, leakage losses, is supplemented by a motor-pump unit 35.
  • the pressure chamber 6, in conjunction with the pressure piston 10, is used for the controlled run-up of the piston rod 3 for ejecting the workpiece from the tool, as e.g. has been described in detail in DE-A1-35 05 984.
  • the run-up control takes place via the pressure line 7 and the control block 8, the overrun of hydraulic fluid during the shaping via the check valve-equipped line 36.
  • a line for the return from the control block 8 into the reservoir 4 is positioned at 9.
  • the line 11 is used for ventilation.
  • the piston rod 3 extends in the downwardly extended part into a pressure chamber 12 and here has a pressure piston 15.
  • the attached collar 14 is displaceable on the piston rod 3 with the pressure piston 15 and serves to limit the run-up of the piston rod 3.
  • the pressure piston 15 forms an active surface 13 which delimits the pressure chamber 12 and can be acted upon in the pulling direction 43.
  • the pressure chamber 12 filled with hydraulic fluid stands with a pressure volume space 18 of a pre-acceleration cylinder 16 in fluid communication.
  • this cylinder 16 comprises a further pressure chamber 19 which is separated from the pressure volume chamber 18 by the piston 17.
  • the amount of hydraulic fluid in the pressure volume space 18 can be adjusted to a certain amount via, for example, automatically adjustable stops.
  • the pressure chamber 19 facing away from the pressure volume space 18 can be brought into flow connection with a pressure accumulator 22 via a pressure line 20 and a throttling directional valve 21, for example a so-called prop valve.
  • the pressure in the pressure accumulator 22 is applied via a motor-pump unit 24.
  • the throttling directional control valve 21 is controlled by the press control via the control line 44 as a function of the movement of the drawing ram. Filters, oilers, water separators, pressure transducers, means for reducing and indicating the pressure and the like are not shown in the circuit diagram, since these means and their use are generally known.
  • the pressure in the pressure chamber 19 can be reduced via the return line 37 and the return control 23 into the trough 38, specifically when the piston rod 3 is raised (ejecting the workpiece).
  • the pressure piston 17 is connected via its piston rod 28 to the piston of the return pressure cylinder 27 rigidly connected.
  • the pressure piston 17 is to be withdrawn completely, for example up to stops for regulating the pressure quantity.
  • the return pressure cylinder 27 is controlled via the return control 29, which is connected to the general control pressure line 26.
  • the pressure in the control line 26 is applied via the motor-pump unit 25.
  • the pressure chamber 12 for the pre-acceleration is also connected to the reservoir 4 via a follow-up control with a valve 30 and a follow-up line 34.
  • the valve seat 33 opens in the suction phase of the pressure chamber 12 when the piston 17 in the pre-acceleration cylinder 16 is moved into its left position, which takes up the pressure volume chamber 18, that is to say after the pre-acceleration phase 41 of the piston rod 3.
  • the valve seat is in the run-up phase of the piston rod 3 33 to open, wherein the pressure piston 17 has assumed its shown right position and the pressure volume space 18 is completely filled with hydraulic fluid.
  • the valve seat 33 is controlled in the open position by means of a control piston 32 to which control pressure from the general control pressure line 26 can be applied.
  • a 2/2-way valve 31 is introduced into the control pressure line 26 for this purpose, via a control line 45 coming from the press control depending on the position or movement phase of the ram must be opened.
  • FIG. 2 shows in a diagram the curve 39 for a possible movement of the drawing ram and the curve 40 for the movement of the sheet metal holder.
  • the sheet metal holder is pre-accelerated during the working stroke of the drawing ram.
  • the drawing ram strikes the lowering sheet metal with the upper part of the tool attached to it.
  • hydraulic fluid is sucked in from the reservoir 4 into the pressure chamber 12 via the follow-up control 30.

Description

Die Erfindung betrifft eine Zieheinrichtung für eine Presse gattungsbildender Art, die beispielsweise aus der EP-A-0 074 421 bekannt ist.The invention relates to a drawing device for a press of a generic type, which is known for example from EP-A-0 074 421.

Bei dem Arbeitshub des Ziehstößels einer Presse wird zunächst das in das Werkzeug eingelegte Blech durch den Ziehring gegen den Blechhalter gedrückt und danach zusammen mit dem Blechhalter entgegen der von der Zieheinrichtung aufgebrachten Haltekraft verschoben. Das zwischen dem Blechhalter und dem Ziehring gehaltene Blech wird durch den Ziehstempel der Wirkzeughälfte auf dem Pressentisch verformt. Neben der von der Zieheinrichtung aufzubringenden Haltekraft muß der Ziehstößel auch die Massenträgkeitskraft, die durch die Beschleunigung der beweglichen Blechhalter- und Zieheinrichtungsmassen zum Anfang der Verformung zur Wirkung kommen, überwinden.During the working stroke of the ram of a press, 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 sheet held between the sheet holder and the drawing ring is deformed on the press table by the drawing die of the active tool half. In addition to the holding force to be exerted by the drawing device, the ram must also overcome the inertia force which comes into effect as a result of the acceleration of the movable sheet metal holder and drawing device masses at the start of the deformation.

Zur Vermeidung der hierbei schlagartig auftretenden Belastung auf den Ziehstößel ist es bei der Zieheinrichtung nach der EP-A1-0 074 421 bekannt, die mehrere Druckstangen für den Blechhalter tragende Druckwange über eine druckmittelbeaufschlagbare Kolbenstange eines pressenfesten Druckzylinders zu bewegen. Die Kolbenstange ist mit einem Druckkolben wirkverbunden, der eine in Ziehrichtung beaufschlagbare Wirkfläche aufweist. Die Wirkfläche ist über eine stößelwegabhängig arbeitende Steuerung druckbeaufschlagbar, so daß hierdurch vor dem Aufsetzen des Ziehstößels auf den Blechhalter dieser in Ziehrichtung vorbeschleunigbar ist. Der der Wirkfläche zugeordnete Druckraum wird direkt aus der Wanne über ein Motor-Pumpen-Aggregat versorgt. Dieses Aggregat muß den für die Vorbeschleunigung erforderlichen Druck gegen die Wirkung des Ziehapparates aufbringen. Die Hydraulikflüssigkeit für die Hauptdrücke des Ziehens, ggf. des Sperrens der Zieheinrichtung und des Vorbeschleunigens und die Hydraulikflüssigkeit für die Steuerung werden ein und derselben Wanne entnommen. Die Bewegung der Kolbenstange der Zieheinrichtung in der Vorbeschleunigungsphase ist zeitgesteuert. Die Vorbeschleunigung muß zeitlich enden mit dem Erreichen der maximalen Umformbewegung (unterer Totpunkt) des Ziehstössels.In order to avoid the sudden impact on the drawing plunger, it is known in the drawing device according to EP-A1-0 074 421 to move the pressure cheek carrying a plurality of pressure rods for the sheet metal holder via a piston rod of a press-fit pressure cylinder which can be pressurized with pressure medium. The piston rod is operatively connected to a pressure piston which has an active surface which can be acted upon in the direction of pull. The active surface can be pressurized via a control which operates in relation to the ram, so that this allows the drawing ram to be pre-accelerated in the drawing direction before the drawing ram is placed on it. The pressure area assigned to the effective area is supplied directly from the tub via a motor-pump unit. This unit must apply the pressure required for the pre-acceleration against the action of the pulling device. The hydraulic fluid for the main pressures of pulling, if necessary locking the pulling device and the pre-acceleration and the hydraulic fluid for the control are removed from one and the same tub. The movement of the piston rod of the pulling device in the pre-acceleration phase is time-controlled. The pre-acceleration must end at the time when the maximum ram movement (bottom dead center) of the ram is reached.

Demgegenüber ist es Aufgabe der Erfindung, die Vorbeschleunigung der Kolbenstange in Ziehrichtung über eine gezielt vorgegebene (dosierte) Menge an Hydraulikflüssigkeit zu steuern und den Nachlauf an Hydraulikflüssigkeit während der Weiterbewegung der Kolbenstange in Ziehrichtung aus einem Reservoir zu steuern.In contrast, it is an object of the invention to control the pre-acceleration of the piston rod in the pulling direction via a specifically predetermined (metered) amount of hydraulic fluid and to control the overrun of hydraulic fluid during the further movement of the piston rod in the pulling direction from a reservoir.

Diese Aufgabe wird gelöst durch die im Anspruch 1 angegebenen Merkmale. Die Merkmale der weiteren Ansprüche bilden vorteilhafte Ausgestaltungen der Erfindung.This object is achieved by the features specified in claim 1. The features of the further claims form advantageous embodiments of the invention.

Die Relativbewegung zwischen dem Ziehstößel und dem Blechhalter bei dem Arbeitshub des Ziehstößels kann gegen einen Wert = 0 gesteuert und der Auftreffschlag kann völlig unterbunden werden. Hierdurch werden Druckschwingungen zwischen dem Blech und dem Blechhalter vermieden. Das Blech wird bereits im Beginn der Ziehphase gleichmäßig gehalten.The relative movement between the ram and the sheet metal holder during the working stroke of the ram can be controlled against a value = 0 and the impact impact can be completely prevented. This avoids pressure vibrations between the sheet and the sheet holder. The sheet is held evenly at the start of the drawing phase.

Anhand eines Ausführungsbeispiels in der Zeichnung soll die Erfindung im folgenden erläutert werden. Es zeigen

Fig. 1
einen Vertikalschnitt durch den Vorbeschleunigungsbereich einer Zieheinrichtung mit den Schaltungsmaßnahmen für die Vorbeschleunigung und
Fig. 2
ein Diagramm zur Darstellung der Bewegungsabläufe von Ziehstößel und Blechhalter während der Umformung eines Blechteils.
The invention will be explained below using an exemplary embodiment in the drawing. Show it
Fig. 1
a vertical section through the pre-acceleration area of a pulling device with the circuit measures for the pre-acceleration and
Fig. 2
a diagram to illustrate the movements of the ram and sheet holder during the forming of a sheet metal part.

Der Druckzylinder 2 in Fig. 1 ist über seinen Zylinderflansch 1 im Gestell der Presse, ggf. im Pressentisch, befestigt. Die in und entgegen der Ziehrichtung 43 bewegbare Kolbenstange 3 steht mit dem eigentlichen Ziehapparat in starrer Verbindung, der, wie es die EP-A-0 074 421 zeigt, der Gegenhaltung durch den Blechhalter bei dem Ziehen dient. Der Druckzylinder 2 ist in seinem oberen Teil von einem Reservoir 4 für Hydraulikflüssigkeit umgeben, der mit einem Tank 5 fließverbunden ist. Das durch z.B. Leckverluste absinkende Niveau in Reservoir 4 und Tank 5 wird über ein Motor-Pumpen-Aggregat 35 ergänzt.The pressure cylinder 2 in Fig. 1 is attached via its cylinder flange 1 in the frame of the press, possibly in the press table. The piston rod 3, which can be moved in and against the direction of pull 43, is rigidly connected to the actual pulling device, which, as shown in EP-A-0 074 421, serves to hold the sheet holder against the pull. The pressure cylinder 2 is surrounded in its upper part by a reservoir 4 for hydraulic fluid, which is fluidly connected to a tank 5. The level in reservoir 4 and tank 5, which drops due to, for example, leakage losses, is supplemented by a motor-pump unit 35.

Der Druckraum 6 dient in Verbindung mit dem Druckkolben 10 dem gesteuerten Hochlauf der Kolbenstange 3 zum Ausstoßen des Werkstücks aus dem Werkzeug, wie es z.B. in der DE-A1-35 05 984 ausführlich beschrieben worden ist. Die Hochlaufsteuerung erfolgt über die Druckleitung 7 und den Steuerblock 8, der Nachlauf von Hydraulikflüssigkeit während des Umformens über die Rückschlagventil-bestückte Leitung 36. Mit 9 ist eine Leitung für den Rücklauf aus dem Steuerblock 8 in das Reservoir 4 positioniert. Die Leitung 11 dient der Entlüftung.The pressure chamber 6, in conjunction with the pressure piston 10, is used for the controlled run-up of the piston rod 3 for ejecting the workpiece from the tool, as e.g. has been described in detail in DE-A1-35 05 984. The run-up control takes place via the pressure line 7 and the control block 8, the overrun of hydraulic fluid during the shaping via the check valve-equipped line 36. A line for the return from the control block 8 into the reservoir 4 is positioned at 9. The line 11 is used for ventilation.

Die Kolbenstange 3 reicht in dem nach unten verlängerten Teil bis in einen Druckraum 12 und weist hier einen Druckkolben 15 auf. Der aufgesetzte Bund 14 ist auf der Kolbenstange 3 mit dem Druckkolben 15 verschiebbar und dient der Hochlaufbegrenzung der Kolbenstange 3. Der Druckkolben 15 bildet eine den Druckraum 12 begrenzende, mit in Ziehrichtung 43 beaufschlagbare Wirkfläche 13. Der mit Hydraulikflüssigkeit gefüllte Druckraum 12 steht mit einem Druckmengenraum 18 eines Vorbeschleunigungszylinders 16 in Fließverbindung. Neben dem Gehäuse umfaßt dieser Zylinder 16 einen weiteren Druckraum 19, der von dem Druckmengenraum 18 durch den Kolben 17 getrennt ist. Für eine gezielte Vorbeschleunigung der Kolbenstange 3 in Ziehrichtung 43 in der Vorbeschleunigungsphase 41, erkennbar in Fig. 2, ist die Menge Hydraulikflüssigkeit in dem Druckmengenraum 18 auf eine bestimmte Menge über z.B. automatisch verstellbare Anschläge einstellbar. Der dem Druckmengenraum 18 abgewandte Druckraum 19 ist über eine Druckleitung 20 und ein drosselndes Wegeventil 21, z.B. ein sog. Prop-Ventil, mit einem Druckspeicher 22 in Fließverbindung bringbar. Der Druck in dem Druckspeicher 22 wird über ein Motor-Pumpen-Aggregat 24 aufgebracht. Die Ansteuerung des drosselnden Wegeventils 21 erfolgt von der Pressensteuerung über die Steuerleitung 44 in Abhängigkeit von der Bewegung des Ziehstößels. Filter, Öler, Wasserabscheider, Druckaufnehmer Mittel zur Druckreduzierung und - Anzeige und dgl. sind in dem Schaltplan nicht gezeigt, da diese Mittel und deren Verwendung allgemein geläufig sind. Der Druck in dem Druckraum 19 ist über die Rücklaufleitung 37 und die Rücklaufsteuerung 23 in die Wanne 38 abbaubar und zwar bei dem Hochfahren (Auswerfen des Werkstücks) der Kolbenstange 3. Der Druckkolben 17 ist über seine Kolbenstange 28 mit dem Kolben des Rückhol-Druckzylinders 27 starr verbunden. Bei dem Hochfahren der Kolbenstange 3 muß die erforderliche Menge an Hydraulikflüssigkeit in dem Druckmengenraum 18 für die folgende Vorbeschleunigungsphase bereitstehen. Der Druckkolben 17 ist hierfür vollständig, z.B. bis gegen Anschläge für die Druckmengenregulierung, zurückzuziehen. Die Steuerung des Rückhol- Druckzylinders 27 erfolgt über die Rücklaufsteuerung 29, die an die allgemeine Steuerdruckleitung 26 angeschlossen ist. Der Druck in der Steuerleitung 26 wird über das Motor-Pumpen-Aggregat 25 aufgebracht.The piston rod 3 extends in the downwardly extended part into a pressure chamber 12 and here has a pressure piston 15. The attached collar 14 is displaceable on the piston rod 3 with the pressure piston 15 and serves to limit the run-up of the piston rod 3. The pressure piston 15 forms an active surface 13 which delimits the pressure chamber 12 and can be acted upon in the pulling direction 43. The pressure chamber 12 filled with hydraulic fluid stands with a pressure volume space 18 of a pre-acceleration cylinder 16 in fluid communication. In addition to the housing, this cylinder 16 comprises a further pressure chamber 19 which is separated from the pressure volume chamber 18 by the piston 17. For a specific pre-acceleration of the piston rod 3 in the pulling direction 43 in the pre-acceleration phase 41, as can be seen in FIG. 2, the amount of hydraulic fluid in the pressure volume space 18 can be adjusted to a certain amount via, for example, automatically adjustable stops. The pressure chamber 19 facing away from the pressure volume space 18 can be brought into flow connection with a pressure accumulator 22 via a pressure line 20 and a throttling directional valve 21, for example a so-called prop valve. The pressure in the pressure accumulator 22 is applied via a motor-pump unit 24. The throttling directional control valve 21 is controlled by the press control via the control line 44 as a function of the movement of the drawing ram. Filters, oilers, water separators, pressure transducers, means for reducing and indicating the pressure and the like are not shown in the circuit diagram, since these means and their use are generally known. The pressure in the pressure chamber 19 can be reduced via the return line 37 and the return control 23 into the trough 38, specifically when the piston rod 3 is raised (ejecting the workpiece). The pressure piston 17 is connected via its piston rod 28 to the piston of the return pressure cylinder 27 rigidly connected. When the piston rod 3 is raised, the required amount of hydraulic fluid in the pressure volume space 18 must be used for the following pre-acceleration phase stand by. For this purpose, the pressure piston 17 is to be withdrawn completely, for example up to stops for regulating the pressure quantity. The return pressure cylinder 27 is controlled via the return control 29, which is connected to the general control pressure line 26. The pressure in the control line 26 is applied via the motor-pump unit 25.

Der Druckraum 12 für die Vorbeschleunigung ist weiterhin über eine Nachlaufsteuerung mit einem Ventil 30 und eine Nachlaufleitung 34 an das Reservoir 4 angeschlossen. Der Ventilsitz 33 öffnet in der Saugphase des Druckraumes 12 dann, wenn der Kolben 17 in dem Vorbeschleunigungszylinder 16 in seine linke, den Druckmengenraum 18 einnehmende Stellung bewegt ist, also nach der Vorbeschleunigungsphase 41 der Kolbenstange 3. In der Hochlaufphase der Kolbenstange 3 ist der Ventilsitz 33 zu öffnen, wobei der Druckkolben 17 seine gezeigte rechte Position eingenommen hat und der Druckmengenraum 18 vollständig mit Hydraulikflüssigkeit angefüllt ist. Die Steuerung des Ventilsitzes 33 in die Offen-Stellung erfolgt über einen mit Steuerdruck aus der allgemeinen Steuerdruckleitung 26 beaufschlagbaren Steuerkolben 32. In die Steuerdruckleitung 26 ist hierfür ein 2/2 Wegeventil 31 eingebracht, das über eine von der Pressensteuerung kommende Steuerleitung 45 in Abhängigkeit von der Stellung bzw. Bewegungsphase des Ziehstößels zu öffnen ist.The pressure chamber 12 for the pre-acceleration is also connected to the reservoir 4 via a follow-up control with a valve 30 and a follow-up line 34. The valve seat 33 opens in the suction phase of the pressure chamber 12 when the piston 17 in the pre-acceleration cylinder 16 is moved into its left position, which takes up the pressure volume chamber 18, that is to say after the pre-acceleration phase 41 of the piston rod 3. The valve seat is in the run-up phase of the piston rod 3 33 to open, wherein the pressure piston 17 has assumed its shown right position and the pressure volume space 18 is completely filled with hydraulic fluid. The valve seat 33 is controlled in the open position by means of a control piston 32 to which control pressure from the general control pressure line 26 can be applied. A 2/2-way valve 31 is introduced into the control pressure line 26 for this purpose, via a control line 45 coming from the press control depending on the position or movement phase of the ram must be opened.

Fig. 2 zeigt in einem Diagramm die Kurve 39 für eine mögliche Bewegung des Ziehstößels sowie die Kurve 40 der Bewegung des Blechhalters. Während des Arbeitshubes des Ziehstößels wird der Blechhalter vorbeschleunigt. Mit Beendigung der Vorbeschleunigungsphase 41 trifft der Ziehstößel mit dem an diesem angebrachten Werkzeugoberteil auf dem sich absenkenden Blech auf. In der sich daran anschließenden Nachlaufphase 42 wird Hydraulikflüssigkeit über die Nachlaufsteuerung 30 aus dem Reservoir 4 in den Druckraum 12 nachgesaugt.2 shows in a diagram the curve 39 for a possible movement of the drawing ram and the curve 40 for the movement of the sheet metal holder. The sheet metal holder is pre-accelerated during the working stroke of the drawing ram. At the end of the pre-acceleration phase 41, the drawing ram strikes the lowering sheet metal with the upper part of the tool attached to it. In the subsequent follow-up phase 42, hydraulic fluid is sucked in from the reservoir 4 into the pressure chamber 12 via the follow-up control 30.

Claims (3)

  1. Drawing device for a press with a mechanically moved drawing slide and with a plate holder, of which the holding force acting on the plate opposite to the drawing direction (43) is applied via a piston rod (3) subjected to pressure medium and belonging to a pressure cylinder (2) fixed to the press, the piston rod (3) being connected operatively to a pressure piston (15) having an effective surface (13) loadable in the drawing direction (43), and there being a control which works as a function of the slide travel and by means of which, before the drawing slide is applied to the plate holder, the latter can be preaccelerated in the drawing direction (43) by loading the effective surface (13) with hydraulic fluid, characterised in that the pressure space (12) assigned to the effective surface (13) of the pressure piston (15) on the one hand has a flow connection with the pressure-quantity space (18) of a preacceleration cylinder (16) composed of the pressure-quantity space (18), a pressure space (19) and a pressure piston (17) separating these spaces (18, 19) from one another, the pressure space (19) of the preacceleration cylinder being loadable with pressure via a throttling directional valve (21) by the control working as a function of the slide travel, and on the other hand, via a follow-up control (30, 31) loadable by the control working as a function of the slide travel, can be flow-connected with a reservoir (4) for hydraulic fluid at the termination of the preacceleration of the pressure piston (15).
  2. Drawing device according to Claim 1, characterised in that the pressure piston (17) of the preacceleration cylinder (16) is connected operatively via its piston rod (28) to the piston of a recuperating pressure cylinder (27).
  3. Drawing device according to Claim 1, characterised in that the follow-up control (30, 31) has a directional valve (30) with a valve seat (33) which opens under suction pressure in the direction of the pressure space (12) assigned to the effective surface (13) and closes under dynamic pressure in the pressure space (12) assigned to the effective surface (13) and which can be opened to pressure via a pilot-control valve (31) for the movement of the piston rod (3) opposite to the drawing direction (43), so as to make a flow connection between the pressure space (12) assigned to the effective surface (13) and the reservoir (4).
EP87116279A 1986-11-28 1987-11-05 Drawing device for a press Expired - Lifetime EP0268893B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3640788 1986-11-28
DE19863640788 DE3640788A1 (en) 1986-11-28 1986-11-28 DRAWING DEVICE FOR A PRESS

Publications (3)

Publication Number Publication Date
EP0268893A2 EP0268893A2 (en) 1988-06-01
EP0268893A3 EP0268893A3 (en) 1989-12-27
EP0268893B1 true EP0268893B1 (en) 1992-08-19

Family

ID=6315065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116279A Expired - Lifetime EP0268893B1 (en) 1986-11-28 1987-11-05 Drawing device for a press

Country Status (5)

Country Link
US (1) US4896594A (en)
EP (1) EP0268893B1 (en)
CA (1) CA1280039C (en)
DE (2) DE3640788A1 (en)
ES (1) ES2033768T3 (en)

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Also Published As

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DE3781244D1 (en) 1992-09-24
DE3640788A1 (en) 1988-06-01
CA1280039C (en) 1991-02-12
ES2033768T3 (en) 1993-04-01
EP0268893A2 (en) 1988-06-01
US4896594A (en) 1990-01-30
EP0268893A3 (en) 1989-12-27

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