EP0406792B1 - Control switch connection for the upward stroke of the pressure cheek of a deep drawing device - Google Patents

Control switch connection for the upward stroke of the pressure cheek of a deep drawing device Download PDF

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Publication number
EP0406792B1
EP0406792B1 EP90112668A EP90112668A EP0406792B1 EP 0406792 B1 EP0406792 B1 EP 0406792B1 EP 90112668 A EP90112668 A EP 90112668A EP 90112668 A EP90112668 A EP 90112668A EP 0406792 B1 EP0406792 B1 EP 0406792B1
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EP
European Patent Office
Prior art keywords
blocking
control
flow
pressure
valve
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EP90112668A
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German (de)
French (fr)
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EP0406792A1 (en
Inventor
Siegfried Baur
Gerhard Roos
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L Schuler GmbH
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L Schuler GmbH
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    • 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
    • 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 control circuit according to the preamble of claim 1.
  • a control circuit is known for example from DE-A-35 05 984.
  • the run-up control of the pressure cheek acted on by the drawing cylinders starts when the bottom dead center passes through the ram - the end of the forming in the machining level.
  • the acceleration control provides for the pressure cheek to either be lifted directly with the tappet or the lifting movement of the pressure cheek to be initiated with a delay to the upward movement of the tappet.
  • the lifting or run-up movement of the pressure cheek is steamed before reaching the raised position. H. in a delayed motion.
  • DE-A-35 21 698 controls the run-up movement in the phases by means of a throttle valve between the oil reservoir and the space.
  • the respective instantaneous settings or pressure cheek and the throttle valve are queried.
  • These values, as well as the actual drawing pressure, are fed to a program-controlled comparator and compared with corresponding target values.
  • the comparator On the output side, the comparator is connected to a control device for the cushion pressure and, via a pilot control, to an actuating cylinder of the throttle valve.
  • the run-up movement of the pressure cheek in the individual movement phases is curve-guided in DE-A-35 05 984.
  • the piston rod of the ejector cylinder or locking cylinder is provided with a curve for setting the flow cross section of a pilot valve.
  • the control circuit for the startup according to the invention comes e.g. to be used in drawing apparatuses in which the drawing pressure - sheet metal holder force - is to be adjusted to the drawing conditions in the individual pressure points.
  • the object of the invention is to reduce the means.
  • the control circuit is intended on the one hand to achieve a stepless transition into and into the run-up phase, on the other hand the damping phase and the transition to the stop are to be uniformly delayed and without vibration.
  • the different drawing pressures of sheet metal parts to be shaped differently must be taken into account.
  • the ram curve in Fig. 1 is predetermined by the drive means of the press.
  • the path of the pressure cheek (3 in Fig. 3) is indicated with the ZE path.
  • the control circuit provides at bottom dead center UT, after the end of the pulling process, either bringing the pressure cheek 3 directly up with the upward movement of the ram or bringing it up with a delay.
  • the start of the start-up can be determined, for example, by means of electrical / electronic switching means and can open a valve or the 2-way valves 26 (FIGS. 2 + 3).
  • the indicated vaporization phase is indicated by
  • the reduction in cross-section in the outlet from the restricted spaces 9 to the reservoir 12 is effected by closing the valves 26 and the valves 17 of the parallel circuit 16. Inlet against the stop, represented by the ZE-OT line, is carried out by further reducing the cross-section, as explained in detail below becomes.
  • Fig. 2 shows the functional groups of the control of the drawing device 1.
  • single-acting pressure cylinders - air cylinders - are indicated with the locking cylinders 7 assigned to them.
  • the pressure cheek 3 is supported by these cylinders, and on the other hand, this causes the run-up movement.
  • a 2-way valve 26 e.g. a 2-way cartridge valve is switched, which is controlled from a common pilot control unit 31 all 2-way valves.
  • the control lines 37, 37 ' start from a common output of the pilot unit 31. The further positions not mentioned are explained below in relation to FIG. 3.
  • Fig. 3 the indicated pressure cheek 3 is supported by pressure cylinder 4.
  • the piston rods 8 are guided down through the locking cylinder 7 and carry pistons. At least one of the piston rods 8 also carries a group of switches 11 which can be set at the lower end region.
  • the parallel connection 16 comprises a number of 2-way valves 17, here three 2-way cartridge valves housed in a control block.
  • the control current connections 18 of these valves are connected via switchable directional valves 19 to the blocking space 9 of the blocking cylinder 7.
  • the working connection 21 is connected to the reservoir 12 via the drain line 20.
  • the working connection 22 is in direct connection with the blocking space 9.
  • Each of the blocking spaces 9 is also connected to the 2-way valve 26 or a 2-way cartridge valve.
  • the working connection 28 is connected directly to the blocking space 9.
  • the working connection 27 is directly connected to the reservoir 12 via the drain line 29.
  • the control current connection 30 can be pressurized by the pilot control unit 31.
  • the pilot control unit 31 is fluidly connected to one of the restricted spaces 9 through the pressure line 39.
  • the pressure in the blocking space 9 is applied via a directional valve 38 to the control flow connection 33 of a two-way valve 32, which can be a built-in directional valve.
  • the working connection 35 is connected to the drain line 20 leading to the reservoir 12.
  • the working connection 34 is flow-connected via the control lines 37, 37 'to the control current connections 30 of all 2-way valves 26.
  • a throttle check valve 36 is switched on in the pilot control unit 31. Between the pressure line 39 leading from the blocking space 9 to the directional control valve 38 and the line leading from the working connection 34 of the 2-way valve 32 to the throttle check valve 36 there is a flow connection through the connecting line 40, the check valve 41 and the throttle 42. The check valve 41 is turned on blocking direction 9.
  • the switches 11 can be actuated by means of cam control and thus directional valves 19 can be switched in the parallel connection 16.
  • the switching of these directional valves 19 from the shown in the possible switching position causes the opening of the 2-way valves 17 of the parallel circuit 16 and thus an increase in the flow cross section from the space 9 through the drain line 20.
  • the run-up of the pressure cheek 3 is thus freely adjustable, in particular The pressures set discretely in the individual drawing cylinders 4 can be dealt with. Low pulling forces require larger flow cross sections and vice versa.
  • the directional control valve 38 and, if required, the directional control valve 19 are switched to the positions shown via switches in the switch group 11.
  • the 2-way valves 1 and 26 close.
  • the 2-way valve 26 is provided with a damping pin 25 and, together with the pilot control unit 31 and the throttle 42 and throttle check valve 36 built therein, and the throttle check valve 36 determine a stepless, vibration-free decelerating braking operation into the stop ZE-OT.

Description

Die Erfindung betrifft eine Regelschaltung nach dem Oberbegriff des Anspruchs 1. Eine derartige Regelschaltung ist beispielsweise aus der DE-A-35 05 984 bekannt.The invention relates to a control circuit according to the preamble of claim 1. Such a control circuit is known for example from DE-A-35 05 984.

Um werkzeugspezifischen Erfordernissen zu entsprechen, setzt die Hochlaufregelung der von den Ziehzylindern beaufschlagten Druckwange mit dem Durchlaufen des unteren Totpunkts durch den Stößel - Ende der Umformung in der Bearheitungsstufe - ein. Die Hochlaufregelung sieht vor die Druckwange entweder direkt mit dem Stößel anzuheben, oder die Anhebebewegung der Druckwange verzögert zu der Aufwärtsbewegung des Stößels einzuleiten. Die Anhebe- oder Hochlaufbewegung der Druckwange erfolgt vor Erreichen der angehobenen lage gedampft, d. h. in einer verzogerten Bewegung.In order to meet tool-specific requirements, the run-up control of the pressure cheek acted on by the drawing cylinders starts when the bottom dead center passes through the ram - the end of the forming in the machining level. The acceleration control provides for the pressure cheek to either be lifted directly with the tappet or the lifting movement of the pressure cheek to be initiated with a delay to the upward movement of the tappet. The lifting or run-up movement of the pressure cheek is steamed before reaching the raised position. H. in a delayed motion.

Ziehapparate mit Steuerung bzw. Regelung der Hochlaufbewegung der Druckwange, der Auswerferbewegung des Ziehteils und der gedämpften Bewegung in den Endanschlag sind bekannt.Drawers with control or regulation of the run-up movement of the pressure cheek, the ejector movement of the drawn part and the damped movement into the end stop are known.

In der DE-A-35 21 698 erfolgt eine Steuerung der Hochlaufbewegung in den Phasen vermittels Drosselventil zwischen Ölvorratsbehälter und Sperraum. Hierbei werden die jeweiligen Momentanstellungen oder Druckwange und des Drosselventils abgefragt. Diese Werte, sowie der Ist-Ziehdruck, werden eine programmgesteuerten Vergleicher zugeführt und mit entsprechenden Sollwerten verglichen. Der Vergleicher ist ausgangsseitig mit einer Regeleinrichtung für den Kissendruck und über eine Vorsteuerung nit eine Stellzylinder des Drosselventils verbunden.DE-A-35 21 698 controls the run-up movement in the phases by means of a throttle valve between the oil reservoir and the space. The respective instantaneous settings or pressure cheek and the throttle valve are queried. These values, as well as the actual drawing pressure, are fed to a program-controlled comparator and compared with corresponding target values. On the output side, the comparator is connected to a control device for the cushion pressure and, via a pilot control, to an actuating cylinder of the throttle valve.

Für gleiche Anwendung ist in der DE-A-35 05 984 die Hochlaufbewegung der Druckwange in den einzelnen Bewegungsphasen kurvengeführt. Hierfür ist die Kolbenstange des Auswerferzylinders bzw. Sperrzylinders mit einer Kurve versehen zum Einstellen des Fließquerschnitts eines Vorsteuerventils.For the same application, the run-up movement of the pressure cheek in the individual movement phases is curve-guided in DE-A-35 05 984. For this purpose, the piston rod of the ejector cylinder or locking cylinder is provided with a curve for setting the flow cross section of a pilot valve.

Die Regelschaltung für den Hochlauf gemäß der Erfindung kommt z.B. bei solchen Ziehapparaten zur Anwendung, bei denen der Ziehdruck - Blechhalterkraft - in den einzelnen Druckpunkten auf die Ziehverhältnisse einzustellen ist. Hierbei ist Aufgabe der Erfindung die Verringerung der Mittel. Insbesondere soll vermittels der Regelschaltung einerseits ein stufenloser Übergang in die Hochlaufphase und in dieser erreicht werden, andererseits soll die Dampfungsphase und der Übergang in den Anschlag gleichmäßig verzögert und schwingungslos erfolgen. Hierbei sind die verschiedenen Ziehdrücke unterschiedlich zu formender Blechteile zu berücksichtigen.The control circuit for the startup according to the invention comes e.g. to be used in drawing apparatuses in which the drawing pressure - sheet metal holder force - is to be adjusted to the drawing conditions in the individual pressure points. The object of the invention is to reduce the means. In particular, the control circuit is intended on the one hand to achieve a stepless transition into and into the run-up phase, on the other hand the damping phase and the transition to the stop are to be uniformly delayed and without vibration. Here, the different drawing pressures of sheet metal parts to be shaped differently must be taken into account.

Die Aufgabe ist ausgehend vom Stand der Technik gemäß dem Oberbegriff des Anspruchs 1 durch die den Anspruch 1 kennzeichnenden Merkmale gelöst. Die Ansprüche 2 und 3 stellen bevorzugte Ausgestaltungen der Erfindung dar.The object is achieved on the basis of the prior art according to the preamble of claim 1 by the features characterizing claim 1. Claims 2 and 3 represent preferred embodiments of the invention.

Besondere Vorteile ergeben sich aus der gemeinsamen Steuerung aller Sperräume vermittels einer Vorsteuereinheit und der Parallelschaltung in Zeit und Fließquerschnitt unterschiedlich ansteuerbarer Ventile. Anhand eines Ausführungsbeispiels wird die Erfindung im folgenden näher erläutert. In der Zeichnung ist dargestellt:

Fig. 1
ein Bewegungsdiagramm von Stößel und Druckwange,
Fig. 2
eine steuerungstechnisch vereinfachte Darstellung des samtaufbaues der Regelschaltung und
Fig. 3
die Regelschaltung im Detail.
Special advantages result from the joint control of all the restricted areas by means of a pilot control unit and the parallel connection in time and flow cross section of valves which can be controlled differently. The invention is explained in more detail below using an exemplary embodiment. The drawing shows:
Fig. 1
a movement diagram of the ram and pressure cheek,
Fig. 2
a control-technically simplified representation of the entire structure of the control circuit and
Fig. 3
the control circuit in detail.

Die Stößelkurve in Fig. 1 ist durch die Antriebsmittel der Presse vorgegeben. Der Weg der Druckwange (3 in Fig. 3) ist mit ZE-Weg angebedeutet. Die Regelschaltung sieht im unteren Totpunkt UT, nach Beendigung des Ziehvorgangs, wahlweise das direkte Hochbringen der Druckwange 3 mit dem der Hochlaufbewegung des Stößels vor oder ein zu dieser verzögertes Hochbringen. Der Zeitpunkt des Beginns des Hochlaufs kann z.B. vermittels elektrischer/elektronischer Schaltmittel bestimmt werden und die Öffnung eines Ventils, bzw. der 2-Wegeventile 26 (Fig. 2 + 3) bewirken. Die angedeutete Dampfungsphase wird durch Querschnittsverringerung im Auslauf aus den Sperräumen 9 zu dem Reservoir 12 bewirkt, so durch Schließen der Ventile 26 und der Ventile 17 der Parallelschaltung 16. Einlauf gegen Anschlag, dargestellt durch die ZE-OT Linie, erfolgt durch weitere Querschnittsverringerung, wie es im einzelnen noch ausgeführt wird.The ram curve in Fig. 1 is predetermined by the drive means of the press. The path of the pressure cheek (3 in Fig. 3) is indicated with the ZE path. The control circuit provides at bottom dead center UT, after the end of the pulling process, either bringing the pressure cheek 3 directly up with the upward movement of the ram or bringing it up with a delay. The start of the start-up can be determined, for example, by means of electrical / electronic switching means and can open a valve or the 2-way valves 26 (FIGS. 2 + 3). The indicated vaporization phase is indicated by The reduction in cross-section in the outlet from the restricted spaces 9 to the reservoir 12 is effected by closing the valves 26 and the valves 17 of the parallel circuit 16. Inlet against the stop, represented by the ZE-OT line, is carried out by further reducing the cross-section, as explained in detail below becomes.

Fig. 2 läßt die Funktionsgruppen der Regelung des Ziehapparats 1 erkennen. Mit 4 sind einfachwirkende Druckzylinder - Luftzylinder - angedeutet mit den diesen zugeordneten Sperrzylindern 7. Durch diese Zylinder wird einerseits die Druckwange 3 abgestützt, andererseits die Hochlaufbewegung dieser bewirkt. Mit 16 wird auf die Parallelschaltung von deren Ventilen bzw. Ventilgruppen hingewiesen zur Fließregelung der aus den Sperrzylindern 7 infolge Hochbringens der Kolben in den Druckzylindern durch den während des Ziehens aufgebauten Druck austretenden Hydraulikflüssigkeit.Fig. 2 shows the functional groups of the control of the drawing device 1. With 4, single-acting pressure cylinders - air cylinders - are indicated with the locking cylinders 7 assigned to them. On the one hand, the pressure cheek 3 is supported by these cylinders, and on the other hand, this causes the run-up movement. At 16, reference is made to the parallel connection of their valves or valve groups for the flow control of the hydraulic fluid escaping from the locking cylinders 7 as a result of the pistons being brought up in the pressure cylinders by the pressure built up during the drawing.

Parallel zu jeder der Parallelschaltungen 16 ist jeweils ein 2-Wegeventil 26, z.B. ein 2-Wege-Einbauventil geschaltet, das aus einer allen 2-Wegeventilen gemeinsamen Vorsteuereinheit 31 angesteuert wird. Die Steuerleitungen 37, 37′ gehen von einem gemeinsamen Ausgang der Vorsteuereinheit 31 aus. Die weiteren und nicht genannten Positionen werden nachfolgend zu Fig. 3 erläutert.In parallel to each of the parallel circuits 16 is a 2-way valve 26, e.g. a 2-way cartridge valve is switched, which is controlled from a common pilot control unit 31 all 2-way valves. The control lines 37, 37 'start from a common output of the pilot unit 31. The further positions not mentioned are explained below in relation to FIG. 3.

In Fig. 3 wird die angedeutete Druckwange 3 durch Druckzylinder 4 abgestützt. Die Kolbenstangen 8 sind nach unten durch die Sperrzylinder 7 hindurch geführt und tragen Kolben. Zumindest eine der Kolbenstangen 8 trägt weiterhin an dem unteren Endbereich eine Gruppe von wegeinstellbaren Schaltern 11.In Fig. 3, the indicated pressure cheek 3 is supported by pressure cylinder 4. The piston rods 8 are guided down through the locking cylinder 7 and carry pistons. At least one of the piston rods 8 also carries a group of switches 11 which can be set at the lower end region.

Die Parallelschaltung 16 umfaßt eine Anzahl an 2-Wegeventilen 17, hier drei in eine Steuerblock untergebrachte 2-Wege-Einbauventile. Die Steuerstromanschlüsse 18 dieser Ventile sind über schaltbare Wegeventile 19 an den Sperraum 9 des Sperrzylinders 7 angeschlossen. Der Arbeitsanschluß 21 ist jeweils über die Ablaßleitung 20 an das Reservoir 12 angeschlossen. Der Arbeitsanschluß 22 steht in direkter Verbindung mit dum Sperraum 9. Jede der Sperräume 9 ist weiterhin das 2-Wegeventil 26 bzw. ein 2-Wege-Einbauventil zugeschaltet. Der Arbeitsanschluß 28 ist direkt an den Sperraum 9 geschaltet. Der Arbeitsanschluß 27 ist über die Ablaßleitung 29 direkt mit dem Reservoir 12 fließverbunden. Der Steuerstromanschluß 30 ist von der Vorsteuereinheit 31 druckbeaufschlagbar.The parallel connection 16 comprises a number of 2-way valves 17, here three 2-way cartridge valves housed in a control block. The control current connections 18 of these valves are connected via switchable directional valves 19 to the blocking space 9 of the blocking cylinder 7. The working connection 21 is connected to the reservoir 12 via the drain line 20. The working connection 22 is in direct connection with the blocking space 9. Each of the blocking spaces 9 is also connected to the 2-way valve 26 or a 2-way cartridge valve. The working connection 28 is connected directly to the blocking space 9. The working connection 27 is directly connected to the reservoir 12 via the drain line 29. The control current connection 30 can be pressurized by the pilot control unit 31.

Die Vorsteuereinheit 31 ist durch die Druckleitung 39 mit einem der Sperräume 9 fließverbunden. Der Druck in dem Sperraum 9 ist über ein Wegeventil 38 an den Steuerstromanschluß 33 eines 2-Wegeventils 32, das ein Einbauwegeventil sein kann, gelegt.The pilot control unit 31 is fluidly connected to one of the restricted spaces 9 through the pressure line 39. The pressure in the blocking space 9 is applied via a directional valve 38 to the control flow connection 33 of a two-way valve 32, which can be a built-in directional valve.

Der Arbeitsanschluß 35 ist an die zu dem Reservoir 12 führende Ablaßleitung 20 angeschlossen. Der Arbeitsanschluß 34 ist über die Steuerleitungen 37, 37′ mit den Steuerstromanschlüssen 30 aller 2-Wegeventile 26 fließverbunden.The working connection 35 is connected to the drain line 20 leading to the reservoir 12. The working connection 34 is flow-connected via the control lines 37, 37 'to the control current connections 30 of all 2-way valves 26.

Vor dem Verzweigungspunkt zu den Steuerstromanschlüssen 30 der 2-Wegeventile 26 ist in die Vorsteuereinheit 31 ein Drosselrückschlagventil 36 eingeschaltet. Zwischen der von dem Sperraum 9 zu dem Wegeventil 38 führenden Druckleitung 39 und der von dem Arbeitsanschluß 34 des 2-Wegeventils 32 zu dem Drosselrückschlagventil 36 führenden Leitung besteht eine Fließverbindung durch die Verbindungsleitung 40, das Rückschlagventil 41 und die Drossel 42. Das Rückschlagventil 41 ist in Richtung Sperraum 9 sperrend eingeschaltet.Before the branch point to the control current connections 30 of the 2-way valves 26, a throttle check valve 36 is switched on in the pilot control unit 31. Between the pressure line 39 leading from the blocking space 9 to the directional control valve 38 and the line leading from the working connection 34 of the 2-way valve 32 to the throttle check valve 36 there is a flow connection through the connecting line 40, the check valve 41 and the throttle 42. The check valve 41 is turned on blocking direction 9.

In der Ziehphase setzen Stößel und Werkzeugoberteil auf dem eingelegten Blech, Blechhalter und Werkzeugunterteil auf. Die Druckwange 3 wird mit dieser Bewegung abwärts bewegt, und es baut sich in den Druckzylindern 4 ein diskret einstellbarer Druck auf. Dieser Druck führt über die Druckleitung 6 in Druckspeichern zu Druckanstiegen. Dieser Druckanstieg kann wiederum zum Hochbringen der Druckwange 3 in den ZE-OT Punkt (Fig. 1) genutzt werden. Während der Abwärtsbewegung der Druckwange 3 und somit auch jeder Kolbenstange 8 und der Kolben vergrößert sich jeder Sperraum 9. Diese füllen sich über als Rückschlagventile ausgebildete Nachfüllventile 10 und die Leitung 13 aus dem Reservoir 12 auf. Die 2-Wegeventile 17 und 26 sind vermittels eingebauter Federn geschlossen, ebenso die Ventile 19. Mit dem Hochlaufen des Stößels ist das Werkstück auszuwerfen. Dieses kann direkt mit der Stößelhochlaufbewegung oder verzögert auf diese Bewegung erfolgen. Solange die 2-Wegeventile 26 und 17 geschlossen sind, verbleibt die Druckwange 3 in der unteren lage. Die Aufwärtsbewegung der Druckwange 3 unter dem Druck in den Druckspeichern und der leitung 6 erfolgt mit dem Öffnen zunächst der 2-Wegeventile 26. Hierzu ist es erforderlich, das Wegeventil 38 in dem Vorsteuerblock 31 aus der gezeigten Stellung in die zweite mögliche Stellung umzuschalten. Demzufolge wird der Steuerstromanschluß 33 des 2-Wegeventils 32 drucklos und es wird der Druck in den leitungen 37, 37′ über den Arbeitsanschluß 34 und den Arbeitsanschluß 35 auf die Ablaßleitung 20 geschaltet. Die 2-Wegeventile 26 öffnen und es fließt Hydrauliköl aus den Sperräumen 9 ab. Mit der nun einsetzenden Aufwärtsbewegung der Kolbenstangen 8 in den Ziehzylindern 4 können vermittels Nockensteuerung die Schalter 11 betätigt und somit Wegeventile 19 in der Parallelschaltung 16 geschaltet werden. Die schaltung dieser Wegeventile 19 aus der gezeigten in die mogliche Schaltstellung bewirkt das Öffnen der 2-Wegeventile 17 der Parallelschaltung 16 und somit einer Vergrößerung des Fließquerschnitts aus dum Sperraum 9 über die Ablaß leitung 20. Der Hochlauf der Druckwange 3 ist somit frei regelbar, insbesondere kann auf die in den einzelnen Ziehzylindern 4 diskret auf die Zieherfordernisse eingestellten Drücke eingegangen werden. Geringe Ziehkräfte erfordern größere Fließquerschnitte und umgekehrt.In the drawing phase, the ram and the upper part of the tool rest on the inserted sheet, the sheet metal holder and the lower part of the tool. The pressure cheek 3 is moved downwards with this movement, and a discretely adjustable pressure builds up in the pressure cylinders 4. This pressure leads to pressure increases in pressure accumulators via the pressure line 6. This pressure increase can in turn be used to bring the pressure cheek 3 up to the ZE-OT point (FIG. 1). During the downward movement of the pressure cheek 3 and thus also each piston rod 8 and the piston, each clearance space 9 increases. These fill up via refill valves 10 designed as check valves and the line 13 from the reservoir 12. The 2-way valves 17 and 26 are closed by means of built-in springs, as are the valves 19. When the ram starts up, the workpiece is ejected. This can take place directly with the tappet run-up movement or with a delay to this movement. As long as the 2-way valves 26 and 17 are closed, the pressure cheek 3 remains in the lower position. The upward movement of the pressure cheek 3 under the pressure in the pressure accumulators and the line 6 takes place when the 2-way valves 26 are opened. For this purpose, it is necessary to switch the directional valve 38 in the pilot control block 31 from the position shown to the second possible position. As a result, the control power connection 33 of the 2-way valve 32 is depressurized and the pressure in the lines 37, 37 'is switched via the working connection 34 and the working connection 35 to the drain line 20. The 2-way valves 26 open and hydraulic oil flows out of the restricted spaces 9. With the now upward movement of the piston rods 8 in the drawing cylinders 4, the switches 11 can be actuated by means of cam control and thus directional valves 19 can be switched in the parallel connection 16. The switching of these directional valves 19 from the shown in the possible switching position causes the opening of the 2-way valves 17 of the parallel circuit 16 and thus an increase in the flow cross section from the space 9 through the drain line 20. The run-up of the pressure cheek 3 is thus freely adjustable, in particular The pressures set discretely in the individual drawing cylinders 4 can be dealt with. Low pulling forces require larger flow cross sections and vice versa.

Bei Einleitung in die Dämpfungsphase werden über Schalter der Schaltergruppe 11 das Wegeventil 38 und nach Bedarf die Wegeventile 19 in die gezeigten Stellungen geschaltet. Die 2-Wegeventile 1 und 26 schließen. Das 2-Wege-Ventil 26 ist mit Dämpfungszapfen 25 versehen und bestimmt zusammen mit der Vorsteuereinheit 31 und der in dieser eingebauten, durch Blenden ausgebildeten Drossel 42 und dem Drosselrückschlagventil 36 einen stufenlosen, schwingungslos sich verzögernden Bremsvorgang in den Anschlag ZE-OT.When initiating the damping phase, the directional control valve 38 and, if required, the directional control valve 19 are switched to the positions shown via switches in the switch group 11. The 2-way valves 1 and 26 close. The 2-way valve 26 is provided with a damping pin 25 and, together with the pilot control unit 31 and the throttle 42 and throttle check valve 36 built therein, and the throttle check valve 36 determine a stepless, vibration-free decelerating braking operation into the stop ZE-OT.

Claims (3)

  1. Control circuit for the run-up of the pressure cheek (3) of a drawing apparatus after drawing in a drawing press or press having at least one drawing stage, with pressure cylinders (4) acting on the pressure cheek (3) and, via this, on plate-holders in the dye, for the plate-holder force during drawing, and with blocking cylinders (7) assigned to the pressure cylinders (4) and having pistons (8) and blocking spaces (9) which are each refilled from a reservoir (12) via a refilling valve (10) during the drawing operation, and with valves (17; 26) which precede each of the blocking spaces (9) and vary the flow cross-section out of each blocking space (9) during the run-up of the pressure cheek (3) and which can be activated in time, with the result that the pressure cheek (3) is raised on the one hand simultaneously with the ram run-up and on the other hand with a delay relative to the ram run-up, and by further variation of the flow cross-section a delayed stopping of the pressure cheek (3) at the upper holding point is achieved, characterized by an arrangement, connected to each of the blocking spaces (9), of at least two built-in two-way valves (17) in a parallel connection (16), each of the built-in two-way valves (17) being flow-connectable by means of a first control-flow connection (18) to the blocking space (9) of the blocking cylinder (7) via a directional valve (19) and being flow-connected by means of a first working connection (21) to the reservoir (12) and by means of a second working connection (22) to the same blocking space (9) of the blocking cylinder (7) directly, and by the arrangement of further built-in two-way valves (26) which can be connected to each parallel connection (16) and which are flow-connected by means of a first working connection (28) to the blocking space (9) of one of the blocking cylinders (7) and by means of a second working connection (27) to the reservoir (12) and the control-flow connections (30) of which are connected to a common pilot-control unit (31), the directional valves (19) in the lines (23) to the first control-flow connections (18) and a directional valve (38) assigned to the pilot-control unit (31) being capable of being controlled independently of one another in time in dependence on the ram run-up.
  2. Control circuit according to Claim 1, characterized in that the pilot-control unit (31) has a built-in two-way valve (32), the control-flow connection (33) of which can be flow-connected via the directional valve (38) to the blocking space (9) of one of the blocking cylinders (7), of which one working connection (35) is connected to the reservoir (12) and the other working connection (34) is connected via a non-return throttle valve (36) to the control-flow connections (30) of each of the built-in two-way valves (26), there being introduced between the pressure-line (39) coming from the blocking space (9) and the control line (37, 37'), leading from one working connection (34) of the built-in two-way valve (32) to the control-flow connections (30) of the built-in two-way valves (26), upstream of the non-return throttle valve (36), a connecting line (40) which has a non-return valve (41) blocking in the direction of the blocking space (9) and which has a throttle (42).
  3. Control circuit according to Claim 1 or 2, characterized in that the built-in two-way valves (26) activated by the control unit (31) are such as have damping pins (25).
EP90112668A 1989-07-06 1990-07-03 Control switch connection for the upward stroke of the pressure cheek of a deep drawing device Expired - Lifetime EP0406792B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3922212 1980-06-13
DE3922212A DE3922212A1 (en) 1989-07-06 1989-07-06 CONTROL CIRCUIT FOR THE RUNNING UP OF THE PRESSURE STRING OF A DRAWER

Publications (2)

Publication Number Publication Date
EP0406792A1 EP0406792A1 (en) 1991-01-09
EP0406792B1 true EP0406792B1 (en) 1994-04-27

Family

ID=6384416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90112668A Expired - Lifetime EP0406792B1 (en) 1989-07-06 1990-07-03 Control switch connection for the upward stroke of the pressure cheek of a deep drawing device

Country Status (3)

Country Link
EP (1) EP0406792B1 (en)
DE (2) DE3922212A1 (en)
ES (1) ES2053020T3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4129367A1 (en) * 1991-09-04 1993-03-11 Schuler Gmbh L CIRCUIT FOR CONTROLLING THE SPEED OF A PRINTING CYLINDER
DE4218914A1 (en) * 1992-06-10 1993-12-16 Erfurt Umformtechnik Gmbh Hydraulic pulling device in a press
ITPD20050138A1 (en) 2005-05-17 2006-11-18 Special Springs Srl EQUIPMENT FOR LOCKING A SHEET OF SHEET TO BE SHAPED IN A PRESS
DE102019119392A1 (en) * 2019-07-17 2021-01-21 Moog Gmbh Device and method for controlling or regulating a movement of a drawing cushion of a drawing cushion press

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD227058A1 (en) * 1984-10-08 1985-09-11 Warnke Umformtech Veb K ARRANGEMENT FOR RULES FOR CONTROLLABLE PNEUMATIC CUSHIONS
DE3640788A1 (en) * 1986-11-28 1988-06-01 Schuler Gmbh L DRAWING DEVICE FOR A PRESS
DE3718159A1 (en) * 1987-05-29 1988-12-15 Schuler Gmbh L Drawing apparatus on presses
DE3735582C1 (en) * 1987-10-21 1988-04-28 Daimler Benz Ag Double-acting press for pulling sheet metal parts

Also Published As

Publication number Publication date
EP0406792A1 (en) 1991-01-09
DE3922212A1 (en) 1991-01-17
DE59005507D1 (en) 1994-06-01
ES2053020T3 (en) 1994-07-16

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