EP0406792A1 - 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
EP0406792A1
EP0406792A1 EP90112668A EP90112668A EP0406792A1 EP 0406792 A1 EP0406792 A1 EP 0406792A1 EP 90112668 A EP90112668 A EP 90112668A EP 90112668 A EP90112668 A EP 90112668A EP 0406792 A1 EP0406792 A1 EP 0406792A1
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EP
European Patent Office
Prior art keywords
valves
pressure
valve
control
working connection
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Granted
Application number
EP90112668A
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German (de)
French (fr)
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EP0406792B1 (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.
  • 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 ramp control provides for the pressure cheek either to 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 ramping movement of the pressure cheek is steamed before reaching the raised position. H. in a delayed motion.
  • DE 35 21 698 A1 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 is curve-guided in the individual movement phases in DE 35 05 984 A1.
  • 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 startup according to the invention comes, for. B. in such drawing apparatus for use in which the drawing pressure - sheet metal holder force - is to be set in the individual pressure points on the drawing conditions.
  • 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 various 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 time of the start of the ramp-up can e.g. be determined by means of electrical / electronic switching means and cause the opening of a valve or the 2-way valves (Fig. 2 + 3).
  • the indicated vaporization phase is indicated by Reduction in cross-section in the outlet from the restricted spaces 9 to the reservoir 12, thus by closing the valves 26 and the valves 17 of the parallel connection 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 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.
  • 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 travel-adjustable switches 11 at the lower end region.
  • the parallel circuit 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 to the blocking space 9 of the blocking cylinder 7 via switchable directional valves 19.
  • 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 fluidly 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 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 in the direction of blocking space 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 17 and 26 close.
  • the 2-way valve 26 is provided with damping pins 25 and, in the best way, with the pilot control unit 31 and the orifices 42 and throttle check valve 36 incorporated therein, a stepless, vibration-free decelerating braking process into the stop ZE-OT.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Soil Working Implements (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Abstract

The control circuit for the upwards stroke of the pressure cheek of a deep drawing device (1) provides a parallel circuit (16) of at least two two-way cartridge valves (17) for the blocking spaces of the upward motion. These cartridge valves can be switched via directional control valves as a function of the punch travel. Connected in parallel with these circuits there is in the case of each blocking space a further two-way valve (26), which can be controlled overall via a pilot control unit (31) for the initiation and adjustment of the upward stroke phase of the pressure cheek. <IMAGE>

Description

Die Erfindung betrifft eine Regelschaltung nach dem Oberbegriff des Anspruchs 1.The invention relates to a control circuit according to the preamble of claim 1.

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 ramp control provides for the pressure cheek either to 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 ramping 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 35 21 698 A1 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 35 21 698 A1 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 35 05 984 A1 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 is curve-guided in the individual movement phases in DE 35 05 984 A1. 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 startup according to the invention comes, for. B. in such drawing apparatus for use in which the drawing pressure - sheet metal holder force - is to be set in the individual pressure points on the drawing conditions. 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. The various drawing pressures of sheet metal parts to be shaped differently must be taken into account.

Die Aufgabe ist gelöst durch die den Anspruch 1 kennzeichnenden Merkmale. Die Ansprüche 2 und 3 stellen bevorzugte Ausgestaltungen der Erfindung dar.The object is achieved 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:
  • 1 is a movement diagram of the plunger and pressure cheek,
  • Fig. 2 is a control engineering simplified representation of the entire structure of the control circuit and
  • Fig. 3 shows 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 (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 time of the start of the ramp-up can e.g. be determined by means of electrical / electronic switching means and cause the opening of a valve or the 2-way valves (Fig. 2 + 3). The indicated vaporization phase is indicated by Reduction in cross-section in the outlet from the restricted spaces 9 to the reservoir 12, thus by closing the valves 26 and the valves 17 of the parallel connection 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.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 travel-adjustable switches 11 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 circuit 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 to the blocking space 9 of the blocking cylinder 7 via switchable directional valves 19. 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 fluidly 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 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 in the direction of blocking space 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 Rückschlag­ventile 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 Steuer­ stromanschluß 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 raise the pressure cheek 3 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 check valves 10 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 tax 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 17 und 26 schließen. Das 2-Wege-Ventil 26 ist mit Dämpfungszapfen 25 verse­hen und bestmmit zum mit der Vorsteuereinheit 31 und den in die­ser eingebauten Blenden 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 17 and 26 close. The 2-way valve 26 is provided with damping pins 25 and, in the best way, with the pilot control unit 31 and the orifices 42 and throttle check valve 36 incorporated therein, a stepless, vibration-free decelerating braking process into the stop ZE-OT.

Claims (3)

1. Regelschaltung für den Hochlauf der Druckwange eines Ziehappa­rats nach dem Ziehen in einer Ziehpresse oder Presse mit zumindest ei­ner Ziehstufe, mit auf die ruckwange und über diese auf Blechhalter im Werkzeug wirkenden Druckzylindern für die Blechhalterkraft beim Ziehen und mit Sperrzylindern mit Kolben und Sperräumen, die über ein Nachfüllventil während des Ziehvorgangs aus eine Reservoir nachge­füllt werden, und mit jede der Sperräume vorgeschalteten, den Fließ­querschnitt aus jede Sperraum während des Hochlaufs der Druckwange verändernden Ventilen, die zeitlich ansteuerbar sind, wodurch die Druckwange zum einen zugleich mit dum Stößelhochlauf, zum anderen ver­zögert zu dem Stößelhochlauf angehoben wird und durch weiteres Verän­dern des Fließquerschnitts ein verzögertes Anhalten der Druckwange im oberen Haltepunkt erreicht wird, gekennzeichnet durch eine je­dem der Sperräume (9) zugeschaltete Anordnung von zumindest zwei 2-Wege-Einbauventilen (17) in einer Parallelschaltung (16), wobei je­des der 2-Wege-Einbauventile (17) mit dem Steuerstromanschluß (18) über ein Wegeventil (19) mit dem Sperraum (9) des Sperrzylinders (7) fließverbindbar ist und mit eine ersten Arbeitsanschluß (21) mit ei­nem Reservoir (12) und mit eine zweiten Arbeitsanschluß (22) mit dem gleichen Sperraum (9) des Sperrzylinders (7) direkt fließverbunden ist, und durch die Anordnung weiterer jeder Parallelschaltung (16) zu­schaltbarer 2-Wege-Einbauventile (26), die mit eine ersten Arbeitsan­schluß (28) an den Sperraum (9) eines der Sperrzylinder (7) und mit eine zweiten Arbeitsanschluß (27) mit dem Reservoir (12) fließverbun­den sind und deren Steuerstromanschlüsse (30) an eine gemeinsame Vor­steuereinheit (31) angeschlossen sind, und die Wegeventile (19) in den leitungen (23) zu den Steuerstromanschlüssen (18) und ein Wegeven­til (38) der Vorsteuereinheit (31) in Abhängigkeit von dem Stößelhoch­lauf zeitlich unabhängig voneinander steuerbar sind.1.Control circuit for the run-up of the pressure cheek of a drawing apparatus after pulling in a drawing press or press with at least one drawing stage, with pressure cylinders acting on the rear cheek and via this on sheet metal holders in the tool for the sheet metal holder force when pulling and with locking cylinders with pistons and blocking spaces be refilled from a reservoir via a refill valve during the drawing process, and valves connected upstream with each of the barriers, the flow cross-section from each barrier space during the run-up of the pressure cheek, which can be controlled in time, whereby the pressure cheek is delayed on the one hand with the ram run-up and on the other is raised to the ram run-up and by further changing the flow cross-section a delayed stopping of the pressure cheek in the upper stopping point is achieved, characterized by an arrangement of at least two 2-way built-in valves (17) connected in parallel to each of the restricted spaces (9) Oil circuit (16), each of the 2-way cartridge valves (17) with the control current connection (18) via a directional valve (19) with the locking space (9) of the locking cylinder (7) is flow-connectable and with a first working connection (21) a reservoir (12) and with a second working connection (22) with the same locking space (9) of the locking cylinder (7) is directly fluid-connected, and through the arrangement of further each parallel connection (16) switchable 2-way built-in valves (26) which with a first working connection (28) to the blocking space (9) of one of the locking cylinders (7) and with a second working connection (27) with the reservoir (12) and their control current connections (30) are connected to a common pilot control unit (31) , and the directional control valves (19) in the lines (23) to the control current connections (18) and a directional control valve (38) of the pilot control unit (31) can be controlled independently of one another as a function of the tappet run-up. 2. Regelschaltung nach Anspruch 1, dadurch gekennzeichnet, daß die Vorsteuereinheit (31) ein 2-Wege-Einbauventil (32) auf­weist, dessen Steuerstromanschluß (33) über das Wegeventil (38) mit dem Sperraum (9) eines der Sperrzylinder (7) fließverbindbar ist, des­sen einer Arbeitsanschluß (35) mit dem Reservoir (12) und dessen ande­ rer Arbeitsanschluß (34) über ein Drossel-Rückschlagventil (36) an die Steuerstromanschlüsse (30) jedes der 2-Wege-Einbauventile (26) ge­schaltet ist und wobei zwischen der von dem Sperraum (9) kommenden Druckleitung (39) und der von dem einen Arbeitsanschluß (34) des 2-Wege-Einbauventils (32) zu den Steuerstromanschlüssen (30) der 2-Wege-Einbauventile (26) führenden Steuerleitung (37, 37′) vor dem Drossel-Rückschlagventil (36) eine Verbindungsleitung (40) einge­bracht ist mit eine Rückschlagventil (41) in Richtung Sperraum (9) sperrend und mit eine Fließwiderstand (Drossel 42).2. Control circuit according to claim 1, characterized in that the pilot unit (31) has a 2-way cartridge valve (32), the control current connection (33) via the directional valve (38) with the blocking space (9) one of the locking cylinders (7) is flow-connectable, one of which has a working connection (35) to the reservoir (12) and the other rer working connection (34) via a throttle check valve (36) to the control current connections (30) of each of the 2-way cartridge valves (26) is connected, and between the pressure line (39) coming from the space (9) and that of the a working connection (34) of the 2-way cartridge valve (32) to the control current connections (30) of the 2-way cartridge valves (26) leading control line (37, 37 ') before the throttle check valve (36) a connecting line (40) is introduced with a check valve (41) in the direction of the blocking space (9) and with a flow resistance (throttle 42). 3. Regelschaltung nach Anspruch 1 oder 2, dadurch gekennzeich­net, daß die von der Steuereinheit (31) angesteuerten 2-Wege-Einbauventile (26) solche mit Dämpfungszapfen (25) sind.3. Control circuit according to claim 1 or 2, characterized in that the controlled by the control unit (31) 2-way cartridge valves (26) are those with damping pin (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 true EP0406792A1 (en) 1991-01-09
EP0406792B1 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0530739A1 (en) * 1991-09-04 1993-03-10 SCHULER PRESSEN GmbH &amp; Co. Control circuit for the control of the speed of a pressure cylinder
EP0573830A1 (en) * 1992-06-10 1993-12-15 Umformtechnik ERFURT GmbH Hydraulic drawing system in a press
EP1724034A1 (en) * 2005-05-17 2006-11-22 Special Springs S.r.l. Apparatus for locking a sheet of metal suitable to be shaped in a press

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (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
EP0268893A2 (en) * 1986-11-28 1988-06-01 L. SCHULER GmbH Drawing device for a press
DE3718159A1 (en) * 1987-05-29 1988-12-15 Schuler Gmbh L Drawing apparatus on presses
EP0312809A2 (en) * 1987-10-21 1989-04-26 Daimler-Benz Aktiengesellschaft Double action press for drawing sheet components

Patent Citations (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
EP0268893A2 (en) * 1986-11-28 1988-06-01 L. SCHULER GmbH Drawing device for a press
DE3718159A1 (en) * 1987-05-29 1988-12-15 Schuler Gmbh L Drawing apparatus on presses
EP0312809A2 (en) * 1987-10-21 1989-04-26 Daimler-Benz Aktiengesellschaft Double action press for drawing sheet components

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0530739A1 (en) * 1991-09-04 1993-03-10 SCHULER PRESSEN GmbH &amp; Co. Control circuit for the control of the speed of a pressure cylinder
EP0573830A1 (en) * 1992-06-10 1993-12-15 Umformtechnik ERFURT GmbH Hydraulic drawing system in a press
EP1724034A1 (en) * 2005-05-17 2006-11-22 Special Springs S.r.l. Apparatus for locking a sheet of metal suitable to be shaped in a press
US7260971B2 (en) 2005-05-17 2007-08-28 Special Springs S.R.L. Apparatus for locking a sheet of metal suitable to be shaped in a press

Also Published As

Publication number Publication date
ES2053020T3 (en) 1994-07-16
EP0406792B1 (en) 1994-04-27
DE3922212A1 (en) 1991-01-17
DE59005507D1 (en) 1994-06-01

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