EP0510507B1 - Drawing device in the table of a press - Google Patents

Drawing device in the table of a press Download PDF

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Publication number
EP0510507B1
EP0510507B1 EP92106511A EP92106511A EP0510507B1 EP 0510507 B1 EP0510507 B1 EP 0510507B1 EP 92106511 A EP92106511 A EP 92106511A EP 92106511 A EP92106511 A EP 92106511A EP 0510507 B1 EP0510507 B1 EP 0510507B1
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EP
European Patent Office
Prior art keywords
pressure
cylinders
cheek
press
pins
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92106511A
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German (de)
French (fr)
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EP0510507A1 (en
Inventor
Siegfried Baur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
L Schuler GmbH
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L Schuler GmbH
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Publication of EP0510507A1 publication Critical patent/EP0510507A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04Blank holders; Mounting means therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04Blank holders; Mounting means therefor
    • B21D24/08Pneumatically or hydraulically loaded blank holders

Definitions

  • the invention relates to a pulling device according to the preamble of claim 1.
  • DE-A-32 02 134 describes a pulling device for a press which has a pressure cheek that can be raised and lowered in the press table.
  • the pressure cheek is located below a platen for the lower part of the tool and is supported in a table-mounted pressure cylinder.
  • a number of pressure cylinders can be moved in height with the pressure cheek and act on ejector pins in the lower part of the tool via a pin plate.
  • the pressure cheek is lowered due to the tappet force during the pulling process via the pin plate and the ejector pins.
  • the pistons of the pressure cylinders are subjected to a slight pressure, which is the same for all pressure cylinders, in the sense of an ejection movement for the molded part, while the pressure cheek is still held in the lower position.
  • the pressure cheek retracts with a delay to act on the pin plate at the beginning of the next drawing process.
  • a drawing device in a press is known from EP-A-0 173 755, in which the sheet metal holder pressure is to be adapted in the various pressure areas for the drawing part.
  • This is served by a Number of pressure cylinders permanently installed in the press table, the piston rods of which can be moved in height by means of a pressure cheek acting jointly on all piston rods.
  • the piston rods acting at the other end on the sheet metal holder can be lowered under the plunger movement against the pressure which can be controlled differently via valves in the pressure chambers.
  • DE-A-37 17 768 describes a pulling device in the press table of a press in which the sheet metal parts are to be pulled and ejected either by means of a sheet holder or by means of a drawing die. This requires a change in the operating mode.
  • a pressure cheek is acted upon by drawing cylinders via a slide that can be raised and lowered.
  • push rods are fixedly mounted in the extension of the piston rods in the slide of the drawing cylinder.
  • the pressure rods are led out through the pressure cheek to rest on the sheet metal holder.
  • Mechanical couplings are arranged between the pressure cheek and each of the pressure rods and the pressure cheek and the extended piston rod of the ejector apparatus for selectively uncoupling or coupling the pulling device and ejector apparatus from or to the pressure cheek.
  • drawing devices are equal to a number of pressure pins that only become active together or act on a sheet metal holder when they are actuated by drawing cylinders.
  • the number of drawing cylinders is less than the number of pressure bolts, but without being able to make a selection of pressure bolts to be loaded.
  • An essential advantage of the invention is that the pressure cylinder in the pressure cheek is influenced by selective actuation, loading or non-loading both on the sheet metal holding process during drawing and on the ejection process. While according to claim 1 with a smaller number of drawing cylinders each with higher individual drawing force can be used using the selective selection of pressure pins, according to claim 2 the individual drawing force and thus the dimensioning of each of the drawing cylinders is to be set lower. According to a further embodiment, not only a reduction in the total line cross section to the valves is achieved; by reducing the distances between the respective pressure chamber of a pressure cylinder and the associated switching valve, the elasticity of the circuit structure is also significantly reduced.
  • Figs. 1, 2 and 4, 5 are positioned with 1 press stand of a press, with 7 a press table and with 8 the drawing apparatus for the shaping and ejection of the sheet metal parts 30.
  • a sliding table 2 which can be moved into the press has pressure pins 6 which can be moved in receiving holes in the sliding table.
  • a tool consisting of upper tool part 3 and lower tool part 4 for a sheet metal part or a set of tools for the simultaneous forming of several sheet metal parts is placed on the sliding table.
  • the lower tool part includes a sheet metal holder 5 for holding the outer and inner edge regions of the sheet metal parts when the ram of the press and then attached to this upper part of the tool.
  • the sheet metal holder can be acted upon by the pressure pins 6.
  • the drawing apparatus has, via a cross member 25, which is held on press stand sheets, drawing cylinders 20 and 21 mounted in a press-tight manner, of which the drawing cylinders 20 are arranged higher than the drawing cylinders 21 for reasons of space.
  • the drawing cylinders can be controlled via valves 23 from a pressure supply 27, as has been described in EP 0 173 755 B1.
  • the drawing cylinders 21 act indirectly via the cylinder's own piston rods and pressure bolts 24, the drawing cylinders 20 directly on a pressure cheek 9 which can be raised and lowered in the press table in areas in which pressure cylinders 10, 12 with the piston rods 11, 13 are attached.
  • These pressure cylinders can be controlled via valves 16 from a pressure line 18, 19.
  • a valve is connected to each pressure cylinder, the valves 16 and the pressure lines 18 are likewise fastened to the pressure cheek 9 and only the line part marked 19 is to be designed as a movable line and is connected for this purpose via a connection block 17.
  • the pressure cylinders can be individually controlled by optionally controlling the valves.
  • a piston rod 11 moved out of the pressure cylinder by pressurizing the underside of the associated piston acts in the case of actuation of the pressure cylinders 10 (indirectly) via pressure bolts 15 on pressure pins 6 in the sliding table, in the case of activation of pressure cylinders 12 via the piston rods 13 directly on pressure pins 6 in Sliding table.
  • This type of discrete control of the pressure cylinders 10, 12 in the pressure cheek 9 can take into account the drawing conditions of sheet metal parts 30 of different types, as can be seen in FIG. 3, and also those with more or less large recesses during the forming.
  • the press table 7 has a perforated plate 14 with corresponding openings.
  • the figures 1 and 2 show the time e.g. of setting up the press, the upper tool part 3 still being attached to the press ram. There are no drawing cylinders 20, 21 pressurized. The freedom of movement of the pressure cheek 9 can be changed by means of the setting of the stop device 29. The stop device is fastened to the pressure cheek 9 via spacer bolts 28.
  • Fig. 3 only the top of the sliding table 2 is illustrated, which is located on the press table 7 indicated here and has a hole pattern for the passage and the storage of pressure pins 6.
  • 30 sheet metal parts of different shapes are exemplified to indicate the meaning of the different Highlighting of pressure pins 6 by means of the previously mentioned means of the drawing device.
  • Figs. 4 and 5 the upper tool part 3 is shown lifted from the lower tool part 4 by a ram of the press.
  • drawing cylinders 21 To hold the inserted sheet or sheet metal part 30, only external drawing cylinders 21 have been applied.
  • the raised pressure cheek 9 has lifted off the piston rods of the pressure cylinders 20 located on the inside.
  • pressure cylinders 10 are accordingly also pressurized via the valves 16, the piston rods 15 of which are extended and are in operative engagement with the pressure pins 6 located above them.
  • the sheet metal holder 5 is thus only acted upon by the units mentioned.
  • the drawing pressure and the required movements which are essentially lowering movements of the pressure cheek 9 and initially with the decline of the tappet, are applied by the drawing cylinders located below, here for example 21. It goes without saying that further drawing cylinders or generally other drawing cylinders can be actuated and act on the pressure cheek 9.
  • the selection of the pressure pins 6 in order to act upon the, possibly a plurality of, sheet metal holders 5 takes place via the controlled pressure cylinders 10, 12 in the pressure cheek.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Description

Die Erfindung betrifft eine Zieheinrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a pulling device according to the preamble of claim 1.

Um Ziehteile in einer Presse zu formen ist es notwendig, das in das Werkzeug eingelegte Blech oder Vorformteil zu halten und der während des Niedergangs des Stößels bewirkten Kraft eine Gegenkraft (Ziehkraft) über ein nachgebbares Polster entgegenwirken zu lassen. Das Blechteil wird während des Ziehvorgangs zwischen einem Blechhalter im Werkzeugunterteil und einer Gegenanlage im Werkzeugoberteil gehalten.In order to form drawn parts in a press, it is necessary to hold the sheet or preform part inserted in the tool and to counteract the force caused during the ram's decline by a counterforce (pulling force) via a flexible cushion. The sheet metal part is held between a sheet metal holder in the lower tool part and a counter-device in the upper tool part during the drawing process.

In der DE-A-32 02 134 ist eine Zieheinrichtung für eine Presse beschrieben worden, die eine in dem Pressentisch anhebbare und absenkbare Druckwange aufweist. Die Druckwange befindet sich unterhalb einer Aufspannplatte für das Werkzeugunterteil und ist in einem tischfesten Druckzylinder abgestützt. Mit der Druckwange sind eine Anzahl Druckzylinder höhenmäßig verfahrbar, die über eine Stiftplatte auf Auswerferstifte im Werkzeugunterteil wirken. Die Druckwange wird infolge der Stößelkraft während des Ziehvorgangs über die Stiftplatte und die Auswerferstifte abgesenkt. Nach dem Ziehvorgang werden die Kolben der Druckzylinder im Sinne einer Auswerfbewegung für das geformte Teil mit geringem, für alle Druckzylinder gleichem Druck beaufschlagt, während die Druckwange in der unteren Position noch gehalten ist. Die Druckwange fährt verzögert nach, um zu Beginn des nächsten Ziehvorgangs auf die Stiftplatte zu wirken.DE-A-32 02 134 describes a pulling device for a press which has a pressure cheek that can be raised and lowered in the press table. The pressure cheek is located below a platen for the lower part of the tool and is supported in a table-mounted pressure cylinder. A number of pressure cylinders can be moved in height with the pressure cheek and act on ejector pins in the lower part of the tool via a pin plate. The pressure cheek is lowered due to the tappet force during the pulling process via the pin plate and the ejector pins. After the drawing process, the pistons of the pressure cylinders are subjected to a slight pressure, which is the same for all pressure cylinders, in the sense of an ejection movement for the molded part, while the pressure cheek is still held in the lower position. The pressure cheek retracts with a delay to act on the pin plate at the beginning of the next drawing process.

Weiterhin ist aus der EP-A-0 173 755 eine Zieheinrichtung in einer Presse bekannt, bei der der Blechhalterdruck in den verschiedenen Andruckbereichen für das Ziehteil anzupassen ist. Hierzu dient eine Anzahl fest in dem Pressentisch installierter Druckzylinder, deren Kolbenstangen über eine auf alle Kolbenstangen gemeinsam wirkende Druckwange höhenmäßig verfahrbar sind. Die anderenends auf den Blechhalter wirkenden Kolbenstangen sind unter der Stößelbewegung gegen den über Ventile in den Druckkammern unterschiedlich steuerbaren Druck absenkbar.Furthermore, a drawing device in a press is known from EP-A-0 173 755, in which the sheet metal holder pressure is to be adapted in the various pressure areas for the drawing part. This is served by a Number of pressure cylinders permanently installed in the press table, the piston rods of which can be moved in height by means of a pressure cheek acting jointly on all piston rods. The piston rods acting at the other end on the sheet metal holder can be lowered under the plunger movement against the pressure which can be controlled differently via valves in the pressure chambers.

In der DE-A-37 17 768 ist eine Zieheinrichtung im Pressentisch einer Presse beschrieben worden, bei der das Ziehen und das Auswerfen der Blechteile entweder mittels Blechhalter oder mittels Ziehmatrize erfolgen soll. Hierzu ist eine Umschaltung der Betriebsart erforderlich. In der Zieheinrichtung wird eine Druckwange von Ziehzylindern über einen heb- und senkbaren Schlitten beaufschlagt. Hierfür sind in dem Schlitten Druckstangen in der Verlängerung der Kolbenstangen der Ziehzylinder fest gelagert. Die Druckstangen sind durch die Druckwange zur Anlage an dem Blechhalter herausgeführt. Zwischen der Druckwange und jeder der Druckstangen und der Druckwange und der verlängerten Kolbenstange des Auswerferapparats sind mechanische Kupplungen angeordnet zum wahlweisen Ab- bzw. Ankuppeln von Zieheinrichtung und Auswerferapparat von der Druckwange bzw. an diese.DE-A-37 17 768 describes a pulling device in the press table of a press in which the sheet metal parts are to be pulled and ejected either by means of a sheet holder or by means of a drawing die. This requires a change in the operating mode. In the drawing device, a pressure cheek is acted upon by drawing cylinders via a slide that can be raised and lowered. For this purpose, push rods are fixedly mounted in the extension of the piston rods in the slide of the drawing cylinder. The pressure rods are led out through the pressure cheek to rest on the sheet metal holder. Mechanical couplings are arranged between the pressure cheek and each of the pressure rods and the pressure cheek and the extended piston rod of the ejector apparatus for selectively uncoupling or coupling the pulling device and ejector apparatus from or to the pressure cheek.

Diesen vorbekannten Zieheinrichtungen ist gleich eine Anzahl an Druckstiften, die nur gemeinsam aktiv werden bzw. über Ziehzylinder beaufschlagt auf einen Blechhalter wirken. Die Anzahl der Ziehzylinder ist geringer als die Anzahl der Druckbolzen, ohne jedoch eine Auswahl an zu beaufschlagenden Druckbolzen vornehmen zu können.These previously known drawing devices are equal to a number of pressure pins that only become active together or act on a sheet metal holder when they are actuated by drawing cylinders. The number of drawing cylinders is less than the number of pressure bolts, but without being able to make a selection of pressure bolts to be loaded.

Demgegenüber ist es Aufgabe der Erfindung, einerseits die auf den Blechhalter wirkenden Druckstifte auszuwählen, um hierdurch der Größe eines Blechteils, dessen Form und der Freiformen gerecht zu werden und auch beispielsweise spiegelgleiche Blechteile zu halten, andererseits kann durch Auswahl bestimmter Druckstifte und entsprechend weniger angesteuerter Ziehzylinder auch der Auswerfervorgang mit verringerter Energie erfolgen, während die zunächst während des Auswerfervorgangs nicht angesteuerten Ziehzylinder in einer späteren Phase angesteuert werden.In contrast, it is an object of the invention, on the one hand, to select the pressure pins acting on the sheet metal holder, in order thereby to do justice to the size of a sheet metal part, its shape and free-form shapes and also, for example, to hold mirror-like sheet metal parts, and on the other hand, by selecting certain pressure pins and correspondingly less actuated drawing cylinders the ejector process also takes place with reduced energy, while the drawing cylinders which were initially not activated during the ejector process are activated in a later phase.

Diese Aufgabe ist gelöst durch die gegenständlichen Merkmale des Anspruchs 1. Die Merkmale der weiteren Ansprüche stellen vorteilhafte Ausgestaltungen der Erfindung dar.This object is achieved by the objective features of claim 1. The features of the further claims represent advantageous embodiments of the invention.

Von wesentlichem Vorteil der Erfindung ist dabei, daß durch selektive Ansteuerung, Beaufschlagung bzw. Nichtbeaufschlagung der Druckzylinder in der Druckwange Einfluß genommen wird sowohl auf den Blechhaltevorgang während des Ziehens als auch auf den Auswerfervorgang. Während gemäß Anspruch 1 mit einer geringeren Anzahl an Ziehzylindern bei jeweils höherer Einzel-Ziehkraft gezogen werden kann unter Nutzung der selektiven Anwahl an Druckstiften, ist gemäß Anspruch 2 die Einzel-Ziehkraft und somit die Dimensionierung jedes der Ziehzylinder geringer anzusetzen. Gemäß weiterer Ausgestaltung wird nicht nur eine Verringerung des Gesamt-Leitungsquerschnitts zu den Ventilen erreicht; durch die Verringerung der Abstände zwischen dem jeweiligen Druckraum eines Druckzylinders und dem zugehörenden Schaltventil verringern sich wesentlich auch die Elastizitäten des Schaltungsaufbaues.An essential advantage of the invention is that the pressure cylinder in the pressure cheek is influenced by selective actuation, loading or non-loading both on the sheet metal holding process during drawing and on the ejection process. While according to claim 1 with a smaller number of drawing cylinders each with higher individual drawing force can be used using the selective selection of pressure pins, according to claim 2 the individual drawing force and thus the dimensioning of each of the drawing cylinders is to be set lower. According to a further embodiment, not only a reduction in the total line cross section to the valves is achieved; by reducing the distances between the respective pressure chamber of a pressure cylinder and the associated switching valve, the elasticity of the circuit structure is also significantly reduced.

Anhand einer beispielhaften Ausführungsform in der Zeichnung soll die Erfindung im folgenden beschrieben werden.
Dabei zeigen:

Fig. 1
den Bereich einer Presse mit einem Ziehapparat in einer teilweisen Schnittdarstellung,
Fig. 2
eine Seitenansicht zu Fig. 1 in einer Teil-Schnittdarstellung,
Fig. 3
eine Draufsicht auf den Schiebetisch,
Fig. 4
eine Darstellung entsprechend Fig. 1 mit einigen aktivierten Druckzylindern in der Druckwange und
Fig. 5
eine der Fig. 4 entsprechende Seitenansicht.
The invention will be described below using an exemplary embodiment in the drawing.
Show:
Fig. 1
the area of a press with a drawing device in a partial sectional view,
Fig. 2
2 shows a side view of FIG. 1 in a partial sectional view,
Fig. 3
a plan view of the sliding table,
Fig. 4
a representation corresponding to FIG. 1 with some activated pressure cylinders in the pressure cheek and
Fig. 5
a side view corresponding to FIG. 4.

In den Fign. 1,2 und 4,5 sind mit 1 Pressenständer einer Presse, mit 7 ein Pressentisch und mit 8 der Ziehapparat für die Umformung und den Auswurf der Blechteile 30 positioniert. Ein in die Presse verfahrbarer Schiebetisch 2 weist Druckstifte 6 auf, die in Aufnahmelöchern in dem Schiebetisch beweglich sind. Auf den Schiebetisch ist ein Werkzeug aus Werkzeugoberteil 3 und Werkzeugunterteil 4 für ein Blechteil bzw. ein Satz an Werkzeugen für die gleichzeitige Umformung mehrerer Blechteile aufgesetzt. Das Werkzeugunterteil beinhaltet neben einer Patrize oder Patrizenteilen, die auch Matrizenteile sein können, einen Blechhalter 5 zum Halten der Außen- und Innenrandbereiche der Blechteile bei dem Niedergang des Stößels der Presse und des dann an diesem befestigten Werkzeugoberteils. Der Blechhalter ist von den Druckstiften 6 beaufschlagbar. Zum Aufbringen der Ziehkräfte und Blechhalterkräfte und der hierfür erforderlichen Bewegungen weist der Ziehapparat über eine Traverse 25, die an Pressenständerblechen gehalten ist, pressenfest montierte Ziehzylinder 20 und 21 auf, von denen die Ziehzylinder 20 aus Raumgründen höher als die Ziehzylinder 21 angeordnet sind. Die Ziehzylinder sind über Ventile 23 aus einer Druckversorgung 27 ansteuerbar, wie es in der EP 0 173 755 B1 beschrieben worden ist. Die Ziehzylinder 21 wirken über die zylindereigenen Kolbenstangen und Druckbolzen 24 indirekt, die Ziehzylinder 20 direkt auf eine in dem Pressentisch heb- und senkbar angeordneten Druckwange 9 in Bereichen, in denen Druckzylinder 10, 12 mit den Kolbenstangen 11, 13 angebracht sind. Diese Druckzylinder sind über Ventile 16 aus einer Druckleitung 18, 19 ansteuerbar. Jedem Druckzylinder ist ein Ventil zugeschaltet, wobei die Ventile 16 und die Druckleitungen 18 gleichfalls an der Druckwange 9 befestigt sind und nur der mit 19 gekennzeichnete Leitungsteil als bewegliche Leitung auszuführen und hierfür über einen Anschlußblock 17 angeschlossen ist. Die Druckzylinder sind durch wahlweise Ansteuerung der Ventile entsprechend einzeln ansteuerbar. Eine aus dem Druckzylinder durch Druckbeaufschlagung der Unterseite des zugehörenden Kolbens herausbewegte Kolbenstange 11 wirkt im Fall einer Ansteuerung der Druckzylinder 10 (indirekt) über Druckbolzen 15 auf Druckstifte 6 im Schiebetisch, im Fall einer Ansteuerung von Druckzylindern 12 über die Kolbenstangen 13 direkt auf Druckstifte 6 im Schiebetisch. Durch diese Art diskreter Ansteuerung der Druckzylinder 10, 12 in der Druckwange 9 kann den Ziehverhältnissen von Blechteilen 30 unterschiedlicher Art, wie sie aus Fig. 3 erkennbar sind, und auch solchen mit mehr oder weniger großen Ausnehmungen während der Umformung Rechnung getragen werden. Für die bewegliche Lagerung der Druckbolzen 15 und die Durchführung der Kolbenstangen 13 zum Eingriff mit Druckstiften 6 weist der Pressentisch 7 eine Lochplatte 14 mit entsprechenden Durchbrüchen auf. Für die diskrete Ansteuerung der Ziehzylinder 20, 21 ist ein Abheben der Druckwange 9 von den Kolbenstangen der Ziehzylinder erforderlich. Hierfür sind zwischen den Kolbenstangen der Ziehzylinder 21 und den Druckbolzen 24 und zwischen den Kolbenstangen der Ziehzylinder 20 und der Druckwange 9 voneinander entkuppelbare Elemente, z.B. Kugelpfannen 22 vorzusehen.In Figs. 1, 2 and 4, 5 are positioned with 1 press stand of a press, with 7 a press table and with 8 the drawing apparatus for the shaping and ejection of the sheet metal parts 30. A sliding table 2 which can be moved into the press has pressure pins 6 which can be moved in receiving holes in the sliding table. A tool consisting of upper tool part 3 and lower tool part 4 for a sheet metal part or a set of tools for the simultaneous forming of several sheet metal parts is placed on the sliding table. In addition to a male part or male parts, which can also be female parts, the lower tool part includes a sheet metal holder 5 for holding the outer and inner edge regions of the sheet metal parts when the ram of the press and then attached to this upper part of the tool. The sheet metal holder can be acted upon by the pressure pins 6. To apply the drawing forces and sheet holder forces and the movements required for this purpose, the drawing apparatus has, via a cross member 25, which is held on press stand sheets, drawing cylinders 20 and 21 mounted in a press-tight manner, of which the drawing cylinders 20 are arranged higher than the drawing cylinders 21 for reasons of space. The drawing cylinders can be controlled via valves 23 from a pressure supply 27, as has been described in EP 0 173 755 B1. The drawing cylinders 21 act indirectly via the cylinder's own piston rods and pressure bolts 24, the drawing cylinders 20 directly on a pressure cheek 9 which can be raised and lowered in the press table in areas in which pressure cylinders 10, 12 with the piston rods 11, 13 are attached. These pressure cylinders can be controlled via valves 16 from a pressure line 18, 19. A valve is connected to each pressure cylinder, the valves 16 and the pressure lines 18 are likewise fastened to the pressure cheek 9 and only the line part marked 19 is to be designed as a movable line and is connected for this purpose via a connection block 17. The pressure cylinders can be individually controlled by optionally controlling the valves. A piston rod 11 moved out of the pressure cylinder by pressurizing the underside of the associated piston acts in the case of actuation of the pressure cylinders 10 (indirectly) via pressure bolts 15 on pressure pins 6 in the sliding table, in the case of activation of pressure cylinders 12 via the piston rods 13 directly on pressure pins 6 in Sliding table. This type of discrete control of the pressure cylinders 10, 12 in the pressure cheek 9 can take into account the drawing conditions of sheet metal parts 30 of different types, as can be seen in FIG. 3, and also those with more or less large recesses during the forming. For the movable mounting of the pressure pins 15 and the passage of the piston rods 13 for engagement with pressure pins 6, the press table 7 has a perforated plate 14 with corresponding openings. For the discrete actuation of the drawing cylinders 20, 21, a lifting of the pressure cheek 9 from the piston rods of the drawing cylinders is necessary. For this purpose, between the piston rods of the drawing cylinder 21 and the pressure pin 24 and between the piston rods of the drawing cylinder 20 and the pressure cheek 9 provide elements that can be uncoupled from one another, for example ball sockets 22.

Die Fign. 1 und 2 zeigen den Zeitpunkt z.B. des Einrichtens der Presse, wobei das Werkzeugoberteil 3 noch an dem Pressenstößel zu befestigen ist. Es sind keine Ziehzylinder 20, 21 druckbeaufschlagt. Die Bewegungsfreiheit der Druckwange 9 ist vermittels Einstellung der Anschlageinrichtung 29 veränderbar. Die Anschlageinrichtung ist über Abstandsbolzen 28 an der Druckwange 9 befestigt.The figures 1 and 2 show the time e.g. of setting up the press, the upper tool part 3 still being attached to the press ram. There are no drawing cylinders 20, 21 pressurized. The freedom of movement of the pressure cheek 9 can be changed by means of the setting of the stop device 29. The stop device is fastened to the pressure cheek 9 via spacer bolts 28.

In Fig. 3 ist nur die Oberseite des Schiebetisches 2 veranschaulicht, der auf dem hier angedeuteten Pressentisch 7 befindlich ist und ein Lochbild aufweist für den Durchtritt und die Lagerung von Druckstiften 6. Mit 30 sind Blechteile unterschiedlichster Gestalt beispielhaft angedeutet, um die Bedeutung der unterschiedlichen Beaufschlagung von Druckstiften 6 vermittels der zuvor angesprochenen Mittel der Zieheinrichtung hervorzuheben.In Fig. 3 only the top of the sliding table 2 is illustrated, which is located on the press table 7 indicated here and has a hole pattern for the passage and the storage of pressure pins 6. With 30 sheet metal parts of different shapes are exemplified to indicate the meaning of the different Highlighting of pressure pins 6 by means of the previously mentioned means of the drawing device.

In den Fign. 4 und 5 ist das Werkzeugoberteil 3 von einem Stößel der Presse von dem Werkzeugunterteil 4 abgehoben dargestellt. Für das Halten des eingelegten Bleches bzw. Blechteils 30 sind nur außen befindliche Ziehzylinder 21 beaufschlagt worden. Die angehobene Druckwange 9 hat sich von den Kolbenstangen der innen befindlichen Druckzylinder 20 abgehoben. Mit den Ziehzylindern 21 bzw. 20 sind entsprechend auch Druckzylinder 10 über die Ventile 16 druckbeaufschlagt, deren Kolbenstangen 15 ausgefahren sind und mit den darüber befindlichen Druckstiften 6 in Wirkeingriff stehen. Während des Umformens wird somit der Blechhalter 5 nur über die angesprochenen Einheiten beaufschlagt. Der Ziehdruck sowie die erforderlichen Bewegungen, die im wesentlichen und zunächst mit dem Niedergang des Stößels Absenkbewegungen der Druckwange 9 sind, wird von den darunter befindlichen Ziehzylindern, hier beispielsweise 21, aufgebracht. Es versteht sich, daß auch weitere Ziehzylinder oder generell andere Ziehzylinder ansteuerbar sind und auf die Druckwange 9 wirken. Die Selektierung der Druckstifte 6 zur Beaufschlagung des, ggf. mehrerer Blechhalter 5, erfolgt über die angesteuerten Druckzylinder 10, 12 in der Druckwange.In Figs. 4 and 5, the upper tool part 3 is shown lifted from the lower tool part 4 by a ram of the press. To hold the inserted sheet or sheet metal part 30, only external drawing cylinders 21 have been applied. The raised pressure cheek 9 has lifted off the piston rods of the pressure cylinders 20 located on the inside. With the drawing cylinders 21 and 20, pressure cylinders 10 are accordingly also pressurized via the valves 16, the piston rods 15 of which are extended and are in operative engagement with the pressure pins 6 located above them. During the forming process, the sheet metal holder 5 is thus only acted upon by the units mentioned. The drawing pressure and the required movements, which are essentially lowering movements of the pressure cheek 9 and initially with the decline of the tappet, are applied by the drawing cylinders located below, here for example 21. It goes without saying that further drawing cylinders or generally other drawing cylinders can be actuated and act on the pressure cheek 9. The selection of the pressure pins 6 in order to act upon the, possibly a plurality of, sheet metal holders 5 takes place via the controlled pressure cylinders 10, 12 in the pressure cheek.

In gleicher Weise kann für die Auswerferbewegung der geformten Blechteile 30 aus dem Werkzeugunterteil 4 vermittels Blechhalter oder auch Ziehmatrize eine entsprechende Steuerung einzelner Ziehzylinder 20, 21 und einzelner Druckzylinder 10, 12 erfolgen, insbesondere im Hinblick auf eine Gleichlaufsteuerung während der Auswerferbewegung der Druckwange.In the same way, for the ejector movement of the shaped sheet metal parts 30 from the lower tool part 4 by means of sheet metal holders or also drawing die a corresponding control of individual drawing cylinders 20, 21 and individual printing cylinders 10, 12 take place, in particular with regard to a synchronization control during the ejector movement of the printing cheek.

Claims (4)

  1. Drawing device in the press table (7) of a press having a pressure cheek (9) which can be acted upon in a raisable manner by drawing cylinders (20, 21) during the forming of sheet-metal parts (30) against the tensile force of the press ram and for the ejection of the sheet-metal parts (30) from the die bottom part (4), and having pressure pins (6) between the pressure check (9) and a blank holder (5) of the die bottom part (4) for the transmission of the drawing and ejector motions and forces, characterized in that in the pressure cheek (9) there are mounted individually drivable pressure cylinders (10, 12) in a number corresponding to the number of pressure pins (6), the pressure cylinders (10, 12) being arranged in a perpendicular, coaxial extent to the pressure pins (6) and displaying piston surfaces, which are pressurized from below, for the bearing contact of each of the piston rods (11, 13) from below against one of the pressure pins (6) in each case.
  2. Drawing device according to Claim 1, characterized in that drawing cylinders (20, 21), in the number corresponding to the number of pressure pins (6), are arranged, fixed to the press, in a perpendicular, coaxial extent to the pressure pins (6) and beneath the pressure cylinders (10, 12), and in that piston rods of the drawing cylinders (20, 21) are pressurized from below such that they can be placed against the pressure cheek (9) in the region of pressure cylinders (10, 12) or can be separated from the pressure cheek.
  3. Drawing device according to Claim 1 or 2, characterized in that the pressure cylinders (10, 12) are connected to a common pressure line (18, 19), and a pilot valve (16) is disposed in each case in the lines to each of the pressure cylinders (10, 12) for the alternate pressurization of the pressure cylinders (10, 12).
  4. Drawing device according to Claim 1 or 2, characterized in that the valves (16) for the alternate pressurization of the pressure cylinders (10, 12) are fitted to or on the pressure cheek (9).
EP92106511A 1991-04-20 1992-04-15 Drawing device in the table of a press Expired - Lifetime EP0510507B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4112943 1991-04-20
DE4112943A DE4112943A1 (en) 1991-04-20 1991-04-20 DRAWING DEVICE IN THE PRESS TABLE OF A PRESS

Publications (2)

Publication Number Publication Date
EP0510507A1 EP0510507A1 (en) 1992-10-28
EP0510507B1 true EP0510507B1 (en) 1995-12-06

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EP92106511A Expired - Lifetime EP0510507B1 (en) 1991-04-20 1992-04-15 Drawing device in the table of a press

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US (1) US5241849A (en)
EP (1) EP0510507B1 (en)
DE (2) DE4112943A1 (en)
ES (1) ES2083017T3 (en)

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US5660074A (en) * 1991-06-17 1997-08-26 Toyota Jidosha Kabushiki Kaisha Method of selecting a preload oil pressure valve for a die cushion pin pressure equalizing system of a press machine
JP2776196B2 (en) * 1993-04-28 1998-07-16 トヨタ自動車株式会社 Diagnosis method and device for pressure equalizing cushion device
DE4324963A1 (en) * 1993-07-24 1995-01-26 Erfurt Umformtechnik Gmbh Sheet holder for single-acting presses, especially for mechanical presses and transfer presses
JP2812201B2 (en) * 1994-07-15 1998-10-22 トヨタ自動車株式会社 Press equipment
US5706696A (en) * 1996-09-09 1998-01-13 Wagner; Wendell J. Modular pressure set and system for stamping press
CN101791654B (en) * 2010-03-10 2012-03-28 奇瑞汽车股份有限公司 Method for mounting ejector rods of mould
CN101869947A (en) * 2010-06-01 2010-10-27 奇瑞汽车股份有限公司 Method for installing ejector rods of dies
JP5823745B2 (en) * 2011-06-27 2015-11-25 本田技研工業株式会社 Press molding method and press molding apparatus
DE102013219819A1 (en) * 2013-09-30 2015-04-02 Allgaier Werke Gmbh Device for forming a workpiece from sheet metal

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EP0173755B1 (en) * 1984-06-29 1989-02-01 L. SCHULER GmbH Drawing device in a press
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Also Published As

Publication number Publication date
DE4112943A1 (en) 1992-10-22
US5241849A (en) 1993-09-07
DE59204539D1 (en) 1996-01-18
ES2083017T3 (en) 1996-04-01
EP0510507A1 (en) 1992-10-28

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