EP0173755A1 - Drawing device in a press - Google Patents

Drawing device in a press Download PDF

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Publication number
EP0173755A1
EP0173755A1 EP84107551A EP84107551A EP0173755A1 EP 0173755 A1 EP0173755 A1 EP 0173755A1 EP 84107551 A EP84107551 A EP 84107551A EP 84107551 A EP84107551 A EP 84107551A EP 0173755 A1 EP0173755 A1 EP 0173755A1
Authority
EP
European Patent Office
Prior art keywords
pressure
sheet metal
metal holder
cylinder
cheek
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.)
Granted
Application number
EP84107551A
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German (de)
French (fr)
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EP0173755B1 (en
Inventor
Franz Schneider
Peter Pfeifle
Wolfgang Michael
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L Schuler GmbH
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L Schuler GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by L Schuler GmbH filed Critical L Schuler GmbH
Priority to EP84107551A priority Critical patent/EP0173755B1/en
Priority to DE8484107551T priority patent/DE3476524D1/en
Priority to US06/743,080 priority patent/US4601190A/en
Priority to BR8503119A priority patent/BR8503119A/en
Publication of EP0173755A1 publication Critical patent/EP0173755A1/en
Application granted granted Critical
Publication of EP0173755B1 publication Critical patent/EP0173755B1/en
Expired legal-status Critical Current

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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
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders

Definitions

  • the invention relates to a drawing device in a press, with a pressure cheek that is adjustably mounted in the press table and can be moved via at least one printing unit, and with a number of pressure cylinders for holding the drawing workpiece that cooperate with the parts of the sheet metal holder and the parts of the sheet metal holder Drawing tool parts and, if necessary, for ejecting the drawing workpiece to be deformed in the drawing tool parts.
  • Devices of this type are generally known in presses and e.g. Can be used in the drawing stage of a transfer press.
  • DE-OS 28 24 723 describes a method for forming the edge flange in angled corners in drawing workpieces, a drawing tool and a sheet metal holder therefor, the sheet metal holder acting with graduated holding force on the drawing workpiece to avoid material accumulations due to contraction during the drawing process.
  • DE-PS 32 02 134 describes a pulling device for a press which has a pressure cheek which can be moved in the press table.
  • the pressure cheek is located below a clamping plate for the lower part of the tool and is in a frame-fixed print cylinder supported.
  • a number of pressure cylinders, which act on the ejector pins in the lower part of the tool via a pin plate, are arranged with the pressure cheek. The pressure cheek is lowered due to the pulling process over the pin plate and the ejector pins.
  • the piston of the pressure cylinder in the sense of an ejector for drawing the workpiece to be low, however, applied to the same pressure for all the printing cylinder while the ram beam being pneumatically in the traversed downward position ehal- g th.
  • the pressure cheek retracts with a time delay to act on the pin plate at the start of the next drawing process.
  • DE-OS 32 42 705 describes a die cushion for a sheet metal drawing press with a number of pressure cylinders permanently installed in the press table, the working pistons of which act together on a pressure cheek at spaced-apart pressure points.
  • the pressure in each pressure cylinder can be adjusted to differing pressure levels via pilot control units.
  • the object is achieved according to the invention in that the pressure cylinders cooperating with the pressure cheek and with the sheet holder are rigidly fastened to the cylinder housings in the press table for the operating state, the cylinder spaces are possibly formed by the press table in that the pistons of the pressure cylinders are on both sides Piston rods are led out of the cylinder housings, interact with the sheet metal holder at one end and with the pressure cheek at the other end, and that the cylinder space of each pressure cylinder on the piston side facing away from the sheet metal holder is separated by a flow-variable valve with passive control with one drain, with active control with one Printing unit for the pressure medium is flow-connected.
  • the special embodiment of the invention according to the characterizing part of claim 2 avoids additional control effort.
  • the enlarging cylinder space below the piston of each pressure cylinder fills e.g. from a reservoir located above the pressure cylinder.
  • circuit structure can be hydraulic, pneumatic as well as mixed hydraulic / pneumatic in order to take advantage of e.g. damped starting and stopping of one and the other system while avoiding the disadvantages, e.g. Rust formation due to moisture precipitation.
  • FIGS. 1 and 6 there is a tool upper part with 1 attached to the ram of a press, a press table with 2, a pressure cheek with 3, a first pressure cylinder with 4 fixedly arranged in the press table 2 and others in the press table 2 for the press operation (drawing processes ) fixedly arranged, otherwise interchangeable and / or adjustable in the sense of transverse movements when setting up the drawing tool with 6.
  • the plunger or the tool upper part 1, which can be moved in relation to the press table 2, has an ejector plate 7, which ejects a shaped drawing workpiece 9 via one or more ejector rods 8 during the plunger run-up from the upper tool part 1.
  • the drawing workpiece 9 lies in FIGS.
  • the sheet metal holder 11 is supported by piston rods 13 of the pressure cylinder 6.
  • the housing of the pressure cylinder 6 can also be formed by cavities in the press table 2, taking standard dimensions into account.
  • the piston rods 13 are on both sides of the housing of the Druckzy Linder 6 and on the one hand with the sheet metal holder 11, on the other hand with the pressure cheek 3 in operative connection.
  • the drawing workpiece 9 inserted into the tool from the upper tool part 1 and a lower tool part 12, here drawn as a male part, is to be deformed in the drawing process, as shown in FIGS. 1 to 5.
  • the counter-holding force between the sheet metal holder 11 and the upper part 1 of the tool during the drawing process is applied by the pressure cylinders 6 with appropriate control (FIG. 6).
  • the separate control of each individual pressure cylinder 6 enables an adjustment to deformation-specific conditions, particularly in the corner areas of the drawn parts.
  • the drawing of the drawing workpiece 9 can also take place via separate ejectors 14 according to FIG. 5.
  • Fig. 2 shows the completed molding process, wherein the one ends of the piston rods 13 are guided into the area of the pressure cheek 3 lowered before or during the molding process, but without touching it. Otherwise, the ends of the piston rods 13 can then rest on the pressure cheek 3 if the latter is carried along with the tappet movement.
  • FIG. 3 shows the completed start-up process
  • the drawing workpiece 9 is pressed out of the upper tool part 1 by means of the pressure plate 7 and the ejector rod (s) 8.
  • the pressure cylinder 4 is acted upon by the pump unit 16 (FIG. 6), possibly from a pressure accumulator 31, in order to pull the drawing workpiece 9 via the pressure cheek 3, the piston rods 13 and the sheet metal holder 11 in raise the transport plane for the drawing workpiece 9.
  • FIG. 4 After the sheet metal holder 11 has been raised, the Pressure cylinder 4 reversed in order to lower the pressure cheek 3 via its piston rod 15.
  • pressure cylinder 4 Another possibility provides for the pressure cylinder 4 to be controlled via the multi-way valve 18 shown in FIG. 6 in such a way that the pressure cheek 3 follows the movement of the upper tool part 1.
  • the pressure for raising the pressure cheek 3 can then also be derived from the pressure accumulator 31.
  • Fig. 5 the ejector operation and the lifting of the drawing workpiece 9 in the transport plane are effected separately via e.g. Hydraulic pressure cylinder controllable ejector 14 is shown, the sheet metal holder 11 is to be lifted by means of the pressure cheek 3 regardless of the raising of the drawing workpiece 9 or with a time delay to accommodate a new drawing workpiece 9.
  • Fig. 6 shows a basic circuit structure using the components explained in Figs. 1 to 5 with a pressure unit from a pump unit 16, a pre-pressure unit 17, a multi-way valve 18, which via pipes 19 to the upper and lower pressure chambers 21, 22 of the
  • the first pressure cylinder 4 is connected to selectively pressurize the pressure cylinder 4 in one or the other adjustment direction.
  • the upper pressure chamber 21 is flow-connectable via the multi-way valve 18, the lower pressure chamber 22 via an adjustable safety valve 23 with a pressure relief 25.
  • the upward and downward movements of the piston 24, the piston rod 15 and, via this, the pressure cheek 3 take place by switching the multi-way valve 18 into corresponding switching positions.
  • the lower pressure chambers 26 of the pressure cylinder 6, of which four pressure cylinders are shown, but which are present in number of discrete pressure points on the sheet metal holder 11, are each via a controllable proportional valve 27, which can also be a pressure limiting valve or, for example, a throttle valve, with which Pressure relief 25 connected. Parallel to these proportional valves 27, a common or a non-return valve 28 is connected, which block in the direction of the pressure drain and is fluidly connected to a pressure medium reservoir 29 for filling the lower pressure chambers 26 when the pressure cheek 3 is raised.
  • the upper pressure chambers (not shown in detail) are the pressure cylinders 6 connected to the atmosphere, an internal gas or a pressureless medium during press operation. For the tool change, for example, it is necessary to apply pressure to the upper pressure chambers in order to hold the sheet metal holder 11 or lower the piston rods 13. The lowering process is possible by means of the existing pressure unit or another pressure unit and corresponding control means.
  • the piston rods 13, the pressure cylinder 6 and the sheet metal holder 11 are to be brought into a position corresponding to the transport plane for the drawing workpieces in order to receive a new drawing workpiece 9.
  • the pressure cheek 3 must be raised with the corresponding switching position of the multi-way valve 18 (right switching position) and when the lower pressure chamber 22 is acted upon.
  • pressure fluid flows from the pressure fluid reservoir 29 via the check valves 28 in the bottom, situated under the piston 30 Druckkam - numbers 26 a of the impression cylinder. 6
  • the pressure cheek 3 is then brought into the lower position by switching the multi-way valve 18 (left switching position).
  • the pressure cylinder 6 builds up in the lower pressure chambers 26 a pressure that can be set for each pressure cylinder 6 by means of the proportional valves 27. It is understood that the pulling device is not tied to the vertical position as shown and described. In contrast to the passive control described above, however, active control of the lower pressure chambers 26 of the pressure cylinders 6 is also possible by means of a pressure unit and separately quantity-controlled valves (proportional valves). For a movement sequence of the pressure cheek 3 that is synchronized with the tappet movement, the upper and the lower pressure chamber 21, 22 can optionally be connected to the pressure accumulator 31 or a pressure relief 25.
  • the switch positions of the multi-way valve 18 and a corresponding, pressure-regulating measure of the pump unit 16 have not been shown in particular since they are easy to imagine. It is essential here that the pressure cheek 3 with a lower pressure (n ⁇ 10%) than is required as a counter pressure when pulling, the plunger must be tracked when it is raised.

Abstract

Bei Ziehwerkstücken (9), insbesondere großflächigen Karosserieteilen oder Spültischabdeckungen bestehen im Bereich der Eckenformung die Möglichkeiten des Reißens der Wandung bzw. gewellter Oberflächenstruktur. Die Erfindung geht von daher aus von dem Gedanken, den Blechhalterdruck in den verschiedenen Andruckbereichen für das Ziehwerkstück (9) der Formung anzupassen. Hierzu dienen eine Anzahl fest in dem Pressentisch (2) installierter Druckzylinder (6), deren Kolbenstangen (13) über eine auf alle Kolbenstagen (13) gemeinsam wirkende Druckwange (3) höhenmäßig verfahrbar sind. Die anderenends auf den Blechhalter (11) wirkenden Kolbenstangen (13) sind unter der Stößelbewegung gegen den über Ventile (27) in den Druckkammern (26) unterschiedlich steuerbaren Druck absenkbar.In the case of drawing workpieces (9), in particular large body parts or sink coverings, there is the possibility of tearing the wall or corrugated surface structure in the area of the corner formation. The invention is therefore based on the idea of adapting the sheet metal holder pressure in the various pressure areas for the drawing workpiece (9) to the shaping. A number of pressure cylinders (6) permanently installed in the press table (2) are used for this purpose, the piston rods (13) of which can be moved in terms of height via a pressure cheek (3) acting jointly on all piston days (13). The piston rods (13), which act on the sheet metal holder (11) at the other end, can be lowered under the plunger movement against the pressure which can be controlled differently in the pressure chambers (26) via valves (27).

Description

Die Erfindung betrifft eine Zieheinrichtung in einer Presse, mit einer im Pressentisch verstellbar gelagerten und über zumindest eine Druckeinheit bewegbaren Druckwange und mit einer Anzahl von mit der Druckwange und einem Blechhalter, bei Mehrteiligkeit des Blechhalters mit den Teilen des Blechhalters zusammenwirkenden Druckzylindern zum Halten des Ziehwerkstückes an Ziehwerkzeugteilen und ggf. zum Auswerfen des in den Ziehwerkzeugteilen zu verformenden Ziehwerkstückes. Einrichtungen dieser Art sind in Pressen allgemein bekannt und z.B. in der Ziehstufe einer Transferpresse einsetzbar.The invention relates to a drawing device in a press, with a pressure cheek that is adjustably mounted in the press table and can be moved via at least one printing unit, and with a number of pressure cylinders for holding the drawing workpiece that cooperate with the parts of the sheet metal holder and the parts of the sheet metal holder Drawing tool parts and, if necessary, for ejecting the drawing workpiece to be deformed in the drawing tool parts. Devices of this type are generally known in presses and e.g. Can be used in the drawing stage of a transfer press.

Bei insbesondere großflächigen Ziehwerkstücken, wie z.B. Karosserieteilen oder Spültischabdeckungen, ist es erforderlich, daß die Bereiche größerer Abwinklungen in Verbindung mit Eckenbildung gleiche Oberflächengüte und -struktur aufweisen wie die übrigen Oberflächenbereiche. Ein zu hoher Auflagendruck des Blechhalters führt zu Rissen in der Wandung, ein zu niederer Auflagendruck führt zu Faltungen und Wellungen in der Oberflächenstruktur der Ziehwerkstücke.For especially large-area drawing workpieces, such as Body parts or sink cover, it is necessary that the areas of larger bends in connection with corner formation have the same surface quality and structure as the other surface areas. A too high contact pressure of the sheet metal holder leads to cracks in the wall, a too low contact pressure leads to folds and corrugations in the surface structure of the drawing workpieces.

In der DE-OS 28 24 723 wird ein Verfahren zur Ausbildung des Randflansches in abgewinkelten Ecken bei Ziehwerkstücken, ein Ziehwerkzeug und ein Blechhalter dafür beschrieben, wobei der Blechhalter zur Vermeidung von Materialansamnlungen infolge Kontraktion während des Ziehvorganges mit abgestufter Haltekraft auf das Ziehwerkstück wirkt.DE-OS 28 24 723 describes a method for forming the edge flange in angled corners in drawing workpieces, a drawing tool and a sheet metal holder therefor, the sheet metal holder acting with graduated holding force on the drawing workpiece to avoid material accumulations due to contraction during the drawing process.

In der DE-PS 32 02 134 wird eine Zieheinrichtung für eine Presse beschrieben, die eine in dem Pressentisch verschiebliche Druckwange aufweist. Die Druckwange befindet sich unterhalb einer Aufspannplatte für das Werkzeugunterteil und ist in einem gestellfesten Druckzylinder abgestützt. Mit der Druckwange höhenmäßig verfahrbar sind eine Anzahl Druckzylinder angeordnet, die über eine Stiftplatte auf Auswerferstifte im Werkzeugunterteil wirken. Die Druckwange wird infolge des Ziehvorganges über die Stiftplatte und die Auswerferstifte abgesenkt. Nach dem Ziehvorgang werden die Kolben der Druckzylinder im Sinne einer Auswerferbewegung für das Ziehwerkstück mit geringem, für alle Druckzylinder jedoch gleichem Druck beaufschlagt, während die Druckwange pneumatisch in der nach unten verfahrenen Position gehal- ten ist. Die Druckwange fährt zeitverzögert nach, um zu Eeginn des nächsten Ziehvorganges auf die Stiftplatte einzuwirken.DE-PS 32 02 134 describes a pulling device for a press which has a pressure cheek which can be moved in the press table. The pressure cheek is located below a clamping plate for the lower part of the tool and is in a frame-fixed print cylinder supported. A number of pressure cylinders, which act on the ejector pins in the lower part of the tool via a pin plate, are arranged with the pressure cheek. The pressure cheek is lowered due to the pulling process over the pin plate and the ejector pins. After the drawing operation, the piston of the pressure cylinder in the sense of an ejector for drawing the workpiece to be low, however, applied to the same pressure for all the printing cylinder while the ram beam being pneumatically in the traversed downward position ehal- g th. The pressure cheek retracts with a time delay to act on the pin plate at the start of the next drawing process.

In der DE-OS 32 42 705 wird ein Ziehkissen für eine Blechziehpresse beschrieben mit einer Anzahl im Pressentisch fest installierter Druckzylinder, deren Arbeitskolben gemeinsam in voneinander beabstandeten Druckpunkten auf eine Druckwange einwirken. Um Faltenbildungen und Risse in dem Ziehwerkstück während des Umformvorganges zu vermeiden, ist der Druck in jedem Druckzylinder über Vorsteuereinheiten auf voneinander abweichende Druckhohen einstellbar.DE-OS 32 42 705 describes a die cushion for a sheet metal drawing press with a number of pressure cylinders permanently installed in the press table, the working pistons of which act together on a pressure cheek at spaced-apart pressure points. In order to avoid wrinkles and cracks in the drawing workpiece during the forming process, the pressure in each pressure cylinder can be adjusted to differing pressure levels via pilot control units.

Demgegenüber ist es Aufgabe der Erfindung, den auf die unterschiedlichen Ziehverhältnisse an einem Ziehwerkstück separat angepaßten Gegenhaltedruck in den Druckzylindern direkt auf den Blechhalter wirken zu lassen.In contrast, it is an object of the invention to have the counter pressure in the pressure cylinders, which is separately adapted to the different drawing conditions on a drawing workpiece, act directly on the sheet metal holder.

Die Aufgabe ist nach der Erfindung dadurch gelöst, daß die mit der Druckwange und mit dem Blechhalter zusaimenwirkenden Druckzylinder mit den Zylindergehäusen in dem Pressentisch für den Betriebszustand starr befestigt sind, die Zylinderräune ggf. durch den Pressentisch gebildet sind, daß die Kolben der Druckzylinder beidseitig über Kolbenstangen aus den Zylindergehäusen herausgeführt sind, einerends mit dem Blechhalter und anderenends mit der Druckwange zusammenwirken, und daß der Zylinderraum jedes Druckzylinders auf der dem Blechhalter abgewandten Kolbenseite separat über je ein im Durchfluß veränderbares Ventil bei passiver Steuerung mit einem Abfluß, bei aktiver Steuerung mit einem Druckaggregat für das Druckmedium fließverbunden ist.The object is achieved according to the invention in that the pressure cylinders cooperating with the pressure cheek and with the sheet holder are rigidly fastened to the cylinder housings in the press table for the operating state, the cylinder spaces are possibly formed by the press table in that the pistons of the pressure cylinders are on both sides Piston rods are led out of the cylinder housings, interact with the sheet metal holder at one end and with the pressure cheek at the other end, and that the cylinder space of each pressure cylinder on the piston side facing away from the sheet metal holder is separated by a flow-variable valve with passive control with one drain, with active control with one Printing unit for the pressure medium is flow-connected.

Die besondere Ausgestaltung der Erfindung nach dem Kennzeichen des Anspruches 2 vermeidet zusätzlichen Steuerungsaufwand. Der sich vergrößernde Zylinderraum unterhalb des Kolbens jedes Druckzylinders füllt sich z.B. aus einem oberhalb der Druckzylinder befindlichen Reservoir auf.The special embodiment of the invention according to the characterizing part of claim 2 avoids additional control effort. The enlarging cylinder space below the piston of each pressure cylinder fills e.g. from a reservoir located above the pressure cylinder.

Vorteile der Erfindung ergeben sich aus dem geringen Schaltungsaufwand und daraus, daß alle Druckzylinder in der Presse bzw. in dem Pressentisch für den Betriebszustand fest installiert, für z.B. den Werkzeugwechsel auf geänderte Blechhalterabemessungen in ihren Lagen versetzbar sind.Advantages of the invention result from the low circuit complexity and from the fact that all the pressure cylinders are permanently installed in the press or in the press table for the operating state, for e.g. the tool change can be moved to changed sheet metal holder dimensions in their positions.

Weitere Vorteile ergeben sich aus dem durch die Erfindung erleichterten Einfahrbetrieb der Presse und daraus, daß der Schaltungsaufbau hydraulisch, pneumatisch als auch gemischt hydraulisch/pneumatisch ausgeführt sein kann, um die Vorteile, z.B. gedämpftes Anfahren und Anhalten, des einen wie auch des anderen Systemes unter Vermeidung der Nachteile, z.B. Rostbildung infolge Feuchtigkeitsniederschlag, zu nutzen.Further advantages result from the retracting operation of the press which is facilitated by the invention and from the fact that the circuit structure can be hydraulic, pneumatic as well as mixed hydraulic / pneumatic in order to take advantage of e.g. damped starting and stopping of one and the other system while avoiding the disadvantages, e.g. Rust formation due to moisture precipitation.

Im folgenden wird die Erfindung anhand von zwei in den Figuren dargestellten Ausführungsbeispielen erläutert. Es zeigen:

  • Fig. 1 bis 4 den Ziehvorgang eines Blechteiles in vereinfachter Darstellung,
  • Fi. 5 die Anwendung von Blechhalter unabhängiger Auswerfer in vereinfachter Darstellung und
  • Fig. 6 einen Schaltungsaufbau für die hydraulische Ansteuerung der Druckzylinder.
The invention is explained below with reference to two exemplary embodiments shown in the figures. Show it:
  • 1 to 4 the drawing process of a sheet metal part in a simplified representation,
  • Fi. 5 the application of sheet holder independent ejector in a simplified representation and
  • Fig. 6 shows a circuit structure for the hydraulic control of the pressure cylinder.

In den Figuren 1 und 6 ist ein an dem Stößel einer Presse befestigtes Werkzeugoberteil mit 1, ein Pressentisch mit 2, eine Druckwange mit 3, ein erster in dem Pressentisch 2 fest angeordneter Druckzylinder mit 4 und weitere in dem Pressentisch 2 für den Pressenbetrieb (Ziehvorgänge) fest angeordnete, ansonsten austauschbar und/oder im Sinne von Querbewegungen beim Einrichten des Ziehwerkzeuges verstellbare Druckzylinder mit 6 beziffert. Der in Bezug auf den Pressentisch 2 verfahrbare Stößel bzw. das Werkzeugoberteil 1 weist eine Auswerferplatte 7 auf, die über eine oder mehrere Auswerferstange/n 8 ein geformtes Ziehwerkstück 9 während des Stößelhochganges aus dem Werkzeugoberteil 1 auswirft. Das Ziehwerkstück 9 liegt in den Fig. 1, 4, 5 und 6 in Höhe der Transportebene auf einem Blechhalter 11, der ggf. auch geteilt ausgeführt sein kann. Der Blechhalter 11 ist über Kolbenstangen 13 der Druckzylinder 6 abgestützt. Die Gehäuse der Druckzylinder 6 können unter Berücksichtigung von Normabmessungen auch durch Hohlräume in dem Pressentisch 2 gebildet werden. Die Kolbenstangen 13 stehen beiderseits aus den Gehäusen der Druckzylinder 6 hervor und einerseits mit dem Blechhalter 11, andererseits mit der Druckwange 3 in Wirkverbindung. Das in das Werkzeug aus Werkzeugoberteil 1 und einem Werkzeugunterteil 12, hier als Patrize gezeichnet, eingelegte Ziehwerkstück 9 ist, wie es die Figuren 1 bis 5 zeigen, im Ziehverfahren zu verformen. Die Gegenhaltekraft zwischen Blechhalter 11 und Werkzeugoberteil 1 während des Ziehvorganges wird von den Druckzylindern 6 bei entsprechender Ansteuerung (Fig. 6) aufgebracht. Das segarate Ansteuern jedes einzelnen Druckzylinders 6 ermöglicht eine Einstellung auf verformungsspezifische Verhältnisse insbesondere in den Eckbereichen der Ziehteile. Die über den Druckzylinder 4, von dem auch mehrere parallelwirkend angeordnet sein können, höhenmäßig verfahrbare Druckwange 3 dient zum einen dem Hochbringen des Blechhalters 11 in die Stellung zum Einlegen des Ziehwerkstückes 9, zum anderen dem Auswerfen des Ziehwerkstückes 9 bis in die Transportebene. Das Auswerfen des Ziehwerkstückes 9 kann jedoch auch über separate Auswerfer 14 nach Fig. 5 erfolgen. Während des Ziehvorganges, Niederführen des Stößels mit dem Werkzeugoberteil 1, setzt dieses zunächst auf dem Ziehwerkstück 9 im Bereich des Blechhalters 11 auf. Der weitere Niedergang des Werkzeugoberteiles 1 und das Formen des Ziehwerkstückes 9 im Werkzeugunterteil 12 erfolgt entgegen des sich mit der Abwärtsbewegung der Kolbenstangen 13 bzw. der Kolben 30 (Fig. 6) in den Druckzylindern 6 aufbauenden Druckes.In FIGS. 1 and 6 there is a tool upper part with 1 attached to the ram of a press, a press table with 2, a pressure cheek with 3, a first pressure cylinder with 4 fixedly arranged in the press table 2 and others in the press table 2 for the press operation (drawing processes ) fixedly arranged, otherwise interchangeable and / or adjustable in the sense of transverse movements when setting up the drawing tool with 6. The plunger or the tool upper part 1, which can be moved in relation to the press table 2, has an ejector plate 7, which ejects a shaped drawing workpiece 9 via one or more ejector rods 8 during the plunger run-up from the upper tool part 1. The drawing workpiece 9 lies in FIGS. 1, 4, 5 and 6 at the level of the transport plane on a sheet metal holder 11, which can optionally also be made in two parts. The sheet metal holder 11 is supported by piston rods 13 of the pressure cylinder 6. The housing of the pressure cylinder 6 can also be formed by cavities in the press table 2, taking standard dimensions into account. The piston rods 13 are on both sides of the housing of the Druckzy Linder 6 and on the one hand with the sheet metal holder 11, on the other hand with the pressure cheek 3 in operative connection. The drawing workpiece 9 inserted into the tool from the upper tool part 1 and a lower tool part 12, here drawn as a male part, is to be deformed in the drawing process, as shown in FIGS. 1 to 5. The counter-holding force between the sheet metal holder 11 and the upper part 1 of the tool during the drawing process is applied by the pressure cylinders 6 with appropriate control (FIG. 6). The separate control of each individual pressure cylinder 6 enables an adjustment to deformation-specific conditions, particularly in the corner areas of the drawn parts. The pressure cheek 3, which can be moved in height via the pressure cylinder 4, of which several can also be arranged in parallel, serves to bring the sheet metal holder 11 up to the position for inserting the drawing workpiece 9, and on the other hand to eject the drawing workpiece 9 into the transport plane. However, the drawing of the drawing workpiece 9 can also take place via separate ejectors 14 according to FIG. 5. During the drawing process, lowering the plunger with the upper tool part 1, the plunger first places it on the drawing workpiece 9 in the area of the sheet metal holder 11. The further decline of the upper tool part 1 and the shaping of the drawing workpiece 9 in the lower tool part 12 takes place counter to the pressure building up in the pressure cylinders 6 with the downward movement of the piston rods 13 or the pistons 30 (FIG. 6).

Fig. 2 zeigt den beendeten Formvorgang, wobei die einen Enden der Kolbenstangen 13 bis in den Bereich der vor dem oder während des Formvorganges abgesenkten Druckwange 3 geführt sind, ohne diese jedoch zu berühren. Anderenfalls können die Enden der Kolbenstangen 13 dann auf der Druckwange 3 aufliegen, wenn diese mit der Stößelbewegung mitgeführt wird.Fig. 2 shows the completed molding process, wherein the one ends of the piston rods 13 are guided into the area of the pressure cheek 3 lowered before or during the molding process, but without touching it. Otherwise, the ends of the piston rods 13 can then rest on the pressure cheek 3 if the latter is carried along with the tappet movement.

Während des Hochfahrens des Stößels unter Mitnahme des Werkzeugcberteiles 1, Fig. 3 zeigt den beendeten Hochfahrvorgang, wird das Ziehwerkstück 9 vermittels der Druckplatte 7 und der/den Auswerferstange/n 8 aus dem Werkzeugoberteil 1 herausgedrückt. Zugleich oder zeitversetzt zu dem Hochfahren von Stößel und Werkzeugoberteil 1 wird der Druckzylinder 4 aus dem Pumpenaggregat 16 (Fig. 6), ggf. aus einem Druckspeicher 31 beaufschlagt, um das Ziehwerkstück 9 über die Druckwange 3, die Kolbenstangen 13 und den Blechhalter 11 in die Transportebene für das Ziehwerkstück 9 anzuheben. Den beendeten Vorgang zeigt Fig. 4. Nach dem Hochfahren des Blechhalters 11 wird der Druckzylinder 4 umgesteuert, um die Druckwange 3 über dessen Kolbenstange 15 abzusenken. Eine weitere Möglichkeit sieht vor, den Druckzylinder 4 derart über das in Fig. 6 gezeigte Mehrwegeventil 18 zu steuern, daß die Druckwange 3 der Bewegung des Werkzeugoberteiles 1 folgt. Der Druck für das Hochfahren der Druckwange 3 kann dann gleichfalls aus dem Druckspeicher 31 abgeleitet werden.3 shows the completed start-up process, the drawing workpiece 9 is pressed out of the upper tool part 1 by means of the pressure plate 7 and the ejector rod (s) 8. At the same time or at a different time from the ram and tool upper part 1 being raised, the pressure cylinder 4 is acted upon by the pump unit 16 (FIG. 6), possibly from a pressure accumulator 31, in order to pull the drawing workpiece 9 via the pressure cheek 3, the piston rods 13 and the sheet metal holder 11 in raise the transport plane for the drawing workpiece 9. The finished process is shown in FIG. 4. After the sheet metal holder 11 has been raised, the Pressure cylinder 4 reversed in order to lower the pressure cheek 3 via its piston rod 15. Another possibility provides for the pressure cylinder 4 to be controlled via the multi-way valve 18 shown in FIG. 6 in such a way that the pressure cheek 3 follows the movement of the upper tool part 1. The pressure for raising the pressure cheek 3 can then also be derived from the pressure accumulator 31.

In Fig. 5 sind den Auswerfervorcgang und das Anheben des Ziehwerkstückes 9 in die Transportebene bewirkende, separat über z.B. Hydraulikdruckzylinder ansteuerbare Auswerfer 14 gezeigt, wobei der Blechhalter 11 unabhängig von dem Hochbringen des Ziehwerkstückes 9 oder zeitversetzt dazu zur Aufnahme eines neuen Ziehwerkstückes 9 noch vermittels der Druckwange 3 anzuheben ist.In Fig. 5 the ejector operation and the lifting of the drawing workpiece 9 in the transport plane are effected separately via e.g. Hydraulic pressure cylinder controllable ejector 14 is shown, the sheet metal holder 11 is to be lifted by means of the pressure cheek 3 regardless of the raising of the drawing workpiece 9 or with a time delay to accommodate a new drawing workpiece 9.

Fig. 6 zeigt einen prinzipiellen Schaltungsaufbau unter Verwendung der in den Fig. 1 bis 5 erläuterten Bauteile mit einer Druckeinheit aus einem Pumpenaggregat 16, einer Vordruckeinheit 17, einem Mehrwegeventil 18, das über Rohrleitungen 19 an die obere bzw. untere Druckkammer 21, 22 des ersten Druckzylinders 4 angeschlossen ist zur wahlweisen Druckbeaufschlagung des Druckzylinders 4 in die eine oder in die andere Verstellrichtung. Die obere Druckkammer 21 ist über das Mehrwegeventil 18, die untere Druckkammer 22 ist über ein einstellbares Sicherheitsventil 23 mit einem Druckablaß 25 fließverbindbar. Die Hochfahr- und Absenkbewegungen des Kolbens 24, der Kolbenstange 15 und über diese der Druckwange 3 erfolgt durch Schalten des Mehrwegeventiles 18 in entsprechende Schaltstellungen.Fig. 6 shows a basic circuit structure using the components explained in Figs. 1 to 5 with a pressure unit from a pump unit 16, a pre-pressure unit 17, a multi-way valve 18, which via pipes 19 to the upper and lower pressure chambers 21, 22 of the The first pressure cylinder 4 is connected to selectively pressurize the pressure cylinder 4 in one or the other adjustment direction. The upper pressure chamber 21 is flow-connectable via the multi-way valve 18, the lower pressure chamber 22 via an adjustable safety valve 23 with a pressure relief 25. The upward and downward movements of the piston 24, the piston rod 15 and, via this, the pressure cheek 3 take place by switching the multi-way valve 18 into corresponding switching positions.

Die unteren Druckkammern 26 der Druckzylinder 6, von denen vier Druckzylinder dargestellt sind, die aber in Anzahl diskreter Druckpunkte an dem Blechhalter 11 vorhanden sind, sind über je ein ansteuerbares Proportionalventil 27, das auch ein Druckbegrenzerventil oder auch z.B. ein Drosselventil sein kann, mit dem Druckablaß 25 verbunden. Parallel zu diesen Proportionalventilen 27 sind ein gemeinsames oder je ein Rückschlagventil 28 geschaltet, die in Richtung Druckabfluß sperren und mit einem Druckmittelreservoir 29 fließverbunden sind zum Auffüllen der unteren Druckkammern 26 beim Hochfahren der Druckwange 3. Die im einzelnen nicht dargestellten oberen Druckkammern der Druckzylinder 6 sind während des Pressenbetriebes mit der Atmosphäre, einem innerten Gas oder einem drucklosen Medium verbunden. Für den Werkzeugwechsel beispielsweise ist es erforderlich, die oberen Druckkammern mit Druck zu beaufschlagen, um den Blechhalter 11 bzw. die Kolbenstangen 13 abzusenken. Der Absenkvorgang ist vermittels des vorhandenen Druckaggregates oder eines weiteren Druckaggregates und entsprechender Steuermittel möglich.The lower pressure chambers 26 of the pressure cylinder 6, of which four pressure cylinders are shown, but which are present in number of discrete pressure points on the sheet metal holder 11, are each via a controllable proportional valve 27, which can also be a pressure limiting valve or, for example, a throttle valve, with which Pressure relief 25 connected. Parallel to these proportional valves 27, a common or a non-return valve 28 is connected, which block in the direction of the pressure drain and is fluidly connected to a pressure medium reservoir 29 for filling the lower pressure chambers 26 when the pressure cheek 3 is raised. The upper pressure chambers (not shown in detail) are the pressure cylinders 6 connected to the atmosphere, an internal gas or a pressureless medium during press operation. For the tool change, for example, it is necessary to apply pressure to the upper pressure chambers in order to hold the sheet metal holder 11 or lower the piston rods 13. The lowering process is possible by means of the existing pressure unit or another pressure unit and corresponding control means.

Wie aus dem Vorhergehenden ersichtlich ist, sind für die Aufnahme eines neuen Ziehwerkstückües 9 die Kolbenstangen 13 der Druckzylinder 6 und der Blechhalter 11 in eine Position zu bringen, die der Transportebene für die Ziehwerkstücke entspricht. Hierzu nuß bei entsprechender Schaltstellung des Mehrwegeventiles 18 (rechte Schaltstellung) und Beaufschlagung der unteren Druckkammer 22 die Druckwange 3 angehoben werden. Während des Hochfahrens der Kolbenstangen 13 fließt Druckmittel aus dem Druckmittelreservoir 29 über die Rückschlagventile 28 in die unteren, unter den Kolben 30 befindlichen Druckkam- mern 26 der Druckzylinder 6 ein. Die Druckwange 3 wird danach durch Umschalten des Mehrwegeventiles 18 (linke Schaltstellung) in die untere Stellung verbracht. Mit dem Niederfahren des Stößels und Bewegen des Werkzeugoberteiles 1 gegen das Ziehwerkstück 9 baut sich in den unteren Druckkammern 26 der Druckzylinder 6 ein für jeden Druckzylinder 6 vermittels der Proportionalventile 27 einstellbarer Druck auf. Es versteht sich, daß die Zieheinrichtung an die vertikale Lage, wie es gezeigt und beschrieben worden ist, nicht gebunden ist. Im Unterschied zu der zuvor beschriebenen passiven Steuerung ist jedoch auch eine aktive Steuerung der unteren Druckkammern 26 der Druckzylinder 6 vermittels Druckaggregat und separat mengengeregelter Ventile (Proportionalventile) möglich. Für einen synchron mit der Stößelbewegung nachgeführten Bewegungsablauf der Druckwange 3 ist die obere sowie die untere Druckkammer 21, 22 wahlweise mit dem Druckspeicher 31 bzw. einem Druckablaß 25 zu verbinden. Die Schaltstellungen des Mehrwegeventiles 18 und einer entsprechenden, druckregulierenden Maßnahme des Pumpenaggregates 16 sind, da leicht vorstellbar, nicht besonders gezeigt worden. Wesentlich hierbei ist, daß die Druckwange 3 mit geringerem Druck (n~ 10 %) als er als Gegenhaltedruck beim Ziehen erforderlich ist, dem Stößel bei dessen Hochgang nachzuführen ist.As can be seen from the foregoing, the piston rods 13, the pressure cylinder 6 and the sheet metal holder 11 are to be brought into a position corresponding to the transport plane for the drawing workpieces in order to receive a new drawing workpiece 9. For this purpose, the pressure cheek 3 must be raised with the corresponding switching position of the multi-way valve 18 (right switching position) and when the lower pressure chamber 22 is acted upon. During startup of the piston rods 13 pressure fluid flows from the pressure fluid reservoir 29 via the check valves 28 in the bottom, situated under the piston 30 Druckkam - numbers 26 a of the impression cylinder. 6 The pressure cheek 3 is then brought into the lower position by switching the multi-way valve 18 (left switching position). When the plunger is moved down and the upper tool part 1 moves against the drawing workpiece 9, the pressure cylinder 6 builds up in the lower pressure chambers 26 a pressure that can be set for each pressure cylinder 6 by means of the proportional valves 27. It is understood that the pulling device is not tied to the vertical position as shown and described. In contrast to the passive control described above, however, active control of the lower pressure chambers 26 of the pressure cylinders 6 is also possible by means of a pressure unit and separately quantity-controlled valves (proportional valves). For a movement sequence of the pressure cheek 3 that is synchronized with the tappet movement, the upper and the lower pressure chamber 21, 22 can optionally be connected to the pressure accumulator 31 or a pressure relief 25. The switch positions of the multi-way valve 18 and a corresponding, pressure-regulating measure of the pump unit 16 have not been shown in particular since they are easy to imagine. It is essential here that the pressure cheek 3 with a lower pressure (n ~ 10%) than is required as a counter pressure when pulling, the plunger must be tracked when it is raised.

Claims (2)

1. Zieheinrichtung in einer Presse, mit einer im Pressentisch (2) verstellbar gelagerten und über zumindest eine Druckeinheit (4, 16 bis 19 und 21, 22) bewegbaren Druckwange (3) und mit einer Anzahl von mit der Druckwange (3) und einem Blechhalter (11), bei Mehrteiligkeit des Blechhalters (11) mit den Teilen des Blechhalters zusammenwirkenden Druckzylindern (6) zum Halten des Ziehwerkstückes (9) an Ziehwerkzeugteilen und ggf. zum Auswerfen des in den Ziehwerkzeugteilen (1, 12) zu verformenden Ziehwerkstückes (9), dadurch gekennzeichnet, daß die mit der Druckwange (3) und mit dem Blechhalter (11) zusammenwirkenden Druckzylinder (6) mit den Zylindergehäusen in dem Pressentisch (2) für den Betriebszustand starr befestigt sind, die Zylinderräume (26) ggf. durch den Pressentisch (2) gebildet sind, daß die Kolben (30) der Druckzylinder (6) beidseitig über Kolbenstangen (13) aus den Zylindergehäusen herausgeführt sind, einerends mit dem Blechhalter (11) und anderenends mit der Druckwange (3) zusammenwirken, und daß der Zylinderraum (26) jedes Druckzylinders (6) auf der dem Blechhalter (11) abgewandten Kolbenseite separat über je ein im Durchfluß veränderbares Ventil (27) bei passiver Steuerung mit einem Abfluß (29), bei aktiver Steuerung mit einem Druckaggregat für das Druckmedium fließverbunden ist.1. Drawing device in a press, with a pressure cheek (3) which is adjustably mounted in the press table (2) and movable via at least one printing unit (4, 16 to 19 and 21, 22) and with a number of with the pressure cheek (3) and one Sheet metal holder (11), in the case of multiple parts of the sheet metal holder (11) with the parts of the sheet metal holder interacting pressure cylinders (6) for holding the drawing workpiece (9) on drawing tool parts and, if necessary, for ejecting the drawing workpiece (9) to be deformed in the drawing tool parts (1, 12) ), characterized in that the pressure cylinders (6) cooperating with the pressure cheek (3) and with the sheet metal holder (11) are rigidly fastened to the cylinder housings in the press table (2) for the operating state, the cylinder spaces (26) possibly by the Press table (2) are formed so that the pistons (30) of the pressure cylinder (6) are guided out of the cylinder housings on both sides via piston rods (13), one end with the sheet metal holder (11) and the other end with the pressure kwange (3) cooperate, and that the cylinder chamber (26) of each pressure cylinder (6) on the piston side facing away from the sheet metal holder (11) separately via a flow-variable valve (27) with passive control with a drain (29), with active Control with a printing unit for the pressure medium is fluidly connected. 2. Zieheinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jedes Ventil (27) ein ansteuerbares Proportionalventil ist, dem je ein in Abflußrichtung sperrendes Rückschlagventil (28) parallel geschaltet ist.2. Pulling device according to claim 1, characterized in that each valve (27) is a controllable proportional valve, each of which is connected in parallel in the outflow blocking check valve (28).
EP84107551A 1984-06-29 1984-06-29 Drawing device in a press Expired EP0173755B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP84107551A EP0173755B1 (en) 1984-06-29 1984-06-29 Drawing device in a press
DE8484107551T DE3476524D1 (en) 1984-06-29 1984-06-29 Drawing device in a press
US06/743,080 US4601190A (en) 1984-06-29 1985-06-10 Drawing installation in a press
BR8503119A BR8503119A (en) 1984-06-29 1985-06-28 DRAINAGE SET IN A PRESS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84107551A EP0173755B1 (en) 1984-06-29 1984-06-29 Drawing device in a press

Publications (2)

Publication Number Publication Date
EP0173755A1 true EP0173755A1 (en) 1986-03-12
EP0173755B1 EP0173755B1 (en) 1989-02-01

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US (1) US4601190A (en)
EP (1) EP0173755B1 (en)
BR (1) BR8503119A (en)
DE (1) DE3476524D1 (en)

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GB2197813A (en) * 1986-11-27 1988-06-02 Mueller Weingarten Maschf Controlling or adjusting blank holder force during a drawing process
DE3717768A1 (en) * 1987-05-26 1988-12-08 Schuler Gmbh L Drawing apparatus in the bed of a press
EP0312809A2 (en) * 1987-10-21 1989-04-26 Daimler-Benz Aktiengesellschaft Double action press for drawing sheet components
EP0312808A2 (en) * 1987-10-21 1989-04-26 Daimler-Benz Aktiengesellschaft Press for drawing sheet components
DE3807683A1 (en) * 1988-03-09 1989-09-21 Schuler Gmbh L Drawing apparatus in drawing stages of presses
US5099673A (en) * 1989-10-10 1992-03-31 L. Schuler Pressen Gmbh Drawing apparatus in drawing stages of presses
FR2667257A1 (en) * 1990-10-02 1992-04-03 Erfurt Umformtechnik Gmbh HYDRAULIC HOLDER FOR SINGLE-EFFECT PRESSES.
US5138857A (en) * 1990-04-23 1992-08-18 Maschinenfabrik Mueller-Weingarten Ag Drawing device in a press for drawing shaped sheet-metal parts
EP0573830A1 (en) * 1992-06-10 1993-12-15 Umformtechnik ERFURT GmbH Hydraulic drawing system in a press
EP0596696A1 (en) * 1992-11-05 1994-05-11 Toyota Jidosha Kabushiki Kaisha Method and device for controlling, checking or optimizing pressure of cushion pin cylinders of press by discharging fluid or initial pressure
EP0635320A1 (en) * 1993-07-24 1995-01-25 Umformtechnik ERFURT GmbH Pressure pad for single-acting presses in particular for mechanical and transfer presses
US5457980A (en) * 1992-11-05 1995-10-17 Toyota Jidosha Kabushiki Kaisha Method and device for controlling, checking or optimizing pressure of cushion pin cylinders of press by discharging fluid or initial pressure
US5471861A (en) * 1993-04-28 1995-12-05 Toyota Jidosha Kabushiki Kaisha Method and apparatus for diagnosing press cushioning device, on optimum range of blank-holding force
EP0713735A1 (en) * 1994-11-23 1996-05-29 Umformtechnik ERFURT GmbH Length compensation means in a clamping device between the upper and lower tool of a press
US5687598A (en) * 1994-07-15 1997-11-18 Toyota Jidosha Kabushiki Kaisha Press having cushioning cylinders each having two chambers whose pressure difference is adjustable to control blank-holding force
US5701778A (en) * 1994-03-03 1997-12-30 Toyota Jidosha Kabushiki Kaisha Press having gas cylinders of plastically deformable members for even distribution of blank-holding force on pressure member through cushion pins
EP1138406A2 (en) * 2000-03-30 2001-10-04 FAGOR, S.Coop A press with a hydraulic cushion and a system for controlling the force and pad position thereof

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DE4112943A1 (en) * 1991-04-20 1992-10-22 Schuler Gmbh L DRAWING DEVICE IN THE PRESS TABLE OF A PRESS
FI100646B (en) * 1995-12-14 1998-01-30 Balaxman Oy Procedure in a sheet metal work center and a sheet metal work center
DE102007005011B4 (en) * 2007-02-01 2012-09-06 Saeta Gmbh & Co. Kg Method and drawing tool for deep drawing blanks of sheet metal material to flangeless moldings
EP2205373B1 (en) * 2007-10-01 2019-04-24 Inventio AG Deep-drawing device

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Cited By (23)

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Publication number Priority date Publication date Assignee Title
FR2607416A1 (en) * 1986-11-27 1988-06-03 Mueller Weingarten Maschf DEVICE FOR CONTROLLING OR REGULATING THE STRENGTH OF A PRESS-FLAN OF A PRESS, FOR EXAMPLE DURING A BOTTLING OPERATION
GB2197813B (en) * 1986-11-27 1991-07-24 Mueller Weingarten Maschf A mechanical drawing press.
GB2197813A (en) * 1986-11-27 1988-06-02 Mueller Weingarten Maschf Controlling or adjusting blank holder force during a drawing process
DE3717768A1 (en) * 1987-05-26 1988-12-08 Schuler Gmbh L Drawing apparatus in the bed of a press
EP0312809A2 (en) * 1987-10-21 1989-04-26 Daimler-Benz Aktiengesellschaft Double action press for drawing sheet components
EP0312808A2 (en) * 1987-10-21 1989-04-26 Daimler-Benz Aktiengesellschaft Press for drawing sheet components
EP0312808A3 (en) * 1987-10-21 1989-10-18 Daimler-Benz Aktiengesellschaft Press for drawing sheet components
EP0312809A3 (en) * 1987-10-21 1989-10-18 Daimler-Benz Aktiengesellschaft Double action press for drawing sheet components
DE3807683A1 (en) * 1988-03-09 1989-09-21 Schuler Gmbh L Drawing apparatus in drawing stages of presses
US5099673A (en) * 1989-10-10 1992-03-31 L. Schuler Pressen Gmbh Drawing apparatus in drawing stages of presses
US5138857A (en) * 1990-04-23 1992-08-18 Maschinenfabrik Mueller-Weingarten Ag Drawing device in a press for drawing shaped sheet-metal parts
FR2667257A1 (en) * 1990-10-02 1992-04-03 Erfurt Umformtechnik Gmbh HYDRAULIC HOLDER FOR SINGLE-EFFECT PRESSES.
EP0573830A1 (en) * 1992-06-10 1993-12-15 Umformtechnik ERFURT GmbH Hydraulic drawing system in a press
EP0596696A1 (en) * 1992-11-05 1994-05-11 Toyota Jidosha Kabushiki Kaisha Method and device for controlling, checking or optimizing pressure of cushion pin cylinders of press by discharging fluid or initial pressure
US5457980A (en) * 1992-11-05 1995-10-17 Toyota Jidosha Kabushiki Kaisha Method and device for controlling, checking or optimizing pressure of cushion pin cylinders of press by discharging fluid or initial pressure
EP0773075A3 (en) * 1992-11-05 1997-10-15 Toyota Motor Co Ltd Method and device for controlling, checking or optimizing pressure of cushion pin cylinders of press by discharging fluid or initial pressure
US5471861A (en) * 1993-04-28 1995-12-05 Toyota Jidosha Kabushiki Kaisha Method and apparatus for diagnosing press cushioning device, on optimum range of blank-holding force
EP0635320A1 (en) * 1993-07-24 1995-01-25 Umformtechnik ERFURT GmbH Pressure pad for single-acting presses in particular for mechanical and transfer presses
US5701778A (en) * 1994-03-03 1997-12-30 Toyota Jidosha Kabushiki Kaisha Press having gas cylinders of plastically deformable members for even distribution of blank-holding force on pressure member through cushion pins
US5687598A (en) * 1994-07-15 1997-11-18 Toyota Jidosha Kabushiki Kaisha Press having cushioning cylinders each having two chambers whose pressure difference is adjustable to control blank-holding force
EP0713735A1 (en) * 1994-11-23 1996-05-29 Umformtechnik ERFURT GmbH Length compensation means in a clamping device between the upper and lower tool of a press
EP1138406A2 (en) * 2000-03-30 2001-10-04 FAGOR, S.Coop A press with a hydraulic cushion and a system for controlling the force and pad position thereof
EP1138406A3 (en) * 2000-03-30 2003-05-21 FAGOR, S.Coop A press with a hydraulic cushion and a system for controlling the force and pad position thereof

Also Published As

Publication number Publication date
US4601190A (en) 1986-07-22
BR8503119A (en) 1986-03-18
DE3476524D1 (en) 1989-03-09
EP0173755B1 (en) 1989-02-01

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