EP0074421B1 - Deep-drawing arrangement for presses with mechanically driven drawing punch - Google Patents

Deep-drawing arrangement for presses with mechanically driven drawing punch Download PDF

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Publication number
EP0074421B1
EP0074421B1 EP81107203A EP81107203A EP0074421B1 EP 0074421 B1 EP0074421 B1 EP 0074421B1 EP 81107203 A EP81107203 A EP 81107203A EP 81107203 A EP81107203 A EP 81107203A EP 0074421 B1 EP0074421 B1 EP 0074421B1
Authority
EP
European Patent Office
Prior art keywords
piston
ram
sheet metal
cushion
pressure medium
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
Application number
EP81107203A
Other languages
German (de)
French (fr)
Other versions
EP0074421A1 (en
Inventor
Heinz Gerber
Klaus Adam
Heinz Horn
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
Original Assignee
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 EP81107203A priority Critical patent/EP0074421B1/en
Priority to DE8181107203T priority patent/DE3170614D1/en
Priority to JP57502797A priority patent/JPS58501419A/en
Priority to US06/525,906 priority patent/US4499750A/en
Priority to BR8207859A priority patent/BR8207859A/en
Priority to PCT/DE1982/000181 priority patent/WO1983000821A1/en
Publication of EP0074421A1 publication Critical patent/EP0074421A1/en
Application granted granted Critical
Publication of EP0074421B1 publication Critical patent/EP0074421B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders

Definitions

  • the invention relates to a drawing device for presses with a mechanically driven ram and with a sheet metal holder, the holding force acting on the sheet metal, counteracting the drawing direction, is exerted via a pressure plate by means of a drawing cushion piston which supports it and is pressurized with pressure medium in a fixed drawing cushion cylinder.
  • the drawing cushion piston 10 is guided in a drawing cushion cylinder 12 fixed to the frame, in the lower region of which an annular piston 13 surrounding the piston rod 8 is also guided, the movements of which in the drawing direction downward through the end wall of the drawing cushion cylinder 12 and upward through an inner annular collar 14 on the drawing cushion cylinder 12 are limited.
  • a working cycle of the pulling device begins in the - shown in the drawing - initial position, in which a plate 27 rests on the plate holder 5, which is in its highest position, in which it rests against a collar 28 of the lower tool 3 from below.
  • the Ziehstössel24 begins its downward movement.
  • the control acts on the active surface on the top of the piston 9 with pressure medium, so that the piston rod 8 with all the parts attached to it and the sheet holder 5 are accelerated in the drawing direction.
  • the sheet metal holder 5 with the sheet metal 27 lying thereon drops so far that the upper sides of the sheet metal holder 5 and the lower tool 3 are at the same height and the sheet metal 27 rests on the drawing die 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Description

Die Erfindung bezieht sich auf eine Zieheinrichtung für Pressen mit mechanisch angetriebenen Ziehstössel und mit einem Blechhalter, dessen auf das Blech wirkende, der Ziehrichtung entgegenwirkende Haltekraft über eine Druckplatte mittels eines diese abstützenden, druckmittelbeaufschlagten Ziehkissenkolbens in einem feststehenden Ziehkissenzylinder ausgeübt ist.The invention relates to a drawing device for presses with a mechanically driven ram and with a sheet metal holder, the holding force acting on the sheet metal, counteracting the drawing direction, is exerted via a pressure plate by means of a drawing cushion piston which supports it and is pressurized with pressure medium in a fixed drawing cushion cylinder.

Beim Arbeitshub des Ziehstössels einer derartigen Presse wird zunächst das Blech durch den Ziehring gegen den Blechhalter gedrückt und anschliessend zusammen mit diesem entgegen der im Ziehkissenzylinder wirkenden Druckkraft verschoben, wobei gleichzeitig das zwischen Blechhalter und Ziehring festegehaltene Blech durch den Ziehstempel des auf dem Pressentisch feststehenden Werkzeuges verformt wird. Der Ziehstössel verschiebt den Blechhalter gegen die auf den Ziehkissenkolben wirkende Druckkraft, wobei der Ziehstössel auch die Massenträgheitskraft, die durch die Beschleunigung der beweglichen Blechhalter- und Ziehkissenmasse hervorgerufen wird, noch überwinden muss. Der Blechhalter, der sich auf dem Ziehkissenkolben abstützt, bildet nämlich ein starres System mit einer grossen, zusammenhängenden Masse, welche aus der Ruhe schlagartig auf die Auftreffgeschwindigkeit des Ziehstössels beschleunigt werden muss. Wenn die Blechhalterkraft hydraulisch in dem Ziehkissen erzeugt wird, muss auch noch die Massenträgheitskraft der Druckflüssigkeit bei der Beschleunigung des ruhenden Systems überwunden werden.During the working stroke of the ram of such a press, the sheet metal is first pressed against the sheet metal holder by the drawing ring and then moved together with the latter against the compressive force acting in the drawing cushion cylinder, the sheet metal held between the sheet metal holder and the drawing ring being deformed at the same time by the drawing die of the tool fixed on the press table becomes. The drawing plunger moves the sheet metal holder against the pressure force acting on the drawing cushion piston, the drawing plunger also having to overcome the inertia caused by the acceleration of the movable sheet metal holder and die cushion mass. The sheet metal holder, which is supported on the die cushion piston, forms a rigid system with a large, coherent mass, which has to be accelerated suddenly from the rest to the speed of impact of the die rod. If the sheet metal holder force is generated hydraulically in the die cushion, the inertia force of the hydraulic fluid must also be overcome when the stationary system accelerates.

Bei einer bekannten Zieheinrichtung der eingangs genannten Art (DE-PS Nr. 1452943) ist zwischen dem Blechhalter und den beweglichen Massen des Ziehkissens ein federndes Glied angeordnet. Dadurch wird die bewegliche Masse des Ziehkissens zeitlich nach der Masse des Blechhalters beschleunigt, so dass sich die Massenkräfte des gesamten Systems nicht addieren. Das federnde Glied bewirkt eine stetige Geschwindigkeitszunahme des Ziehkissenkolbens bis zur Geschwindigkeit des Ziehstössels. Durch diese stetige Geschwindigkeitszunahme des Ziehkissenkolbens wird die wirksame Massenträgheitskraft des Ziehkissenkolbens verringert. Gleichwohl trifft dabei der Ziehstössel mit seiner in diesem Bewegungsbereich gegebenen Geschwindigkeit auf das in Ruhe befindliche, auf dem Blechhalter liegende Blech auf, so dass sich ein ungedämpfter Auftreffschlag ergibt.In a known drawing device of the type mentioned (DE-PS No. 1452943), a resilient member is arranged between the sheet metal holder and the movable masses of the die cushion. As a result, the movable mass of the die cushion is accelerated in time after the mass of the sheet holder, so that the mass forces of the entire system do not add up. The resilient link causes a constant increase in the speed of the die cushion piston up to the speed of the die ram. This steady increase in speed of the die cushion piston reduces the effective inertia force of the die cushion piston. At the same time, the drawing ram strikes the sheet lying at rest on the sheet metal holder with its speed given in this range of motion, so that there is an undamped impact impact.

Aufgabe der Erfindung ist es, bei einer Zieheinrichtung der eingangs genannten Art diesen Auftreffschlag zu vermeiden oder zumindest zu vermindern.The object of the invention is to avoid or at least reduce this impact impact in a pulling device of the type mentioned at the outset.

Diese Aufgabe ist erfindungsgemäss dadurch gelöst, dass an der Druckplatte ein Kolben mit in Ziehrichtung beaufschlagbarer Wirkfläche befestigt ist, und dass eine stösselwegabhängig arbeitende Steuerung vorgesehen ist, durch die vor dem Aufsetzen des Ziehstössels auf den Blechhalter dieser durch Beaufschlagung der Wirkfläche mit Druckmittel auf eine Bewegung in Ziehrichtung beschleunigbar ist.This object is achieved according to the invention in that a piston with an active surface which can be acted upon in the direction of drawing is fastened to the pressure plate, and in that a control which operates depending on the ram path is provided, by means of which, before the drawing plunger is placed on the sheet metal holder, the pressure is applied to the active surface to cause movement can be accelerated in the direction of pull.

Infolge dieser Massnahmen befindet sich der Blechhalter mit dem darauf liegenden Blech bereits in Bewegung in Ziehrichtung, wenn der Ziehstössel auf das Blech auftrifft; die Relativgeschwindigkeit zwischen Ziehstössel und Blech ist damit geringer als bei einem Auftreffen auf das stillstehende Blech. Der Auftreffschlag wird dadurch gemildert oder ganz vermieden.As a result of these measures, the sheet metal holder with the sheet metal lying thereon is already moving in the direction of drawing when the drawing ram strikes the sheet metal; the relative speed between the ram and the sheet is therefore lower than when it hits the stationary sheet. The impact impact is thereby mitigated or avoided entirely.

Ein besonders einfacher konstruktiver Aufbau der Zieheinrichtung ergibt sich dabei, wenn die Wirkfläche an dem Ziehkissenkolben gebildet ist.A particularly simple structural design of the drawing device is obtained if the active surface is formed on the drawing cushion piston.

Eine besonders feinfühlige Anpassung der Bewegung des Blechhalters an die Bewegung des Ziehstössels lässt sich dadurch erreichen, dass die Steuerung die Beaufschlagung der Wirkfläche mit Druckmittel über ein Proportionalventil beeinflusst.A particularly sensitive adjustment of the movement of the sheet metal holder to the movement of the drawing ram can be achieved in that the control influences the application of pressure medium to the active surface via a proportional valve.

Zweckmässigerweise ist die Bewegung des Blechhalters in Ziehrichtung auf eine Geschwindigkeit beschleunigbar, die gleich der oder wenig kleiner als die Geschwindigkeit des Ziehstössels bei dem Aufsetzen auf den Blechhalter ist.The movement of the sheet metal holder in the drawing direction can expediently be accelerated to a speed which is equal to or slightly less than the speed of the drawing ram when it is placed on the sheet metal holder.

In der Zeichnung ist als Ausführungsbeispiel für die Erfindung eine Zieheinrichtung in einem Vertikalschnitt dargestellt.In the drawing, a pulling device is shown in a vertical section as an exemplary embodiment of the invention.

In einem Untergestell 1 einer- im übrigen in der Zeichnung nicht näher dargestellten - Presse ist auf einem Pressentisch 2 ein Unterwerkzeug 3 mit einem feststehenden Ziehstempel 4 und einem in Ziehrichtung beweglichen Blechhalter 5 angeordnet. Der Blechhalter 5 ist über Druckstifte 6 auf einer Druckplatte 7 abgestützt, die an dem oberen Ende einer Kolbenstange 8 angebracht ist, an der ein Kolben 9 und ein Ziehkissenkolben 10 starr befestigt sind. Der Kolben 9 ist in einem gestellfesten Zylinder 11 geführt und weist eine obere, in Ziehrichtung beaufschlagbare Wirkfläche auf. Der Ziehkissenkolben 10 ist in einem gestellfesten Ziehkissenzylinder 12 geführt, in dessen unterem Bereich zusätzlich ein die Kolbenstange 8 umschliessender Ringkolben 13 geführt ist, dessen Bewegungen in Ziehrichtung nach unten durch die Stirnwand des Ziehkissenzylinders 12 und nach oben durch einen inneren Ringbund 14 an dem Ziehkissenzylinder 12 begrenzt sind.In a base frame 1 of a press, which is not shown in the drawing, a lower tool 3 with a fixed drawing die 4 and a sheet metal holder 5 movable in the drawing direction is arranged on a press table 2. The sheet metal holder 5 is supported via pressure pins 6 on a pressure plate 7, which is attached to the upper end of a piston rod 8, to which a piston 9 and a die cushion piston 10 are rigidly attached. The piston 9 is guided in a cylinder 11 which is fixed to the frame and has an upper active surface which can be acted upon in the drawing direction. The drawing cushion piston 10 is guided in a drawing cushion cylinder 12 fixed to the frame, in the lower region of which an annular piston 13 surrounding the piston rod 8 is also guided, the movements of which in the drawing direction downward through the end wall of the drawing cushion cylinder 12 and upward through an inner annular collar 14 on the drawing cushion cylinder 12 are limited.

An den unter dem Ringkolben 13 in dem Ziehkissenzylinder 12 gebildeten Druckmittelraum ist ein Blasenspeicher 15 angeschlossen. An den unter dem Ziehkissenkolben 10 in dem Ziehkissenzylinder 12 über dem Ringbund 14 gebildeten Druckmittelraum sind eine Druckmittelzuführung 16 über ein Rückschlagventil 17 und eine Druckmittelableitung 18 über ein Druckbegrenzungsventil 19 angeschlossen. An den in dem Zylinder 11 über dem Kolben 9 gebildeten Druckmittelraum ist eine Druckmittelzu- und -abführung über ein schaltbares Ventil 20 angeschlossen. Das Ventil 20 ist über eine Wirkverbindung 21 an eine stösselwegabhängige Steuerung angeschlossen, die aus einem Nockenfolger 22 und einem Nocken 23 besteht, der synchron mit einem - in der Zeichnung nicht dargestellten - mechanischen Antrieb für einen Ziehstössel 24 umläuft. Der Ziehstössel 24 trägt auf seiner Unterseite einen dem Blechhalter 5 gegenüberliegenden Ziehring 25 und einen dem Ziehstempel 4 gegenüberliegenden Auswerfer 26.A bladder accumulator 15 is connected to the pressure medium space formed under the annular piston 13 in the die cushion cylinder 12. A pressure medium supply 16 via a check valve 17 and a pressure medium discharge line 18 via a pressure relief valve 19 are connected to the pressure medium space formed under the drawing cushion piston 10 in the drawing cushion cylinder 12 above the annular collar 14. A pressure medium supply and discharge is connected to the pressure medium space formed in the cylinder 11 above the piston 9 via a switchable valve 20. The valve 20 is connected via an operative connection 21 to a control which is dependent on the ram and consists of a cam follower 22 and a cam 23 which rotates synchronously with a mechanical drive (not shown in the drawing) for a drawing ram 24. The ram 24 carries on its underside a drawing ring 25 opposite the sheet metal holder 5 and an ejector 26 opposite the drawing punch 4.

Ein Arbeitszyklus der Zieheinrichtung beginnt in der - in der Zeichnung dargestellten - Anfangsstellung, bei der ein Blech 27 auf dem Blechhalter 5 aufliegt, der sich in seiner höchsten Lage befindet, in der er von unten an einem Bund 28 des Unterwerkzeuges 3 anliegt. Der Ziehstössel24 beginnt seine Bewegung nach unten. Vor dem Auftreffen des Ziehringes 25 auf das Blech 27 bewirkt die Steuerung eine Beaufschlagung der Wirkfläche auf der Oberseite des Kolbens 9 mit Druckmittel, so dass die Kolbenstange 8 mit allen daran befestigten Teilen und der Blechhalter 5 in Ziehrichtung beschleunigt werden. Während dieser Beschleunigung sinkt der Blechhalter 5 mit dem darauf liegenden Blech 27 so weit ab, dass die Oberseiten des Blechhalters 5 und des Unterwerkzeuges 3 auf gleicher Höhe liegen und das Blech 27 auf dem Ziehstempel 4 aufliegt. Bis dahin hat auch der sich schneller in Ziehrichtung bewegende Ziehstössel 24 mit dem Ziehring 25 die Oberseite des Bleches 27 erreicht. Während der Beschleunigung hat ausserdem das in dem Druckmittelraum unter dem Ziehkissenkolben 10 eingeschlossene Druckmittel den Ringkolben 13 um dessen Hub 29 bis zur Anlage an der unteren Stirnwand des Ziehkissenkolbens 12 verschoben. Der Hub 29 ist gleich dem Mass, um das der Blechhalter 5 in seiner höchsten Lage mit seiner Oberseite über die Oberseite des Unterwerkzeuges 3 vorragt. M it dem Aufsetzen des Ziehringes 25 auf das Blech 27 und dem Anlaufen des Ringkolbens 13 an der unteren Stirnwand des Ziehkissenzylinders 12 beginnt die Zieheinrichtung in üblicher Weise als hydraulische Zieheinrichtung zu arbeiten. Nach beendetem Ziehhub kehrt die Zieheinrichtung in die - in der Zeichnung dargestellte - Anfangsstellung zurück.A working cycle of the pulling device begins in the - shown in the drawing - initial position, in which a plate 27 rests on the plate holder 5, which is in its highest position, in which it rests against a collar 28 of the lower tool 3 from below. The Ziehstössel24 begins its downward movement. Before the impact of the drawing ring 25 on the sheet 27, the control acts on the active surface on the top of the piston 9 with pressure medium, so that the piston rod 8 with all the parts attached to it and the sheet holder 5 are accelerated in the drawing direction. During this acceleration, the sheet metal holder 5 with the sheet metal 27 lying thereon drops so far that the upper sides of the sheet metal holder 5 and the lower tool 3 are at the same height and the sheet metal 27 rests on the drawing die 4. In the meantime, the drawing plunger 24 with the drawing ring 25, which moves faster in the drawing direction, has reached the top of the sheet 27. During the acceleration, the pressure medium enclosed in the pressure medium space under the die cushion piston 10 has also displaced the annular piston 13 by its stroke 29 until it abuts the lower end wall of the die cushion piston 12. The stroke 29 is equal to the amount by which the sheet metal holder 5 projects in its highest position with its upper side above the upper side of the lower tool 3. With the placement of the drawing ring 25 on the sheet 27 and the start of the annular piston 13 on the lower end wall of the drawing cushion cylinder 12, the drawing device begins to work in the usual manner as a hydraulic drawing device. After the drawing stroke has ended, the drawing device returns to the starting position shown in the drawing.

Claims (4)

1. Drawing mechanism for presses having a mechanically driven drawing ram (24) and a blank holder (5) whose holding force acting on the blank (27) oppositely to the drawing direction is exerted via a pressure plate (7) with the aid of a drawing cushion piston (10) which supports said pressure plate and is loaded by pressure medium and which is disposed in a stationary drawing cushion cylinder (12), characterized in that a piston (9) having an operative surface adapted to be loaded in the drawing direction is fastened on the pressure plate (7), and that a control means (22, 23) is provided which works in dependence on the travel of the ram and by which the blank holder (5), before the drawing ram (24) contacts it, is adapted to be accelerated into a movement in the drawing direction through the loading of the operative surface with pressure medium.
2. Drawing mechanism according to Claim 1, characterized in that the operative surface is formed on the drawing cushion piston (10) in the drawing cushion cylinder (12).
3. Drawing mechanism according to Claim 1 or 2, characterized in that the control means (22, 23) controls the loading of the operative surface with pressure medium with the aid of a proportional valve.
4. Drawing mechanism according to Claim 1, 2 or 3, characterized in that the movement of the blank holder (5) in the drawing direction can be accelerated to a speed equal to or slightly lower than the speed of the drawing ram (24) when it makes contact with the blank holder (5).
EP81107203A 1981-09-12 1981-09-12 Deep-drawing arrangement for presses with mechanically driven drawing punch Expired EP0074421B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP81107203A EP0074421B1 (en) 1981-09-12 1981-09-12 Deep-drawing arrangement for presses with mechanically driven drawing punch
DE8181107203T DE3170614D1 (en) 1981-09-12 1981-09-12 Deep-drawing arrangement for presses with mechanically driven drawing punch
JP57502797A JPS58501419A (en) 1981-09-12 1982-09-07 Press drawing device with mechanically driven punches
US06/525,906 US4499750A (en) 1981-09-12 1982-09-07 Drawing device for presses with mechanically driven drawing ram
BR8207859A BR8207859A (en) 1981-09-12 1982-09-07 BUILT-IN INSTALLATION FOR PRESSES WITH MECHANICALLY ACTIVATED BUILT-IN PUNCH HOLDER
PCT/DE1982/000181 WO1983000821A1 (en) 1981-09-12 1982-09-07 Drawing device for presses, provided with a mechanically operated punch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81107203A EP0074421B1 (en) 1981-09-12 1981-09-12 Deep-drawing arrangement for presses with mechanically driven drawing punch

Publications (2)

Publication Number Publication Date
EP0074421A1 EP0074421A1 (en) 1983-03-23
EP0074421B1 true EP0074421B1 (en) 1985-05-22

Family

ID=8187905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107203A Expired EP0074421B1 (en) 1981-09-12 1981-09-12 Deep-drawing arrangement for presses with mechanically driven drawing punch

Country Status (6)

Country Link
US (1) US4499750A (en)
EP (1) EP0074421B1 (en)
JP (1) JPS58501419A (en)
BR (1) BR8207859A (en)
DE (1) DE3170614D1 (en)
WO (1) WO1983000821A1 (en)

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DE3807683A1 (en) * 1988-03-09 1989-09-21 Schuler Gmbh L Drawing apparatus in drawing stages of presses
DE4034518A1 (en) * 1989-10-30 1991-05-08 Teledyne Ind PRESS ARRANGEMENT AND OPERATING PROCEDURE
DE10055761B4 (en) * 1999-11-12 2008-04-10 Komatsu Ltd. Hydraulic pressure compensation method and hydraulic pressure compensation device for pressure bolts

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Also Published As

Publication number Publication date
WO1983000821A1 (en) 1983-03-17
EP0074421A1 (en) 1983-03-23
JPH0422649B2 (en) 1992-04-20
JPS58501419A (en) 1983-08-25
BR8207859A (en) 1983-08-30
US4499750A (en) 1985-02-19
DE3170614D1 (en) 1985-06-27

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