EP0422491B1 - Drawing device in drawing stages of presses - Google Patents

Drawing device in drawing stages of presses Download PDF

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Publication number
EP0422491B1
EP0422491B1 EP90118941A EP90118941A EP0422491B1 EP 0422491 B1 EP0422491 B1 EP 0422491B1 EP 90118941 A EP90118941 A EP 90118941A EP 90118941 A EP90118941 A EP 90118941A EP 0422491 B1 EP0422491 B1 EP 0422491B1
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EP
European Patent Office
Prior art keywords
pressure
cylinder
bridge
cylinders
blocking
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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
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EP90118941A
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German (de)
French (fr)
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EP0422491A1 (en
Inventor
Siegfried Baur
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L Schuler GmbH
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L Schuler GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically

Definitions

  • the invention relates to drawing apparatuses in presses, with a pressure cheek for sheet metal holding during drawing, with pressure cylinders acting on the sheet metal holder in the tools via the pressure cheek, the pressure of which can be adjusted separately via control means, and with locking cylinders for controlled raising of the sheet metal holder after the drawing.
  • Drawers are used to generate sheet metal holding forces during forming (pulling) and ejector movement (bringing up) the drawn part from the tool of a press.
  • the sheet metal holding forces or counter holding forces during drawing are applied by pressure cylinders, the pressure of which can be adjusted separately to the drawing requirements, avoidance of cracks and wrinkling.
  • the ejector movement for bringing up the molded part is controlled by locking cylinders.
  • the starting position for the start of drawing should be controllable, and the bottom dead center for the drawing device should be adjustable to the tool requirements.
  • Each of the segments of the pressure cheek can be sensitively adjusted to the requirements of drawing in partial areas of the drawn part.
  • the console common to all piston rods or all pressure rods enables joint control of the run-up movement of all pressure rods.
  • the valve control according to claim 2 enables exact maintenance of the predetermined locking point of the ejector movement.
  • the pressure cheek 3 consists of segments 4 and is mounted in the press table 1 so that it can be raised and lowered.
  • the segments 4 are connected to one another via ball or similar joints 7.
  • stops 46 are provided, which overlap each other.
  • the drawing apparatus indicated as a whole by 2, has a cylinder bridge 8 which is fastened in the press table 1.
  • the drawing cylinders 9 engage via a push rod 10 in the extension of the piston rods below on a bracket 5.
  • the console 5 is placed on the segments 4 via push rods with ball or similar joints 6.
  • the console 5 can be raised and lowered with the movement of the push rods 10 and can be locked by the locking cylinders 14 and their piston rods in the run-up movement.
  • the locking cylinders 14 cooperate with a lifting bridge 12.
  • this forms an assembly with the bracket 5 and the segments 4, which allows the segments 4 to move relative to one another essentially in the direction of pressure of the segments 4.
  • the locking cylinders 14 engage in the center of the bracket 5 and on both sides to the pre-acceleration cylinder 11.
  • the pre-acceleration cylinder 11 acts in the pulling direction on the lifting bridge 12 and thus brings about a downward movement of the segments 4 and the sheet metal holder in the tool shortly before the upper part of the tool hits the drawn part.
  • Fig. 3 shows with the cylinder bridge 8 and the lifting bridge 12 the special arrangement of the pre-acceleration cylinder 11 and one of e.g. two locking cylinders 14.
  • the second locking cylinder is indicated at 14 '.
  • the locking cylinders 14 have a pressure chamber 47 (FIG. 5) which is closed at the bottom by a piston 15.
  • a spindle 22 can be guided from below against the piston 15, which spindle can be screwed upwards out of the lifting bridge 12 in a threaded bushing 23 and screwed downwards into the latter.
  • the distance 48 which can be set between the spindle 22 and the piston 15 by adjusting the spindle 22 determines the point in time at which the run-up of the drawing apparatus is interrupted (36 in FIG. 4).
  • the upper part of the spindle 22 interacts with a hub 18 via a longitudinal groove-key connection 20.
  • the hub 18 is rotatably supported in a bearing on the piston insert 16.
  • the hub 18 and thus the threaded spindle 22 are in rotary connection via a gear pair 19 with an adjusting means 21.
  • the piston of the pre-acceleration cylinder 11 forms a threaded bushing 30 in the center of the lifting bridge 12 rotatably mounted threaded spindle 29 an earlier or later entrainment of the lifting bridge 12 when the pre-acceleration cylinder 11 is acted upon Adjustment means 24 in rotary connection.
  • the diagram in FIG. 4 shows with curve 31 the movement course of the ram - stroke over time or angle of rotation -.
  • the bottom dead center of the movement of the ram of the press is indicated, which is also the bottom dead center of the drawing apparatus in this diagram.
  • the bottom dead center of the drawing apparatus is reached simultaneously with the dead center of the ram; however, the height of the dead center position can vary.
  • 32 shows a high position of the pressure cheek 3 or its segments 4.
  • the application of the pre-acceleration cylinder 11 causes the segments 4 to be lowered in the area 34 before the upper tool part hits the drawn part.
  • the valve 38 shown in FIG. 5 is switched open.
  • the pressure spaces 47 of the locking cylinder 14 are connected to a low pressure source 40.
  • the pressure chamber 47 which decreases in the run-up phase 37, fills with hydraulic oil.
  • the valve 39 In order to effect the stop phase 36 of the drawing apparatus, the valve 39 must be opened at a point in time, which is indicated at 44 in FIG. 4.
  • the pressure spaces 47 of the locking cylinders 14 are connected to a high-pressure source 41.
  • the valve 38 can be closed at this time will. Further means known per se, also from the application, for constant pressure and for avoiding pressure setbacks are not shown in FIG. 5.
  • the valve 42 is used to control the drawing apparatus in the run-up phase 37.
  • the pressure chambers 47 are connected to an oil drain 43.

Description

Die Erfindung betrifft Ziehapparate in Pressen, mit einer Druckwange zur Blechhaltung beim Ziehen, mit über die Druckwange auf Blechhalter in den Werkzeugen wirkende Druckzylinder, deren Druck separat über Steuermittel einstellbar ist, und mit Sperrzylindern für ein gesteuertes Hochbringen des Blechhalters nach dem Ziehen.The invention relates to drawing apparatuses in presses, with a pressure cheek for sheet metal holding during drawing, with pressure cylinders acting on the sheet metal holder in the tools via the pressure cheek, the pressure of which can be adjusted separately via control means, and with locking cylinders for controlled raising of the sheet metal holder after the drawing.

Ziehapparate dienen der Erzeugung der Blechhaltekräfte während der Umformung (Ziehen) und der Auswerferbewegung (Hochbringen) des Ziehteils aus dem Werkzeug einer Presse. Die Blechhaltekräfte bzw. Gegenhaltekräfte beim Ziehen werden von Druckzylindern aufgebracht, deren Druck separat auf die Zieherfordernisse, Vermeidung von Rissen und Faltenbildung, einstellbar ist. Die Auswerferbewegung für das Hochbringen des geformten Ziehteils wird über Sperrzylinder gesteuert.Drawers are used to generate sheet metal holding forces during forming (pulling) and ejector movement (bringing up) the drawn part from the tool of a press. The sheet metal holding forces or counter holding forces during drawing are applied by pressure cylinders, the pressure of which can be adjusted separately to the drawing requirements, avoidance of cracks and wrinkling. The ejector movement for bringing up the molded part is controlled by locking cylinders.

Aus der EP 0 173 755 A1 ist es bekannt, die Blechhaltekräfte in den verschiedenen Andruckbereichen vor und während der Umformung anzupassen. Aus der DE 35 05 984 A1 ist es bei einem Ziehapparat bekannt, die Auswerferbewegung des Blechhalters zeitverzögert auf die Hochlaufbewegung des Stößels und die Geschwindigkeit der Auswerferbewegung zu steuern. Aus der DE 38 07 683 A1 sind zudem noch weitere Steuerungsmaßnahmen für den Blechhalter bekannt. So dient beispielsweise die Bewegung und der Stopp eines Druckzylinderkolbens der Bewegungsbegrenzung des Kolbens eines weiteren Druckzylinders, hier eines Ziehzylinders. Weiterhin zeigt diese Druckschrift eine geteilte Druckwange, deren Segmente einzeln druckbeaufschlagbar sind.It is known from EP 0 173 755 A1 to adapt the sheet metal holding forces in the various pressure areas before and during the forming. From DE 35 05 984 A1 it is known in a drawing apparatus to control the ejector movement of the sheet metal holder with a time delay on the run-up movement of the ram and the speed of the ejector movement. Further control measures for the sheet metal holder are also known from DE 38 07 683 A1. For example, the movement and stopping of a pressure cylinder piston serve to limit the movement of the piston of another pressure cylinder, here a drawing cylinder. Furthermore, this document shows a divided pressure cheek, the segments of which can be pressurized individually.

Aus der DE 28 06 528 B 2 ist zwar eine Einrichtung zur mechanischen Höheneinstellung von vier Druckpunkten eines Blechhalters bekannt. Die Aufgabe nach der Erfindung wird durch diese Maßnahme bei gattungsgemäßen Ziehapparaten jedoch nicht gelöst.From DE 28 06 528 B 2 a device for mechanical height adjustment of four pressure points of a sheet metal holder is known. The object according to the invention is not achieved by this measure in the case of generic drawing apparatuses.

Es ist Aufgabe der Erfindung, die Auswerferbewegung der Druckzylinder in einer gezielt vorgebbaren Stellung, z.B. nach 10 mm zu unterbrechen und die Hochbringerbewegung für die Druckwange zu einem späteren, zeitlich verzögerten Augenblick erneut aufzunehmen. Hierbei soll einerseits die Ausgangslage für den Ziehbeginn steuerbar, als auch der untere Totpunkt für den Ziehapparat auf die Werkzeugerfordernisse einstellbar sein.It is an object of the invention to control the ejector movement of the printing cylinders in a position which can be predetermined in a targeted manner, e.g. after 10 mm and interrupt the movement of the bringer for the pressure cheek at a later, delayed moment. On the one hand, the starting position for the start of drawing should be controllable, and the bottom dead center for the drawing device should be adjustable to the tool requirements.

Die Aufgabe ist gelöst bei einem Ziehapparat gattungsgemäßer Art durch die kennzeichnenden Merkmale von Anspruch 1.The object is achieved in a drawing apparatus of the generic type by the characterizing features of claim 1.

Jedes der Segmente der Druckwange ist feinfühlig auf die Erfordernisse des Ziehens in Teilbereichen des Ziehteils einstellbar. Die allen Kolbenstangen bzw. allen Druckstangen gemeinsame Konsole ermöglicht eine gemeinsame Steuerung der Hochlaufbewegung aller Druckstangen. Die Ventilsteuerung gemäß Anspruch 2 ermöglicht eine exakte Einhaltung des vorbestimmten Rastpunktes der Auswerferbewegung.Each of the segments of the pressure cheek can be sensitively adjusted to the requirements of drawing in partial areas of the drawn part. The console common to all piston rods or all pressure rods enables joint control of the run-up movement of all pressure rods. The valve control according to claim 2 enables exact maintenance of the predetermined locking point of the ejector movement.

Die Merkmale der weiteren Ansprüche kennzeichnen vorteilhafte und für sich erfinderische Ausgestaltungen.The features of the further claims characterize advantageous and inventive developments.

Anhand eines Ausführungsbeispiels soll im folgenden die Erfindung näher erläutert werden. Dabei zeigen

Fig. 1
einen Ziehapparat nach der Erfindung in teilweise geschnittener Ansicht,
Fig. 2
eine Ansicht auf die geteilte Druckwange in dem Ziehapparat nach Fig. 1,
Fig. 3
einen Ausschnitt aus Fig. 1 mit Sperrvorrichtung und Hubeinstellung,
Fig. 4
in einem Diagramm die Stößel- und Ziehapparatbewegungen und
Fig. 5
eine Hydraulikschaltung für die Sperrzylinder.
The invention will be explained in more detail below using an exemplary embodiment. Show
Fig. 1
a drawing apparatus according to the invention in a partially sectioned view,
Fig. 2
2 shows a view of the split pressure cheek in the drawing apparatus according to FIG. 1,
Fig. 3
1 with a locking device and stroke adjustment,
Fig. 4
the plunger and puller movements and
Fig. 5
a hydraulic circuit for the locking cylinder.

Die Druckwange 3 besteht aus Segmenten 4 und ist in dem Pressentisch 1 heb- und senkbar gelagert. Die Segmente 4 sind untereinander über Kugel- od. dgl. Gelenke 7 verbunden. Hierfür sind einander unterfassende Anschläge 46 vorgesehen. Der insgesamt mit 2 angedeutete Ziehapparat weist eine Zylinderbrücke 8 auf, die in dem Pressentisch 1 befestigt ist. An der Zylinderbrücke 8 sind Ziehzylinder 9, ein Vorbeschleunigungszylinder 11 und Sperrzylinder 14 angeordnet. Die Ziehzylinder 9 greifen über Druckstangen 10 in der Verlängerung der Kolbenstangen unterhalb an einer Konsole 5 an. Die Konsole 5 ist über Druckstangen mit Kugel- od. dgl. Gelenken 6 an die Segmente 4 gelegt. Die Konsole 5 ist mit der Bewegung der Druckstangen 10 heb- und senkbar sowie von den Sperrzylindern 14 und deren Kolbenstangen in der Hochlaufbewegung sperrbar. Die Sperrzylinder 14 wirken hierfür mit einer Hubbrücke 12 zusammen. Diese bildet vermittels Spannbolzen 13 mit der Konsole 5 und den Segmenten 4 eine Baugruppe, die eine gegenseitige Bewegung der Segmente 4 im wesentlichen in Druckrichtung der Segmente 4 untereinander zuläßt.The pressure cheek 3 consists of segments 4 and is mounted in the press table 1 so that it can be raised and lowered. The segments 4 are connected to one another via ball or similar joints 7. For this purpose, stops 46 are provided, which overlap each other. The drawing apparatus, indicated as a whole by 2, has a cylinder bridge 8 which is fastened in the press table 1. On the cylinder bridge 8 there are drawing cylinders 9, a pre-acceleration cylinder 11 and locking cylinder 14 arranged. The drawing cylinders 9 engage via a push rod 10 in the extension of the piston rods below on a bracket 5. The console 5 is placed on the segments 4 via push rods with ball or similar joints 6. The console 5 can be raised and lowered with the movement of the push rods 10 and can be locked by the locking cylinders 14 and their piston rods in the run-up movement. For this purpose, the locking cylinders 14 cooperate with a lifting bridge 12. By means of clamping bolts 13, this forms an assembly with the bracket 5 and the segments 4, which allows the segments 4 to move relative to one another essentially in the direction of pressure of the segments 4.

Fig. 2 zeigt den Angriff der von den Ziehzylindern 9 beaufschlagten Druckstangen 10 über die Kugel- od. dgl. Gelenke 6 in den Eckbereichen 45 der Segmente 4. Die Sperrzylinder 14 greifen mittig zur Konsole 5 und beidseitig zu dem Vorbeschleunigungszylinder 11 an. Der Vorbeschleunigungszylinder 11 wirkt in Ziehrichtung auf die Hubbrücke 12 und bewirkt somit eine Abwärtsbewegung der Segmente 4 und des Blechhalters im Werkzeug kurz vor dem Auftreffen des Werkzeugoberteils auf das Ziehteil.2 shows the attack of the push rods 10 acted upon by the drawing cylinders 9 via the ball or similar joints 6 in the corner regions 45 of the segments 4. The locking cylinders 14 engage in the center of the bracket 5 and on both sides to the pre-acceleration cylinder 11. The pre-acceleration cylinder 11 acts in the pulling direction on the lifting bridge 12 and thus brings about a downward movement of the segments 4 and the sheet metal holder in the tool shortly before the upper part of the tool hits the drawn part.

Fig. 3 zeigt mit der Zylinderbrücke 8 und der Hubbrücke 12 die besondere Anordnung des Vorbeschleunigungszylinders 11 und eines von z.B. zwei Sperrzylindern 14. Der zweite Sperrzylinder ist mit 14' angedeutet. Die Sperrzylinder 14 weisen einen Druckraum 47 (Fig. 5) auf, der nach unten von einem Kolben 15 abgeschlossen ist. Gegen den Kolben 15 ist von unten eine Spindel 22 führbar, die in einer Gewindebuchse 23 in der Hubbrücke 12 nach oben aus dieser heraus schraubbar und nach unten in diese hinein schraubbar ist. Der zwischen Spindel 22 und Kolben 15 vermittels Verstellung der Spindel 22 einstellbare Abstand 48 bestimmt den Zeitpunkt, in dem der Hochlauf des Ziehapparats unterbrochen wird (36 in Fig. 4). Der obere Teil der Spindel 22 wirkt über eine Längsnut-Paßfederverbindung 20 mit einer Nabe 18 zusammen. Die Nabe 18 ist in einem Lager an dem Kolbeneinsatz 16 drehbar gelagert. Die Nabe 18 und somit die Gewindespindel 22 stehen über eine Zahnradpaarung 19 mit einem Stellmittel 21 in Drehverbindung.Fig. 3 shows with the cylinder bridge 8 and the lifting bridge 12 the special arrangement of the pre-acceleration cylinder 11 and one of e.g. two locking cylinders 14. The second locking cylinder is indicated at 14 '. The locking cylinders 14 have a pressure chamber 47 (FIG. 5) which is closed at the bottom by a piston 15. A spindle 22 can be guided from below against the piston 15, which spindle can be screwed upwards out of the lifting bridge 12 in a threaded bushing 23 and screwed downwards into the latter. The distance 48 which can be set between the spindle 22 and the piston 15 by adjusting the spindle 22 determines the point in time at which the run-up of the drawing apparatus is interrupted (36 in FIG. 4). The upper part of the spindle 22 interacts with a hub 18 via a longitudinal groove-key connection 20. The hub 18 is rotatably supported in a bearing on the piston insert 16. The hub 18 and thus the threaded spindle 22 are in rotary connection via a gear pair 19 with an adjusting means 21.

In gleicher Weise bildet der Kolben des Vorbeschleunigungszylinders 11 mit einer mittig zur Hubbrücke 12 in einer Gewindebuchse 30 drehgelagerten Gewindespindel 29 eine frühere oder spätere Mitnahme der Hubbrücke 12 bei Beaufschlagung des Vorbeschleunigungszylinders 11. Die Spindel 29 ist über eine Längsnut-Paßfederverbindung 28 in ihrem oberen Teil mit einer in einem Lager 26 an dem Vorbeschleunigungszylinder 11 gelagerten Nabe 27 und eine Zahnradpaarung 25 mit einem Stellmittel 24 in Drehverbindung.In the same way, the piston of the pre-acceleration cylinder 11 forms a threaded bushing 30 in the center of the lifting bridge 12 rotatably mounted threaded spindle 29 an earlier or later entrainment of the lifting bridge 12 when the pre-acceleration cylinder 11 is acted upon Adjustment means 24 in rotary connection.

Das Diagramm in Fig. 4 zeigt mit der Kurve 31 den Bewegungsverlauf des Stößels - Hub über der Zeit bzw. Drehwinkel -. Mit 35 ist der untere Totpunkt der Bewegung des Stößels der Presse angegeben, der in diesem Diagramm auch der untere Totpunkt des Ziehapparats ist. Entsprechend den Werkzeugdimensionen (Höhenmaße) und der Verwendung unterschiedlich langer Druckbolzen zwischen den Segmenten 4 und dem Blechhalter oder den Blechhaltern in einem auf dem Pressentisch 1 aufgesetzten Werkzeug wird der untere Totpunkt des Ziehapparats zwar zeitgleich mit dem Totpunkt des Stößels erreicht; die Höhe der Totpunktlage kann jedoch variieren. Mit 32 ist eine Hochlage der Druckwange 3 bzw. deren Segmente 4 dargestellt. Die Beaufschlagung des Vorbeschleunigungszylinders 11 bewirkt eine Absenkung der Segmente 4 im Bereich 34 vor dem Auftreffen des Werkzeugoberteils auf dem Ziehteil. Das Herausschrauben der Spindel 29 aus der Hubbrücke 12 in Fig. 3 nach oben führt zu einer Hochlage, die z.B. durch Position 33 in Fig. 4 angedeutet wurde. Mit 34' ist wiederum die Vorbeschleunigung der Segmente 4 angedeutet. Um den Ziehapparat mit den Segmenten 4 in der Hochlaufbewegung 37 zu unterbrechen, sind die in Fig. 5 gezeigten Ventile 38 und 39 entsprechend zu beaufschlagen. Mit 36 ist eine Halt-Phase des Ziehapparats dargestellt, um das Ziehteil, nachdem es aus der Form des Werkzeugs ausgehoben worden ist, dem Werkzeug zu entnehmen.The diagram in FIG. 4 shows with curve 31 the movement course of the ram - stroke over time or angle of rotation -. With 35 the bottom dead center of the movement of the ram of the press is indicated, which is also the bottom dead center of the drawing apparatus in this diagram. Corresponding to the tool dimensions (height dimensions) and the use of pressure bolts of different lengths between the segments 4 and the sheet metal holder or the sheet metal holders in a tool placed on the press table 1, the bottom dead center of the drawing apparatus is reached simultaneously with the dead center of the ram; however, the height of the dead center position can vary. 32 shows a high position of the pressure cheek 3 or its segments 4. The application of the pre-acceleration cylinder 11 causes the segments 4 to be lowered in the area 34 before the upper tool part hits the drawn part. Unscrewing the spindle 29 from the lifting bridge 12 in Fig. 3 upwards leads to a high position, e.g. was indicated by position 33 in Fig. 4. The pre-acceleration of the segments 4 is again indicated by 34 '. In order to interrupt the drawing apparatus with the segments 4 in the run-up movement 37, the valves 38 and 39 shown in FIG. 5 must be acted upon accordingly. 36 shows a stop phase of the drawing apparatus in order to remove the drawing part from the tool after it has been lifted out of the shape of the tool.

In der Ziehphase ist das in Fig. 5 gezeigte Ventil 38 offen geschaltet. Dadurch sind die Druckräume 47 des Sperrzylinders 14 mit einer Niederdruckquelle 40 verbunden. Hierdurch füllt sich der in der Hochlaufphase 37 sich verkleinernde Druckraum 47 mit Hydrauliklöl. Um nun die Halt-Phase 36 des Ziehapparats zu bewirken, ist zu einem Zeitpunkt, der mit 44 in Fig. 4 angedeutet ist, das Ventil 39 zu öffnen. Dadurch sind die Druckräume 47 der Sperrzylinder 14 mit einer Hochdruckquelle 41 verbunden. Das Ventil 38 kann zu diesem Zeitpunkt geschlossen werden. Weitere, an sich auch von der Anwendung her bekannte Mittel zur Druckkonstanz und zur Vermeidung von Druckrückschlägen sind in Fig. 5 nicht dargestellt. Das Ventil 42 dient der Steuerung des Ziehapparats in der Hochlaufphase 37. Hierbei werden die Druckräume 47 mit einem Ölablaß 43 verbunden.In the drawing phase, the valve 38 shown in FIG. 5 is switched open. As a result, the pressure spaces 47 of the locking cylinder 14 are connected to a low pressure source 40. As a result, the pressure chamber 47, which decreases in the run-up phase 37, fills with hydraulic oil. In order to effect the stop phase 36 of the drawing apparatus, the valve 39 must be opened at a point in time, which is indicated at 44 in FIG. 4. As a result, the pressure spaces 47 of the locking cylinders 14 are connected to a high-pressure source 41. The valve 38 can be closed at this time will. Further means known per se, also from the application, for constant pressure and for avoiding pressure setbacks are not shown in FIG. 5. The valve 42 is used to control the drawing apparatus in the run-up phase 37. The pressure chambers 47 are connected to an oil drain 43.

Claims (5)

  1. Drawing apparatus (2) in drawing stages of presses, having a pressure side-piece (3) for holding the metal sheet during drawing, having pressure cylinders (9) which act via the pressure side-piece (3) on sheet holders in the tools and whose pressure is separately adjustable via control means, and having blocking cylinders (14) for controlled raising of the sheet holder after drawing, characterised in that the pressure side-piece (3) is divided into segments (4) which can be placed individually and also jointly against the sheet holder or sheet holders, in that a pressure cylinder (9) engages at least in the corner regions (45) of each of the segments (4), in that the pressure cylinders (9) are arranged so as to be fixed to the press and the piston rods or pressure rods (10), on which said pressure cylinders act, are rigidly connected to one another in the continuation of the piston rods via a raisable and lowerable bracket (5) which is common to all the pressure rods (10), and in that at least one blocking cylinder (14), which is fixed to the frame, acts on the bracket (5), the blocking (pressure) space (47) of which blocking cylinder can be brought into flow connection with a pressure source (40, 41) or with an oil outlet (43) by means of valves (38, 39, 42) as a function of the ram movement (31).
  2. Drawing apparatus according to Claim 1, characterised in that the blocking (pressure) space (47) of the blocking cylinder (14), the blocking spaces (47) when a plurality of blocking cylinders (14) are used, can be connected by means of valve control (38, 39) on the one hand to a pressure source (40) for a high flow volume and, on the other hand, to a pressure source (41) for a high pressure.
  3. Drawing apparatus according to Claim 1, characterised by a cylinder bridge (8) which is fixed to the press and on which the drawing cylinders (9) and blocking cylinders (14) are firmly mounted, by a bracket (5) which is arranged below the segments (4) and is raisable and lowerable with said segments, and on which the drawing cylinders (9) act via pressure rods (10), by a lifting bridge (12) below the cylinder bridge (8) which is raisable and lowerable by means of clamping bolts (13) with the segments (4) and the bracket (5), and by a spindle (29) which is mounted rotatably in a threaded bush (30), attached in the lifting bridge (12), and is adjustable by an adjusting means (24) for unscrewing from the lifting bridge (12) or screwing into the latter up to the stop on the cylinder bridge (8).
  4. Drawing apparatus according to Claim 1, characterised by a further pressure cylinder (11) for the preliminary acceleration of the pressure side-piece (3, 4), the bracket (5) and the bridge part (12) in the drawing direction, it being possible for the first spindle (29) to be placed from below against the piston or the piston rod of the pressure cylinder (11).
  5. Drawing apparatus according to Claim 4, characterised by a cylinder bridge (8) which is fixed to the press and on which the drawing cylinders (9) and blocking cylinders (14) are firmly mounted, by a bracket (5) which is arranged below the segments (4) and is raisable and lowerable with said segments, and on which the drawing cylinders (9) act via pressure rods (10), by a lifting bridge (12) below the cylinder bridge (8) which is raisable and lowerable by means of clamping bolts (13) with the segments (4) and the bracket (5), and by a first spindle (29) which, in a threaded bush (30), attached in the lifting bridge (12), can be unscrewed from the lifting bridge (12) by adjusting means (24) and can be screwed into said lifting bridge up to the stop on the cylinder bridge (8), and by a second spindle per blocking cylinder (14), which spindle, in a threaded bush (23), attached in the lifting bridge (12), can be unscrewed from the lifting bridge (12) by adjusting means (21) and can be screwed into said lifting bridge, and which can be operatively connected from below to the piston (15) of the preliminary acceleration cylinder (14).
EP90118941A 1989-10-10 1990-10-04 Drawing device in drawing stages of presses Expired - Lifetime EP0422491B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3933806 1989-10-10
DE3933806A DE3933806A1 (en) 1989-10-10 1989-10-10 DRAWER IN DRAWING STAGES OF PRESSES

Publications (2)

Publication Number Publication Date
EP0422491A1 EP0422491A1 (en) 1991-04-17
EP0422491B1 true EP0422491B1 (en) 1993-06-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118941A Expired - Lifetime EP0422491B1 (en) 1989-10-10 1990-10-04 Drawing device in drawing stages of presses

Country Status (6)

Country Link
US (1) US5099673A (en)
EP (1) EP0422491B1 (en)
CA (1) CA2027101C (en)
DE (2) DE3933806A1 (en)
ES (1) ES2042168T3 (en)
RU (1) RU1829977C (en)

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DE4117102A1 (en) * 1991-05-25 1992-11-26 Schuler Gmbh L PRESS WITH DRAWING DEVICE
US5799532A (en) * 1996-05-21 1998-09-01 Lewis; Ronald O. Fully contained self adjusting nitrogen binder plate
DE19639222A1 (en) * 1996-09-25 1998-04-02 Erfurt Umformtechnik Gmbh Cushion pre-acceleration device for sheet metal working in press
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Also Published As

Publication number Publication date
RU1829977C (en) 1993-07-23
CA2027101A1 (en) 1991-04-11
EP0422491A1 (en) 1991-04-17
CA2027101C (en) 2000-05-02
DE3933806A1 (en) 1991-11-14
US5099673A (en) 1992-03-31
DE59001697D1 (en) 1993-07-15
ES2042168T3 (en) 1993-12-01

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