EP0401534B1 - Hydraulic drawing system in a single or double working press - Google Patents

Hydraulic drawing system in a single or double working press Download PDF

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Publication number
EP0401534B1
EP0401534B1 EP90108771A EP90108771A EP0401534B1 EP 0401534 B1 EP0401534 B1 EP 0401534B1 EP 90108771 A EP90108771 A EP 90108771A EP 90108771 A EP90108771 A EP 90108771A EP 0401534 B1 EP0401534 B1 EP 0401534B1
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EP
European Patent Office
Prior art keywords
pressure
bearers
bearer
drawing device
hydraulic cylinders
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP90108771A
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German (de)
French (fr)
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EP0401534A1 (en
Inventor
Erich Harsch
Gebhard Engler
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Maschinenfabrik Mueller Weingarten AG
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Maschinenfabrik Mueller Weingarten AG
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Priority claimed from DE19893915794 external-priority patent/DE3915794A1/en
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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
    • B21D24/02—Die-cushions
    • 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 a hydraulic pulling device in the press table of a single- or double-acting press according to the preamble of claim 1.
  • the workpiece is raised to the level of the transport plane either by means of a separate lifting cylinder or by means of the pressure cylinders arranged in the companionway for holding or holding the workpiece. This lifting movement occurs either by directly following the pulling device on the plunger or delayed for the plunger run-up.
  • FIGS. 1a, 1b The exemplary embodiment according to FIGS. 1a, 1b is first described below:
  • a lower tool part 3 with sheet holder 4 and pressure pin 8 is placed on the sliding table 2 mounted on the press table 1.
  • the pulling device is raised to the parts transport level.
  • the upper tool part 6 is attached to the ram 7 of the press.
  • the pressure cylinder 10 or its pressure source are out of function and the pressure cheeks 9 are lowered as far as possible against the pressure cylinder 10.
  • the exact upper position of the pressure cheeks 9 is achieved by the adjusting device, consisting of housing 33, worm wheel 22, worm 21 and threaded spindle 20 in connection with a geared brake motor and angle encoder.
  • the device with the lifting cylinder 19, depending on the choice, is brought back into the transport position, depending on the ram, or, depending on the number of strokes of the press and thus the run-up speed, about 20 to 80 mm before the upper end position by a proportional valve is braked with a displacement sensor and driven to a stop at reduced speed.
  • the four pressure cylinders 16 are moved upwards with reduced pressure following the pressure cheek 11 and are therefore also braked approximately 20 to 80 mm before the upper end position.
  • Fig. 1b two lower tool parts 3 with sheet metal holder 4 and pressure pin 8 are placed on the sliding table 2.
  • the pulling device is raised at the transport level.
  • the two upper tool parts 6 are attached to the ram 7 of the press.
  • the pistons of the pressure cylinder 10 have moved into their upper end position.
  • the exact upper position of the pressure cheeks 9, 9 ' is in turn achieved by the adjusting device consisting of housing 33, worm wheel 22, worm 21 and threaded spindle 20 in connection with a geared brake motor and encoder.
  • the pressure setpoint is increased to the desired value for the drawing process; after an immersion depth of approximately 20 mm, the position control of the proportional valves also begins.
  • a lower tool part 3 with a sheet metal holder 4 and pressure pin 8 is placed on the sliding table 2 mounted on the press table 1; the pulling device is raised to the parts transport level.
  • the upper tool part 6 is attached to the ram 7 of the press.
  • the exact upper position of the pressure cheeks 9 is achieved by the adjusting nuts 25.
  • the adjusting devices consisting of housing 33, worm wheel 22, worm 21 and threaded spindle 20 in connection with servomotors, are driven onto the stops on the piston rods 15, 18; the pressure box 11 lies here with the upper stops on the pressure cheeks 9, 9 '.
  • the piston rods of the internal pressure cylinders 16 are lowered by actuation by means of proportional valves 35 and closing of valves 45 and are out of function.
  • the counter-holding force is now regulated separately by the targeted metering of the hydraulic oil displaced from the cylinders 16 with the aid of proportional valves 35 in conjunction with pressure transducers 36 for detecting the respective actual values for each of the four external pressure points .
  • the valve 28 of the two lifting cylinders 19 is without tension during the drawing process.
  • the pressure cheeks 9 lie on the pressure box 11 during the entire stroke and thus guarantee an exact parallel support of the pressure bolts 8.
  • the device with the lifting cylinders 19 is activated by actuating the valve 28 and proportional valve 27, depending on the choice, following the plunger or delayed in the parts transport position, depending on the number of strokes of the press and thus the run-up speed of the device approx. 20 to 80 mm before the upper end position is braked with the proportional valve 27 in connection with a displacement transducer and is driven to a stop at a reduced speed.
  • the four outer pressure cylinders 16 are moved upwards by driving the valves 42 with reduced pressure, following the pressure box 11, and thus also braked approx. 20 to 80 mm before the upper end position.
  • the two upper tool parts 6 are attached to the ram 7 of the press.
  • the exact upper position of the pressure cheeks 9 is achieved by the adjusting nut 25.
  • the adjusting devices consisting of the housings 33, the worm wheels 22, the worms 21 and the threaded spindles 20 in connection with servomotors, are retracted as far as they will go; the pressure box 11 rests on the lower stops 12.
  • the directional control valves 45 are activated so that all eight pressure cylinders 16 are in operation.
  • the counter-holding force is in turn increased by the targeted metering of the hydraulic oil displaced from the cylinders 16 with the aid of the proportional valves 35 in conjunction with pressure transducers 36 to record the respective actual values for each of the pressure points and four each regulated separately for each tool.
  • a pre-acceleration of the pulling device can be done by one of the two in the centrally located tool Pre-acceleration cylinder 61 can be reached, for which purpose valve 46 is opened and valve 47 is closed.
  • the four outer pressure cylinders with the connections B1, B2, C1, C2 are combined to form a pre-acceleration unit.
  • a pressure intensifier 83 can be set in motion by actuating valves 82, which acts on the upper cylinder space of the lifting cylinders with hydraulic oil. This accelerates the two pistons of the lifting cylinder downwards. At the same time, oil is displaced from the four outer pressure cylinders, which actuates the pre-acceleration cylinder via connections B1, B2, C1 and C2, which has the same effective area as the pressure cylinders.
  • the speed of the piston 63 and thus the piston rod 15 or the lifting piston 18 can be adapted to the speed of the plunger 7 in connection with distance measuring devices. After about 80 mm of travel of the piston 63, it gradually runs over a bore 64 and is braked before it hits a stop after 100 mm. This 80 mm travel corresponds to a stroke of 20 mm for each of the four printing cylinders.
  • valve 46 can be closed and the valve 47 can be opened, ie a pre-acceleration cylinder is provided for the four pressure cylinders on each side.
  • the functional sequence is the same as for a centrally positioned tool.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Control Of Presses (AREA)

Description

Die Erfindung bezieht sich auf eine hydraulische Zieheinrichtung im Pressentisch einer einfach- oder doppeltwirkenden Presse nach dem Oberbegriff des Anspruchs 1.The invention relates to a hydraulic pulling device in the press table of a single- or double-acting press according to the preamble of claim 1.

Zum Umformen von Ziehteilen ist es notwendig, das in das Werkzeug eingelegte Werkstück zu halten und der vom Stößel während dessen Niedergang aufgebrachten Kraft eine Gegenkraft über ein nachgebendes Polster entgegenwirken zu lassen.To form drawn parts, it is necessary to hold the workpiece inserted in the tool and to counteract the force exerted by the ram during its decline with a counterforce via a yielding cushion.

Nach Beendigung dieses Vorganges wird das Werkstück entweder über einen separaten Anhebezylinder oder durch die beim Niedergang für das Festhalten bzw. Gegenhalten des Werkstücks angeordneten Druckzylinder auf die Höhe der Transportebene angehoben. Diese Anhebebewegung geschieht entweder durch direktes Nachfolgen der Zieheinrichtung am Stößel oder verzögert zum Stößelhochlauf.After completion of this process, the workpiece is raised to the level of the transport plane either by means of a separate lifting cylinder or by means of the pressure cylinders arranged in the companionway for holding or holding the workpiece. This lifting movement occurs either by directly following the pulling device on the plunger or delayed for the plunger run-up.

Es ist bekannt, beim Ziehen mit einem Werkzeug die Gegenkraft beim Niedergang des Stößels durch vier an den Ecken einer Druckwange wirkende einzeln drucksteuerbare Druckzylinder aufzubringen (DE 32 42 705 C2).It is known, when pulling with a tool, to apply the counterforce when the tappet is lowered by four individually pressure-controllable pressure cylinders acting on the corners of a pressure cheek (DE 32 42 705 C2).

Demgegenüber ist es Aufgabe der Erfindung, bei einer Zieheinrichtung für den wahlweisen Betrieb mit einem mittig angeordneten Werkzeug oder mit zwei in Durchlaufrichtung parallelen Werkzeugen den Wechsel der Kissenbetriebsweise ohne Umbau zu realisieren, was durch die Merkmale des Anspruchs 1 erreicht wird.In contrast, it is an object of the invention to implement the change of the cushion operation without conversion in a pulling device for optional operation with a centrally arranged tool or with two tools parallel in the direction of passage, which is achieved by the features of claim 1.

Weitere Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Further embodiments of the invention are specified in the subclaims.

Die Erfindung wird anhand der Zeichnung, die zwei Ausführungsbeispiele darstellt, näher erläutert.The invention is explained in more detail with reference to the drawing, which shows two exemplary embodiments.

Es zeigen:

  • Fig. 1a, 1b ein erstes Ausführungsbeispiel, wobei
  • Fig. 1a die Zieheinrichtung auf das Blechhalterelement eines mittig angeordneten Werkzeuges wirkend zeigt, mit zwischen den Druckwangen angeordneten Druckzylindern und
  • Fig. 1b die Zieheinrichtung nach Fig. 1a zeigt, mit zwei auf die Blechhalterelemente wirkenden Werkzeugen.
Show it:
  • 1a, 1b, a first embodiment, wherein
  • Fig. 1a shows the pulling device acting on the sheet metal holder element of a centrally arranged tool, with pressure cylinders and arranged between the pressure cheeks
  • Fig. 1b shows the drawing device according to Fig. 1a, with two tools acting on the sheet metal holder elements.

Es zeigen weiterhin Fig. 2a, 2b ein zweites Ausführungsbeispiel, wobei

  • Fig. 2a die Zieheinrichtung auf das Blechhalterelement eines mittig angeordneten Werkzeuges wirkend zeigt, mit Druckzylindereinheiten, die durch die untere Druckwange hindurch wirken und
  • Fig. 2b die Zieheinrichtung nach Fig. 2a zeigt, mit zwei auf die Blechhalterelemente wirkenden Werkzeugen.
2a, 2b show a second embodiment, wherein
  • Fig. 2a shows the pulling device acting on the sheet metal holder element of a centrally arranged tool, with pressure cylinder units which act through the lower pressure cheek and
  • Fig. 2b shows the drawing device according to Fig. 2a, with two tools acting on the sheet metal holder elements.

Es zeigen weiterhin

  • Fig. 3 den Anhebezylinder mit den Steuer- und Regelkomponenten und
  • Fig. 4 zwei Druckzylinder mit hydraulischen Komponenten, die vorzugsweise beim Ausführungsbeispiel nach Fig. 2a und 2b eingesetzt sind.
It continues to show
  • Fig. 3, the lifting cylinder with the control and regulating components and
  • Fig. 4 two pressure cylinders with hydraulic components, which are preferably used in the embodiment of FIGS. 2a and 2b.

Nachstehend wird zunächst das Ausführungsbeispiel nach Fig. 1a, 1b beschrieben:The exemplary embodiment according to FIGS. 1a, 1b is first described below:

Wie aus Fig. 1a ersichtlich, ist auf dem auf dem Pressentisch 1 gelagerten Schiebetisch 2 ein Werkzeugunterteil 3 mit Blechhalter 4 und Druckbolzen 8 aufgesetzt. Die Zieheinrichtung ist auf die Teiletransportebene angehoben. Am Stößel 7 der Presse ist das Werkzeugoberteil 6 befestigt. Die Druckzylinder 10 bzw. deren Druckquelle sind außer Funktion und die Druckwangen 9 sind bis zum Anschlag an die Druckzylinder 10 abgesenkt.As can be seen from FIG. 1 a, a lower tool part 3 with sheet holder 4 and pressure pin 8 is placed on the sliding table 2 mounted on the press table 1. The pulling device is raised to the parts transport level. The upper tool part 6 is attached to the ram 7 of the press. The pressure cylinder 10 or its pressure source are out of function and the pressure cheeks 9 are lowered as far as possible against the pressure cylinder 10.

Die exakte obere Stellung der Druckwangen 9 wird durch die Verstelleinrichtung, bestehend aus Gehäuse 33, Schneckenrad 22, Schnecke 21 und Gewindespindel 20 in Verbindung mit einem Getriebebremsmotor und Winkelcodierer erreicht.The exact upper position of the pressure cheeks 9 is achieved by the adjusting device, consisting of housing 33, worm wheel 22, worm 21 and threaded spindle 20 in connection with a geared brake motor and angle encoder.

Beim Auffahren des Werkzeugoberteiles 6 auf den Blechhalter 4 mit Werkstück 5 wird nun die Gegenhaltekraft durch Proportionalventile der vier Druckzylinder 16 in Verbindung mit einem Druckaufnehmer auf den eingegebenen Wert eines jeden Druckpunktes separat geregelt.When the upper tool part 6 moves onto the sheet metal holder 4 with the workpiece 5, the counter-holding force is now regulated separately by proportional valves of the four pressure cylinders 16 in conjunction with a pressure sensor to the entered value of each pressure point.

Nach Beendigung des Ziehvorganges wird die Einrichtung mit dem Anhebezylinder 19 je nach Wahl dem Stößel folgend oder verzögert wieder in Transportstellung gebracht, wobei sie je nach Hubzahl der Presse und damit die Hochlaufgeschwindigkeit ca. 20 bis 80 mm vor der oberen Endlage von einem Proportionalventil in Verbindung mit einem Wegaufnehmer abgebremst und mit verminderter Geschwindigkeit auf Anschlag gefahren wird.After completion of the pulling process, the device with the lifting cylinder 19, depending on the choice, is brought back into the transport position, depending on the ram, or, depending on the number of strokes of the press and thus the run-up speed, about 20 to 80 mm before the upper end position by a proportional valve is braked with a displacement sensor and driven to a stop at reduced speed.

Gleichzeitig werden die vier Druckzylinder 16 mit vermindertem Druck der Druckwange 11 folgend nach oben gefahren und damit ebenfalls ca. 20 bis 80 mm vor der oberen Endlage abgebremst.At the same time, the four pressure cylinders 16 are moved upwards with reduced pressure following the pressure cheek 11 and are therefore also braked approximately 20 to 80 mm before the upper end position.

In Fig. 1b sind auf dem Schiebetisch 2 zwei Werkzeugunterteile 3 mit Blechhalter 4 und Druckbolzen 8 aufgesetzt. Die Zieheinrichtung ist auf Transportebene angehoben.In Fig. 1b, two lower tool parts 3 with sheet metal holder 4 and pressure pin 8 are placed on the sliding table 2. The pulling device is raised at the transport level.

Am Stößel 7 der Presse sind die beiden Werkzeugoberteile 6 befestigt. Die Kolben der Druckzylinder 10 sind in ihre obere Endlage gefahren. Die exakte obere Stellung der Druckwangen 9, 9′ wird wiederum durch die Verstelleinrichtung, bestehend aus Gehäuse 33, Schneckenrad 22, Schnecke 21 und Gewindespindel 20 in Verbindung mit einem Getriebebremsmotor und Winkelcodierer erreicht. Beim Niedergang des Stößels, jedoch vor dem Auffahren der Werkzeugoberteile 6 auf die Blechhalter 4 und Werkstücke 5 wird der Druck in den Druckzylindern 10 auf den vorgegebenen minimalen Wert geregelt, der jedoch größer als der Anhebedruck der Druckquelle ist.The two upper tool parts 6 are attached to the ram 7 of the press. The pistons of the pressure cylinder 10 have moved into their upper end position. The exact upper position of the pressure cheeks 9, 9 'is in turn achieved by the adjusting device consisting of housing 33, worm wheel 22, worm 21 and threaded spindle 20 in connection with a geared brake motor and encoder. When the ram falls, but before the upper tool parts 6 move onto the sheet metal holder 4 and workpieces 5, the pressure in the pressure cylinders 10 is regulated to the predetermined minimum value, which, however, is greater than the lifting pressure of the pressure source.

Nach einer Eintauchtiefe der Druckzylinder 10 von ca. 5 mm, ermittelt an Wegmessern, wird der Drucksollwert auf den gewünschten Wert für den Ziehvorgang erhöht, nach ca. 20 mm Eintauchtiefe setzt auch die Lageregelung der Proportionalventile ein.After an immersion depth of the pressure cylinder 10 of approximately 5 mm, determined on displacement meters, the pressure setpoint is increased to the desired value for the drawing process; after an immersion depth of approximately 20 mm, the position control of the proportional valves also begins.

Diese regeln den Durchfluß der Druckzylinder 16 in Verbindung mit den Wegmessern so, daß eine konstante Eindringtiefe von ca. 30 mm an den Wegmessern erhalten bleibt, während die Druckzylinder 16 den restlichen Hub ausführen.These regulate the flow of the pressure cylinders 16 in connection with the travel meters so that a constant depth of penetration of approximately 30 mm is maintained on the travel meters while the pressure cylinders 16 carry out the remaining stroke.

Der Hochgang der Zieheinrichtung verläuft in gleicher Weise, wie bei Fig. 1a beschrieben, wobei die Kolben der Druckzylinder 10 während des Hochganges des Anhebezylinders mit einem Druck, der einer um ca. 10 % größeren Kraft, als der des Anhebezylinders entspricht, wieder langsam ausgefahren werden.The upward movement of the pulling device proceeds in the same way as described in FIG. 1a, the pistons of the pressure cylinder 10 being extended again slowly during the upward movement of the lifting cylinder with a pressure which corresponds to a force which is approximately 10% greater than that of the lifting cylinder will.

Nachfolgend ist das zweite Ausführungsbeispiel beschrieben, wobei sich die Bezugszeichen im Zweifelsfall auf die Fig. 2a, 2b sowie Fig. 3 und Fig. 4 beziehen.The second exemplary embodiment is described below, the reference numerals in cases of doubt relating to FIGS. 2a, 2b and FIGS. 3 and 4.

Wie aus Fig. 2a ersichtlich, ist auf dem auf dem Pressentisch 1 gelagerten Schiebetisch 2 ein Werkzeugunterteil 3 mit Blechhalter 4 und Druckbolzen 8 aufgesetzt; die Zieheinrichtung ist auf die Teiletransportebene angehoben. Am Stößel 7 der Presse ist das Werkzeugoberteil 6 befestigt. Die exakte obere Stellung der Druckwangen 9 wird durch die Verstellmuttern 25 erreicht.As can be seen from FIG. 2a, a lower tool part 3 with a sheet metal holder 4 and pressure pin 8 is placed on the sliding table 2 mounted on the press table 1; the pulling device is raised to the parts transport level. The upper tool part 6 is attached to the ram 7 of the press. The exact upper position of the pressure cheeks 9 is achieved by the adjusting nuts 25.

Die Verstelleinrichtungen, bestehend aus Gehäuse 33, Schneckenrad 22, Schnecke 21 und Gewindespindel 20 in Verbindung mit Stellmotoren sind auf die Anschläge an den Kolbenstangen 15, 18 aufgefahren; der Druckkasten 11 liegt hierbei mit den oberen Anschlägen an den Druckwangen 9, 9′ an. Die Kolbenstangen der innenliegenden Druckzylinder 16 sind durch Ansteuern mittels Proportionalventile 35 und Schließen von Ventilen 45 abgesenkt und außer Funktion.The adjusting devices, consisting of housing 33, worm wheel 22, worm 21 and threaded spindle 20 in connection with servomotors, are driven onto the stops on the piston rods 15, 18; the pressure box 11 lies here with the upper stops on the pressure cheeks 9, 9 '. The piston rods of the internal pressure cylinders 16 are lowered by actuation by means of proportional valves 35 and closing of valves 45 and are out of function.

Beim Auffahren des Werkzeugoberteiles 6 auf den Blechhalter 4 und Werkstück 5 wird nun die Gegenhaltekraft durch die gezielte Dosierung des aus den Zylindern 16 verdrängten Hydrauliköles mit Hilfe von Proportionalventilen 35 in Verbindung mit Druckaufnehmern 36 zum Erfassen der jeweiligen Istwerte für jeden der vier außenliegenden Druckpunkte separat geregelt. Das Ventil 28 der beiden Anhebezylinder 19 ist während des Ziehvorganges ohne Spannung. Die Druckwangen 9 liegen während des gesamten Hubes auf dem Druckkasten 11 und garantieren somit eine exakte parallele Auflage der Druckbolzen 8.When the upper tool part 6 moves onto the sheet metal holder 4 and workpiece 5, the counter-holding force is now regulated separately by the targeted metering of the hydraulic oil displaced from the cylinders 16 with the aid of proportional valves 35 in conjunction with pressure transducers 36 for detecting the respective actual values for each of the four external pressure points . The valve 28 of the two lifting cylinders 19 is without tension during the drawing process. The pressure cheeks 9 lie on the pressure box 11 during the entire stroke and thus guarantee an exact parallel support of the pressure bolts 8.

Nach Beendigung des Ziehvorganges wird die Einrichtung mit den Anhebezylindern 19 durch Ansteuern des Ventils 28 und Proportionalventiles 27 je nach Wahl dem Stößel folgend oder verzögert wieder in Teiletransportstellung gebracht, wobei je nach Hubzahl der Presse und damit der Hochlaufgeschwindigkeit der Einrichtung ca. 20 bis 80 mm vor der oberen Endlage mit dem Proportionalventil 27 in Verbindung mit einem Wegaufnehmer abgebremst und mit verminderter Geschwindigkeit auf Anschlag gefahren wird.After completion of the pulling process, the device with the lifting cylinders 19 is activated by actuating the valve 28 and proportional valve 27, depending on the choice, following the plunger or delayed in the parts transport position, depending on the number of strokes of the press and thus the run-up speed of the device approx. 20 to 80 mm before the upper end position is braked with the proportional valve 27 in connection with a displacement transducer and is driven to a stop at a reduced speed.

Gleichzeitig werden die vier äußeren Druckzylinder 16 durch Ansteuern der Ventile 42 mit vermindertem Druck dem Druckkasten 11 folgend nach oben gefahren und damit ebenfalls ca. 20 bis 80 mm vor der oberen Endlage abgebremst.At the same time, the four outer pressure cylinders 16 are moved upwards by driving the valves 42 with reduced pressure, following the pressure box 11, and thus also braked approx. 20 to 80 mm before the upper end position.

Gemäß Fig. 2b sind auf dem Schiebetisch 2 zwei Werkzeugunterteile 3 mit Blechhalter 4 und Druckbolzen 8 aufgesetzt; die Zieheinrichtung ist auf Transportebene angehoben.According to FIG. 2b, two lower tool parts 3 with sheet metal holder 4 and pressure pin 8 are placed on the sliding table 2; the pulling device is raised at the transport level.

Am Stößel 7 der Presse sind die beiden Werkzeugoberteile 6 befestigt. Die exakte obere Stellung der Druckwangen 9 wird durch die Verstellmutter 25 erreicht.The two upper tool parts 6 are attached to the ram 7 of the press. The exact upper position of the pressure cheeks 9 is achieved by the adjusting nut 25.

Die Verstelleinrichtungen, bestehend aus den Gehäusen 33, den Schneckenrädern 22, den Schnecken 21 und den Gewindespindeln 20 in Verbindung mit Stellmotoren sind bis zum Anschlag eingefahren; der Druckkasten 11 liegt an den unteren Anschlägen 12 auf.The adjusting devices, consisting of the housings 33, the worm wheels 22, the worms 21 and the threaded spindles 20 in connection with servomotors, are retracted as far as they will go; the pressure box 11 rests on the lower stops 12.

Die Wegeventile 45 sind angesteuert, so daß sämtliche acht Druckzylinder 16 in Funktion sind.The directional control valves 45 are activated so that all eight pressure cylinders 16 are in operation.

Beim Auffahren der Werkzeugoberteile 6 auf die Blechhalter 4 und Werkstücke 5 wird nun die Gegenhaltekraft wiederum durch die gezielte Dosierung des aus den Zylindern 16 verdrängten Hydrauliköles mit Hilfe der Proportionalventile 35 in Verbindung mit Druckaufnehmern 36 zum Erfassen der jeweiligen Istwerte für jeden der Druckpunkte und jeweils vier pro Werkzeug separat geregelt.When the upper tool parts 6 move onto the sheet metal holders 4 and workpieces 5, the counter-holding force is in turn increased by the targeted metering of the hydraulic oil displaced from the cylinders 16 with the aid of the proportional valves 35 in conjunction with pressure transducers 36 to record the respective actual values for each of the pressure points and four each regulated separately for each tool.

Der Hochgang der Zieheinrichtung verläuft in gleicher Weise, wie hinsichtlich der Fig. 2a beschrieben, wobei der Druckkasten 11 jedoch in seiner unteren Endlage verharrt und nur die Druckwangen 9, 9′ jeweils durch einen Anheber hochgefahren werden.The upward movement of the pulling device runs in the same way as described with regard to FIG. 2a, but the pressure box 11 remains in its lower end position and only the pressure cheeks 9, 9 'are each raised by a lifter.

Eine Vorbeschleunigung der Zieheinrichtung kann beim mittig angeordneten Werkzeug durch einen der beiden Vorbeschleunigungszylinder 61 erreicht werden, wozu Ventil 46 geöffnet und Ventil 47 geschlossen wird. Die vier äußeren Druckzylinder mit den Anschlüssen B1, B2, C1, C2 sind dadurch zu einer Vorbeschleunigungseinheit zusammengefaßt.A pre-acceleration of the pulling device can be done by one of the two in the centrally located tool Pre-acceleration cylinder 61 can be reached, for which purpose valve 46 is opened and valve 47 is closed. The four outer pressure cylinders with the connections B1, B2, C1, C2 are combined to form a pre-acceleration unit.

Kurz vor dem Auffahren des Stößels 7 auf die Zieheinrichtung kann durch Ansteuern von Ventilen 82 ein Druckübersetzer 83 in Gang gebracht werden, der den oberen Zylinderraum der Anhebezylinder mit Hydrauliköl beaufschlagt. Dadurch werden die beiden Kolben der Anhebezylinder nach unten beschleunigt. Gleichzeitig wird aus den vier äußeren Druckzylindern Öl verdrängt, das über die Anschlüsse B1, B2, C1 und C2 den Vorbeschleunigungszylinder betätigt, der die gleiche Wirkfläche aufweist, wie die Druckzylinder.Shortly before the plunger 7 moves onto the pulling device, a pressure intensifier 83 can be set in motion by actuating valves 82, which acts on the upper cylinder space of the lifting cylinders with hydraulic oil. This accelerates the two pistons of the lifting cylinder downwards. At the same time, oil is displaced from the four outer pressure cylinders, which actuates the pre-acceleration cylinder via connections B1, B2, C1 and C2, which has the same effective area as the pressure cylinders.

Durch ein Proportionalventil 69 kann dabei die Geschwindigkeit des Kolbens 63 und damit der Kolbenstange 15 bzw. des Anhebekolbens 18 in Zusammenhang mit Wegmessern der Geschwindigkeit des Stößels 7 angepaßt werden. Nach ca. 80 mm Weg des Kolbens 63 überfährt dieser allmählich eine Bohrung 64 und wird abgebremst, bevor er nach 100 mm auf einen Anschlag fährt. Dabei entsprechen diese 80 mm Weg einem Hub von 20 mm jedes der vier Druckzylinder.By means of a proportional valve 69, the speed of the piston 63 and thus the piston rod 15 or the lifting piston 18 can be adapted to the speed of the plunger 7 in connection with distance measuring devices. After about 80 mm of travel of the piston 63, it gradually runs over a bore 64 and is braked before it hits a stop after 100 mm. This 80 mm travel corresponds to a stroke of 20 mm for each of the four printing cylinders.

Der Rücklauf des Kolbens 63 geschieht während des Hochlaufs mit dem Proportionalventil 69 in Verbindung mit einem Speicher 70 und Druckquelle 71.The return of the piston 63 takes place during the run-up with the proportional valve 69 in connection with an accumulator 70 and pressure source 71.

Für die Vorbeschleunigung der Zieheinrichtung bei zwei parallel angeordneten Werkzeugen kann das Ventil 46 geschlossen und das Ventil 47 geöffnet sein, d. h. für die vier Druckzylinder jeder Seite ist ein Vorbeschleunigungszylinder vorgesehen.
Der Funktionsablauf ist dabei derselbe, wie bei einem mittig angeordneten Werkzeug.For the pre-acceleration of the pulling device with two tools arranged in parallel, the valve 46 can be closed and the valve 47 can be opened, ie a pre-acceleration cylinder is provided for the four pressure cylinders on each side.
The functional sequence is the same as for a centrally positioned tool.

Claims (10)

  1. Hydraulic drawing device in the mounting plate (1) of a single-acting or double-acting press, the drawing plunger (7) of which is mechanically driven and the drawing device of which is suitable for two different modes of operation which can be selected when the tools are changed, that is for operation with one tool (3, 6) situated at the centre of the drawing station or with two tools (3, 6) situated parallel in the direction of travel, wherein the workpiece holding force desired during descent of the plunger (7) is adjustable by means of four hydraulic cylinders (16) at the four comer points of a pressure bearer (11), characterized in that two further pressure bearers (9, 9′), disposed parallel to the direction of travel, are seated on the pressure bearer (11), which (further pressure bearers) can be actuated independently of the first pressure bearer (11) and are each supported by four hydraulic cylinders (10, 16) acting at the comers of the upper pressure bearers (9, 9′), and wherein the workpiece holders (4) bear via thrust bolts (8) on the upper pressure bearers (9, 9′).
  2. Drawing device according to Claim 1, characterized in that the hydraulic cylinders (10) are situated between the lower pressure bearer (11) and the upper pressure bearers (9, 9′) and that the upper pressure bearers (9, 9′) are supported by the lower pressure bearer (11) (Fig. 1a, 1b).
  3. Drawing device according to Claim 1 or 2, characterized in that the oil pressure in each of the eight cylinders (10, 16) is separately adjustable.
  4. Drawing device according to Claim 1, characterized in that a centrally disposed lifting cylinder (19) is provided.
  5. Drawing device according to Claim 1 or 4, characterized in that, for operating with a centrally disposed tool (Fig. 2a) the outer hydraulic cylinders (16) in each case act upon the lower pressure bearer (11), upon which the two upper pressure bearers (9, 9′) rest in this case, and that when operating with two tools disposed parallel (Fig. 2b), four hydraulic cylinders (16, 16′) act directly uppon each of the two upper pressure bearers (9, 9′).
  6. Drawing device according to Claim 1 or 5, characterized in that at least the outer hydraulic cylinders (16) possess an adjustment device (20, 21, 22), which produce a relative movement between the upper pressure bearer (9) and the lower pressure bearer (11) and that, when operation with a centrally disposed tool (Fig. 1), the adjustment device produces a closure together of the upper and lower pressure bearers (9, 11).
  7. Drawing device according to Claim 6, characterized in that, when operation with two tools disposed in parallel, the adjustment device (20 to 22) on the outer hydraulic cylinders creates a separation between the upper pressure bearers (9) and the lower pressure bearer (11) in such a manner that the hydraulic cylinders (16) act exclusively on the upper pressure bearers (9, 9′).
  8. Drawing device according to Claim 6 or 7, characterized in that the adjustment device consists of a casing (33) fixed to the lower pressure bearer (11) and having rotatably mounted worm wheels (22) and threaded spindles (20), a threaded spindle (20) when extended out of the casing (33) creating a force-transtting connection between upper pressure bearer (9) and lower pressure bearer (11).
  9. Drawing device according to Claim 1, characterized in that the upper cylinder chamber of the centrally disposed lifting cylinder is pressurized through a pressure transformer (83) and that the four hydraulic cylinders (16) have a connection to a pre-acceleration cylinder (61) of equal piston area and a stroke of approximately 5 x 20 mm = 100 mm.
  10. Drawing device according to Claim 9, characterized in that after approximately 80 mm travel, the piston gradually closes the cylinder bore and is decelerated and the velocity of this piston and thus of the four pistons of the hydraulic cylinders is adjustable by a proportional valve (69) and that, consequently, before the act of the plunger upon the drawing device, the latter can be pre-accelerated with a cushioning travel of 20 mm to the velocity of the plunger.
EP90108771A 1989-05-13 1990-05-10 Hydraulic drawing system in a single or double working press Expired - Lifetime EP0401534B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19893915794 DE3915794A1 (en) 1989-05-13 1989-05-13 Deep drawing press with workpiece holder - is actuated by hydraulic pistons with arrangement to vary applied force
DE3915795A DE3915795C1 (en) 1989-05-13 1989-05-13
DE3915795 1989-05-13
DE3915794 1989-05-13

Publications (2)

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EP0401534A1 EP0401534A1 (en) 1990-12-12
EP0401534B1 true EP0401534B1 (en) 1992-12-02

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ID=25880890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90108771A Expired - Lifetime EP0401534B1 (en) 1989-05-13 1990-05-10 Hydraulic drawing system in a single or double working press

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EP (1) EP0401534B1 (en)
DE (2) DE3915795C1 (en)
ES (1) ES2036072T3 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3919372A1 (en) * 1989-06-14 1990-12-20 Schuler Gmbh L PRESSURE WIRE IN THE DRAWER OF A PRESS
ES2052298T3 (en) * 1990-04-23 1994-07-01 Mueller Weingarten Maschf DEVICE FOR STUFFING A PRESS FOR STUFFING PIECES OF SHEET FORM.
IT1254188B (en) * 1991-02-12 1995-09-14 HYDROELASTIC DRAWING DEVICE
DE4112943A1 (en) * 1991-04-20 1992-10-22 Schuler Gmbh L DRAWING DEVICE IN THE PRESS TABLE OF A PRESS
DE4211639A1 (en) * 1992-04-07 1993-10-14 Schuler Gmbh L Run-up control for the pressure cheek in a drawing device
DE19711780A1 (en) * 1997-03-21 1998-09-24 Schuler Pressen Gmbh & Co Drawing device for drawing presses
JP4704047B2 (en) * 2005-01-14 2011-06-15 株式会社小松製作所 Die cushion device
CN109127849A (en) * 2018-09-28 2019-01-04 南通市腾达锻压机床厂 The hydraulic pad device of hydraulic sheet metal drawing press

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2354003A (en) * 1942-07-15 1944-07-18 Hydraulic Dev Corp Inc Hydraulic press
DE3242705C2 (en) * 1982-11-19 1985-10-31 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Compressed air device arranged in the press table of a single-acting drawing press
DE3406526C2 (en) * 1984-02-23 1987-01-15 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Single-acting press with a die cushion in the press table and a sliding table
IT1217320B (en) * 1987-06-30 1990-03-22 Fir Srl APPARATUS FOR DRAWING THE SHEET
DE3735581C1 (en) * 1987-10-21 1988-05-11 Daimler Benz Ag Press for pulling sheet metal parts

Also Published As

Publication number Publication date
ES2036072T3 (en) 1993-05-01
DE3915795C1 (en) 1991-01-31
EP0401534A1 (en) 1990-12-12
DE59000532D1 (en) 1993-01-14

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