EP0515881B1 - Press with drawing device - Google Patents

Press with drawing device Download PDF

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Publication number
EP0515881B1
EP0515881B1 EP92107829A EP92107829A EP0515881B1 EP 0515881 B1 EP0515881 B1 EP 0515881B1 EP 92107829 A EP92107829 A EP 92107829A EP 92107829 A EP92107829 A EP 92107829A EP 0515881 B1 EP0515881 B1 EP 0515881B1
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EP
European Patent Office
Prior art keywords
press
cantilever
sheet metal
thrust
ram
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92107829A
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German (de)
French (fr)
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EP0515881A1 (en
Inventor
Siegfried Baur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
L Schuler GmbH
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L Schuler GmbH
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Filing date
Publication date
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Publication of EP0515881A1 publication Critical patent/EP0515881A1/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
    • B21D24/005—Multi-stage presses
    • 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 press with a ram and press table for upper and lower tool parts, with a transfer device for the transport of sheet metal parts through the press and with a pulling device with drawing frame-fixed drawing cylinders according to the preamble of claim 1.
  • the sheet metal part When pulling in a press, the sheet metal part must be held by a sheet metal holder in the lower part of the tool against a pressure area in the upper part of the tool. After pulling, the sheet metal part is to be lifted up to the removal position for the transfer device.
  • the sheet metal holding forces and the ejector forces or movements are applied by a drawing device in the press table below the lower part of the tool.
  • the ejector movement has always been in a position that corresponded to the insertion position for the subsequent sheet metal part. If the ejector movement carried out by the pulling device was interrupted in the meantime, this was done for very different purposes.
  • a locking cylinder is connected to the drawing device in a device according to DE-PS 656 684.
  • EP 0 276 672 A2 shows a drawing apparatus in a press, the blocking device being able to be put into operation or taken out of operation.
  • the pulling device is deactivated overall during certain processing phases.
  • the movement sequences such as pre-acceleration and evaluation, which are independent of the tappet movement, are to be controlled by means of a central unit in order to achieve synchronism of the pistons acting in parallel in the run-up phases with mechanical independence from one another.
  • the central unit the intermediate height settings of the sheet metal holder and its initial stroke position can also be specified centrally.
  • the drawn sheet metal part is raised to the insertion level for removal.
  • the pull cylinders interact with stop cylinders when ejected, which can be hydraulically controlled.
  • a stroke-controllable stop for temporarily preventing the evaluation movement is also known from DE 40 32 338 A1 (& EP-A-0 422 491), which is a press with the features of the preamble of claim 1.
  • the drawing apparatus shown here acts on one in segments divided pressure cheek.
  • the drawing cylinders are arranged press-tight.
  • the piston rods of the drawing cylinders act on a lifting and lowering bracket via pressure rods, which in turn act on the segments of the pressure cheek from below via pressure rods.
  • Locking cylinders are provided which act on the bracket via a lifting bridge and prevent upward movement of the bracket and thus of the divided pressure cheek when pressure is applied.
  • the time of stopping in the run-up phase can be determined by valve control of the pressure in the locking cylinders.
  • the lifting (ejector) movement of the pressure cheek is resumed at a point in time delayed when the ram starts up.
  • the sheet metal part is raised up to the high position of the drawing device, which corresponds to the insertion position.
  • the object of the invention is to remove the drawn sheet metal part from the sheet metal holder in the earliest possible phase of the high-pitched movement of the drawing apparatus, in order to use a large period of the ram run-up movement for the transfer movement.
  • the transfer device is to be lowered further accordingly, and the movements of the transfer device and drawing apparatus and the time at which the sheet metal part is removed from the sheet holder are dependent on the ram movement, e.g. to control depending on the angle of rotation.
  • Claim 2 represents an embodiment according to the invention.
  • the press 1 in Fig. 1 shows a main drive 2 from the engine, main shaft, couplings and. Like. Means for driving plunger 3 and a setting device 8.
  • the plunger 3 are guided in stand 4.
  • the press 1 also has press tables 5.
  • the press tables 5 can be moved out of the press 1 for changing the tools or tool sets, of which one upper tool part 6 and one lower tool part 7 have been indicated in the first processing stage, which can be a drawing stage.
  • the sheet metal parts 18 are to be inserted into the drawing station by means of insertion feeder 9.
  • the conversion movement of the sheet metal parts 18 in the processing stages, possibly with temporary storage on clipboards 19, is carried out by suction bars 10 of the conversion device 8.
  • the suction beams 10 can be moved on running rails 11 in and counter to the conversion movement for the sheet metal parts 18.
  • the drawing device 20 indicated in FIG. 1 is shown in detail in FIGS. 3 and 4 and is explained for this purpose. It can be seen that the sheet metal parts 18 of the individual tools can only be removed from the lower tool parts 7 after they have been opened.
  • the invention uses the idea of access to the sheet metal part e.g. in the drawing stage already in the run-up phase of the ram. This means that via the press control, e.g. Depending on the angle of rotation, the ejection of the sheet metal part 18 from the lower tool part 7 begins at the start of the run-up of the ram 3 and the attack of the suction bar 10 on the surface of the sheet metal part 18 can take place if the required opening width between the upper tool part and the lower tool part is given.
  • the curve 22 represents the path of the tappet 3 over the angle of rotation 21.
  • the bottom dead center of the tappet 3 is fixed at 25.
  • the movements of the drawing device 20 are illustrated with 23, 24 and 26 to 29.
  • the suction bridge 10 is included the suction means 17 have been shown in a sheet metal part removal position.
  • 23 and 24 different starting heights of the drawing apparatus 20 are specified in order to do justice to the tool conditions when inserting.
  • the information indicates two possible insertion heights for different sheet metal parts.
  • the insertion feeder 9 (FIG. 1) places a sheet metal part 18 on the sheet metal holder 30 (FIGS. 3 and 4) in the drawing apparatus 20.
  • the lowering movement of the sheet metal holder 30 begins with the pre-acceleration phase for the transition to the movement of the plunger 3, curve 22.
  • Sheet metal part 18 and sheet holder 30 are lowered by the upper tool part 6 descending with the ram - drawing phase.
  • the drawing apparatus with sheet metal holder 30 briefly follows the rising plunger 3 and upper tool part 6.
  • the known blocking measures can already delay the start of the sheet metal holder when the plunger starts up.
  • the sheet metal holder 30 following the plunger 3 in its run-up movement lifts the sheet metal part 18 out of the lower tool part 7 to such an extent that it can be grasped by the suction bridge 10 with the suction means 17.
  • the sheet holder 30 is temporarily prevented from further upward movement.
  • the press control can be used to hold the drawing apparatus 20 with the sheet metal holder 30 at a removal height 26, at a removal height 27, at a removal height 28 or at any other removal height for suction bars 10 indicated by positions 26 to 28 and sheet metal part 18 take place.
  • the pulling device 20 After the pulling device 20 has been temporarily stopped in one of the predeterminable removal positions 26, 27, 28, the pulling device 20 is to be raised into the insertion position 23 or into the insertion position 24 in accordance with the curve specification 29.
  • FIG. 3 shows an area between two (four) press stands 4, for example the first processing stage shown in FIG. 1.
  • the processing stage is designed as a drawing stage and for this purpose has a drawing apparatus 20 with drawing cylinders 31 which are fixed to the frame via a crossmember 32.
  • the drawing cylinders 31 can be pressurized discretely via valves 33, ie each drawing cylinder 31 can be individually controlled in terms of an active or a passive pressure specification .
  • the drawing cylinders 31 act with the piston rods 36, in the case of the externally arranged drawing cylinders 31 via pressure bolts 37, on pressure bolts 39 held axially to them.
  • These pressure bolts 39 act via pressure pins 40, 42 on the sheet metal holder 30 in the lower tool part 7.
  • Reference number 5 refers to a sliding table, reference number 6 to that Tool upper part and code number 8 on the conversion device for the sheet metal parts 18 that can be removed from the sheet metal holder 30 by means of suction bars 10 and suction means 17.
  • An otherwise raisable and lowerable bracket 34 is supported by collars 38 on the pressure bolts 37.
  • the sheet holder 30 is e.g. 30 mm raised, which may correspond to a removal position 26 or 27 or 28 in Fig. 2. In this position, the sheet metal part 18 can be removed from the sheet holder 30 by the suction means 17 of the suction bar 10 and raised to the transport height indicated by 18 1.
  • the console 34 is rigidly connected to a lifting bridge 47 by means of stud bolts 41.
  • Spindles 44 are mounted on the lifting bridge 47 and can be screwed into it.
  • the spindles 44 cooperate with stop cylinders 45, which are fixed to the frame via a support bar 43. The detailed arrangement is explained in more detail below in relation to FIG. 5.
  • the stops are positioned at a total of 35 and, through their spindles 44, bring about the setting of different removal positions 26, 27, 28.
  • FIG. 4 shows the same arrangement of the stops 35 as shown in FIG. 3.
  • the drawing cylinders 31 of the drawing apparatus 20 act on a pressure cheek 46 via their piston rods 36 and pressure bolts 37 and pressure bolts 39.
  • On the pressure cheek 46 support push pins 40 which are placed from below against the sheet metal holder 30 in the lower tool part 7 and which has already been raised into one of the removal positions 26, 27, 28 for a sheet metal part 18.
  • the other item numbers correspond to identical or functionally identical parts as in FIG. 3.
  • FIG. 5 shows a section of the stop area for the console 34 shown in FIGS. 3 and 4.
  • a left stop 35L is shown; a right stop 35R has only been hinted at to To enable a view of a high stop end stop positioned with a total of 59.
  • the stops 35 (35L, 35R) each have a spindle 44.
  • the spindle 44 is rotatably mounted in a threaded bush 48 in the lifting bridge 47 and can thus be screwed out of and into the latter.
  • the end part 55 of the spindle 44 interacts with the piston 56 of a stop cylinder 45.
  • the pressure space 57 of the stop cylinder 45 can be filled with pressure medium via a pressure line 58 in accordance with the circuit structure in FIG. 6.
  • the piston 56 If the pressure chamber 57 is pressurized, the piston 56 is in its lower end position and a distance (gap) 67 is formed between its underside and the opposite end part 55, which makes it possible to lift the lifting bridge 47 by this amount by means of the pulling cylinder 31 ( 3 and 4).
  • the spindle 44 has a groove 49 in its upper region near the end part 55.
  • a key 50 is inserted into the groove and is held in a collar bushing 51.
  • a gear wheel of a gear pair 52 is placed on the flange bushing 51.
  • the gear pair 52 can be acted upon in the direction of rotation by a motor 53 which is fixed to the frame in a mounting bracket 54.
  • the rotation of the collar bushing 51 with feather key 50 causes a change in the gap 67 between the piston 56 and the end part 55 of the spindle 44 by driving the spindle 44.
  • the gap 67 is thus decisive for the removal positions 26, 27 or 28 or any intermediate dimension of the raised sheet metal holder 30 .
  • the height 23, 24 in FIG. 2 of the sheet metal holder 30 for inserting a new sheet metal part 18 can be adjusted by rotating the spindle 60 of the feeder stop 59.
  • the pressure spaces 57 of the stop cylinders 45 can be connected via the pressure line 58 and directional valves 62 or 63 to a low-pressure source 65 with large volume delivery and / or a high-pressure source 66.
  • the curve shape 29 (FIG. 2), and accordingly the run-up movement of the sheet metal holder 30 after the sheet metal part 18 has been removed, can be adjusted via the proportional directional valve 64.

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

Description

Die Erfindung betrifft eine Presse mit Stößel und Pressentisch für Werkzeugober- und -unterteile, mit einer Umsetzeinrichtung für den Transport von Blechteilen durch die Presse und mit einer Zieheinrichtung mit pressengestellfesten Ziehzylindern entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to a press with a ram and press table for upper and lower tool parts, with a transfer device for the transport of sheet metal parts through the press and with a pulling device with drawing frame-fixed drawing cylinders according to the preamble of claim 1.

Beim Ziehen in einer Presse ist das Blechteil von einem Blechhalter im Werkzeugunterteil gegen einen Andruckbereich im Werkzeugoberteil zu halten. Nach dem Ziehen ist das Blechteil bis in die Entnahmeposition für die Umsetzeinrichtung anzuheben. Die Blechhaltekräfte und die Auswerferkräfte bzw. -bewegungen werden von einem Ziehapparat im Pressentisch unterhalb des Werkzeugunterteils aufgebracht. Die Auswerferbewegung erfolgte bisher immer bis in eine Position, die der Einlegeposition für das nachfolgende Blechteil entsprach. Wenn die von dem Ziehapparat ausgeführte Auswerferbewegung zwischenzeitlich unterbrochen wurde, erfolgte dies zu sehr unterschiedlichen Zwecken.When pulling in a press, the sheet metal part must be held by a sheet metal holder in the lower part of the tool against a pressure area in the upper part of the tool. After pulling, the sheet metal part is to be lifted up to the removal position for the transfer device. The sheet metal holding forces and the ejector forces or movements are applied by a drawing device in the press table below the lower part of the tool. Up to now, the ejector movement has always been in a position that corresponded to the insertion position for the subsequent sheet metal part. If the ejector movement carried out by the pulling device was interrupted in the meantime, this was done for very different purposes.

Um ein zeitgleiches Anheben der Druckwange mit der Hochlaufbewegung des Pressenstößels und somit ein sofortiges Ausheben des Blechteils aus dem Werkzeugunterteil zu vermeiden, wird bei einer Einrichtung nach der DE-PS 656 684 ein Sperrzylinder mit dem Ziehapparat verbunden.In order to avoid simultaneous lifting of the pressure cheek with the run-up movement of the press ram and thus immediate lifting of the sheet metal part from the lower part of the tool, a locking cylinder is connected to the drawing device in a device according to DE-PS 656 684.

Aus der DE-AS 24 08 096 ist es bekannt, die Kolbenstange des/der Ziehzylinder(s) und die Kolbenstange eines Sperrzylinders getrennt auf die Druckwange wirken zu lassen.From DE-AS 24 08 096 it is known to let the piston rod of the drawing cylinder (s) and the piston rod of a locking cylinder act separately on the pressure cheek.

In der EP 0 276 672 A2 ist ein Ziehapparat in einer Presse dargestellt, wobei die Sperrvorrichtung wahlweise in Betrieb oder außer Betrieb zu setzen ist. Der Ziehapparat ist hierbei während bestimmter Bearbeitungsphasen insgesamt außer Betrieb gesetzt.EP 0 276 672 A2 shows a drawing apparatus in a press, the blocking device being able to be put into operation or taken out of operation. The pulling device is deactivated overall during certain processing phases.

Weiterhin ist es aus der DE 35 05 984 A1 bei einem Ziehapparat bekannt, die Auswerferbewegung des Blechhalters zeitverzögert auf den Hochlauf des Stößels zu starten. Die Geschwindigkeit der Auswerferbewegung bis in die Entnahmeposition, die hierbei gleichfalls der Einlegeposition entspricht, ist dabei zu steuern.Furthermore, it is known from DE 35 05 984 A1 in a drawing apparatus to start the ejector movement of the sheet metal holder with a time delay when the ram starts up. The speed of the ejector movement into the removal position, which also corresponds to the insertion position, is to be controlled.

Bei der DE 38 07 683 A1 sollen die von der Stößelbewegung unabhängigen Bewegungsabläufe wie Vorbeschleunigen und Auswerten vermittels einer Zentraleinheit gesteuert werden, um einen Gleichlauf der parallel wirkenden Kolben in den Hochlaufphasen bei mechanischer Unabhängigkeit voneinander zu erreichen. Desweiteren sollen mit der Zentraleinheit auch die Zwischen-Höheneinstellungen des Blechhalters sowie seine Hubausgangslage zentral vorgebbar sein. Das gezogene Blechteil wird zur Entnahme bis in die Einlegeebene angehoben. Zum vorübergehenden, zeitweisen Unterbinden der Auswerferbewegung wirken die Ziehzylinder beim Auswerfen mit Anschlagzylindern zusammen, die hydraulisch wegsteuerbar sind.In DE 38 07 683 A1, the movement sequences, such as pre-acceleration and evaluation, which are independent of the tappet movement, are to be controlled by means of a central unit in order to achieve synchronism of the pistons acting in parallel in the run-up phases with mechanical independence from one another. Furthermore, should the central unit, the intermediate height settings of the sheet metal holder and its initial stroke position can also be specified centrally. The drawn sheet metal part is raised to the insertion level for removal. To temporarily prevent the ejector movement, the pull cylinders interact with stop cylinders when ejected, which can be hydraulically controlled.

Ein wegsteuerbarer Anschlag zum zeitweisen Unterbinden der Auswerterbewegung ist auch aus der DE 40 32 338 A1 (& EP-A-0 422 491) bekannt, die eine Presse mit den Merkmalen des Oberbegriffs des Anspruchs 1. Der hier gezeigte Ziehapparat wirkt auf eine in Segmente unterteilte Druckwange. Die Ziehzylinder sind pressenfest angeordnet. Die Kolbenstangen der Ziehzylinder wirken über Druckstangen auf eine heb- und senkbare Konsole, die wiederum über Druckstangen von unten auf die Segmente der Druckwange wirken. Es sind Sperrzylinder vorgesehen, die über eine Hubbrücke an der Konsole angreifen und bei Druckbeaufschlagung eine Aufwärtsbewegung der Konsole und somit der geteilten Druckwange verhindern. Der Zeitpunkt des Halts in der Hochlaufphase ist durch eine Ventilsteuerung des Druckes in den Sperrzylindern bestimmbar. Die Hochbringer-(Auswerfer-)bewegung der Druckwange wird zu einem auf die Hochlaufbewegung des Stößels verzögerten Zeitpunkt erneut aufgenommen. Auch hier wird das Blechteil bis in die Hochlage des Ziehapparats, die der Einlegeposition entspricht, angehoben.A stroke-controllable stop for temporarily preventing the evaluation movement is also known from DE 40 32 338 A1 (& EP-A-0 422 491), which is a press with the features of the preamble of claim 1. The drawing apparatus shown here acts on one in segments divided pressure cheek. The drawing cylinders are arranged press-tight. The piston rods of the drawing cylinders act on a lifting and lowering bracket via pressure rods, which in turn act on the segments of the pressure cheek from below via pressure rods. Locking cylinders are provided which act on the bracket via a lifting bridge and prevent upward movement of the bracket and thus of the divided pressure cheek when pressure is applied. The time of stopping in the run-up phase can be determined by valve control of the pressure in the locking cylinders. The lifting (ejector) movement of the pressure cheek is resumed at a point in time delayed when the ram starts up. Here, too, the sheet metal part is raised up to the high position of the drawing device, which corresponds to the insertion position.

Gegenüber der DE 40 32 338 A1 ist es Aufgabe der Erfindung, das gezogene Blechteil bereits in einer möglichst frühen Phase der Hochlautbewegung des Ziehapparats von dem Blechhalter zu entnehmen, um so auch einen großen Zeitraum der Stößelhochlaufbewegung für die Umsetzbewegung zu nutzen. Die Umsetzeinrichtung ist hierfür entsprechend weiter abzusenken und die Bewegungen von Umsetzeinrichtung und Ziehapparat und der Zeitpunkt der Entnahme des Blechteils von dem Blechhalter sind in Abhängigkeit von der Stößelbewegung, z.B. drehwinkelabhängig zu steuern.Compared to DE 40 32 338 A1, the object of the invention is to remove the drawn sheet metal part from the sheet metal holder in the earliest possible phase of the high-pitched movement of the drawing apparatus, in order to use a large period of the ram run-up movement for the transfer movement. For this purpose, the transfer device is to be lowered further accordingly, and the movements of the transfer device and drawing apparatus and the time at which the sheet metal part is removed from the sheet holder are dependent on the ram movement, e.g. to control depending on the angle of rotation.

Diese Aufgabe ist bei einer Presse mit den Merkmalen des Oberbegriffs gelöst durch die kennzeichnenden Merkmale des Anspruchs 1. Anspruch 2 stellt eine Ausgestaltung nach der Erfindung dar.This object is achieved in a press with the features of the preamble by the characterizing features of claim 1. Claim 2 represents an embodiment according to the invention.

Besondere Vorteile ergeben sich aus der Nutzung der Hochlaufphase des Stößels bereits für die Umsetzbewegungen. Die Hubzahlen sind erhöhbar. Es können größere Transferschritte gefahren werden. Die Aushebebewegung durch den Ziehapparat und dieAnhebebewegung des Blechteils durch die Umsetzeinrichtung sind variierbar.Special advantages result from the use of the run-up phase of the ram for the transfer movements. The number of strokes can be increased. Larger transfer steps can be carried out. The lifting movement by the pulling device and the lifting movement of the sheet metal part by the transfer device can be varied.

Anhand von Ausführungsbeispielen in der Zeichnung soll im folgenden die Erfindung näher erläutert werden.The invention will be explained in more detail below with the aid of exemplary embodiments in the drawing.

Es zeigen:

Fig. 1
eine Hauptansicht auf eine Pressenanlage,
Fig. 2
die Darstellung der Erfindung anhand eines Kurvenverlaufs,
Fig. 3
den Gegenstand der Erfindung in einem Ziehapparat ohne Druckwange,
Fig. 4
den Gegenstand der Erfindung in einem Ziehapparat mit einer Druckwange,
Fig. 5
eine mögliche Ausgestaltungsform des Anschlags und
Fig. 6
ein Schaltbild zur Ansteuerung der Zylinder des Anschlags.
Show it:
Fig. 1
a main view of a press system,
Fig. 2
the representation of the invention on the basis of a curve,
Fig. 3
the subject of the invention in a drawing device without a pressure cheek,
Fig. 4
the subject of the invention in a drawing apparatus with a pressure cheek,
Fig. 5
a possible embodiment of the attack and
Fig. 6
a circuit diagram for controlling the cylinder of the stop.

Die Presse 1 in Fig. 1 zeigt einen Hauptantrieb 2 aus Motor, Hauptwelle, Kupplungen u. dgl. Mittel zum Antrieb von Stößeln 3 und einer Unsetzeinrichtung 8. Die Stößel 3 sind in Ständern 4 geführt. Die Presse 1 weist weiterhin Pressentische 5 auf. Die Pressentische 5 können aus der Presse 1 herausfahrbar sein zum Wechseln der Werkzeuge oder Werkzeugsätze, von denen in der ersten Bearbeitungsstufe, die eine Ziehstufe sein kann, jeweils ein Werkzeugoberteil 6 und ein Werkzeugunterteil 7 angedeutet dargestellt worden sind. Die Blechteile 18 sind vermittels Einlegefeeder 9 in die Ziehstation einzulegen. Die Umsetzbewegung der Blechteile 18 in den Bearbeitungsstufen, ggf. unter zeitweiser Ablage auf Zwischenablagen 19, erfolgt durch Saugerbalken 10 der Umsetzeinrichtung 8. Die Saugerbalken 10 sind an Laufschienen 11 in und entgegen der Umsetzbewegung für die Blechteile 18 bewegbar. Hierzu dient ein Kurvenabgriff von Kurven 15 durch einen der Kurvenfolgerhebel 14. Die Kurven sind über eine Drehwelle 16 vom Hauptantrieb 2 treibbar. Zum Heben und Senken dient ein weiterer Kurvenabgriff vermittels eines der Kurvenfolgerhebel 14, Getriebestange 13 und Umlenkgetriebe 12 in den Bereichen der Ständer 4. Mit 17 sind Greif- bzw. Saugermittel an den Hubbalken 10 beziffert, deren Hebe-Senkbewegungen durch die Kurvenform der Kurven 14 abgestimmt ist auf die Bewegung des/der Stößel(s) 3.The press 1 in Fig. 1 shows a main drive 2 from the engine, main shaft, couplings and. Like. Means for driving plunger 3 and a setting device 8. The plunger 3 are guided in stand 4. The press 1 also has press tables 5. The press tables 5 can be moved out of the press 1 for changing the tools or tool sets, of which one upper tool part 6 and one lower tool part 7 have been indicated in the first processing stage, which can be a drawing stage. The sheet metal parts 18 are to be inserted into the drawing station by means of insertion feeder 9. The conversion movement of the sheet metal parts 18 in the processing stages, possibly with temporary storage on clipboards 19, is carried out by suction bars 10 of the conversion device 8. The suction beams 10 can be moved on running rails 11 in and counter to the conversion movement for the sheet metal parts 18. This is done by tapping curves 15 through one of the cam follower levers 14. The curves can be driven by the main drive 2 via a rotary shaft 16. A further cam tap is used for lifting and lowering by means of one of the cam follower lever 14, gear rod 13 and deflection gear 12 in the areas of the stand 4. Gripping or suction means on the lifting beam 10 are numbered 17, the lifting and lowering movements of which are due to the curve shape of the curves 14 is matched to the movement of the plunger (s) 3.

Der in Fig. 1 angedeutete Ziehapparat 20 ist im einzelnen in den Fign. 3 und 4 dargestellt und wird hierzu erläutert. Es ist ersichtlich, daß die Blechteile 18 den einzelnen Werkzeugen erst nach dem Öffnen dieser aus den Werkzeugunterteilen 7 entnehmbar sind. Andererseits nutzt die Erfindung den Gedanken des Zugriffs auf das Blechteil z.B. in der Ziehstufe bereits in der Hochlaufphase des Stößels. Das heißt, daß über die Pressensteuerung, z.B. drehwinkelabhängig, der Auswurf des Blechteils 18 aus dem Werkzeugunterteil 7 mit Beginn des Hochlaufs des Stößels 3 einsetzt und der Angriff des Saugerbalkens 10 auf der Oberfläche des Blechteils 18 erfolgen kann, wenn die entsprechend erforderliche Öffnungsweite zwischen Werkzeugoberteil und Werkzeugunterteil gegeben ist.The drawing device 20 indicated in FIG. 1 is shown in detail in FIGS. 3 and 4 and is explained for this purpose. It can be seen that the sheet metal parts 18 of the individual tools can only be removed from the lower tool parts 7 after they have been opened. On the other hand, the invention uses the idea of access to the sheet metal part e.g. in the drawing stage already in the run-up phase of the ram. This means that via the press control, e.g. Depending on the angle of rotation, the ejection of the sheet metal part 18 from the lower tool part 7 begins at the start of the run-up of the ram 3 and the attack of the suction bar 10 on the surface of the sheet metal part 18 can take place if the required opening width between the upper tool part and the lower tool part is given.

In Fig. 2 sind hierfür die Abhängigkeiten der Bewegungen von Stößel 3, Saugerbalken 10 und Ziehapparat 20 dargestellt.2 shows the dependencies of the movements of the plunger 3, suction beam 10 and drawing device 20 for this purpose.

Die Kurve 22 stellt den Weg des Stößels 3 über dem Drehwinkel 21 dar. Mit 25 ist der untere Totpunkt des Stößels 3 festgelegt. Die Bewegungen des Ziehapparats 20 sind mit 23, 24 und 26 bis 29 veranschaulicht. Um die Übergabe des Blechteils 18 von dem Blechhalter 30 an die Saugerbrücke 10 zu verdeutlichen, ist die Saugerbrücke 10 mit den Saugermitteln 17 in einer Blechteil-Entnahmeposition dargestellt worden. Mit 23 und 24 sind unterschiedliche Ausgangshöhen des Ziehapparats 20 vorgegeben, um den Werkzeugverhältnissen beim Einlegen gerecht zu werden. Die Angaben weisen auf zwei mögliche Einlegehöhen für unterschiedliche Blechteile hin. Hierbei legt der Einlegefeeder 9 (Fig. 1) ein Blechteil 18 auf den Blechhalter 30 (Fign. 3 und 4) in dem Ziehapparat 20. Die Absenkbewegung des Blechhalters 30 beginnt mit der Vorbeschleunigungsphase zum Übergang in die Bewegung des Stößels 3, Kurve 22. Blechteil 18 und Blechhalter 30 werden von dem mit dem Stößel niedergehenden Werkzeugoberteil 6 abgesenkt - Ziehphase. Nach Erreichen des unteren Totpunktes 25 folgt der Ziehapparat mit Blechhalter 30 kurzfristig dem hochgehenden Stößel 3 und Werkzeugoberteil 6. Es kann jedoch bereits hier eine Verzögerung des Blechhalter-Hochlaufs zum Stößelhochlauf durch die bekannten Sperrmaßnahmen erfolgen. Der dem Stößel 3 in dessen Hochlaufbewegung folgende Blechhalter 30 hebt das Blechteil 18 aus dem Werkzeugunterteil 7 so weit an, daß es von der Saugerbrücke 10 mit den Saugermitteln 17 erfaßbar ist. Für die Übergabe des Blechteils 18 an die Saugermittel 17 wird der Blechhalter 30 vorübergehend an einer weiteren Aufwärtsbewegung gehindert. Je nach Werkzeug bzw. Ziehtiefe kann über die Pressensteuerung drehwinkelabhängig der Halt des Ziehapparats 20 mit Blechhalter 30 in einer Entnahmehöhe 26, in einer Entnahmehöhe 27, in einer Entnahmehöhe 28 bzw. in jeder anderen, durch die Positionen 26 bis 28 angedeuteten Entnahmehöhen für Saugerbalken 10 und Blechteil 18 erfolgen. Nach dem vorübergehenden Halt des Ziehapparats 20 in einer der vorgebbaren Entnahmepositionen 26, 27, 28 ist der Ziehapparat 20 entsprechend der Kurvenvorgabe 29 in die Einlegeposition 23 oder in die Einlegeposition 24 hochzufahren.The curve 22 represents the path of the tappet 3 over the angle of rotation 21. The bottom dead center of the tappet 3 is fixed at 25. The movements of the drawing device 20 are illustrated with 23, 24 and 26 to 29. In order to clarify the transfer of the sheet metal part 18 from the sheet metal holder 30 to the suction bridge 10, the suction bridge 10 is included the suction means 17 have been shown in a sheet metal part removal position. With 23 and 24 different starting heights of the drawing apparatus 20 are specified in order to do justice to the tool conditions when inserting. The information indicates two possible insertion heights for different sheet metal parts. Here, the insertion feeder 9 (FIG. 1) places a sheet metal part 18 on the sheet metal holder 30 (FIGS. 3 and 4) in the drawing apparatus 20. The lowering movement of the sheet metal holder 30 begins with the pre-acceleration phase for the transition to the movement of the plunger 3, curve 22. Sheet metal part 18 and sheet holder 30 are lowered by the upper tool part 6 descending with the ram - drawing phase. After bottom dead center 25 has been reached, the drawing apparatus with sheet metal holder 30 briefly follows the rising plunger 3 and upper tool part 6. However, the known blocking measures can already delay the start of the sheet metal holder when the plunger starts up. The sheet metal holder 30 following the plunger 3 in its run-up movement lifts the sheet metal part 18 out of the lower tool part 7 to such an extent that it can be grasped by the suction bridge 10 with the suction means 17. For the transfer of the sheet metal part 18 to the suction means 17, the sheet holder 30 is temporarily prevented from further upward movement. Depending on the tool or drawing depth, the press control can be used to hold the drawing apparatus 20 with the sheet metal holder 30 at a removal height 26, at a removal height 27, at a removal height 28 or at any other removal height for suction bars 10 indicated by positions 26 to 28 and sheet metal part 18 take place. After the pulling device 20 has been temporarily stopped in one of the predeterminable removal positions 26, 27, 28, the pulling device 20 is to be raised into the insertion position 23 or into the insertion position 24 in accordance with the curve specification 29.

Fig. 3 zeigt einen Bereich zwischen zwei (vier) Pressenständern 4, beispielsweise die erste, in Fig. 1 angedeutet dargestellte Bearbeitungsstufe. Die Bearbeitungsstufe ist als Ziehstufe ausgeführt und weist hierfür einen Ziehapparat 20 auf mit über eine Traverse 32 gestellfest angebrachten Ziehzylindern 31. Die Ziehzylinder 31 sind über Ventile 33 diskret mit Druck beaufschlagbar, d.h. jeder Ziehzylinder 31 ist einzeln im Sinne einer aktiven oder einer passiven Druckvorgabe ansteuerbar. Die Ziehzylinder 31 wirken mit den Kolbenstangen 36, im Fall der außen angeordneten Ziehzylinder 31 über Druckbolzen 37, auf axial zu diesen gehaltene Druckbolzen 39. Diese Druckbolzen 39 wirken über Druckstifte 40, 42 auf den Blechhalter 30 in dem Werkzeugunterteil 7. Kennziffer 5 verweist auf einen Schiebetisch, Kennziffer 6 auf das Werkzeugoberteil und Kennziffer 8 auf die Umsetzeinrichtung für die vermittels Saugerbalken 10 und Saugermittel 17 von dem Blechhalter 30 abnehmbaren Blechteile 18. Über Bunde 38 an den Druckbolzen 37 wird eine ansonsten heb- und senkbare Konsole 34 abgestützt.FIG. 3 shows an area between two (four) press stands 4, for example the first processing stage shown in FIG. 1. The processing stage is designed as a drawing stage and for this purpose has a drawing apparatus 20 with drawing cylinders 31 which are fixed to the frame via a crossmember 32. The drawing cylinders 31 can be pressurized discretely via valves 33, ie each drawing cylinder 31 can be individually controlled in terms of an active or a passive pressure specification . The drawing cylinders 31 act with the piston rods 36, in the case of the externally arranged drawing cylinders 31 via pressure bolts 37, on pressure bolts 39 held axially to them. These pressure bolts 39 act via pressure pins 40, 42 on the sheet metal holder 30 in the lower tool part 7. Reference number 5 refers to a sliding table, reference number 6 to that Tool upper part and code number 8 on the conversion device for the sheet metal parts 18 that can be removed from the sheet metal holder 30 by means of suction bars 10 and suction means 17. An otherwise raisable and lowerable bracket 34 is supported by collars 38 on the pressure bolts 37.

Wird die Konsole an einer Bewegung gehindert, ist auch die Bewegung der Kolbenstangen 36 der Ziehzylinder 31 und somit die Anhebebewegung des Blechhalters 30 unterbunden. Der Blechhalter 30 ist um z.B. 30 mm angehoben dargestellt worden, das einer Entnahmeposition 26 oder 27 oder 28 in Fig. 2 entsprechen kann. In dieser Position ist das Blechteil 18 von den Saugermitteln 17 des Saugerbalkens 10 von dem Blechhalter 30 abnehmbar und in die mit 18¹ angedeutete Transporthöhe anhebbar. Die Konsole 34 ist über Stehbolzen 41 mit einer Hubbrücke 47 starr verbunden. Auf der Hubbrücke 47 sind Spindeln 44 aus dieser heraus- und in diese hineinschraubbar gelagert. Die Spindeln 44 wirken mit Anschlagzylindern 45 zusammen, die über einen Tragholm 43 gestellfest sind. Die detaillierte Anordnung wird nachfolgend zu Fig. 5 näher erläutert. Die Anschläge sind insgesamt mit 35 positioniert und bewirken durch deren Spindeln 44 die Einstellung unterschiedlicher Entnahmepositionen 26, 27, 28.If the console is prevented from moving, the movement of the piston rods 36 of the drawing cylinders 31 and thus the lifting movement of the sheet metal holder 30 are also prevented. The sheet holder 30 is e.g. 30 mm raised, which may correspond to a removal position 26 or 27 or 28 in Fig. 2. In this position, the sheet metal part 18 can be removed from the sheet holder 30 by the suction means 17 of the suction bar 10 and raised to the transport height indicated by 18 1. The console 34 is rigidly connected to a lifting bridge 47 by means of stud bolts 41. Spindles 44 are mounted on the lifting bridge 47 and can be screwed into it. The spindles 44 cooperate with stop cylinders 45, which are fixed to the frame via a support bar 43. The detailed arrangement is explained in more detail below in relation to FIG. 5. The stops are positioned at a total of 35 and, through their spindles 44, bring about the setting of different removal positions 26, 27, 28.

Hinsichtlich der Höheneinstellung des Blechhalters 30 zeigt Fig. 4 eine gleiche, wie in Fig. 3 gezeigte Anordnung der Anschläge 35. Die Ziehzylinder 31 des Ziehapparats 20 wirken über ihre Kolbenstangen 36 und Druckbolzen 37 sowie Druckbolzen 39 auf eine Druckwange 46. Auf der Druckwange 46 stützen sich Druckstifte 40 ab, die von unten gegen den Blechhalter 30 im Werkzeugunterteil 7 gelegt sind und diesen bereits in eine der Entnahmepositionen 26, 27, 28 für ein Blechteil 18 angehoben hat. Die weiteren Positionsziffern entsprechen baugleichen bzw. funktionsgleichen Teilen wie zu Fig. 3.With regard to the height adjustment of the sheet metal holder 30, FIG. 4 shows the same arrangement of the stops 35 as shown in FIG. 3. The drawing cylinders 31 of the drawing apparatus 20 act on a pressure cheek 46 via their piston rods 36 and pressure bolts 37 and pressure bolts 39. On the pressure cheek 46 support push pins 40 which are placed from below against the sheet metal holder 30 in the lower tool part 7 and which has already been raised into one of the removal positions 26, 27, 28 for a sheet metal part 18. The other item numbers correspond to identical or functionally identical parts as in FIG. 3.

Fig. 5 zeigt ausschnittsweise den Anschlagbereich für die in den Fig. 3 und 4 gezeigte Konsole 34. Es ist ein linker Anschlag 35L dargestellt; ein rechter Anschlag 35R ist nur angedeutet worden, um die Ansicht auf einen insgesamt mit 59 positionierten Hochbringer-Endanschlag zu ermöglichen. Die Anschläge 35 ( 35L, 35R) weisen je eine Spindel 44 auf. Die Spindel 44 ist in einer Gewindebuchse 48 in der Hubbrücke 47 drehbeweglich gelagert und somit aus dieser heraus- und in diese hineinschraubbar. Der Endteil 55 der Spindel 44 wirkt mit dem Kolben 56 eines Anschlagzylinders 45 zusammen. Der Druckraum 57 des Anschlagzylinders 45 ist über eine Druckleitung 58 mit Druckmedium entsprechend dem Schaltungsaufbau in Fig. 6 auffüllbar. Ist der Druckraum 57 druckbeaufschlagt, befindet sich der Kolben 56 in seiner unteren Endstellung und es wird ein Abstand (Spalt) 67 zwischen dessen Unterseite und dem gegenüber befindlichen Endteil 55 gebildet, der es ermöglicht, die Hubbrücke 47 um dieses Maß vermittels der Ziehzylinder 31 (Fign. 3 und 4) anzuheben.FIG. 5 shows a section of the stop area for the console 34 shown in FIGS. 3 and 4. A left stop 35L is shown; a right stop 35R has only been hinted at to To enable a view of a high stop end stop positioned with a total of 59. The stops 35 (35L, 35R) each have a spindle 44. The spindle 44 is rotatably mounted in a threaded bush 48 in the lifting bridge 47 and can thus be screwed out of and into the latter. The end part 55 of the spindle 44 interacts with the piston 56 of a stop cylinder 45. The pressure space 57 of the stop cylinder 45 can be filled with pressure medium via a pressure line 58 in accordance with the circuit structure in FIG. 6. If the pressure chamber 57 is pressurized, the piston 56 is in its lower end position and a distance (gap) 67 is formed between its underside and the opposite end part 55, which makes it possible to lift the lifting bridge 47 by this amount by means of the pulling cylinder 31 ( 3 and 4).

Die Spindel 44 weist in ihrem oberen, dem Endteil 55 nahen Bereich eine Nut 49 auf. In die Nut ist eine Paßfeder 50 eingeführt, die in einer Bundbuchse 51 gehalten ist. Auf die Bundbuchse 51 ist ein Zahnrad einer Zahnradpaarung 52 aufgesetzt. Die Zahnradpaarung 52 ist von einem in einem Haltewinkel 54 gestellfest gehaltenen Motor 53 im Drehsinn beaufschlagbar. Die Drehung der Bundbuchse 51 mit Paßfeder 50 bewirkt durch Mitnahme der Spindel 44 eine Änderung des Spaltes 67 zwischen Kolben 56 und Endteil 55 der Spindel 44. Der Spalt 67 ist somit maßgebend für die Entnahmepositionen 26, 27 oder 28 oder jedes Zwischenmaß des hochgeführten Blechhalters 30.The spindle 44 has a groove 49 in its upper region near the end part 55. A key 50 is inserted into the groove and is held in a collar bushing 51. A gear wheel of a gear pair 52 is placed on the flange bushing 51. The gear pair 52 can be acted upon in the direction of rotation by a motor 53 which is fixed to the frame in a mounting bracket 54. The rotation of the collar bushing 51 with feather key 50 causes a change in the gap 67 between the piston 56 and the end part 55 of the spindle 44 by driving the spindle 44. The gap 67 is thus decisive for the removal positions 26, 27 or 28 or any intermediate dimension of the raised sheet metal holder 30 .

Die Höhe 23, 24 in Fig. 2 des Blechhalters 30 für das Einlegen eines neuen Blechteils 18 ist durch Drehung der Spindel 60 des Hochbringeranschlags 59 einstellbar.The height 23, 24 in FIG. 2 of the sheet metal holder 30 for inserting a new sheet metal part 18 can be adjusted by rotating the spindle 60 of the feeder stop 59.

Gemäß dem Schaltplan in Fig. 6 sind die Druckräume 57 der Anschlagzylinder 45 über die Druckleitung 58 und Wegeventile 62 bzw. 63 mit einer Niederdruckquelle 65 mit großer Volumenförderung oder / und einer Hochdruckquelle 66 verbindbar. Über das Proportional-Wegeventil 64 ist der Kurvenverlauf 29 (Fig. 2), demgemäß die Hochlaufbewegung des Blechhalters 30 nach der Entnahme des Blechteils 18 einstellbar.According to the circuit diagram in FIG. 6, the pressure spaces 57 of the stop cylinders 45 can be connected via the pressure line 58 and directional valves 62 or 63 to a low-pressure source 65 with large volume delivery and / or a high-pressure source 66. The curve shape 29 (FIG. 2), and accordingly the run-up movement of the sheet metal holder 30 after the sheet metal part 18 has been removed, can be adjusted via the proportional directional valve 64.

Claims (2)

  1. Press with at least one ram (3) and press platen (5) for die top and bottom parts (6, 7), with a transfer device (8) for transporting sheet-metal parts (18) through the press and with a drawing device (20) having frame-fixed drawing cylinders (31), the piston rods (36) of which can be loaded so as to be lowerable during the forming of the sheet-metal parts (18) by means of the ram movement (22) and so as to be raisable for lifting out the sheet-metal parts (18) from the die bottom part (7) and, at the same time, act from below on a die-side sheet holder via a raisable and lowerable cantilever (34) as well as thrust bolts (37, 39) and thrust pins (40), and with press-fixed stops (35), which can be set in the stop position and can be removed in a controlled manner and which act on the cantilever (34), with the result that the cantilever (34), after running through the bottom dead centre (25) of the ram (3) and drawing apparatus (20), can in the meantime be halted, in an extraction position determinable via the stops (35), in a manner dependent on the ram travel or on the angle of rotation, characterized in that the piston rods (36) are guided through the cantilever (34) via thrust bolts (37, 39) and are laid from below against the die-side sheet holder (30) selectively by the interposition of the thrust pins (40), otherwise by the interposition of a thrust cheek (46) and the thrust pins (40), and in that the thrust bolts (37) have collars (38), on which the cantilever (34) is supported.
  2. Press according to Claim 1, characterized by a cantilever (34) which can be raised and lowered underneath the sheet holder (30) and against which the drawing cylinders (31) are laid from below via collars (38), by a lifting bridge (47) which is connected rigidly to the cantilever (34), by at least one further pressframe-fixed stop cylinder (45) with a pressure space (57) located above its piston (56) and with a valve control (62, 63, 64) for the flow connection of the pressure space (57) selectively to a pressure source (65, 66) or to a proportional valve (64), and by at least one spindle (44) which is rotatably mounted in a threaded bush (48) fastened in the lifting bridge (47) and is adjustable for bearing on that side of the piston (56) of the stop cylinder (45) facing away from the pressure space (57).
EP92107829A 1991-05-25 1992-05-09 Press with drawing device Expired - Lifetime EP0515881B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4117102 1991-05-25
DE4117102A DE4117102A1 (en) 1991-05-25 1991-05-25 PRESS WITH DRAWING DEVICE

Publications (2)

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EP0515881A1 EP0515881A1 (en) 1992-12-02
EP0515881B1 true EP0515881B1 (en) 1996-01-10

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EP92107829A Expired - Lifetime EP0515881B1 (en) 1991-05-25 1992-05-09 Press with drawing device

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US (1) US5253505A (en)
EP (1) EP0515881B1 (en)
DE (2) DE4117102A1 (en)
ES (1) ES2084209T3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324963A1 (en) * 1993-07-24 1995-01-26 Erfurt Umformtechnik Gmbh Sheet holder for single-acting presses, especially for mechanical presses and transfer presses
DE4403954B4 (en) * 1994-02-08 2006-02-02 Müller Weingarten AG Multipoint drawing device of mechanical and hydraulic presses
US6848290B2 (en) * 2002-10-10 2005-02-01 Pyper Tool & Engineering, Inc. Stock lifter for metal forming dies and method for making the same
DE10336279A1 (en) 2003-08-07 2005-03-03 Bosch Rexroth Ag Device for controlling the drawing process in a transfer press
DE102017214660B4 (en) * 2017-08-22 2022-12-15 Bayerische Motoren Werke Aktiengesellschaft Pressure bolt of a press and press with pressure bolt
US11267036B2 (en) 2018-12-27 2022-03-08 Standard Lifters, Inc. Stock lifter assembly
US11707775B2 (en) 2018-12-27 2023-07-25 Standard Lifters, Inc. Stock lifter assembly

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1742877A (en) * 1929-03-18 1930-01-07 Fredrich J Rode Sheet-metal press
DE656684C (en) * 1935-06-22 1938-02-12 Weingarten Vorm Hch Schatz A G Locking device for the return of compressed air bouncing devices on sheet metal drawing presses
DE1246652B (en) * 1962-02-10 1967-08-10 Mueller Fritz Transfer press
US4566306A (en) * 1983-03-17 1986-01-28 Yugengaisha Kyodogiken Method and apparatus for feeding materials to be pressed
DE3505984A1 (en) * 1985-02-21 1986-08-21 L. Schuler GmbH, 7320 Göppingen DRAWER ON PRESSES
DE3702069A1 (en) * 1987-01-24 1988-08-04 Schuler Gmbh L DRAWER IN A PRESS
DE3807683A1 (en) * 1988-03-09 1989-09-21 Schuler Gmbh L Drawing apparatus in drawing stages of presses
DE3933806A1 (en) * 1989-10-10 1991-11-14 Schuler Gmbh L DRAWER IN DRAWING STAGES OF PRESSES

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DE59204976D1 (en) 1996-02-22
US5253505A (en) 1993-10-19
EP0515881A1 (en) 1992-12-02
DE4117102A1 (en) 1992-11-26
ES2084209T3 (en) 1996-05-01

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