EP0564977B1 - Réglage de période d'accélération pour une jumelle de pression à un appareil d'étirage - Google Patents

Réglage de période d'accélération pour une jumelle de pression à un appareil d'étirage

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Publication number
EP0564977B1
EP0564977B1 EP93105393A EP93105393A EP0564977B1 EP 0564977 B1 EP0564977 B1 EP 0564977B1 EP 93105393 A EP93105393 A EP 93105393A EP 93105393 A EP93105393 A EP 93105393A EP 0564977 B1 EP0564977 B1 EP 0564977B1
Authority
EP
European Patent Office
Prior art keywords
pressure
control
piston
press
stop
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
EP93105393A
Other languages
German (de)
English (en)
Other versions
EP0564977A1 (fr
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
Original Assignee
L Schuler GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by L Schuler GmbH filed Critical L Schuler GmbH
Publication of EP0564977A1 publication Critical patent/EP0564977A1/fr
Application granted granted Critical
Publication of EP0564977B1 publication Critical patent/EP0564977B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—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 run-up control for the pressure cheek of a drawing apparatus in a press according to the preamble of claim 1 (DE-A-4 032 338).
  • step presses multi-step presses, hybrid press systems and the like.
  • Forming presses to increase the number of cycles, it is necessary for the formed sheet metal parts to be grasped by the transfer device directly after opening the tool, and thus before the initial height of the pressure cheek is reached. To do this, interrupt the upward movement of the pressure cheek.
  • DE 40 32 338 A1 describes a drawing apparatus of a drawing stage in a press with a pressure cheek for sheet metal holding when drawing.
  • the pressure cheek can be acted on from below by pressure cylinders.
  • Locking cylinders are provided for an intermediate stop when the workpieces are brought up.
  • the piston rods engage on a bracket that can be raised and lowered, which is common to all push rods.
  • Locking cylinders act on the console, the pistons of which can be controlled away for a further run-up of the pressure cheek.
  • a press control with a pressure control device is known from EP 0 151 198 B1.
  • the press control generates signals on amplifier units for the basic pressure settings depending on the tool and for the pressure settings during the operation of the press.
  • both the tool-specific, cheapest removal heights when the pressure cheek is at a standstill Start-up phase can be adjustable as well as be ensured that the removal height to be set can be reached by regulation even with different drawing device pressures.
  • Claim 2 represents a favorable embodiment according to the invention.
  • the pre-acceleration cylinder which is present anyway, can advantageously be used for the run-up control, in which the amount of fluid displaced from it under pressure of the drawing apparatus after the shaping displaces a control piston which can be controlled in its subsequent movement.
  • Another advantage is the possibility of adjusting a volume compensation via the stop setting depending on the different drawing pressure according to e.g. every tool change.
  • pressure compensation can take place as a function of the pressure in the drawing apparatus.
  • the drawing apparatus preferably a compressed air drawing device, has a pressure cheek 2 which interacts with pressure bolts on the tool side and, via these, with a sheet metal holder in the tool.
  • a piston rod 3 connects pistons 5 in pressure chambers 6 of pressure cylinders 4 to the pressure cheek 2 here in order to apply the sheet metal holder and ejector forces and movements.
  • the piston rod 3 is extended and interacts with a run-up stop control 7. These serves to set the initial height for the pressure cheek 4, positioned in FIG. 2 with 22 or 23.
  • a pressure piston 8 also cooperates with the piston rod 3 in a pressure chamber 9.
  • the pressure piston 8 has an active surface 20. During the decline of the tappet according to curve 21 in FIG.
  • the pressure cheek is lowered in the direction of drawing 19 by pressurizing the pressure chamber 9 via a valve 17 from a pressure source before the upper tool part hits the tappet on the sheet metal part resting on the sheet metal holder in the lower tool part the curve transition from curve 22 or 23 into curve course 21 in FIG. 2.
  • a pressure chamber 9 with the pressure piston 8 and the active surface 20 for regulating the run-up and for stopping - downtime of the pressure cheek 2 - in the run-up phase used for the earliest possible removal of the sheet metal part by suction means 29, 30 of a transfer system (FIG. 2).
  • the invention is not limited to the presence of a pre-acceleration cylinder.
  • the pressure in the pressure chambers 6 of the pressure cylinders 4 tries to move the pressure cheek 2 with the piston 8 and the piston rod 3 upwards when the forming (drawing) has been reached after bottom dead center 24, shown as curve shape 21 in FIG. 2 after bottom dead center 24 until the transition to the downtimes 25, 26, 27.
  • the downtimes are generated by means of the devices 10, 15, 16, 41 described below.
  • the valve 17 is opened again in order to allow the fluid which has not been displaced into a first pressure chamber 12 of the pressure cylinder to escape.
  • the control into the idle times shown with 25, 26, 27 in FIG. 2 when the pressure cheek 2 starts up is effected with the valve 17 closed by the control cylinder 10, an adjustment drive 16 and a pressure source 15 with a pilot valve 18.
  • the control piston 11 divides the pressure chamber of the control cylinder 10 into a first pressure chamber 12 which is in constant flow communication with the pressure chamber 9 via a pressure line 13 and into a second pressure chamber 14 which can be connected to the pressure source 15 via the pilot valve 18.
  • the piston rod 42 has one fixed stop 34 against the pressure source 15 when the pressure chamber 14 is pressurized a stop on a threaded sleeve 33 is moved.
  • the threaded sleeve 33 has an external thread which interacts with an internal thread of a worm wheel 32 screwed onto the threaded sleeve 33 in the manner of a nut-spindle connection.
  • the worm wheel 32 can be driven in rotation by a motor-driven worm 31.
  • the motor not shown, as the actuating means of the worm 31, as well as the pilot valve 18, are connected to the press control, as indicated by 41 in FIG. 1.
  • the position of the worm, worm wheel or threaded sleeve 33 can be queried via an encoder with a signal return to the press control.
  • the position of the piston 11 in the control cylinder 10 when the pressure chamber 14 is pressurized from the pressure source 15 is determined by the abutment of the stop 34 on the threaded sleeve 33 and its position.
  • the values determined on the press when a tool is first set up are assigned to each tool in terms of storage technology and can be specified via the press control.
  • the downtimes 25 and 27 in FIG. 2 are considered in more detail as examples for the solution of the object set according to the invention.
  • the downtime or removal height 27 is achieved according to FIG. 4 by generating a second pressure chamber 14 with a large volume with a corresponding stop control of the piston rod 42.
  • a smaller second pressure chamber 14 is to be provided for an initially smaller path of the drawing device 1 with pressure cheek 2 until a workpiece is removed.
  • This can be adjusted via the stop control of the piston rod 42 by means of gear train 31-34.
  • the respective control piston position 35 for the first and 38 for the second example is reached with a corresponding stop specification and open pilot valve 18 and thus pressurization of the second pressure chamber 14.
  • the valve 17 is to be controlled closed.
  • the valve 18 is to be switched so that the second pressure chamber 14 can empty. From the previous illustration, it can be seen that, for example in the case of a greater drawing depth with a corresponding tool, a larger piston travel of the control piston 11 according to FIG. 4 is to be provided in order to be able to remove the workpiece after opening the tool.
  • the way is here predetermined by the distance of the piston surface 35 up to the stop in the bottom of the control cylinder 10.
  • a small distance between the piston surface 38 and the stop in the bottom of the control cylinder 10 is predetermined in accordance with the downtime 25 (removal height) which starts earlier in terms of time and path.
  • control measures continue to take into account different drawing or sheet holder pressures.
  • a larger pulling pressure causes a greater compression of the fluid and a greater expansion of the fluid-carrying system and vice versa.
  • the piston 11 is to be held in position 40 by means of a stop for a lower drawing pressure in position 39.
  • the pressure cheek 2 follows the ram run-up with a time delay. A volume adjustment in the sense of the examples in FIGS. 4 and 5 required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Control Of Presses (AREA)

Claims (2)

  1. Dispositif de commande de l'élévation de la joue de pression (2) dans un appareil d'étirage (1) d'une presse, comportant un poussoir pouvant se déplacer vers le haut et vers le bas, un élément de maintien de la tôle, dont la force de maintien et d'éjection s'exerçant sur la tôle est générée par un ou plusieurs vérins de poussée (4) disposés en dessous de la joue de pression (2), la joue de pression (2) étant liée de manière fonctionnelle, dans le sens de l'étirage, à une surface active (20) pouvant être mise sous pression, par l'intermédiaire d'au moins une tige de piston (3) liée à un piston de compression (8) logé dans une chambre de pression (9), dans lequel, la chambre de pression (9) peut être remplie à partir d'un réservoir, à travers une commande à soupape, et avec un dispositif de commande de la presse pour le réglage de la pression des consommateurs de pression de la presse, caractérisé en ce que la chambre de pression (9) associée à la surface active (20) du piston de compression (8) communique de façon permanente avec une première chambre de pression (12) de deux chambres de pression (12, 14) séparées, par l'intermédiaire d'un piston de commande (11) d'un vérin de commande (10), en ce que la seconde (14) des chambres de pression (12, 14) peut communiquer avec un générateur de pression (15) à travers une soupape de pré-commande (18), en ce que la, respectivement les entrées de commande (41) de la soupape de pré-commande (18) est reliée à la commande de la presse, ou peut être pilotée par elle, en ce que la tige de piston (42) du piston de commande (11) qui s'étend hors du vérin de commande (10) est pourvue d'une butée (34), cette butée étant en appui contre une butée réglable (33) disposée dans le prolongement de la tige de piston (42) lorsque la deuxième chambre de pression (14) est mise sous contrainte par l'ouverture de la soupape de commande (18), et ladite butée réglable (33) étant fonctionnellement liée à un entraînement de réglage (31) activé par la commande de la presse.
  2. Dispositif de commande selon la revendication 1, caractérisé en ce que l'entraînement de réglage activé par la commande de la presse agit par l'intermédiaire d'une vis sans fin (31) sur une roue de vis sans fin (32) et en ce que la butée (33) et la roue de vis sans fin (32) couplent en translation la butée (33) et la tige de piston (42) à la manière d'un entraînement à vis et écrou.
EP93105393A 1992-04-07 1993-04-01 Réglage de période d'accélération pour une jumelle de pression à un appareil d'étirage Expired - Lifetime EP0564977B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4211639A DE4211639A1 (de) 1992-04-07 1992-04-07 Hochlaufsteuerung für die Druckwange in einem Ziehapparat
DE4211639 1992-04-07

Publications (2)

Publication Number Publication Date
EP0564977A1 EP0564977A1 (fr) 1993-10-13
EP0564977B1 true EP0564977B1 (fr) 1996-12-27

Family

ID=6456288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93105393A Expired - Lifetime EP0564977B1 (fr) 1992-04-07 1993-04-01 Réglage de période d'accélération pour une jumelle de pression à un appareil d'étirage

Country Status (5)

Country Link
US (1) US5357844A (fr)
EP (1) EP0564977B1 (fr)
CZ (1) CZ282707B6 (fr)
DE (2) DE4211639A1 (fr)
ES (1) ES2097384T3 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1920969B2 (de) * 1969-04-24 1975-04-30 Mannesmann Pulvermetall Gmbh, 4050 Moenchengladbach Hubbegrenzung in einer hydraulischen Metallpulverpresse
FR2220699B1 (fr) * 1973-03-09 1978-03-10 Commissariat Energie Atomique
US3958493A (en) * 1973-08-20 1976-05-25 Tokico Ltd. Multiple-stage actuating device
EP0151198B1 (fr) * 1984-02-03 1989-01-04 L. SCHULER GmbH Dispositif de réglage de pression dans des presses
DE3602236A1 (de) * 1986-01-25 1987-07-30 Mueller Weingarten Maschf Pneumatische zieheinrichtung fuer einfach- oder doppeltwirkende pressen
DD267926B5 (de) * 1987-12-14 1994-03-10 Erfurt Umformtechnik Gmbh Rueckzugssteuerung fuer ziehkissen an pressen
DE3744177A1 (de) * 1987-12-24 1989-07-06 Audi Ag Verfahren zum tiefziehen von platinen, insbesondere von tiefziehblechen fuer karosserieelemente von kraftfahrzeugen
US5009673A (en) * 1988-11-30 1991-04-23 The General Electric Company Method for making polycrystalline sandwich compacts
DE3915795C1 (fr) * 1989-05-13 1991-01-31 Maschinenfabrik Mueller-Weingarten Ag, 7987 Weingarten, De
DE4032338A1 (de) * 1989-10-10 1991-04-25 Schuler Gmbh L Ziehapparat in ziehstufen von pressen

Also Published As

Publication number Publication date
DE4211639A1 (de) 1993-10-14
EP0564977A1 (fr) 1993-10-13
ES2097384T3 (es) 1997-04-01
CZ282707B6 (cs) 1997-09-17
US5357844A (en) 1994-10-25
CZ59893A3 (en) 1993-11-17
DE59304850D1 (de) 1997-02-06

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