EP0192115B1 - Appareil d'étirage pour presses - Google Patents

Appareil d'étirage pour presses Download PDF

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Publication number
EP0192115B1
EP0192115B1 EP86101399A EP86101399A EP0192115B1 EP 0192115 B1 EP0192115 B1 EP 0192115B1 EP 86101399 A EP86101399 A EP 86101399A EP 86101399 A EP86101399 A EP 86101399A EP 0192115 B1 EP0192115 B1 EP 0192115B1
Authority
EP
European Patent Office
Prior art keywords
pressure
cylinders
auxiliary
regulating
drawing apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86101399A
Other languages
German (de)
English (en)
Other versions
EP0192115A2 (fr
EP0192115A3 (en
Inventor
Gerhard Roos
Hartmut Dexling
Wolfgang Michael
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 EP0192115A2 publication Critical patent/EP0192115A2/fr
Publication of EP0192115A3 publication Critical patent/EP0192115A3/de
Application granted granted Critical
Publication of EP0192115B1 publication Critical patent/EP0192115B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders

Definitions

  • the invention relates to a drawing device on presses according to the preamble of claim 1, such as. B. has become known from DE-C-32 02 134.
  • Drawers are used to generate the sheet metal holding force during sheet metal forming (drawing) and to generate the ejector movement (raising) of the shaped workpiece in presses and transfer presses.
  • Drawers have a pressure cheek, which is displaced by moving the press ram into bottom dead center - end area of the forming process - via pressure rods with the application of the sheet metal holding force and follows the movement of the ram into top dead center - the area away from the tool - taking the formed workpiece with it.
  • the force of the drawing device, while the pressure cheek follows the movement of the ram into the top dead center is approximately the same as the sheet metal holding force during workpiece forming.
  • the workpieces are pressed against the upper part of the tool when they are ejected via the push rods and can be deformed.
  • a drawing apparatus is used to avoid the deformation of the workpieces with a pressure cheek that follows the movement of the ram in its top dead center.
  • the press ram presses the pressure cheek into the bottom dead center as in the uncontrolled pulling process.
  • a hydraulic locking device is activated, which allows the pressure cheek with the workpiece to follow the movement of the ram into top dead center.
  • the next forming process - renewed movement of the press ram to the bottom dead center - can only take place after the workpiece has been removed and a new sheet metal blank has been inserted, so that there is a low output rate in drawing devices of this type.
  • DE-C-32 02 134 provides a pulling device in which the pulling force is separated from the ejector force.
  • the ejector follows the movement of the tappet with less force, corresponding to a smaller displaced volume in the ejector cylinders, while the pressure cylinder for the pulling function is initially prevented by a follow-up control device from moving to the top dead center following the movement of the tappet.
  • other measures such as. B. introduced in the upper part of the pacifier, required.
  • the invention has for its object to provide a drawing apparatus in which the individual functions - control of the sheet metal holder (drawing) pressure, control of the sheet metal holder upward movement, control of the ejector (bringer) upward movement and control of the end position stop - can be set or controlled independently of each other.
  • the workpiece and drawing apparatus are coupled via the sheet metal holder, the pressure rods and the pressure cheek only by gravity.
  • the pulling device enables the upward movement of the pressure cheek or the pressure rods to be delayed to eject less than 1 g.
  • the remaining velocity is below 0.1 m / sec. adjustable so that the workpieces can be detected by the workpiece transfer device when it is at a standstill directly after the ejector movement has been completed.
  • the adjustment measures of the single functions do not influence each other.
  • the pressure in the individual support points of the sheet metal holder can also be set differently from one another.
  • the arrangement of the pressure cylinders and the auxiliary cylinders on a common press-fixed bracket and the lifting (releasing) of the pressure cheek for ejecting the piston rods which cause the sheet metal holding during the drawing serve to improve the control of the ejection of the workpieces and the good adjustability of the drawing and ejection processes.
  • the drawing device can be fully automatically adjusted to other workpiece shapes and thicknesses of the sheet metal blanks.
  • the arrangement of the components of the overrun control devices to form functional blocks and in the areas close to the cylinder avoids moving pressure lines of large cross-sections, and also creates shorter flow paths and shorter switching times.
  • the drawing apparatus shown as an example in the drawing shows in its construction a pressure cheek 1 which is movable in sliding guides 2.
  • the slide guides 2 are located on the pressure cheek 1 and in the table of a press, step press and the like.
  • z. B a drawing station for forming flat sheet metal blanks.
  • the pressure rods 15 indicated above the pressure cheek 1 transmit the sheet metal holding force and the ejector movement to the lower tool part lying on the press table.
  • the pressure cheek 1 is supported by means of piston rods 6, 7 and by means of ball sockets 3 and spherical caps 4 inserted between pressure cheek 1 and piston rods 6, 7 in the direction of the arrows 14.
  • the piston rods 6 can be detached from the underside of the pressure cheek 1 and the pressure cheek 1 can be brought up without it into a raised position (top dead center), which corresponds to the removal position for the workpieces.
  • the pressure cylinders 8, 9 are installed above a press-fixed bracket 11 fastened in the press table.
  • the auxiliary cylinders 16, 17 are installed below the bracket 11 and coaxially with the associated pressure cylinder 8, 9.
  • the piston rods 6, 7 are also led out from the respective pressure cylinder 8, 9 on the underside and through the bracket 11 and the associated auxiliary cylinder 16, 17.
  • the piston rods 6, 7 thus interact with pistons 12, 13 in the pressure cylinders 8, 9 and with pistons 18, 19 in the auxiliary cylinders 16, 17.
  • the console 11 accommodates the control block 20 for overrun control devices 48, 49, which will be described in detail below.
  • the representation of the overrun control devices 48, 49 has priority.
  • the pistons 18, 19 which are displaceable in the auxiliary cylinders 16, 17 are mounted so as to be adjustable in the direction of the longitudinal axis thereof via a movement thread on a threaded attachment 32 in the end part 23, 24 of the piston rod 6 or 7.
  • a worm wheel 28 can be rotated into the wall of each auxiliary cylinder 16, 17 and cannot be displaced axially relative to the piston rod 6, 7, each worm wheel 28 being operatively connected to one of the pistons 18, 19 in the manner via a feather key 29 and a longitudinal groove 31, that when a rotary shaft 27 and the screw, not shown, attached to it, is rotated by an actuator 26, the axial position of the pistons 18, 19 in the auxiliary cylinders 16, 17 is adjusted with respect to the piston rod 6 and 7, respectively, so that the end position of the Adjust piston rods 6, 7 with respect to their top dead center.
  • An actuator 36, 37 is carried along with the pistons 18, 19 in the direction of the movement of the piston rods 6, 7.
  • the actuators 36, 37 are placed on control cams 38, 39 on mechanically actuable valves 52, 54 and are guided in the area of their control cams 38, 39 in the bracket 11 - hatched surface sections.
  • the piston rods 6, 7 are secured against rotation by keys 33 held in the cylinder covers 34 and guided in longitudinal grooves 41 of the end parts 23, 24 of the piston rods 6, 7.
  • the force required for sheet metal holding during drawing is to be applied in the pressure cylinders 8 and in some cases also in the pressure cylinder 9 via the pre-set pressure gas boilers 45, 46, 47.
  • the pressure in the pressure gas boilers 45, 46, 47 and the pressure chambers 5 and 10 leads without a follow-up control to the direct running of the pressure cheek 1 on the press ram moved back to the top dead center.
  • the pressure cylinders 8, 9 are connected via the pressure chambers 21, 22 of the auxiliary cylinders 16, 17 overrun control devices 48, 49, which cause the piston rods 6 and 7 to start up at different times to move the tappet to the top dead center. Due to the different design (equipping) of the follow-up control devices 48 and 49, a separation of the (deliverer) ejector process by means of the pressure in the pressure chamber 10 of the printing cylinder 9 from the run-up of the printing cylinders 8, which largely effect the sheet metal holding, is possible.
  • a control throttle 53 which adjusts its opening cross-section under the secondary pressure of the valve 54 (adjusting throttle) which opens mechanically via the control cam (39).
  • the secondary pressure of the control throttle 53 is set by the control throttle 54 in accordance with the movement of the piston 19 via the control cam 39.
  • the pressure can, with an appropriate design of the curve shape in z. B. three stages can be set so that different flow cross sections and thus differently large flow quantities can be controlled with this two-way flow control. For example, the ejector force and speed in the first phase are possible with low throttle losses with the net output force of the compressed gas boiler 47.
  • the second phase can bring about a pressure build-up counteracting the pressure in the pressure chamber 10, which leads to the end of the frictional connection between the pressure cheek 1, pressure rods 15, ejector parts of the tool and press ram.
  • the third phase can be designed in such a way that the workpiece is brought into the removal position (transport plane) at a constant pressure by further closing the control throttle 54 and consequently increased secondary pressure at the control throttle 53, which value corresponds to less than 1 g.
  • Control throttle 53 and control throttle 54 form a two-way current control from their shown and functional structure.
  • a two-way flow control comprising a regulating throttle 59 and an adjusting throttle 60 connected in series to it is introduced, by means of which the piston rods 6 run up under the pressure in the pressure gas boilers 45, 46 jammed air pressure (adjustable) is controllable.
  • the point in time at which the regulation is started can be set via the check valve 52 actuated by the control cam 38.
  • a switching valve 44 is introduced into line 42, by means of which the pressure circuits of the individual pressure cylinders 8, which exert the pulling force, can be separated from one another.
  • the drawing back pressure in the individual drawing areas of a sheet metal holder on the tool side can thus be varied and adjusted to the drawing conditions by means of different air pressures in the pressure gas boilers 45, 46.

Landscapes

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

Claims (7)

1. Appareil d'étirage pour presses, comportant des vérins de poussée (8) pour le maintien des tôles pendant l'étirage, au moins un vérin de poussée (9) pour l'éjection des pièces travaillées, une plaque de poussée (1) qui est guidée dans la table de la presse et sollicitée par les vérins de poussée (8, 9) pour être élevée et abaissée, et un dispositif de réglage de retard (48) qui règle une montée retardée des vérins (8) assurant le maintien des tôles pendant l'étirage, quand le coulisseau de la presse remonte du point mort bas au point mort haut, caractérisé en ce qu'un vérin auxiliaire respectif (16, 17) est associé à chacun des vérins de poussée (8, 9), en ce que les vérins de poussée (8, 9) et les vérins auxiliaires (16, 17) sont montés sur une console (11) fixe dans la presse, en ce que les tiges de pistons (6) des vérins de poussée (8) sont détachables de la face inférieure de la plaque de poussée (1) à la montée de cette plaque (1) pour l'éjection des pièces et sont applicables à nouveau contre cette plaque (1) par-dessous pour le maintien des tôles, en ce que la tige de piston (6, 7) de chacun des vérins de poussée (8, 9) est reliée de manière active à un piston (18, 19) du vérin auxiliaire respectif (16, 17), et en ce que les chambres de travail (21, 22) situées au-dessus des pistons (18, 19) dans les vérins auxiliaires (16, 17) sont raccordées chacune à un dispositif respectif de réglage de retard (48, 49), réglable individuellement.
2. Appareil d'étirage pour presses selon la revendication 1, caractérisé en ce que les vérins de poussée (8) pour le maintien des tôles et les vérins de poussée (9) pour l'éjection sont disposés au-dessus de ladite console fixe (11), en ce que les vérins auxiliaires (16, 17) associés aux vérins de poussée (8, 9) sont disposés au-dessus de ladite console fixe (11) et coaxialement aux vérins de poussée (8, 9), en ce que les tiges de piston (6, 7) passent à travers la console (11) et à travers les vérins auxiliaires (16, 17), et en ce que les parties d'extrémité (23, 24) des tiges de pistons (6, 7) des vérins de poussée (8, 9) coopèrent avec des moyens de réglage de hauteur (18, 19, 26, 27, 28, 29, 32) qui sont communs à toutes lesdites parties d'extrémité.
3. Appareil selon la revendication 1, caractérisé en ce que les chambres de travail (5) des vérins de poussée (8) pour le maintien des tôles sont raccordées à un réservoir commun (46) de gaz comprimé à pression d'entrée réglable, en ce que la chambre de travail (10) du vérin de poussée (9) ou les chambres de travail (10) des vérins de poussée (9) pour l'éjection sont raccordées à un autre réservoir (47) de gaz comprimé à pression d'entrée réglable, et en ce que les chambres de travail (21, 22) des cylindres auxiliaires (16, 17) sont raccordées, chacune à travers son propre dispositif de réglage de pression (48, 49), à un accumulateur commun (51) de liquide hydraulique à pression d'entrée réglable.
4. Appareil selon la revendication 1, caractérisé en ce que les chambres de travail (5) des vérins de poussée (8) pour le maintien des tôles sont raccordées indépendamment l'une de l'autre à un réservoir respectif de gaz comprimé (45, 46) à pression d'entrée réglable séparément.
5. Appareil selon la revendication 1, caractérisé en ce que chacun des dispositifs de réglage de retard (48) raccordés aux chambres de travail (21) des vérins auxiliaires (16) associés aux vérins (8) de maintien des tôles est formé par une soupape de réglage de débit à deux voies, et en ce qu'une soupape de retenue (52) bloquant l'écoulement en direction de l'accumulateur hydraulique (51) est montée en parallèle à chacun des dispositifs de réglage de retard (48).
6. Appareil selon la revendication 5, caractérisé en ce que la chambre de travail (22) du vérin auxiliaire (17) associé au vérin déjection (9) est raccordée hydrauliquement à un accumulateur hydraulique (51) à travers un régulateur de débit à deux voies, en ce que ce régulateur de débit à deux voies se compose d'un étranglement de réglage (53) et d'un étranglement ajustable (54) qui sont montés en série, en ce que l'étranglement ajustable (54) est ajustable quant à sa section de passage au moyen d'un organe de commande (37, 39) entraîné par la tige de piston (7) du vérin de pression (9), et en ce qu'une soupape de retenue (55) bloquant l'écoulement en direction de l'accumulateur hydraulique (51) est montée en parallèle au régulateur de débit à deux voies.
7. Appareil selon la revendication 1, caractérisé en ce que le dispositif de réglage de retard (49) est un régulateur réduisant le débit en plusieurs phases en ce qui concerne ses conditions d'écoulement.
EP86101399A 1985-02-21 1986-02-04 Appareil d'étirage pour presses Expired EP0192115B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3505984 1985-02-21
DE19853505984 DE3505984A1 (de) 1985-02-21 1985-02-21 Ziehapparat an pressen

Publications (3)

Publication Number Publication Date
EP0192115A2 EP0192115A2 (fr) 1986-08-27
EP0192115A3 EP0192115A3 (en) 1987-09-16
EP0192115B1 true EP0192115B1 (fr) 1989-07-19

Family

ID=6263125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101399A Expired EP0192115B1 (fr) 1985-02-21 1986-02-04 Appareil d'étirage pour presses

Country Status (5)

Country Link
US (1) US4712412A (fr)
EP (1) EP0192115B1 (fr)
BR (1) BR8600714A (fr)
DE (2) DE3505984A1 (fr)
ES (1) ES8704094A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640507C3 (de) * 1986-11-27 1998-01-29 Mueller Weingarten Maschf Einrichtung zur Steuerung bzw. Regelung der Blechhalterkraft während des Ziehvorganges
DE3640788A1 (de) * 1986-11-28 1988-06-01 Schuler Gmbh L Zieheinrichtung fuer eine presse
DE3640787A1 (de) * 1986-11-28 1988-06-01 Schuler Gmbh L Zieheinrichtung fuer eine presse
CH671731A5 (fr) * 1987-02-13 1989-09-29 Sig Schweiz Industrieges
DE3718159A1 (de) * 1987-05-29 1988-12-15 Schuler Gmbh L Ziehapparat an pressen
DE3807683A1 (de) * 1988-03-09 1989-09-21 Schuler Gmbh L Ziehapparat in ziehstufen von pressen
DE3933806A1 (de) * 1989-10-10 1991-11-14 Schuler Gmbh L Ziehapparat in ziehstufen von pressen
DE4117102A1 (de) * 1991-05-25 1992-11-26 Schuler Gmbh L Presse mit zieheinrichtung
DE19726928A1 (de) * 1997-06-25 1999-01-07 Schuler Pressen Gmbh & Co Ziehapparat
US5971373A (en) * 1998-01-29 1999-10-26 Hsieh; Wen-Yuan Multi-cylinder buffer device
ES2527356T3 (es) * 2011-01-31 2015-01-22 Azol-Gas, S.L. Resorte de gas
EP2824359B1 (fr) * 2013-07-08 2015-07-01 Bordignon Silvano S.r.l. Compensateur de forces de compression non équilibrée pour presses
CN118045905B (zh) * 2024-03-11 2024-07-19 江苏蔚联精密科技有限公司 一种具有变形控制功能的散热片冲压装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1503105A (en) * 1922-02-06 1924-07-29 Marquette Tool & Mfg Co Pressure pad
US1846439A (en) * 1930-12-26 1932-02-23 Fredrich J Rode Metal working press
US2300162A (en) * 1938-05-13 1942-10-27 Dominion Eng Works Ltd Hydraulic press
US2989019A (en) * 1957-05-20 1961-06-20 Budd Co Method of deep drawing sheet material
GB1092869A (en) * 1965-09-21 1967-11-29 Dro Engineering Co Di Hydraulic system for dies
US3456478A (en) * 1967-07-07 1969-07-22 Bliss Co Hydraulic locking cylinders
DE2742405A1 (de) * 1977-09-21 1979-03-22 Krupp Gmbh Ziehapparat mit sperrvorrichtung
DE3202134C1 (de) * 1982-01-23 1983-07-07 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Druckluft-Zieheinrichtung mit einer im pressentisch gefuehrten Druckwange

Also Published As

Publication number Publication date
ES8704094A1 (es) 1987-03-16
US4712412A (en) 1987-12-15
DE3505984A1 (de) 1986-08-21
EP0192115A2 (fr) 1986-08-27
BR8600714A (pt) 1986-10-29
DE3664418D1 (en) 1989-08-24
EP0192115A3 (en) 1987-09-16
ES552164A0 (es) 1987-03-16

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