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EP0713735B1 - Dispositif de serrage entre l'outil supérieur et inférieur d'une presse - Google Patents

Dispositif de serrage entre l'outil supérieur et inférieur d'une presse Download PDF

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Publication number
EP0713735B1
EP0713735B1 EP95117213A EP95117213A EP0713735B1 EP 0713735 B1 EP0713735 B1 EP 0713735B1 EP 95117213 A EP95117213 A EP 95117213A EP 95117213 A EP95117213 A EP 95117213A EP 0713735 B1 EP0713735 B1 EP 0713735B1
Authority
EP
European Patent Office
Prior art keywords
stroke
short
pressure
clamping arrangement
cylinder
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
EP95117213A
Other languages
German (de)
English (en)
Other versions
EP0713735A1 (fr
Inventor
Wieland Dr. Petter
Gregor Geist
Andreas Schlag
Markus Dr. Müller
Wolf-Eckehart Gödel
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.)
Umformtechnik Erfurt GmbH
Original Assignee
Umformtechnik Erfurt 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 Umformtechnik Erfurt GmbH filed Critical Umformtechnik Erfurt GmbH
Publication of EP0713735A1 publication Critical patent/EP0713735A1/fr
Application granted granted Critical
Publication of EP0713735B1 publication Critical patent/EP0713735B1/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 Clamping device according to the preamble of claim 1.
  • a hydraulic cushion assembly for a press which is intended to apply a cushion force that is uniform for a workpiece across all pressure bolts.
  • a plurality of short-stroke cylinders that are fluidly connected to one another and whose short-stroke pistons are operatively connected to the pressure bolts are arranged on a pressure-pin plate that can be moved by the die cushion.
  • the short-stroke cylinders are connected to a hydraulic supply device to supply them with pressure medium.
  • the hydraulic supply device contains elements for changing an initial pressure in the short-stroke cylinders. This pressure change takes place before the start of the pressing operation.
  • the problem underlying the invention is a compensation device to create that with simple technical Averaging ensures that all thrust bolts have the same force transfer the force of the short-stroke cylinder with each other before full adhesion is reached almost excluded between the functional elements and the contact pattern of all pressure bolts achieved in this way is reproducible is.
  • the prerequisite for this is that all pressure bolts under Experience the same compression. This in turn does on the condition that geometric deviations of the in Functional elements lying in the power flow can be compensated.
  • Push pin points of the push pin plate with short stroke cylinders can be occupied, but expediently only those necessary according to an empirical determination Push pin points within the framework of the standardized grid Short stroke cylinders are occupied. While adjusting the Number and position of the pressure bolts for each tool manually takes place in the known form when changing tools the not necessary but on the push pin plate Existing short stroke cylinders are depressurized and so from communicating system can be disconnected. Likewise can determine the pressure pin points required for the specific tool to be covered with pressure bolts and the ones that still exist Short stroke piston of the unnecessary pressure pin points "blind" continue to operate. Alternatively, you can all existing short stroke cylinders are operated and only the pressure pin points required for the specific tool Pressure bolts are occupied.
  • the equipment can also do so be designed so that the individual when changing tools Short stroke cylinders in their assignment to the pressure bolts can be moved or removed and retrofitted. When change the number of pressure bolts and / or geometry deviations of the functional elements is a change in volume of the Compensation room expedient in the compensation cylinder.
  • the short stroke cylinders can also be used with different Active areas are formed.
  • the press ram 1 with the upper tool of a mechanical or hydraulic press comes into operative connection with the lower tool arranged on the sliding table 2 in a known manner according to FIG. 1.
  • the upper and lower tools are not shown. Due to geometrical deviations of the functional elements lying in the power flow during the drawing process, which in total are expressed in terms of the length difference 8, each of the pressure bolts 7 with y 1 to y n , there is no simultaneous contact of all relevant components.
  • the pressure pin plate 3 guided in the press table 4 is operatively connected in a known manner to a die cushion arranged on the cross member 19.
  • the die cushion piston 18 is acted upon by the die cushion force 23.
  • the short-stroke cylinders 5 are arranged on the pressure pin plate 3 and are flow-connected to one another via connecting lines 20.
  • a pressure pin 7 can be assigned to each short-stroke piston 6.
  • the flow-connected short-stroke cylinders 5 are connected via a connecting line 14 to a compensation chamber 22 of a compensation cylinder 10 which is preferably rigidly arranged on the pressure pin plate 3.
  • This connecting line 14 is simultaneously connected via a directional valve 17, to which a pressure relief valve 24 is connected in parallel, to a pressure medium container 16 integrated in the compensation cylinder 10.
  • the pressure medium container 16 is operatively connected to a pressure regulating device 15 via a directional valve 21.
  • An adjustable stroke limiter 13 is arranged on the piston rod rigidly connected to the compensation piston 11. Before the introduction of force from the press ram 1 via the upper tool into the pressure bolts 7, the short-stroke pistons 6 are in their upper, mechanically limited starting position, into which they are brought and held by spring force.
  • the spring can be mechanical or generated by pneumatic pressure.
  • the compensation piston 11 is in its mechanical, lower end position. With the first contact between the driving system of press ram 1 with the upper tool and the stationary drawing cushion with the pressure pin plate 3, the drawing cushion piston 18, the short-stroke cylinders 5 and the pressure pin 7, the relevant short-stroke piston 6 is displaced by the displacement stroke 9.
  • This displacement stroke 9 is in each case Short stroke cylinder 5 different and designated x 1 to x n .
  • all pressure bolts 7 follow until the start of drawing and displace pressure medium via the connecting lines 20 and 14 into the compensation chamber 22 of the compensation cylinder 10.
  • the pressure piston is displaced from the short-stroke cylinders 5 and the compensation piston 11 is displaced by the compensation stroke 12
  • This compensation stroke 12 and thus the sum of the pressure medium displaced from the short stroke cylinders 5 is determined by the adjustable stroke limiter 13.
  • Due to the mechanically limited volume absorption in the compensation cylinder 10, the displacement stroke 9 of the short-stroke piston 6 is interrupted in the drawing direction.
  • the pressure bolts are thus driven further against the acting die cushion force 23, which is supported on the press table 4 via the crossmember 19.
  • the qualitative position of the functional elements at the start of drawing is shown in FIG. 2.
  • the directional control valve 17 is located in the blocking position from the connecting line 14 in the direction of the pressure medium container 16.
  • the pressure relief valve 24 is arranged parallel to the directional control valve 17 to protect the hydraulic system against overload.
  • the directional valve 17 can also be designed as a continuous valve.
  • the pressure medium is returned from the compensation space 22 into the short-stroke cylinders 5, whereby the short-stroke pistons 6 reach their starting position.
  • the pressure medium is acted upon by pneumatic pressure via the pressure control device 15 and the directional control valve 21.
  • the pressure in the pressure medium container 16 causes a corresponding force through the differential area, which causes the pressure medium to flow back from the compensation chamber 22 guaranteed.
  • the pressure pin plate 3 a standardized number of pressure pin points 25.
  • the Need these individual pressure pin points 25 per tool is known to be very different.
  • the assembly of all or only for one Tool required pressure pin points 25 with short-stroke cylinders 5 is suggested, according to an empirical determined necessary pin assignment for Tools in a certain period of time short-stroke cylinder 5 too operate and only according to the respective tool required pressure pin points 25 with pressure pin 7 equip or those that are not required Push pin points 25 by "depressurizing" the not to put the required short stroke cylinder 5 out of operation.
  • the directional control valves 26 and 27 are between the short-stroke cylinders 5 and the pressure medium container 16 arranged and connected in series. They allow that for a Tool not required short stroke cylinder 5 relieved of pressure and thus be put out of operation. If necessary, the Number of short-stroke cylinders 5 adapted for each tool become. For this purpose, the short-stroke cylinders 5 are spatially Arrangement can be changed or removed and retrofitted. At Change in the number of pressure bolts 7 and / or Part geometry or the length difference 8 is one Volume change of the compensation space 22 by means of Stroke limitation 13 expedient.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Press Drives And Press Lines (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (7)

  1. Dispositif de serrage entre l'outil supérieur et l'outil inférieur d'une presse, destiné à obtenir la force de maintien de la tôle, comprenant une plaque à plots de pression (3) sur laquelle sont disposés un grand nombre de vérins à faible course (5), reliés les uns aux autres sur le plan fluidique, dont les pistons à faible course (6) sont reliés activement chacun à un plot de pression (7), ceux-ci étant susceptibles, par coopération entre l'outil supérieur et l'outil inférieur, de serrer la tôle devant subir le formage, caractérisé en ce que les chambres de pression des vérins à faible course (5), qui se trouvent sur le côté des pistons (6) des vérins à faible course, opposé à celui où se trouvent les plots de pression (7), sont reliées activement à un vérin de compensation (10) de façon telle, que le fluide de pression refoulé dans les vérins à faible course (5) le long de la course de refoulement (9), avant le début de l'emboutissage, par l'action de forces dans les plots de pression (7), est absorbé dans la chambre de compensation (22) du vérin de compensation (10), et en ce que la pression est identique dans toutes les chambres de pression.
  2. Dispositif de serrage selon la revendication 1, caractérisé en ce que pour chaque point de plot de pression (25) existant dans une plaque de serrage d'outil conformément aux différents outils, un vérin à faible course (5) peut respectivement être disposé sur la plaque à plots de pression (3).
  3. Dispositif de serrage selon la revendication 1, caractérisé en ce qu'il est possible de faire varier quant à leur disposition sur la plaque à plots de pression (3), les vérins à faible course (5), conformément aux exigences imposées par les outils.
  4. Dispositif de serrage selon l'une des revendications 1 à 3, caractérisé en ce que chaque vérin à faible course (5) peut être commuté séparément dans la position où il est hors de pression.
  5. Dispositif de serrage selon l'une des revendications 1 à 4, caractérisé en ce que le volume de la chambre de compensation (22) et ainsi la course de compensation (12) peuvent être modifiés par un limiteur de course (13) réglable.
  6. Dispositif de serrage selon l'une des revendications 1 à 5, caractérisé en ce que les vérins à faible course (5) et le vérin de compensation (10) sont disposés dans le même système mobile et n'effectuent pas de mouvements relatifs les uns par rapport aux autres.
  7. Dispositif de serrage selon l'une des revendications 1 à 6, caractérisé en ce que pour réaliser des transitions de pression souples au début de l'opération d'emboutissage, un distributeur (17) réalisé en tant que distributeur continu, est disposé entre la conduite de liaison conduisant aux chambres de pression et un réservoir de fluide de pression (16).
EP95117213A 1994-11-23 1995-11-02 Dispositif de serrage entre l'outil supérieur et inférieur d'une presse Expired - Lifetime EP0713735B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4441562A DE4441562A1 (de) 1994-11-23 1994-11-23 Längenkompensationseinrichtung in einer Klemmeinrichtung zwischen Ober- und Unterwerkzeug einer Presse
DE4441562 1994-11-23

Publications (2)

Publication Number Publication Date
EP0713735A1 EP0713735A1 (fr) 1996-05-29
EP0713735B1 true EP0713735B1 (fr) 1999-01-13

Family

ID=6533869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117213A Expired - Lifetime EP0713735B1 (fr) 1994-11-23 1995-11-02 Dispositif de serrage entre l'outil supérieur et inférieur d'une presse

Country Status (3)

Country Link
EP (1) EP0713735B1 (fr)
DE (2) DE4441562A1 (fr)
ES (1) ES2126199T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2991608B1 (fr) * 2012-06-07 2014-06-20 Peugeot Citroen Automobiles Sa Serre-flan pour presse d'emboutissage comportant un indicateur d'accostage de la chandelle du coussin de presse.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173755B1 (fr) * 1984-06-29 1989-02-01 L. SCHULER GmbH Dispositif d'étirage dans une presse
DE3735581C1 (de) * 1987-10-21 1988-05-11 Daimler Benz Ag Presse zum Ziehen von Blechteilen
DD298484A5 (de) * 1990-10-02 1992-02-27 Umformtechnik Erfurt Gmbh,De Hydraulischer blechhalter fuer einfachwirkende pressen
DE69201769T2 (de) * 1991-09-04 1995-08-24 Toyota Motor Co Ltd Hydraulische Polsteranordnung für eine Presse, mit einem Absperrventil zum Abschalten der Energieversorgung der Druckbolzen beim Kontakt des beweglichen Werkzeugs mit dem Werkstück.
EP0531140B1 (fr) 1991-09-04 1995-07-26 Toyota Jidosha Kabushiki Kaisha Système de coussin hydraulique pour une presse, ayant une alimentation hydraulique comprenant des moyens pour régler la pression initiale des cylindres des boulons de pression
JP2722937B2 (ja) * 1992-04-07 1998-03-09 トヨタ自動車株式会社 プレス機械のしわ押え荷重測定装置
EP0596696B1 (fr) * 1992-11-05 1997-09-03 Toyota Jidosha Kabushiki Kaisha Coussin d'étirage et procédé pour optimaliser la pression des goupilles des cylindres d'amortissement.

Also Published As

Publication number Publication date
DE4441562A1 (de) 1996-05-30
ES2126199T3 (es) 1999-03-16
EP0713735A1 (fr) 1996-05-29
DE59504805D1 (de) 1999-02-25

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