EP0713735A1 - Système de compensation de longueur dans un dispositif de serrage entre l'outil supérieur et inférieur d'une presse - Google Patents

Système de compensation de longueur dans un dispositif de serrage entre l'outil supérieur et inférieur d'une presse Download PDF

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Publication number
EP0713735A1
EP0713735A1 EP95117213A EP95117213A EP0713735A1 EP 0713735 A1 EP0713735 A1 EP 0713735A1 EP 95117213 A EP95117213 A EP 95117213A EP 95117213 A EP95117213 A EP 95117213A EP 0713735 A1 EP0713735 A1 EP 0713735A1
Authority
EP
European Patent Office
Prior art keywords
pressure
short
stroke
compensation
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.)
Granted
Application number
EP95117213A
Other languages
German (de)
English (en)
Other versions
EP0713735B1 (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
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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 length compensation device in a clamping device between the upper and lower tool of a press to achieve the sheet metal holding force, wherein the clamping device can be formed either by a die cushion or by a sheet metal holder.
  • 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 change in pressure takes place before the start of the pressing operation.
  • the problem of the invention is to provide a compensation device which ensures with simple technical means that all pressure pins transmit the same force, the force effect of the short-stroke cylinders among one another is almost excluded before the full force connection between the functional elements is achieved and the contact pattern of all pressure pins achieved in this way is reproducible is.
  • the prerequisite for this is that all pressure bolts experience the same compression under load. This in turn makes it a condition that geometric deviations of the functional elements lying in the power flow are compensated for.
  • the mechanically limited space in the compensation cylinder can advantageously be changed as a function of the number of pressure bolts used per tool and the sum of the geometric deviation of the functional elements located in the power flow.
  • Another advantage of the solution lies in the fact that although all of the pressure pin points of the pressure pin plate can be occupied by short-stroke cylinders, expediently, only the pressure-pin points necessary according to an empirical determination are occupied by short-stroke cylinders within the framework of the standardized grid. While the number and position of the pressure bolts for each tool are adjusted manually in the known form when the tool is changed, the short-stroke cylinders which are not necessary but are present on the pressure bolt plate can be depressurized and thus switched off communicating system can be disconnected.
  • the pressure pin points required for the specific tool can be occupied with pressure pins and the short-stroke pistons of the pressure pin points that are not required can still be operated "blindly".
  • all existing short-stroke cylinders can be operated and only the pressure pin points required for the specific tool can be assigned pressure bolts.
  • the equipment can also be designed so that the individual short-stroke cylinders can be shifted in their assignment to the pressure bolts or removed and retrofitted when the tool is changed. If the number of pressure bolts and / or geometric deviations of the functional elements changes, a volume change in the compensation space in the compensation cylinder is expedient.
  • the short-stroke cylinders can also be designed with different active surfaces.
  • 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 x1 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 control valve 17 can also be designed as a continuous valve.
  • the pressure medium is returned from the compensation chamber 22 into the short-stroke cylinders 5, as a result of which 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 has a standardized number of pressure pin points 25. As is known, the need for these individual pressure pin points 25 per tool is very different. In addition to the possibility of equipping all or the pressure pin points 25 required only for one tool with short-stroke cylinders 5, it is proposed to operate short-stroke cylinders 5 in a certain period of time after an empirically determined necessary pressure pin point assignment for tools and only the pressure pin points 25 required for the respective tool with pressure bolts 7 to equip or to deactivate the pressure pin points 25 that are not required by "depressurizing" the short-stroke cylinders 5 that are not required. The removal of the pressure bolts from the platen, not shown, is not a condition.
  • each short-stroke cylinder 5 is assigned a directional valve 26 and, in addition, all short-stroke cylinders 5 are jointly assigned the directional valve 27.
  • the directional control valves 26 and 27 are arranged between the short-stroke cylinders 5 and the pressure medium container 16 and connected in series. They enable the short-stroke cylinders 5 which are not required for a tool to be relieved of pressure and thus to be put out of operation. If necessary, the Number of short stroke cylinders 5 can be adjusted for each tool.
  • the short-stroke cylinders 5 can be changed in their spatial arrangement or can be retrofitted and retrofitted.
  • a volume change of the compensation space 22 by means of the stroke limiter 13 is expedient.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Presses And Accessory Devices Thereof (AREA)
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 true EP0713735A1 (fr) 1996-05-29
EP0713735B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2991608A1 (fr) * 2012-06-07 2013-12-13 Peugeot Citroen Automobiles Sa Serre-flan pour presse d'emboutissage comportant un indicateur d'accostage de la chandelle du coussin de presse.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173755A1 (fr) * 1984-06-29 1986-03-12 L. SCHULER GmbH Dispositif d'étirage dans une presse
FR2667257A1 (fr) * 1990-10-02 1992-04-03 Erfurt Umformtechnik Gmbh Serre-flan hydraulique pour presses a simple effet.
EP0531140A1 (fr) 1991-09-04 1993-03-10 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
EP0531141A1 (fr) * 1991-09-04 1993-03-10 Toyota Jidosha Kabushiki Kaisha Système de coussin hydraulique pour une presse, ayant une vanne d'arrêt pour déconnecter les boulons de pression d'alimentation hydraulique lors du contact de l'outil mobile avec la pièce
EP0565347A2 (fr) * 1992-04-07 1993-10-13 Toyota Jidosha Kabushiki Kaisha Méthode et appareil pour mesurer la force de serre-flan agissant sur un anneau de pression d'une presse
EP0596696A1 (fr) * 1992-11-05 1994-05-11 Toyota Jidosha Kabushiki Kaisha Procédé et dispositif pour contrôler, vérifier ou optimaliser la pression des goupilles des cylindres d'amortissement d'une presse par déchargement du fluide ou de la pression initiale

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3735581C1 (de) * 1987-10-21 1988-05-11 Daimler Benz Ag Presse zum Ziehen von Blechteilen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173755A1 (fr) * 1984-06-29 1986-03-12 L. SCHULER GmbH Dispositif d'étirage dans une presse
FR2667257A1 (fr) * 1990-10-02 1992-04-03 Erfurt Umformtechnik Gmbh Serre-flan hydraulique pour presses a simple effet.
EP0531140A1 (fr) 1991-09-04 1993-03-10 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
EP0531141A1 (fr) * 1991-09-04 1993-03-10 Toyota Jidosha Kabushiki Kaisha Système de coussin hydraulique pour une presse, ayant une vanne d'arrêt pour déconnecter les boulons de pression d'alimentation hydraulique lors du contact de l'outil mobile avec la pièce
EP0565347A2 (fr) * 1992-04-07 1993-10-13 Toyota Jidosha Kabushiki Kaisha Méthode et appareil pour mesurer la force de serre-flan agissant sur un anneau de pression d'une presse
EP0596696A1 (fr) * 1992-11-05 1994-05-11 Toyota Jidosha Kabushiki Kaisha Procédé et dispositif pour contrôler, vérifier ou optimaliser la pression des goupilles des cylindres d'amortissement d'une presse par déchargement du fluide ou de la pression initiale

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2991608A1 (fr) * 2012-06-07 2013-12-13 Peugeot Citroen Automobiles Sa Serre-flan pour presse d'emboutissage comportant un indicateur d'accostage de la chandelle du coussin de presse.

Also Published As

Publication number Publication date
DE4441562A1 (de) 1996-05-30
EP0713735B1 (fr) 1999-01-13
ES2126199T3 (es) 1999-03-16
DE59504805D1 (de) 1999-02-25

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