EP0062562A1 - Method and device for the automatic control of the press rams by means of cylinders with self blocking piston rods - Google Patents

Method and device for the automatic control of the press rams by means of cylinders with self blocking piston rods Download PDF

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Publication number
EP0062562A1
EP0062562A1 EP82400526A EP82400526A EP0062562A1 EP 0062562 A1 EP0062562 A1 EP 0062562A1 EP 82400526 A EP82400526 A EP 82400526A EP 82400526 A EP82400526 A EP 82400526A EP 0062562 A1 EP0062562 A1 EP 0062562A1
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EP
European Patent Office
Prior art keywords
blank holder
slide
pushers
rod
press
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
EP82400526A
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German (de)
French (fr)
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EP0062562B1 (en
Inventor
Gérard Duhamel
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Airbus Group SAS
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Airbus Group SAS
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Priority to AT82400526T priority Critical patent/ATE13983T1/en
Publication of EP0062562A1 publication Critical patent/EP0062562A1/en
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Publication of EP0062562B1 publication Critical patent/EP0062562B1/en
Expired legal-status Critical Current

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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
    • B21D24/10—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 present invention relates to an automatic adjustment device for the pushers of a stamping press. It also relates to a method of using this device.
  • Hydraulic stamping presses are used to stamp hollow parts from metal blanks.
  • a press consists of a frame, a table on which the die is fixed, a main slide which moves in translation relative to the table along slides. This slide carries a punch of shape complementary to that of the imprint of the matrix. Forming without removing metal is carried out in a tool that is not part of the machine. The closing, working, and opening movement of the tooling at the required forming pressure takes place via a hydraulic cylinder.
  • a blank holder arranged between the table and the main slide has the function of keeping the sheet blank tight against the die during the stamping operation.
  • This blank holder also moves in translation relative to the table, in order to allow the press to be fed with stamped parts and the evacuation of stamped parts.
  • the necessary clamping force exerted on the blank holder by a blank press slide located above the main slide is transmitted by pushers.
  • These pushers are in the form of elongated rods passing through the main slide and supported at their upper end under the hold-down slide and at their lower end on the hold-down itself.
  • Cross rods are placed in the pushers to avoid their fall during the ascent of the main slide during the adjustment phases.
  • the upward return of the hold-down clamps is ensured by the main slide by means of tie rods passing through the latter. These are screwed at their lower end to the blank holder and are supported by a shoulder from their upper end on the main slide.
  • the invention provides a solution. It relates to an automatic adjustment device for the pushers of a stamping press which eliminates their handling, assembly and adjustment.
  • the stamping press comprises in a known manner a table on which is clamped a die, a blank holder located above the table, a main slide which moves vertically in relation port to the table and on which a punch is clamped, a blank holder slide, pushers secured at one of their ends, the blank holder and at their other end, secured to the blank holder slide, these pushers being intended to transmit the clamping force of the blank holder slide to the blank holder.
  • each of the pushers consists of the rod of a jack mounted on the hold-down slide, this jack being provided with a length adjustment device by feeler, lockable and unblockable automatically, the rods their lower end comprising quick locking means on the blank holder.
  • the invention also relates to a method for automatically adjusting the pushers of a stamping press. Thanks to this process, it is no longer necessary to dismantle, reassemble and adjust the pushers at each tool change. It suffices to lock in the high position the push rods which are not used with a specific blank press. Thanks to a programmable automaton, the selection of the pushers to be used and the display of the stamping parameters can be easily automated.
  • FIG. 1 a stamping press according to the prior art of this type.
  • This press consists of a frame 2, a table 4, a main slide 6 and a hold-down slide 8.
  • the main slide is controlled by the main cylinder 10.
  • the hold-down slide 8 is controlled by at least two cylinders 12 with plunger.
  • the matrix 14 is clamped on the table 4.
  • a press of this type is called a "double-acting press" because it has two different slides actuated by two separate jack systems.
  • a triple-acting stamping press has the same elements that perform the same functions. There is only added an upward movement located under the table 4.
  • the punch 16 is fixed to the main slide 6, also called stamping slide.
  • the sheet blank to be stamped 18 is placed on the die 14.
  • the blank holder 20 has the function of clamping the sheet blank 18 during the stamping operation. It is controlled by means of pushers 22 interposed between itself and the blank holder slide.
  • the two jacks 12 bring the slide 8 into abutment against the main slide 6.
  • the force transmitted by the pushers 22 to the blank holder 20 therefore depends on the setting of the length of these pushers. This adjustment is made using shims and requires great precision.
  • tie rods 22a are slidably mounted in bores made in the main slide 6 and are screwed at their lower end into the blank holder 20 while their upper end carries a shoulder which prevents them from crossing the main slider 6: These tie rods ensure the raising of the blank holder by raising the slider 6.
  • buttons are carried out as follows. First of all, the stamping slide 6 is lowered onto the table 4 (see FIG. 1, half-view on the right); the pushers 22 are introduced inside the orifices 7 provided for this purpose in the slide. The rods retaining rods 22 are introduced at their upper part.
  • This tooling is composed as it was said before cedent, a die 14, a punch 16 and a blank holder 20. We descend the main slide 6 in contact with the tool.
  • This main slide is then in the position it will occupy during normal press operation at the end of the stamping operation, to the thickness of the blank.
  • the punch is flanged on the underside of the main slide and the die on the table 4. It remains to perform a wedging between the upper end of the pushers 22 and the underside of the hold-down slide 8 to make up for the play of wear.
  • the stamping slide 6 and the blank holder slide 8 are then reassembled via the tie rods 22a. The press is then ready to work.
  • FIG. 2 shows a stamping press according to the invention, which makes it possible to considerably reduce the duration of the operations for adjusting the pushers.
  • the general construction of this press is similar to that of FIG. 1. It comprises a frame 2, a table 4, a stamping slide 6 and a blank clamp slide 8.
  • the tool that is to say the die 14, the punch 16, and the blank holder 20 is identical.
  • the pushers which transmit the clamping force of the blank holder slide 8 to the blank holder 20, designated by the reference 22 in FIG. 1, here consist of the rods 24 of the jacks 26 mounted vertically on the blank holder slide 8.
  • the rods 24 of these jacks there is an automatic locking and unlocking device 28.
  • the rod 24 has a quick locking system on the blank holder. This system can be automatic.
  • the means for locking and unlocking the rod 24 of the jack 26 are shown on an enlarged scale in FIG. 3. They are preferably constituted by a sleeve 30 which surrounds the rod 24; by means of the sleeve 30, it is possible to tighten and loosen the rod 24 in such a way that the friction forces lock it in its position.
  • the blocking of the rod 24 is effected when a hydraulic pressure is exerted outside the sleeve 30.
  • the unblocking is then effected by lack of pressure.
  • a reverse locking system is used in which the sleeve 30 has an internal bore whose diameter is less than that of the rod 24. This gives a friction connection due to the elastic deformation of the materials present.
  • the release is obtained by a hydraulic pressure applied uniformly inside the sleeve 30 between the two contact surfaces.
  • the "auto-lock" system manufactured and marketed by the Quiri Company is an automatic blocking system which can be used with satisfaction in a press of the invention.
  • the punch 16 is flanged on the underside of this slide.
  • this clamping can be carried out by means of a hydraulic fast clamping device.
  • the travel of the blank holder slide 8 is defined by stopping the main slide at top dead center in a position chosen according to the tooling. This position depends in particular on the thickness of the blank to be stamped.
  • the blank holder slide 8 Descend the blank holder slide 8 in abutment on the main slide.
  • the blank holder slide 8 has, at its lower part, stops 32 intended to provide a clearance between the lower part of the locking and unlocking device 28 and the upper face of the stamping slide 6.
  • the slide 8 being in abutment, the cylinder rods 24 are released and they are brought down into abutment on the blank holder 20.
  • This blank holder comprises a locking and quick unlocking device 33 from the end 24A. According to a variant, this locking 33 can be carried out automatically.
  • the hydraulic pressure inside the jack 26 increases rapidly, since the volume available for the fluid no longer increases. The detection of this increase in pressure makes it possible to develop a signal which on the one hand interrupts the low pressure hydraulic supply to the jack 26 and on the other hand blocks the rod 24 by means of the device 28.
  • the blocking of the rod 24 is obtained by means of a cancellation of the hydraulic pressure exerted inside the sleeve 30.
  • the pressure in the socket and in the cylinder is simultaneously controlled by a pressure switch, when the supply pressure of the cylinder reaches a predetermined threshold lower than the regulating pressure of the entire press.
  • the stamping slide 6 and the blank holder slide 8 are then raised to the high position.
  • the press is then ready to work.
  • the definition of the stroke of the pushers by probing allows automatic adjustment of the wear clearances at each adjustment.
  • FIG. 3 shows two different tools: on the one hand a matrix 14 and a blank holder 20, and on the other hand a matrix 14 'and a blank holder 20'.
  • a number of pushers for example the pushbutton 24 'are not used. It then suffices to raise it up, as shown in FIG. 3, and to block it in this position by means of the automatic locking and unlocking device 28. In the example shown, this blocking is effected by lack of pressure. Thanks to a programmable automaton, the selection of the pushers to be used and the display of the stamping parameters are automatic.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Control Of Presses (AREA)
  • Forging (AREA)

Abstract

Process and device for the automatic regulation of the push rods of a press by means of a self-locking rod jack. The device comprises a table, a matrix, a blank holder, a main slide, a punch and a blank holder slide. Each of the push rods comprises a jack rod mounted on the blank holder slide. The jack is equipped with an automatically lockable and unlockable device for regulating the length by sensing. At their lower end, in each case the rods have means for the high-speed locking to the blank holder.

Description

La présente invention a pour objet un dispositif de réglage automatique des poussoirs d'une presse à emboutir. Elle a également pour objet un procédé d'utilisation de ce dispositif.The present invention relates to an automatic adjustment device for the pushers of a stamping press. It also relates to a method of using this device.

Les presses d'emboutissage hydraulique permettent d'emboutir des pièces creuses à partir de flans en métal. Une presse se compose d'un bâti, d'une table sur laquelle est fixée la matrice, d'un coulisseau principal qui se déplace en translation par rapport à la table le long de glissières. Ce coulisseau porte un poinçon de forme complémentaire à celle de l'empreinte de la matrice. Le formage sans enlèvement de métal est réalisé dans un outillage qui ne fait pas partie de la machine. Le mouvement de fermeture, de travail, et d'ouverture de l'outillage à la pression de formage demandée s'effectue par l'intermédiaire d'un cylindre hydraulique.Hydraulic stamping presses are used to stamp hollow parts from metal blanks. A press consists of a frame, a table on which the die is fixed, a main slide which moves in translation relative to the table along slides. This slide carries a punch of shape complementary to that of the imprint of the matrix. Forming without removing metal is carried out in a tool that is not part of the machine. The closing, working, and opening movement of the tooling at the required forming pressure takes place via a hydraulic cylinder.

Un serre-flan disposé entre la table et le coulisseau principal a pour fonction de maintenir le flan de tôle serré contre la matrice pendant l'opération d'emboutissage. Ce serre-flan se déplace lui aussi en translation par rapport à la table, afin de permettre l'alimentation de la presse en pièces à emboutir et l'évacuation des pièces embouties.A blank holder arranged between the table and the main slide has the function of keeping the sheet blank tight against the die during the stamping operation. This blank holder also moves in translation relative to the table, in order to allow the press to be fed with stamped parts and the evacuation of stamped parts.

L'effort de serrage nécessaire exercé sur le serre-flan par un coulisseau de presse-flan situé au-dessus du coulisseau principal est transmis par des poussoirs. Ces poussoirs se présentent sous la forme de tiges allongées traversant le coulisseau principal et appuyées à leur extrémité supérieure sous le coulisseau de serre-flan et à leur extrémité inférieure sur le serre-flan lui-même. Des baguettes transversales sont disposées dans les poussoirs pour éviter leur chute pendant la remontée du coulisseau principal lors des phases de réglage. Le rappel vers le haut des serre-flan est assuré par le coulisseau principal au moyen de tirants traversant ce dernier. Ceux-ci sont vissés à leur extrémité inférieure sur le serre-flan et sont appuyés par un épaulement de leur extrémité supérieure sur le coulisseau principal.The necessary clamping force exerted on the blank holder by a blank press slide located above the main slide is transmitted by pushers. These pushers are in the form of elongated rods passing through the main slide and supported at their upper end under the hold-down slide and at their lower end on the hold-down itself. Cross rods are placed in the pushers to avoid their fall during the ascent of the main slide during the adjustment phases. The upward return of the hold-down clamps is ensured by the main slide by means of tie rods passing through the latter. These are screwed at their lower end to the blank holder and are supported by a shoulder from their upper end on the main slide.

Avec une presse de ce type, il est nécessaire de procéder à un réglage des poussoirs préalablement à toute opération d'emboutissage d'une nouvelle série de pièces.With a press of this type, it is necessary to adjust the pushers before any drawing operation of a new series of parts.

Or, la durée des opérations de réglage est importante, de l'ordre de deux heures, ce qui conduit à l'immobilisation de machines très coûteuses, et à une augmentation des coûts de production. De plus, il s'agit d'opérations fastidieuses pour l'opérateur en raison du nombre et du poids des poussoirs à manipuler.However, the duration of the adjustment operations is significant, of the order of two hours, which leads to the immobilization of very expensive machines, and to an increase in production costs. In addition, these are tedious operations for the operator because of the number and weight of the pushers to handle.

On comprend donc l'intérêt de réduire la durée de l'opération de réglage des poussoirs. C'est précisément à ce problème que l'invention apporte une solution. Elle a pour objet un dispositif de réglage automatique des poussoirs d'une presse à emboutir qui permet de supprimer leur manutention, leur montage et leur réglage.We therefore understand the advantage of reducing the duration of the push button adjustment operation. It is precisely to this problem that the invention provides a solution. It relates to an automatic adjustment device for the pushers of a stamping press which eliminates their handling, assembly and adjustment.

A cet effet, les poussoirs de l'art antérieur sont remplacés par des vérins équipés d'un système de blocage et de déblocage automatique de la tige.To this end, the pushers of the prior art are replaced by jacks equipped with an automatic locking and unlocking system of the rod.

Plus précisément, la presse à emboutir selon la présente invention comporte de façon connue une table sur laquelle est bridée une matrice, un serre-flan situé au-dessus de la table, un coulisseau principal qui se déplace verticalement par rapport à la table et sur lequel est bridé un poinçon, un coulisseau de serre-flan, des poussoirs solidaires à l'une de leurs extrémités, du serre-flan et à leur autre extrémité, solidaires du coulisseau de serre-flan, ces poussoirs étant destinés à transmettre l'effort de serrage du coulisseau de serre-flan au serre-flan. Elle se caractérise en ce que chacun des poussoirs est constitué par la tige d'un vérin monté sur le coulisseau de serre-flan, ce vérin étant muni d'un dispositif de réglage de longueur par palpage, blocable et déblocable automatiquement, les tiges à leur extrémité inférieure comportant des moyens de verrouillage rapide sur le serre-flan.More specifically, the stamping press according to the present invention comprises in a known manner a table on which is clamped a die, a blank holder located above the table, a main slide which moves vertically in relation port to the table and on which a punch is clamped, a blank holder slide, pushers secured at one of their ends, the blank holder and at their other end, secured to the blank holder slide, these pushers being intended to transmit the clamping force of the blank holder slide to the blank holder. It is characterized in that each of the pushers consists of the rod of a jack mounted on the hold-down slide, this jack being provided with a length adjustment device by feeler, lockable and unblockable automatically, the rods their lower end comprising quick locking means on the blank holder.

L'invention concerne également un procédé de réglage automatique des poussoirs d'une presse à emboutir. Grâce à ce procédé, il n'est plus nécessaire de démonter, remonter et régler les poussoirs à chaque changement d'outillage. Il suffit de bloquer en position haute les tiges poussoirs qui ne servent pas avec un presse-flan déterminé. Grâce à un automate programmable, la sélection des poussoirs à utiliser et l'affichage des paramètres d'emboutissage peuvent être aisément automatisés.The invention also relates to a method for automatically adjusting the pushers of a stamping press. Thanks to this process, it is no longer necessary to dismantle, reassemble and adjust the pushers at each tool change. It suffices to lock in the high position the push rods which are not used with a specific blank press. Thanks to a programmable automaton, the selection of the pushers to be used and the display of the stamping parameters can be easily automated.

Plus précisément, ce procédé se caractérise en ce que, les outillages ayant été montés sur la table :

  • - on descend le coulisseau de serre-flan en butée sur le coulisseau emboutisseur,
  • - on débloque les tiges des vérins et on les descend jusqu'à ce qu'elles soient en butée contre le serre-flan,
  • - on commande automatiquement le blocage des tiges à partir d'un signal détectant l'augmentation de pression hydraulique dans les vérins,
  • - on bloque les extrémités des tiges sur le serre-flan.
More precisely, this process is characterized in that, the tools having been mounted on the table:
  • - the blank holder slide is lowered into abutment on the stamping slide,
  • - the rods of the cylinders are released and lowered until they are in abutment against the blank holder,
  • - the rods are locked automatically from a signal detecting the increase in hydraulic pressure in the cylinders,
  • - the ends of the rods are blocked on the blank holder.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui suit, donnée à titre illustratif et nullement limitatif, en regard des dessins annexés, sur lesquels :

  • - la figure 1 représente une presse hydraulique à emboutir de l'art antérieur,
  • - la figure 2 représente une presse à emboutir conforme à l'invention,
  • - la figure 3 montre le détail de la presse représentée sur la figure 2.
Other characteristics and advantages of the invention will emerge from the description which follows, given by way of illustration and in no way limiting, with reference to the appended drawings, in which:
  • FIG. 1 represents a hydraulic stamping press of the prior art,
  • FIG. 2 represents a stamping press according to the invention,
  • - Figure 3 shows the detail of the press shown in Figure 2.

On a représenté sur la figure 1 une presse à emboutir selon l'art antérieur de ce type. Cette presse se compose d'un bâti 2, d'une table 4, d'un coulisseau principal 6 et d'un coulisseau de serre-flan 8. Le coulisseau principal est commandé par le cylindre principal 10. Le coulisseau serre-flan 8 est commandé par au moins deux cylindres 12 avec piston plongeur. La matrice 14 est bridée sur la table 4.There is shown in Figure 1 a stamping press according to the prior art of this type. This press consists of a frame 2, a table 4, a main slide 6 and a hold-down slide 8. The main slide is controlled by the main cylinder 10. The hold-down slide 8 is controlled by at least two cylinders 12 with plunger. The matrix 14 is clamped on the table 4.

Sur la demi-vue de gauche de la figure 1, le coulisseau principal 6 et le coulisseau de serre-flan 8 sont représentés en position haute. Sur la demi-vue de droite, le coulisseau principal et le coulisseau serre-flan ont été descendus jusqu'au contact avec l'outillage.In the left half-view of FIG. 1, the main slide 6 and the blank holder slide 8 are shown in the high position. On the right half-view, the main slide and the hold-down slide were lowered until contact with the tools.

Une presse de ce type est appelée "presse à double effet" parce qu'elle comporte deux coulisseaux différents actionnés par deux systèmes de vérins séparés. Une presse d'emboutissage à triple effet comporte les mêmes éléments qui accomplissent les mêmes fonctions. Il s'y ajoute seulement un mouvement de montée situé sous la table 4. Le poinçon 16 est fixé au coulisseau principal 6, appelé encore coulisseau emboutisseur. Le flan de tôle à emboutir 18 est disposé sur la matrice 14. Le serre-flan 20 a pour fonction de serrer le flan de tôle 18 pendant l'opération d'emboutissage. Il est commandé par l'intermédiaire de poussoirs 22 interposés entre lui-même et le coulisseau de serre-flan. Les deux vérins 12 amènent le coulisseau 8 en butée contre le coulisseau principal 6. L'effort transmis par les poussoirs 22 au presse-flan 20 dépend donc du réglage de là longueur de ces poussoirs. Ce réglage est réalisé au moyen de cales d'épaisseur et nécessite une grande précision.A press of this type is called a "double-acting press" because it has two different slides actuated by two separate jack systems. A triple-acting stamping press has the same elements that perform the same functions. There is only added an upward movement located under the table 4. The punch 16 is fixed to the main slide 6, also called stamping slide. The sheet blank to be stamped 18 is placed on the die 14. The blank holder 20 has the function of clamping the sheet blank 18 during the stamping operation. It is controlled by means of pushers 22 interposed between itself and the blank holder slide. The two jacks 12 bring the slide 8 into abutment against the main slide 6. The force transmitted by the pushers 22 to the blank holder 20 therefore depends on the setting of the length of these pushers. This adjustment is made using shims and requires great precision.

Par ailleurs, des poussoirs particuliers, qu'on appellera tirants 22a, dans la suite du texte, sont montés coulissants dans des alésages pratiqués dans le coulisseau principal 6 et sont vissés à leur extrémité inférieure dans le serre-flan 20 tandis que leur extrémité supérieure porte un épaulement qui les empêche de·traverser le coulisseau principal 6: Ces tirants assurent le relevage du serre-flan par la remontée du coulisseau 6.Furthermore, particular pushers, which will be called tie rods 22a, in the following text, are slidably mounted in bores made in the main slide 6 and are screwed at their lower end into the blank holder 20 while their upper end carries a shoulder which prevents them from crossing the main slider 6: These tie rods ensure the raising of the blank holder by raising the slider 6.

Lorsque l'on change l'outillage de la presse, c'est-à-dire la matrice 14 et le poinçon 16 pour emboutir une série de pièces différentes, il est nécessaire de régler à nouveau la longueur des poussoirs 22. Le changement de poussoirs s'effectue de la manière suivante. Tout d'abord, on fait descendre le coulisseau emboutisseur 6 sur la table 4 (voir figure 1, demi-vue de droite) ; on introduit les poussoirs 22 à l'intérieur des orifices 7 prévus à cet effet dans le coulisseau. On introduit les baguettes de retenue des poussoirs 22 à leur partie supérieure. On remonte le coulisseau principal 6 et on introduit l'outillage de la presse sur la table 4. Cet outillage se compose comme il a été dit précédemment, d'une matrice 14, d'un poinçon 16 et d'un serre-flan 20. On descend le coulisseau principal 6 en contact avec l'outillage. Ce coulisseau principal se trouve alors dans la position qu'il occupera pendant le fonctionnement normal de la presse à la fin de l'opération d'emboutissage, à l'épaisseur du flan près. On bride le poinçon sur la face inférieure du coulisseau principal et la matrice sur la table 4. Il reste à effectuer un calage entre l'extrémité supérieure des poussoirs 22 et la face inférieure du coulisseau de serre-flan 8 pour rattraper les jeux d'usure. On remonte alors le coulisseau emboutisseur 6 et le coulisseau de serre-flan 8 par l'intermédiaire des tirants 22a. La presse est alors prête à travailler.When changing the tooling of the press, that is to say the die 14 and the punch 16 to stamp a series of different parts, it is necessary to adjust again the length of the pushers 22. The change of buttons are carried out as follows. First of all, the stamping slide 6 is lowered onto the table 4 (see FIG. 1, half-view on the right); the pushers 22 are introduced inside the orifices 7 provided for this purpose in the slide. The rods retaining rods 22 are introduced at their upper part. We go up the main slide 6 and we introduce the tooling of the press on the table 4. This tooling is composed as it was said before cedent, a die 14, a punch 16 and a blank holder 20. We descend the main slide 6 in contact with the tool. This main slide is then in the position it will occupy during normal press operation at the end of the stamping operation, to the thickness of the blank. The punch is flanged on the underside of the main slide and the die on the table 4. It remains to perform a wedging between the upper end of the pushers 22 and the underside of the hold-down slide 8 to make up for the play of wear. The stamping slide 6 and the blank holder slide 8 are then reassembled via the tie rods 22a. The press is then ready to work.

L'ensemble des opérations de montage et de réglage des poussoirs qui viennent d'être décrites sont très longues, de l'ordre de deux heures.The assembly and adjustment operations of the pushers which have just been described are very long, of the order of two hours.

On a représenté sur la figure 2, une presse à emboutir selon l'invention, qui permet de réduire considérablement la durée des opérations de réglage des poussoirs. La constitution générale de cette presse est semblable à celle de la figure 1. Elle comporte un bâti 2, une table 4, un coulisseau emboutisseur 6 et un coulisseau de serre-flan 8. L'outillage, c'est-à-dire la matrice 14, le poinçon 16, et le serre-flan 20 est identique.FIG. 2 shows a stamping press according to the invention, which makes it possible to considerably reduce the duration of the operations for adjusting the pushers. The general construction of this press is similar to that of FIG. 1. It comprises a frame 2, a table 4, a stamping slide 6 and a blank clamp slide 8. The tool, that is to say the die 14, the punch 16, and the blank holder 20 is identical.

Conformément à l'invention, les poussoirs qui transmettent l'effort de serrage du coulisseau de serre-flan 8 au serre-flan 20, désignés par la référence 22 sur la figure 1, sont ici constitués par les tiges 24 des vérins 26 montés verticalement sur le coulisseau de serre-flan 8. Autour de chacune des tiges 24 de ces vérins, on trouve un dispositif automatique de blocage et de déblocage 28. A son extrémité inférieure 24a, la tige 24 comporte un système de verrouillage rapide, sur le serre-flan. Ce système peut être automatique.In accordance with the invention, the pushers which transmit the clamping force of the blank holder slide 8 to the blank holder 20, designated by the reference 22 in FIG. 1, here consist of the rods 24 of the jacks 26 mounted vertically on the blank holder slide 8. Around each of the rods 24 of these jacks, there is an automatic locking and unlocking device 28. At its lower end 24a, the rod 24 has a quick locking system on the blank holder. This system can be automatic.

Les moyens pour bloquer et débloquer la tige 24 du vérin 26 sont représentés à échelle agrandie sur la figure 3. Ils sont de préférence constitués par une douille 30 qui entoure la tige 24 ; au moyen de la douille 30, on peut serrer et desserrer la tige 24 de telle manière que les forces de frottement la bloquent dans sa position. Le blocage de la tige 24 s'effectue lorsque l'on exerce une pression hydraulique à l'extérieur de la douille 30. Le déblocage s'effectue alors par manque de pression. De préférence, on utilise un système de blocage inverse dans lequel la douille 30 présente un alésage intérieur dont le diamètre est inférieur à celui de la tige 24. On obtient ainsi une liaison par frottement due à la déformation élastique des matériaux en présence. Le déblocage est obtenu par une pression hydraulique appliquée uniformément à l'intérieur de la douille 30 entre les deux surfaces de contact. Le système "auto-lock", fabriqué et commercialisé par la Société Quiri est un système de blocage automatique qui peut être utilisé avec satisfaction dans une presse de l'invention.The means for locking and unlocking the rod 24 of the jack 26 are shown on an enlarged scale in FIG. 3. They are preferably constituted by a sleeve 30 which surrounds the rod 24; by means of the sleeve 30, it is possible to tighten and loosen the rod 24 in such a way that the friction forces lock it in its position. The blocking of the rod 24 is effected when a hydraulic pressure is exerted outside the sleeve 30. The unblocking is then effected by lack of pressure. Preferably, a reverse locking system is used in which the sleeve 30 has an internal bore whose diameter is less than that of the rod 24. This gives a friction connection due to the elastic deformation of the materials present. The release is obtained by a hydraulic pressure applied uniformly inside the sleeve 30 between the two contact surfaces. The "auto-lock" system, manufactured and marketed by the Quiri Company is an automatic blocking system which can be used with satisfaction in a press of the invention.

Le changement d'outillage et le réglage des poussoirs au moyen du dispositif de l'invention s'effectue de la manière suivante :

  • En partant de la presse en position de repos, c'est-à-dire le coulisseau emboutisseur 6 et le coulisseau de serre-flan 8 étant en position remontée, on monte et on centre l'outillage sur la table 4. Afin de raccourcir la durée de cette opération, on utilise un dispositif hydraulique de bridage rapide.
The tooling change and the adjustment of the pushers by means of the device of the invention is carried out as follows:
  • Starting from the press in the rest position, that is to say the stamping slide 6 and the blank holder slide 8 in the raised position, the tool is mounted and centered on the table 4. In order to shorten for the duration of this operation, a hydraulic fast clamping device is used.

On descend le coulisseau emboutisseur. On bride le poinçon 16 sur la face inférieure de ce coulisseau. Comme pour la matrice, ce bridage peut être effectué au moyen d'un dispositif hydraulique de bridage rapide. On définit la course du coulisseau de serre-flan 8 en arrêtant le coulisseau principal au point mort haut dans une position choisie en fonction de l'outillage. Cette position dépend en particulier de l'épaisseur du flan à emboutir.We descend the stamping slide. The punch 16 is flanged on the underside of this slide. As with the die, this clamping can be carried out by means of a hydraulic fast clamping device. The travel of the blank holder slide 8 is defined by stopping the main slide at top dead center in a position chosen according to the tooling. This position depends in particular on the thickness of the blank to be stamped.

On descend le coulisseau de serre-flan 8 en butée sur le coulisseau principal. En effet, comme on peut le voir sur les figures 2 et 3, le coulisseau de serre-flan 8 comporte, à sa partie inférieure, des butées 32 destinées à ménager un jeu entre la partie inférieure du dispositif de blocage et de déblocage 28 et la face supérieure du coulisseau emboutisseur 6. Le coulisseau 8 étant en butée, on débloque les tiges de vérins 24 et on les fait descendre en butée sur le serre-flan 20. Ce serre-flan comporte un dispositif de verrouillage et de déverrouillage rapide 33 de l'extrémité 24A. Selon une variante, ce verrouillage 33 peut être effectué automatiquement. Une fois l'extrémité 24a en butée contre le serre-flan 20, la pression hydraulique à l'intérieur du vérin 26 augmente rapidement, puisque le volume disponible pour le fluide n'augmente plus. La détection de cette augmentation de pression permet d'élaborer un signal qui interrompt d'une part l'alimentation hydraulique à basse pression du vérin 26 et d'autre part, bloque la tige 24 au moyen du dispositif 28.Descend the blank holder slide 8 in abutment on the main slide. In fact, as can be seen in FIGS. 2 and 3, the blank holder slide 8 has, at its lower part, stops 32 intended to provide a clearance between the lower part of the locking and unlocking device 28 and the upper face of the stamping slide 6. The slide 8 being in abutment, the cylinder rods 24 are released and they are brought down into abutment on the blank holder 20. This blank holder comprises a locking and quick unlocking device 33 from the end 24A. According to a variant, this locking 33 can be carried out automatically. Once the end 24a abuts against the blank holder 20, the hydraulic pressure inside the jack 26 increases rapidly, since the volume available for the fluid no longer increases. The detection of this increase in pressure makes it possible to develop a signal which on the one hand interrupts the low pressure hydraulic supply to the jack 26 and on the other hand blocks the rod 24 by means of the device 28.

Dans un mode de réalisation préférentiel de l'invention, le blocage de la tige 24 est obtenu au moyen d'une annulation de la pression hydraulique exercée à l'intérieur de la douille 30. Cette annulation de pression simultanément dans la douille et dans le vérin est commandée par un pressostat, lorsque la pression d'alimentation du vérin atteint un seuil prédéterminée inférieur à la pression de régulation de l'ensemble de la presse.In a preferred embodiment of the invention, the blocking of the rod 24 is obtained by means of a cancellation of the hydraulic pressure exerted inside the sleeve 30. This annu The pressure in the socket and in the cylinder is simultaneously controlled by a pressure switch, when the supply pressure of the cylinder reaches a predetermined threshold lower than the regulating pressure of the entire press.

Ainsi, en cas de panne d'alimentation hydraulique du dispositif, la retenue de la tige 24 étant assurée par le frottement dans la douille 30, tout danger de manoeuvre intempestive est évité.Thus, in the event of a hydraulic supply failure of the device, the retention of the rod 24 being ensured by the friction in the sleeve 30, any danger of untimely operation is avoided.

On remonte alors le coulisseau emboutisseur 6 et le coulisseau de serre-flan 8 en position haute. La presse est alors prête à travailler.The stamping slide 6 and the blank holder slide 8 are then raised to the high position. The press is then ready to work.

Le réglage des poussoirs de la presse tel qu'il vient d'être décrit permet de réduire le temps de réglage des outillages à 5 minutes environ. Il permet donc le changement plus fréquent des outillages et conduit par conséquent à la suppression des temps d'immobilisation de la presse, lors des attentes en interfaces d'emboutissage consacrées aux traitements thermiques.The adjustment of the press pushers as just described makes it possible to reduce the tool setting time to around 5 minutes. It therefore allows more frequent tooling changes and consequently leads to the elimination of the downtime of the press, when waiting for stamping interfaces dedicated to heat treatments.

Par ailleurs, la définition de la course des poussoirs par palpage permet un rattrapage automatique des jeux d'usure à chaque réglage.Furthermore, the definition of the stroke of the pushers by probing allows automatic adjustment of the wear clearances at each adjustment.

De plus, toutes les manipulations des poussoirs et leur stockage sont supprimés. En effet, lorsque l'on change l'outillage de la presse, il n'est pas nécessaire de démonter les poussoirs qui ne servent pas. On a représenté sur la figure 3 deux outillages différents : d'une part une matrice 14 et un serre-flan 20, et d'autre part une matrice 14' et un serre-flan 20'. Lorsque l'on utilise la matrice 14 et le serre-flan 20 un certain nombre de poussoirs, par exemple le poussoir 24' ne servent pas. Il suffit alors de le remonter en position haute, comme représenté sur la figure 3, et de le bloquer dans cette position au moyen du dispositif 28 de blocage et de déblocage automatique. Dans l'exemple représenté, ce blocage s'effectue par manque de pression. Grâce à un automate programmable, la sélection des poussoirs à utiliser et l'affichage des paramètres d'emboutissage sont automatiques.In addition, all manipulations of the pushers and their storage are eliminated. Indeed, when changing the tooling of the press, it is not necessary to disassemble the pushers which are not used. FIG. 3 shows two different tools: on the one hand a matrix 14 and a blank holder 20, and on the other hand a matrix 14 'and a blank holder 20'. When using the die 14 and the blank holder 20 a number of pushers, for example the pushbutton 24 'are not used. It then suffices to raise it up, as shown in FIG. 3, and to block it in this position by means of the automatic locking and unlocking device 28. In the example shown, this blocking is effected by lack of pressure. Thanks to a programmable automaton, the selection of the pushers to be used and the display of the stamping parameters are automatic.

Claims (5)

1. Presse d'emboutissage qui comporte de façon connue une table (4) sur laquelle est bridée une matrice (14), un serre-flan (20) situé au-dessus de la table (4), un coulisseau principal (6) qui se déplace verticalement par rapport à la table (4) et sur lequel est bridé un poinçon (16), un coulisseau de serre-flan (8), des poussoirs solidaires, à l'une de leurs extrémités, du serre-flan (20) et à leur autre extrémité, solidaires du coulisseau de serre-flan (8), ces poussoirs étant destinés transmettre l'effort de serrage du coulisseau (8) au serre-flan (20), caractérisée en ce que chacun des poussoirs est constitué par la tige (24) d'un vérin (26) monté sur le coulisseau de serre-flan (8), ce vérin (26) étant muni d'un dispositif (28) de réglage de longueur par palpage, blocable.et déblocable automatiquement, les tiges (24), à leur extrémité inférieure (24a), comportant des moyens de verrouillage rapide sur le serre-flan (20).1. Stamping press which comprises in a known manner a table (4) on which is clamped a die (14), a blank holder (20) located above the table (4), a main slide (6) which moves vertically with respect to the table (4) and on which is clamped a punch (16), a blank holder slide (8), pushers integral, at one of their ends, with the blank holder ( 20) and at their other end, integral with the blank holder slide (8), these pushers being intended to transmit the clamping force of the slide (8) to the blank holder (20), characterized in that each of the pushers is constituted by the rod (24) of a jack (26) mounted on the blank holder slide (8), this jack (26) being provided with a device (28) for adjusting the length by feeler, lockable. and automatically unlockable, the rods (24), at their lower end (24a), comprising quick locking means on the blank holder (20). 2. Dispositif selon la revendication 1, caractérisé en ce que les moyens pour bloquer et débloquer la tige (24) du vérin (26) sont constitués par une douille (30) montée autour de cette tige et solidaire du cylindre du vérin (26), le blocage et le déblocage de la tige (24) s'effectuant par serrage commandé au moyen d'une pression hydraulique.2. Device according to claim 1, characterized in that the means for locking and unlocking the rod (24) of the jack (26) consist of a bush (30) mounted around this rod and integral with the cylinder of the jack (26) , the locking and unlocking of the rod (24) being effected by controlled tightening by means of hydraulic pressure. 3. Dispositif selon la revendication 2, caractérisé en ce que le blocage de la tige (24) s'effectue au moyen d'une pression hydraulique exercée sur l'extérieur de la douille (30).3. Device according to claim 2, characterized in that the blocking of the rod (24) is effected by means of a hydraulic pressure exerted on the outside of the sleeve (30). 4. Dispositif selon la revendication 2, caractérisé en ce que la douille (30) présente un alésage intérieur inférieur au diamètre de la tige (24), le blocage par frottement de cette dernière étant dû à la déformation élastique des matériaux en présence, le déblocage étant obtenu par une pression hydraulique appliquée uniformément entre les deux surfaces de contact.4. Device according to claim 2, characterized in that the sleeve (30) has an inner bore less than the diameter of the rod (24), the friction locking of the latter being due to the elastic deformation of the materials present, the unlocking being obtained by a hydraulic pressure applied uniformly between the two contact surfaces. 5. Procédé de réglage des poussoirs de presse-flan sur une presse selon l'une quelconque des revendications précédentes, caractérisé en ce que, les outillages ayant été montés : - on descend le coulisseau de serre-flan (8) en butée sur le coulisseau emboutisseur (6), - on débloque les tiges (24) des vérins (26) et on les descend jusqu'à ce qu'elles soient en butée contre le serre-flan (20), . - on commande automatiquement le blocage des tiges (24) à partir d'un signal détectant l'aug m éntation de pression hydraulique dans les vérins (26), - on bloque les extrémités (24a) des tiges (24) sur le serre-flan (20). 5. Method for adjusting the blank press pushers on a press according to any one of the preceding claims, characterized in that, the tools having been mounted: - the blank holder slide (8) is lowered into abutment on the stamping slide (6), - The rods (24) of the jacks (26) are released and lowered until they are in abutment against the blank holder (20),. the rods (24) are blocked automatically from a signal detecting the increase in hydraulic pressure in the jacks (26), - The ends (24a) of the rods (24) are blocked on the blank holder (20).
EP82400526A 1981-04-01 1982-03-23 Method and device for the automatic control of the press rams by means of cylinders with self blocking piston rods Expired EP0062562B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82400526T ATE13983T1 (en) 1981-04-01 1982-03-23 METHOD AND DEVICE FOR AUTOMATIC CONTROL OF THE SLIDES OF A PRESS BY MEANS OF A SELF-LOCKING PISTON-CYLINDER UNIT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8106526 1981-04-01
FR8106526A FR2502994A1 (en) 1981-04-01 1981-04-01 METHOD AND DEVICE FOR AUTOMATICALLY ADJUSTING PUSH-BUTTONS OF A BINDING PRESS USING SELF-LOCKING RODS

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EP0062562A1 true EP0062562A1 (en) 1982-10-13
EP0062562B1 EP0062562B1 (en) 1985-06-26

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EP82400526A Expired EP0062562B1 (en) 1981-04-01 1982-03-23 Method and device for the automatic control of the press rams by means of cylinders with self blocking piston rods

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US (1) US4483173A (en)
EP (1) EP0062562B1 (en)
JP (1) JPS57177839A (en)
AT (1) ATE13983T1 (en)
DE (1) DE3264389D1 (en)
FR (1) FR2502994A1 (en)

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Also Published As

Publication number Publication date
FR2502994B1 (en) 1983-07-01
EP0062562B1 (en) 1985-06-26
JPS57177839A (en) 1982-11-01
DE3264389D1 (en) 1985-08-01
US4483173A (en) 1984-11-20
ATE13983T1 (en) 1985-07-15
JPH0250814B2 (en) 1990-11-05
FR2502994A1 (en) 1982-10-08

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