EP0121484A1 - Press with compensation of the elongation of the columns during pressing - Google Patents

Press with compensation of the elongation of the columns during pressing Download PDF

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Publication number
EP0121484A1
EP0121484A1 EP84420038A EP84420038A EP0121484A1 EP 0121484 A1 EP0121484 A1 EP 0121484A1 EP 84420038 A EP84420038 A EP 84420038A EP 84420038 A EP84420038 A EP 84420038A EP 0121484 A1 EP0121484 A1 EP 0121484A1
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EP
European Patent Office
Prior art keywords
sleeve
cylinder
press
auxiliary
column
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EP84420038A
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German (de)
French (fr)
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Pierre Poncet
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
    • B21B31/04—Rolling stand frames or housings; Roll mountings ; Roll chocks with tie rods in frameless stands, e.g. prestressed tie rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
    • B30B15/245—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam using auxiliary cylinder and piston means as actuating members

Definitions

  • the present invention relates to presses in general, and more particularly to those for molding plastics by compression or injection.
  • presses in principle comprise two plates, one of which is fixed and the other movable to ensure the clamping of the two halves of the mold. It is essential that during this tightening the two plates remain perfectly parallel to each other.
  • the columns which connect the fixed plate to the support devices of the movable plate elastically elongate under the effect of the forces involved and as the fact that in general the molding imprint is not symmetrical, these forces are different for the various columns, the parallelism ensured at rest tends to disappear. It is therefore necessary to equip the presses with columns of exaggerated section so that their elongation remains negligible. This solution is costly and imperfect, especially for high-powered machines with large dimensions.
  • this cylinder is slaved to the hydraulic clamping pressure so as to impose on the sleeve a compression pre-stress equal to, or at least approximately equal to, the tensile force applied to the core of the column, so as to eliminate, or at least reduce to a large extent, the deformations of the sleeve during tightening of the press.
  • each auxiliary cylinder has the same section as the corresponding clamping cylinder and is supplied in parallel with it. The solution is then perfect.
  • the press an angle of which is very diagrammatically shown in FIG. 1, comprises a base 1 on which are mounted columns, generally four in number, each comprising a core 2, slidably surrounded by a sleeve 3 from which it protrudes in the upward direction to receive a fixed upper plate 4.
  • On this plate 4 carries the piston 5 of an annular auxiliary cylinder with a very short stroke, the cylinder 6 of which abuts against a retaining nut 7 screwed onto the core 2.
  • On the lower part of the sleeve 3 can slide a movable lower plate 8 actuated by a also annular clamping cylinder, comprising a piston 9 which bears against the plate 8 and a cylinder integral with said sleeve.
  • the two cylinders 5-6 and 9-10 have the same section and are connected in parallel.
  • the two halves 11 and 12 of the mold are clamped between the two plates 4 and 8.
  • the four clamping cylinders, here referenced 13-14 are not co-axial with columns 2-3. It follows that the irregularities of the forces developed by these jacks at points A, B, C, D of the plan view of FIG. 3 determine torques which are not perfectly balanced by those resulting from the forces which the auxiliary cylinders exert in E, F, G and H. But if the imprint of the mold is not too asymmetrical and if the distances AE, BF , CG and DH are not too large, the compensation of the forces is ensured to a sufficient extent so that the longitudinal deformations (contraction or extension) of the sleeves 3 remain negligible.
  • Fig. 4 indicates another kind of solution applicable in all cases and which does not require the use of auxiliary cylinders with multiple elements.
  • the outer body 16 of a hydraulic distributor has been fixed to it by a lateral arm 15.
  • Fig. 5 and 6 correspond to the case of a press with a profile in the form of an elongated rectangle in which the four clamping cylinders 13-14 are arranged in the longitudinal alignment of the four columns 2-3. It is easy to demonstrate algebraically that here the forces that each auxiliary cylinder must develop are a function of only two factors, namely the forces exerted by the two clamping cylinders 13-14 located on the same longitudinal line. It is therefore possible to establish each of these auxiliary cylinders in the form of two tandem elements 5a-6a, 5b-6b of appropriate sections, connected in parallel one to the tightening cylinder (13-14) closest to the longitudinal direction, the other to the cylinder furthest in the same direction.
  • 5a-6a, 5b-6b of appropriate sections
  • the press can include any suitable device for approach cylinders.
  • the movable plate 8 which was supposed to be the lower one, could on the contrary be the upper plate, in which case the part referenced 4 in the appended drawings would be a fixed support plate for a mobile plate which would be connected to it by the jacks of tightening such as 13-14.
  • the detector and corrector system 16-17 of fig. 4 could include a multiplier mechanism levers or the like to increase sensitivity. Columns 2-3 could be horizontal.
  • the invention is applicable not only to presses intended for molding, but also to all the others posing similar problems.

Abstract

Each column of a press comprises a core rod (2) surrounded in a sliding manner by a sleeve (3). The clamping ram (10) which is associated with the column in question acts on the movable plate (8) to clamp the mould (11, 12). The upper plate (4) transmits the reaction to the auxiliary ram (5-6) which, bearing on the core (2), applies a force to the plate (4) which is equal to that generated by the auxiliary ram. Thus, the sleeve is theoretically not subjected to any force. The rams (9, 10) and (5-6) may be fed in parallel. If the clamping ram (9-10) is not coaxial with the column, it is possible to manage with an approximative solution, either using, as auxiliary ram, an appropriately fed multiple ram in tandem or else detecting the deformations of the sleeve and controlling the auxiliary ram in such a way as to cancel them. <IMAGE>

Description

La présente invention se réfère aux presses en général, et plus particulièrement à celles à mouler les matières plastiques par compression ou par injection.The present invention relates to presses in general, and more particularly to those for molding plastics by compression or injection.

Ces presses comprennent en principe deux plateaux dont l'un est fixe et l'autre mobile pour assurer le serrage des deux moitiés du moule. Il est essentiel que lors de ce serrage les deux plateaux restent parfaitement parallèles l'un à l'autre. Or les colonnes qui relient le plateau fixe aux dispositifs d'appui du plateau mobile s'allongent élastiquement sous l'effet des forces mises en jeu et comme du fait qu'en général l'empreinte de moulage n'est pas symétrique, ces forces sont différentes pour les diverses colonnes, le parallélisme assuré au repos tend à disparaître. On est donc amené à équiper les presses de colonnes de section exagérée pour que leur allongement reste négligeable. Cette solution est coûteuse et imparfaite, notamment pour les machines de forte puissance et de grandes dimensions.These presses in principle comprise two plates, one of which is fixed and the other movable to ensure the clamping of the two halves of the mold. It is essential that during this tightening the two plates remain perfectly parallel to each other. However, the columns which connect the fixed plate to the support devices of the movable plate elastically elongate under the effect of the forces involved and as the fact that in general the molding imprint is not symmetrical, these forces are different for the various columns, the parallelism ensured at rest tends to disappear. It is therefore necessary to equip the presses with columns of exaggerated section so that their elongation remains negligible. This solution is costly and imperfect, especially for high-powered machines with large dimensions.

Dans le brevet français 2 204 490 on a décrit une presse à colonnes constituées chacune par une âme centrale et par un manchon entourant celle-ci à coulissement, un vérin auxiliaire pré-contraignant l'âme à la traction et le manchon à la compression sous une charge fixe substantiellement égale à celle maximale prévue pour la colonne considérée. Mais cette solution supposait le manchon pratiquement incompressible, donc là encore de très forte section et par conséquent encombrant et coûteux.In French patent 2,204,490, a column press has been described, each consisting of a central core and a sleeve surrounding the latter with sliding action, an auxiliary jack pre-constraining the core in tension and the sleeve in compression under a fixed load substantially equal to the maximum provided for the column in question. However, this solution supposed the sleeve to be practically incompressible, therefore again of very large cross section and therefore bulky and expensive.

Conformément à la présente invention, dans une presse comportant des colonnes dont chacune est ainsi constituée par une âme centrale entourée à coulissement par un manchon, tandis qu'un vérin auxiliaire est disposé entre ces deux organes pour pré-contraindre l'âme à la traction et le manchon à la compression, ce vérin est asservi à la pression hydraulique de serrage de façon à imposer au manchon une pré-contrainte de compression égale, ou au moins approximativement égale, à la force de traction appliquée à l'âme de la colonne, de manière à supprimer, ou à tout le moins à réduire dans une large mesure, les déformations du manchon lors du serrage de la presse.According to the present invention, in a press comprising columns, each of which is thus constituted by a central core surrounded by sliding by a sleeve, while an auxiliary jack is disposed between these two members to pre-constrain the core to traction and the compression sleeve, this cylinder is slaved to the hydraulic clamping pressure so as to impose on the sleeve a compression pre-stress equal to, or at least approximately equal to, the tensile force applied to the core of the column, so as to eliminate, or at least reduce to a large extent, the deformations of the sleeve during tightening of the press.

Si les vérins de serrage de la presse sont co-axiaux aux colonnes, il suffit évidemment que chaque vérin auxiliaire ait la même section que le vérin de serrage correspon- pondant et soit alimenté en parallèle avec lui. La solution est alors parfaite.If the clamping cylinders of the press are co-axial with the columns, it is obviously sufficient that each auxiliary cylinder has the same section as the corresponding clamping cylinder and is supplied in parallel with it. The solution is then perfect.

Dans le cas de vérins de serrage non co-axiaux aux colonnes, s'ils sont en nombre égal à celui des colonnes et s'il existe pour chacune de celles-ci un tel vérin relativement rapproché d'elle, on peut également prévoir de brancher en parallèle ce vérin et le vérin auxiliaire correspondant à la colonne considérée. La solution n'est pas parfaite, mais elle peut être suffisante dans bien des cas.In the case of clamping cylinders which are not co-axial to the columns, if there are a number equal to that of the columns and if there exists for each of these a cylinder relatively close to it, provision may also be made for connect this cylinder in parallel with the auxiliary cylinder corresponding to the column in question. The solution is not perfect, but it may be sufficient in many cases.

On peut encore déterminer algébriquement la charge imposée à chaque colonne et prévoir les vérins auxiliaires en conséquence. Cette solution est également parfaite, mais elle oblige à réaliser les vérins auxiliaires sous forme multiple à éléments en tandem.We can still algebraically determine the load imposed on each column and plan the auxiliary cylinders accordingly. This solution is also perfect, but it requires the auxiliary cylinders to be produced in multiple form with tandem elements.

Enfin il est possible d'associer à chaque manchon un détecteur de déformation et un distributeur hydraulique qui commande le vérin auxiliaire de manière qu'il fasse disparaître la déformation ainsi décelée. Là encore la solution est théoriquement parfaite.Finally, it is possible to associate with each sleeve a deformation detector and a hydraulic distributor which controls the auxiliary jack so that it eliminates the deformation thus detected. Again the solution is theoretically perfect.

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :

  • Fig. 1 est une coupe verticale partielle montrant l'un des angles d'une presse équipée de vérins auxiliaires suivant une première forme d'exécution de l'invention.
  • Fig. 2 est une vue en élévation d'une autre forme d'exécution.
  • Fig. 3 est une vue en plan correspondant à fig. 2.
  • Fig. 4 est une coupe partielle semblable à celle de fig. 1, mais concernant une troisième forme d'exécution.
  • Fig. 5 est une vue en élévation avec coupe partielle d'une presse dans laquelle les vérins de serrage sont dans l'alignement longitudinal des colonnes, les vérins auxiliaires étant réalisés sous la forme de deux éléments en tandem.
  • Fig. 6 est la vue en plan correspondant à fig. 5.
The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
  • Fig. 1 is a partial vertical section showing one of the angles of a press equipped with auxiliary jacks according to a first embodiment of the invention.
  • Fig. 2 is an elevational view of another embodiment.
  • Fig. 3 is a plan view corresponding to FIG. 2.
  • Fig. 4 is a partial section similar to that of FIG. 1, but concerning a third embodiment.
  • Fig. 5 is an elevational view in partial section of a press in which the clamping cylinders are in the longitudinal alignment of the columns, the auxiliary cylinders being produced in the form of two elements in tandem.
  • Fig. 6 is the plan view corresponding to FIG. 5.

La presse dont on a très schématiquement représenté un angle en fig. 1, comprend un socle 1 sur lequel sont montées des colonnes, généralement au nombre de quatre, chacune comprenant une âme 2, entourée à coulissement par un manchon 3 dont elle dépasse en direction du haut pour recevoir un plateau supérieur fixe 4. Sur ce plateau 4 porte le piston 5 d'un vérin auxiliaire annulaire à très faible course dont le cylindre 6 bute contre un écrou de retenue 7 vissé sur l'âme 2. Sur la partie basse du manchon 3 peut coulisser un plateau inférieur mobile 8 actionné par un vérin de serrage également annulaire, comprenant un piston 9 qui porte contre le plateau 8 et un cylindre solidaire dudit manchon.The press, an angle of which is very diagrammatically shown in FIG. 1, comprises a base 1 on which are mounted columns, generally four in number, each comprising a core 2, slidably surrounded by a sleeve 3 from which it protrudes in the upward direction to receive a fixed upper plate 4. On this plate 4 carries the piston 5 of an annular auxiliary cylinder with a very short stroke, the cylinder 6 of which abuts against a retaining nut 7 screwed onto the core 2. On the lower part of the sleeve 3 can slide a movable lower plate 8 actuated by a also annular clamping cylinder, comprising a piston 9 which bears against the plate 8 and a cylinder integral with said sleeve.

Les deux vérins 5-6 et 9-10 ont la même section et sont branchés en parallèle.The two cylinders 5-6 and 9-10 have the same section and are connected in parallel.

Les deux moitiés 11 et 12 du moule sont serrées entre les deux plateaux 4 et 8.The two halves 11 and 12 of the mold are clamped between the two plates 4 and 8.

On comprend que lors du serrage la poussée vers le haut exercée par le vérin 9-10 est transmise au plateau fixe 4, lequel reçoit du vérin auxiliaire 5-6 une poussée vers le bas de valeur exactement égale. Ces deux poussées s'annulent et par conséquent le manchon 3 n'est pas chargé et ne se contracte pas. Le plateau 4 reste donc toujours à la même position par rapport au socle 1. L'effort de serrage est finalement supporté par les âmes de colonne 2, lesquelles peuvent s'allonger sans que cela influe sur la position du plateau 4.It is understood that during tightening the upward thrust exerted by the jack 9-10 is transmitted to the fixed plate 4, which receives from the auxiliary cylinder 5-6 a downward push of exactly equal value. These two thrusts cancel each other out and consequently the sleeve 3 is not loaded and does not contract. The plate 4 therefore always remains in the same position relative to the base 1. The tightening force is ultimately supported by the column cores 2, which can lengthen without affecting the position of the plate 4.

Pour tenir compte des tolérances, des frottements et des incidents de fonctionnement possibles, on prend cependant soin de fixer solidement le manchon 3 au socle 1 et au plateau fixe 4.To take account of tolerances, friction and possible operating incidents, care is however taken to securely fix the sleeve 3 to the base 1 and to the fixed plate 4.

Dans la forme d'exécution de fig. 2 et 3, les quatre vérins de serrage, ici référencés 13-14 ne sont pas co-axiaux aux colonnes 2-3. Il en résulte que les irrégularités des efforts développés par ces vérins aux points A, B, C, D de la vue en plan de fig. 3 déterminent des couples qui ne sont pas parfaitement équilibrés par ceux résultant des forces que les vérins auxiliaires exercent en E, F, G et H. Mais si l'empreinte du moule n'est pas par trop asymétrique et si les distances AE, BF, CG et DH ne sont pas trop grandes, la compensation des efforts est assurée dans une mesure suffisante pour que les déformations longitudinales (contraction ou extension) des manchons 3 restent négligeables.In the embodiment of fig. 2 and 3, the four clamping cylinders, here referenced 13-14 are not co-axial with columns 2-3. It follows that the irregularities of the forces developed by these jacks at points A, B, C, D of the plan view of FIG. 3 determine torques which are not perfectly balanced by those resulting from the forces which the auxiliary cylinders exert in E, F, G and H. But if the imprint of the mold is not too asymmetrical and if the distances AE, BF , CG and DH are not too large, the compensation of the forces is ensured to a sufficient extent so that the longitudinal deformations (contraction or extension) of the sleeves 3 remain negligible.

Connaissant d'ailleurs les positions des huit points A à H on peut algébriquement déterminer les efforts que les vérins auxiliaires 5-6 doivent exercer, mais pour chacun d'eux l'effort en question est la somme de plusieurs facteurs, ce qui oblige alors à le réaliser sous la forme de plusieurs éléments en tandem.Knowing moreover the positions of the eight points A to H we can algebraically determine the forces that the auxiliary cylinders 5-6 must exert, but for each of them the force in question is the sum of several factors, which then requires to realize it in the form of several elements in tandem.

Fig. 4 indique un autre genre de solution applicable à tous les cas et qui n'exige pas l'utilisation de vérins auxiliaires à éléments multiples. Ici, vers l'extrémité supérieure de chaque manchon 3 l'on a fixé à celui-ci par un bras latéral 15 le corps extérieur 16 d'un distributeur hydraulique à trois voies de haute précision, tandis que le tiroir intérieur correspondant 17 est fixé à une tige verticale 18 dont l'extrémité inférieure est à son tour fixée au socle 1 en 19. On comprend que dans ces conditions le système 16-18 détecte le début des déformations des manchons 3 et les corrige aussitôt, quels que soient le nombre et les positions des vérins de serrage tels que 12-13.Fig. 4 indicates another kind of solution applicable in all cases and which does not require the use of auxiliary cylinders with multiple elements. Here, towards the upper end of each sleeve 3, the outer body 16 of a hydraulic distributor has been fixed to it by a lateral arm 15. three high-precision channels, while the corresponding internal drawer 17 is fixed to a vertical rod 18, the lower end of which is in turn fixed to the base 1 at 19. It is understood that under these conditions the system 16-18 detects the start deformations of the sleeves 3 and corrects them immediately, regardless of the number and positions of the clamping cylinders such as 12-13.

Fig. 5 et 6 correspondent au cas d'une presse à profil en forme de rectangle allongé dans laquelle les quatre vérins de serrage 13-14 sont disposés dans l'alignement longitudinal des quatre colonnes 2-3. Il est facile de démontrer algébriquement qu'ici les efforts que chaque vérin auxiliaire doit développer sont fonction de deux facteurs seulement, savoir les forces exercées par les deux vérins de serrage 13-14 situés sur la même ligne longitudinale. On peut donc établir chacun de ces vérins auxiliaires sous forme de deux éléments en tandem 5a-6a, 5b-6b de sections appropriées, reliés en parallèle l'un au vérin de serrage (13-14) le plus rapproché dans le sens longitudinal, l'autre au vérin le plus éloigné dans ce même sens. On réalise ici encore une solution théoriquement parfaite, sans complications exagérées.Fig. 5 and 6 correspond to the case of a press with a profile in the form of an elongated rectangle in which the four clamping cylinders 13-14 are arranged in the longitudinal alignment of the four columns 2-3. It is easy to demonstrate algebraically that here the forces that each auxiliary cylinder must develop are a function of only two factors, namely the forces exerted by the two clamping cylinders 13-14 located on the same longitudinal line. It is therefore possible to establish each of these auxiliary cylinders in the form of two tandem elements 5a-6a, 5b-6b of appropriate sections, connected in parallel one to the tightening cylinder (13-14) closest to the longitudinal direction, the other to the cylinder furthest in the same direction. Here again we realize a theoretically perfect solution, without exaggerated complications.

On notera qu'en fig. 5 et 6 tous les vérins (vérins de serrage et vérins auxiliaires) ont été représentés comme étant à double effet, alors qu'en fig. 1 à 4 on avait supposé pour simplifier qu'ils n'étaient qu'à simple effet. Il est bien évident pour tout technicien qu'en pratique c'est la réalisation à double effet qu'il convient d'adopter au moins pour les vérins de serrage.Note that in fig. 5 and 6 all the jacks (clamping jacks and auxiliary jacks) have been shown to be double acting, while in fig. 1 to 4 we had supposed to simplify that they were only simple effect. It is quite obvious for any technician that in practice it is the double-effect realization that should be adopted at least for the clamping cylinders.

Bien entendu, la presse peut comporter tout dispositif approprié de vérins d'approche. Le plateau mobile 8, qu'on a supposé être celui inférieur, pourrait au contraire être le plateau supérieur, auquel cas la pièce référencée 4 aux dessins annexés serait un plateau d'appui fixe pour un plateau mobile qui lui serait relié par les vérins de serrage tels que 13-14. Le système détecteur et correcteur 16-17 de fig. 4 pourrait comporter un mécanisme multiplicateur à leviers ou autre pour en augmenter la sensibilité. Les colonnes 2-3 pourraient être horizontales. Par ailleurs l'invention est applicable non seulement aux presses destinées au moulage, mais également à toutes les autres posant des problèmes analogues.Of course, the press can include any suitable device for approach cylinders. The movable plate 8, which was supposed to be the lower one, could on the contrary be the upper plate, in which case the part referenced 4 in the appended drawings would be a fixed support plate for a mobile plate which would be connected to it by the jacks of tightening such as 13-14. The detector and corrector system 16-17 of fig. 4 could include a multiplier mechanism levers or the like to increase sensitivity. Columns 2-3 could be horizontal. Furthermore, the invention is applicable not only to presses intended for molding, but also to all the others posing similar problems.

Claims (6)

1. Presse comportant des colonnes dont chacune est constituée par une âme centrale entourée à coulissement par un manchon, tandis qu'un vérin auxiliaire est disposé entre ces deux organes pour pré-contraindre l'âme à la traction et le manchon à la compression, caractérisée en ce que ce vérin auxiliaire (5-6) est asservi à la pression hydraulique de serrage de façon à imposer au manchon (3) une pré-contrainte de compression égale, ou au moins approximativement égale, à la force de traction imposée à l'âme (2) de la colonne, de manière à supprimer, ou à tout le moins à réduire dans une large mesure, les déformations du manchon (3) lors du serrage de la presse.1. Press comprising columns, each of which consists of a central core slidingly surrounded by a sleeve, while an auxiliary jack is disposed between these two members to pre-constrain the core to traction and the sleeve to compression, characterized in that this auxiliary cylinder (5-6) is slaved to the hydraulic clamping pressure so as to impose on the sleeve (3) a compressive pre-stress equal, or at least approximately equal, to the traction force imposed on the core (2) of the column, so as to eliminate, or at least reduce to a large extent, the deformations of the sleeve (3) when the press is tightened. 2. Presse suivant la revendication 1, dans laquelle les vérins de serrage sont co-axiaux aux colonnes, caractérisée en ce que chaque vérin auxiliaire (5-6) est de section substantiellement égale à celle du vérin de serrage (9-10) correspondant à la même colonne (2-3) et est alimenté en parallèle avec celui-ci.2. Press according to claim 1, in which the clamping cylinders are co-axial with the columns, characterized in that each auxiliary cylinder (5-6) is of section substantially equal to that of the corresponding clamping cylinder (9-10) to the same column (2-3) and is fed in parallel with it. 3. Presse suivant la revendication, dans laquelle les vérins de serrage sont en nombre égal à celui des colonnes, chacun d'eux étant disposé relativement près de l'une de celles-ci, caractérisée en ce que chaque vérin auxiliaire (5-6) a la même section que le vérin de serrage (13-14) voisin de la colonne (2-3) correspondante et est alimenté en parallèle avec lui.3. Press according to claim, wherein the clamping cylinders are in number equal to that of the columns, each of them being disposed relatively close to one of them, characterized in that each auxiliary cylinder (5-6 ) has the same section as the clamping cylinder (13-14) adjacent to the corresponding column (2-3) and is supplied in parallel with it. 4. Presse suivant la revendication 1, caractérisée en ce qu'à chaque manchon (3) sont associés un détecteur sensible aux déformations de celui-ci sous l'effet de la pression hydraulique de serrage de la presse, et un distributeur hydraulique commandé par ce détecteur, ce distributeur étant relié au vérin auxiliaire (5-6) correspondant à ce manchon (3) de façon à le commander de manière qu'il s'oppose à la déformation décelée par le détecteur.4. Press according to claim 1, characterized in that each sleeve (3) is associated with a detector sensitive to deformations thereof under the effect of the hydraulic clamping pressure of the press, and a hydraulic distributor controlled by this detector, this distributor being connected to the auxiliary jack (5-6) corresponding to this sleeve (3) so as to control it so that it opposes the deformation detected by the detector. 5. Presse suivant la revendication 4, caractérisée en ce que le détecteur et le distributeur hydraulique sont combinés sous la forme d'un distributeur (16-17) à tiroir coulissant (17) dont l'une des deux parties constitutives [corps (16) et tiroir intérieur (17)] est fixée à l'extrémité du manchon (3) qui reçoit la réaction de serrage et l'autre à une tige (18) parallèle à la colonne (2-3) et elle-même fixée à l'autre extrémité de ce manchon (3).5. Press according to claim 4, characterized in that the detector and the hydraulic distributor are combined in the form of a distributor (16-17) with sliding drawer (17), one of the two constituent parts [body (16 ) and internal drawer (17)] is fixed to the end of the sleeve (3) which receives the tightening reaction and the other to a rod (18) parallel to the column (2-3) and itself fixed to the other end of this sleeve (3). 6. Presse suivant la revendication 1, à profil en plan rectangulaire, dans laquelle les quatre vérins de serrage sont disposés deux à deux dans l'alignement longitudinal des quatre colonnes, caractérisée en ce que chaque vérin auxiliaire est réalisé sous la forme de deux éléments en tandem (5a,6a ; 5b-6b), chaque élément, prévu de section appropriée, étant relié en parallèle le premier au vérin de serrage adjacent dans le sens longitudinal, le second au vérin le plus éloigné dans ce même sens.6. Press according to claim 1, profile in rectangular plane, wherein the four clamping cylinders are arranged in pairs in the longitudinal alignment of the four columns, characterized in that each auxiliary cylinder is produced in the form of two elements in tandem (5a, 6a; 5b-6b), each element, provided with an appropriate section, being connected in parallel the first to the adjacent tightening cylinder in the longitudinal direction, the second to the most distant cylinder in this same direction.
EP84420038A 1983-03-04 1984-03-05 Press with compensation of the elongation of the columns during pressing Ceased EP0121484A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8303803A FR2541934B1 (en) 1983-03-04 1983-03-04 DEVICE FOR ADJUSTING PARALLELISM AND PLANEITY OF PLATES IN MOLDING PRESSES
FR8303803 1983-03-04

Publications (1)

Publication Number Publication Date
EP0121484A1 true EP0121484A1 (en) 1984-10-10

Family

ID=9286626

Family Applications (2)

Application Number Title Priority Date Filing Date
EP84420038A Ceased EP0121484A1 (en) 1983-03-04 1984-03-05 Press with compensation of the elongation of the columns during pressing
EP84420037A Expired EP0122205B1 (en) 1983-03-04 1984-03-05 Precision hydraulic control valve, especially for moulding presses

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP84420037A Expired EP0122205B1 (en) 1983-03-04 1984-03-05 Precision hydraulic control valve, especially for moulding presses

Country Status (4)

Country Link
EP (2) EP0121484A1 (en)
AT (1) ATE24028T1 (en)
DE (1) DE3461553D1 (en)
FR (1) FR2541934B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003095187A1 (en) * 2001-10-18 2003-11-20 Hartwick Professionals, Inc. Compression molding using a self-aligning and activating mold system
CN105327974A (en) * 2015-12-01 2016-02-17 盐城工学院 Device for counting numbers and detecting parallelism degree of stamping die and parallelism degree detecting method thereof
CN106427039A (en) * 2016-11-30 2017-02-22 无锡市创恒机械有限公司 Uniform pressurizing device for workpiece
CN115206036A (en) * 2022-09-13 2022-10-18 江苏振华新云电子有限公司 Detection frame strip leveling alarm device for working of molding press

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1703297A1 (en) * 1968-04-29 1972-02-17 Freudenberg Carl Fa Hot plate press with self-compensating cylinder piston arrangements
DE2245049A1 (en) * 1972-09-14 1974-03-21 Siempelkamp Gmbh & Co Hydraulic press with measuring staff in column - to supervise preload and obt more accurate moulding
DE2431585A1 (en) * 1974-07-01 1976-01-22 4 P Verpackungen Gmbh Compensating system for press tension rods - compensates thermal and other deformations by direct hydraulic pressure
FR2345247A1 (en) * 1976-03-24 1977-10-21 Pahnke Engineering Forging press or drop hammer - has channel section side members to resist bending and tie rods to resist tension

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Publication number Priority date Publication date Assignee Title
DE1007627B (en) * 1953-11-30 1957-05-02 Merklinger Maschinenfabrik G M Control valve with piston slide for hydraulic presses
FR1122619A (en) * 1955-02-25 1956-09-11 Accumulation servo motor
US3064426A (en) * 1959-06-22 1962-11-20 Dba Sa Hydraulic systems
FR2204490B1 (en) * 1972-10-27 1976-10-29 Poncet Pierre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1703297A1 (en) * 1968-04-29 1972-02-17 Freudenberg Carl Fa Hot plate press with self-compensating cylinder piston arrangements
DE2245049A1 (en) * 1972-09-14 1974-03-21 Siempelkamp Gmbh & Co Hydraulic press with measuring staff in column - to supervise preload and obt more accurate moulding
DE2431585A1 (en) * 1974-07-01 1976-01-22 4 P Verpackungen Gmbh Compensating system for press tension rods - compensates thermal and other deformations by direct hydraulic pressure
FR2345247A1 (en) * 1976-03-24 1977-10-21 Pahnke Engineering Forging press or drop hammer - has channel section side members to resist bending and tie rods to resist tension

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003095187A1 (en) * 2001-10-18 2003-11-20 Hartwick Professionals, Inc. Compression molding using a self-aligning and activating mold system
CN105327974A (en) * 2015-12-01 2016-02-17 盐城工学院 Device for counting numbers and detecting parallelism degree of stamping die and parallelism degree detecting method thereof
CN105327974B (en) * 2015-12-01 2019-03-15 盐城工学院 Stamping die mould time counts and parallelism detecting device and its parallelism detection method
CN106427039A (en) * 2016-11-30 2017-02-22 无锡市创恒机械有限公司 Uniform pressurizing device for workpiece
CN115206036A (en) * 2022-09-13 2022-10-18 江苏振华新云电子有限公司 Detection frame strip leveling alarm device for working of molding press
CN115206036B (en) * 2022-09-13 2022-12-06 江苏振华新云电子有限公司 Detection frame strip leveling alarm device for working of molding press

Also Published As

Publication number Publication date
FR2541934B1 (en) 1986-10-17
ATE24028T1 (en) 1986-12-15
FR2541934A1 (en) 1984-09-07
DE3461553D1 (en) 1987-01-15
EP0122205B1 (en) 1986-12-03
EP0122205A1 (en) 1984-10-17

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