EP0434541A1 - Hydraulic bending press with movable lower beam - Google Patents
Hydraulic bending press with movable lower beam Download PDFInfo
- Publication number
- EP0434541A1 EP0434541A1 EP19900403636 EP90403636A EP0434541A1 EP 0434541 A1 EP0434541 A1 EP 0434541A1 EP 19900403636 EP19900403636 EP 19900403636 EP 90403636 A EP90403636 A EP 90403636A EP 0434541 A1 EP0434541 A1 EP 0434541A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- deck
- pressure
- movable
- torque
- comparator
- 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
Links
Images
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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0272—Deflection compensating means
-
- 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
Definitions
- the present invention relates to hydraulic press brakes for the deformation of sheet metals.
- press brakes of the type comprising a fixed upper deck and a movable lower deck actuated by at least three hydraulic cylinders, two of which are arranged at the lateral ends of the movable deck and at least one in the center, these cylinders being supplied from a unique directional distribution system controlling the up and down movements of the mobile platform.
- the type of machine to which the invention applies according to the present application is very specific. In fact, it uses a single pressure source, a single distribution for controlling the movements and at least three working jacks, at least one of which is placed in the center.
- the techniques used to date usually relate to presses with two upper cylinders and involve a servo-distribution member per cylinder fitted to the machine.
- the pressure built up in the cylinder is solely as a function of the reaction of the work opposed to the movement of this cylinder, the servo-distributor controlling a volume of oil supplying the cylinder.
- control devices of this same nature with servo-distribution, on a press with three jacks, would not allow more under eccentric load conditions to control the parallelism of deformation of the facing edges. Indeed, the pressure being established in each cylinder is only a function of the force exerted by the work in front of this cylinder and nothing under these conditions allows to act voluntarily on these pressures and therefore on the deformations .
- US Patent 2,343,167 offers a different approach to the recovery of eccentric forces.
- This patent enslaves the overall parallelism of the work platform, or mobile working apron, to the position of a mobile reference element.
- This reference element not being subjected to any work effort, it completely disregards the concept of parallel deformed shapes.
- the hydraulic balancing device uses a variable throttle member preset by the operator during preliminary tests, and therefore does not automatically adapt as needed to overcome eccentricity.
- the preset is an all-or-nothing adjustment controlled by microswitches.
- FR 2,545,418 basically relates to the search for the optimization of the parallelism of the faces opposite the aprons and clearly highlights the importance thereof.
- FR 2,545,418 implements to obtain this result additional support points of one of the decks carried by auxiliary crosspieces in the same way as French patent 2,347,992, and adds one or more additional camber cylinders of the 'other deck, carried themselves by auxiliary crosspieces.
- the present application relates to a hydraulic circuit making it possible, while retaining this basic configuration of these folding machines, to keep them whatever the working conditions centered or eccentric, the overall parallelism of the lower and upper decks as well that the optimization of the parallelism of the faces opposite these aprons.
- the object of the invention is to control the force exerted by each of the jacks acting on the movable bulkhead to ensure on the one hand the overall parallelism and on the other hand, by acting on the force applied by each of the jacks for the same value of opposing torque, to generate a deformation curve of the movable lower deck, thus ensuring optimal parallel deformation of the two decks.
- the invention relates to a press brake for the deformation of sheet metals, comprising a fixed upper deck and a movable lower deck actuated by at least three hydraulic cylinders, two of which are arranged at the lateral ends of the movable deck and at least one in the center.
- the cylinders being supplied from a hydraulic circuit comprising a pump driven by a motor, a directional distributor controlling the movements of raising and lowering of the movable platform, a device for detecting the possible presence of a tilting torque on the movable deck, and a comparator and computer system connected to the detection device and comprising control outputs of a regulation system according to the detected tilting, characterized in that all the jacks are connected to a common directional distributor by means of pressure control means controlled by the sy stema comparator and calculator, the latter being capable of controlling a continuous reduction of the pressure exerted on the jack situated on the side opposite to the direction of the tilting torque, and possibly also on the jack situated in the center, so as to create a torque antagonistic as a function of the data received from the detection device, this antagonistic couple being capable on the one hand of counterbalancing in a continuous and proportional manner the tilting torque thus guaranteeing the overall parallelism and on the other hand ensuring the maintenance in parallel work areas on
- the means provided for ensuring pressure control on one or more of the jacks, actuating the movable lower bulkhead, can give rise to different embodiments.
- the device for detecting any tilting of the movable apron as well as the comparator and calculator device can be the subject of various embodiments.
- the press brake shown in Figures 1 and 2 is of the type comprising a fixed upper deck 1 and a movable lower deck 2.
- the upper deck is carried by a frame comprising two transverse flanges 3.
- this apron 2 is actuated by three single-acting hydraulic cylinders arranged symmetrically with respect to the median vertical axis XY of the machine. Two of these jacks 5a and 5b are arranged near one and the other end sides of the deck 2. As for the third jack 5c, it is placed in the center along the axis XY. These cylinders are supported on the vertical panels 4 of the machine frame and they are intended to ensure the vertical displacements of the deck 2 and to apply the desired working force therefrom from bottom to top, when bending a sheet 7 between two tools adapted to this press, in this case a punch 8 carried by the fixed upper deck 1 and a die 9 carried by the movable lower deck 2.
- This last deck is guided by four pairs of rollers 10 mounted freely rotatable on it and which are placed in contact with vertical guide tracks provided respectively on a fixed spacer 11 secured to the crosspieces 4 of the frame, and on the fixed body of the central jack 5c .
- the three jacks 5a, 5b, 5c are supplied from a directional distributor 12 as can be seen by referring to the diagram of the hydraulic control circuit, which is shown in FIG. 3.
- This circuit also includes a pump 13 driven by a motor 14.
- the movement of the distributor slide 12 in one direction or the other makes it possible to move the lower apron 2 up or down, this latter movement being effected by the action of the weight of the apron.
- the present hydraulic circuit further comprises pressure control means in the form of proportional pressure reducers 15a, 15b and 15c in number equal to the working cylinders of the movable deck.
- pressure control means in the form of proportional pressure reducers 15a, 15b and 15c in number equal to the working cylinders of the movable deck.
- Each of these pressure reducers is associated with one of these cylinders, as shown in the diagram in FIG. 3. Consequently by acting on one and / or the other of these reducers, it is possible to reduce continuously the control pressure of the corresponding jack (s).
- a detection device is also provided for detecting any tilting of the movable lower deck 2 when using this press.
- this device is designed to be able to detect both the appearance of such a tilting and the direction thereof.
- the detection device thus provided is constituted by two linear displacement sensors, provided at one and the other end of the lower deck 2.
- These sensors designated by the general references 16a and 16b, can be digital sensors with optical reading, or analog sensors with inductive, potentiometric or other effect.
- each of these sensors has a movable index 22 carried by the deck 2 and which moves opposite a fixed vertical strip 23 secured to one of the crosspieces 4 of the frame, or vice vice versa.
- Each of these sensors is therefore capable of measuring the displacement stroke of the corresponding end of the movable platform 2.
- Each of these two sensors is capable of emitting an electrical signal which is a function of the extent of the displacement measured.
- these two sensors are connected to an electronic circuit comprising a comparator and computer system 24 to which they are connected (see FIG. 5) and which comprises power outputs A, B and C connected to the control members of the reducers 15a, 15b, 15c .
- the comparator / calculator is able to determine if there is displacement identity or if on the contrary there is a difference corresponding to a tilting of the lower deck 2. This comparator is then able to determine both the importance of the torque of tilting, and the meaning of it.
- the comparator and computer 24 has an input E through which the data are entered. defining the general working conditions. This instruction can be carried out during programming if the entry of information is entirely manual as is generally the case on a numerical control, and / or at the start of the work operation if the entry of information is obtained by a system. probe, microswitches or any other form of sheet metal presence detectors or force zones such as strain gauges.
- the working conditions are differentiated by the nominal position of the sheet, that is to say that which does not take into account positioning errors, by its length, its thickness and the type of tool used. It should be considered that this information is part of that usually communicated to the digital control of the press brake when fitted; in this case, only one transfer of information takes place via input E from the digital control.
- the folding can be normal, centered with the simple possibility of accidental off-centering, it can be partially off-center or include operations of different natures: folding, punching or striking which can be carried out on tool units, some of which are strongly off-center.
- the deformations of the aprons are essentially a function of the nature of these working conditions. This is why the comparator and computer must take account of the information supplied at the input E, in addition to that received from the sensors 16a and 16b to calculate the magnitude of the signals supplied to the outputs A, B, C and transmitted to the reducers 15a, 15b, 15c, respectively to the reduction gear 15 and to the connection valves 21a, 21b, 21c according to an embodiment described with reference to FIG. 4.
- These orders can be in particular either the metered supply of output A alone or the differentiated supply of outputs A and C for the tilting in one direction, either the metered supply of output B alone, or the differentiated supply of outputs B and C for tilting in the other direction.
- FIG. 4 shows another embodiment of the hydraulic control circuit of this press brake. This embodiment differs from the previous one in that only one pressure reducer is designated, designated by the general reference 15.
- the hydraulic circuit for controlling the three cylinders 5a, 5b and 5c is arranged so that it is possible to apply to each cylinder, either the normal pressure coming from the pump 13, or a reduced pressure, the value of which is determined by the single reducer 15.
- three connection valves 21a, 21b and 21c are provided, each of which is associated with one of the jacks and makes it possible to apply to it either the normal pressure or the reduced pressure determined by the reducer 15.
- connection valves 21a, 21b and 21c are connected, like the pressure reducer (15), to the comparator-computer.
- this comparator-computer simultaneously supplies the pressure reducer (15) and two of the valves 21a, 21b, 21c, to cause a reduction in pressure on the central jack and the jack work located on the side opposite to that where off-center work is carried out. This creates an antagonistic couple counterbalancing the tilting torque and restoring overall parallelism.
- the device for detecting the appearance of a tilting torque on the movable lower bulkhead could be produced differently from what is provided in the case of the two examples described above where monitoring of a difference in displacement of one end of the movable deck relative to the other.
- a detection system comprising several strain gauges suitably arranged to detect differences in forces exerted on one and the other parts of the movable deck. The strain gauges thus provided would then be connected to a comparator / calculator circuit making it possible to determine both the appearance of a difference between the forces exerted and the direction of this difference.
- the pressure reducing means could also be produced in a different way provided that these make it possible to achieve a pressure reduction, not globally for all of the working cylinders of the movable lower bulkhead, but for each of these jacks taken alone or more of them.
- the present invention thus makes it possible to preserve the structure of the machines comprising a single pressure source, a single distribution for controlling the movements, and at least three working jacks, one of which at least disposed in the center, this under the general conditions of mechanical production. of these machines while allowing centered or eccentric work under conditions that maintain overall parallelism and the optimization of parallelism of the faces opposite the upper and lower decks.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Control Of Presses (AREA)
- Press Drives And Press Lines (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
- Presses And Accessory Devices Thereof (AREA)
- Glass Compositions (AREA)
- Laminated Bodies (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
La présente invention est relative aux presses plieuses hydrauliques pour la déformation des métaux en feuilles.The present invention relates to hydraulic press brakes for the deformation of sheet metals.
Plus précisément, elle concerne les presses plieuses du type comportant un tablier supérieur fixe et un tablier inférieur mobile actionné par au moins trois vérins hydrauliques dont deux sont disposés aux extrémités latérales du tablier mobile et au moins un au centre, ces vérins étant alimentés à partir d'un système de distribution directionnel unique commandant les mouvements de montée et descente du tablier mobile.More specifically, it relates to press brakes of the type comprising a fixed upper deck and a movable lower deck actuated by at least three hydraulic cylinders, two of which are arranged at the lateral ends of the movable deck and at least one in the center, these cylinders being supplied from a unique directional distribution system controlling the up and down movements of the mobile platform.
Les machines de ce genre ont pour avantage qu'il se produit, pendant le travail, une déformation parallèle des bords en regard des deux tabliers, grâce au fait que l'effort de poussée des vérins sur le tablier inférieur mobile est réparti de façon uniforme le long de ce tablier mobile afin de réaliser lors du travail des angles de pliage constants et précis. Cette géométrie de machine est celle des machines décrites dans le brevet français 1.362.471. Dans ces machines, il est prévu des moyens de guidage destinés à maintenir le tablier mobile parallèle au tablier supérieur fixe, pendant ses déplacements. En général, ces moyens de guidage consistent en des galets rotatifs portés par le tablier mobile et placés au contact de pistes de guidage prévues sur des éléments fixes du bâti. Toutefois, ces moyens de guidage mécanique se révèlent insuffisants dans le cas où la résultante des forces, dues au travail effectué, n'est pas située dans l'axe de la machine. En effet dans un tel cas, le tablier mobile se trouve soumis à un couple de basculement. Dans ces conditions, en raison de l'élasticité des différentes parties de la machine ainsi que de l'élasticité des moyens de guidage eux-mêmes, ces derniers se révèlent incapables de maintenir le parallélisme tant globalement qu'en ce qui concerne le parallélisme des bords en regard des deux tabliers, gage de la précision angulaire du pli sur toute sa longueur, sur lequel ces moyens de guidage n'ont pas d'effet. Le problème de l'équilibrage des presses soumises à un effort de travail excentré a été une préoccupation constante des constructeurs et utilisateurs, qu'il s'agisse de presses à plateaux d'usage général ou de presses plieuses comportant un tablier long et étroit où ce problème est particulièrement critique.The advantage of machines of this kind is that, during work, a parallel deformation of the edges facing the two decks occurs, thanks to the fact that the thrust force of the jacks on the movable lower deck is distributed uniformly along this movable deck in order to achieve constant and precise bending angles during work. This machine geometry is that of the machines described in French patent 1,362,471. In these machines, there are provided guide means intended to keep the movable deck parallel to the fixed upper deck, during its movements. In general, these guide means consist of rotary rollers carried by the movable apron and placed in contact with guide tracks provided on fixed elements of the frame. However, these mechanical guide means prove to be insufficient in the case where the result of the forces, due to the work carried out, is not located in the axis of the machine. Indeed in such a case, the movable deck is subjected to a tilting torque. Under these conditions, due to the elasticity of the different parts of the machine as well that of the elasticity of the guide means themselves, these prove to be incapable of maintaining parallelism both overall and as regards the parallelism of the edges facing the two decks, guaranteeing the angular precision of the fold over all of its length, over which these guide means have no effect. The problem of balancing presses subjected to an eccentric work effort has been a constant concern of manufacturers and users, whether they are presses with general use platens or press brakes comprising a long and narrow apron where this problem is particularly critical.
Le type de machine auquel s'applique l'invention suivant la présente demande est très particulier. En effet, il met en oeuvre une source de pression unique, une distribution unique pour la commande des mouvements et au moins trois vérins de travail dont un au moins disposé au centre.The type of machine to which the invention applies according to the present application is very specific. In fact, it uses a single pressure source, a single distribution for controlling the movements and at least three working jacks, at least one of which is placed in the center.
Les différents procédés d'équilibrage qui ont déjà été développés ne s'appliquent pas à ce type de machine et à cette configuration d'organes et ne permettent par ailleurs pas d'obtenir dans le cadre des machines les concernant tout à la fois le parallélisme global entre les deux tabliers et l'optimisation du parallélisme des faces en regard des tabliers inférieur et supérieur, ce que les machines objet du brevet FR 1.362.471 présentent sous condition que la charge soit centrée, c'est-à-dire le parallélisme prenant en compte les déformations géométriques des tabliers sous l'action des forces de travail.The various balancing methods which have already been developed do not apply to this type of machine and to this configuration of members and do not moreover allow parallelism to be obtained in the context of the machines relating to them. overall between the two decks and the optimization of the parallelism of the opposite faces of the lower and upper decks, which the machines object of patent FR 1,362,471 present on condition that the load is centered, that is to say the parallelism taking into account the geometric deformations of the decks under the action of the work forces.
Les techniques utilisées à ce jour ont habituellement trait à des presses à deux vérins supérieurs et mettent en jeu un organe de servo-distribution par vérin équipant la machine. Dans de telles dispositions, la pression s'établissant dans le vérin est uniquement fonction de la réaction du travail opposé au mouvement de ce vérin, le servo-distributeur commandant un volume d'huile alimentant le vérin.The techniques used to date usually relate to presses with two upper cylinders and involve a servo-distribution member per cylinder fitted to the machine. In such arrangements, the pressure built up in the cylinder is solely as a function of the reaction of the work opposed to the movement of this cylinder, the servo-distributor controlling a volume of oil supplying the cylinder.
Dans les dispositifs à deux vérins, compte tenu de la limitation même à deux vérins, la caractéristique fondamentale de déformée parallèle des faces en regard de tablier, même en conditions de charge centrée, n'est pas réalisable comme sur les presses suivant le brevet FR 1.362.471 qui décrit une technique nécessitant trois vérins. Seul le parallélisme global est assuré dans toutes les presses à deux vérins et deux servo-distributeurs.In devices with two cylinders, given the limitation even to two cylinders, the fundamental characteristic of parallel deformation of the faces opposite the deck, even under conditions of centered load, is not achievable as on presses according to the patent FR 1,362,471 which describes a technique requiring three cylinders. Only overall parallelism is ensured in all presses with two cylinders and two servo-distributors.
Lorsque la charge est excentrée, ces presses munies d'un dispositif à deux servo-distributeurs présentent l'inconvénient de ne pas toujours pouvoir maîtriser les déformations des faces en regard.When the load is offset, these presses provided with a device with two servo-distributors have the disadvantage of not always being able to control the deformations of the facing faces.
L'utilisation de dispositifs de commande de cette même nature, à servo-distribution, sur une presse à trois vérins, ne permettrait pas plus en conditions de charge excentrée de maîtriser le parallélisme de déformation des bords en regard. En effet, la pression s'établissant dans chaque vérin n'est que fonction de l'effort exercé par le travail en face de ce vérin et rien dans ces conditions ne permet d'agir de façon volontaire sur ces pressions et donc sur les déformations.The use of control devices of this same nature, with servo-distribution, on a press with three jacks, would not allow more under eccentric load conditions to control the parallelism of deformation of the facing edges. Indeed, the pressure being established in each cylinder is only a function of the force exerted by the work in front of this cylinder and nothing under these conditions allows to act voluntarily on these pressures and therefore on the deformations .
Le brevet US 2.343.167 offre une approche différente de la reprise des efforts excentrés. Ce brevet asservit le parallélisme global du plateau de travail, ou tablier mobile de travail, à la position d'un élément mobile de référence. Cet élément de référence n'étant soumis à aucun effort de travail, il fait complètement abstraction de la notion de déformées parallèles. Par ailleurs, le dispositif hydraulique d'équilibrage fait appel à un organe à étranglement variable préréglé par l'opérateur lors d'essais préalables, et il ne s'adapte donc pas automatiquement au besoin pour vaincre l'excentration. Outre le fait qu'un tel dispositif de limitation de pression est sans effet en statique, c'est-à-dire en phase de maintien de pression à la fin de la course de travail, phase essentielle pour la qualité de travail en formage, le préréglage est un réglage par tout ou rien commandé par des micro-interrupteurs. Ces dispositifs permettent uniquement d'éviter de façon grossière et non automatique les troubles majeurs associés à un effort de travail excentré mais en rien une correction fine et automatique comme cela est nécessaire sur une presse plieuse hydraulique.US Patent 2,343,167 offers a different approach to the recovery of eccentric forces. This patent enslaves the overall parallelism of the work platform, or mobile working apron, to the position of a mobile reference element. This reference element not being subjected to any work effort, it completely disregards the concept of parallel deformed shapes. In addition, the hydraulic balancing device uses a variable throttle member preset by the operator during preliminary tests, and therefore does not automatically adapt as needed to overcome eccentricity. Besides the fact that such a pressure limiting device has no effect in static, that is to say in the pressure maintenance phase at the end of the working stroke, an essential phase for the quality of work in forming, the preset is an all-or-nothing adjustment controlled by microswitches. These devices only make it possible to avoid, in a coarse and non-automatic manner, the major troubles associated with an eccentric work effort but in no way a fine and automatic correction as is necessary on a hydraulic press brake.
Le dispositif décrit dans le FR 2.545.418 a fondamentalement trait à la recherche de l'optimisation du parallélisme des faces en regard des tabliers et met bien en évidence l'importance de celle-ci. Le FR 2.545.418 met en oeuvre pour obtenir ce résultat des points d'appui additionnels d'un des tabliers portés par des traverses auxiliaires au même titre que le brevet français 2.347.992, et ajoute un ou plusieurs vérins supplémentaires de cambrage de l'autre tablier, portés eux-mêmes par des traverses auxiliaires.The device described in FR 2,545,418 basically relates to the search for the optimization of the parallelism of the faces opposite the aprons and clearly highlights the importance thereof. FR 2,545,418 implements to obtain this result additional support points of one of the decks carried by auxiliary crosspieces in the same way as French patent 2,347,992, and adds one or more additional camber cylinders of the 'other deck, carried themselves by auxiliary crosspieces.
Ces dispositifs entraînent une structure de machine complexe comprenant trois plaques d'acier pour constituer le tablier fixe, trois plaques d'acier pour constituer le tablier mobile, des points d'appui additionnels constitués par de lourdes broches d'acier et un ou plusieurs vérins additionnels. Cette technique est lourde, coûteuse et s'éloigne totalement de la géométrie des machines à tablier inférieur mobile telle que décrite dans par exemple le brevet FR 1.362.471.These devices drive a complex machine structure comprising three steel plates to constitute the fixed deck, three steel plates to constitute the movable deck, additional support points constituted by heavy steel pins and one or more jacks additional. This technique is cumbersome, expensive and totally departs from the geometry of machines with a movable lower deck as described in, for example, patent FR 1,362,471.
Dans l'état de la technique actuelle, il n'existe pas d'approche permettant tout à la fois d'assurer sur des machines à minimum trois vérins le parallélisme global des tabliers et l'optimisation du parallélisme des faces en regard, que la machine travaille en condition de charge centrée et/ou excentrée.In the current state of the art, there is no approach allowing both to ensure on machines with at least three jacks the overall parallelism of the decks and the optimization of the parallelism of the facing faces, that the machine works under load condition centered and / or offset.
La présente demande est relative à un circuit hydraulique permettant, tout en conservant cette configuration de base de ces machines de pliage, de conserver à celles-ci quelles que soient les conditions de travail centré ou excentré, le parallélisme global des tabliers inférieurs et supérieurs ainsi que l'optimalisation du parallélisme des faces en regard de ces tabliers.The present application relates to a hydraulic circuit making it possible, while retaining this basic configuration of these folding machines, to keep them whatever the working conditions centered or eccentric, the overall parallelism of the lower and upper decks as well that the optimization of the parallelism of the faces opposite these aprons.
Le but de l'invention est de maîtriser la force exercée par chacun des vérins agissant sur le tablier mobile pour assurer d'une part le parallélisme global et d'autre part, en agissant sur la force appliquée par chacun des vérins pour une même valeur de couple antagoniste, d'engendrer une courbe de déformation du tablier inférieur mobile, assurant ainsi une déformation parallèle optimale des deux tabliers.The object of the invention is to control the force exerted by each of the jacks acting on the movable bulkhead to ensure on the one hand the overall parallelism and on the other hand, by acting on the force applied by each of the jacks for the same value of opposing torque, to generate a deformation curve of the movable lower deck, thus ensuring optimal parallel deformation of the two decks.
L'invention a pour objet une presse plieuse pour la déformation des métaux en feuille, comportant un tablier supérieur fixe et un tablier inférieur mobile actionné par au moins trois vérins hydrauliques dont deux sont disposés aux extrémités latérales du tablier mobile et au moins un au centre selon l'axe de celui-ci, les vérins étant alimentés à partir d'un circuit hydraulique comportant une pompe entraînée par un moteur, un distributeur directionnel commandant les mouvements de montée et de descente du tablier mobile un dispositif de détection de la présence éventuelle d'un couple de basculement sur le tablier mobile, et un système comparateur et calculateur relié au dispositif de détection et comprenant des sorties de commande d'un système de régulation en fonction du basculement détecté, caractérisée en ce que tous les vérins sont reliés à un distributeur directionnel commun par l'intermédiaire de moyens de contrôle de pression commandés par le système comparateur et calculateur, celui-ci étant apte à commander une réduction en continu de la pression exercée sur le vérin situé du côté opposé à la direction du couple de basculement, et éventuellement aussi sur le vérin situé au centre, de façon à créer un couple antagoniste en fonction des données reçues du dispositif de détection, ce couple antagoniste étant capable d'une part de contre-balancer de manière continue et proportionnelle le couple de basculement garantissant ainsi le parallélisme global et d'autre part d'assurer le maintien en parallèle des zones de travail des bords opposés des tabliers qui se déforment lors de l'opération.The invention relates to a press brake for the deformation of sheet metals, comprising a fixed upper deck and a movable lower deck actuated by at least three hydraulic cylinders, two of which are arranged at the lateral ends of the movable deck and at least one in the center. along the axis thereof, the cylinders being supplied from a hydraulic circuit comprising a pump driven by a motor, a directional distributor controlling the movements of raising and lowering of the movable platform, a device for detecting the possible presence of a tilting torque on the movable deck, and a comparator and computer system connected to the detection device and comprising control outputs of a regulation system according to the detected tilting, characterized in that all the jacks are connected to a common directional distributor by means of pressure control means controlled by the sy stema comparator and calculator, the latter being capable of controlling a continuous reduction of the pressure exerted on the jack situated on the side opposite to the direction of the tilting torque, and possibly also on the jack situated in the center, so as to create a torque antagonistic as a function of the data received from the detection device, this antagonistic couple being capable on the one hand of counterbalancing in a continuous and proportional manner the tilting torque thus guaranteeing the overall parallelism and on the other hand ensuring the maintenance in parallel work areas on the opposite edges of the aprons which become deformed during the operation.
Les moyens prévus pour assurer un contrôle de pression sur un ou plusieurs des vérins, actionnant le tablier inférieur mobile, peuvent donner lieu à des formes de réalisation différentes. De même le dispositif de détection du basculement éventuel du tablier mobile ainsi que le dispositif comparateur et calculateur peuvent faire l'objet de diverses formes de réalisation.The means provided for ensuring pressure control on one or more of the jacks, actuating the movable lower bulkhead, can give rise to different embodiments. Likewise, the device for detecting any tilting of the movable apron as well as the comparator and calculator device can be the subject of various embodiments.
Ainsi, l'invention présente d'autres caractéristiques selon lesquelles:
- - le calculateur et comparateur comporte en outre une entrée permettant l'introduction de données supplémentaires définissant des variations dans les conditions générales de travail, le couple antagoniste étant fonction d'une synthèse des données reçues du dispositif de détection et de celles introduites par l'entrée,
- - les moyens de réduction de pression comportent autant de réducteurs proportionnels de pression qu'il y a de vérins actionnant le tablier inférieur mobile, et chaque réducteur est associé à un seul vérin,
- - les moyens de contrôle de pression comportent un seul réducteur proportionnel de pression inséré dans le circuit hydraulique de commande et relié à chaque vérin hydraulique par l'intermédiaire d'une valve de liaison respective permettant d'appliquer au vérin correspondant, soit la pression normale du circuit de commande, soit une pression réduite, le système comparateur étant en outre apte à agir sur l'une ou l'autre de ces valves, ou plusieurs d'entre elles, suivant le cas.
- - the calculator and comparator further includes an input allowing the introduction of additional data defining variations in the general working conditions, the opposing torque being a function of a synthesis of the data received from the detection device and those entered by the Entrance,
- the pressure reduction means include as many proportional pressure reducers as there are cylinders actuating the movable lower bulkhead, and each reducer is associated with a single cylinder,
- - the pressure control means comprise a single proportional pressure reducer inserted in the hydraulic control circuit and connected to each cylinder hydraulic by means of a respective connection valve making it possible to apply to the corresponding jack either the normal pressure of the control circuit or a reduced pressure, the comparator system being further able to act on one or the another of these valves, or more of them, as the case may be.
Certaines de ces formes de réalisation sont décrites ci-dessous à simple titre d'exemple, en référence aux dessins annexés sur lesquels:
- La figure 1 est une vue schématique en élévation de face d'une presse plieuse selon l'invention.
- La figure 2 en est une vue en élévation en bout.
- Les figures 3 et 4 représentent deux formes différentes de réalisation du circuit hydraulique de commande de la presse plieuse selon l'invention.
- La figure 5 est un schéma du circuit de commande des réducteurs de pression prévus dans le circuit hydraulique, dans le cas où la détection du basculement est réalisée par la mesure des courses des deux extrémités du tablier inférieur, puis par le calcul de la différence qui représente le basculement.
- Figure 1 is a schematic front elevational view of a press brake according to the invention.
- Figure 2 is an end elevational view.
- Figures 3 and 4 show two different embodiments of the hydraulic circuit for controlling the press brake according to the invention.
- FIG. 5 is a diagram of the control circuit for the pressure reducers provided in the hydraulic circuit, in the case where the tilting detection is carried out by measuring the strokes of the two ends of the lower deck, then by calculating the difference which represents tilting.
La presse plieuse représentée aux figures 1 et 2 est du type comportant un tablier supérieur fixe 1 et un tablier inférieur mobile 2. Le tablier supérieur est porté par un bâti comportant deux flasques transversaux 3. Quant au tablier inférieur 2, il est monté entre deux traverses de reprise de force constituées par des panneaux verticaux 4 faisant partie du bâti.The press brake shown in Figures 1 and 2 is of the type comprising a fixed
Dans l'exemple représenté, ce tablier 2 est actionné par trois vérins hydrauliques à simple effet disposés symétriquement par rapport à l'axe vertical médian X-Y de la machine. Deux de ces vérins 5a et 5b sont disposés près de l'un et l'autre côtés extrêmes du tablier 2. Quant au troisième vérin 5c, il est placé au centre selon l'axe X-Y. Ces vérins prennent appui sur les panneaux verticaux 4 du bâti de la machine et ils sont destinés à assurer les déplacements verticaux du tablier 2 et à appliquer sur celui-ci la force voulue de travail de bas en haut, lors du pliage d'une tôle 7 entre deux outils adaptés sur cette presse, en l'occurrence un poinçon 8 porté par le tablier supérieur fixe 1 et une matrice 9 portée par le tablier inférieur mobile 2.In the example shown, this
Ce dernier tablier est guidé par quatre paires de galets 10 montés librement rotatifs sur lui et qui sont placés au contact de pistes verticales de guidage prévues respectivement sur une entretoise fixe 11 solidaire des traverses 4 du bâti, et sur le corps fixe du vérin central 5c.This last deck is guided by four pairs of
Les trois vérins 5a, 5b, 5c sont alimentés à partir d'un distributeur directionnel 12 comme on peut le constater en se reportant au schéma du circuit hydraulique de commande, qui est représenté à la figure 3. Ce circuit comprend par ailleurs une pompe 13 entraînée par un moteur 14. Le déplacement du tiroir du distributeur 12 dans un sens ou dans l'autre permet d'assurer le déplacement du tablier inférieur 2 vers le haut ou vers le bas, ce dernier déplacement étant effectué sous l'action du poids du tablier.The three
Conformément à l'une des caractéristiques de l'invention, le présent circuit hydraulique comprend en outre des moyens de contrôle de pression sous forme de réducteurs de pression proportionnels 15a, 15b et 15c en nombre égal aux vérins de travail du tablier mobile. Chacun de ces réducteurs de pression est associé à l'un de ces vérins, comme représenté sur le schéma de la figure 3. En conséquence en agissant sur l'un et/ou l'autre de ces réducteurs, il est possible de réduire de manière continue la pression de commande du ou des vérins correspondants.In accordance with one of the characteristics of the invention, the present hydraulic circuit further comprises pressure control means in the form of
Il est par ailleurs prévu un dispositif de détection permettant de détecter le basculement éventuel du tablier inférieur mobile 2 lors de l'utilisation de la présente presse. Cependant, ce dispositif est conçu pour pouvoir détecter à la fois l'apparition d'un tel basculement et le sens de celui-ci.A detection device is also provided for detecting any tilting of the movable
Dans l'exemple représenté aux figures 1 et 2, le dispositif de détection ainsi prévu est constitué par deux capteurs linéaires de déplacement, prévus à l'une et l'autre extrémités du tablier inférieur 2. Ces capteurs, désignés par les références générales 16a et 16b, peuvent être des capteurs digitaux à lecture optique, ou des capteurs analogiques à effet inductif, potentiométrique ou autre.In the example shown in FIGS. 1 and 2, the detection device thus provided is constituted by two linear displacement sensors, provided at one and the other end of the
Dans l'exemple illustré à la figure 5, chacun de ces capteurs comporte un index mobile 22 porté par le tablier 2 et qui se déplace en regard d'une réglette verticale fixe 23 solidaire de l'une des traverses 4 du bâti, ou vice versa. Ainsi chacun de ces capteurs est susceptible de mesurer la course de déplacement de l'extrémité correspondante du tablier mobile 2.In the example illustrated in Figure 5, each of these sensors has a
Chacun de ces deux capteurs est apte à émettre un signal électrique qui est fonction de l'importance du déplacement mesuré. Or ces deux capteurs sont branchés dans un circuit électronique comportant un système comparateur et calculateur 24 auquel ils sont reliés (voir figure 5) et qui comporte des sorties de puissance A, B et C raccordées aux organes de commande des réducteurs 15a, 15b, 15c.Each of these two sensors is capable of emitting an electrical signal which is a function of the extent of the displacement measured. However, these two sensors are connected to an electronic circuit comprising a comparator and computer system 24 to which they are connected (see FIG. 5) and which comprises power outputs A, B and C connected to the control members of the
Le comparateur/calculateur est apte à déterminer s'il y a identité de déplacement ou si au contraire il existe une différence correspondant à un basculement du tablier inférieur 2. Ce comparateur est alors en mesure de déterminer à la fois l'importance du couple de basculement, et le sens de celui-ci.The comparator / calculator is able to determine if there is displacement identity or if on the contrary there is a difference corresponding to a tilting of the
En outre, le comparateur et calculateur 24 possède une entrée E par laquelle sont introduites les données définissant les conditions générales de travail. Cette instruction peut être effectuée lors de la programmation si la saisie des informations est entièrement manuelle comme c'est généralement le cas sur une commande numérique, et/ou au début de l'opération de travail si la saisie des informations est obtenue par un système de palpeur, micro-interrupteurs ou toute autre forme de détecteurs de présence de la tôle ou de zones d'efforts tels que jauges de contraintes.In addition, the comparator and computer 24 has an input E through which the data are entered. defining the general working conditions. This instruction can be carried out during programming if the entry of information is entirely manual as is generally the case on a numerical control, and / or at the start of the work operation if the entry of information is obtained by a system. probe, microswitches or any other form of sheet metal presence detectors or force zones such as strain gauges.
Les conditions de travail se différencient par la position nominale de la tôle, c'est-à-dire celle qui ne prend pas en compte les erreurs de positionnement, par sa longueur, son épaisseur et le type d'outillage utilisé. Il est à considérer que ces informations font partie de celles communiquées habituellement à la commande numérique de la presse plieuse lorsqu'elle en est équipée; dans ce cas un seul transfert d'informations a lieu par l'entrée E à partir de la commande numérique. Le pliage peut être normal, centré avec simple possibilité d'excentration accidentelle, il peut être partiellement excentré ou comporter des opérations de natures différentes: pliage, poinçonnage ou frappe pouvant être exécutés sur des unités d'outillages dont certaines fortement excentrées.The working conditions are differentiated by the nominal position of the sheet, that is to say that which does not take into account positioning errors, by its length, its thickness and the type of tool used. It should be considered that this information is part of that usually communicated to the digital control of the press brake when fitted; in this case, only one transfer of information takes place via input E from the digital control. The folding can be normal, centered with the simple possibility of accidental off-centering, it can be partially off-center or include operations of different natures: folding, punching or striking which can be carried out on tool units, some of which are strongly off-center.
Les déformations des tabliers sont essentiellement fonction de la nature de ces conditions de travail. C'est pourquoi le comparateur et calculateur doit tenir compte des informations fournies à l'entrée E, en plus de celles reçues des capteurs 16a et 16b pour calculer la grandeur des signaux fournis aux sorties A, B, C et transmis aux réducteurs 15a, 15b, 15c, respectivement au réducteur 15 et aux valves de liaison 21a, 21b, 21c suivant un mode de réalisation décrit en référence à la figure 4.The deformations of the aprons are essentially a function of the nature of these working conditions. This is why the comparator and computer must take account of the information supplied at the input E, in addition to that received from the
Ces ordres peuvent être en particulier soit l'alimentation dosée de la sortie A seule ou l'alimentation différenciée des sorties A et C pour le basculement dans un sens, soit l'alimentation dosée de la sortie B seule, ou l'alimentation différenciée des sorties B et C pour le basculement dans l'autre sens.These orders can be in particular either the metered supply of output A alone or the differentiated supply of outputs A and C for the tilting in one direction, either the metered supply of output B alone, or the differentiated supply of outputs B and C for tilting in the other direction.
Cette alimentation intervient sur une ou deux sorties suivant l'importance et la nature de la correction déterminée par le comparateur/calculateur. Deux des réducteurs 15a, 15b, 15c ainsi alimentés provoquent une répartition des pressions dans les vérins telle qu'il se forme un couple antagoniste au couple de basculement du tablier 2 assurant le parallélisme global ainsi qu'une déformation de ce tablier apte à optimiser le parallélisme des faces en regard de ce tablier 2 et du tablier fixe 1.This supply intervenes on one or two outputs depending on the importance and the nature of the correction determined by the comparator / calculator. Two of the
Comme déjà indiqué, la figure 4 représente une autre forme de réalisation du circuit hydraulique de commande de la présente presse plieuse. Cette forme de réalisation se différencie de la précédente par le fait qu'il n'est prévu qu'un seul réducteur de pression désigné par la référence générale 15.As already indicated, FIG. 4 shows another embodiment of the hydraulic control circuit of this press brake. This embodiment differs from the previous one in that only one pressure reducer is designated, designated by the
Cependant le circuit hydraulique de commande des trois vérins 5a, 5b et 5c est agencé de manière qu'il soit possible d'appliquer à chaque vérin, soit la pression normale provenant de la pompe 13, soit une pression réduite dont la valeur est déterminée par le réducteur unique 15. A cet effet, il est prévu trois valves de liaison 21a, 21b et 21c dont chacune est associée à l'un des vérins et permet d'appliquer à celui-ci soit la pression normale soit la pression réduite déterminée par le réducteur 15.However, the hydraulic circuit for controlling the three
Or, ces trois valves de liaison 21a, 21b et 21c sont raccordées, comme le réducteur de pression (15), au comparateur-calculateur. Ainsi, en cas d'apparition d'un couple de basculement, ce comparateur-calculateur alimente simultanément le réducteur de pression (15) et deux des valves 21a, 21b, 21c, pour provoquer une réduction de pression sur le vérin central et le vérin de travail situé du côté opposé à celui où s'exerce le travail excentré. Ceci permet de créer un couple antagoniste contrebalançant le couple de basculement et rétablissant le parallélisme global.However, these three
Par ailleurs, le dispositif de détection de l'apparition d'un couple de basculement sur le tablier inférieur mobile pourrait être réalisé différemment de ce qui est prévu dans le cas des deux exemples décrits ci-dessus où il est effectué une surveillance d'une différence de déplacement de l'une des extrémités du tablier mobile par rapport à l'autre. En effet, il serait possible d'utiliser un système de détection comprenant plusieurs jauges de contrainte convenablement disposées pour détecter des différences d'efforts s'exerçant sur l'une et l'autre parties du tablier mobile. Les jauges de contrainte ainsi prévues seraient alors branchées dans un circuit comparateur/calculateur permettant de déterminer à la fois l'apparition d'une différence entre les efforts exercés et le sens de cette différence.Furthermore, the device for detecting the appearance of a tilting torque on the movable lower bulkhead could be produced differently from what is provided in the case of the two examples described above where monitoring of a difference in displacement of one end of the movable deck relative to the other. Indeed, it would be possible to use a detection system comprising several strain gauges suitably arranged to detect differences in forces exerted on one and the other parts of the movable deck. The strain gauges thus provided would then be connected to a comparator / calculator circuit making it possible to determine both the appearance of a difference between the forces exerted and the direction of this difference.
Quant aux moyens réducteurs de pression, ils pourraient également être réalisés de façon différente pour autant que ceux-ci permettent de réaliser une réduction de pression, non pas de façon globale pour la totalité des vérins de travail du tablier inférieur mobile, mais pour chacun de ces vérins pris isolément ou plusieurs d'entre eux.As for the pressure reducing means, they could also be produced in a different way provided that these make it possible to achieve a pressure reduction, not globally for all of the working cylinders of the movable lower bulkhead, but for each of these jacks taken alone or more of them.
La présente invention permet ainsi de conserver la structure des machines comportant une source de pression unique, une distribution unique pour la commande des mouvements, et au moins trois vérins de travail dont un au moins disposé au centre, ceci dans les conditions générales de réalisation mécanique de ces machines tout en autorisant le travail centré ou excentré dans des conditions conservant le parallélisme global et l'optimisation du parallélisme des faces en regard des tabliers supérieurs et inférieurs.The present invention thus makes it possible to preserve the structure of the machines comprising a single pressure source, a single distribution for controlling the movements, and at least three working jacks, one of which at least disposed in the center, this under the general conditions of mechanical production. of these machines while allowing centered or eccentric work under conditions that maintain overall parallelism and the optimization of parallelism of the faces opposite the upper and lower decks.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT90403636T ATE96375T1 (en) | 1989-12-19 | 1990-12-18 | HYDRAULIC BENDING PRESS WITH MOVABLE BEAM. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8916778A FR2655907B1 (en) | 1989-12-19 | 1989-12-19 | HYDRAULIC BENDING PRESS WITH MOBILE LOWER APRON. |
| FR8916778 | 1989-12-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0434541A1 true EP0434541A1 (en) | 1991-06-26 |
| EP0434541B1 EP0434541B1 (en) | 1993-10-27 |
Family
ID=9388669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90403636A Expired - Lifetime EP0434541B1 (en) | 1989-12-19 | 1990-12-18 | Hydraulic bending press with movable lower beam |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US5243902A (en) |
| EP (1) | EP0434541B1 (en) |
| JP (1) | JP2505337B2 (en) |
| KR (1) | KR100211550B1 (en) |
| AT (1) | ATE96375T1 (en) |
| BR (1) | BR9007127A (en) |
| CA (1) | CA2046914A1 (en) |
| DE (1) | DE69004234T2 (en) |
| DK (1) | DK0434541T3 (en) |
| ES (1) | ES2046748T3 (en) |
| FI (1) | FI95111C (en) |
| FR (1) | FR2655907B1 (en) |
| PT (1) | PT96282B (en) |
| WO (1) | WO1991008894A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2705052A1 (en) * | 1993-05-10 | 1994-11-18 | Treillet Jean | Balancing system for press brake with 3 or more cylinders. |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2727954B2 (en) * | 1994-03-03 | 1998-03-18 | トヨタ自動車株式会社 | Press equipment |
| JP2812201B2 (en) * | 1994-07-15 | 1998-10-22 | トヨタ自動車株式会社 | Press equipment |
| JP3060908B2 (en) * | 1994-12-21 | 2000-07-10 | トヨタ自動車株式会社 | Press machine equalizer |
| US6246922B1 (en) | 1998-04-17 | 2001-06-12 | Hydro-Cam Engineering Company | Automatic computer controlled programmable multi-purpose apparatus to produce variable design stampings |
| US6250216B1 (en) | 1999-03-19 | 2001-06-26 | The Minster Machine Company | Press deflection controller and method of controlling press deflection |
| DE60022074T2 (en) * | 1999-10-20 | 2006-02-02 | Amada Co., Ltd., Isehara | BANK PRESS AND MOVEMENT PROCEDURE OF THE PISTON OF A PUSHING PRESS |
| JP3689010B2 (en) | 2001-03-15 | 2005-08-31 | 株式会社放電精密加工研究所 | Press machine |
| JP4343574B2 (en) * | 2003-04-15 | 2009-10-14 | 株式会社放電精密加工研究所 | Press molding machine |
| DE10340794B4 (en) * | 2003-09-02 | 2012-08-16 | Ise Automotive Gmbh | Follower tool for producing a complex shaped and provided with openings in different planes component |
| WO2006017638A2 (en) * | 2004-08-04 | 2006-02-16 | The Coe Manufacturing Company | Platen press |
| DE102012100325C5 (en) * | 2012-01-16 | 2019-06-19 | Schuler Pressen Gmbh | Use of force flow data in a press for the operation of a ram |
| DE102012108933B4 (en) * | 2012-09-21 | 2019-08-08 | Schuler Pressen Gmbh | Method for operating a machine tool or work machine and then executed machine tool or work machine with a connection arrangement for a lifting element |
| IT201800020791A1 (en) * | 2018-12-21 | 2020-06-21 | Bystronic Laser Ag | PANEL BENDING MACHINE WITH A SYSTEM FOR MAINTAINING THE PARALLELISM OF THE MOVABLE MEMBERS AND A RESPECTIVE METHOD |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2343167A (en) * | 1941-06-21 | 1944-02-29 | Hydraulic Dev Corp Inc | Press leveling means |
| FR1108366A (en) * | 1954-07-02 | 1956-01-12 | Servomecanismes Electroniques | Improvements to actuator control systems |
| FR1497961A (en) * | 1966-10-27 | 1967-10-13 | Schweizerische Lokomotiv | Method for imposing synchronous operation on hydraulically driven working pistons |
| US3469435A (en) * | 1966-08-08 | 1969-09-30 | Niagara Machine & Tool Works | Level control for hydraulic press brakes and the like |
| DE2849578A1 (en) * | 1978-11-15 | 1980-05-29 | Handels Und Service Gmbh Masch | Control for two cylinder press drive - uses travel of one piston to set required position with error signal passed to control |
| EP0231735A1 (en) * | 1985-12-30 | 1987-08-12 | HOERBIGER HYDRAULIK GmbH | Synchronization device for a hydraulic multiple cylinder drive |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3129625A (en) * | 1963-01-07 | 1964-04-21 | Niagara Machine & Tool Works | Level and slope control for reciprocating machines |
| FR1362471A (en) * | 1963-02-28 | 1964-06-05 | Promecam Ets | Improvements to press brakes |
| FR1539817A (en) * | 1967-07-26 | 1968-09-20 | Promecam Sisson Lehmann Soc | Hydraulic machine for deformation of metal sheets |
| JPS518232B1 (en) * | 1969-09-12 | 1976-03-15 | ||
| US4148203A (en) * | 1977-10-07 | 1979-04-10 | Dreis & Krump Mfg. Co. | Computer-controlled press brake |
| GB2076324B (en) * | 1980-05-26 | 1985-06-19 | Amada Co Ltd | Hydraulic presses |
| JPS5922109A (en) * | 1982-07-29 | 1984-02-04 | Uchida Yuatsu Kiki Kogyo Kk | Synchronous controlling method of three cylinders |
| US4608852A (en) * | 1983-08-24 | 1986-09-02 | Amada Company, Limited | Press machine |
| US4784058A (en) * | 1986-08-13 | 1988-11-15 | Kabushiki Kaisha Kobe Seiko Sho | Press control for maintaining a level position and a uniform pressure on a workpiece |
| US4819467A (en) * | 1986-09-17 | 1989-04-11 | Cincinnati Incorporated | Adaptive control system for hydraulic press brake |
| CA1275892C (en) * | 1986-10-10 | 1990-11-06 | Ronald Ballantyne | Hydraulic cylinder device for platen spacing indication and control |
| US4923383A (en) * | 1987-12-26 | 1990-05-08 | Kabushiki Kaisha Kobe Seiko Sho | Apparatus for mold aligning in a compression molding machine |
-
1989
- 1989-12-19 FR FR8916778A patent/FR2655907B1/en not_active Expired - Fee Related
-
1990
- 1990-12-18 AT AT90403636T patent/ATE96375T1/en not_active IP Right Cessation
- 1990-12-18 WO PCT/FR1990/000918 patent/WO1991008894A1/en active IP Right Grant
- 1990-12-18 ES ES199090403636T patent/ES2046748T3/en not_active Expired - Lifetime
- 1990-12-18 DE DE90403636T patent/DE69004234T2/en not_active Expired - Fee Related
- 1990-12-18 US US07/752,506 patent/US5243902A/en not_active Expired - Fee Related
- 1990-12-18 EP EP90403636A patent/EP0434541B1/en not_active Expired - Lifetime
- 1990-12-18 CA CA002046914A patent/CA2046914A1/en not_active Abandoned
- 1990-12-18 KR KR1019910700924A patent/KR100211550B1/en not_active IP Right Cessation
- 1990-12-18 DK DK90403636.5T patent/DK0434541T3/en active
- 1990-12-18 BR BR909007127A patent/BR9007127A/en not_active IP Right Cessation
- 1990-12-18 JP JP3501847A patent/JP2505337B2/en not_active Expired - Fee Related
- 1990-12-19 PT PT96282A patent/PT96282B/en not_active IP Right Cessation
-
1991
- 1991-08-16 FI FI913879A patent/FI95111C/en not_active IP Right Cessation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2343167A (en) * | 1941-06-21 | 1944-02-29 | Hydraulic Dev Corp Inc | Press leveling means |
| FR1108366A (en) * | 1954-07-02 | 1956-01-12 | Servomecanismes Electroniques | Improvements to actuator control systems |
| US3469435A (en) * | 1966-08-08 | 1969-09-30 | Niagara Machine & Tool Works | Level control for hydraulic press brakes and the like |
| FR1497961A (en) * | 1966-10-27 | 1967-10-13 | Schweizerische Lokomotiv | Method for imposing synchronous operation on hydraulically driven working pistons |
| DE2849578A1 (en) * | 1978-11-15 | 1980-05-29 | Handels Und Service Gmbh Masch | Control for two cylinder press drive - uses travel of one piston to set required position with error signal passed to control |
| EP0231735A1 (en) * | 1985-12-30 | 1987-08-12 | HOERBIGER HYDRAULIK GmbH | Synchronization device for a hydraulic multiple cylinder drive |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2705052A1 (en) * | 1993-05-10 | 1994-11-18 | Treillet Jean | Balancing system for press brake with 3 or more cylinders. |
| WO1994026510A1 (en) * | 1993-05-10 | 1994-11-24 | Jean Treillet | Balancing system for a bending press |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04505890A (en) | 1992-10-15 |
| DK0434541T3 (en) | 1994-02-21 |
| ES2046748T3 (en) | 1994-02-01 |
| DE69004234D1 (en) | 1993-12-02 |
| FR2655907A1 (en) | 1991-06-21 |
| FI95111B (en) | 1995-09-15 |
| US5243902A (en) | 1993-09-14 |
| PT96282A (en) | 1992-09-30 |
| ATE96375T1 (en) | 1993-11-15 |
| EP0434541B1 (en) | 1993-10-27 |
| DE69004234T2 (en) | 1994-05-05 |
| KR100211550B1 (en) | 1999-08-02 |
| KR920700897A (en) | 1992-08-10 |
| PT96282B (en) | 1998-07-31 |
| JP2505337B2 (en) | 1996-06-05 |
| WO1991008894A1 (en) | 1991-06-27 |
| BR9007127A (en) | 1991-11-26 |
| FR2655907B1 (en) | 1993-07-30 |
| FI913879A0 (en) | 1991-08-16 |
| CA2046914A1 (en) | 1991-06-20 |
| FI95111C (en) | 1995-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0434541B1 (en) | Hydraulic bending press with movable lower beam | |
| EP0283342B1 (en) | Rolling mill having axially shifting rolls, and roll profile control method | |
| FR2459130A1 (en) | INSTALLATION FOR DETERMINING THE HEIGHT OF MOLDED OBJECTS ON A PRESS AND IN PARTICULAR MOLDED OBJECTS FROM A POWDERY MATERIAL | |
| EP0155228A1 (en) | Plate bending machine with a device for controlling the bending angle | |
| EP1673181B1 (en) | Method of increasing the control precision of the path of a product in a levelling machine with interlocking rollers, and levelling installation used to implement same | |
| EP0365447B1 (en) | Method and apparatus for compressing and controlling the compression of powdery materials, and press using such a method and apparatus | |
| EP0227870A1 (en) | Automatically controlled machine for rolling metal sheets | |
| FR2561560A1 (en) | DEVICE FOR ADVANCING AND / OR DRIVING OF THE SLIDE TYPE | |
| FR2502990A1 (en) | MULTI-LEVEL ROLLER WITH MECHANISM FOR ADJUSTING THE FLATTENING OF THE ROLLED PRODUCT | |
| FR2641211A1 (en) | BENDING MACHINE AND METHOD FOR BENDING SHEET-LIKE PIECES | |
| WO2002074463A1 (en) | Method for setting the travel of a press brake | |
| EP1112130A1 (en) | Press brake with active lower table | |
| EP0286533B1 (en) | Metal strip or sheet-rolling method and installation | |
| EP0238377B1 (en) | Roll bending control in a rolling mill with axially shiftable rolls | |
| FR2527968A1 (en) | Supple grip for robot arm - uses two pincers faced with elastically deformable block and has magneto-resistive transducer to measure deformation | |
| FR2459131A1 (en) | HIGH PRESSURE COMPACTING DEVICE COMPRISING A PRESS CHASSIS WITH TIGHTS AND COMPRESSION COMPONENTS | |
| FR2570020A1 (en) | AUTOMATIC PRESS | |
| WO1997046337A1 (en) | Improvement to the blank holder force regulating system in a press | |
| FR2708219A1 (en) | Method for compensating for the deformations of slides (aprons) of hydraulic presses, slides and hydraulic presses thus equipped | |
| EP0975447B1 (en) | Rolling installation for flat products | |
| FR2531778A1 (en) | Device for measuring frictional and wearing forces, having an alternating linear motion allowing high loads and large contact areas | |
| FR2786415A1 (en) | ROLLER EQUIPPED WITH WORKING CYLINDER BENDING MEANS | |
| EP0423029B1 (en) | Device and method for lifting and moving objects | |
| CA1279213C (en) | Profile setting device for conformable wall cylinder | |
| EP0443968A1 (en) | Manually actuated device for motorised displacements of a machine member |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IT LI NL SE |
|
| RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: AMADA S.A. |
|
| 17P | Request for examination filed |
Effective date: 19910805 |
|
| 17Q | First examination report despatched |
Effective date: 19921006 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB IT LI NL SE |
|
| REF | Corresponds to: |
Ref document number: 96375 Country of ref document: AT Date of ref document: 19931115 Kind code of ref document: T |
|
| REF | Corresponds to: |
Ref document number: 69004234 Country of ref document: DE Date of ref document: 19931202 |
|
| ITF | It: translation for a ep patent filed |
Owner name: CALVANI SALVI E VERONEL |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19931230 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2046748 Country of ref document: ES Kind code of ref document: T3 |
|
| REG | Reference to a national code |
Ref country code: DK Ref legal event code: T3 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| EAL | Se: european patent in force in sweden |
Ref document number: 90403636.5 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20001117 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20001120 Year of fee payment: 11 Ref country code: DK Payment date: 20001120 Year of fee payment: 11 Ref country code: AT Payment date: 20001120 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20001212 Year of fee payment: 11 Ref country code: CH Payment date: 20001212 Year of fee payment: 11 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20011218 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20011218 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20011219 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20011231 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20011231 |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020701 |
|
| EUG | Se: european patent has lapsed |
Ref document number: 90403636.5 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20020701 |
|
| REG | Reference to a national code |
Ref country code: DK Ref legal event code: EBP |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20021219 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20030113 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20041206 Year of fee payment: 15 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20041207 Year of fee payment: 15 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20041224 Year of fee payment: 15 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20050113 Year of fee payment: 15 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20051218 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20051218 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20051231 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060701 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20051218 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060831 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20060831 |
|
| BERE | Be: lapsed |
Owner name: S.A. *AMADA Effective date: 20051231 |