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EP1112130A1 - Press brake with active lower table - Google Patents

Press brake with active lower table

Info

Publication number
EP1112130A1
EP1112130A1 EP99941714A EP99941714A EP1112130A1 EP 1112130 A1 EP1112130 A1 EP 1112130A1 EP 99941714 A EP99941714 A EP 99941714A EP 99941714 A EP99941714 A EP 99941714A EP 1112130 A1 EP1112130 A1 EP 1112130A1
Authority
EP
European Patent Office
Prior art keywords
deck
curvature
press brake
wall
slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99941714A
Other languages
German (de)
French (fr)
Other versions
EP1112130B1 (en
Inventor
Claude Gascoin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amada Europe SA
Original Assignee
Amada Europe SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Amada Europe SA filed Critical Amada Europe SA
Publication of EP1112130A1 publication Critical patent/EP1112130A1/en
Application granted granted Critical
Publication of EP1112130B1 publication Critical patent/EP1112130B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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

Definitions

  • the present invention relates to a press brake for folding metal sheets of the type comprising an upper deck arranged above a lower deck, the latter being fixed in abutment at its ends while the upper deck is movable and actuated in a plane vertical by drive members also located at its two ends.
  • the drive members provide the force necessary to bend the metal sheets or sheets and these cause the deformation of the two decks in the opposite direction.
  • the longitudinal deformation curves of the decks are substantially symmetrical with respect to the plane of separation of the decks so that the maximum distance between the decks is located near the middle of the thrust points (drive members and fixed supports) and represents twice the maximum deformation of each deck.
  • the maximum difference between the upper and lower aprons is an essential parameter of the precision and quality of the fold produced and in the case mentioned above, the two aprons being more apart in the middle than at the ends, the fold will be more open to the center only at said ends.
  • Japanese utility model 2 558 928 which describes a press brake comprising a movable upper deck and a fixed lower deck formed by a plate of uniform thickness in which two symmetrically identical slots are made. relative to the median transverse plane of said lower deck.
  • Each slot has an upper wall and a lower wall connected by a bottom as well as an opening situated at the level of the corresponding lateral edges of the plate.
  • the plate thus comprises a lower part and an upper part situated respectively below and above the slots.
  • the lower part of the plate is fixed to two flanges which also support the upper deck, while the upper part of the plate or more exactly its ends are free to move in a vertical plane.
  • This Japanese utility model also indicates that the slots are each provided with a movable member whose position is adjustable manually or automatically, inside the slots.
  • This movable member is directly in contact with the lower and upper walls of each slot and its movement makes it possible to virtually limit the depth of said slots and therefore to decrease as the movable member approaches the openings, the elasticity of the lower apron.
  • the use of this type of press brake does not, unfortunately, allow perfect control of the parallelism of the deformation curvatures of the edges opposite the lower and upper decks.
  • the pressure exerted on the free upper part of the lower deck is only a function of the force applied by the work of the drive members on the upper deck and therefore consequently by the sheet to be bent and nothing under these conditions makes it possible to act voluntarily on these pressures and therefore on the deformations of said upper part of the lower deck so that these are perfectly parallel to the deformations of the upper deck.
  • the movable member when the movable member is located substantially at the bottom of the slot and the force applied by the work of the members is significant, the deformation curvature of the lower deck is then maximum and in this case the intrinsic elasticity of the upper part of the lower deck can be irreparably damaged.
  • the object of the present invention is to overcome the above-mentioned technical problems in a satisfactory manner.
  • a press brake for folding metal sheets of the type comprising an upper apron disposed above a lower apron, the lower apron being fixed in abutment at its ends while apron upper is movable and actuated in a vertical plane by drive members also located at its ends, the lower deck being constituted by a plate comprising a free upper part and a fixed lower part delimited by two slots symmetrically identical with respect to the transverse plane median of said lower apron, each slot comprising an upper wall and a lower wall connected by a bottom as well as an opening situated at the level of the corresponding lateral edges of the plate, characterized in that each slot is equipped with a displacement member connecting the free upper part and the fixed lower part of the lower apron to bring the upper wall of the slot closer to its lower wall, whereby the deformation curvature of the free upper part of said lower apron is modified.
  • each displacement member comprises on the one hand a fixed part connected to the lower wall of the slot and on the other hand a movable part secured to the upper wall of the slot.
  • each displacement member is located at the opening of the slots, so as to allow precise movement of the free ends of the upper walls of said slots.
  • the press brake comprises a control assembly for independently controlling each displacement member as a function of the curvature which it is desired to give at each end of the free upper part of the lower deck.
  • control assembly comprises:
  • control assembly further comprises measurement means to obtain information on the effective curvature of the free upper part of the lower deck and the programmed curvature.
  • the displacement member according to the invention makes it possible to control and securely adjust the curvature of deformation of the free upper part of the lower deck and this without risk of exceeding the elastic limit of said lower deck.
  • FIG. 1 represents a schematic view of a press brake according to the invention with displacement members
  • FIG. 2 represents a view in vertical section along the line II— II of FIG. 1, and
  • FIG. 3 shows a schematic view of a control assembly for controlling the movement members.
  • FIGS 1 and 2 show a press brake according to the invention.
  • This press brake comprises an upper deck 1 and a lower deck 2 mounted in a frame formed by two flanges 9a and 9b joined together notably by a bracing beam (not shown).
  • the upper aprons 1 and lower 2 are contained in the same vertical plane and the upper apron slides with respect to the flanges 9a and 9b using guide means 8a and 8b constituted for example by two hydraulic cylinders.
  • the working edges of these two upper and lower aprons respectively carry a folding punch P and a corresponding matrix M.
  • the bending angle of a metal sheet or sheet depends on the extent of the penetration of the punch P inside the die
  • the lower apron 2 is constituted by a plate provided with two slots 3a and 3b symmetrically identical with respect to the median transverse plane of the lower apron represented in FIG. 1 by the section line II— II.
  • Each slot 3a and 3b has an upper wall 31a and
  • Each slot comprises, in addition, a bottom connecting the upper walls 31a and 31b and lower 32a and 32b at the central zone of the lower apron as well as an opening situated at the level of the corresponding lateral edges of said lower apron 2.
  • the upper walls 31a and 31b are inclined at an angle relative to the lower walls 32a and 32b arranged horizontally. This angle can, of course, vary according to the displacement member fitted to said slots or else according to the range of press brake used.
  • the lower apron 2 comprises an upper part 22 and a lower part 21 situated respectively above and below the two slots 3a and 3b.
  • the lower part 21 of the lower deck 2 is fixed at its ends to the flanges 9a and 9b forming the frame of the press brake.
  • the lower part 21 can be fixed by welding or any other means.
  • the upper part 22 of the lower deck 2 is in turn only connected to the lower part 21 by means of the central zone located between the two bottoms of said slots 3a and 3b.
  • each slot 3a and 3b is equipped with a displacement member 6a and 6b connecting the upper part 22 and the lower part 21 of the lower deck 2.
  • the displacement members 6a and 6b are constituted by hydraulic cylinders.
  • Each hydraulic cylinder 6a and 6b comprises a cylinder 4a and 4b fixed to the lower wall 32a and 32b of each slot and a piston rod 5a and 5b connected to the upper wall 31a and 31b by screwing or any other means.
  • These hydraulic cylinders 6a and 6b are arranged at the opening of the slots so as to allow precise movement of the free ends of the upper walls 31a and 31b of said slots 3a and 3b, as will be described in detail later.
  • These hydraulic cylinders work in retraction, which allows a bringing together of the upper walls 31a and 31b respectively towards the lower walls 32a and 32b whereby the deformation curvature of the free upper part 22 of said lower apron 2 is modified before any operation folding, i.e. before the vertical movement of the upper deck 1.
  • control assembly 13 intended to independently control the stroke of each piston rod 5a and 5b of the hydraulic cylinders 6a and
  • the control assembly 13 allows an operator to enter the desired deformation curvature for each of the halves of the free upper part of the lower apron 2, these two halves being defined by the median transverse plane of said lower apron 2.
  • the assembly control unit 13 comprises a processing unit 11 constituted for example from a microprocessor. It also includes a keyboard 10 for introducing into the processing unit 11 the parameters of the deformation curvature to be produced for each half of the upper part 22 of the lower deck 2. The keyboard 10 could be replaced by any other acquisition means of data.
  • the processing unit 11 is coupled to a program memory 12.
  • the memory 12 contains in particular correspondence tables between the parameters of each deformation curvature which can be adjusted and the corresponding displacements which must be applied to the piston rods 5a and 5b of the hydraulic cylinders 6a and 6b.
  • the operator will also enter by means of the keyboard 10 data in the control unit concerning the nature of the sheet to be folded, its thickness, its length as well as the characteristics of the fold to be obtained (fold angle, dimensions of tools ).
  • the processing unit 11 is capable of sending displacement commands to each actuator 6a and 6b so that these bring the upper walls 31a and 31b respectively towards the lower walls 32a and 32b of the slots so that the deformation curvature of the upper part 22 of the lower deck 2 is perfectly parallel to the deformation curvature of the upper deck 1 during the bending phase of the sheet.
  • the jacks 6a and 6b will be locked in position during the folding phase of said sheet. So that the processing unit sends displacement commands to the jacks 6a and 6b, provision may be made to connect the inputs A and B of the processing unit li to two servo valves 14a and 14b supplied by pumps (not represented). These valves 14a and 14b will receive control signals from the processing unit 11 and will directly supply the jacks 6a and 6b.
  • control circuit 13 makes it possible to independently control each jack 6a and 6b, which makes it possible to produce eccentric folds on a sheet which would possibly be arranged only on one of the two halves of the lower deck 2, or else centered folds over the entire length of the lower deck 2, the jacks 6a and 6b then receiving in this case, the same movement instructions.
  • control assembly 13 comprises measurement means 7a and 7b arranged at the openings of the two slots 3a and 3b. These measurement means have the function of measuring the distance between the free end of the upper part 22 and the end fixed of the lower part 21 of the lower apron 2, in order to control the deformation curvature of the lower apron 2.
  • the processing unit then sends error correction instructions to the jacks 6a and 6b.
  • control assembly can permanently send error correction instructions to the displacement members 6a and
  • the invention is in no way limited to the embodiment described and shown which has been given only by way of example.
  • the displacement members 6a and 6b can be moved manually or electrically or by any other means constituting a technical equivalent.
  • each slot may be parallel to each other and in this case advantageously provision may be made to arrange the fixed part of the displacement member in a notch formed on the lower wall of each slot.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Press Drives And Press Lines (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

A bending press for bending metal sheets, the press comprising a moving top panel and a fixed bottom panel, the bottom panel being constituted by a plate having a top portion and a fixed bottom portion defined by two notches that are symmetrically identical about the transverse midplane of the bottom panel, each notch having a top wall and a bottom wall interconnected by a back wall, and also having an opening situated in the corresponding side edge of the plate, the press being characterized in that each notch is fitted with a displacement member interconnecting the free top portion and the fixed bottom portion of the bottom panel so as to cause the top wall of the notch to move towards the bottom wall thereof, thereby modifying the deformation curve of the free top portion of the bottom panel in controlled manner.

Description

Presse Plieuse à Tablier Inférieur Actif Active Lower Apron Press Brake
La présente invention concerne une presse plieuse pour le pliage de feuilles métalliques du type comportant un tablier supérieur disposé au-dessus d'un tablier inférieur, ce dernier étant fixe en appui à ses extrémités tandis que le tablier supérieur est mobile et actionné dans un plan vertical par des organes d'entraînement situés également à ses deux extrémités.The present invention relates to a press brake for folding metal sheets of the type comprising an upper deck arranged above a lower deck, the latter being fixed in abutment at its ends while the upper deck is movable and actuated in a plane vertical by drive members also located at its two ends.
Les organes d'entraînement fournissent la force nécessaire au pliage des feuilles métalliques ou des tôles et celles-ci provoquent la déformation des deux tabliers en sens inverse.The drive members provide the force necessary to bend the metal sheets or sheets and these cause the deformation of the two decks in the opposite direction.
En effet, avec ce type de construction, sous l'action des efforts de pliage, les courbes de déformation longitudinale des tabliers, chacune sous forme d'un arc unique, sont sensiblement symétriques par rapport au plan de séparation des tabliers de telle sorte que l'écart maximum entre les tabliers se situe au voisinage du milieu des points de poussée (organes d'entraînement et appuis fixes) et représente deux fois la déformation maximale de chaque tablier.In fact, with this type of construction, under the action of the bending forces, the longitudinal deformation curves of the decks, each in the form of a single arc, are substantially symmetrical with respect to the plane of separation of the decks so that the maximum distance between the decks is located near the middle of the thrust points (drive members and fixed supports) and represents twice the maximum deformation of each deck.
L'écart maximum entre les tabliers supérieur et inférieur est un paramètre essentiel de la précision et de la qualité du pli réalisé et dans le cas mentionné précédemment, les deux tabliers étant plus écartés au milieu qu'aux extrémités, le pli sera plus ouvert au centre qu'auxdites extrémités.The maximum difference between the upper and lower aprons is an essential parameter of the precision and quality of the fold produced and in the case mentioned above, the two aprons being more apart in the middle than at the ends, the fold will be more open to the center only at said ends.
Pour pallier cet inconvénient, une solution est proposée par le modèle d'utilité japonais 2 558 928 qui décrit une presse plieuse comprenant un tablier supérieur mobile et un tablier inférieur fixe constitué par une plaque d'épaisseur uniforme dans laquelle sont réalisées deux fentes symétriquement identiques par rapport au plan transversal médian dudit tablier inférieur. Chaque fente comporte une paroi supérieure et une paroi inférieure reliées par un fond ainsi qu'une ouverture située au niveau des bords latéraux correspondants de la plaque.To overcome this drawback, a solution is proposed by the Japanese utility model 2 558 928 which describes a press brake comprising a movable upper deck and a fixed lower deck formed by a plate of uniform thickness in which two symmetrically identical slots are made. relative to the median transverse plane of said lower deck. Each slot has an upper wall and a lower wall connected by a bottom as well as an opening situated at the level of the corresponding lateral edges of the plate.
La plaque comporte ainsi une partie inférieure et une partie supérieure situées respectivement au-dessous et au-dessus des fentes. Avantageusement, la partie inférieure de la plaque est fixée à deux flasques qui soutiennent également le tablier supérieur, tandis que la partie supérieure de la plaque ou plus exactement ses extrémités sont libres de se déplacer dans un plan vertical.The plate thus comprises a lower part and an upper part situated respectively below and above the slots. Advantageously, the lower part of the plate is fixed to two flanges which also support the upper deck, while the upper part of the plate or more exactly its ends are free to move in a vertical plane.
Dans ces conditions, sous l'action des efforts de pliage, on obtient pour les deux bords de travail des tabliers supérieur et inférieur, des courbures de déformations longitudinales aussi parallèles que possible et donc aussi voisines que possible.Under these conditions, under the action of the bending forces, one obtains for the two working edges of the upper and lower aprons, longitudinal deformation curvatures as parallel as possible and therefore as close as possible.
Ce modèle d'utilité japonais indique également que les fentes sont chacune pourvues d'un organe mobile dont la position est réglable manuellement ou automatiquement, à l'intérieur des fentes. Cet organe mobile est directement en contact avec les parois inférieure et supérieure de chaque fente et son déplacement permet de limiter virtuellement la profondeur desdites fentes et donc de diminuer au fur et à mesure que l'organe mobile se rapproche des ouvertures, l'élasticité du tablier inférieur. L'utilisation de ce type de presse plieuse ne permet pas, malheureusement, de contrôler parfaitement le parallélisme des courbures de déformation des bords en regard des tabliers inférieur et supérieur.This Japanese utility model also indicates that the slots are each provided with a movable member whose position is adjustable manually or automatically, inside the slots. This movable member is directly in contact with the lower and upper walls of each slot and its movement makes it possible to virtually limit the depth of said slots and therefore to decrease as the movable member approaches the openings, the elasticity of the lower apron. The use of this type of press brake does not, unfortunately, allow perfect control of the parallelism of the deformation curvatures of the edges opposite the lower and upper decks.
En effet, la pression s'exerçant sur la partie supérieure libre du tablier inférieur n'est fonction que de l'effort appliqué par le travail des organes d'entraînement sur le tablier supérieur et donc par voie de conséquence par la tôle à plier et rien dans ces conditions ne permet d'agir de façon volontaire sur ces pressions et donc sur les déformations de ladite partie supérieure du tablier inférieur afin que celles-ci soient parfaitement parallèles aux déformations du tablier supérieur.Indeed, the pressure exerted on the free upper part of the lower deck is only a function of the force applied by the work of the drive members on the upper deck and therefore consequently by the sheet to be bent and nothing under these conditions makes it possible to act voluntarily on these pressures and therefore on the deformations of said upper part of the lower deck so that these are perfectly parallel to the deformations of the upper deck.
En outre, lorsque l'organe mobile se situe sensiblement au niveau du fond de la fente et que l'effort appliqué par le travail des organes est important, la courbure de déformation du tablier inférieur est alors maximale et dans ce cas l'élasticité intrinsèque de la partie supérieure du tablier inférieur peut être irrémédiablement dégradée.In addition, when the movable member is located substantially at the bottom of the slot and the force applied by the work of the members is significant, the deformation curvature of the lower deck is then maximum and in this case the intrinsic elasticity of the upper part of the lower deck can be irreparably damaged.
La présente invention a pour but de surmonter les problèmes techniques précédemment mentionnés de manière satisfaisante.The object of the present invention is to overcome the above-mentioned technical problems in a satisfactory manner.
Ce but est atteint selon l'invention, au moyen d'une presse plieuse pour le pliage de feuilles métalliques du type comportant un tablier supérieur disposé au-dessus d'un tablier inférieur, le tablier inférieur étant fixe en appui à ses extrémités tandis que le tablier supérieur est mobile et actionné dans un plan vertical par des organes d'entraînement situés également à ses extrémités, le tablier inférieur étant constitué par une plaque comportant une partie supérieure libre et une partie inférieure fixe délimités par deux fentes symétriquement identiques par rapport au plan transversal médian dudit tablier inférieur, chaque fente comportant une paroi supérieure et une paroi inférieure reliées par un fond ainsi qu'une ouverture située au niveau des bords latéraux correspondants de la plaque, caractérisée en ce que chaque fente est équipée d'un organe de déplacement reliant la partie supérieure libre et la partie inférieure fixe du tablier inférieur pour provoquer un rapprochement de la paroi supérieure de la fente vers sa paroi inférieure, par quoi on modifie de façon contrôlée la courbure de déformation de la partie supérieure libre dudit tablier inférieur.This object is achieved according to the invention, by means of a press brake for folding metal sheets of the type comprising an upper apron disposed above a lower apron, the lower apron being fixed in abutment at its ends while apron upper is movable and actuated in a vertical plane by drive members also located at its ends, the lower deck being constituted by a plate comprising a free upper part and a fixed lower part delimited by two slots symmetrically identical with respect to the transverse plane median of said lower apron, each slot comprising an upper wall and a lower wall connected by a bottom as well as an opening situated at the level of the corresponding lateral edges of the plate, characterized in that each slot is equipped with a displacement member connecting the free upper part and the fixed lower part of the lower apron to bring the upper wall of the slot closer to its lower wall, whereby the deformation curvature of the free upper part of said lower apron is modified.
Selon une autre caractéristique, chaque organe de déplacement comprend d'une part une partie fixe reliée à la paroi inférieure de la fente et d'autre part une partie mobile solidaire de la paroi supérieure de la fente.According to another characteristic, each displacement member comprises on the one hand a fixed part connected to the lower wall of the slot and on the other hand a movable part secured to the upper wall of the slot.
Selon encore une autre caractéristique, chaque organe de déplacement est situé au niveau de l'ouverture des fentes, de façon à permettre un déplacement précis des extrémités libres des parois supérieures desdites fentes.According to yet another characteristic, each displacement member is located at the opening of the slots, so as to allow precise movement of the free ends of the upper walls of said slots.
Selon encore une autre caractéristique, la presse plieuse comprend un ensemble de commande pour commander indépendamment chaque organe de déplacement en fonction de la courbure que l'on veut donner à chaque extrémité de la partie supérieure libre du tablier inférieur.According to yet another characteristic, the press brake comprises a control assembly for independently controlling each displacement member as a function of the curvature which it is desired to give at each end of the free upper part of the lower deck.
Selon une autre caractéristique avantageuse, l'ensemble de commande comprend :According to another advantageous characteristic, the control assembly comprises:
- des moyens pour recevoir des informations sur la courbure que l'on veut donner à la partie supérieure libre du tablier inférieur ; et- Means for receiving information on the curvature that we want to give to the free upper part of the lower deck; and
- des moyens pour convertir lesdites informations de courbure en des informations de commande pour les organes de déplacement.- Means for converting said curvature information into control information for the displacement members.
Selon encore une autre caractéristique avantageuse, l'ensemble de commande comprend en outre des moyens de mesure pour obtenir des informations sur la courbure effective de la partie supérieure libre du tablier inférieur et la courbure programmée.According to yet another advantageous characteristic, the control assembly further comprises measurement means to obtain information on the effective curvature of the free upper part of the lower deck and the programmed curvature.
Ainsi, l'organe de déplacement selon l'invention permet de contrôler et de régler de manière sûre la courbure de déformation de la partie supérieure libre du tablier inférieur et ceci sans risque de dépasser la limite d'élasticité dudit tablier inférieur.Thus, the displacement member according to the invention makes it possible to control and securely adjust the curvature of deformation of the free upper part of the lower deck and this without risk of exceeding the elastic limit of said lower deck.
Par ailleurs, étant donné que la courbure de déformation du tablier inférieur n'est plus fonction de l'effort appliqué par le travail des organes d'entraînement sur le tablier supérieur, on comprend que par de simples calculs de résistance et de structure de la tôle à plier ainsi que du tablier supérieur, un réglage précis de l'organe de déplacement et donc du rapprochement de la paroi supérieure de la fente vers sa paroi inférieure permet d'obtenir des courbures de déformations des tabliers inférieur et supérieur parfaitement parallèles. L'invention sera mieux comprise à la lecture de la description qui va suivre, accompagnée des dessins sur lesquels :Furthermore, since the deformation curvature of the lower deck is no longer a function of the force applied by the work of the drive members on the upper deck, it is understood that by simple calculations of resistance and structure of the sheet metal to be folded as well as of the upper deck, precise adjustment of the displacement member and therefore of the bringing together of the upper wall of the slot towards its lower wall makes it possible to obtain deformation curvatures of the lower and upper decks which are perfectly parallel. The invention will be better understood on reading the description which follows, accompanied by the drawings in which:
- la figure 1 représente une vue schématique d'une presse plieuse selon l'invention avec des organes de déplacement,FIG. 1 represents a schematic view of a press brake according to the invention with displacement members,
- la figure 2 représente une vue en coupe verticale selon la ligne II— II de la figure 1, etFIG. 2 represents a view in vertical section along the line II— II of FIG. 1, and
- la figure 3 représente une vue schématique d'un ensemble de commande pour commander les organes de déplacement.- Figure 3 shows a schematic view of a control assembly for controlling the movement members.
Les figures 1 et 2 représentent une presse plieuse selon l'invention. Cette presse plieuse comprend un tablier supérieur 1 et un tablier inférieur 2 montés dans un bâti formé de deux flasques 9a et 9b réunis entre eux notamment par une poutre de contreventement (non représentée).Figures 1 and 2 show a press brake according to the invention. This press brake comprises an upper deck 1 and a lower deck 2 mounted in a frame formed by two flanges 9a and 9b joined together notably by a bracing beam (not shown).
Les tabliers supérieur 1 et inférieur 2 sont contenus dans un même plan vertical et le tablier supérieur coulisse par rapport aux flasques 9a et 9b à l'aide de moyens de guidage 8a et 8b constitués par exemple par deux vérins hydrauliques.The upper aprons 1 and lower 2 are contained in the same vertical plane and the upper apron slides with respect to the flanges 9a and 9b using guide means 8a and 8b constituted for example by two hydraulic cylinders.
Les bords de travail de ces deux tabliers supérieur et inférieur portent respectivement un poinçon de pliage P et une matrice correspondante M. L'angle de pliage d'une tôle ou feuille métallique dépend de l'importance de la pénétration du poinçon P à l'intérieur de la matriceThe working edges of these two upper and lower aprons respectively carry a folding punch P and a corresponding matrix M. The bending angle of a metal sheet or sheet depends on the extent of the penetration of the punch P inside the die
M, et par conséquent pour obtenir un pliage à angle constant sur toute la longueur du pli, il est nécessaire que cette pénétration soit la même sur toute cette longueur.M, and therefore to obtain a constant angle folding over the entire length of the fold, this penetration must be the same over this entire length.
Le tablier inférieur 2 est constitué par une plaque pourvue de deux fentes 3a et 3b symétriquement identiques par rapport au plan transversal médian du tablier inférieur représenté sur la figure 1 par la ligne de coupe II— II. Chaque fente 3a et 3b comporte une paroi supérieure 31a etThe lower apron 2 is constituted by a plate provided with two slots 3a and 3b symmetrically identical with respect to the median transverse plane of the lower apron represented in FIG. 1 by the section line II— II. Each slot 3a and 3b has an upper wall 31a and
31b et une paroi inférieure 32a et 32b disposées transversalement par rapport à la plaque formant le tablier inférieur 2.31b and a lower wall 32a and 32b arranged transversely relative to the plate forming the lower deck 2.
Chaque fente comporte, en outre, un fond reliant les parois supérieure 31a et 31b et inférieure 32a et 32b au niveau de la zone centrale du tablier inférieur ainsi qu'une ouverture située au niveau des bords latéraux correspondants dudit tablier inférieur 2.Each slot comprises, in addition, a bottom connecting the upper walls 31a and 31b and lower 32a and 32b at the central zone of the lower apron as well as an opening situated at the level of the corresponding lateral edges of said lower apron 2.
Les parois supérieures 31a et 31b sont inclinées d'un certain angle par rapport aux parois inférieures 32a et 32b disposées horizontalement. Cet angle peut, bien entendu, varier suivant l'organe de déplacement équipant lesdites fentes ou bien suivant la gamme de presse plieuse utilisée.The upper walls 31a and 31b are inclined at an angle relative to the lower walls 32a and 32b arranged horizontally. This angle can, of course, vary according to the displacement member fitted to said slots or else according to the range of press brake used.
Ainsi, le tablier inférieur 2 comprend une partie supérieure 22 et une partie inférieure 21 situées respectivement au-dessus et au- dessous des deux fentes 3a et 3b. Comme on peut le voir sur la figure 2, la partie inférieure 21 du tablier inférieur 2 est fixée à ses extrémités aux flasques 9a et 9b formant le bâti de la presse plieuse.Thus, the lower apron 2 comprises an upper part 22 and a lower part 21 situated respectively above and below the two slots 3a and 3b. As can be seen in Figure 2, the lower part 21 of the lower deck 2 is fixed at its ends to the flanges 9a and 9b forming the frame of the press brake.
La fixation de la partie inférieure 21 peut être réalisée par soudure ou tout autre moyen. La partie supérieure 22 du tablier inférieur 2 est quant à elle uniquement reliée à la partie inférieure 21 au moyen de la zone centrale située entre les deux fonds desdites fentes 3a et 3b.The lower part 21 can be fixed by welding or any other means. The upper part 22 of the lower deck 2 is in turn only connected to the lower part 21 by means of the central zone located between the two bottoms of said slots 3a and 3b.
Ainsi, la partie supérieure 22 du tablier inférieur 2 possède un degré de liberté dans le plan vertical grâce à quoi ses extrémités libres peuvent être déplacées par rapport aux extrémités fixes de la partie inférieure 21. Selon la présente invention, chaque fente 3a et 3b est équipée d'un organe de déplacement 6a et 6b reliant la partie supérieure 22 et la partie inférieure 21 du tablier inférieur 2.Thus, the upper part 22 of the lower deck 2 has a degree of freedom in the vertical plane by which its free ends can be moved relative to the fixed ends of the lower part 21. According to the present invention, each slot 3a and 3b is equipped with a displacement member 6a and 6b connecting the upper part 22 and the lower part 21 of the lower deck 2.
Dans le mode de réalisation représenté sur les figures 1 et 3, les organes de déplacement 6a et 6b sont constitués par des vérins hydrauliques.In the embodiment shown in Figures 1 and 3, the displacement members 6a and 6b are constituted by hydraulic cylinders.
Chaque vérin hydraulique 6a et 6b comprend un cylindre 4a et 4b fixé à la paroi inférieure 32a et 32b de chaque fente et une tige de piston 5a et 5b reliée à la paroi supérieure 31a et 31b par vissage ou tout autre moyen.Each hydraulic cylinder 6a and 6b comprises a cylinder 4a and 4b fixed to the lower wall 32a and 32b of each slot and a piston rod 5a and 5b connected to the upper wall 31a and 31b by screwing or any other means.
Ces vérins hydrauliques 6a et 6b sont disposés au niveau de l'ouverture des fentes de façon à permettre un déplacement précis des extrémités libres des parois supérieures 31a et 31b desdites fentes 3a et 3b, comme cela sera décrit en détail ultérieurement. Ces vérins hydrauliques travaillent en rétraction, ce qui permet un rapprochement des parois supérieures 31a et 31b respectivement vers les parois inférieures 32a et 32b par quoi on modifie de façon contrôlée la courbure de déformation de la partie supérieure libre 22 dudit tablier inférieur 2 avant toute opération de pliage, c'est-à-dire avant le déplacement vertical du tablier supérieur 1.These hydraulic cylinders 6a and 6b are arranged at the opening of the slots so as to allow precise movement of the free ends of the upper walls 31a and 31b of said slots 3a and 3b, as will be described in detail later. These hydraulic cylinders work in retraction, which allows a bringing together of the upper walls 31a and 31b respectively towards the lower walls 32a and 32b whereby the deformation curvature of the free upper part 22 of said lower apron 2 is modified before any operation folding, i.e. before the vertical movement of the upper deck 1.
En se référant maintenant à la figure 3, on va décrire un ensemble de commande 13 destiné à commander indépendamment la course de chaque tige de piston 5a et 5b des vérins hydrauliques 6a etReferring now to FIG. 3, there will be described a control assembly 13 intended to independently control the stroke of each piston rod 5a and 5b of the hydraulic cylinders 6a and
6b en fonction de la courbure que l'on veut donner à chacune des extrémités de la partie supérieure 22 du tablier inférieur 2.6b as a function of the curvature which it is desired to give to each of the ends of the upper part 22 of the lower deck 2.
L'ensemble de commande 13 permet à un opérateur d'entrer la courbure de déformation souhaitée pour chacune des moitiés de la partie supérieure libre du tablier inférieur 2, ces deux moitiés étant définies par le plan transversal médian dudit tablier inférieur 2. L'ensemble de commande 13 comprend une unité de traitement 11 constituée par exemple à partir d'un microprocesseur. Il comprend également un clavier 10 pour introduire dans l'unité de traitement 11 les paramètres de la courbure de déformation à réaliser pour chaque moitié de la partie supérieure 22 du tablier inférieur 2. Le clavier 10 pourrait être remplacé par tout autre moyen d'acquisition de données. L'unité de traitement 11 est couplée à une mémoire de programme 12. La mémoire 12 contient en particulier des tables de correspondance entre les paramètres de chaque courbure de déformation qui peut être réglée et les déplacements correspondants qui doivent être appliqués aux tiges de pistons 5a et 5b des vérins hydrauliques 6a et 6b.The control assembly 13 allows an operator to enter the desired deformation curvature for each of the halves of the free upper part of the lower apron 2, these two halves being defined by the median transverse plane of said lower apron 2. The assembly control unit 13 comprises a processing unit 11 constituted for example from a microprocessor. It also includes a keyboard 10 for introducing into the processing unit 11 the parameters of the deformation curvature to be produced for each half of the upper part 22 of the lower deck 2. The keyboard 10 could be replaced by any other acquisition means of data. The processing unit 11 is coupled to a program memory 12. The memory 12 contains in particular correspondence tables between the parameters of each deformation curvature which can be adjusted and the corresponding displacements which must be applied to the piston rods 5a and 5b of the hydraulic cylinders 6a and 6b.
Par ailleurs, l'opérateur entrera également au moyen du clavier 10 des données dans l'unité de commande concernant la nature de la tôle à plier, son épaisseur, sa longueur ainsi que les caractéristiques du pli à obtenir (angle de pli, dimensions de l'outillage...).Furthermore, the operator will also enter by means of the keyboard 10 data in the control unit concerning the nature of the sheet to be folded, its thickness, its length as well as the characteristics of the fold to be obtained (fold angle, dimensions of tools ...).
Grâce à ces tables et aux données de l'opérateur, l'unité de traitement 11 est susceptible d'envoyer des commandes de déplacement à chaque vérin 6a et 6b afin que ceux-ci rapprochent les parois supérieures 31a et 31b respectivement vers les parois inférieures 32a et 32b des fentes afin que la courbure de déformation de la partie supérieure 22 du tablier inférieur 2 soit parfaitement parallèle à la courbure de déformation du tablier supérieur 1 lors de la phase de pliage de la tôle. Il faut également noter que les vérins 6a et 6b seront bloqués en position lors de la phase de pliage de ladite tôle. Afin que l'unité de traitement envoie des commandes de déplacement aux vérins 6a et 6b, on pourra prévoir de relier les entrées A et B de l'unité de traitement li a deux valves d'asservissement 14a et 14b alimentées par des pompes (non représentées). Ces valves 14a et 14b recevront des signaux de commande depuis l'unité de traitement 11 et alimenteront directement les vérins 6a et 6b.Thanks to these tables and to the operator's data, the processing unit 11 is capable of sending displacement commands to each actuator 6a and 6b so that these bring the upper walls 31a and 31b respectively towards the lower walls 32a and 32b of the slots so that the deformation curvature of the upper part 22 of the lower deck 2 is perfectly parallel to the deformation curvature of the upper deck 1 during the bending phase of the sheet. It should also be noted that the jacks 6a and 6b will be locked in position during the folding phase of said sheet. So that the processing unit sends displacement commands to the jacks 6a and 6b, provision may be made to connect the inputs A and B of the processing unit li to two servo valves 14a and 14b supplied by pumps (not represented). These valves 14a and 14b will receive control signals from the processing unit 11 and will directly supply the jacks 6a and 6b.
Ainsi, le circuit de commande 13 permet de commander indépendamment chaque vérin 6a et 6b, ce qui permet de réaliser des plis excentrés sur une tôle qui serait éventuellement disposée uniquement sur l'une des deux moitiés du tablier inférieur 2, ou bien des plis centrés sur toute la longueur du tablier inférieur 2, les vérins 6a et 6b recevant alors dans ce cas, les mêmes instructions de déplacement.Thus, the control circuit 13 makes it possible to independently control each jack 6a and 6b, which makes it possible to produce eccentric folds on a sheet which would possibly be arranged only on one of the two halves of the lower deck 2, or else centered folds over the entire length of the lower deck 2, the jacks 6a and 6b then receiving in this case, the same movement instructions.
De plus, l'ensemble de commande 13 comprend des moyens de mesures 7a et 7b disposés au niveau des ouvertures des deux fentes 3a et 3b. Ces moyens de mesure ont pour fonction de mesurer la distance entre l'extrémité libre de la partie supérieure 22 et l'extrémité fixe de la partie inférieure 21 du tablier inférieur 2, afin de contrôler la courbure de déformation du tablier inférieur 2.In addition, the control assembly 13 comprises measurement means 7a and 7b arranged at the openings of the two slots 3a and 3b. These measurement means have the function of measuring the distance between the free end of the upper part 22 and the end fixed of the lower part 21 of the lower apron 2, in order to control the deformation curvature of the lower apron 2.
Les mesures prises par ces moyens de mesures 7a et 7b sont ensuite reçues par l'unité de traitement aux niveaux des entrées C et D. Ces mesures de la courbure de déformation de chaque moitié du tablier inférieur 2 sont comparées à celles qui ont été initialement introduites dans l'unité de traitement.The measurements taken by these measurement means 7a and 7b are then received by the processing unit at the levels of the inputs C and D. These measurements of the deformation curvature of each half of the lower deck 2 are compared with those which were initially introduced into the processing unit.
Dans le cas où les courbures de déformation recueillies par les moyens de mesure 7a et 7b ne sont pas conformes aux courbures programmées, l'unité de traitement envoie alors vers les vérins 6a et 6b des instructions de corrections d'erreurs.In the event that the deformation curvatures collected by the measuring means 7a and 7b do not conform to the programmed curvatures, the processing unit then sends error correction instructions to the jacks 6a and 6b.
Bien entendu, d'autres moyens de mesure sous forme de capteurs de force qui mesurent en permanence la force de pliage réellement appliquée et sa répartition par rapport au plan de symétrie de la presse ainsi que des capteurs de position qui mesurent en permanence les positions relatives des extrémités du tablier supérieur 1 et du tablier inférieur 2 peuvent être également couplés à l'unité de traitement 11.Of course, other measuring means in the form of force sensors which permanently measure the bending force actually applied and its distribution with respect to the plane of symmetry of the press as well as position sensors which permanently measure the relative positions the ends of the upper deck 1 and of the lower deck 2 can also be coupled to the processing unit 11.
Par ailleurs, si un défaut de parallélisme entre le tablier inférieur et le tablier supérieur apparaît lors du pliage de la tôle, il est clair que l'ensemble de commande peut en permanence envoyer des instructions de corrections d'erreurs aux organes de déplacement 6a etFurthermore, if a defect in parallelism between the lower deck and the upper deck occurs during the folding of the sheet, it is clear that the control assembly can permanently send error correction instructions to the displacement members 6a and
6b.6b.
Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit et représenté qui n'a été donné qu'à titre d'exemple. En particulier les organes de déplacement 6a et 6b peuvent être mus manuellement ou électriquement ou par tout autre moyen constituant un équivalent technique.Of course, the invention is in no way limited to the embodiment described and shown which has been given only by way of example. In particular, the displacement members 6a and 6b can be moved manually or electrically or by any other means constituting a technical equivalent.
De même, les parois supérieure et inférieure de chaque fente peuvent être parallèles entre elles et dans ce cas on pourra prévoir avantageusement de disposer la partie fixe de l'organe de déplacement dans une échancrure réalisée sur la paroi inférieure de chaque fente. Likewise, the upper and lower walls of each slot may be parallel to each other and in this case advantageously provision may be made to arrange the fixed part of the displacement member in a notch formed on the lower wall of each slot.

Claims

REVENDICATIONS
1. Presse plieuse pour le pliage de feuilles métalliques du type comportant un tablier supérieur (1) disposé au-dessus d'un tablier inférieur (2), le tablier inférieur (2) étant fixe en appui à ses extrémités tandis que le tablier supérieur (1) est mobile et actionné dans un plan vertical par des organes d'entraînement (8a, 8b) situés également à ses extrémités, le tablier inférieur étant constitué par une plaque comportant une partie supérieure (22) libre et une partie inférieure (21) fixe délimitées par deux fentes (3a, 3b) symétriquement identiques par rapport au plan transversal médian dudit tablier inférieur, chaque fente comportant une paroi supérieure (31a, 31b) et une paroi inférieure (32a, 32b) reliées par un fond ainsi qu'une ouverture située au niveau des bords latéraux correspondants de la plaque, caractérisée en ce que chaque fente (3a, 3b) est équipée d'un organe de déplacement (6a, 6b) reliant la partie supérieure libre (22) et la partie inférieure fixe (21) du tablier inférieur pour provoquer un rapprochement de la paroi supérieure de la fente vers sa paroi inférieure, par quoi on modifie de façon contrôlée la courbure de déformation de la partie supérieure libre dudit tablier inférieur.1. Press brake for folding metal sheets of the type comprising an upper deck (1) disposed above a lower deck (2), the lower deck (2) being fixed in abutment at its ends while the upper deck (1) is movable and actuated in a vertical plane by drive members (8a, 8b) also located at its ends, the lower deck being constituted by a plate comprising a free upper part (22) and a lower part (21 ) fixed delimited by two slots (3a, 3b) symmetrically identical with respect to the median transverse plane of said lower apron, each slot having an upper wall (31a, 31b) and a lower wall (32a, 32b) connected by a bottom as well as an opening located at the corresponding lateral edges of the plate, characterized in that each slot (3a, 3b) is equipped with a displacement member (6a, 6b) connecting the free upper part (22) and the pa fixed lower rtie (21) of the lower apron to bring the upper wall of the slot closer to its lower wall, whereby the deformation curvature of the free upper part of said lower apron is modified.
2. Presse plieuse selon la revendication 1, caractérisée en ce que chaque organe de déplacement (6a, 6b) comprend d'une part une partie fixe (4a, 4b) reliée à la paroi inférieure (32a, 32b) de la fente et d'autre part une partie mobile (5a, 5b) solidaire de la paroi supérieure (31a, 31b) de la fente.2. Press brake according to claim 1, characterized in that each displacement member (6a, 6b) comprises on the one hand a fixed part (4a, 4b) connected to the lower wall (32a, 32b) of the slot and d 'other hand a movable part (5a, 5b) integral with the upper wall (31a, 31b) of the slot.
3. Presse plieuse selon la revendication 1, caractérisée en ce que chaque organe de déplacement (6a, 6b) est situé au niveau de l'ouverture des fentes, de façon à permettre un déplacement précis des extrémités libres des parois supérieures desdites fentes. 3. Press brake according to claim 1, characterized in that each displacement member (6a, 6b) is located at the opening of the slots, so as to allow precise movement of the free ends of the upper walls of said slots.
4. Presse plieuse selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comprend un ensemble de commande (13) pour commander indépendamment chaque organe de déplacement en fonction de la courbure que l'on veut donner à chaque extrémité de la partie supérieure libre du tablier inférieur. 4. Press brake according to any one of the preceding claims, characterized in that it comprises a control assembly (13) for independently controlling each displacement member as a function of the curvature which it is desired to give at each end of the free upper part of the lower deck.
5. Presse plieuse selon la revendication 4, caractérisée en ce que l'ensemble de commande (13) comprend : - des moyens (10) pour recevoir des informations sur la courbure que l'on veut donner à la partie supérieure libre du tablier inférieur ; et5. Press brake according to claim 4, characterized in that the control assembly (13) comprises: - Means (10) for receiving information on the curvature which it is desired to give to the free upper part of the lower deck; and
- des moyens (11) pour convertir lesdites informations de courbure en des informations de commande pour les organes de déplacements (6a, 6b).- Means (11) for converting said curvature information into control information for the displacement members (6a, 6b).
6. Presse plieuse selon la revendication 5, caractérisée en ce que l'ensemble de commande comprend en outre des moyens de mesure (7a, 7b) pour obtenir des informations sur la courbure effective de la partie supérieure libre du tablier inférieur et la courbure programmée. 6. Press brake according to claim 5, characterized in that the control assembly further comprises measurement means (7a, 7b) for obtaining information on the effective curvature of the free upper part of the lower deck and the programmed curvature .
EP99941714A 1998-09-09 1999-09-08 Press brake with active lower table Expired - Lifetime EP1112130B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9811240 1998-09-09
FR9811240A FR2782942B1 (en) 1998-09-09 1998-09-09 ACTIVE LOWER APRON BENDING PRESS
PCT/FR1999/002131 WO2000013813A1 (en) 1998-09-09 1999-09-08 Press brake with active lower table

Publications (2)

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EP1112130A1 true EP1112130A1 (en) 2001-07-04
EP1112130B1 EP1112130B1 (en) 2002-04-10

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US (1) US6401512B1 (en)
EP (1) EP1112130B1 (en)
JP (1) JP4434493B2 (en)
AT (1) ATE215854T1 (en)
DE (1) DE69901261T2 (en)
FR (1) FR2782942B1 (en)
WO (1) WO2000013813A1 (en)

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ES2382284A1 (en) * 2009-03-13 2012-06-06 Amada Europe Press brake for bending sheets
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Also Published As

Publication number Publication date
FR2782942B1 (en) 2000-12-01
DE69901261D1 (en) 2002-05-16
JP4434493B2 (en) 2010-03-17
US6401512B1 (en) 2002-06-11
ATE215854T1 (en) 2002-04-15
DE69901261T2 (en) 2002-11-28
EP1112130B1 (en) 2002-04-10
JP2002524259A (en) 2002-08-06
WO2000013813A1 (en) 2000-03-16
FR2782942A1 (en) 2000-03-10

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