EP1112130B1 - Press brake with active lower table - Google Patents
Press brake with active lower table Download PDFInfo
- Publication number
- EP1112130B1 EP1112130B1 EP99941714A EP99941714A EP1112130B1 EP 1112130 B1 EP1112130 B1 EP 1112130B1 EP 99941714 A EP99941714 A EP 99941714A EP 99941714 A EP99941714 A EP 99941714A EP 1112130 B1 EP1112130 B1 EP 1112130B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bottom panel
- notch
- wall
- free
- panel
- 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.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- 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 the folding of metal sheets of the type comprising an upper deck disposed above a lower deck, the latter being fixed in support of its ends while the upper deck is movable and actuated in a vertical plane by drive members also located at its two ends.
- the drive bodies provide the necessary force to bending of metal sheets or sheets and these cause the deformation of the two aprons in opposite directions.
- the longitudinal deformation curves of the decks are substantially symmetrical by compared to the deck separation plan so that the gap maximum between the aprons is located near the middle of the thrust (drives and fixed supports) and represents twice the maximum deformation of each deck.
- the maximum distance 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 spread in the middle than at the ends, the fold will be more open in the center than at said ends.
- Each slot has an upper wall and a wall lower connected by a bottom as well as an opening located at the level corresponding side edges of the plate.
- the plate thus has a lower part and a part upper located respectively below and above the slots.
- the lower part of the plate is fixed to two flanges which also support the upper apron, 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 organ mobile is directly in contact with the lower walls and upper of each slot and its movement makes it possible to limit virtually the depth of said slots and therefore decrease as and as the movable member approaches the openings, the elasticity of the lower apron.
- the pressure exerted on the free upper part of the lower deck depends only on the force applied by the work drive members on the upper deck and therefore by way of consequence by the sheet to bend and nothing in these conditions allows 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 curvature of deformation of the lower deck is then maximum and in this case the intrinsic elasticity of the part upper part of the lower deck can be irreparably degraded.
- the object of the present invention is to overcome the problems previously mentioned techniques satisfactorily.
- a press folding machine for folding metal sheets of the type comprising a upper apron arranged above a lower apron, the apron lower being fixed in support at its ends while the apron upper is mobile and actuated in a vertical plane by 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 symmetrically slits identical with respect to the median transverse plane of said lower deck, each slot having an upper wall and a lower wall connected by a bottom and an opening located at the edges corresponding sides of the plate, characterized in that each slot is equipped with a displacement member connecting the upper part free and the fixed lower part of the lower apron to cause a approximation of the upper wall of the slot towards its lower wall, whereby the deformation curvature of the free upper part of said lower apron.
- each organ of movement comprises on the one hand a fixed part connected to the wall bottom of the slot and on the other hand a movable part secured to the upper wall of the slot.
- each organ of displacement is located at the opening of the slots, so that allow precise movement of the free ends of the walls upper of said slots.
- the press brake includes control set for ordering independently each displacement member depending on the curvature that we want to give to each end of the upper part free of the lower apron.
- control unit further comprises measuring means to obtain information on the effective curvature of the part upper free of the lower bulkhead and the programmed curvature.
- the displacement member according to the invention makes it possible to safely check and adjust the deflection curvature of the free upper part of the lower apron and this without risk of exceeding the elastic limit of said lower apron.
- Figures 1 and 2 show a press brake according to the invention.
- This press brake includes an upper deck 1 and a lower apron 2 mounted in a frame formed by two flanges 9a and 9b joined together notably by a bracing beam (not shown).
- the upper 1 and lower 2 aprons are contained in a same vertical plane and the upper apron slides in relation to flanges 9a and 9b using guide means 8a and 8b constituted by example by two hydraulic cylinders.
- the bending angle of a metal sheet or sheet depends on the importance of the penetration of the punch P inside the die M, and therefore to obtain a constant angle bending over the entire length of the fold, this penetration must be the same on all this length.
- the lower apron 2 is constituted by a plate provided with two slots 3a and 3b symmetrically identical with respect to the plane transverse median of the lower deck shown in Figure 1 by the cutting line II-II.
- Each slot 3a and 3b has an upper wall 31a and 31b and a bottom wall 32a and 32b arranged transversely by relative to the plate forming the lower deck 2.
- Each slot has, in addition, a bottom connecting the walls upper 31a and 31b and lower 32a and 32b at the zone level center of the lower deck as well as an opening at the level of the corresponding side edges of said lower apron 2.
- the upper walls 31a and 31b are inclined by a certain angle with respect to the lower walls 32a and 32b arranged horizontally. This angle can, of course, vary depending on the organ displacement fitted to said slots or else according to the range of press brake used.
- the lower deck 2 comprises an upper part 22 and a lower part 21 situated respectively above and below of 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 fixing of the lower part 21 can be carried out by solder 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.
- the upper part 22 of the lower deck 2 has a degree of freedom in the vertical plane whereby its free ends can be moved relative to the fixed ends of the part lower 21.
- each slot 3a and 3b is equipped 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 jacks Hydraulic.
- Each hydraulic cylinder 6a and 6b comprises a cylinder 4a and 4b fixed to the bottom wall 32a and 32b of each slot and a rod piston 5a and 5b connected to the upper wall 31a and 31b by screwing or all other way.
- 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.
- control assembly 13 for independently controlling the stroke of each piston rod Sa and 5b of the hydraulic cylinders 6a and 6b depending on the curvature that we want to give to each of the ends of the upper part 22 of the lower deck 2.
- the control assembly 13 allows an operator to enter the desired deformation curvature for each of the halves of the free upper part of lower deck 2, these two halves being defined by the median transverse plane of said lower deck 2.
- the control assembly 13 includes a processing 11 constituted for example from a microprocessor. he also includes a keyboard 10 for entering the unit processing 11 the parameters of the deformation curvature to be produced for each half of the upper part 22 of the lower deck 2.
- Keyboard 10 could be replaced by any other means data acquisition.
- the processing unit 11 is coupled to a program memory 12.
- Memory 12 contains in particular correspondence tables between the parameters of each curvature of deformation which can be adjusted and the corresponding displacements which must be applied to the piston rods 5a and 5b of the cylinders hydraulics 6a and 6b.
- the operator will also enter using the keyboard 10 of the data in the control unit concerning the nature of the sheet to be folded, its thickness, its length and the characteristics of the fold to be obtained (fold angle, dimensions of tools ).
- the unit of processing 11 is likely to send move commands to each cylinder 6a and 6b so that these bring the walls together upper 31a and 31b respectively towards the lower walls 32a and 32b of the slots so that the deformation curvature of the part upper 22 of the lower deck 2 is perfectly parallel to the deformation curvature of the upper deck 1 during the folding of the sheet. It should also be noted that cylinders 6a and 6b will be locked in position during the folding phase of said sheet.
- control valves 14a and 14b supplied by pumps (not shown). These valves 14a and 14b will receive control signals from the processing unit 11 and directly feed the cylinders 6a and 6b.
- control circuit 13 makes it possible to control independently each cylinder 6a and 6b, which makes it possible to carry out eccentric folds on a sheet which may be arranged only on one of the two halves of the lower apron 2, or else folds centered over the entire length of the lower apron 2, the jacks 6a and 6b then receiving in this case the same movement instructions.
- control assembly 13 comprises means measures 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 from the lower part 21 of the lower deck 2, in order to control the deformation curvature of the lower deck 2.
- the measurements taken by these measurement means 7a and 7b are then received by the processing unit at the levels of inputs C and D. These measurements of the deformation curvature of each half of the deck lower 2 are compared to those that were originally introduced in the processing unit.
- the processing unit then sends to cylinders 6a and 6b error correction instructions.
- control assembly can continuously send error correction instructions to the displacement members 6a and 6b.
- the invention is in no way limited to the mode of realization described and represented which was 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 can be parallel to each other and in this case we can plan advantageously to have the fixed part of the displacement member in a notch made on the bottom wall of each slot.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Press Drives And Press Lines (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Presses And Accessory Devices Thereof (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
Description
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'entraínement situés également à ses deux extrémités.The present invention relates to a press brake for the folding of metal sheets of the type comprising an upper deck disposed above a lower deck, the latter being fixed in support of its ends while the upper deck is movable and actuated in a vertical plane by drive members also located at its two ends.
Les organes d'entraínement 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 bodies provide the necessary force to bending of metal sheets or sheets and these cause the deformation of the two aprons in opposite directions.
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'entraínement et appuis fixes) et représente deux fois la déformation maximale de chaque tablier.Indeed, with this type of construction, under the action of bending forces, the longitudinal deformation curves of the decks, each in the form of a single arc, are substantially symmetrical by compared to the deck separation plan so that the gap maximum between the aprons is located near the middle of the thrust (drives 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 distance 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 spread in the middle than at the ends, the fold will be more open in the center than 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.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 consisting of a plate of uniform thickness in which are made two symmetrically identical slots with respect to the plane transverse median of said lower apron.
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.Each slot has an upper wall and a wall lower connected by a bottom as well as an opening located at the level corresponding side edges of the plate.
La plaque comporte ainsi une partie inférieure et une partie supérieure situées respectivement au-dessous et au-dessus des fentes.The plate thus has a lower part and a part upper located respectively below and above the slots.
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.Advantageously, the lower part of the plate is fixed to two flanges which also support the upper apron, 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, we obtains upper and lower aprons for both working edges, 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.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 organ mobile is directly in contact with the lower walls and upper of each slot and its movement makes it possible to limit virtually the depth of said slots and therefore decrease as and as the movable member approaches the openings, the elasticity of the lower apron.
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.The use of this type of press brake does not allow, unfortunately, to perfectly control the parallelism of deformation curvatures of the edges opposite the lower aprons and superior.
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'entraínement 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 depends only on the force applied by the work drive members on the upper deck and therefore by way of consequence by the sheet to bend and nothing in these conditions allows 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 level of the bottom of the slit and that the force applied by the work of organs is important, the curvature of deformation of the lower deck is then maximum and in this case the intrinsic elasticity of the part upper part of the lower deck can be irreparably degraded.
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 problems previously mentioned techniques satisfactorily.
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'entraínement 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 folding machine for folding metal sheets of the type comprising a upper apron arranged above a lower apron, the apron lower being fixed in support at its ends while the apron upper is mobile and actuated in a vertical plane by 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 symmetrically slits identical with respect to the median transverse plane of said lower deck, each slot having an upper wall and a lower wall connected by a bottom and an opening located at the edges corresponding sides of the plate, characterized in that each slot is equipped with a displacement member connecting the upper part free and the fixed lower part of the lower apron to cause a approximation of the upper wall of the slot towards its lower wall, whereby the deformation curvature of the free upper part of said lower apron.
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 organ of movement comprises on the one hand a fixed part connected to the wall bottom 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 organ of displacement is located at the opening of the slots, so that allow precise movement of the free ends of the walls upper 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 includes control set for ordering independently each displacement member depending on the curvature that we want to give to each end of the upper part free of the lower apron.
Selon une autre caractéristique avantageuse, l'ensemble de commande comprend :
- des moyens pour recevoir des informations sur la courbure que l'on veut donner à la partie supérieure libre du tablier inférieur ; et
- des moyens pour convertir lesdites informations de courbure en des informations de commande pour les organes de déplacement.
- means for receiving information on the curvature which it is desired to give to the free upper part of the lower deck; and
- 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 unit further comprises measuring means to obtain information on the effective curvature of the part upper free of the lower bulkhead 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 safely check and adjust the deflection curvature of the free upper part of the lower apron and this without risk of exceeding the elastic limit of said lower apron.
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'entraínement 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.Furthermore, given that the deformation curvature of the lower deck is no longer a function of the force applied by the work of drive members on the upper deck, we understand that by simple strength and structure calculations of the sheet to be bent and of the upper deck, precise adjustment of the displacement member and therefore the approximation of the upper wall of the slot towards its wall lower allows to obtain curvatures of deformations of the decks lower and upper perfectly parallel.
L'invention sera mieux comprise à la lecture de la description qui va suivre, accompagnée des dessins sur lesquels :
- la figure 1 représente une vue schématique d'une presse plieuse selon l'invention avec des organes de déplacement,
- la figure 2 représente une vue en coupe verticale selon la ligne II-II de la figure 1, et
- la figure 3 représente une vue schématique d'un ensemble de commande pour commander les organes de déplacement.
- 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 represents a schematic view of a control assembly for controlling the displacement members.
Les figures 1 et 2 représentent une presse plieuse selon l'invention.Figures 1 and 2 show a press brake according to the 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).This press brake includes an upper deck 1 and a
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 1 and lower 2 aprons are contained in a
same vertical plane and the upper apron slides in relation to
Les bords de travail de ces deux tabliers supérieur et inférieur portent respectivement un poinçon de pliage P et une matrice correspondante M. The working edges of these two upper and lower aprons carry a folding punch P and a die respectively correspondent 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 matrice 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.The bending angle of a metal sheet or sheet depends on the importance of the penetration of the punch P inside the die M, and therefore to obtain a constant angle bending over the entire length of the fold, this penetration must be the same on all this 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.The
Chaque fente 3a et 3b comporte une paroi supérieure 31a et
31b et une paroi inférieure 32a et 32b disposées transversalement par
rapport à la plaque formant le tablier inférieur 2.Each
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 has, in addition, a bottom connecting the walls
upper 31a and 31b and lower 32a and 32b at the zone level
center of the lower deck as well as an opening at the level of the
corresponding side edges of said
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
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.Thus, the
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.As can be seen in Figure 2, the
La fixation de la partie inférieure 21 peut être réalisée par
soudure ou tout autre moyen.The fixing of the
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
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. Thus, the
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.According to the present invention, each
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 FIGS. 1 and 3,
the
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
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.These
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 work in retraction, which
allows a bringing together of the
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 Sa et 5b des vérins hydrauliques 6a et
6b en fonction de la courbure que l'on veut donner à chacune des
extrémités de la partie supérieure 22 du tablier inférieur 2.Referring now to Figure 3, we will describe a
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.The
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.The
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.
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...).In addition, the operator will also enter using the
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.Thanks to these tables and operator data, the unit of
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 lia 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.In order for the processing unit to send commands from
displacement to
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
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
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 inputs C and D. These measurements of the deformation curvature of each half of the deck lower 2 are compared to those that were originally introduced in 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 measurement means 7a and 7b do not conform to the curvatures
programmed, the processing unit then sends to
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 means of measurement in the form of
force sensors which continuously 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 measure continuously
the relative positions of the ends of the upper deck 1 and the deck
lower 2 can also be coupled to the
Par ailleurs, si un défaut de parallélisme entre le tablier
inférieur et le tablier supérieur apparaít 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 et
6b.Furthermore, if a defect in parallelism between the deck
lower and the upper apron appears when folding the sheet, it is
clear that the control assembly can continuously send
error correction instructions to the
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 mode of
realization described and represented which was given only by way of example. In
in particular the
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 top and bottom walls of each slot can be parallel to each other and in this case we can plan advantageously to have the fixed part of the displacement member in a notch made on the bottom wall of each slot.
Claims (6)
- A bending press for bending sheet metal, the press being of the type comprising a top panel (1) disposed above a bottom panel (2), the bottom panel (2) being fixed and supported at its ends while the top panel (1) is moving and actuated in a vertical plane by drive members (8a, 8b) situated likewise at its ends, the bottom panel being constituted by a plate having a free top portion (22) and a fixed bottom portion (21) defined by two notches (3a, 3b) that are symmetrically identical to the transverse midplane of said bottom panel, each notch having a top wall (31a, 31b) and a bottom wall (32a, 32b) 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 (3a, 3b) is fitted with a displacement member (6a, 6b) interconnecting the free top portion (22) and the fixed bottom portion (21) 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 said bottom panel in controlled manner. - A bending press according to claim 1, characterized in that each displacement member (6a, 6b) comprises firstly a fixed portion (4a, 4b) connected to the bottom wall (32a, 32b) of the notch and secondly a moving portion (5a, 5b) secured to the top wall (31a, 31b) of the notch.
- A bending press according to claim 1, characterized in that each displacement member (6a, 6b) is situated in the opening of its notch, so as to enable the free ends of the top walls of said notches to be moved accurately.
- A bending press according to any preceding claim, characterized in that it includes a control unit (13) for independently controlling each displacement member as a function of the curve to be given to each end of the free top portion of the bottom panel.
- A bending press according to claim 4, characterized in that the control unit (13) comprises:means (10) for receiving information concerning the curve to be given to the free top portion of the bottom panel; andmeans (11) for converting said curve information into control information for the displacement members (6a, 6b).
- A bending press according to claim 5, characterized in that the control unit further comprises measurement means (7a, 7b) for obtaining information about the actual curve of free top portion of the bottom panel, and the programmed curve.
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)
| Publication Number | Publication Date |
|---|---|
| EP1112130A1 EP1112130A1 (en) | 2001-07-04 |
| EP1112130B1 true EP1112130B1 (en) | 2002-04-10 |
Family
ID=9530251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99941714A Expired - Lifetime EP1112130B1 (en) | 1998-09-09 | 1999-09-08 | Press brake with active lower table |
Country Status (7)
| Country | Link |
|---|---|
| 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) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2004385A (en) * | 2009-03-13 | 2010-09-14 | Amada Europ | A press brake for bending sheets. |
| NL2004386A (en) * | 2009-03-13 | 2010-09-14 | Amada Europ | A press brake for bending sheets. |
| NL2004384A (en) * | 2009-03-13 | 2010-09-14 | Amada Europ | A press brake for bending sheets. |
| NL2004383A (en) * | 2009-03-13 | 2010-09-14 | Amada Europ | A press brake for bending sheets. |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE427830T1 (en) * | 2003-02-26 | 2009-04-15 | Bystronic Laser Ag | METHOD FOR CORRECTING A BENDING PROCESS AND BENDING PRESS |
| EP1697772B9 (en) * | 2003-12-09 | 2009-09-23 | Reflexite Corporation | Method and apparatus for forming an optical structure |
| AT501264B8 (en) * | 2004-09-10 | 2007-02-15 | Trumpf Maschinen Austria Gmbh | METHOD FOR PRODUCING A WORKING PART THROUGH BENDING FORMING |
| NL1029177C2 (en) * | 2005-06-02 | 2006-12-05 | Safan Bv | Bending press, has pressure ram with elastically bendable ends to compensate for ram deformation |
| AT507412B1 (en) * | 2008-10-15 | 2010-05-15 | Trumpf Maschinen Austria Gmbh | BENDING PEG WITH SUPPORT BEARING DEVICE FOR DRIVE AGENTS |
| NL2006854C2 (en) | 2011-05-26 | 2012-12-05 | Wila Bv | METHOD AND DEVICE FOR COMPENSATING DEVIATIONS IN A DEFORMING OPERATION BETWEEN TWO BARS OF A PRESS |
| EP2722164B1 (en) * | 2012-10-18 | 2017-01-18 | Nivora IP B.V. | Spring means for device for working sheet-like material |
| AT514080B1 (en) * | 2013-05-10 | 2014-10-15 | Trumpf Maschinen Austria Gmbh | Apparatus and method for bending sheets |
| DE102014226519A1 (en) * | 2014-12-19 | 2016-06-23 | Sms Group Gmbh | Press tool part and device for eliminating flatness errors on flat semi-finished products |
| US10369613B2 (en) * | 2017-02-06 | 2019-08-06 | GM Global Technology Operations LLC | Die assembly for a stamping press |
| JP6934968B2 (en) * | 2018-02-22 | 2021-09-15 | 株式会社アマダ | Crowning method and press brake in press brake |
| JP6868581B2 (en) * | 2018-02-22 | 2021-05-12 | 株式会社アマダ | Crowning method and press brake in press brake |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3914975A (en) * | 1970-12-25 | 1975-10-28 | Amada Co Ltd | Hydraulic press brake |
| FR2119528A5 (en) * | 1970-12-25 | 1972-08-04 | Amada Co Ltd | |
| DE2317832C3 (en) * | 1973-04-09 | 1978-03-02 | Karl Mengele & Soehne Maschinenfabrik Und Eisengiesserei Guenzburg-Donau, 8870 Guenzburg | Press brake and the like |
| JPS59193718A (en) * | 1983-04-18 | 1984-11-02 | Amada Co Ltd | Controlling method for maintaining parallel between top and bottom dies in press brake |
| US4580434A (en) * | 1983-11-14 | 1986-04-08 | Cincinnati Incorporated | Deflection compensating assembly for a press brake |
| DE4138286A1 (en) * | 1991-11-21 | 1993-05-27 | M & S Brugg Ag | PRESS |
| JP2558928Y2 (en) * | 1991-11-26 | 1998-01-14 | 株式会社アマダ | Press brake |
| JPH0655218A (en) * | 1992-08-07 | 1994-03-01 | Amada Co Ltd | Crowning device for bender |
| DE4235971C1 (en) * | 1992-10-26 | 1994-04-07 | M & S Brugg Ag Brugg | Press brake |
| JP2000343125A (en) * | 1999-05-28 | 2000-12-12 | Amada Co Ltd | Press brake |
| JP2001121214A (en) * | 1999-10-27 | 2001-05-08 | Amada Co Ltd | Press brake crowning device |
-
1998
- 1998-09-09 FR FR9811240A patent/FR2782942B1/en not_active Expired - Fee Related
-
1999
- 1999-09-08 US US09/763,626 patent/US6401512B1/en not_active Expired - Fee Related
- 1999-09-08 WO PCT/FR1999/002131 patent/WO2000013813A1/en active IP Right Grant
- 1999-09-08 EP EP99941714A patent/EP1112130B1/en not_active Expired - Lifetime
- 1999-09-08 DE DE69901261T patent/DE69901261T2/en not_active Expired - Lifetime
- 1999-09-08 AT AT99941714T patent/ATE215854T1/en not_active IP Right Cessation
- 1999-09-08 JP JP2000568605A patent/JP4434493B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2004385A (en) * | 2009-03-13 | 2010-09-14 | Amada Europ | A press brake for bending sheets. |
| NL2004386A (en) * | 2009-03-13 | 2010-09-14 | Amada Europ | A press brake for bending sheets. |
| NL2004384A (en) * | 2009-03-13 | 2010-09-14 | Amada Europ | A press brake for bending sheets. |
| NL2004383A (en) * | 2009-03-13 | 2010-09-14 | Amada Europ | A press brake for bending sheets. |
| FR2942979A1 (en) * | 2009-03-13 | 2010-09-17 | Amada Europ | PRESS BRAKE FOR FOLDING SHEETS |
| FR2942982A1 (en) * | 2009-03-13 | 2010-09-17 | Amada Europ | PRESS BRAKE FOR FOLDING SHEETS |
| FR2942983A1 (en) * | 2009-03-13 | 2010-09-17 | Amada Europ | PRESS BRAKE FOR FOLDING SHEETS |
| FR2942980A1 (en) * | 2009-03-13 | 2010-09-17 | Amada Europ | PRESS BRAKE FOR FOLDING SHEETS |
| FR2942981A1 (en) * | 2009-03-13 | 2010-09-17 | Amada Europ | PRESS BRAKE FOR FOLDING SHEETS |
| DE102010015919A8 (en) * | 2009-03-13 | 2011-02-10 | Amada Europe | Press brake for bending films |
| DE102010015919B4 (en) * | 2009-03-13 | 2016-12-01 | Amada Co., Ltd. | Press brake for bending films |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2782942A1 (en) | 2000-03-10 |
| FR2782942B1 (en) | 2000-12-01 |
| DE69901261T2 (en) | 2002-11-28 |
| JP2002524259A (en) | 2002-08-06 |
| EP1112130A1 (en) | 2001-07-04 |
| JP4434493B2 (en) | 2010-03-17 |
| DE69901261D1 (en) | 2002-05-16 |
| WO2000013813A1 (en) | 2000-03-16 |
| US6401512B1 (en) | 2002-06-11 |
| ATE215854T1 (en) | 2002-04-15 |
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