EP1075880A1 - Press brake with lower beam provided with slots - Google Patents

Press brake with lower beam provided with slots Download PDF

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Publication number
EP1075880A1
EP1075880A1 EP00402207A EP00402207A EP1075880A1 EP 1075880 A1 EP1075880 A1 EP 1075880A1 EP 00402207 A EP00402207 A EP 00402207A EP 00402207 A EP00402207 A EP 00402207A EP 1075880 A1 EP1075880 A1 EP 1075880A1
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EP
European Patent Office
Prior art keywords
plate
press brake
bore
sleeve
deck
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
EP00402207A
Other languages
German (de)
French (fr)
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EP1075880B1 (en
Inventor
Eric Gascoin
Olivier Bouchentouf
Koji Shima
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
Amada Co Ltd
Original Assignee
Amada Europe SA
Amada Co Ltd
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Publication date
Application filed by Amada Europe SA, Amada Co Ltd filed Critical Amada Europe SA
Publication of EP1075880A1 publication Critical patent/EP1075880A1/en
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Publication of EP1075880B1 publication Critical patent/EP1075880B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S72/00—Metal deforming
    • Y10S72/701—Preventing distortion

Definitions

  • the invention relates to a press brake for folding metal sheets of the type having an upper deck arranged above a lower deck, one of these decks being fixed in support on its ends while the other deck is movable and actuated in a vertical plane by drive members also located at its two ends, the fixed apron being constituted by a plate having a demarcated upper part and lower part by two symmetrically identical slots with respect to the plane transverse median of said fixed apron, each slot being defined by an upper wall and a lower wall connected by a bottom, and opening through an opening on the corresponding lateral edge of said plate.
  • Japanese utility model 2,558,928 describes a press brake of this type, in which the working edges of the upper apron and the lower apron deform along lines of curvature longitudinal arched up under the action of bending forces exercised by the drive bodies, and taken up by the supports end of the lower part of the plate.
  • the lateral ends of the part top approach the side ends of the part lower.
  • the upper walls of the slots are near the bottom walls of the slots, and the bottom region of the slots is subject to considerable and repeated stresses which can irreparably degrade the intrinsic elasticity of the upper part of the lower deck.
  • 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 walls lower and upper of the corresponding slot and its displacement virtually limits the depth of said slot and therefore to decrease, as the movable member approaches the opening, the elasticity of the lower deck.
  • This movable member makes it possible to adjust the elasticity of the deck lower depending on the bending forces to be exerted on a part, so that the lines of curvature of the two working edges of the aprons upper and lower are as parallel as possible.
  • each slot is generally formed by a wall curve whose ends are tangentially connected respectively to the upper wall and to the lower wall. If these the latter are substantially parallel, the curved wall is semi-circular, and if they are divergent towards the opening, the curved wall is in the form of a sector less than 180 °.
  • the constraints in the plate are important in the vicinity of this curved connecting surface, and peaks of stress in this area can lead to degradation irreversible and irreversible elasticity of the upper part of the lower apron.
  • the constraints in the bottom area are compression stresses. These constraints can turn into tensile stresses, when the organ mobile is placed near the bottom. These tensile stresses can cause cracks, when the radius of curvature of the bottom is small.
  • the object of the invention is to propose a press brake as mentioned in the introduction which can make a very large number of folding operations without risk of damage irreversible.
  • the invention achieves its object by the fact that the bottom of each slot is formed by the inner wall of a through bore in the plate, said internal wall extending over an angle close to 360 ° to distribute the stresses due to bending over a large area.
  • the zone subjected to strong constraints of the press brake according to the invention is at least equal to double the area of heavy constraints of current press brakes.
  • the point constraints are thus reduced, and there are less chances of obtaining destructive point stress peaks.
  • the safety stops limiting the relative movement of the ends of the upper part relative to the lower part of the lower deck, the bending forces greater than the nominal forces which cause the support of the ends of the upper part on the stops, will not cause additional constraints in the region of background.
  • the plate is reinforced in the region of each bottom by at least one side plywood having a cut following the outline of the bottom and the slot.
  • a plywood is arranged on each side of the plate in the region of each bottom.
  • a sleeve is mounted tightened in each bore, said sleeve being intended to distribute the folding stresses in the regions of the plate surrounding said bore.
  • Figures 1 and 2 show a press brake according to the invention.
  • This press brake has an upper deck 1 and a lower apron 2 mounted in a frame formed by two flanges 9a and 9b joined together, in particular by a bracing beam not shown in the drawing.
  • the upper 1 and lower 2 aprons are contained in a same vertical plane and the upper deck 1 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 bend on the entire length of the fold, it is necessary that this penetration is the even over the entire length.
  • the lower apron 2 is constituted by a plate provided with two slots 3a and 3b symmetrically identical with respect to the plane median transverse of the lower deck 2, represented in FIG. 1 by section line II-II.
  • Each slot 3a and 3b extends substantially in one direction inclined starting from the lower central zone of the plate towards the upper lateral end of the plate.
  • Each slot 3a and 3b is delimited by an upper wall 3 la and 31b and a lower wall 32a and 32b which are substantially parallel to each other, and open out on the lateral face 40a, 40b of the plate through an opening 41a, 41b in which a safety stop 42a, 42b is provided which will be described later.
  • Each slot 3a and 3b further comprises a bottom 33a and 33b which connects the upper walls 3a and 31b and lower 32a and 32b to the level of the central zone of the lower deck 2.
  • 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 apron 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 produced by welding or by any other means.
  • the upper part 22 of the lower deck 2 is, in turn, connected to the lower part 21 only by the central zone of the plate located between the two bottoms 33a and 33b of said slots 3a and 3b.
  • the upper part 22 of the lower deck 2 thus has a degree of freedom in the vertical plane, thanks to which its ends free can be moved vertically from the ends fixed of the lower part 21, when it is subjected to stresses folding, which creates stresses in the plate made of lower deck 2, in particular in the areas around the bottoms 33a and 33b.
  • these latter each consist of the wall internal of a through bore 34a and 34b formed in the plate, said internal wall extending over an angle close to 360 ° and being connected at its ends to two connecting walls 35a and 35b substantially parallel and narrowly spaced, directed towards the center of bore 34a and 34b and connected to curved walls 36a and 36b extending respectively the upper walls 31a and 31b and lower 32a and 32b.
  • the diameter of the bore 34a and 34b is independent of the distance between the upper walls 3a and 31b and lower 32a and 32b. This diameter is dimensioned by calculation and optimized as a result of measurements made using strain gauges.
  • the bores 34a and 34b are machined with precision, so that the state of surface of their internal wall eliminates the risk of crack initiation.
  • the lower part 21 and the upper part 22 of the deck 2 have teeth 37a and 37b, terminated by the connecting walls 35a, 35b spaced by a distance e, and which extend over a length L clearly greater than the distance e.
  • FIGS 4 and 5 show the arrangement of the safety stops 42a and 42b in the openings 41a and 41b of the slots 3a and 3b.
  • Each opening 41a and 41b is delimited by the underside 43a of the lateral end of the upper part 22 of the lower deck 2 and by the upper face 44a of a safety stop 42a and 42b fixed in the upper region of the lateral end of the lower part 21 of the lower deck 2.
  • the faces 43a and 44a are mutually parallel and spaced by a distance J. This distance J decreases when applying bending forces and cancels when the forces reach the force nominal press brake.
  • the stops 42a and 42b directly transmit the overload at the lower part 21 of the lower deck 2, which limits the constraints in the areas of funds 33a and 33b at values of nominal constraints.
  • reinforcements 50a are provided and 50b near funds 33a and 33b.
  • these reinforcements 50a and 50b are in the form of plywoods arranged on either side of the veil of the lower deck 2 and each having a cut following the outline of the bottoms 33a and 33b and slots 3a and 3b.
  • Plywood 50a and 50b are joined to the veil of the lower apron 2 by welding or by any other suitable means.
  • the area annular 51 delimited by a dashed line in FIG. 6, does not include no weld seam, to avoid tensions in this area due to welding.
  • a sleeve 60 is mounted tight in each of these bores, as well as this is shown in Figures 8 to 10.
  • the sleeve 60 has undergone prior to heat treatment and surface treatment aimed at improving its coefficient of friction, in order to avoid any degradation due to the phenomenon of corrosion of the surfaces in contact.
  • FIGS. 11 and 12 show the graph G 1 of the stresses around the bore 34a during a folding operation, in the absence of sleeve 60. This graph G 1 presents a significant stress peak.
  • FIG. 13 shows the graph G 2 of the stresses when the bore 34a comprises a sleeve 60.
  • the sleeve 60 can be made in full or hollow section. In the case where the veil of the lower apron 2 is reinforced by plywoods 50a and 50b, the sleeve 60 is tightened both in the bore 34a and 34b and in the corresponding openings of the plywoods 50a and 50b.
  • the sleeve 60 shown in Figures 9 and 10 is cylindrical and has a diameter adapted to that of the bores 34a and 34b. But the difference in precision of the diameter of the bores 34a and 34b and of the sleeve diameter 60 may affect the accuracy of folding.
  • FIG. 14 shows an alternative embodiment of the sleeve 60.
  • the bores 34a, 34b and the sleeve 60 are machined so that they have a conical shape with the same inclination.
  • the sleeve 60 is held in its bore by a plate 61 fixed by bolts 62 on one side of the deck around the most large opening of the bore.
  • a plate 63 made of material elastic, such as polyurethane, is interposed between the plate 61 and the end face of the sleeve 60. This plate 63 made of material elastic also eliminates the play between the sleeve 60 and the inner wall of the bore.
  • the apron lower is fixed and the upper deck is movable.
  • the invention is not not limit to these embodiments and also relates to press brakes in which the upper deck is fixed and the lower deck is movable.
  • the slots 3a and 3b are formed in the fixed upper apron.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Forging (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

The sheet metal folding press has a movable punch (1) and a fixed die (2) which has two open grooves on its die faces. The base of each grove is formed by the inner wall (33a,b) of a bore machined in the lower die. The bore wall extends for an angle close to three hundred and sixty degrees to diffuse the loads due to flexure over a wide zone. A security stop (42a,b) is provided in the opening of each groove.

Description

L'invention concerne une presse plieuse pour le pliage de feuilles métalliques du type comportant un tablier supérieur disposé au-dessus d'un tablier inférieur, l'un de ces tabliers étant fixe en appui sur ses extrémités tandis que l'autre tablier est mobile et actionné dans un plan vertical par des organes d'entraínement situés également à ses deux extrémités, le tablier fixe étant constitué par une plaque comportant une partie supérieure et une partie inférieure délimitées par deux fentes symétriquement identiques par rapport au plan transversal médian dudit tablier fixe, chaque fente étant définie par une paroi supérieure et une paroi inférieure raccordées par un fond, et débouchant par une ouverture sur le bord latéral correspondant de ladite plaque.The invention relates to a press brake for folding metal sheets of the type having an upper deck arranged above a lower deck, one of these decks being fixed in support on its ends while the other deck is movable and actuated in a vertical plane by drive members also located at its two ends, the fixed apron being constituted by a plate having a demarcated upper part and lower part by two symmetrically identical slots with respect to the plane transverse median of said fixed apron, each slot being defined by an upper wall and a lower wall connected by a bottom, and opening through an opening on the corresponding lateral edge of said plate.

Le modèle d'utilité japonais 2 558 928 décrit une presse plieuse de ce type, dans laquelle les bords de travail du tablier supérieur et du tablier inférieur se déforment selon des lignes de courbures longitudinales arquées vers le haut sous l'action des efforts de pliage exercés par les organes d'entraínement, et repris par les appuis d'extrémité de la partie inférieure de la plaque. Au cours de l'application des efforts de pliage, les extrémités latérales de la partie supérieure se rapprochent des extrémités latérales de la partie inférieure. Autrement dit, les parois supérieures des fentes se rapprochent des parois inférieures des fentes, et la région du fond des fentes est soumise à des contraintes considérables et répétées qui peuvent dégrader de manière irrémédiable l'élasticité intrinsèque de la partie supérieure du tablier inférieur.Japanese utility model 2,558,928 describes a press brake of this type, in which the working edges of the upper apron and the lower apron deform along lines of curvature longitudinal arched up under the action of bending forces exercised by the drive bodies, and taken up by the supports end of the lower part of the plate. During the application of the bending forces, the lateral ends of the part top approach the side ends of the part lower. In other words, the upper walls of the slots are near the bottom walls of the slots, and the bottom region of the slots is subject to considerable and repeated stresses which can irreparably degrade the intrinsic elasticity of the upper part of the lower deck.

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 la fente correspondante et son déplacement permet de limiter virtuellement la profondeur de ladite fente et donc de diminuer, au fur et à mesure que l'organe mobile se rapproche de l'ouverture, 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 movable member is directly in contact with the walls lower and upper of the corresponding slot and its displacement virtually limits the depth of said slot and therefore to decrease, as the movable member approaches the opening, the elasticity of the lower deck.

Cet organe mobile permet de régler l'élasticité du tablier inférieur selon les efforts de pliage à exercer sur une pièce, afin que les lignes de courbures des deux bords de travail des tabliers supérieur et inférieur soient aussi parallèles que possible.This movable member makes it possible to adjust the elasticity of the deck lower depending on the bending forces to be exerted on a part, so that the lines of curvature of the two working edges of the aprons upper and lower are as parallel as possible.

Le fond de chaque fente est en général constitué par une paroi courbe dont les extrémités se raccordent tangentiellement respectivement à la paroi supérieure et à la paroi inférieure. Si ces dernières sont sensiblement parallèles, la paroi courbe est semi-circulaire, et si elles sont divergentes vers l'ouverture, la paroi courbe se présente sous la forme d'un secteur inférieur à 180°. Les contraintes dans la plaque sont importantes dans les environs immédiats de cette surface courbe de raccordement, et des pics de contrainte dans cette zone peuvent entraíner une dégradation irrémédiable et irréversible de l'élasticité de la partie supérieure du tablier inférieur. En l'absence d'organe mobile, les contraintes dans la zone du fond sont des contraintes de compression. Ces contraintes peuvent se transformer en contraintes de traction, lorsque l'organe mobile est placé près du fond. Ces contraintes de traction peuvent entraíner des fissures, lorsque le rayon de courbure du fond est faible.The bottom of each slot is generally formed by a wall curve whose ends are tangentially connected respectively to the upper wall and to the lower wall. If these the latter are substantially parallel, the curved wall is semi-circular, and if they are divergent towards the opening, the curved wall is in the form of a sector less than 180 °. The constraints in the plate are important in the vicinity of this curved connecting surface, and peaks of stress in this area can lead to degradation irreversible and irreversible elasticity of the upper part of the lower apron. In the absence of a mobile organ, the constraints in the bottom area are compression stresses. These constraints can turn into tensile stresses, when the organ mobile is placed near the bottom. These tensile stresses can cause cracks, when the radius of curvature of the bottom is small.

L'invention s'est donné pour but de proposer une presse plieuse telle que mentionnée en introduction qui puisse effectuer un très grand nombre d'opérations de pliage sans risque de dommage irréversible.The object of the invention is to propose a press brake as mentioned in the introduction which can make a very large number of folding operations without risk of damage irreversible.

L'invention atteint son but par le fait que le fond de chaque fente est formé par la paroi interne d'un alésage traversant ménagé dans la plaque, ladite paroi interne s'étendant sur un angle voisin de 360° afin de répartir les contraintes dues à la flexion sur une plus grande zone.The invention achieves its object by the fact that the bottom of each slot is formed by the inner wall of a through bore in the plate, said internal wall extending over an angle close to 360 ° to distribute the stresses due to bending over a large area.

A courbure égale du fond, la zone soumise aux fortes contraintes de la presse plieuse selon l'invention est au moins égale au double de la zone de fortes contraintes des presses plieuses actuelles. Les contraintes ponctuelles sont ainsi diminuées, et il y a moins de chances d'obtenir des pics de contraintes ponctuelles destructeurs. Les butées de sécurité limitant le déplacement relatif des extrémités de la partie supérieure par rapport à la partie inférieure du tablier inférieur, les forces de pliage supérieures aux forces nominales qui entraínent l'appui des extrémités de la partie supérieure sur les butées, n'entraíneront pas de contraintes supplémentaires dans la région du fond.With an equal curvature of the bottom, the zone subjected to strong constraints of the press brake according to the invention is at least equal to double the area of heavy constraints of current press brakes. The point constraints are thus reduced, and there are less chances of obtaining destructive point stress peaks. The safety stops limiting the relative movement of the ends of the upper part relative to the lower part of the lower deck, the bending forces greater than the nominal forces which cause the support of the ends of the upper part on the stops, will not cause additional constraints in the region of background.

Selon une autre caractéristique la plaque est renforcée dans la région de chaque fond par au moins une contreplaque latérale présentant une découpe épousant le contour du fond et de la fente.According to another characteristic, the plate is reinforced in the region of each bottom by at least one side plywood having a cut following the outline of the bottom and the slot.

Avantageusement, une contreplaque est disposée de chaque côté de la plaque dans la région de chaque fond.Advantageously, a plywood is arranged on each side of the plate in the region of each bottom.

Selon encore une autre caractéristique un manchon est monté serré dans chaque alésage, ledit manchon étant destiné à répartir les contraintes de pliage dans les régions de la plaque entourant ledit alésage.According to yet another characteristic, a sleeve is mounted tightened in each bore, said sleeve being intended to distribute the folding stresses in the regions of the plate surrounding said bore.

D'autres avantages et caractéristiques de l'invention ressortiront à la lecture de la description suivante faite à titre d'exemple et en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue de face d'une presse plieuse selon l'invention ;
  • la figure 2 est une vue en coupe verticale selon la ligne II-II de la figure 1 ;
  • la figure 3 montre à plus grande échelle la configuration du fond d'une fente de la presse plieuse de la figure 1 ;
  • la figure 4 montre à plus grande échelle la configuration de l'ouverture d'une fente, la presse plieuse étant au repos ;
  • la figure 5 montre la disposition de la butée de sécurité lorsque les efforts de pliage sont supérieurs à la force nominale de la presse plieuse ;
  • la figure 6 est une vue latérale d'un fond de fente équipé d'une contreplaque ;
  • la figure 7 est une coupe selon la ligne VII-VII de la figure 6 ;
  • la figure 8 est une vue latérale d'un fond de fente équipé d'un manchon répartiteur de contraintes ;
  • les figures 9 et 10 sont des coupes selon la ligne IX-IX de la figure 8 ;
  • la figure 11 montre le graphique des contraintes autour d'un fond au cours d'une opération de pliage ;
  • la figure 12 montre à plus grande échelle le graphique des contraintes ;
  • la figure 13 est semblable à la figure 12 et montre le graphique des contraintes lorsque le fond de fente est équipé d'un manchon ; et
  • la figure 14 montre une variante de réalisation du manchon répartiteur de contraintes.
    • Other advantages and characteristics of the invention will emerge on reading the following description given by way of example and with reference to the appended drawings in which:
  • Figure 1 is a front view of a press brake according to the invention;
  • Figure 2 is a vertical sectional view along line II-II of Figure 1;
  • Figure 3 shows on a larger scale the configuration of the bottom of a slot of the press brake of Figure 1;
  • Figure 4 shows on a larger scale the configuration of the opening of a slot, the press brake being at rest;
  • FIG. 5 shows the arrangement of the safety stop when the bending forces are greater than the nominal force of the press brake;
  • Figure 6 is a side view of a slot bottom fitted with a backing plate;
  • Figure 7 is a section along the line VII-VII of Figure 6;
  • Figure 8 is a side view of a slot bottom equipped with a stress distributor sleeve;
  • Figures 9 and 10 are sections along the line IX-IX of Figure 8;
  • FIG. 11 shows the graph of the stresses around a bottom during a folding operation;
  • Figure 12 shows on a larger scale the stress graph;
  • Figure 13 is similar to Figure 12 and shows the stress graph when the slot bottom is equipped with a sleeve; and
  • Figure 14 shows an alternative embodiment of the stress distributor sleeve.

    • 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 comporte 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 sur le dessin.This press brake has an upper deck 1 and a lower apron 2 mounted in a frame formed by two flanges 9a and 9b joined together, in particular by a bracing beam not shown in the drawing.

    Les tabliers supérieur 1 et inférieur 2 sont contenus dans un même plan vertical et le tablier supérieur 1 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 deck 1 slides in relation to flanges 9a and 9b using guide means 8a and 8b constituted by 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.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 la 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 bend on the entire length of the fold, it is necessary that this penetration is the even over the 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 2, représenté sur la figure 1 par la ligne de coupe II-II.The lower apron 2 is constituted by a plate provided with two slots 3a and 3b symmetrically identical with respect to the plane median transverse of the lower deck 2, represented in FIG. 1 by section line II-II.

    Chaque fente 3a et 3b s'étend sensiblement dans une direction inclinée partant de la zone médiane inférieure de la plaque vers l'extrémité supérieure latérale de la plaque. Chaque fente 3a et 3b est délimitée par une paroi supérieure 3 la et 31b et une paroi inférieure 32a et 32b qui sont sensiblement parallèles entre elles, et débouchent sur la face latérale 40a, 40b de la plaque par une ouverture 41a, 41b dans laquelle est prévue une butée de sécurité 42a, 42b qui sera décrite plus loin. Each slot 3a and 3b extends substantially in one direction inclined starting from the lower central zone of the plate towards the upper lateral end of the plate. Each slot 3a and 3b is delimited by an upper wall 3 la and 31b and a lower wall 32a and 32b which are substantially parallel to each other, and open out on the lateral face 40a, 40b of the plate through an opening 41a, 41b in which a safety stop 42a, 42b is provided which will be described later.

    Chaque fente 3a et 3b comporte en outre un fond 33a et 33b qui raccorde les parois supérieure 3 la et 31b et inférieure 32a et 32b au niveau de la zone centrale du tablier inférieur 2.Each slot 3a and 3b further comprises a bottom 33a and 33b which connects the upper walls 3a and 31b and lower 32a and 32b to the level of the central zone of the lower deck 2.

    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 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.

    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. La fixation de la partie inférieure 21 peut être réalisée par soudure ou par tout autre moyen.As can be seen in FIG. 2, the lower part 21 of the lower apron 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 produced by welding or by any other means.

    La partie supérieure 22 du tablier inférieur 2 est, quant à elle, reliée à la partie inférieure 21 uniquement par la zone centrale de la plaque située entre les deux fonds 33a et 33b desdites fentes 3a et 3b.The upper part 22 of the lower deck 2 is, in turn, connected to the lower part 21 only by the central zone of the plate located between the two bottoms 33a and 33b of said slots 3a and 3b.

    La partie supérieure 22 du tablier inférieur 2 possède ainsi un degré de liberté dans le plan vertical, grâce à quoi ses extrémités libres peuvent être déplacées verticalement par rapport aux extrémités fixes de la partie inférieure 21, lorsqu'elle est soumise à des efforts de pliage, ce qui engendre des contraintes dans la plaque constituée du tablier inférieur 2, notamment dans les zones avoisinant les fonds 33a et 33b.The upper part 22 of the lower deck 2 thus has a degree of freedom in the vertical plane, thanks to which its ends free can be moved vertically from the ends fixed of the lower part 21, when it is subjected to stresses folding, which creates stresses in the plate made of lower deck 2, in particular in the areas around the bottoms 33a and 33b.

    Afin d'augmenter l'étendue de la zone avoisinant chacun des fonds 33a et 33b, ces derniers sont constitués chacun par la paroi interne d'un alésage traversant 34a et 34b ménagé dans la plaque, ladite paroi interne s'étendant sur un angle proche de 360° et étant raccordée à ses extrémités à deux parois de liaison 35a et 35b sensiblement parallèles et faiblement espacées, dirigées vers le centre de l'alésage 34a et 34b et raccordées à des parois courbes 36a et 36b prolongeant respectivement les parois supérieure 31a et 31b et inférieure 32a et 32b.In order to increase the extent of the area surrounding each of the bottoms 33a and 33b, these latter each consist of the wall internal of a through bore 34a and 34b formed in the plate, said internal wall extending over an angle close to 360 ° and being connected at its ends to two connecting walls 35a and 35b substantially parallel and narrowly spaced, directed towards the center of bore 34a and 34b and connected to curved walls 36a and 36b extending respectively the upper walls 31a and 31b and lower 32a and 32b.

    Le diamètre de l'alésage 34a et 34b est indépendant de la distance séparant les parois supérieure 3 la et 31b et inférieure 32a et 32b. Ce diamètre est dimensionné par le calcul et optimisé à la suite de mesures effectuées au moyen de jauges de contrainte. Les alésages 34a et 34b sont usinés avec précision, de telle manière que l'état de surface de leur paroi interne élimine les risques d'amorçage de fissure. The diameter of the bore 34a and 34b is independent of the distance between the upper walls 3a and 31b and lower 32a and 32b. This diameter is dimensioned by calculation and optimized as a result of measurements made using strain gauges. The bores 34a and 34b are machined with precision, so that the state of surface of their internal wall eliminates the risk of crack initiation.

    Ainsi que cela est montré sur la figure 3, la partie inférieure 21 et la partie supérieure 22 du tablier 2 présentent des dents 37a et 37b, terminées par les parois de liaison 35a, 35b espacées d'une distance e, et qui s'étendent sur une longueur L nettement supérieure à la distance e.As shown in Figure 3, the lower part 21 and the upper part 22 of the deck 2 have teeth 37a and 37b, terminated by the connecting walls 35a, 35b spaced by a distance e, and which extend over a length L clearly greater than the distance e.

    Les figures 4 et 5 montrent la disposition des butées de sécurité 42a et 42b dans les ouvertures 41a et 41b des fentes 3a et 3b. Chaque ouverture 41a et 41b est délimitée par la face inférieure 43a de l'extrémité latérale de la partie supérieure 22 du tablier inférieur 2 et par la face supérieure 44a d'une butée de sécurité 42a et 42b fixée dans la région supérieure de l'extrémité latérale de la partie inférieure 21 du tablier inférieur 2. Au repos, c'est-à-dire en l'absence d'efforts de pliage, les faces 43a et 44a sont parallèles entre elles et espacées d'une distance J. Cette distance J diminue lorsqu'on applique des efforts de pliage et s'annule lorsque les efforts atteignent la force nominale de la presse plieuse. Lorsque les efforts sont supérieurs à cette force nominale, les butées 42a et 42b transmettent directement la surcharge à la partie inférieure 21 du tablier inférieur 2, ce qui limite les contraintes dans les zones des fonds 33a et 33b à des valeurs de contraintes nominales.Figures 4 and 5 show the arrangement of the safety stops 42a and 42b in the openings 41a and 41b of the slots 3a and 3b. Each opening 41a and 41b is delimited by the underside 43a of the lateral end of the upper part 22 of the lower deck 2 and by the upper face 44a of a safety stop 42a and 42b fixed in the upper region of the lateral end of the lower part 21 of the lower deck 2. At rest, that is to say in the absence of efforts folding, the faces 43a and 44a are mutually parallel and spaced by a distance J. This distance J decreases when applying bending forces and cancels when the forces reach the force nominal press brake. When the efforts are greater than this nominal force, the stops 42a and 42b directly transmit the overload at the lower part 21 of the lower deck 2, which limits the constraints in the areas of funds 33a and 33b at values of nominal constraints.

    Afin de répartir les contraintes dans les zones des fonds 33a et 33b sur un plus grand volume de matière, il est prévu des renforts 50a et 50b près des fonds 33a et 33b. Ainsi que cela est montré sur les figures 6 et 7, ces renforts 50a et 50b se présentent sous la forme de contreplaques disposées de part et d'autre du voile du tablier inférieur 2 et qui présentent chacune une découpe épousant le contour des fonds 33a et 33b et des fentes 3a et 3b. Les contreplaques 50a et 50b sont solidarisées au voile du tablier inférieur 2 par soudure ou par tout autre moyen adapté. Dans le cas d'un assemblage par soudure, la zone annulaire 51, délimitée par un trait mixte sur la figure 6, ne comporte pas de cordon de soudure, afin d'éviter dans cette zone les tensions dues à la soudure.In order to distribute the constraints in the areas of funds 33a and 33b on a larger volume of material, reinforcements 50a are provided and 50b near funds 33a and 33b. As shown on Figures 6 and 7, these reinforcements 50a and 50b are in the form of plywoods arranged on either side of the veil of the lower deck 2 and each having a cut following the outline of the bottoms 33a and 33b and slots 3a and 3b. Plywood 50a and 50b are joined to the veil of the lower apron 2 by welding or by any other suitable means. In the case of a welded joint, the area annular 51, delimited by a dashed line in FIG. 6, does not include no weld seam, to avoid tensions in this area due to welding.

    Selon une autre caractéristique de l'invention, et afin de répartir plus uniformément les contraintes autour des alésages 34a et 34b, un manchon 60 est monté serré dans chacun de ces alésages, ainsi que cela est montré sur les figures 8 à 10. Le manchon 60 a subi préalablement un traitement thermique et un traitement de surface visant à améliorer son coefficient de frottement, afin d'éviter toute dégradation due au phénomène de corrosion des faces en contact.According to another characteristic of the invention, and in order to distribute more uniformly the stresses around bores 34a and 34b, a sleeve 60 is mounted tight in each of these bores, as well as this is shown in Figures 8 to 10. The sleeve 60 has undergone prior to heat treatment and surface treatment aimed at improving its coefficient of friction, in order to avoid any degradation due to the phenomenon of corrosion of the surfaces in contact.

    Les figures 11 et 12 montrent le graphique G1 des contraintes autour de l'alésage 34a lors d'une opération de pliage, en l'absence de manchon 60. Ce graphique G1 présente un pic de contrainte important. La figure 13 montre le graphique G2 des contraintes lorsque l'alésage 34a comporte un manchon 60.FIGS. 11 and 12 show the graph G 1 of the stresses around the bore 34a during a folding operation, in the absence of sleeve 60. This graph G 1 presents a significant stress peak. FIG. 13 shows the graph G 2 of the stresses when the bore 34a comprises a sleeve 60.

    Le manchon 60 peut être réalisé en section pleine ou creuse. Dans le cas où le voile du tablier inférieur 2 est renforcé par des contreplaques 50a et 50b, le manchon 60 est serré à la fois dans l'alésage 34a et 34b et dans les ouvertures correspondantes des contreplaques 50a et 50b.The sleeve 60 can be made in full or hollow section. In the case where the veil of the lower apron 2 is reinforced by plywoods 50a and 50b, the sleeve 60 is tightened both in the bore 34a and 34b and in the corresponding openings of the plywoods 50a and 50b.

    Le manchon 60 montré sur les figures 9 et 10 est cylindrique et a un diamètre adapté à celui des alésages 34a et 34b. Mais la différence de précision du diamètre des alésages 34a et 34b et du diamètre du manchon 60 peut affecter la précision du pliage.The sleeve 60 shown in Figures 9 and 10 is cylindrical and has a diameter adapted to that of the bores 34a and 34b. But the difference in precision of the diameter of the bores 34a and 34b and of the sleeve diameter 60 may affect the accuracy of folding.

    Pour remédier à cette situation, on pourrait procéder à l'insertion à froid du manchon 60. Mais cette opération entraínerait une augmentation du prix de revient, dû à l'usinage plus complexe du tablier.To remedy this situation, one could proceed cold insertion of the sleeve 60. But this operation would cause an increase in the cost price, due to the more complex machining of the apron.

    La figure 14 montre une variante de réalisation du manchon 60. Les alésages 34a, 34b et le manchon 60 sont usinés afin qu'ils aient une forme conique avec une même inclinaison.FIG. 14 shows an alternative embodiment of the sleeve 60. The bores 34a, 34b and the sleeve 60 are machined so that they have a conical shape with the same inclination.

    Le manchon 60 est maintenu dans son alésage par une plaque 61 fixée par des boulons 62 sur une face du tablier autour de la plus grande ouverture de l'alésage. Une plaquette 63, en matériau élastique, telle que du polyuréthanne, est interposée entre la plaque 61 et la face d'extrémité du manchon 60. Cette plaquette 63 en matériau élastique permet en outre d'éliminer le jeu entre le manchon 60 et la paroi interne de l'alésage.The sleeve 60 is held in its bore by a plate 61 fixed by bolts 62 on one side of the deck around the most large opening of the bore. A plate 63, made of material elastic, such as polyurethane, is interposed between the plate 61 and the end face of the sleeve 60. This plate 63 made of material elastic also eliminates the play between the sleeve 60 and the inner wall of the bore.

    Dans les modes de réalisation décrits ci-dessus, le tablier inférieur est fixe et le tablier supérieur est mobile. L'invention ne se limite pas à ces modes de réalisation et concerne également les presses plieuses dans lesquelles le tablier supérieur est fixe et le tablier inférieur est mobile. Dans ce cas les fentes 3a et 3b sont ménagées dans le tablier supérieur fixe.In the embodiments described above, the apron lower is fixed and the upper deck is movable. The invention is not not limit to these embodiments and also relates to press brakes in which the upper deck is fixed and the lower deck is movable. In this case the slots 3a and 3b are formed in the fixed upper apron.

    Claims (7)

    Presse plieuse pour le pliage de feuilles métalliques, du type comportant un tablier supérieur (1) disposé au-dessus d'un tablier inférieur (2), l'un des tabliers (2) étant fixe en appui à ses extrémités, tandis que l'autre tablier (1) est mobile et actionné dans un plan vertical par des organes d'entraínement (8a, 8b) situés également à ses extrémités, le tablier fixe (2) étant constitué par une plaque comportant une partie supérieure (22) et une partie inférieure (21) délimitées par deux fentes symétriquement identiques par rapport au plan transversal médian dudit tablier fixe (2), chaque fente (3a, 3b) étant définie par une paroi supérieure (31a, 31b) et une paroi inférieure (32a, 32b) raccordées par un fond (33a, 33b) et débouchant par une ouverture (41a, 41b) sur le bord latéral correspondant de ladite plaque,
    caractérisée par le fait que le fond (33a, 33b) de chaque fente (3a, 3b) est formé par la paroi interne d'un alésage (34a, 34b) traversant ménagé dans la plaque, ladite paroi interne s'étendant sur un angle proche de 360° afin de répartir les contraintes dues à la flexion sur une plus grande zone.    Press brake for folding metal sheets, of the type comprising an upper deck (1) disposed above a lower deck (2), one of the decks (2) being fixed in abutment at its ends, while the 'other deck (1) is movable and actuated in a vertical plane by drive members (8a, 8b) also located at its ends, the fixed deck (2) being constituted by a plate having an upper part (22) and a lower part (21) delimited by two slots symmetrically identical with respect to the median transverse plane of said fixed apron (2), each slot (3a, 3b) being defined by an upper wall (31a, 31b) and a lower wall (32a, 32b) connected by a bottom (33a, 33b) and opening out through an opening (41a, 41b) on the corresponding lateral edge of said plate,
    characterized in that the bottom (33a, 33b) of each slot (3a, 3b) is formed by the internal wall of a through bore (34a, 34b) formed in the plate, said internal wall extending over an angle close to 360 ° in order to distribute the stresses due to bending over a larger area.         Presse plieuse selon la revendication 1, caractérisée par le fait que la paroi supérieure (31a, 31b) et la paroi inférieure (32a, 32b) sont sensiblement parallèles et se raccordent par des parois courbes (36a, 36b) à deux parois de liaison (35a, 35b) sensiblement parallèles et faiblement espacées, lesdites deux parois de liaison (35a, 35b) étant dirigées vers le centre de l'alésage (34a, 34b) et étant raccordées respectivement aux extrémités de la paroi interne de l'alésage (34a, 34b).Press brake according to claim 1, characterized in that that the upper wall (31a, 31b) and the lower wall (32a, 32b) are substantially parallel and are connected by curved walls (36a, 36b) with two substantially parallel connecting walls (35a, 35b) and spaced apart, said two connecting walls (35a, 35b) being directed towards the center of the bore (34a, 34b) and being connected respectively at the ends of the internal wall of the bore (34a, 34b). Presse plieuse selon l'une des revendications 1 ou 2, caractérisée par le fait que la plaque est renforcée dans la région de chaque fond (33a, 33b) par au moins une contreplaque (50a, 50b) latérale présentant une découpe épousant le contour du fond (33a, 33b) et de la fente (3a, 3b).Press brake according to one of claims 1 or 2, characterized in that the plate is reinforced in the region of each bottom (33a, 33b) by at least one plywood (50a, 50b) side having a cut following the contour of the bottom (33a, 33b) and the slot (3a, 3b). Presse plieuse selon la revendication 3, caractérisée par le fait qu'une contreplaque (50a, 50b) est disposée de chaque côté de la plaque dans la région de chaque fond (33a, 33b). Press brake according to claim 3, characterized in that that a plywood (50a, 50b) is arranged on each side of the plate in the region of each bottom (33a, 33b). Presse plieuse selon l'une quelconque des revendications 1 à 4, caractérisée par le fait qu'un manchon (60) est monté serré dans chaque alésage (34a, 34b), ledit manchon (60) étant destiné à répartir les contraintes de pliage dans les régions de la plaque entourant ledit alésage (34a, 34b).Press brake according to any one of claims 1 to 4, characterized in that a sleeve (60) is mounted tight in each bore (34a, 34b), said sleeve (60) being intended to distribute the folding stresses in the regions of the plate surrounding said bore (34a, 34b). Presse plieuse selon la revendication 5, caractérisée par le fait que le manchon (60) et les alésages (34a, 34b) ont une forme conique avec la même inclinaison.Press brake according to claim 5, characterized in that that the sleeve (60) and the bores (34a, 34b) have a conical shape with the same tilt. Presse plieuse selon la revendication 6, caractérisée par le fait que le manchon (60) est maintenu dans son alésage (34a, 34b) par une plaque (61) avec interposition d'une plaquette (63) en matériau élastique.Press brake according to claim 6, characterized in that that the sleeve (60) is held in its bore (34a, 34b) by a plate (61) with interposition of a plate (63) of material elastic.
    EP00402207A 1999-08-09 2000-08-02 Press brake with lower beam provided with slots Expired - Lifetime EP1075880B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9910315A FR2797407B1 (en) 1999-08-09 1999-08-09 LOWER APRON PRESS WITH SLOTS
    FR9910315 1999-08-09

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    EP1075880A1 true EP1075880A1 (en) 2001-02-14
    EP1075880B1 EP1075880B1 (en) 2003-10-08

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    US (1) US6374658B1 (en)
    EP (1) EP1075880B1 (en)
    JP (1) JP4676593B2 (en)
    AT (1) ATE251510T1 (en)
    DE (1) DE60005763T2 (en)
    FR (1) FR2797407B1 (en)

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    WO2001043896A1 (en) * 1999-12-15 2001-06-21 Trumpf Maschinen Austria Gmbh & Co. Kg. Manufacturing device, especially a folding press
    CN101837393A (en) * 2009-03-13 2010-09-22 阿玛达欧洲公司 The bullodozer that is used for bending sheets
    AT514080B1 (en) * 2013-05-10 2014-10-15 Trumpf Maschinen Austria Gmbh Apparatus and method for bending sheets
    WO2015081359A1 (en) * 2013-12-04 2015-06-11 Trumpf Maschinen Austria Gmbh & Co. Kg. Bending machine

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    ITTO20020904A1 (en) * 2002-10-17 2004-04-18 Alberto Arduino BENDING PRESS WITH TOOL BEARING SUBSTANTIALLY
    JP4630533B2 (en) * 2002-10-23 2011-02-09 株式会社アマダ Bending machine
    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
    FR2942981B1 (en) * 2009-03-13 2011-04-08 Amada Europe PRESS BRAKE FOR FOLDING SHEETS
    FR2942982B1 (en) * 2009-03-13 2014-12-05 Amada Europ PRESS BRAKE FOR FOLDING SHEETS
    ITMI20110977A1 (en) 2011-05-30 2012-12-01 Finn Power Italia S R L FOLDING PRESS
    JP6058428B2 (en) * 2013-03-04 2017-01-11 大生熔接工業株式会社 Strengthening method for mold mounting members
    JP7369636B2 (en) * 2020-02-17 2023-10-26 株式会社アマダ Press brake and bending method
    EP4074432A1 (en) * 2021-04-15 2022-10-19 Bystronic Laser AG Bending machine for bending workpieces, in particular bending press

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    Cited By (9)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2001043896A1 (en) * 1999-12-15 2001-06-21 Trumpf Maschinen Austria Gmbh & Co. Kg. Manufacturing device, especially a folding press
    CN101837393A (en) * 2009-03-13 2010-09-22 阿玛达欧洲公司 The bullodozer that is used for bending sheets
    ES2382287A1 (en) * 2009-03-13 2012-06-07 Amada Europe Press brake for bending sheets
    CN101837393B (en) * 2009-03-13 2012-11-14 株式会社天田 Press brake for bending sheets
    CN102861795A (en) * 2009-03-13 2013-01-09 株式会社天田 Press brake for bending sheets
    CN102861795B (en) * 2009-03-13 2014-12-03 株式会社天田 Press brake for bending sheets
    AT514080B1 (en) * 2013-05-10 2014-10-15 Trumpf Maschinen Austria Gmbh Apparatus and method for bending sheets
    AT514080A4 (en) * 2013-05-10 2014-10-15 Trumpf Maschinen Austria Gmbh Apparatus and method for bending sheets
    WO2015081359A1 (en) * 2013-12-04 2015-06-11 Trumpf Maschinen Austria Gmbh & Co. Kg. Bending machine

    Also Published As

    Publication number Publication date
    JP2001071033A (en) 2001-03-21
    FR2797407A1 (en) 2001-02-16
    FR2797407B1 (en) 2001-11-02
    US6374658B1 (en) 2002-04-23
    JP4676593B2 (en) 2011-04-27
    ATE251510T1 (en) 2003-10-15
    DE60005763D1 (en) 2003-11-13
    EP1075880B1 (en) 2003-10-08
    DE60005763T2 (en) 2004-08-05

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