EP0089904B1 - Flat bending device - Google Patents

Flat bending device Download PDF

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Publication number
EP0089904B1
EP0089904B1 EP83420042A EP83420042A EP0089904B1 EP 0089904 B1 EP0089904 B1 EP 0089904B1 EP 83420042 A EP83420042 A EP 83420042A EP 83420042 A EP83420042 A EP 83420042A EP 0089904 B1 EP0089904 B1 EP 0089904B1
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EP
European Patent Office
Prior art keywords
blade
movable
edge
travel
bending
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
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EP83420042A
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German (de)
French (fr)
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EP0089904A1 (en
Inventor
Alexis Pauzin
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Individual
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Individual
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Publication date
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Priority to AT83420042T priority Critical patent/ATE17449T1/en
Publication of EP0089904A1 publication Critical patent/EP0089904A1/en
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Publication of EP0089904B1 publication Critical patent/EP0089904B1/en
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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
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/045—With a wiping movement of the bending blade
    • 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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws

Definitions

  • the present invention relates to a flat folding tool, that is to say of the type comprising a fixed blade having a horizontal surface, one edge of which constitutes the folding line, and an assembly movable in the direction of the above-mentioned horizontal surface of the fixed blade and comprising, essentially, a blank holder linked elastically to the mobile assembly and adapted to be applied against the sheet previously placed against the horizontal surface of the fixed blade to ensure its maintenance before the start of the stroke fraction of the movable assembly corresponding to the folding and a movable blade intended to be moved transversely along the edge of the horizontal surface of the fixed blade along which the folding is carried out.
  • US Pat. No. 3,058,512 discloses a flat folding device of the aforementioned type, that is to say comprising a fixed blade having a horizontal surface of which one edge constitutes the fold line and an assembly movable in the direction of the fixed blade. and essentially comprising a blank clamp connected elastically to the mobile assembly and capable of being applied against the sheet to be folded previously placed against the horizontal surface of the fixed blade to ensure its maintenance before the start of the fraction of travel of the assembly mobile corresponding to the folding and a mobile blade intended to be moved transversely along the edge of the horizontal surface along which the folding is carried out, each blade having, on its lateral face opposite the other blade at the end of the transverse stroke of the movable blade a step of release.
  • the movable blade is pivotally mounted about an axis parallel to the fold line and means are provided to cause the pivoting blade to pivot towards the fixed blade after it has reached its end of travel. transverse and thus allow the continued folding of the head at an angle less than 90 °, this folding angle being determined by the value of the travel in translation and / or rotation of the movable blade.
  • the movable blade is carried by articulated levers making this device very complex, long and delicate assembly and costly maintenance. Furthermore, in this device, the amplitude of movement of the movable blade and, consequently, the folding angle which it achieves, are determined by a cam and can therefore only be modified by a change of cam. This device is therefore not very flexible to use and, therefore, is only intended for a specific type of folding, carried out in large series.
  • the movable blade is carried by a movable support or blade holder to which it is articulated and which is slidably mounted in the sheath-shaped body of the mobile assembly, between two extreme positions, elastic means tending to move this support in the direction of the fixed blade, at least until the start of the pivoting stroke of the movable blade and the means for causing it to pivot consist of a inclined face forming a ramp provided along the free edge of the lateral face of the movable blade opposite to that facing the fixed blade and by a complementary tilt shoe carried by the body of the mobile assembly and against which the aforementioned ramp is held in abutment by spring means and so that the continuation of the travel of the mobile assembly, after the mobile blade and its support have themselves reached their end of travel, causes the pivoting of the mobile blade by sui te sliding of the aforementioned shoe on the ramp of the movable blade.
  • the elastic means acting on the movable blade holder to move it in the direction of its end position closest to the fixed blade consist of a plurality of single-acting cylinders, the piston rods of which bear against the rear face of the blade holder and whose cylinders, carried by the body of the movable assembly, are supplied with fluid under adjustable pressure by the setting of a relief valve.
  • the discharge valve is a piloted valve whose opening is controlled by means for detecting the end of travel of the movable blade holder.
  • This arrangement has the advantage of reducing the energy consumption during the stroke of the movable assembly corresponding to the pivoting of the movable blade, by eliminating the pressure in the aforementioned jacks whose action would otherwise tend to be oppose this race.
  • the elastic means acting on the blank holder are constituted by a plurality of single-acting cylinders whose piston rods, which freely pass through the movable blade holder are supported on the rear face of the blank holder and whose cylinders, carried by the body of the mobile assembly, are supplied with fluid under a pressure the maximum value of which is determined by the calibration of a relief valve, shouldered screws freely passing through the blade holder constituting the end stops in the rest position of the blank holder.
  • the flat folding tool according to the invention essentially comprises a fixed blade (2) and a movable blade (3).
  • the fixed blade (2) is located below the movable blade (3) and its upper horizontal face (2a) is intended to receive and support the sheet to be folded (4) before the start of the operation. folding.
  • This fixed blade (2) is fixed to a support (5) capable of being itself fixed to the table of a press brake or the like.
  • Above the support (5) is disposed the movable assembly (6) of this folding tool comprising, inter alia, the movable blade (3).
  • This movable assembly can in particular be fixed, for example, by a tenon (7) or movable slide of the press brake to the table from which the support (5) of the fixed blade (2) is fixed.
  • the fixed blade (2) has below its working edge (2b), that is to say in its lateral face (2c) facing the trajectory of the movable blade (3), a step (7) allowing the release of the sheet (4) when the folding angle is less than 90 °.
  • the movable blade (3) has above its working edge (3a), that is to say in its lateral face (3b) facing the fixed blade (2), a step ( 8) allowing it to execute a bending of the sheet (4) at an angle less than 90 °.
  • the movable blade (3) is carried by an anpport or blade holder (9) mounted sliding in a direction perpendicular to the surface ( 2a) of the fixed blade (2) in the sheath-shaped body (6a) of the mobile assembly (6) and to which the mobile blade (3) is articulated along an axis (11) parallel to the defined fold line by the working edge (2b) of the fixed blade (2).
  • the upper edge of the side face (3b) of the movable blade (3) has a rib (12) of partially cylindrical cross section accommodating in a cradle (13) of complementary section formed in the support (9).
  • this mounting of the movable blade (3) in its support (9) allows it to pivot in the direction of the arrow (14) between two extreme positions, that is to say a rest position as illustrated in FIGS. 1 to 3 and a position for continuing to fold as illustrated in FIG. 4.
  • the blade holder (9) was mounted in the body (6a) of the movable assembly (6) so that it can slide in a direction perpendicular to the horizontal surface (2a) of the fixed blade ( 2), that is to say in the vertical directions illustrated by the arrows (16) and (17). This sliding of the blade holder (9) is limited to two extreme positions, namely a low or extended position as illustrated in FIGS. 1 to 3 and a high or retracted position as illustrated in FIG. 4.
  • Means are provided to act on the blade holder (9) and tend to maintain it normally in its low or extended position.
  • these means are constituted by a plurality of jacks whose free end (18) of the piston rod (19) is applied to the upper face of the blade holder (9) and whose cylinder (21) is housed in the body (6a) of the mobile assembly (6), the seal being ensured by O-rings (22) and (23).
  • the cylinders (21) of these jacks are normally subjected to the pressure of a pressurized fluid supplied by the channel (24) from a pump not shown in the drawing and through a non-return valve (25).
  • a relief valve (26) limits the pressure in the cylinder (21) to the desired value.
  • the means of limiting the stroke of the blade holder (9) to its low or extended position in which it is normally held by the piston rods (19) can be produced in any suitable manner by shouldered screws passing freely through it and anchored in the bottom of the body (6a) of the movable assembly (6).
  • the mobile assembly (6) also comprises a blank holder (33) movable vertically between two extreme positions, the lower one illustrated in FIG. 1 in which its upper face is moved away from the lower face of the blade holder (9) and in which it is retained by shouldered screws (34) freely passing through the blade holder (9), and a high position in which its lower face is applied against the sheet to be folded (4) and its upper face is pressed against the underside of the blade holder (9) to which it serves as a limit stop.
  • Means are provided for acting elastically on the blank holder (33) and normally tend to keep it in the low position as illustrated in FIG. 1. According to a simple embodiment of the invention, as illustrated in the drawing and in particular visible in FIGS.
  • these means consist of piston rods (27) freely passing through the blade holder (9), the lower end of which bears against the upper face of the blank holder ( 33) and the cylinder (28) of which is supplied by a channel (29) and through a non-return valve (31) with pressurized fluid from a pump not shown in the drawing and the maximum pressure of which is limited by a valve discharge (32) whose calibration is adjustable to the desired value.
  • this folding tool is as follows: the assembly being at rest, as illustrated in FIG. 1, the sheet (4) to be folded is placed on the upper horizontal face (2a) of the fixed blade (2) of so that the fold line coincides with the working edge (2b) of the fixed blade (2).
  • the descent in the direction of the arrow (17) of the mobile assembly (6) is controlled. For example, by the action of the movable slide of a press brake on which this tool is mounted.
  • the blank holder (33) enters the first in contact with the sheet (4), the lower edge of the movable blade (3) being, as is known, offset behind the free edge, to the working face of the greenhouse -flan (33).
  • the descent of the mobile assembly (6) being continued while the blank holder (33) is stopped by the sheet (4) and the fixed blade (2), the piston rods (27) acting on it are stopped and the fluid under pressure from the jacks (28) is discharged through the valve discharge (32) whose calibration determines the tightening stroke of the sheet (4) against the fixed blade (2).
  • the pressurized fluid supplying the jacks (21) and (28) automatically return the blade holder (9) and the clamp -flan (33) in the rest position.
  • the relief valve (26) could be a pilot valve.
  • This arrangement has the advantage of making it possible to eliminate the pressure prevailing in the jacks (21) as soon as the lower face of the blade holder (9) has come into contact with the upper face of the blank holder (33). It suffices to provide means for detecting this contact. As a result, during the third fraction of the downward stroke of the movable assembly (6), the energy required for rolling the pressurized fluid contained in the cylinders (21) is saved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Food-Manufacturing Devices (AREA)
  • Knives (AREA)

Abstract

A sheet-metal bending brake has a stationary anvil having a flat and horizontal support surface bounded by and having a straight stationary bending edge and a cut-out back surface forming an acute angle with the support surface. A bending assembly displaceable perpendicular to and adjacent the anvil carries a movable bending blade having a movable bending edge parallel to the stationary edge and spaced therefrom in a direction parallel to the support surface and a clamp bar above the support surface adjacent the blade and having a clamp-bar face confronting and parallel to the support surface. This bar is supported on the bending assembly for limited vertical movement relative thereto between a lower position with the bar face below the movable edge and an upper position with the bar face above the movable edge and is normally spring-biased into the lower position. The assembly can be moved between an upper position with the bar face and the movable edge both above the support surface and a workpiece thereon and a lower position with the bar face pressing the workpiece against the support surface and the movable edge below the stationary edge and through an intermediate position with the bar face and the movable edge level with each other and both engaging the workpiece. Thus the bar clamps the workpiece to the anvil and movement from the intermediate position to the lower position of the blade bends over the workpiece edge region. When moving from the intermediate to the lower position the blade is pivoted forward to further bend the workpiece.

Description

La présente invention concerne un outil de pliage à plat, c'est-à-dire du type comportant une lame fixe présentant une surface horizontale dont un bord constitue la ligne de pliage, et un ensemble mobile en direction de la surface horizontale précitée de la lame fixe et comprenant, essentiellement, un serre-flan lié élastiquement à l'ensemble mobile et apte à être appliqué contre la tôle préalablement placée contre la surface horizontale de la lame fixe pour en assurer le maintien avant le début de la fraction de course de l'ensemble mobile correspondant au pliage et une lame mobile destinée à être déplacée transversalement le long du bord de la surface horizontale de la lame fixe le long duquel est réalisé le pliage.The present invention relates to a flat folding tool, that is to say of the type comprising a fixed blade having a horizontal surface, one edge of which constitutes the folding line, and an assembly movable in the direction of the above-mentioned horizontal surface of the fixed blade and comprising, essentially, a blank holder linked elastically to the mobile assembly and adapted to be applied against the sheet previously placed against the horizontal surface of the fixed blade to ensure its maintenance before the start of the stroke fraction of the movable assembly corresponding to the folding and a movable blade intended to be moved transversely along the edge of the horizontal surface of the fixed blade along which the folding is carried out.

L'inconvénient majeur de ce type d'outil est qu, il n'est adapté que pour un angle de pliage déterminé et pour une épaisseur de tôle déterminée puisque le jeu entre les deux lames fixe et mobile doit correspondre de façon précise à l'épaisseur de la tôle à plier.The major drawback of this type of tool is that it is only suitable for a determined bending angle and for a determined sheet thickness since the clearance between the two fixed and movable blades must correspond precisely to the thickness of the sheet to be bent.

Toute modification de l'angle de pliage ou de l'épaisseur de la tôle à plier exige donc des opérations longues et onéreuses de transformation de l'outil.Any change in the bending angle or the thickness of the sheet to be bent therefore requires long and costly operations to transform the tool.

Le brevet U.S. 3 058 512 révèle un dispositif de pliage à plat du type précité, c'est-à-dire comportant une lame fixe présentant une surface horizontale dont un bord constitue la ligne de pliage et un ensemble mobile en direction de la lame fixe et comprenant essentiellement un serre flan lié élastiquement à l'ensemble mobile et apte à être applique contre la tôle à plier préalablement placée contre la surface horizontale de la lame fixe pour en assurer le maintien avant le début de la fraction de course de l'ensemble mobile correspondant au pliage et une lame mobile destinée à être déplacée transversalement le long du bord de la surface horizontale le long duquel le pliage est réalisé, chaque lame presentant, sur sa face latérale en regard de l'autre lame en fin de course transversale de la lame mobile un redan de dégagement. Dans cet outil, la lame mobile est montée pivotante autour d'un axe parallèle à la ligne de pliage et des moyens sont prévus pour provoquer le pivotement de la lame mobile en direction de la lame fixe après qu'elle ait atteint sa fin de course transversale et permettre ainsi la poursuite du pliage de la tête à un angle inférieur à 90°, cet angle de pliage étant déterminé par la valeur de la course en translation et/ou en rotation de la lame mobile.US Pat. No. 3,058,512 discloses a flat folding device of the aforementioned type, that is to say comprising a fixed blade having a horizontal surface of which one edge constitutes the fold line and an assembly movable in the direction of the fixed blade. and essentially comprising a blank clamp connected elastically to the mobile assembly and capable of being applied against the sheet to be folded previously placed against the horizontal surface of the fixed blade to ensure its maintenance before the start of the fraction of travel of the assembly mobile corresponding to the folding and a mobile blade intended to be moved transversely along the edge of the horizontal surface along which the folding is carried out, each blade having, on its lateral face opposite the other blade at the end of the transverse stroke of the movable blade a step of release. In this tool, the movable blade is pivotally mounted about an axis parallel to the fold line and means are provided to cause the pivoting blade to pivot towards the fixed blade after it has reached its end of travel. transverse and thus allow the continued folding of the head at an angle less than 90 °, this folding angle being determined by the value of the travel in translation and / or rotation of the movable blade.

Dans ce dispositif, la lame mobile est portée par des leviers articulés rendant ce dispositif très complexe, d'un montage long et délicat et d'un entretien coûteux. En outre dans ce dispositif, l'amplitude du mouvement de la lame mobile et, par consequent, l'angle de pliage qu'elle réalise, sont détermines par une came et ne peuvent donc être modifiés que par un changement de came. Ce dispositif n'est donc pas d'une utilisation très souple et, de ce fait, n'est destiné qu'à un type de pliage déterminé, réalisé en grande série.In this device, the movable blade is carried by articulated levers making this device very complex, long and delicate assembly and costly maintenance. Furthermore, in this device, the amplitude of movement of the movable blade and, consequently, the folding angle which it achieves, are determined by a cam and can therefore only be modified by a change of cam. This device is therefore not very flexible to use and, therefore, is only intended for a specific type of folding, carried out in large series.

La présente invention vise à remédier à ces inconvénients. A cet effet, dans l'outil qu'elle concerne et qui est du type précité, la lame mobile est portée par un support ou porte-lame mobile auquel elle est articulée et qui est monté coulissant dans le corps en forme de fourreau de l'ensemble mobile, entre deux positions extrêmes, des moyens élastiques tendant à déplacer ce support en direction de la lame fixe, au moins jusqu'au début de la course de pivotement de la lame mobile et les moyens pour provoquer son pivotement sont constitués par un pan incliné formant rampe prévu le long du bord libre de la face latérale de la lame mobile opposée à celle en regard avec la lame fixe et par un sabot d'inclinaison complémentaire porté par le corps de l'ensemble mobilet et contre lequel la rampe précitée est maintenue en appui par des moyens à ressort et de telle sorte que la poursuite de la course de l'ensemble mobile, après que la lame mobile et son support aient eux-mêmes atteint leur fin de course, provoque le pivotement de la lame mobile par suite du glissement du sabot précité sur la rampe de la lame mobile.The present invention aims to remedy these drawbacks. To this end, in the tool which it relates to and which is of the aforementioned type, the movable blade is carried by a movable support or blade holder to which it is articulated and which is slidably mounted in the sheath-shaped body of the mobile assembly, between two extreme positions, elastic means tending to move this support in the direction of the fixed blade, at least until the start of the pivoting stroke of the movable blade and the means for causing it to pivot consist of a inclined face forming a ramp provided along the free edge of the lateral face of the movable blade opposite to that facing the fixed blade and by a complementary tilt shoe carried by the body of the mobile assembly and against which the aforementioned ramp is held in abutment by spring means and so that the continuation of the travel of the mobile assembly, after the mobile blade and its support have themselves reached their end of travel, causes the pivoting of the mobile blade by sui te sliding of the aforementioned shoe on the ramp of the movable blade.

Avantageusement, les moyens élastiques agissant sur le porte-lame mobile pour le déplacer en direction de sa position fin de course la plus proche de la lame fixe sont constitués par une pluralité de vérins à simple effet, dont les tiges de piston sont en appui contre la face arrière du porte-lame et dont les cylindres, portés par le corps de l'ensemble mobile, sont alimentés en fluide sous pression réglable par le tarage d'une valve de décharge.Advantageously, the elastic means acting on the movable blade holder to move it in the direction of its end position closest to the fixed blade consist of a plurality of single-acting cylinders, the piston rods of which bear against the rear face of the blade holder and whose cylinders, carried by the body of the movable assembly, are supplied with fluid under adjustable pressure by the setting of a relief valve.

Suivant une forme d'exécution perfectionnée de l'invention, la valve de décharge est un clapet piloté dont l'ouverture est commandée par des moyens de détection de la fin de course du porte-lame mobile.According to an improved embodiment of the invention, the discharge valve is a piloted valve whose opening is controlled by means for detecting the end of travel of the movable blade holder.

Cette disposition présente l'avantage de diminuer la consommation d'énergie durant la course de l'ensemble mobile correspondant au pivotement de la lame mobile, par suppression de la pression dans les vérins précités dont l'action tendrait, sans cela, à s'opposer à cette course.This arrangement has the advantage of reducing the energy consumption during the stroke of the movable assembly corresponding to the pivoting of the movable blade, by eliminating the pressure in the aforementioned jacks whose action would otherwise tend to be oppose this race.

De préférence, les moyens élastiques agissant sur le serre-flan sont constitués par une pluralité de vérins à simple effet dont les tiges de pistons, qui traversent librement le porte-lame mobile sont en appui sur la face postérieure du serre-flan et dont les cylindres, portés par le corps de l'ensemble mobile, sont alimentés en fluide sous une pression dont la valeur maximale est déterminée par le tarage d'une valve de décharge, des vis épaulées traversant librement le porte-lame constituant les butées fin de course en position de repos du serre-flan.Preferably, the elastic means acting on the blank holder are constituted by a plurality of single-acting cylinders whose piston rods, which freely pass through the movable blade holder are supported on the rear face of the blank holder and whose cylinders, carried by the body of the mobile assembly, are supplied with fluid under a pressure the maximum value of which is determined by the calibration of a relief valve, shouldered screws freely passing through the blade holder constituting the end stops in the rest position of the blank holder.

De toute façon, l'invention sera bien comprise à l'aide de la description qui suit en référence aux dessins schématiques annexés représentant, à titre d'exemple non limitatif, une forme d'exécution de cet outil de pliage:

  • Figures 1 à 4 sont des vues en coupe transversale de quatre positions remarquables de la course de l'ensemble mobile;
  • Figure 5 est une vue en coupe transversale similaire aux figures 1 à 4 mais passant par un autre plan et illustrant le montage du serre-flan;
  • Figure 6 est une vue de face en élévation avec coupe partielle de l'outil de pliage selon l'invention.
In any case, the invention will be clearly understood with the aid of the description which follows with reference to the appended schematic drawings showing, by way of nonlimiting example, an embodiment of this folding tool:
  • Figures 1 to 4 are cross-sectional views of four remarkable positions of the travel of the mobile assembly;
  • Figure 5 is a cross-sectional view similar to Figures 1 to 4 but passing through another plane and illustrating the mounting of the blank holder;
  • Figure 6 is a front elevational view with partial section of the folding tool according to the invention.

L'outil de pliage à plat, selon l'invention, comprend essentiellement une lame fixe (2) et une lame mobile (3).The flat folding tool according to the invention essentially comprises a fixed blade (2) and a movable blade (3).

Dans cet exemple, la lame fixe (2) est située au-dessous de la lame mobile (3) et sa face horizontale supérieure (2a) est destinée à recevoir et supporter la tôle à plier (4) avant le début de l'opération de pliage. Cette lame fixe (2) est fixée à un support (5) apte à être lui-même fixé à la table d'une presse plieuse ou similaire. Au-dessus du support (5) est disposé l'ensemble mobile (6) de cet outil de pliage comprenant, entre autres, la lame mobile (3). Cet ensemble mobile peut être notamment fixé, par exemple, par un tenon (7) ou coulisseau mobile de la presse plieuse à la table de laquelle est fixé le support (5) de la lame fixe (2).In this example, the fixed blade (2) is located below the movable blade (3) and its upper horizontal face (2a) is intended to receive and support the sheet to be folded (4) before the start of the operation. folding. This fixed blade (2) is fixed to a support (5) capable of being itself fixed to the table of a press brake or the like. Above the support (5) is disposed the movable assembly (6) of this folding tool comprising, inter alia, the movable blade (3). This movable assembly can in particular be fixed, for example, by a tenon (7) or movable slide of the press brake to the table from which the support (5) of the fixed blade (2) is fixed.

Comme le montrent notamment les figures 1 à 5, la lame fixe (2) présente en-dessous de son bord de travail (2b), c' est-à-dire dans sa face latérale (2c) en regard de la trajectoire de la lame mobile (3), un redan (7) permettant le dégagement de la tôle (4) lorsque l'angle de pliage est inférieur à 90°.As shown in particular in FIGS. 1 to 5, the fixed blade (2) has below its working edge (2b), that is to say in its lateral face (2c) facing the trajectory of the movable blade (3), a step (7) allowing the release of the sheet (4) when the folding angle is less than 90 °.

Pour la même raison, la lame mobile (3) présente au-dessus de son bord de travail (3a), c'est-à-dire dans sa face latérale (3b) tournée vers la lame fixe (2), un redan (8) lui permettant d'exécuter un pliage de la tôle (4) à un angle inférieur à 90°.For the same reason, the movable blade (3) has above its working edge (3a), that is to say in its lateral face (3b) facing the fixed blade (2), a step ( 8) allowing it to execute a bending of the sheet (4) at an angle less than 90 °.

Pour permettre un tel pliage à un angle inférieur à 90°, comme le montrent les mêmes figures du dessin, la lame mobile (3) est portée par un anpport ou porte-lame (9) monté coulissant dans une direction perpendiculaire à la surface (2a) de la lame fixe (2) dans le corps (6a) en forme de fourreau de l'ensemble mobile (6) et auquel la lame mobile (3) est articulée suivant un axe (11) parallèle à la ligne de pliage définie par le bord de travail (2b) de la lame fixe (2). Pour cela, le bord supérieur de la face latérale (3b) de la lame mobile (3) presente une nervure (12) de section transversale partiellement cylindrique logeant dans un berceau (13) de section complémentaire ménagée dans le support (9). Comme cela ressort nettement du dessin, ce montage de la lame mobile (3) dans son support (9) autorise son pivotemcnt dans le sens de la flèche (14) entre deux positions extrêmes, c'est-à-dire une position de repos telle qu'illustrée sur les figures 1 à 3 et une position de poursuite de pliage telle qu'illustrée sur la figure 4.To allow such folding at an angle of less than 90 °, as shown in the same figures of the drawing, the movable blade (3) is carried by an anpport or blade holder (9) mounted sliding in a direction perpendicular to the surface ( 2a) of the fixed blade (2) in the sheath-shaped body (6a) of the mobile assembly (6) and to which the mobile blade (3) is articulated along an axis (11) parallel to the defined fold line by the working edge (2b) of the fixed blade (2). For this, the upper edge of the side face (3b) of the movable blade (3) has a rib (12) of partially cylindrical cross section accommodating in a cradle (13) of complementary section formed in the support (9). As is clear from the drawing, this mounting of the movable blade (3) in its support (9) allows it to pivot in the direction of the arrow (14) between two extreme positions, that is to say a rest position as illustrated in FIGS. 1 to 3 and a position for continuing to fold as illustrated in FIG. 4.

Des pistons (15) à ressort (10) logés dans le porte-lame (9) tendent à maintenir constamment la lame mobile (3) dans sa position de repos illustrée par les figures 1 à 3.Spring-loaded pistons (15) (10) housed in the blade holder (9) tend to constantly keep the movable blade (3) in its rest position illustrated in FIGS. 1 to 3.

II a été indiqué précédemment que le porte-lame (9) était monté dans le corps (6a) de l'ensemble mobile (6) de manière à pouvoir coulisser dans une direction perpendiculaire à la surface horizontale (2a) de la lame fixe (2), c'est-à-dire dans les directions verticales illustrées par les flèches (16) et (17). Ce coulissement du porte-lame (9) est limité à deux positions extrêmes à savoir une position basse ou sortie telle qu'illustrée sur les figures 1 à 3 et une position haute ou rentrée telle qu'illustrée sur la figure 4.It was previously indicated that the blade holder (9) was mounted in the body (6a) of the movable assembly (6) so that it can slide in a direction perpendicular to the horizontal surface (2a) of the fixed blade ( 2), that is to say in the vertical directions illustrated by the arrows (16) and (17). This sliding of the blade holder (9) is limited to two extreme positions, namely a low or extended position as illustrated in FIGS. 1 to 3 and a high or retracted position as illustrated in FIG. 4.

Des moyens sont prévus pour agir sur le porte-lame (9) et tendre à le maintenir normalement dans sa position basse ou sortie. Dans l'exemple illustré sur le dessin, ces moyens sont constitués par une pluralité de vérins dont l'extrémité libre (18) de la tige de piston (19) est appliquée sur la face supérieure du porte-lame (9) et dont le cylindre (21) est logé dans le corps (6a) de l'ensemble mobile (6), l'étanchéité étant assurée par des joints toriques (22) et (23). Les cylindres (21) de ces vérins sont normalement soumis à la pression d'un fluide sous pression alimenté par le canal (24) depuis une pompe non représentée sur le dessin et à travers un clapet anti-retour (25). Une valve de décharge (26) permet de limiter la pression dans le cylindre (21) à la valeur désirée.Means are provided to act on the blade holder (9) and tend to maintain it normally in its low or extended position. In the example illustrated in the drawing, these means are constituted by a plurality of jacks whose free end (18) of the piston rod (19) is applied to the upper face of the blade holder (9) and whose cylinder (21) is housed in the body (6a) of the mobile assembly (6), the seal being ensured by O-rings (22) and (23). The cylinders (21) of these jacks are normally subjected to the pressure of a pressurized fluid supplied by the channel (24) from a pump not shown in the drawing and through a non-return valve (25). A relief valve (26) limits the pressure in the cylinder (21) to the desired value.

Les moyens de limiter la course du porte-lame (9) à sa position basse ou sortie dans laquelle il est normalement maintenu par les tiges de piston (19) peuvent être réalisés de n'importe quelle manière appropriée par des vis épaulées le traversant librement et ancrées dans le fond du corps (6a) de l'ensemble mobile (6).The means of limiting the stroke of the blade holder (9) to its low or extended position in which it is normally held by the piston rods (19) can be produced in any suitable manner by shouldered screws passing freely through it and anchored in the bottom of the body (6a) of the movable assembly (6).

Pour que le déplacement du porte-lame (9) et, par consenuent de la lame mobile (3) dans le sens de la flèche (16) par rapport au corps (6a) de l'ensemble mobile (6), provoque le pivotement de la lame mobile (3) dans le sens de la fléche (14), d'une part cette dernière presente le long du bord inférieur de sa face (3c) opposée à sa face (3b) une rampe inclinée (3d) et, d'autre part, le bord inférieur correspondant du corps (6a) porte un sabot (6b) d'inclinaison complémentaire contre lequel la rampe (3d) est normalement maintenue en appui par l'action des pistons (15) à ressort (10).So that the movement of the blade holder (9) and, consequently of the movable blade (3) in the direction of the arrow (16) relative to the body (6a) of the movable assembly (6), causes the pivoting of the movable blade (3) in the direction of the arrow (14), on the one hand the latter presents along the lower edge of its face (3c) opposite its face (3b) an inclined ramp (3d) and, on the other hand, the corresponding lower edge of the body (6a) carries a shoe (6b) of complementary inclination against which the ramp (3d) is normally held in abutment by the action of the pistons (15) with spring (10) .

L'ensemble mobile (6) comprend aussi un serre-flan (33) mobile verticalement entre deux positions extrêmes, l'une basse illustrée sur la figure 1 dans laquelle sa face supérieure est éloiguée de la face inférieure du porte-lame (9) et dans laquelle il est retenu par des vis épaulées (34) traversant librement le porte-lame (9), et une position haute dans laquelle sa face inférieure est appliquée contre la tôle à plier (4) et sa face supérieure est en appui contre la face inférieure du porte-lame (9) auquel il sert de butée de fin de course. Des moyens sont prévus pour agir élastiquement sur le serre-flan (33) et tendent normalement à le maintenir en position basse telle qu'illustrée sur la figure 1. Suivant une forme d'exécution simple de l'invention, telle qu'illustrée sur le dessin et notamment visible sur les figures 5 et 6, ces moyens sont constitués par des tiges de piston (27) traversant librement le porte-lame (9) dont l'extrémité inférieure est en appui contre la face supérieure du serre-flan (33) et dont le cylindre (28) est alimenté par un canal (29) et à travers un clapet anti-retour (31) en fluide sous pression depuis une pompe non représentée sur le dessin et dont la pression maximale est limitée par une valve de décharge (32) dont le tarage est réglable à la valeur désirée.The mobile assembly (6) also comprises a blank holder (33) movable vertically between two extreme positions, the lower one illustrated in FIG. 1 in which its upper face is moved away from the lower face of the blade holder (9) and in which it is retained by shouldered screws (34) freely passing through the blade holder (9), and a high position in which its lower face is applied against the sheet to be folded (4) and its upper face is pressed against the underside of the blade holder (9) to which it serves as a limit stop. Means are provided for acting elastically on the blank holder (33) and normally tend to keep it in the low position as illustrated in FIG. 1. According to a simple embodiment of the invention, as illustrated in the drawing and in particular visible in FIGS. 5 and 6, these means consist of piston rods (27) freely passing through the blade holder (9), the lower end of which bears against the upper face of the blank holder ( 33) and the cylinder (28) of which is supplied by a channel (29) and through a non-return valve (31) with pressurized fluid from a pump not shown in the drawing and the maximum pressure of which is limited by a valve discharge (32) whose calibration is adjustable to the desired value.

Le fonctionnement de cet outil de pliage est le suivant: l'ensemble étant au repos, comme illustré sur la figure 1, la tôle (4) à plier est placée sur la face horizontale supérieure (2a) de la lame fixe (2) de manière que la ligne de pliage coïncide avec le bord de travail (2b) de la lame fixe (2).The operation of this folding tool is as follows: the assembly being at rest, as illustrated in FIG. 1, the sheet (4) to be folded is placed on the upper horizontal face (2a) of the fixed blade (2) of so that the fold line coincides with the working edge (2b) of the fixed blade (2).

La descente dans le sens de la flèche (17) de l'ensemble mobile (6) est commandé. Par exemple, par l'action du coulisseau mobile d'une presse plieuse sur laquelle cet outil est monté. Le serre-flan (33) entre le premier en contact avec la tôle (4), le bord inférieur de la lame mobile (3) étant, comme cela est connu, décalé en arrière du bord libre, à la face de travail du serre-flan (33). La descente de l'ensemble mobile (6) etant poursuivie alors que le serre-flan (33) est arrêté par la tôle (4) et la lame fixe (2), les tiges de piston (27) agissant sur lui sont stoppées et le fluide sous pression des vérins (28) est évacué à travers la valve de décharge (32) dont le tarage détermine la course de serrage de la tôle (4) contre la lame fixe (2). Durant cette deuxième fraction de la course descendante, l'ensemble mobile (6) au cours de laquelle seul le serre-flan (33) est immobilisé, la face inférieure du porte-lame (9) se rapproche de la face supérieure du serre-flan (33) jusqu'à entrer en contact avec elle, comme illustré sur la figure 3. Jusqu'à ce moment, cet outil s'est comporté comme un outil classique de pliage à plat, à cette difference près que le jeu entre lames fixe (2) et mobile (3) est visiblement supérieur à la normale et non limité à l'épaisseur de la tôle (4). Il en résulte qu'à la fin de cette deuxième fraction de la course de l'ensemble mobile (6), l'angle de pliage de tôle (4) est normalement supérieur à 90°.The descent in the direction of the arrow (17) of the mobile assembly (6) is controlled. For example, by the action of the movable slide of a press brake on which this tool is mounted. The blank holder (33) enters the first in contact with the sheet (4), the lower edge of the movable blade (3) being, as is known, offset behind the free edge, to the working face of the greenhouse -flan (33). The descent of the mobile assembly (6) being continued while the blank holder (33) is stopped by the sheet (4) and the fixed blade (2), the piston rods (27) acting on it are stopped and the fluid under pressure from the jacks (28) is discharged through the valve discharge (32) whose calibration determines the tightening stroke of the sheet (4) against the fixed blade (2). During this second fraction of the downward stroke, the movable assembly (6) during which only the blank holder (33) is immobilized, the lower face of the blade holder (9) approaches the upper face of the holder blank (33) until it comes into contact with it, as illustrated in FIG. 3. Until this moment, this tool has behaved like a conventional flat folding tool, with the difference that the play between blades fixed (2) and mobile (3) is visibly greater than normal and not limited to the thickness of the sheet (4). As a result, at the end of this second fraction of the travel of the movable assembly (6), the sheet bending angle (4) is normally greater than 90 °.

Si l'on veut obtenir un pliage à un angle inférieur ou égal à 90°, i1 suffit alors de poursuivre la descente de l'ensemble mobile (6) sur une troisième fraction de sa course au cours de laquelle le serre-flan (33) étant toujours immobilisé par la tôle (4) et le porte-lame (9) étant lui-même immobilisé par le serre-flan (33), seul le corps (6a) poursuit sa descente dans le sens de la flèche (17) de telle sorte que le sabot (6b) glissant sur la rampe (3d) de la lame (3c) provoque son pivotement dans le sens de la flèche (14). L'amplitude de ce pivotement peut éventuellement être limité à la valeur désirée de l'angle de pliage. Il suffit pour cela de limiter la valeur correspondante de la course de descente de l'ensemble mobile (6). La figure 4 montre cet outil dans la position la plus basse possible de l'ensemble mobile (6) Pour une épaisseur de tôle déterminée, c'est-à-dire correspondant à l'angle de pliage le plus petit de la tôle (4).If one wishes to obtain a folding at an angle less than or equal to 90 °, i1 then suffices to continue the descent of the mobile assembly (6) over a third fraction of its travel during which the blank holder (33 ) being always immobilized by the sheet (4) and the blade holder (9) being itself immobilized by the blank holder (33), only the body (6a) continues its descent in the direction of the arrow (17) so that the shoe (6b) sliding on the ramp (3d) of the blade (3c) causes it to pivot in the direction of the arrow (14). The amplitude of this pivoting can possibly be limited to the desired value of the folding angle. To do this, it suffices to limit the corresponding value of the descent stroke of the mobile assembly (6). Figure 4 shows this tool in the lowest possible position of the movable assembly (6) For a determined sheet thickness, that is to say corresponding to the smallest bending angle of the sheet (4 ).

Il en résulte donc que sans aucune modification de l'outillage, on peut obtenir, pour une tôle de même épaisseur ou pour des tôles d'épaisseurs différentes, des angles de pliage différents dont la valeur peut être comprise entre 180° et la valeur minimale telle qu'illustrée sur la figure 4.It therefore follows that without any modification of the tooling, it is possible to obtain, for a sheet of the same thickness or for sheets of different thicknesses, different bending angles, the value of which can be between 180 ° and the minimum value. as shown in Figure 4.

Lorsque le pliage désiré est réalisé, il suffit de commander la remontée de l'ensemble mobile (6), le fluide sous pression alimentant les vérins (21) et (28) assurent automatiquement le retour du porte-lame (9) et du serre-flan (33) en position de repos.When the desired folding is carried out, it suffices to control the raising of the mobile assembly (6), the pressurized fluid supplying the jacks (21) and (28) automatically return the blade holder (9) and the clamp -flan (33) in the rest position.

Il a été indiqué précédemment que la valve de décharge (26) pouvait être une valve pilotée. Cette disposition présente en effet l'avantage de permettre d'éliminer la pression régnant dans les vérins (21) dès que la face inférieure du porte-lame (9) est entrée en contact avec la face supérieure du serre-flan (33). Il suffit pour cela de de prévoir des moyens de détection de ce contact. Il en résulte alors qu' au cours de la troisième fraction de la course descendante de l'ensemble mobile (6), l'énergie nécessaire au laminage du fluide sous pression contenu dans les cylindres (21) est économisé.It was previously indicated that the relief valve (26) could be a pilot valve. This arrangement has the advantage of making it possible to eliminate the pressure prevailing in the jacks (21) as soon as the lower face of the blade holder (9) has come into contact with the upper face of the blank holder (33). It suffices to provide means for detecting this contact. As a result, during the third fraction of the downward stroke of the movable assembly (6), the energy required for rolling the pressurized fluid contained in the cylinders (21) is saved.

Comme il va de soi et comme il ressort de ce qui précède, l'invention ne se limite pas à la seule forme d'exécution de cet outil de pliage qui a été décrite ci-dessus à titre d'exemple non limitatif, elle en embrasse au contraire toutes les variantes de réalisation.As is obvious and as follows from the above, the invention is not limited to the only embodiment of this folding tool which has been described above by way of non-limiting example, it on the contrary embraces all variant embodiments.

Claims (4)

1. A device for flat bending of the type including a fixed blade (2) having a horizontal surface (2a), one edge (2b) of which constitutes the bending line, and an assembly (6) which is movable in the direction of the fixed blade (2) and essentially comprising a blank clamp (33) resiliently connected to the movable assembly (6) and adapted to be applied against the sheet metal (4) to be bent, which has been previously placed against the horizontal surface (2a) of the fixed blade (2) to ensure that it is held in position before the start of that part of the travel of the movable assembly (6) corresponding to the bending, and a movable blade (3) intended to be moved transversely along the edge (2b) of the horizontal surface (2a) along which the bending is effected, each blade (2, 3) having, on its lateral face (2c, 3b) opposed to the other blade at the end of the transverse travel of the movable blade (3), a disengagement step (7, 8), and in which the movable blade (3) is pivotally mounted about an axis (11) parallel to the bending line and means are provided which cause the movable blade (3) to pivot in the direction (14) of the fixed blade (2) after it has reached the end of its transverse travel and thus enable the sheet metal (4) to be bent to an angle less than 90°, this angle of bend being determined by the amount of travel in translation and/or in rotation of the movable blade (3), characterised in that the movable blade (3) is carried by a movable support (9) or blade-carrier, to which it is articulated and which is mounted in the body (6a) so as to slide between two extreme positions, the body being in the form of a sleeve of the movable assembly (6), resilient means tending to move this support (9) in the direction (17) of the fixed blade (2), at least as far as the beginning of the pivotal travel of the movable blade (3), and the means for causing its pivotal travel are constituted by an inclined surface (3d) forming a ramp provided along the free edge of the lateral face (3c) of the movable blade (3) opposed to that (3b) which faces the fixed blade (2) and by a shoe (6b) of complementary inclination carried by the body (6a) of the movable assembly (6) and against which the aforementioned ramp (3d) is held in engagement by spring means (15, 10) and in such a way that continuation of the travel of the movable assembly (6), after the movable blade (3) and its support (9) have themselves reached the end of their travel, causes the movable blade (3) to pivot as a result of the shoe (6b) sliding on the ramp (3d) of the movable blade (3).
2. A device for flat bending according to Claim 1, characterised in that the resilient means acting on the movable blade carrier (9) to move it in the direction (17) of its end of travel position closest to the fixed blade (2) are constituted by a plurality of single-acting jacks, of which the rods (18) of the pistons (19) bear against the rear face of the blade carrier (9) and of which the cylinders (21), carried by the body (6a) of the movable assembly (6), are supplied with fluid under-pressure which can be regulated by adjustment of a discharge valve (26).
3. A device for flat bending according to Claim 2, characterised in that the discharge valve (26) is a controlled valve, the opening of which is controlled by means which detect the end of travel of the movable blade carrier (9).
4. A device for flat bending according to any one of the preceding claims, characterised in that the resilient means acting on the blank clamp (33) are constituted by a plurality of single acting jacks of which the piston rods (27), which pass freely through the movable blade carrier (9), bear on the rear face of the blank clamp (33) and of which the cylinders (28), carried by the body (6a) of the movable assembly (6), are supplied with fluid under pressure, the maximum value of which is determined by adjustment of a discharge valve (32), shouldered screws (26) which pass freely through the blade carrier (9) constituting the end of travel abutments in the rest position of the blank clamp (33).
EP83420042A 1982-03-19 1983-03-14 Flat bending device Expired EP0089904B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83420042T ATE17449T1 (en) 1982-03-19 1983-03-14 FLAT BENDING DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8205046 1982-03-09
FR8205046A FR2523483B1 (en) 1982-03-19 1982-03-19 FLAT FOLDING TOOL

Publications (2)

Publication Number Publication Date
EP0089904A1 EP0089904A1 (en) 1983-09-28
EP0089904B1 true EP0089904B1 (en) 1986-01-15

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US (1) US4520646A (en)
EP (1) EP0089904B1 (en)
JP (1) JPS58176023A (en)
AT (1) ATE17449T1 (en)
DE (1) DE3361825D1 (en)
ES (1) ES8401733A1 (en)
FR (1) FR2523483B1 (en)

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SU837480A1 (en) * 1979-06-20 1981-06-15 Паневежский Завод Точной Механики Bending die
JPS5847317B2 (en) * 1980-08-15 1983-10-21 大日機工株式会社 Inertia prevention device for arm mechanism
JPS58467A (en) * 1981-06-23 1983-01-05 Suzuki Tanko Co Ltd Transportation equipment for agricultural tractor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018055193A1 (en) 2016-09-26 2018-03-29 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Tool, machine tool, and method for machining planar workpieces
US11478835B2 (en) 2016-09-26 2022-10-25 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Machining planar workpieces

Also Published As

Publication number Publication date
EP0089904A1 (en) 1983-09-28
FR2523483B1 (en) 1985-09-27
ES520766A0 (en) 1984-01-01
DE3361825D1 (en) 1986-02-27
ES8401733A1 (en) 1984-01-01
FR2523483A1 (en) 1983-09-23
US4520646A (en) 1985-06-04
ATE17449T1 (en) 1986-02-15
JPS58176023A (en) 1983-10-15

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