EP2207637B1 - Machine for bending a profile in two bending directions and bending tool - Google Patents

Abstract

The invention relates to a machine for bending a profile in two bending directions, that comprises a bending tool including at least two clamping forms (19) centered on the profile bending axis and having the shape of disks having planar junction surfaces (19a) extending in planes perpendicular to said bending axis, in which are formed two rectilinear grooves (20b, 21b) and a peripheral rebate (22b) extending between said grooves and profiled as a continuation thereof, the grooves and the rebate being adapted so that, in the joined position of the junction surfaces (19a) of two clamping foams, the joined grooves define two clamping ducts of a profile and the joined rebates define a profile-winding bearing surface extending between said clamping ducts.

Description

The invention relates to a machine for bending a profile in two bending directions and also to a bending tool adapted to equip such a bending machine.

• le galet de cintrage étant axé sur l'axe de cintrage (z),
• et le mors de serrage étant mobile en translation relativement au galet de cintrage selon un axe perpendiculaire à l'axe de cintrage (z), entre une position accolée contre le dit galet de cintrage, de serrage et d'enroulement d'un profilé à cintrer, et une position éloignée du dit galet de cintrage, d'introduction d'un profilé à cintrer entre ce dernier et le dit mors de serrage.

The current conventional bending machines comprise means for holding and moving the sections along a longitudinal axis of displacement (x), and a bending head rotating around an axis (z), called the bending axis, the said head. bending conventionally comprising a bending roller and a clamping jaw having bearing surfaces between which is passed, is tightened and then wound a profile to be bent:

• the bending roller being oriented on the bending axis (z),
• and the clamping jaw being movable in translation relative to the bending roller along an axis perpendicular to the bending axis (z), between a position contiguous against said bending roller, clamping and winding a profile to bending, and a position remote from said bending roller, introducing a profile to be bent between the latter and said clamping jaw.

Such machines have a kinematics combining a relative displacement of the bending roller and the clamping jaw along an axis perpendicular to the bending axis (z), and a simultaneous rotation of the bending roller and the clamping jaw, in the position contiguous of these, around the bending axis (z).

Such a kinematics has, in particular, the advantage of allowing the design of bending machines profiles in two directions of bending, and many bending machines of this type currently exist.

On the other hand, this kinematics leads to the production of relatively complex bending heads which, moreover, have a relatively large size.

In addition, an additional disadvantage of such bending machines lies in the fact that the bending angle is limited to a value of 180 ° or less than 180 ° when the end of the bent section has equipment such as a nut, to allow to clear the profile after bending.

• au moins deux formes de serrage axées sur l'axe de cintrage (z), présentant la forme de disques comportant des faces de jonction planes s'étendant dans des plans perpendiculaires au dit axe de cintrage, dans lesquelles sont ménagées une rainure rectiligne d'axe longitudinal perpendiculaire au rayon de cintrage, dotée d'une face d'extrémité d'introduction d'un profilé (P), et une feuillure périphérique se profilant dans la continuité de la face d'introduction de la dite rainure, les dites rainure et feuillure étant adaptées de façon que, dans la position accolée des faces de jonction de deux formes de serrage, deux rainures accolées délimitent un conduit de serrage d'un profilé (P) doté d'une face d'extrémité d'introduction du dit profilé, et les feuillures accolées définissent, dans la continuité de la dite face d'introduction, une surface d'appui d'enroulement du dit profilé,
• des moyens de déplacement relatif en translation des formes de serrage selon l'axe de cintrage (z), aptes à les déplacer entre une position écartée d'introduction et de retrait d'un profilé (P), et une position accolée de cintrage du dit profilé,
• et des moyens d'entraînement en rotation aptes à entraîner une rotation simultanée des formes de serrage dans la position accolée de ces dernières.

In order to overcome these disadvantages, one solution has been to design bending machines such as in particular described in patent applications. FR2117745 , EP1561522 and EP0737526 , having a totally different kinematics, and whose bending head comprises:

• at least two clamping shapes oriented on the bending axis (z), having the form of discs having planar joining faces extending in planes perpendicular to said bending axis, in which are formed a straight groove of longitudinal axis perpendicular to the bending radius, provided with an insertion end face of a profile (P), and a peripheral rebate profiled in the continuity of the insertion face of said groove, said groove and rabbet being adapted so that, in the contiguous position of the junction faces of two clamping shapes, two contiguous grooves delimit a clamping duct of a profile (P) provided with an insertion end face of said profile, and contiguous rabbets define, in the continuity of said insertion face, a bearing surface of said winding profile,
• relative displacement means in translation of the clamping shapes along the bending axis (z), able to move them between a spaced position of introduction and withdrawal of a profile (P), and an adjoining bending position of the said profile,
• and rotation drive means adapted to cause simultaneous rotation of the clamping forms in the contiguous position thereof.

Such bending machines thus have a kinematics combining a relative displacement of clamping shapes along the bending axis (z), and a simultaneous rotation of the clamping shapes, in the contiguous position of the latter, around this bending axis (z).

According to this principle, the bending head thus comprises clamping shapes oriented on the bending axis (z), able to move along this axis and to rotate around the latter.

This design leads to a significant reduction in the size of the bending heads and to simplify the design of said bending heads, due to a kinematic having a single reference axis, namely the bending axis (z).

In addition, in the spaced apart position of the clamping forms, they completely release the plane in which the profile is located, so that the withdrawal of the latter does not pose any problem even if the bending angle is greater than 180 °.

On the other hand, the major disadvantage of such bending machines lies in the fact that they only allow the bending to take place in one direction of bending.

The present invention aims to overcome this drawback and has the main objective of providing a bending machine of the type described above, that is to say whose kinematics has a single reference axis, able to bend a profile in two bending direction.

Another object of the invention is to provide a bending machine a profile in two bending directions to achieve bending angles greater than 180 °.

• les formes de serrage comportent, ménagée dans chacune de leur face de jonction, une seconde rainure rectiligne formant avec la première rainure rectiligne une paire de rainures délimitant, dans la position accolée des faces de jonction de deux formes de serrage, deux conduits de serrage entre les faces d'introduction desquels s'étend la surface d'appui d'enroulement des profilés (P) formée des deux feuillures périphériques accolées, l'agencement des dites rainures et feuillures étant adapté pour que la surface d'appui d'enroulement des profilés délimite, entre les faces d'introduction des deux conduits de serrage, un arc de cercle au moins égal à 270 degrés apte à permettre le cintrage d'un tronçon de profilé (P) :
  • soit selon un premier sens de cintrage réalisé en utilisant une des deux paires de rainures, par rotation des formes de serrage selon un premier sens de rotation,
  • soit selon un second sens de cintrage réalisé en utilisant l'autre paire de rainures, par rotation des formes de serrage selon un sens de rotation inverse du premier sens de rotation,
• des moyens de déplacement relatif des moyens de maintien du profilé (P) et de la tête de cintrage sont adaptés pour axer soit l'une soit l'autre paire de rainures sur l'axe longitudinal (x).

For this purpose, the invention aims a bending machine with a bending head as described in the preamble above, characterized in that:

• the clamping forms comprise, formed in each of their junction face, a second rectilinear groove forming with the first rectilinear groove a pair of grooves delimiting, in the adjoining position of the junction faces of two clamping shapes, two clamping ducts between the introduction faces of which extends the bearing surface of the rolled sections (P) formed by two adjoining peripheral rebates, the arrangement of said grooves and rabbets being adapted so that the winding bearing surface of the sections delimits, between the insertion faces of the two clamping ducts, an arc of circle at least equal to 270 degrees able to allow the bending of a profile section (P):
  • in a first bending direction made using one of the two pairs of grooves, by rotating the clamping shapes in a first direction of rotation,
  • in a second direction of bending made using the other pair of grooves, by rotation of the clamping shapes in a direction of rotation opposite to the first direction of rotation,
• relative displacement means of the profile holding means (P) and the bending head are adapted to focus either one or the other pair of grooves on the longitudinal axis (x).

The invention therefore consisted in providing, in the joining face of each clamping form, two grooves, each intended for bending the profiles in a bending direction, and a rabbet, arranged so that the groove not used during bending "retracted" from the longitudinal axis of bending.

This solution therefore leads to the production of bending machines in two bending directions comprising bending heads of size and design identical to those of current bending machines whose kinematics has a single reference axis.

This design also makes it possible to produce bending angles greater than 180 °, and in particular as a function of the desired maximum value of this bending angle, the pair of grooves formed in the junction face of each clamping shape is advantageously arranged so that the rabbet formed between the insertion faces of said grooves delimits an arc of a circle between 270 degrees and 315 degrees.

According to another advantageous embodiment of the invention for a bending machine comprising two strips arranged upstream of the clamping shapes and adapted to allow the bending of a section respectively by means of the one and the other pairs of grooves, these strips are advantageously mounted on a single carriage associated with means for moving said carriage.

This arrangement of the strips on a single carriage is a very advantageous arrangement leading to a significant simplification of the bending machine. Indeed, the displacement of such strips requires only one guidance and a single servo in advance, instead of the two guides and two drives required for current machines for bending in both directions.

According to another advantageous embodiment of the invention, the rotary drive means of the clamping forms comprise an axial slot formed in each of said clamping forms, and a rotary shaft adapted to extend in these slots, the say lights and rotary shaft having relative rotational locking members.

Furthermore, according to a first advantageous embodiment of the invention for a bending machine comprising two forms of clamping, one of said clamping forms, said fixed, is fixed in translation along the bending axis (z), and the other form of clamping, called mobile, is mounted on translational displacement means of said movable clamping form along the bending axis (z).

Regarding this first embodiment variant, in addition, the rotary shaft is advantageously carried by translation displacement means of said rotary shaft according to the bending axis (z), able to keep it engaged with the two forms. in each of the relative positions of said clamping shapes, and in particular the extreme positions, contiguous and spaced, of the latter.

In addition, in the spaced apart position of the two forms of clamping, the translational displacement means of the rotary shaft according to the bending axis (z) are advantageously adapted, according to the invention, to allow positioning of the latter either in a so-called extended position where said rotary shaft is engaged with the clamping forms, either in a so-called retracted position where said rotary shaft releases, between the two joining faces of said clamping forms, a space adapted to allow the passage the profile for a change of direction of bending.

This arrangement leads to a significant simplification of the movement kinematics of the profiles during changes in the bending direction, since only a displacement along an axis orthogonal to the longitudinal axis (x) is required.

• une forme de serrage dite intermédiaire dotée de deux faces de jonction opposées dites supérieure et inférieure,
• une forme de serrage dite supérieure dotée d'une face de jonction adaptée pour coopérer avec la face de jonction supérieure de la forme de serrage intermédiaire,
• et une forme de serrage dite inférieure dotée d'une face de jonction adaptée pour coopérer avec la face de jonction inférieure de la forme de serrage intermédiaire,
• les rainures et feuillures ménagées dans la forme de serrage supérieure et la face de jonction supérieure de la forme de serrage intermédiaire présentant des dimensions différentes de celles des rainures et feuillures ménagées dans la forme de serrage inférieure et la face de jonction inférieure de la forme de serrage intermédiaire, de façon à permettre le cintrage de profilés de sections différentes,

According to a second advantageous embodiment of the invention for a bending machine comprising three forms of clamping, these three forms of clamping advantageously consist of:

• an intermediate form of clamping provided with two opposite junction faces, said upper and lower,
• a so-called upper form of clamping having a junction face adapted to cooperate with the upper junction face of the intermediate clamping shape,
• and a so-called lower clamping form having a junction face adapted to cooperate with the lower junction face of the intermediate clamping form,
• the grooves and rabbets formed in the upper clamping form and the upper joining face of the intermediate clamping form having dimensions different from those of the grooves and rabbets in the lower clamping form and the lower joining face in the form of intermediate clamping, so as to allow the bending of sections of different sections,

In addition, this bending machine then comprises, in addition, means for relative displacement means for holding the profile and the bending head adapted to position said profile opposite one or the other pair of forms of Tightening.

• une des deux formes de serrage, inférieure ou supérieure, est fixe en translation selon l'axe de cintrage (z),
• et l'arbre rotatif est solidaire en translation de l'autre forme de serrage, supérieure ou inférieure, et est adapté pour amener les trois formes de serrage dans leur position accolée à l'encontre de l'action de moyens élastiques disposés entre les faces de jonction respectives des dites formes de serrage.

With regard to this second variant embodiment, moreover, and advantageously:

• one of the two forms of clamping, lower or upper, is fixed in translation along the bending axis (z),
• and the rotary shaft is integral in translation with the other clamping shape, upper or lower, and is adapted to bring the three clamping shapes in their contiguous position against the action of resilient means arranged between the faces respective junctions of said forms of clamping.

• soit selon un premier sens de cintrage réalisé en utilisant une des deux paires de rainures, par rotation des formes de serrage selon un premier sens de rotation,
• soit selon un second sens de cintrage réalisé en utilisant l'autre paire de rainures, par rotation des formes de serrage selon un sens de rotation inverse du premier sens de rotation.

The invention also relates to a tool for bending a profile around a bending axis (z), comprising at least two forms of clamping having junction faces in which are formed a rectilinear groove and a profiled rebate profiling in the continuity of said groove. According to the invention, the clamping shapes of this tool comprise, formed in each of their junction face, a second rectilinear groove forming with the first rectilinear groove a pair of grooves delimiting, in the contiguous position of the junction faces of two shapes. two clamping ducts between the insertion faces of which extends the winding bearing surface of the profiles (P) formed of two contiguous peripheral rabbets, the arrangement of said grooves and rabbets being adapted so that the bearing surface of the profiles delimits, between the insertion faces of the two clamping ducts, an arc of circle at least equal to 270 degrees capable of allowing the bending of a profile section (P):

• in a first bending direction made using one of the two pairs of grooves, by rotating the clamping shapes in a first direction of rotation,
• or in a second direction of bending made using the other pair of grooves, by rotating the clamping shapes in a direction of rotation opposite the first direction of rotation.

The invention extends, in addition, to a tool as defined above, having taken (s) alone (s) or in combination any of the advantageous features set forth in the text and claims of the present application .

• la figure 1 est une vue en perspective schématique d'un premier mode de réalisation d'une machine à cintrer conforme à l'invention comportant deux formes de serrage,
• la figure 2 est une vue de face, avec des arrachés partiels, de la tête de cintrage de ce premier mode de réalisation, dans la position accolée des deux formes de serrage,
• les figures 3a et 3b sont deux vues de face partielles, avec des arrachés partiels, représentant deux états distincts de la tête de cintrage de ce premier mode de réalisation, dans la position écartée des deux formes de serrage,
• la figure 4 est une vue en perspective d'une forme de serrage selon l'invention,
• la figure 5 est une vue en perspective schématique d'un second mode de réalisation d'une machine à cintrer conforme à l'invention comportant trois formes de serrage,
• la figure 6 est une vue de face, avec des arrachés partiels, de la tête de cintrage de ce second mode de réalisation, dans la position accolée des trois formes de serrage,
• la figure 7 est une vue de face partielle, avec des arrachés partiels, représentant la tête de cintrage de ce second mode de réalisation, dans la position écartée des trois formes de serrage,
• la figure 8 est une vue de face, avec des arrachés partiels comportant notamment un arraché partiel des formes de serrage" de la tête de cintrage d'une variante de réalisation de ce second mode de réalisation, dans la position accolée des trois formes de serrage,
• et les figures 9a à 9d sont quatre schémas représentant le déroulement de deux opérations de cintrage successives réalisées au moyen du premier mode de réalisation de la machine à cintrer selon l'invention.

Other features, objects and advantages of the invention will emerge from the detailed description which follows with reference to the accompanying drawings which show by way of nonlimiting examples two preferred embodiments, as well as an alternative embodiment of the second embodiment. of realization. On these drawings:

• the figure 1 is a schematic perspective view of a first embodiment of a bending machine according to the invention comprising two forms of clamping,
• the figure 2 is a front view, with partial tears, of the bending head of this first embodiment, in the contiguous position of the two forms of clamping,
• the Figures 3a and 3b are two partial front views, with partial tears, representing two distinct states of the bending head of this first embodiment, in the spaced apart position of the two forms of clamping,
• the figure 4 is a perspective view of a form of clamping according to the invention,
• the figure 5 is a schematic perspective view of a second embodiment of a bending machine according to the invention comprising three forms of clamping,
• the figure 6 is a front view, with partial tears, of the bending head of this second embodiment, in the contiguous position of the three forms of clamping,
• the figure 7 is a partial front view, with part broken away, showing the bending head of this second embodiment, in the spaced apart position of the three forms of clamping,
• the figure 8 is a front view, with partial snatch including in particular a partial snatch of the clamping shapes "of the bending head of an alternative embodiment of this second embodiment, in the contiguous position of the three clamping shapes,
• and the Figures 9a to 9d are four diagrams showing the progress of two successive bending operations performed by means of the first embodiment of the bending machine according to the invention.

The bending machines according to the invention shown by way of example in the figures consist of bending machines, in two bending directions, a profile P carried by displacement means of any type known per se, schematized in D, suitable moving said profile along a horizontal displacement axis (x).

It should be noted that, to simplify the detailed description which follows, the bending machines are described in their usual position of use in which, in particular, the bending axis (z) is a vertical axis and the axis of displacement (x) a horizontal axis. Therefore, the terms vertical, horizontal ... refer to such a position.

The bending machine with two forms of clamping shown in FIG. figure 1 , comprises, in the first place, a frame 1 comprising a vertical front plate 2.

This bending machine comprises a first carriage 3 arranged to slide horizontally along a horizontal axis Y relative to the frame 1, and comprising a vertical table 4 provided with horizontal slides such as 5 adapted to cooperate with horizontal rails such as 6 formed on the plate frontal 2 of the frame 1.

This first carriage 3 comprises, in addition, an upper horizontal table 7 on which is slidably mounted in translation along the horizontal axis Y, a second carriage 8 having a horizontal plate 9 on the underside of which are arranged horizontal rails such as 10 arranged to slide in slides such as 11 formed on said upper table 7 of the first carriage 3.

This second carriage 8 also comprises two parallel plates 12, 13 extending vertically on the horizontal plate 9, each endowed, towards their upper end, with a slide 14 arranged to extend horizontally along an axis X perpendicular to the axis Y and therefore parallel to the axis (x) of displacement of the profile P.

Each of these slides 14 is adapted to house a sliding rail 15 supporting a guide strip 16, 17 of conventional type, that is to say having a longitudinal groove for supporting and guiding the section to be bent.

The bending machine shown in figure 1 comprises, in addition, a bending tool disposed at the front of the second carriage 8 and adapted to cooperate with one or the other guide bar 16, 17 to allow bending in two bending directions.

This tooling consists of two forms of clamping 18, 19 oriented on a vertical bending axis (z), having the form of discs having planar joining faces 18a, 19a extending in perpendicular horizontal planes (X, Y). at said bending axis, on the periphery of which are provided two rectilinear grooves of longitudinal axis perpendicular to the bending radius, respectively 20a, 21a for the clamping form 18, and 20b, 21b for the clamping form 19, between which extends a peripheral rebate, respectively 22a, 22b.

These grooves 20a, 20b, 21a, 21b and rebates 22a, 22b are, firstly, adapted so that, in the contiguous position of the junction faces 18a, 19a of the two clamping shapes 18, 19, two adjacent grooves 20a 20b, 21a-21b delimit a clamping duct of a profile P, and contiguous rabbets 22a-22b define a bearing surface of said winding profile.

• soit selon un premier sens de cintrage réalisé en utilisant une des deux paires de rainures 20a- 20b, par rotation des formes de serrage 18, 19 selon un premier sens de rotation,
• soit selon un second sens de cintrage réalisé en utilisant l'autre paire de rainures 21 a- 21 b, par rotation des formes de serrage 18, 19 selon un sens de rotation inverse du premier sens de rotation

In addition, the arrangement of said grooves and rabbet is adapted to allow, in combination with one or the other strip 16, 17, the bending of a profile section P:

• in a first direction of bending made using one of the two pairs of grooves 20a-20b, by rotation of the clamping forms 18, 19 in a first direction of rotation,
• in a second direction of bending made using the other pair of grooves 21 a-21 b, by rotation of the clamping forms 18, 19 in a direction of rotation opposite to the first direction of rotation

In the example shown, and for the purposes of fulfilling the aforementioned functions, the faces F20, F21 for introducing the profiles P of the two grooves 20a, 21a or 20b, 21b formed on a tightening form 18 or 19 (that is, say the faces of these grooves between which the rebate 22a or 22b extends, delimit between them an angle α equal to 270 °, which can extend up to 315 °.

Each clamping piece 18, 19 is further axially pierced by a circular axial slot 23 in which grooves 24 are formed.

• être déplacées relativement en translation selon l'axe de cintrage (z), entre une position écartée des faces de jonction 18a, 19a, d'introduction et de retrait d'un profilé P, et une position accolée de cintrage du dit profilé,
• être entraînées simultanément en rotation dans la position accolée des faces de jonction 18a, 19a.

These clamping forms 18, 19 are further adapted to:

• be moved relatively in translation along the bending axis (z), between a position spaced apart from the junction faces 18a, 19a, of insertion and withdrawal of a profile P, and an adjoining bending position of said profile,
• be driven simultaneously in rotation in the contiguous position of the junction faces 18a, 19a.

For this purpose, and in the first place, the lower clamping form 19 is mounted fixed in translation along the bending axis (z), and rests on a fixed horizontal friction ring 25.

• dans sa position déployée, pour exercer une force de serrage maintenant accolées les faces de jonction 18a, 19a des formes de serrage 18, 19,
• et dans sa position rétractée, pour maintenir les deux formes de serrage 18, 19 dans leur position écartée, en vue de l'introduction ou du retrait d'un profilé P, ou tel que décrit ci-dessous, en vue du changement du sens de cintrage.

The upper clamping form 18 is in turn mounted to move in translation along the bending axis (z), and for this purpose, it is mounted, with the interposition of a bearing 28, under the lower end of a rod 26a arranged vertically of a jack 26 whose body is secured to a bracket 27 extending above the upper table 7 of the first carriage 3, said jack being adapted:

• in its deployed position, to exert a clamping force now contiguous junction faces 18a, 19a of the clamping forms 18, 19,
• and in its retracted position, to hold the two clamping forms 18, 19 in their spaced apart position, in order to the introduction or removal of a profile P, or as described below, for changing the direction of bending.

The rotational drive means of the two clamping forms 18, 19 comprise, in turn, a vertical shaft 29 adapted to extend along the bending axis (z), engaged in the slots 23, and provided with ribs 30 conjugées splines 24, said shaft being rotated by a geared motor assembly 31 a-31 b carried by the first carriage 3 between the upper table 7 and a horizontal lower table 32 thereof.

• dans sa position déployée, pour maintenir l'arbre rotatif 29 en prise avec les deux formes de serrage 18, 19 dans chacune des positions relatives des dites formes de serrage, et notamment les positions extrêmes, accolée et écartée, de ces dernières, représentées aux figures 2 et 3a,
• et dans sa position rétractée, et dans la position écartée des deux formes de serrage 18, 19, pour permettre de positionner l'arbre rotatif 29 dans une position de retrait où, tel que représenté à la figure 3b, le dit arbre rotatif libère, entre les deux faces de jonction 18a, 19a des dites formes de serrage, un espace adapté pour permettre le passage du profilé P en vue d'un changement du sens de cintrage.

In addition, the rotary shaft 29 is integral in translation with the rod 33a arranged vertically of a jack 33 whose body is disposed on the lower table 32 of the first carriage 3, said jack being adapted:

• in its deployed position, to keep the rotary shaft 29 engaged with the two clamping forms 18, 19 in each of the relative positions of said clamping forms, and in particular the extreme positions, contiguous and spaced apart, of the latter, shown in FIGS. figures 2 and 3a ,
• and in its retracted position, and in the spaced apart position of the two clamping forms 18, 19, to allow the rotary shaft 29 to be positioned in a retracted position where, as shown in FIG. figure 3b , said rotary shaft releases, between the two junction faces 18a, 19a of said clamping forms, a space adapted to allow the passage of the profile P for a change of the direction of bending.

According to this principle, the rotary shaft 29 has the function of indexing the relative rotational position of the two clamping shapes 18, 19, while occasionally allowing, in the spaced apart position of the clamping forms 18, 19, to move the first carriage 3 along the axis of displacement Y in order to change the direction of bending of the section P.

The bending machine shown in figure 5 is a bending machine with three forms of clamping, not only adapted to allow the bending of profiles in two directions of bending, but also to allow the bending of two profiles P of different sections.

This bending machine comprises, in the first place, a frame 41 comprising a vertical faceplate 42.

This bending machine further comprises a first carriage 43 arranged to slide vertically along a vertical axis Z relative to the frame 41, and consisting of a vertical table 43 having vertical rails such as 44 adapted to slide in vertical rails such as 45 extending on the front plate 42 of the frame 41.

• ■ d'une table verticale 47 agencée pour coulisser horizontalement selon un axe vertical Y relativement au premier chariot 43, et dotée, à cet effet, de glissières horizontales telles que 48 à l'intérieur desquelles coulissent des rails horizontaux tels que 49 s'étendant sur le premier chariot 43,
• ■ et d'une table supérieure horizontale 50 sur la portion avant de laquelle sont disposés des glissières horizontales telles que 54 s'étendant selon l'axe Y.

This bending machine also comprises a second carriage 46 having the general shape of a compound square:

• ■ a vertical table 47 arranged to slide horizontally along a vertical axis Y relative to the first carriage 43, and provided, for this purpose, horizontal rails such as 48 within which slide horizontal rails such as 49 extending on the first carriage 43,
• And a horizontal upper table 50 on the front portion of which are arranged horizontal slides such as 54 extending along the Y axis.

This bending machine also comprises a third carriage 51 arranged to slide horizontally along the horizontal axis Y relative to the upper table 50 of the second carriage 46, and comprising a horizontal plate 52 on the underside of which are arranged horizontal rails such as 53 arranged to slide in the slides 54 formed on the upper table 50 of the second carriage 46.

This third carriage 51 also comprises two parallel plates 55, 56 extending vertically on the horizontal plate 52, each endowed, towards their upper end, with a slide 57 arranged to extend horizontally along an axis X perpendicular to the axis Y and therefore parallel to the axis (x) of displacement of the profile P.

Each of these slides 57 is adapted to house a sliding rail 58 supporting a guide strip 59, 60, each of said strips having two superimposed grooves such as 60a, 60b of different sections adapted to accommodate profiles of different sections.

• une forme de serrage intermédiaire 62 dotée de deux faces de jonction opposées : une face de jonction supérieure 65a et une face de jonction inférieure 66a,
• une forme de serrage supérieure 63 dotée d'une face de jonction inférieure 63a adaptée pour coopérer avec la face de jonction supérieure 65a de la forme de serrage intermédiaire 62,
• et une forme de serrage inférieure 64 dotée d'une ace de jonction supérieure 64a adaptée pour coopérer avec la face de jonction inférieure 66a de la forme de serrage intermédiaire 62.

The tooling of this bending machine consists of three clamping shapes 62, 63, 64 of identical design to that of the clamping forms 18, 19 described above, that is to say the clamping forms of which each face of junction has two rectilinear grooves longitudinal axis perpendicular to the bending radius between which extends a peripheral rebate. These forms of tightening consist of:

• an intermediate clamping form 62 having two opposite junction faces: an upper junction face 65a and a lower junction face 66a,
• an upper clamping form 63 having a lower junction face 63a adapted to cooperate with the upper junction face 65a of the intermediate clamping form 62,
• and a lower clamping form 64 having an upper joint ace 64a adapted to cooperate with the lower joint face 66a of the intermediate clamping form 62.

In addition, the grooves such as 67a, 67b and the grooves 68a, 68b formed in the junction face 63a of the upper clamping shape 63 and the upper junction face 65a of the intermediate clamping shape 62 having dimensions different from those of grooves such as 69a, 69b and the grooves 70a, 70b formed in the junction face 64a of the lower clamping form 64 and the lower junction face 66a of the intermediate clamping form 62, so as to allow the bending of sections P of different sections.

• être déplacées relativement en translation selon l'axe de cintrage (z), entre une position écartée des faces de jonction 63a-65a, 64a-66a, d'introduction et de retrait d'un profilé P, et une position accolée de cintrage du dit profilé,
• être entraînées simultanément en rotation dans la position accolée des faces de jonction 63a-65a, 64a-66a.

As previously, these three forms of clamping 62-64 are suitable for:

• relatively displaced in translation along the axis of bending (z), between a position spaced apart from the junction faces 63a-65a, 64a-66a, of introduction and withdrawal of a profile P, and an adjoining bending position of the said profile,
• be driven simultaneously in rotation in the contiguous position of the junction faces 63a-65a, 64a-66a.

For this purpose, and firstly, the lower clamping form 64 is fixedly mounted in translation along the bending axis (z), and rests on a fixed horizontal friction ring 71.

In addition, resilient means such as two helical springs 72, 73 are interposed between the respective junction faces 63a-65a, 64a-66a of the clamping shapes, so as to urge a displacement of the intermediate clamping shapes 62 and 63 towards the their position aside.

• d'une extrémité supérieure comportant un organe, en l'exemple constitué d'un écrou 76, de limitation de la translation de la forme de serrage supérieure 63,
• d'une extrémité inférieure solidaire en translation de la tige 78a agencée verticalement d'un vérin 78 dont le corps est disposé sur la table inférieure d'un étrier 79 relié à la table supérieure 50 du deuxième chariot 46, le dit vérin étant adapté :
  • dans sa position déployée, pour autoriser le déplacement des formes de serrage intermédiaire 62 et supérieure 63 vers leur position écartée sous l'action des ressorts 72, 73,
  • et dans sa position rétractée, pour exercer une force de serrage maintenant accolées les faces de jonction 63a-65a, 64a-66a des formes de serrage 62-64.

The holding 62-64 clamping forms in their contiguous position is, in turn, provided by means of a vertical shaft 74 adapted to extend along the bending axis (z), engaged in the lights 23 formed in said forms of clamping, and provided with ribs 75 conjugées splines 24, said shaft being endowed with:

• an upper end comprising a member, in the example consisting of a nut 76, for limiting the translation of the upper clamping form 63,
• a lower end integral in translation of the rod 78a arranged vertically of a jack 78 whose body is disposed on the lower table of a stirrup 79 connected to the upper table 50 of the second carriage 46, said jack being adapted:
  • in its deployed position, to allow the displacement of the intermediate clamping forms 62 and upper 63 to their spaced position under the action of the springs 72, 73,
  • and in its retracted position, to exert a clamping force now contiguous the junction faces 63a-65a, 64a-66a of the clamping forms 62-64.

In addition, this shaft 74 is rotated by a motorcycle gear unit 77a, 77b carried by the second carriage 46 under the upper table 50 thereof.

According to this principle, the rotary shaft 74 has the function of indexing the relative rotational position of the three clamping shapes 62-64, and of maintaining the said clamping forms in their contiguous position against the action of elastic means 72, 73.

It should also be noted that according to this second embodiment, the change of the bending direction takes place thanks to the ability to move along the Y and Z axes of the tooling relative to the P-profile.

The figure 8 represents a variant of this second embodiment in which, in the first place, the third carriage 51 carries a single vertical plate 80 whose upper end forms a horizontal rail 84 extending along the axis X.

• dans des plans parallèles au plan (X, Z), deux faces verticales opposées 82, 83 dans chacune desquelles sont ménagées deux gorges superposées, respectivement 82a-82b, 83a-83b, de sections différentes adaptées pour loger des profilés de sections différentes,
• une face inférieure dans laquelle est ménagée une glissière 85 adaptée pour loger le rail 84.

In addition, according to this variant the two strips are made from a single rectangular block parallelepipedic 81 machined so as to have:

• in planes parallel to the plane (X, Z), two opposite vertical faces 82, 83 in each of which are arranged two superimposed grooves, respectively 82a-82b, 83a-83b, of different sections adapted to house profiles of different sections,
• a lower face in which is provided a slide 85 adapted to house the rail 84.

In this embodiment, the strips 82, 83 are formed on a single block 81 carried by a single carriage 80 whose movement requires only one guidance and only one feed control, instead of the two guides and the two servocontrols required for current machines allowing bending in both directions.

It should be noted that this variant can also be implemented on a bending machine according to the first embodiment by providing this machine means for moving the first carriage 3 along a Z axis of movement.

The Figures 9a to 9d illustrate the operation of a bending machine as shown in FIG. figure 1 when bending a profile P equipped with a nut E at its end.

First, the angular position of the clamping forms 18, 19 is indexed so as to coincide with the axis (x) the longitudinal axis of the pair of grooves, in the example grooves 21a-21b, suitable for the selected bending direction ( figure 9a ).

The bending is then performed, in association with the corresponding strip 17, by rotation of the two forms of clamping 18, 19 around the bending axis (z), in the contiguous position of said clamping shapes ( figure 9b ):

As represented in Figures 9c and 9d the following bending, made in a reverse bending direction, is effected in the same way using the other pair of grooves, in the example grooves 20a, 20b in association with the other strip 16, and leads, in the example, to achieve a bending angle greater than 180 °.

This illustration highlights one of the essential advantages of the bending machine according to the invention, namely the possibility of producing, in both bending directions, bending angles greater than 180 °.

Claims (10)

1. Tooling for bending a profile section about an axis of bending (z), comprising at least two clamping forms (18, 19; 62-64) centred on the axis of bending (z), having the form of discs comprising planar meeting faces (18a, 19a; 63a, 64a, 65a, 66a) extending in planes perpendicular to the said axis of bending, in which faces there are formed a straight groove (20a, 20b; 67a, 67b, 69a, 69b) the longitudinal axis of which is perpendicular to the bend radius, provided with an end face (F20) for introducing a profile section (P), and a peripheral rebate (22a, 22b; 68a, 68b, 70a, 70b) running in the continuation of the introducing face (F20) of the said groove, the said groove and rebate being designed so that, when the meeting faces (18a, 19a; 63a, 64a, 65a, 66a) of two clamping forms (18, 19; 62-64) are in the brought-together position, two brought-together grooves (20a-20b; 67a-67b, 69a-69b) delimit a passage for clamping a profile section (P) provided with an end face (F20) for introducing the said profile section, and the brought-together rebates (22a-22b; 68a-68b, 70a-70b) define, in the continuation of the said introducing face, a bearing surface on which the said profile section is wound, the said bending tooling being characterized in that the clamping forms (18, 19; 62-64) comprise, formed in each of their meeting faces (18a, 19a; 63a, 64a, 65a, 66a), a second straight groove (21a, 21b; 67a, 67b, 69a, 69b) which, with the first straight groove (20a, 20b; 67a, 67b, 69a, 69b), forms a pair of grooves which, when the meeting faces (18a, 19a; 63a, 64a, 65a, 66a) of two clamping forms (18, 19; 62-64) are in the brought-together position, delimit two clamping passages between the introducing faces (F20, F21) of which there extends the bearing surface on which the profile sections (P) are wound, this surface being formed of the two brought-together peripheral rebates (22a, 22b; 68a, 68b, 70a, 70b), the said grooves and rebates being laid out in such a way that the bearing surface on which the profile section is wound delimits, between the introducing faces (F20, F21) of the two clamping passages, a circular arc (α) measuring at least 270° and able to allow a length of profile section (P) to be bent:

   - either in a first direction of bending performed using one of the two pairs of grooves (20a, 20b) by rotating the clamping forms (18, 19; 62-64) in a first direction of rotation,

   - or in a second direction of bending performed by using the other pair of grooves (21a, 21b) by rotating the clamping forms (18, 19; 62-64) in a direction of rotation that is the opposite of the first direction of rotation.
2. Machine for bending a profile section (P) comprising means (D) for holding and moving the profile section along a longitudinal axis of movement (x), and a rotary bending head able to rotate about an axis (z) known as the axis of bending, and comprising:

   • a tooling consisting of at least two clamping forms according to Claim 1,

   • means (26; 72, 73, 74, 78) of causing the relative translational movement of the clamping forms (18, 19; 62-64) along the axis of bending (z) and capable of moving them between a parted position for introducing and removing a profile section (P) and a brought-together position for bending the said profile section,

   • and rotational drive means (29, 31a, 31b; 74, 77a, 77b) capable of simultaneously rotating the clamping forms (18, 19; 62-64) when the latter are in their brought-together position,
   the said bending machine being characterized in that it comprises means (3, 5, 6; 46, 48, 49) of causing the relative movement of the holding means (D), of the profile section (P) and of the bending head, which means are designed to centre either the one pair of grooves (20a-20b) or the other pair of grooves (21a-21b) on the longitudinal axis (x).
3. Bending machine according to Claim 2, characterized in that the pair of grooves (20a-21a, 20b-21b; 67a, 67b, 69a, 69b) formed in the meeting face (18a, 19a; 63a, 64a, 65a, 66a) of each clamping form (18, 19; 62-64) is arranged in such a way that the rebate (22a, 22b; 68a, 68b, 70a, 70b) formed between the introducing faces (F20, F21) of the said grooves delimits a circular arc (α) of between 270° and 315°.
4. Bending machine according to either of Claims 2 and 3, comprising two strips (82, 83) positioned upstream of the clamping forms (62-64) and designed to allow a profile section (P) to be bent by means of each of the pairs of grooves (67a, 67b, 69a, 69b) respectively, characterized in that the said strips are mounted on a single carriage (51, 80) associated with means (53, 54, 84, 85) of moving the said carriage.
5. Bending machine according to one of Claims 2 to 4, characterized in that the rotational drive means for the clamping forms (18, 19; 62-64) comprise an axial slot (23) formed in each of the said clamping forms, and a rotary shaft (29; 74) designed to extend into these slots (23), the said slots and rotary shaft having mating components (24, 30; 24, 75) for preventing their relative rotation.
6. Bending machine according to Claim 5, comprising two clamping forms (18, 19), characterized in that one of the said clamping forms (19), termed the fixed clamping form, is fixed in terms of translation along the axis of bending (z), and in that the other clamping form (18), termed the moving clamping form, is mounted on means (26) of causing the translational movement of the said moving clamping form along the axis of bending (z).
7. Bending machine according to Claims 5 and 6 considered in combination, characterized in that the rotary shaft (29) is borne by means (33) of causing the translational movement of the said rotary shaft along the axis of bending (z), which means are able to keep the rotary shaft in engagement with the two clamping forms (18, 19) in each of the relative positions of the said clamping forms, notably the extreme, brought-together and parted, positions thereof.
8. Bending machine according to Claim 7, characterized in that, when the two clamping forms (18, 19) are in the parted position, the means (33) of causing the translational movement of the rotary shaft (29) along the axis of bending (z) are designed to allow this shaft to be positioned either in a position known as the deployed position in which the said rotary shaft is in engagement with the clamping forms (18, 19) or in a position known as the retracted position in which the said rotary shaft opens up, between the two meeting faces (18a, 19a) of the said clamping forms, a space designed to allow the passage of the profile section (P) so that the direction of bending can be changed.
9. Bending machine according to one of Claims 2 to 5, characterized in that it comprises:

   • three clamping forms (62-64) consisting of:

   - a clamping form (62) known as the intermediate clamping form provided with two opposing meeting faces (65a, 66a) known as the upper and lower meeting faces,

   - a clamping form (63) known as the upper clamping form provided with a meeting face (63a) designed to collaborate with the upper meeting face (65a) of the intermediate clamping form (62),

   - and a clamping form (64) known as the lower clamping form provided with a meeting face (64a) designed to collaborate with the lower meeting face (66a) of the intermediate clamping form (62),

   - the grooves (67a, 67b) and rebates (68a, 68b) formed in the upper clamping form (63) and the upper meeting face (65a) of the intermediate clamping form (62) having dimensions that differ from those of the grooves (69a, 69b) and rebates (70a, 70b) formed in the lower clamping form (64) and the lower meeting face (66a) of the intermediate clamping form (62), so as to allow profile sections (P) of different cross sections to be bent,

   • means (43-45) of causing the relative movement of the holding means (D) of the profile section (P) and of the bending head which means are designed to position the said profile section facing one or the other pair of clamping forms (62-64).
10. Bending machine according to Claims 5 and 9 considered in combination, characterized in that:

    • one of the two, lower or upper clamping forms (64) is fixed in terms of translation along the axis of bending (z),

    • the rotary shaft (74) moves as one in translational movement with the other, upper or lower, clamping form (63) and is designed to bring the three clamping forms (62-64) into their brought-together position against the action of elastic means (72, 73) arranged between the respective meeting faces of the said clamping forms.

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