• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
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    • 专利摘要:
    The invention relates to a folding machine (9) for forming a corrugation (2) in a metal sheet (1) for the construction of a sealed membrane of a fluid storage tank, the folding machine (9). comprising: - a lower frame (11); a lower matrix having an imprint; - an upper frame (10) having an upper punch (12); - the folding machine (9) further comprising first and second fingers (35, 36) respectively arranged on either side of the upper punch (12), each of the first and second fingers (35, 36) having a lower end directed towards the lower frame (11) and being pivotally mounted on the upper frame (10), along an axis of rotation (37) parallel to the longitudinal axis of the corrugation to be formed, between a rest position and a working position.
    公开号:FR3057185A1
    申请号:FR1659655
    申请日:2016-10-06
    公开日:2018-04-13
    发明作者:Olivier Perrot；Anthony DE FARIA；Thomas CONEJERO；Frederic Goslis；Mohamed SASSI
    申请人:Gaztransport et Technigaz SARL；
    IPC主号:
    专利说明:

    Technical area
    The invention relates to a folding machine for forming a corrugation in a metal sheet.
    A metal sheet obtained by means of such a folding machine is in particular intended for the construction of a waterproof membrane of a fluid storage tank. Also, the invention also relates to the field of tanks, sealed and thermally insulating, with membranes, for the storage and / or transport of fluid, such as a cryogenic fluid.
    Technological background
    Document WO2015170054 discloses a folding machine for forming, in a metal sheet having a preformed corrugation, a corrugation perpendicular to said preformed corrugation. The folding machine comprises a lower die comprising a first and a second die element each having a support surface of its metal sheet and a concave half-cavity, the first and second die elements each being slidably mounted on a lower frame , in a direction x perpendicular to the direction of the ripple to be formed, so that it can slide between a separated position and a close position. In the above-mentioned close position, the half-impressions of the first and second matrix elements together define an impression corresponding to the shape of the corrugation to be formed. The folding machine further includes an upper punch which is movable relative to the lower frame and has a shape complementary to that of the imprint. In addition, a first and a second sidewall which extend on either side of the upper punch, respectively opposite the first and the second die element, are slidably mounted in ia direction x, between a separated position and a close position.
    In operation, when the metal sheet is clamped between the blanks and the matrix elements, the displacement of the upper punch from its rest position to its folding position results in a folding of the metal sheet during which the metal sheet transmits a tensile force in the direction x to the matrix elements and to the sidewalls and ies thus moves towards their close position.
    ίί has been found that, due to a phenomenon of elastic return, the metal sheets obtained by means of such a folding machine had flatness defects. In other words, its flat areas of the sheet metal, arranged between the corrugations do not extend in one and the same plane.
    Such a folding machine is therefore not entirely satisfactory.
    summary
    An idea underlying the invention is to provide a folding machine to form a corrugation in a metal sheet which makes it possible to ensure the flatness of the metal sheet thus obtained.
    According to one embodiment, the invention provides a folding machine for forming a corrugation in a metal sheet intended for the construction of a sealed membrane of a fluid storage tank, the folding machine comprising:
    - a lower frame;
    - A lower die comprising a first and a second die element each having a bearing surface of the metal sheet and a concave half-cavity, the first and second die elements each being movably mounted on the lower frame, transversely to a longitudinal direction of the corrugation to be formed, between a spread position and a close position, the half-impressions of the first and second matrix elements together defining the imprint corresponding to the shape of the corrugation to be formed when the first and second matrix elements are in their close position;
    an upper frame comprising an upper punch, arranged above the lower die, and comprising a lower end provided with a head having a shape complementary to that of the cavity, the upper frame being movable vertically relative to the lower frame between a rest position and a folding position in which its head of said upper punch is engaged inside the imprint of its lower die so as to press the metal sheet;
    - The folding machine being configured so that its matrix elements move from their spaced direction to their close position when the upper frame is moved from its rest position to its folding position;
    the folding machine further comprising a first and a second finger respectively disposed on either side of the upper punch, each of the first and second fingers comprising a lower end directed towards the lower frame and being pivotally mounted on the upper frame, along an axis of rotation parallel to the longitudinal axis of the corrugation to be formed, between a rest position and a working position; the lower end of the first and second fingers having a contact zone intended to cooperate with the metal sheet, said contact zones moving upwardly relative to the upper frame, approaching one another during pivoting first and second fingers from their rest position to their working position; said first and second fingers each being returned to their rest position by a return member;
    - said first and second fingers being arranged such that:
    - when the upper frame moves from its rest position to its folding position, the first and second fingers tighten the metal sheet against the bearing surface of the first and second matrix elements and move from their rest position towards their working position, under the effect of the displacement of the first and second matrix elements towards their close position, the displacement of the first and second fingers from their rest position towards their working position constraining the return member so that the first and second fingers exert in reaction on the metal sheet an effort having the effect of forcing the metal sheet towards the first and the second matrix elements; and
    - during the movement of the upper frame from its folding position to its rest position, said first and second fingers move from their working position to their rest position under the effect of the return member.
    Thus, the forces exerted by the fingers on the metal sheet during the displacement of the upper frame in the direction of its working position make it possible to locally constrain the metal sheet at the foot of the corrugation so as to locally create plastic deformation. This makes it possible to oppose the elastic return of the metal sheet and therefore to significantly improve its flatness of the metal sheet thus bent.
    According to embodiments, such a folding machine can include one or more of the following characteristics.
    According to one embodiment, the folding machine comprises stop elements capable of limiting the movement of the first and second fingers under the effect of the return member and thus defining the rest position of said first and second fingers, the stop elements being adjustable so as to allow an adjustment of the rest position of said first and second fingers.
    According to an alternative embodiment, each stop element has a threaded bore and a threaded screw which is inserted through said threaded bore; said threaded screw having one end projecting towards one of the first and second fingers and constituting a stop surface.
    According to one embodiment, the first and second fingers are respectively pivotally mounted on a first and a second support element; the first and second support elements being respectively fixed on a first and a second lateral face of the upper punch.
    According to one embodiment, each return member is a helical spring which is a support on the one hand against one of the lateral faces of the upper punch and on the other hand against one of the first and second fingers.
    According to one embodiment, the lower end of the first and second fingers has a flat lower face; the contact area being formed on a first edge of the lower face which is oriented in its longitudinal direction of the wave to be formed and which is adjacent to the upper punch; said first and second fingers being arranged such that the inclination of their lower face with respect to a horizontal plane decreases during the movement of the first and second fingers from their rest position to their working position.
    According to one embodiment, the first and second matrix elements are each slidably mounted in a direction transverse to the longitudinal direction of the corrugation to be formed on the lower frame between their separated position and their close position.
    According to one embodiment, the first and second matrix elements are returned to their separated position by a return member.
    According to one embodiment, the folding machine further comprises a first and a second sidewall extending on either side of the upper punch, above the lower die, respectively opposite the first and second matrix elements, said first and second wall clamps being slidably mounted, in a direction transverse to the longitudinal direction of the corrugation to be formed, between a close position and a separated position; the first and second flank clamps being movable vertically relative to the lower frame between a relaxed position and a clamping position in which the first and second flank clamps are brought closer respectively to the bearing surface of the first die element and of the second die element so as to clamp the metal sheet against the bearing surface of the first and second die elements.
    According to one embodiment, the first and second sidewall clamps are returned to their separated position by a return member.
    According to one embodiment, the first and second flank clamps are slidably mounted vertically respectively on a first and a second support plates; said first and second support plates being slidably mounted in a direction transverse to the longitudinal direction of the corrugation to be formed on the upper frame in order to allow the movement of the greenhouse flanks between their close position and their separated position; each sidewall being recalled at a distance from its respective support plate by return members.
    According to one embodiment, the return members exerting a return force between each sidewall and its respective support plate are springs, gas cylinders, hydraulic cylinders or pneumatic cylinders.
    According to one embodiment, the folding machine is intended to form the corrugation perpendicular to a preformed corrugation in its metal sheet; the folding machine further comprising:
    - two knives intended for its deformation of the preformed corrugation on either side of a crossover zone between the preformed corrugation and the corrugation to be formed, the two knives being mounted movable on the lower frame between a low position and a high folding position of the preformed corrugation.
    According to one embodiment, each of the two knives has a blade which is directed towards the upper frame and which extends parallel to the longitudinal direction of the corrugation to be formed, the blade of said knives having a central portion and two lateral portions arranged on either side of the central portion in said longitudinal direction; the central portion projecting towards the upper frame, beyond the two lateral portions. Thus, each of the knives household in the preformed corrugation a corrugation comprising a fold line which has a concavity directed in a direction opposite to the concavity of the preformed corrugation, which also contributes to ensuring the pananeity of the metal sheet.
    According to one embodiment, the folding machine comprises two contact parts which are each mounted movable vertically on the lower frame and which have a bearing surface positioned between the half-impressions of the first and second matrix elements so that that the metal sheet is pinched between the bearing surface of each contact piece and the upper punch and that said contact pieces are moved in the direction of the lower frame during the movement of the upper frame from its rest position to its folding position ;
    the folding machine further comprising a knife actuation device comprising a movement transmission mechanism which is arranged to transmit a movement between the contact parts and its knives so that the knives are moved to their upper position folding during the movement of the upper punch from its rest position to its folding position.
    According to one embodiment, the knives are each slidably mounted, in a direction transverse to the longitudinal direction of the corrugation to be formed, on a support member between a separated position and a close position; the support member being mounted vertically movable on the lower frame; Knives actuation device comprising two levers which are each mounted articulated on the lower frame and each have a first end cooperating with one or the other of the two contact parts so as to cause the levers to pivot during movement from the upper punch from its rest position to its folding position and a second end; Its second ends of the levers cooperating with the support member so as to move said support member vertically and thus move the knives from their low position to their high folding position. Come out of the pivoting of the levers caused by a movement of the upper frame of its rest position to its folding position.
    According to one embodiment, the levers are pivotally mounted around horizontal axes of rotation oriented in a direction transverse to the longitudinal direction of the corrugation to be formed.
    According to one embodiment, its levers are symmetrical with respect to the vertical plane of symmetry. Thus, the levers pivot in opposite directions of rotation which ensures a balancing of the forces.
    According to one embodiment, each of the knives is carried by a carriage mounted to slide on a guide rail which is fixed to the support member and extends in the transverse direction.
    According to one embodiment, the folding machine comprises one or more return members arranged to return each of the knives to their separated position.
    According to one embodiment, the folding machine comprises assistance means capable of assisting the movement of the first and second die elements towards the close position; said means of assistance comprising:
    - a first and a second arm which are each pivotally mounted on the lower frame around a respective axis of rotation and each has a first end arranged to be moved when the upper punch is moved from its rest position to its folding position so that the first and second arms pivot when the upper punch moves from its rest position to its folding position and a second end fitted with a cam follower;
    the cam followers of the first and second arms being able to cooperate with a cam surface carried respectively by the first and the second matrix elements; the cam followers and the cam surfaces being arranged so that, during a pivoting of the first and second arms driven by the displacement of the upper punch from its rest position towards its folding position, each cam follower exerts on the respective cam surface, carried by the first or the second die element, a force tending to move said die element in a direction transverse to the longitudinal direction of the ripple to be formed towards its close position. Thus, thanks to such assistance means, the movement of the matrix elements is synchronized with that of the upper punch and does not require a dedicated actuator.
    According to one embodiment, its axes of rotation of the first and second arms are horizontal and parallel to the longitudinal direction of the corrugation to be formed.
    According to one embodiment, the assistance means comprise a contact piece which is mounted vertically movable on the lower frame and which has a bearing surface positioned between the half-impressions of the first and second matrix elements so that that the metal sheet is pinched between the bearing surface of the contact piece and the upper punch and that said contact piece is moved towards the lower frame during the movement of the upper punch from its rest position to its folding position ; said contact piece being in abutment against the first end of each of the first and second arms in such a way that the first and the second arm pivot during the movement of the upper punch from its rest position to its folding position. According to an equivalent embodiment, each arm cooperates with a respective contact piece.
    According to one embodiment, the contact surface of the contact piece is flush with its contact surface of the first and second die elements when the upper punch is in its rest position.
    According to one embodiment, the first end of each of the first and second arms comprises a roller mounted idly against îequei is in abutment on a cam surface of its contact piece.
    According to one embodiment, the folding machine is intended to form a corrugation in a metal sheet comprising a preformed corrugation extending in a direction perpendicular to the corrugation to be formed, the first and the second matrix elements each comprising a groove V-shaped, intended to receive said preformed corrugation.
    According to one embodiment, the side clamps each comprise a male element, projecting in the direction of the lower frame, having a V shape which is capable of being introduced into the groove of the matrix element opposite. -screw, when the side clamps are in their tightening position.
    According to one embodiment, the head of the upper punch comprises a lug projecting from the head in the direction of the lower frame and disposed opposite the zone of intersection between the cavity and the grooves of the first and second elements of matrix.
    According to one embodiment, the invention also provides a method of using the above-mentioned folding machine, comprising:
    - The positioning of a metal sheet bearing against the bearing surfaces of the first and second matrix elements; and
    - The displacement of the upper frame from its rest position to its folding position so as to form an undulation in the metal sheet.
    Brief description of the figures
    The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly during the following description of several particular embodiments of the invention, given solely by way of illustration and without limitation. , with reference to the accompanying drawings.
    - Figure 1 is a partial perspective view of the folding machine in a rest position, one of the matrix elements and one of the blanks being only partially shown.
    - Figure 2 is a partial perspective view of the folding machine, similar to that of Figure 1, in which the folding machine is shown in a folding position
    - Figure 3 is a partial front view of the folding machine in the rest position.
    - Figure 4 is a partial front view of the folding machine in the folding position.
    - Figure 5 is a partial front view of the upper punch in which one of the fingers is shown in its rest position while the other finger is not shown.
    FIG. 6 is a perspective view of the upper punch shown in FIG. 5.
    - Figure 7 is a front view showing the upper punch and the fingers in their working position.
    - Figure 8 is a detailed view of a knife.
    - Figure 9 is an exploded view of the knife of Figure 8.
    - Figure 10 is a view of a corrugated metal sheet for the construction of a waterproof membrane of a liquefied natural gas storage tank.
    Detailed description of embodiments
    FIG. 10 illustrates a corrugated metal sheet 1, intended for the formation of a waterproof membrane of a tank for storing a cryogenic fluid, such as liquefied natural gas.
    The metal sheet 1 of rectangular shape comprises a first series of parallel corrugations 2, called low, extending in a direction y from one edge to the other of the sheet and a second series of parallel corrugations 3, said high , extending in a direction x from one edge to the other of the metal sheet 1. The directions x and y of the series of corrugations are perpendicular. The corrugations 2, 3 are, for example, protruding from the side of the internal face of the metal sheet 1, intended to be brought into contact with the fluid contained in the tank. The edges of its metal sheet 1 are here parallel to the corrugations 2, 3. Note that the terms “high” and “low” have a relative meaning and mean that the corrugations 2, said low, have a height less than the corrugations 3, said high. In a variant not shown, the corrugations 2, 3 can have the same height.
    The metal sheet 1 has, between the corrugations 2, 3, a plurality of flat surfaces 4. At each crossing between a low corrugation 2 and a high corrugation 3, the metal sheet 1 has a knot area 5. The knot area 5 comprises a central portion 6 having an apex projecting inwards or outwards from the tank. Furthermore, the central portion 6 is bordered, on the one hand, by a pair of concave corrugations 7 formed in the crest of the upper corrugation 3 and, on the other hand, by a pair of recesses 8 into which the '' low ripple 2.
    The corrugations 2, 3 of the metal sheet 1 allow the waterproofing membrane to be flexible in order to be able to deform under the effect of the thermal and mechanical stresses generated by the liquefied natural gas stored in the tank.
    The metal sheet 1 can in particular be made of stainless steel, aluminum, Invar®: that is to say an alloy of iron and nickel whose coefficient of expansion is typically between 1.2 × 10 -6 and 2.10® K ' 1 , or in an iron alloy with a high manganese content, the coefficient of expansion of which is typically of the order of 7.1 θ' 6 K ' 1 . However, the use of other metals or alloys is also possible.
    By way of example, the metal sheet 1 has a thickness of approximately 1.2 mm. Other thicknesses are also possible, given that thickening of the metal sheet 1 increases its cost and generally increases the rigidity of the corrugations 2, 3. For example, the metal sheet has a width of 1 m and a length of 3 m.
    Figures 1 to 4 show a folding machine 9 for forming, in a metal sheet, a low corrugation 2, as well as the knot area 5 between this low corrugation 2 and a high corrugation 3 which has been previously formed.
    By convention, the “longitudinal” orientation of the folding machine 9 is directed parallel to the axis y, that is to say parallel to the direction of the corrugation 2 to be formed and the “transverse” orientation is directed parallel to the x axis, that is to say transversely to the direction of the ripple 2 to be formed.
    As shown in Figures 1 to 4, the folding machine 9 has an upper frame 10 and a lower frame 11. The upper frame 10 and the lower frame 11 are movable vertically relative to each other between a position of rest, illustrated in Figures 1 and 3, and a folding position, illustrated in Figures 2 and 4.
    The upper frame 10 is equipped with an upper punch 12 and is thus able to exert on the metal sheet a pressure allowing its folding and the formation of the corrugation. The upper punch 12 has, at its lower end, a head 13 which extends in the longitudinal direction. The head 13 has a convex portion whose section has a V shape corresponding to the shape of the corrugation to be shaped.
    Advantageously, the V-shaped section of the head 13 has a substantially semi-elliptical shape delimited by two arcuate side faces. Thus, the folding machine 9 makes it possible to give the corrugation to form a substantially semi-elliptical final shape. Therefore, the metal sheet 1 thus produced does not need to be shaped in a second step in order to give the corrugation its final shape.
    The upper punch 12 further comprises a lug 14 projecting from the median zone of the head 13 in the direction of the lower frame 11. The lug 14 has a shape of strip which is capable of deforming the zone of intersection between the corrugation preformed and the ripple to be formed in order to shape, in the knot area, a projecting vertex.
    Furthermore, the folding machine 9 comprises a matrix which consists of first and second matrix elements 15, 16. The first matrix element 15 is only partially shown in FIGS. 1 to 4 in order to facilitate the observation of the other components of the folding machine 9. The first and second matrix elements 15, 16 are identical and symmetrical to each other with respect to a vertical median plane extending in the longitudinal direction . The matrix elements 15, 16 are slidably mounted horizontally on the lower frame 11 in a transverse direction, between a separated position and a close position. The matrix elements 15, 16 have a bearing surface 17 against which is intended to bear the metal sheet. Each matrix element 15, 16 further comprises, at its edge facing the other matrix element, a half-cavity 18, concave. When the two matrix elements 15, 16 are in a close position, the half-impressions 18 together form the impression corresponding to the shape of the corrugation to be formed. In addition, in their close position, the imprint is arranged below the head 13 of the upper punch 12.
    Return members, not shown, provide a return of the two matrix elements 15, 16 to their separated position. The return members are for example springs which are each in abutment, on the one hand, against one of the matrix elements and, on the other hand, against a fixed element relative to the lower frame 11. According to another mode not shown, the return members are springs whose ends are respectively in abutment against one and the other of the two matrix elements 15, 16.
    Furthermore, the lower frame 11 is equipped with abutment elements 19 making it possible to limit the return stroke of the matrix elements 15, 16 so as to define the spaced-apart position of the matrix elements 15, 16 relative to the lower frame 11. The stop elements 19 are fixed against an edge of the lower frame 11 and have a portion 20 which projects towards the matrix elements 15, 16 and the end of which forms a stop surface.
    Each matrix element 15, 16 is secured to carriages 21 mounted to slide horizontally, in the transverse direction, on guide rails 22 carried by the lower frame 11. The carriages 21 are advantageously rolling carriages which comprise a plurality of bodies rollers capable of cooperating with raceways carried by the guide rails 22.
    The matrix elements 15, 16 each comprise, in a central portion, a transversely oriented free space, such as a V-shaped groove 23, shown in FIG. 1, extending in the transverse direction and allowing the passage of the preformed ripple.
    Furthermore, the upper frame 10 carries two sidewall clamps 24 extending respectively on either side of the upper punch 12. In FIGS. 1 to 4, only one of the two sidewall clamps 24 is shown in order to facilitate the observation of the other components of the folding machine 9. The two side greenhouses 24 are identical and symmetrical to each other with respect to the median vertical plane extending in the longitudinal direction. Each flank clamp 24 is disposed above a respective matrix element 15, 16. The flank clamps 24 being carried by the upper frame 10, they are able to be moved vertically from a relaxed position to a clamping position in which they press the metal sheet against the bearing surface 17 of the matrix elements 15, 16, when the upper frame 10 is moved towards the lower frame 11.
    The sidewall clamps 24 are further mounted movable vertically relative to the upper frame 10. To do this, each sidewall clamp 24 is slidably mounted vertically on a support plate 25 via a guide device. The guide device comprises a plurality of guides 26 integral with each of the side-flanks and slidably mounted in bores made in the support plate 25. Furthermore, gas cylinders 27, also called gas springs, have a first end fixed to the support plate 25 and a second end fixed to one of the side clamps 24. The gas cylinders 27 exert on its side clamps 24 an effort tending to move them downward relative to the support plate 25. Thus, by virtue of such an arrangement, the movements of the side clamps 24, towards their clamping position, and of the upper punch 12, towards its folding position, can be ensured simultaneously by moving the upper frame 10 downwards. towards the lower frame 11. Alternatively, the gas cylinders 27 can be replaced by any other equivalent return means, such as coil springs or hydraulic cylinders stiff or pneumatic for example.
    The sidewall clamps 24 are slidably mounted horizontally in a transverse direction, perpendicular to the longitudinal direction of the corrugation to be formed, between a separated position and a close position. To do this, each support plate 25 is secured to carriages 28 which are slidably mounted on guide rails 29 carried by the upper frame 10. Furthermore, one or more return members 30, in particular shown in FIG. 3, ensure a return of the flanks 24 to their separated position. By way of example, the return members 30 are springs which have a first end in abutment against a side face of the punch 12 and a second end in abutment against the support plate 25 opposite.
    Furthermore, the upper frame 10 is equipped with stop elements 31 making it possible to limit the travel of the side clamps 24 so as to define the spaced position of said side clamps 24 relative to the upper frame 10. Each stop member 31 comprises a wing 32 fixed to the upper frame 10 which is provided with a threaded bore, and a threaded screw 33, cooperating with the threaded bore, and the end of which projects in the direction of one of the flank clamps 24 constitutes ia abutment surface.
    Each sidewall clamp 24 comprises a male element 34, in particular shown in FIGS. 1 and 3, projecting and directed downwards, above the groove 23 formed in the matrix element 15, 16 opposite. screw. Consequently, in operation, when the flank clamps 24 are positioned in their clamping position, the high preformed corrugation is maintained between its male elements 34 of the flank clamps 24 and the grooves 23 of the matrix elements 15, 16. Thus , a tightening of the metal plate is also carried out at the level of the preformed corrugation.
    In operation, when the upper frame 10 is moved in the direction of the lower frame 11, from its rest position to its folding position, the side clamps 24 as well as the matrix elements 15, 16 tighten the metal sheet so that that -this, by deforming, transmits a tensile force to the matrix elements 15, 16 and to the flanks 24 and thus displaces them towards their close position. The movement of the matrix elements 15, 16 and the sidewall clamps 24 in the direction of their close position can also be assisted by an assistance device which will be described in detail below.
    Furthermore, in order to ensure the flatness of the metal sheet obtained by means of such a folding machine 9, the latter comprises two fingers 35, 36 which are respectively arranged on either side of the upper punch 12. The fingers 35, 36 are positioned, in the longitudinal direction, in a central region of the folding machine 9. The fingers 35, 36 are each pivotally mounted on the upper frame 10 around an axis of rotation 37, 38 extending in the longitudinal direction, that is to say parallel to the axis of the undulation to be formed. To do this, each of the fingers 35, 36 is pivotally mounted on a support element 39 which is fixed against one of the lateral faces of the upper punch 12.
    Each of the fingers 35, 36 has a rectangular parallelepiped shape. The fingers 35, 36 each have a lower end which is directed towards the lower frame 11 and which is intended to come into contact with the metal sheet during the folding operation. The lower end is here formed by a lower face 40 of rectangular shape, the largest dimension of which extends in the longitudinal direction of the corrugation to be formed.
    The fingers 35, 36 are movable in rotation about their respective axis of rotation 37, 38 between a rest position, illustrated in particular in Figures 3 and 5, and a working position, illustrated in particular in Figures 4 and 7. As shown in Figures 3 and 5, when the fingers 35, 36 are in their rest position, they are inclined relative to a vertical plane so that the underside 40 of the fingers 35, 36 is inclined relative to a plane horizontal. More particularly, in this rest position, the lateral edge 40b of the lower face 40 which is closer to the upper punch 12 is lower than the opposite lateral edge 40a. As shown in Figures 4 and 7, when the fingers 35, 36 are in their working position, they are pressed against its lateral face of the upper punch 12 and therefore extend substantially vertically. The underside 40 of the fingers 35, 36 is then substantially horizontal.
    Furthermore, the folding machine 9 includes return members making it possible to return the fingers 35, 36 to their rest position. As shown in FIG. 5, the return members are for example helical springs 41 which are each in abutment, on the one hand, against one of the lateral faces of the upper punch 12, and, on the other hand, against the one of the lateral faces of one of the fingers 35, 36. In order to allow the helical springs 41 to be retained, these are each housed in a recess, not shown, formed in the lateral face of the upper punch 12.
    Furthermore, the support element 39 comprises abutment elements 42 which make it possible to limit the movement of the fingers 35, 36 under the effect of their respective return members and which thus define the rest position of said fingers 35, 36. Advantageously, its stop elements 42 are adjustable and thus make it possible to adjust the inclination of the fingers 35, 36 when they are in their rest position. To do this, in the embodiment shown, each support element 39 comprises a wing which is arranged opposite one of the lateral faces of one of the fingers 35, 36 and which has a threaded bore . A threaded screw 43 is further inserted through said threaded bore. The threaded screw 43 has one end which projects towards the lateral face of the finger 35, 36 and which thus constitutes the abutment surface. Thus, the rotation of the threaded screw 43 in one or the other direction of rotation allows, as desired, to increase or decrease the inclination of the fingers 35, 36 relative to a vertical plane, when said fingers 35 , 36 are in their rest position. The inclination of the fingers 35, 36, in their rest position has an effect on the correction of the pananeity of the metal sheets. The inclination of the fingers 35, 36 leading to a pananeity of the folded metal sheet 1 can in particular be determined by tests.
    In operation, during the movement of the upper frame 10 from its rest position to its folding position, the metal sheet is initially clamped between a contact zone of its lower face 40 of each of the fingers 35, 36 and the surfaces bearing 17 of the matrix elements 15. Given the inclination of the fingers 35, 36 in their rest position, the contact zone is located at the lateral edge 40b of the lower face 40 which is adjacent to the punch upper 12. In a second step, the matrix elements 15, 16 moving in the direction of their close position under the effect of the movement of the upper punch 12 in the direction of its folding position, the fingers 35, 36 move towards their working position, illustrated in FIGS. 4 and 7. During this movement towards the working position of the fingers 35, 36, its zones of contact with the fingers 35, 36 previously identified, that is to say the edges lateral x 40b, move upward relative to the upper frame 10, approaching one another. When the fingers 35, 36 move from their rest position to their folding position, the helical springs 41 compress and the first and second fingers 35, 36 thus exert a reaction force on the metal sheet 1 having the effect of constraining the metal sheet, on either side of the corrugation formed, towards the matrix elements 15, 16. These constraints, exerted by the fingers 35, 36, make it possible to oppose the elastic return of the metal sheet during the return of the upper frame 10 towards its rest position and thus make it possible to significantly improve the flatness of the metal sheet thus folded.
    During the return movement of the upper frame 10, from its folding position to its rest position, the fingers 35, 36 are forced towards their rest position under the effect of their return members.
    Furthermore, the folding machine 9 comprises assistance means arranged to assist the movement of the matrix elements 15, 16 towards their close position. The assistance means make it possible to guarantee that the matrix elements 15, 16 and consequently the side-flanks 24 move over their entire travel, that is to say to their close end position during movement of the upper punch 12 towards the folding position.
    The assistance means, represented in FIGS. 1 to 4, comprise for each of the matrix elements 15, 16 at least one arm 44, 46 pivotally mounted on the lower frame 11 (the arm 46 intended to assist the movement of the matrix element 16 is visible only in FIGS. 3 and 4 and is partly masked by other components of the folding machine 9). The arms 44, 46 are movable in rotation about a horizontal axis of rotation and oriented in the longitudinal direction. In the embodiment shown, the assistance means comprise, for each of the matrix elements, two arms 44, 46.
    The two arms 44, 46 which assist the movement of the same matrix element 15, 16 are advantageously identical and their axes of rotation are aligned. The two arms 44, 46 intended to assist the movement of the same matrix element 15, 16 are arranged on either side of a median transverse plane of the lower frame, which enables its assistance forces exerted to be distributed equitably. on His matrix elements 15, 16.
    The arms 44, 46 are mounted in rotation on a T-shaped support 47. Each support 47 is positioned near an edge of the lower frame 11 and is centered relative to a vertical median plane oriented in the longitudinal direction. The axes of rotation of the two arms 44, 46 are positioned at the two ends of the upper branch of the T.
    Each of the arms 44, 46 has a first end, not shown, which is arranged to be moved in the direction of the lower frame 11 when the upper punch 12 is moved from its rest position (FIGS. 1 and 3) to its folding position ( Figures 2 and 3) so as to rotate said arm 44, 46. To do this, the assistance means comprise two contact parts 48, 49 movable vertically on the lower frame 11. Each of the contact parts 48, 49 has a bearing surface positioned inside the cavity of the matrix, that is to say between the two matrix elements 15, 16. As shown in FIGS. 1 and 13, the bearing surfaces of the two contact parts 48, 49 are flush with the support surface 17 of the matrix elements 15, 16 when the upper frame 10 is in its rest position.
    Thus, during the movement of the upper punch 12 from its rest position towards its folding position, its head 13 of the upper punch 12 comes, firstly, to clamp the metal sheet against said bearing surfaces 17 when the upper punch 12 arrives in an intermediate position of contact with the metal sheet. In a second step, the movement of the upper punch 12 from its aforementioned intermediate contact position towards its folding position, illustrated in FIGS. 2 and 4, causes the contact pieces 48, 49 to move downward, towards the frame. lower 11. Thus, in operation, when the upper punch 12 comes into contact with the portion of the metal sheet to be bent, the upper punch 12 exerts on the contact pieces 48, 49 a force tending to move them towards the lower frame 11 , as shown in Figures 2 and 4.
    Each of the contact pieces 48, 49 is supported via a cam surface, not shown, with the first end of two arms 44, 46 so that said arms 44, 46 pivot when the contact pieces 48, 49 are moved towards the bottom towards the lower frame 11. The first end of each of the arms 44, 46 is equipped with a roller, not shown, which is mounted idly around a horizontal axis oriented in the longitudinal direction and which cooperates with the cam surface of the contact part 48, 49, which makes it possible to reduce parasitic friction. Advantageously, the rollers are fitted with bearings which further reduces parasitic friction.
    Furthermore, as illustrated in FIGS. 1 and 2, the second end of the arms 44, 46 comprises a cam follower which is here formed by a roller 50 mounted idly along an axis which is horizontal and oriented in the longitudinal direction. Each roller 50 is offset relative to the plane in which the arms 44, 46 pivot so as to be able to be housed in a groove 51 formed in one of the matrix elements 15, 16 (In FIGS. 1 and 2, a single groove 51 is visible in the partial representation of the matrix element 15). The groove 51 is defined by two surfaces extending vertically on either side of the roller 50 in the transverse direction. The surface which delimits the groove 51 in the direction of the median longitudinal plane of the folding machine constitutes a cam surface 66 capable of cooperating with the roller 50.
    The two arms 44, 46, actuated by the same contact piece 48, 49, extend in two separate transverse planes. It is further observed that the two arms 44, 46 pivot in opposite directions of rotation when the upper punch 12 moves towards the lower frame 11. In the embodiment shown, Its arms 44, 46 are bent.
    The configuration of each of the arms 44, 46 can be defined using the following two geometric axes: a first vertical axis passing through the axis of rotation of said arm 44, 46 and a second axis intersecting, on the one hand, said axis of rotation and, on the other hand, axis of rotation of the roller 50. The arms 44, 46 are configured so that the angle formed between the first and the second axis defined by each of the arms 44, 46 decreases when said arm 44, 46 pivots due to the displacement of the upper punch 12 from its rest position towards its folding position. In other words, the arms 44, 46 are configured such that the portion of the arms 44, 46 extending between their second end and their axis of rotation approaches its vertical when the upper punch 12 moves towards its folding position. Thus, during folding, each roller 50 exerts on its respective cam surface a horizontal force directed towards the median longitudinal plane of the folding machine 9 so as to assist the movement of the die element 15, 16 in question towards its close position. Conversely, when the folding operation is completed and the upper frame 10 returns to its rest position, the matrix elements 15, 16 are returned to their separated position by their respective return member and the cam surface 66 guide ie roller 50 horizontally in a direction opposite to the median longitudinal plane of the folding machine 9 so as to rotate the arms 44, 46 in a reverse direction of rotation until they return to their initial position, shown in Figures 1 and 3.
    Furthermore, the folding machine 9 also comprises two knives, 52, 53 in particular shown in FIGS. 1 to 4 (the knife 53 is only shown in FIG. 1 and is partially masked by other components of the machine. folding 9) carried by the lower frame 11 and a knife actuation device. The knives 52, 53 are respectively arranged on either side of the median longitudinal plane. The knives 52, 53 each have a blade directed upwards and extending parallel to the longitudinal direction. The knives 52, 53 are intended for the deformation of the preformed corrugation on either side of the cross between the preformed corrugation and the corrugation to be formed so as to form concave corrugations in the crest of the preformed corrugation.
    The knives 52, 53 are also slidably mounted, relative to the lower frame 11, in a transverse direction between a separated position and a close position. To do this, the knives 52, 53 are each fixed to a carriage 54 mounted to slide on a guide rail 55.
    The guide rails 55 are carried by a support member 56, partially shown in Figures 1 and 2. Return members, not shown, provide automatic return of the knives 52, 53 to their separated position. To do this, the return members act between the central portion of the support member 56 and the knives.
    The support member 56 is mounted movable vertically with respect to the lower frame 11 between a low position and a high position for folding the preformed corrugation in which the knives 52, 53 are able to cooperate with the preformed corrugation in order to shape. The support member 56 is guided in translation relative to the lower frame 11. Furthermore, the folding machine 9 includes a knife actuation device, partially shown in FIGS. 1 and 2, which is able to move the support member 56 upwards so that the knives 52, 53 are moved from their low position to their high folding position, during folding. The knife actuation device comprises two levers 57, only one of which is visible in FIGS. 1 and 2. The levers 57 are each mounted articulated on the lower frame 11 around a transverse horizontal axis of rotation.
    The levers 57 each have a first end fitted with a roller 58 which is movably mounted in a housing formed in one or the other of the contact parts 48, 49. Consequently, its levers 57 pivot when, due to the movement of the upper punch 12 from its rest position to its folding position, the contact parts 48, 49 are moved down towards the lower frame 11. As shown for example in Figures 1 and 2, we observe that the first end of the levers 57 comprises a pin 59 coaxial with the axis of rotation of the roller 58 and projecting on either side of the roller 58. The pin 59 is housed in a through hole formed in the contact parts 48 , 49, on either side of the housing, which ensures the retention of the roller 58 in the housing.
    Furthermore, the levers 57 each have a second end 60, shown in FIGS. 1 and 2, cooperating with the support member 56 in order to move it vertically when the levers pivot. To do this, the second end 60 of each lever 57 cooperates with a horizontal flange carried by the central portion of the support member 56. The levers 57 are symmetrical, with respect to a transverse median plane. The levers 57 therefore pivot in opposite directions of rotation, which ensures a balancing of the forces.
    In operation, when the upper punch 12 comes into contact with the portion of the metal sheet to be bent, the upper punch 12 exerts via the contact pieces 48, 49 a force on the first end of each of the levers 57. These forces tend to rotate the levers 57 so that the second ends 60 of the levers 57 act on the horizontal edges of the support member 56 and the knives 52, 53 move to their high folding position in which they deform the crest of the preformed ripple. When the folding operation is completed and the upper punch 12 is raised to its rest position, the support member 56 returns to its lower rest position under the effect of gravity by causing the levers 57 to pivot according to opposite direction of rotation, until they return to their initial rest position. Consequently, the contact parts 48, 49 also return to their initial position in which the support surfaces of the two contact parts 48, 49 are flush with the support surface 17 of the matrix elements 15, 16.
    The specific structure of the knives 52, 53 is shown in detail in FIGS. 7 and 8. Such a structure differs from the structure of the knives of the prior art, as described and represented in FIG. 9 of application WO2015170054 , so as to further improve the flatness of the metal sheet. Indeed, while the blade of the knives of the prior art has a constant section in the longitudinal direction and that consequently the end of their blade follows a straight line, the structure of the knives 52, 53 is here different .
    The blade 61 of the knives 52, 53 has a central portion 64 and two lateral portions 62, 63 arranged on either side of the central portion 64 in the longitudinal direction. The central portion 64 projects upwards, that is to say in the direction of the upper frame 16, beyond the two lateral portions 62, 63. Thus, such a structure makes it possible to provide concave undulations in the crest of the high ripple whose fold line has a slight concavity in a direction opposite to that of the formed ripple. This makes it possible to oppose the elastic return of the metal sheet and thus contributes to improving the flatness of the metal sheet thus bent.
    In the embodiment shown, the central portion 64 of the blade 61 is not formed integrally with the lateral portions 62, 63. In order to secure the central portion 64 of its blade with the body of the knife 52, 53, the latter comprises an orifice through which a screw 65 is adapted to be housed in a threaded bore of complementary shape formed in its central portion 64.
    In an embodiment not shown, the blade of the knives 52, 53 has a convex shape projecting towards the upper frame 10. In such a case, the edge of the blade may in particular have the shape of an arc of a circle or of d 'a portion of ellipse.
    The method of using the folding machine 9 is described below.
    Firstly, the metal sheet 1 is placed on the bearing surfaces 17 of the matrix elements 15, 16. The metal sheet 1 is positioned so that its high preformed corrugation is positioned inside the grooves 23 in V shape of the matrix elements 15, 16.
    Thereafter, the upper frame 10 is moved downward, towards the lower frame 11 until the side clamps 24 are positioned in their clamping position in which they clamp the metal sheet against the surfaces of support 17 of the matrix elements 15, 16. Then, the gas cylinders 27 compress while the upper frame 10 continues to descend and the upper punch 12 deforms the metal sheet 1.
    The metal sheet 1 being clamped between the sidewall clamps 24 and the matrix elements 15, 16, the metal sheet 1, by deforming under the effect of the upper punch 12, exerts a pulling force on the sidewall clamps 24 and the matrix elements 15, 16, against their respective return members, in order to move them to their close position.
    Simultaneously, the metal sheet 1 is also clamped between the upper punch and the bearing surfaces of the contact pieces 48, 49 and its contact pieces 48, 49 move towards the lower frame 11. This movement of the contact pieces 48, 49 simultaneously causes the arms 44, 46 and the levers 57 to pivot.
    As explained above, the pivoting of the arms 44, 46 has the effect of displacing the cam followers so that they exert on the respective cam surfaces 51 carried by its matrix elements 15, 16 an effort leading to assist their movement towards their close position. Advantageously, such assistance means are configured so that the forces exerted on the matrix elements 15, 16 are partly exerted by the metal sheet, under the effect of its deformation, the assistance means n preferably intervening at the end of the stroke in order to ensure that the matrix elements 15, 16 reach their close end position.
    In addition, the pivoting of the levers 57 causes the blades 52, 53 to move towards their high position and consequently the deformation of the preformed betting corrugation and of the crossover between the preformed corrugation and the corrugation to be formed.
    In parallel, its matrix elements 15, 16 moving in the direction of their close position, the fingers 35, 36 are driven towards their working position so that said fingers 35, 36 exert stress reactions on the metal sheet 1 having the effect of opposing its elastic return.
    When the upper punch 12 has reached its extreme position, the upper frame 10 can then be brought back upwards, moving away from the lower frame 11 in the direction of its rest position. The fingers 35, 36 are then returned to their rest position. Furthermore, the sidewalls 24 and the matrix elements 15, 16 are automatically returned to their separated position under the effect of their respective return members. The support member 56 returns to its rest position under the effect of gravity by driving the levers 57 as well as the contact parts 48, 49 to their initial high position. Furthermore, when the matrix elements 15, 16 are returned to their separated position, the cam surface exerts on Se roller a force tending to rotate the arms 44, 46 in a reverse direction of rotation until said arms 44, 46 return to their original position.
    We observe that if the folding machine 9 described above makes it possible to form a corrugation in a metal sheet having a single preformed corrugation, the invention is in no way limited to such an embodiment. In particular, it is possible to form a corrugation in a metal sheet having a plurality of parallel preformed corrugations by aligning a plurality of folding machines 9 as described above, one after the other in their longitudinal direction.
    Although the invention has been described in connection with several particular embodiments, it is obvious that it is in no way limited thereto and that it includes all the technical equivalents of the means described as well as their combinations if these fall within the scope of the invention.
    In particular, it should be noted that such a folding machine can also be used for its formation of high corrugations of a metal sheet. In such a case, the folding machine is simplified and does not include a knife, a groove in the matrix elements and a male element carried in the side clamps.
    The use of the verb "behave", "understand" or "include" and its conjugate forms do not exclude the presence of other elements or steps than those set out in a claim.
    In the claims, any reference sign in parentheses should not be interpreted as a limitation of the claim.
    权利要求:
    Claims (14)
    [1" id="c-fr-0001]
    1. Folding machine (9) for forming a corrugation (2) in a metal sheet (1) intended for the construction of a waterproof membrane of a fluid storage tank, the folding machine (9) comprising:
    - a lower frame (11);
    - a lower matrix comprising a first and a second matrix element (15, 16) each having a bearing surface (17) of the metal sheet (1) and a concave half-cavity, the first and second matrix elements ( 15, 16) being each mounted movable on the lower frame (11), transversely to a longitudinal direction of the corrugation (2) to form, between a separated position and a close position, the half-impressions (18) of the first and second matrix elements (15, 16) together defining the imprint corresponding to the shape of the corrugation to be formed when the first and second matrix elements (15, 16) are in their close position;
    - an upper frame (10) comprising an upper punch (12), arranged above the lower die, and comprising a lower end provided with a head having a shape complementary to that of the imprint, the upper frame (10) being movable vertically relative to the lower frame (11) between a rest position and a folding position in which the head of said upper punch (12) is engaged inside the cavity of the lower die so as to press the sheet metallic (1);
    - the folding machine (9) being configured so that the matrix elements (15, 16) move from their spaced direction to their close position when the upper frame (10) is moved from its rest position to its position folding;
    - the folding machine (9) further comprising a first and a second finger (35, 36) respectively arranged on either side of the upper punch (12), each of the first and second fingers (35, 36) comprising a lower end directed towards the lower frame (11) and being pivotally mounted on the upper frame (10), along an axis of rotation (37) parallel to the longitudinal axis of the corrugation to be formed, between a rest position and a working position; the lower end (40) of the first and second fingers (35, 36) having a contact zone intended to cooperate with the metal sheet (1), said contact zones (40b) moving so
    5 ascending relative to the upper frame (10), approaching one another when the first and second fingers (35, 36) pivot from their rest position to their working position; said first and second fingers (35, 36) each being returned to their rest position by a return member (41);
    10 - said first and second fingers (35, 36) being arranged such that:
    - during the movement of the upper frame (10) from its rest position towards its folding position, the first and second fingers (35, 36) tighten the metal sheet (1) against the bearing surface (17) of the first and of the second matrix elements (15, 16) and move from their rest position towards
    15 their working position under the effect of the displacement of the first and second die elements (15, 16) to their close position, the displacement of the first and second fingers (35, 36) from their rest position to their working position constraining the return member (41) so that the first and second fingers (35, 36) exert a reaction on the sheet
    20 metallic (1) a force having the effect of forcing the metal sheet (1) towards the first and second matrix elements (15, 16); and
    - Come out of the movement of the upper frame (10) from its folding position to its rest position, said first and second fingers (35, 36) move from their working position to their rest position under the effect of the organ
    25 reminder
    [2" id="c-fr-0002]
    2. Folding machine (9) according to claim 1, further comprising stop elements (42) capable of limiting the movement of the first and second fingers (35, 36) under the effect of the return member ( 41) and thus defining the rest position of said first and second fingers (35, 36), the elements of
    30 stop (42) being adjustable so as to allow an adjustment of the rest position of said first and second fingers (35, 36).
    [3" id="c-fr-0003]
    3. Folding machine (9) according to claim 2, wherein each stop member (42) has a threaded bore and a threaded screw (43) which is inserted through said threaded bore; said threaded screw (43) having one end projecting towards one of the first and second fingers (35, 36) and constituting a stop surface.
    [4" id="c-fr-0004]
    4. Folding machine (9) according to any one of claims 1 to 3, in which the first and second fingers (35, 36) are pivotally mounted on a first and a second support element (39); the first and second support elements (39) being respectively fixed on a first and a second lateral face of the upper punch (12).
    [5" id="c-fr-0005]
    5. Folding machine (9) according to claim 4, wherein each return member is a helical spring (41) which is supported on the one hand against one of the side faces of the upper punch (12) and on the other hand against one of the first and second fingers (35, 36).
    [6" id="c-fr-0006]
    6. Folding machine (9) according to any one of claims 1 to 5, wherein the lower end of the first and second fingers (35, 36) has a planar lower face (40); ia contact zone being formed by a first edge (40b) of the lower face (40) which is oriented in the longitudinal direction of the wave to be formed and which is adjacent to the upper punch (12); said first and second fingers (35, 36) being arranged so that the inclination of their lower face (40) relative to a horizontal plane decreases during the movement of the first and second fingers (35, 36) from their position of rest towards their working position.
    [7" id="c-fr-0007]
    7. Folding machine (9) according to any one of claims 1 to 6, in which the first and second die elements (15, 16) are each slidably mounted in a direction transverse to the longitudinal direction of the corrugation. to be formed on the lower frame (11) between their separated position and their close position.
    [8" id="c-fr-0008]
    8. Folding machine (9) according to any one of claims 1 to 7, further comprising a first and a second clamp (24) extending on either side of the upper punch (12), at - above the lower die, respectively opposite the first and second die elements (15, 16), said first and second sidewall (24) being slidably mounted, in a direction transverse to the longitudinal direction of the undulation to be formed, between a close position and a separated position; the first and second sidewall (24) being movable vertically relative to the lower frame (11) between a relaxed position and a clamping position in which the first and second sidewall (24) are brought closer to the surface respectively support (17) of the first die element and the second die element so as to clamp the metal sheet (1) against the bearing surface (17) of the first and second die elements (15, 16).
    [9" id="c-fr-0009]
    9. Folding machine (9) according to any one of claims 1 to 8, intended to form the corrugation perpendicular to a preformed corrugation in the metal sheet (1) and further comprising:
    - two knives (52, 53) intended for the deformation of the preformed corrugation on either side of a crossover zone between the preformed corrugation and the corrugation to be formed, the two knives (52, 53) being movably mounted on the lower frame (11) between a low position and a high position for folding the preformed corrugation.
    [10" id="c-fr-0010]
    10. Folding machine (9) according to claim 9, wherein each of the two knives (52, 53) has a blade (61) which is directed towards the upper frame (10) and which extends parallel to the longitudinal direction of the corrugation to be formed, the blade (61) of said knives (52, 53) having a central portion (64) and two lateral portions (62, 63) arranged on either side of the central portion (64) according to said longitudinal direction; the central portion (64) projecting towards the upper frame (10), beyond the two lateral portions (62, 63).
    [11" id="c-fr-0011]
    11. Folding machine (9) according to claim 9 or 10, comprising two contact parts (48, 49) which are each mounted vertically movable on the lower frame (11) and which have a bearing surface positioned between its half -prints of the first and second die elements (15, 16) so that the metal sheet (1) is pinched between the bearing surface of each contact piece (48, 49) and the upper punch (12) and that said contact pieces (48, 49) are moved in the direction of the lower frame (11) during the movement of the upper frame (10) from its rest position to its folding position; the folding machine (9) further comprising a knife actuation device comprising a movement transmission mechanism which is arranged to transmit movement between the contact parts (48, 49) and the cutting knives (52, 53) so that the knives (52, 53) are moved to their upper folding position when the upper frame (12) is moved from its rest position to its folding position.
    [12" id="c-fr-0012]
    12. Folding machine (9) according to claim 11, in which the knives (52, 53) are each mounted in a transverse direction to the longitudinal direction of the corrugation to be formed, on a support member (56) between a spread position and a close position; the support member (56)
    5 being mounted vertically movable on the lower frame (11); the knife actuation device comprising two levers which are each mounted articulated on the lower frame (11) and each comprise a first end cooperating with one or the other of the two contact parts (48, 49) so as to cause the levers to pivot (57) Exit the movement of the upper punch
    10 (12) from its rest position to its folding position and a second end; the second ends of the levers (57) cooperating with the support member (56) so as to move said support member (56) vertically and thus move the knives from their low position to their high folding position. Exit from the pivoting of the levers (57) driven by a movement of the upper punch (12)
    15 from its rest position to its folding position.
    [13" id="c-fr-0013]
    13. Folding machine (9) according to any one of claims 1 to 12, further comprising assistance means capable of assisting the movement of the first and second die elements (15, 16) towards the close position; said means of assistance comprising:
    20 - a first and a second arm (44, 46) which are each pivotally mounted on the lower frame (11) around a respective axis of rotation and each has a first end arranged to be moved during the movement of the upper punch ( 12) from its rest position to its folding position so that the first and second arms (44, 46) pivot during the movement of the punch
    25 upper (12) from its rest position to its folding position and a second end equipped with a cam follower;
    Its cam followers of the first and second arms being able to cooperate with a cam surface (66) respectively carried by Se first and Se second matrix elements (15, 16); cam followers and cam surfaces (66)
    30 being arranged so that, during a pivoting of the first and second arms (44, 46) driven by the displacement of the upper punch (12) from its rest position to its folding position, each cam follower exerts on the respective cam surface (66), carried by the first or the second die element (15, 16), a force tending to move said die element (15, 16) in a direction transverse to the longitudinal direction of the ripple to form towards its close position.
    [14" id="c-fr-0014]
    14. Method for using a folding machine (9) according to any one of claims 1 to 13, comprising:
    5 - the positioning of a metal sheet (1) resting against the bearing surfaces (17) of the first and second matrix elements (15, 16); and
    - The displacement of the upper frame (10) from its rest position towards its folding position so as to form a corrugation (2) in the metal sheet (1).
    1/7
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    同族专利:
    公开号 | 公开日
    FR3057185B1|2018-11-16|
    CN107913928B|2021-06-15|
    CN107913928A|2018-04-17|
    KR102295951B1|2021-08-31|
    KR20180038398A|2018-04-16|
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    KR101583607B1|2014-08-25|2016-01-08|대구기계부품연구원|Apparatus for forming thin plate and manufacturing method using the same|
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    法律状态:
    2017-10-31| PLFP| Fee payment|Year of fee payment: 2 |
    2018-04-13| PLSC| Publication of the preliminary search report|Effective date: 20180413 |
    2018-10-30| PLFP| Fee payment|Year of fee payment: 3 |
    2019-10-31| PLFP| Fee payment|Year of fee payment: 4 |
    2020-10-30| PLFP| Fee payment|Year of fee payment: 5 |
    2021-10-29| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1659655|2016-10-06|
    FR1659655A|FR3057185B1|2016-10-06|2016-10-06|FOLDING MACHINE FOR FORMING A CORRUGATION IN A METAL SHEET|FR1659655A| FR3057185B1|2016-10-06|2016-10-06|FOLDING MACHINE FOR FORMING A CORRUGATION IN A METAL SHEET|
    CN201710929696.XA| CN107913928B|2016-10-06|2017-10-09|Bending machine for forming corrugations in a metal sheet|
    KR1020170129081A| KR102295951B1|2016-10-06|2017-10-10|Bending machine for forming a corrugation in a metal sheet|
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