• 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
  • 优先权
    • 专利摘要:
    The invention relates to a folding device for forming a corrugation (2) in a metal sheet, the folding device comprising: - a frame (9); a matrix comprising two matrix elements (14, 15) each having a concave half-cavity, slidably mounted on the frame (9); - A punch (11) having a head (12) adapted to engage inside the cavity (13) of the matrix so as to press the metal sheet; and - two flanks (16, 17) slidably mounted and movable vertically relative to the lower frame (9) so as to clamp the metal sheet (1) against the bearing surfaces of the matrix elements (14, 15). When the punch (11) is moved to its folding position, the metal sheet (1) transmits a pulling force to the die elements (14, 15) and to the wing clamps (16, 17) so as to move them towards their close position.
    公开号:FR3020769A1
    申请号:FR1454078
    申请日:2014-05-06
    公开日:2015-11-13
    发明作者:Olivier Perrot；Charles Gimbert；Thomas Conejero；Mohamed Sassi
    申请人:Gaztransport et Technigaz SARL；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD The invention relates to a folding device for forming a corrugation in a metal sheet for the construction of a sealed membrane of a fluid storage tank.
    [0002] The invention relates in particular to the field of tanks, waterproof and thermally insulating, with membranes, for the storage and / or transport of fluid, such as a cryogenic fluid. BACKGROUND ART In the state of the art, corrugated waterproofing membranes intended to form an internal coating for liquefied natural gas storage tanks are known. The sealing membrane consists of a plurality of metal plates having a series of perpendicular corrugations allowing it to deform under the effect of thermal and mechanical stresses generated by the fluid stored in the tank.
    [0003] Such a corrugated waterproofing membrane is described in particular in document FR2861030. The corrugated membrane comprises a first series of parallel corrugations, said high, extending in a direction y and a second series of parallel corrugations, said low, extending in a direction x perpendicular to the direction y.
    [0004] The document KR1020080090107 describes a folding device for forming a corrugation in such a waterproofing membrane. The folding device, shown in FIGS. 6a to 6c of the aforementioned document, comprises a matrix having two matrix elements each having a half-cavity, movable between a spaced position and a close position. When the two matrix elements are brought close to each other, the half-impressions together form an imprint corresponding to the shape of the corrugation to be formed. Furthermore, the device comprises a movable punch between a rest position and a folding position in which the punch is engaged inside the cavity to shape the corrugation. The folding device also comprises two clamps, extending on either side of the punch and cooperating respectively with one and the other of the matrix elements. The side clamps hold the sheet metal against the matrix elements to ensure that it remains in position when it is folded. The matrix elements and the flanks are moved by actuating means controlled by a control unit. In a folding operation, the two die members and the two edge clamps move toward each other simultaneously with the movement of the punch toward its folding position. The movements of the die elements and the flanks are precisely synchronized with the movement of the punch so that there is no change in the thickness of the metal sheet during its folding. It is indeed essential that the metal sheet has, after folding, a constant thickness so as not to degrade its mechanical properties. This necessity of synchronization of the movements implies, on the one hand, that the device is regulated precisely and that, on the other hand, the control of the movements is perfectly realized. In fact, any asynchronism causes, at the level of the corrugation, either a decrease in the thickness of the metal sheet, or an excess of material and consequently undesirable creases of the metal sheet. SUMMARY An idea underlying the invention is to propose a folding device for forming a corrugation in a metal sheet intended for the construction of a sealed membrane of a storage tank which is simple and makes it possible to obtain a corrugation. without changing the thickness of the sheet. According to one embodiment, the invention provides a folding device for forming a corrugation in a metal sheet for the construction of a sealed membrane of a fluid storage tank, the folding device comprising: a lower frame; a lower die having first and second die members each having a bearing surface of the metal sheet and a concave half-cavity, the first and second die members being each slidably mounted on the lower frame, in a direction x , so as to be slidable between a spaced apart position and a close position, the halfprints of the first and second die elements together defining an imprint corresponding to the shape of the corrugation to be formed when the first and second die members are in their close position, said first and second die members being biased towards their spaced apart position by a first biasing member; an upper punch, arranged above the lower die, having a lower end provided with a head having a shape complementary to that of the imprint, said upper punch being vertically movable relative to the lower frame between a rest position and a folding position in which the head of said upper punch is engaged inside the cavity of the lower die so as to press the metal sheet; and first and second sidewall clamps extending on either side of the upper punch, above the lower die, respectively facing the first and second die members, said first and second serre4lancs being mounted_couleur, in the direction x, between a close position and a position away and being returned to their position separated by a second return member; the first and second flanks being movable vertically with respect to the lower frame between a relaxed position and a clamping position in which the first and second flanks are respectively brought closer to the bearing surface of the first die member and of the second die member so as to clamp the metal sheet against the bearing surface of the first and second die members such that, in use, when the metal sheet is clamped between the edge clamps and the die members the movement 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 traction force in the x direction to the die elements and to the flanks and thus moves the matrix elements and the flanks to their close position. Thus, the folding device is relatively simple since it does not require specific actuation means for the movement of the matrix elements and the flanks. In addition, the metal sheets produced by such a folding device have a constant thickness at their corrugation because the displacement of the matrix elements and flanks is ensured by tensile forces exerted by the metal sheet, during its deformation by the punch, which involves a synchronization of the movements of the matrix elements and flanks with that of the punch. According to embodiments, such a folding device may comprise one or more of the following features: the folding device is intended to form a corrugation in a metal sheet having a preformed corrugation extending in a direction perpendicular to the corrugation to train; the first and second die members each having a V-shaped groove for receiving said preformed corrugation. - The flanks each comprise a male element, projecting towards the lower frame, having a V-shaped which is adapted to be introduced into the groove of the die element vis-à-vis when the greenhouse -flanks are in their tightening position. the head of the punch comprises a finger projecting from the head in the direction of the lower frame and disposed opposite the intersection zone between the cavity and the grooves of the first and second matrix elements. the folding device comprises two knives, intended for the deformation of the preformed corrugation, on either side of the intersection between the preformed corrugation and the undulation to be formed, the two knives being arranged on either side the intersection area between the imprint and the grooves of the first and second die members; said knives being slidably mounted on the lower frame in the x direction between a spaced position and a close position and being biased towards their spaced apart position by a third biasing member, said knives being further mounted movable vertically with respect to the lower frame between a low rest position and a high folding position in which they are able to deform the preformed corrugation, the device further comprising a knife actuating mechanism which is arranged to move the knives to their upper folding position when moving from the punch to its folding position. - The actuating mechanism of the knives comprises a movable knife support member mounted vertically movable on the lower frame and two levers which are each mounted articulated on the lower frame; the levers each comprising: a first end provided with a bearing surface, extending inside the cavity of the lower die and adapted to cooperate, in use, with a portion of the metal sheet intended to be folded to form the corrugation, so that the lever pivots as the punch moves to its folding position; and a second end cooperating with the movable support member for the knives so that the movable member for supporting the knives is moved upwards when, due to a movement of the upper punch towards its folding position, the lever pivots. - The knives are each carried by a carriage slidably mounted on a respective guide rail and said guide rails are carried by the movable support member knives. - The folding device comprises an upper pusher mounted vertically movable relative to the lower frame; the upper punch being carried by the upper pusher; the first and second side members being slidably mounted vertically respectively on first and second support plates; said first and second support plates being slidably mounted in the x direction on the upper pusher to allow movement of the flanks between their close position and their spaced apart position; each flange being further recalled remotely from its respective support plate by return members. - The return members exerting a return force between each clamp and its respective support plate are springs, gas cylinders, hydraulic cylinders or pneumatic cylinders. According to one embodiment, the invention also provides a folding installation comprising a plurality of folding devices mentioned above. According to one embodiment, the invention also provides a folding method for forming a corrugation in a metal sheet for the construction of a sealed membrane of a fluid storage tank by means of a folding device comprising: - a lower frame; a lower die having first and second die members each having a bearing surface of the metal sheet and a concave half-cavity, the first and second die members being each slidably mounted on the lower frame, in a direction x , so as to be slidable between a spaced apart position and a close position, the halfprints of the first and second die elements together defining an imprint corresponding to the shape of the corrugation to be formed when the first and second die members are in their close position, said first and second die members being biased towards their spaced apart position by a first biasing member; an upper punch, arranged above the lower die, having a lower end provided with a head having a shape complementary to that of the imprint, said upper punch being vertically movable relative to the lower frame between a rest position and a folding position in which the head of said upper punch is engaged inside the cavity of the lower die so as to press the metal sheet; and first and second sidewall clamps extending on either side of the upper punch, above the lower die, respectively facing the first and second die members, said first and second flank members being slidably mounted in the x-direction between a close position and a spaced apart position and being biased towards their spaced apart position by a second return member; the first and second flanks being movable vertically with respect to the lower frame between a relaxed position and a clamping position in which the first and second flanks are respectively brought closer to the bearing surface of the first die member and the second die member for clamping the metal sheet against the bearing surface of the first member and the second die member; said folding method comprising: positioning a metal sheet bearing against the bearing surfaces of the first and second die members; moving the first and second flanks into their clamping position in which the first and second flanks clamp the metal sheet respectively against the bearing surface of the first die member and the second die member; moving the upper punch to its folding position in which the head of the upper punch presses the metal sheet inside the cavity of the lower die to form a wave, said movement of the upper punch from its rest position to its folding position causing a folding of the metal sheet so that the metal sheet transmits a traction force in the x direction to the die elements and the flanks and thus displaces the die members and the flanks to their close position.
    [0005] According to embodiments, such a folding method may include one or more of the following features: the metal sheet to be folded comprises a preformed corrugation and the first and second die elements each comprise a V-shaped groove; during the positioning of the metal sheet bearing against the bearing surfaces of the first and second die elements, the preformed corrugation being engaged inside the grooves. the folding device comprises two knives, intended for the deformation of the preformed corrugation, on either side of the intersection between the preformed corrugation and the corrugation to be formed, the two knives being arranged on either side of the the intersection area between the imprint and the grooves of the first and second die members; said knives being slidably mounted on the lower frame in the x direction between a spaced position and a close position and being biased towards their spaced apart position by a third biasing member, said knives being further mounted movable vertically with respect to the lower frame between a low rest position and a high folding position in which they are able to deform the preformed corrugation, the device further comprising a knife actuating mechanism which is arranged to move the knives to their upper folding position when moving punch to its folding position; the movement of the upper punch towards its folding position causing, on the one hand, a movement of the knives towards their upper folding position, and, on the other hand, a folding of the metal sheet so that the metal sheet transmits a force traction in the x direction to the knives and thus moves the knives to their close position. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood, and other objects, details, features and advantages thereof will become more clearly apparent from the following description of several particular embodiments of the invention, given solely for the purposes of the invention. illustrative and not limiting, with reference to the accompanying drawings. - Figure 1 is a view of a corrugated metal plate for the construction of a sealed membrane of a liquefied natural gas storage tank. Figure 2 is a perspective view of a folding device for forming a corrugation in a metal sheet. FIG. 3 is a partial perspective view of a folding device in which the punch is shown in its rest position, the clamps being in the clamping position of the metal sheet against the matrix elements, the clamps flanks and the matrix elements being further in their spaced apart position. - Figure 4 is a partial perspective view of a folding device in which the punch is shown in its folding position, the flanks and die elements being in their close position. FIG. 5 is a view from above of the folding device of FIG. 3 in which the flanks and the matrix elements are in their separated position. FIG. 6 is a sectional view along the plane VI-VI of the folding device of FIG. 5. FIG. 7 is a front view of the folding device of FIG. 3 in which the clamps and the elements of FIG. matrix are in their discarded position. FIG. 8 is a sectional view along the plane VIII-VIII of the folding device of FIG. 7; FIG. 9 is a perspective view of a knife for deformation of a high corrugation on the part of FIG. another of a cross between a high undulation and a low undulation. FIG. 10 is a side view of a folding installation comprising a plurality of folding devices as illustrated in FIGS. 2 to 8.
    [0006] DETAILED DESCRIPTION OF EMBODIMENTS FIG. 1 illustrates a corrugated metal plate 1 for the formation of a sealed membrane of a liquefied natural gas storage tank. The metal plate 1 comprises a first series of parallel corrugations 2, said low, extending in a direction y and a second series of parallel corrugations 3, said high, extending in a direction x. The x and y directions of the series of undulations are perpendicular. The corrugations 2, 3 protrude from the side of the inner face of the metal plate 1, intended to be placed in contact with the fluid contained in the tank. The edges of the metal plate 1 are here parallel to the corrugations 2, 3. Note that the terms "high" and "low" have a relative meaning and mean that the undulations 2, said low, have a height less than the undulations 3, say high. The metal plate 1 comprises between the undulations 2, 3, a plurality of flat surfaces 4. At each crossing between a low corrugation 2 and a high corrugation 3, the metal plate 1 comprises a node zone 5. The node zone 5 comprises a central portion 6 having an apex projecting towards the inside of the tank. Moreover, the central portion 6 is bordered, on the one hand, by a pair of concave corrugations 7 formed in the peak of the high corrugation 3 and, on the other hand, by a pair of recesses 8 into which the low ripple 2.
    [0007] The corrugations 2, 3 of the metal plate 1 allow the waterproofing membrane to be flexible in order to be deformed under the effect of thermal and mechanical stresses generated by the liquefied natural gas stored in the tank.
    [0008] The metal sheet 1 may in particular be made of stainless steel, aluminum, Invar ®: that is to say an alloy of iron and nickel whose expansion coefficient is typically between 1.2.10-6 and 2.10- 6 K-1, or in an iron alloy with a high manganese content whose expansion coefficient is typically of the order of 7.10-6 K-1. However, other metals or alloys are also possible. For example, the metal sheet 1 has a thickness of about 1.2 mm. Other thicknesses are also conceivable, knowing that a thickening of the metal sheet 1 causes an increase in its cost and generally increases the rigidity of the corrugations 2, 3.
    [0009] Figures 2 to 8 and 10 show a folding device for forming a low ripple as well as the node between this low ripple and a high ripple, in a metal sheet in which a high ripple has previously been formed. Referring to FIG. 2, it can be seen that the folding device comprises a fixed lower frame 9 and an upper pusher 10 which is mounted vertically movable relative to the lower frame 9. The device comprises a punch 11 carried by the upper pusher 10, and having, at its lower end, a head 12 having a shape corresponding to the shape of the corrugation to be shaped. The head 12 has a V-shaped section which extends along the entire length of the corrugation to be formed. The head 12 of the pusher is intended to engage, in the folding position, inside a cavity 13, of complementary shape, formed in a lower die carried by the lower frame 9. The upper pusher 10 must be fit to exert a pressure of the order of 5 tons per node area to be formed. Thus, it will be possible to use a press capable of exerting a pressure of the order of 30 tons to achieve three knots whereas the presses used in the prior art must often have a much higher capacity, of the order of 150 knots. to 200 tons.
    [0010] The lower die consists of two die members 14, 15 which are slidably mounted horizontally on the lower frame 9 in a direction perpendicular to the direction of the corrugation to be formed between a spaced position and a close position. The matrix elements 14, 15 comprise an upper surface 16 for supporting the metal sheet. Each die element 14, 15 further comprises, at its edge vis-à-vis the other die element 14, 15, a half-recess, concave. Thus, when the two matrix elements 14, 15 are in a close position, the half-imprints together form the imprint 13, corresponding to the shape of the corrugation to be shaped. Returning members, not shown in Figure 2, provide a return of the two matrix elements 14, 15 to their spaced apart position. Furthermore, the pusher 10 also carries two sidewall clamps 17, 18 extending on either side of the punch 11. Each side clamp 17, 18 is disposed opposite a matrix element 14 , 15 respectively. The flanks 17, 18 being carried by the pusher 10, they are able to be moved between a rest position and a clamping position in which they press the metal sheet against the bearing surface 16 of the matrix elements 14, 15, when the pusher 10 is moved to the lower frame 9. The flanks 17, 18 are mounted vertically movable relative to the pusher 10. In the embodiment shown, each flange 17, 18 is mounted sliding vertically on a support plate 19, 20 via a guide device comprising a plurality of guide tubes 21 secured to said flange 17, 18 and slidably mounted in bores in the support plate 19, 20. Springs 22 exert a force of recall between each support plate 19, 20 and the clamp 17, 18 vis-à-vis. Thus, the movements of the flanks 17, 18 towards their clamping position and the punch 11 towards its bending position can be ensured simultaneously by the displacement of the pusher 10. In addition, the clamping force between the flanks 17, 18 and the lower die is controlled by means of the springs 22. Note that, in an embodiment not shown, the springs 22 are replaced by gas cylinders, also called gas spring, having a fixed end to a support plate 19, 20 and a second end attached to the flank 17, 18 vis-à-vis. Alternatively, the springs 22 may also be replaced by hydraulic or pneumatic cylinders.
    [0011] The flanks 17, 18 are also slidably mounted horizontally on the upper pusher 10 in a direction perpendicular to the longitudinal direction of the corrugation to be formed. To do this, each support plate 19, 20 is secured to carriages 23 which are slidably mounted on guide rails 24 carried by the upper pusher 10. In order to almost eliminate the friction between the carriages 23 and the guide rails 24 , the carriages 23 are advantageously bearing carriages which comprise a plurality of rolling bodies capable of cooperating with bearing paths carried by the guide rail. The flanks 17, 18 are thus slidably mounted on the upper pusher 10 between a spaced position and a close position. Furthermore, one or more return members, not shown, provide a return of the flanks 17, 18 to their spaced position. By way of example, the return members are springs which comprise a first end bearing against a lateral face of the punch 11 and a second end bearing against the movable carriage 23 or against the support plate 19, 20 to face. In FIGS. 3 to 8, the upper pusher 10 as well as the guide and return means of the flanks 17, 18 are not shown. In addition, the flanks 17, 18 are shown in a clamping position of the metal plate against the bearing surfaces 16 of the matrix elements 14, 15. The matrix elements 14, 15 and the flanks 17, 18 are shown, in spaced position, in FIGS. 3 and 5 to 8, and in a close position, in FIG. 4. As represented in FIGS. 3 and 4, each matrix element 14, 15 is secured to mounted carriages 25. sliding horizontally, in the direction x, on guide rails 26 carried by the lower frame 9. The carriages 25 are advantageously bearing carriages which comprise a plurality of rolling bodies capable of cooperating with bearing tracks carried by the rail of guidance 26. The return members, providing a return of the two matrix elements 14, 15 to their spaced position are here springs 27, shown in Figure 3, which are supported between the two matrix elements e 14, 15.
    [0012] On the other hand, FIGS. 3 and 4 also show that the matrix elements 15, 16 each comprise a groove 28 extending in the direction x, perpendicular to the direction y of the cavity 13. The grooves 28 are for receiving the high corrugation previously formed in the metal plate. The grooves 28 thus have a V-shaped section, complementary in shape to that of the high corrugation. Similarly, the flanks 17, 18 each comprise a male member 29 projecting, directed downwards, extending in the x direction and having a V shape complementary to that of the high corrugation.
    [0013] Therefore, in operation, when the flanks 17, 18 are positioned in their clamping position, the preformed high corrugation is maintained between the male members 29 of the flanks 17, 18 and the grooves 28 of the matrix members 15. , 16. Thus, clamping of the metal plate is also performed at the high preformed corrugation when forming a low corrugation. The head 12 of the punch 11 comprises a finger 38, represented in FIG. 6, projecting from the head 12 in the direction of the lower frame 9 and arranged opposite the intersection zone between the half-impressions and the grooves 28 of the first and second die members 14, 15. The finger 38 has a lamella shape which is able to deform the intersection zone between the high undulation and the low undulation so as to form a projecting peak. In an embodiment not shown, the finger is removable vertically and able to retract once the initiation of deformation of the top of the node started. Furthermore, the folding device is also equipped with knives 30, 31, shown in Figures 5 and 6, for shaping the concave corrugations 7 in the peak of the high undulation of the metal plate, on either side crossing between the high preformed corrugation and the low corrugation to be formed. The knives 30, 31 have a blade 32 directed upwards and extending parallel to the direction of the impression 13.
    [0014] The knives 30, 31 are slidably mounted on the lower frame 9, in the x direction of the grooves 28 between a spaced position and a close position. To do this, the knives 30, 31 are each mounted on a carriage 33 slidably mounted on a guide rail 34. Furthermore, the guide rails 34 are carried by a knife support member 35 which is mounted vertically movable relative to The folding device is also equipped with an actuating mechanism, described below, which is able to move the support member of the knives 35 upwards so that said knives 30, 31 are moved. in a high folding position, when the punch 11 moves down towards its folding position. Feedback members provide a return of the knives 30, 31 to their spaced apart position. The return members here are springs 36 which act between the support member of the knives 35 and said knives 30, 31.
    [0015] So that the knives 30, 31 can come to deform the high corrugation on both sides of the intersection between the high undulation and the low undulation, the matrix elements 14, 15 each have a notch 37 at the level of the intersection between their half-shaping recess of the low undulation and their housing groove 28 of the high undulation.
    [0016] Figures 7 and 8 show the knife operating mechanism which is arranged to move the knife support member 35 upwardly as the punch 11 is driven to its folding position. The actuating mechanism comprises two levers 39, 40. The levers 39, 40 are arranged in the space formed between the two matrix elements 14, 15. The levers 39, 40 are mounted articulated on the upper frame 9 around an axis of rotation parallel to the x direction of the grooves 28. The levers 39, 40 each comprise a first end 41 intended to cooperate, in operation with a portion of the metal sheet to be folded by the punch 11. Moreover, the levers 39, 40 have a second end 43 cooperating with the movable support member knives 35 to move it upwards. The first end 41 of the levers 39, 40 carries a contact piece 42 which, on the one hand, is articulated on the first end 41 of the levers 39, 40, and, on the other hand, comprises a flat support soleplate intended to cooperate with the metal sheet. Such an arrangement makes it possible to obtain a surface of contact between the lever 39, 40 and the metal sheet that is substantially constant during the pivoting of the levers 39, 40. Furthermore, the second end 43 of the levers 39, 40 cooperates with a rim 44 carried. by the knife support member 35. In operation, when the punch 11 comes into contact with the portion of the metal sheet to be bent, the punch 11 will exert on the first ends 42 of the levers 39, 40 a force tending to the rotate so that the second end 42 of the levers 39, 40 acts on the rim 44 of the knife support member 35 and the knives 30, 31 moves to their upper folding position in which they deform the ridge from the high ripple of the metal plate. When the bending of the corrugation is completed and the punch 11 is raised, the knife support member 35 returns to its lower rest position under the effect of gravity. It can be observed in FIG. 6 that the blade support member 35 is slidably mounted on the lower frame 9 by means of a guide tube 44 fixed to the lower frame 9 and cooperating with a bore provided inside the frame. In addition, it is also observed that the levers are symmetrical with respect to one another with respect to a vertical plane passing through the axis of the grooves 28.
    [0017] The levers 39, 40 therefore pivot in opposite directions of rotation. Such an arrangement allows for a balanced knife actuation mechanism. The method of folding a corrugated metal sheet will now be described. In a first step, the metal sheet is placed on the bearing surfaces 16 of the first and second die elements 14, 15. The metal sheet is positioned so that its high preformed corrugation is positioned inside the grooves 28 of the matrix elements 15, 16. Thereafter, the upper pusher 10 is moved downward towards the lower frame 9. The clamps 17, 18 are thus positioned in their clamping position in which they clamp the sheet metal. against the bearing surfaces of the matrix elements (FIGS. 3 and 5 to 8). Then, the springs 22 extending between the flanks 17, 18 and the upper pusher 10 are compressed while the pusher continues to descend and the punch 11 deforms the metal sheet. Since the metal sheet is clamped between the flanks 17, 18 and the matrix elements 14, 15, the metal sheet, by deforming under the effect of the punch 11, exerts a traction force on the flanks 17, 18 and the matrix elements 14, 15, against their return members 27, to move them to their close position (Figure 4). Thus, the flanks 17, 18 and the matrix elements 14, 15 are moved to their close position synchronously with the movement of the punch 11 and without requiring dedicated actuating means.
    [0018] Moreover, likewise, when the head 12 of the punch 11 engages inside the cavity 13, the metal sheet exerts a force on the levers 39, 40 for actuating the knives 30, 31, which causes a movement of the knives 30, 31 to their upper folding position. In parallel, the metal sheet deforming exerts on the knives 30, 31 a tensile force which tends to slide them to their close position. When the head 12 of the punch 11 has reached its extreme position, the upper pusher 10 can then be brought upwards, away from the lower frame 9. Therefore, the knives 30, 31, the matrix elements 14, 15 and the flanks 17, 18 are automatically recalled by their respective biasing members 27, 36 to their spaced apart position. In connection with Figure 10, there is shown a folding plant having a plurality of folding devices A, B, C as described above. In the embodiment shown, the folding installation is intended to form at least one corrugation in a metal sheet having three preformed high undulations. Thus, to form this corrugation, three devices arranged -A, B, C are used one after the other in the y-direction. Spacer elements 45 can be arranged between the various folding devices A, B, C. Thus, by changing the dimensions of said spacer members 45 it is easy to vary the pitch between the high corrugations. Similarly, the folding installation may comprise several rows of folding devices A, B, C in order to be able to form a plurality of low corrugations in the same metal sheet, said rows being arranged one after the other in the x direction. Note however that in such a folding plant, it will be necessary to control the folding devices, sequentially, so that the low corrugations are successively shaped. Although the invention has been described in connection with several particular embodiments, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention. It will be noted in particular that such a folding device can also be used for forming the high corrugations of a metal plate. In such a case, the folding device can be simplified and not include a knife, groove formed in the matrix elements and male element formed in the clamps. The use of the verb "to include", "to understand" or "to include" and its conjugated forms does not exclude the presence of other elements or steps other than those set out in a claim. The use of the indefinite article "a" or "an" for an element or a step does not exclude, unless otherwise stated, the presence of a plurality of such elements or steps. In the claims, any reference sign in parentheses can not be interpreted as a limitation of the claim.
    权利要求:
    Claims (13)
    [0001]
    REVENDICATIONS1. Folding device for forming a corrugation (2) in a metal sheet (1) for the construction of a sealed membrane of a fluid storage vessel, the folding device comprising: - a lower frame (9); a lower die comprising a first and a second die element (14, 15) each having a bearing surface (16) of the metal sheet (1) and a concave half-cavity, the first and second die elements ( 14, 15) being each slidably mounted on the lower frame (9), in a direction x, so as to be slidable between a spaced position and a close position, the half-impressions of the first and second die members (14, 15) together defining an imprint (13) corresponding to the shape of the corrugation to be formed when the first and second die members (14, 15) are in their close position, said first and second die members (14, 15) being biased towards their spaced apart position by a first return member (27); - an upper punch (11), arranged above the lower die, having a lower end provided with a head (12) having a shape complementary to that of the cavity (13), said upper punch being vertically movable by relative to the lower frame (9) between a rest position and a folding position in which the head (12) of said upper punch (11) is engaged inside the cavity (13) of the lower die so as to squeeze the metal sheet (1); and a first and a second sidewall (17, 18) extending on either side of the upper punch (11), above the lower die, respectively vis-à-vis the first and second die elements (14, 15), said first and second flanks (17, 18) being slidably mounted in the x-direction between a close position and a spaced apart position and being biased towards their spaced apart position by a second member recall ; the first and second flanks (17, 18) being movable vertically relative to the lower frame (9) between a relaxed position and a clamping position in which the first and second flanks (17, 18) are brought together respectively of the support surface (16) of the first die element (14) and the second die element (15) so as to clamp the metal sheet (1) against the bearing surface of the first and second die elements ( 14, 15) so that, in operation, when the metal sheet (1) is clamped between the flanks (17, 18) and the matrix elements (14, 15), the displacement of the upper punch (11) from its rest position to its folding position causes the metal sheet (1) to bend, in which the metal sheet (1) transmits a traction force in the x-direction to the die elements (14, 15) and the clamps. flanks (17, 18) and thus moves the matrix elements (14, 15) and the side-flanks (17, 18) to their close position.
    [0002]
    Folding device according to claim 1 for forming a corrugation (2) in a metal sheet (1) having a preformed corrugation (3) extending in a direction perpendicular to the corrugation (2) to be formed in wherein the first and second die members (14, 15) each have a V-shaped groove (28) for receiving said preformed corrugation (3).
    [0003]
    Folding device according to claim 2, wherein the flanks (17, 18) each comprise a male element (29), projecting towards the lower frame (9), having a shape of V which is adapted to to be introduced into the groove (28) of the die element (14, 15) vis-à-vis, when the clamps (17, 18) are in their clamping position.
    [0004]
    4. Folding device according to claim 2 or 3, wherein the head (12) of the punch (11) comprises a finger (38) projecting from the head towards the lower frame (9) and arranged vis-à- screw of the intersection zone between the cavity (13) and the grooves (28) of the first and second matrix elements (14, 15).
    [0005]
    5. Folding device according to any one of claims 2 to 4, comprising two knives (30, 31) for deformation of the preformed corrugation (3), on either side of the intersection between the corrugation. preformed (3) and the corrugation to be formed (2), the two knives (30, 31) being arranged on either side of the intersection zone between the cavity (13) and the grooves (28) of the first and second matrix elements (14, 15); said knives (30, 31) being slidably mounted on the lower frame (9) in the x-direction between a spaced position and a close position and being biased towards their spaced apart position by a third biasing member (36), said knives (30 , 31) being further mounted vertically relative to the lower frame (9) between a low rest position and a high folding position in which they are able to deform the preformed corrugation (3), the device further comprising a mechanism knife actuating device which is arranged to move the knives (30, 31) to their upper folding position when the punch (11) is moved to its folding position.
    [0006]
    6. Folding device according to claim 5, wherein the knife actuating mechanism comprises a movable blade support member (35) mounted vertically movable on the lower frame (9) and two levers (39) which are each mounted articulated on the lower frame (9); the levers (39) each comprising: a first end provided with a bearing surface, extending inside the cavity (13) of the lower die and able to cooperate, in use, with a portion of the metal sheet (1) intended to be folded to form the corrugation (2), so that the lever (39) pivots when the upper punch (11) moves towards its folding position; and a second end cooperating with the movable knife support member (35) so that the movable knife support member is moved upwards when, due to a movement of the upper punch (11) to its folding position, the lever (39) pivots.
    [0007]
    Folding device according to claim 6, wherein the knives (30, 31) are each carried by a carriage (33) slidably mounted on a respective guide rail (34) and wherein said guide rails (34) are carried by the movable support member of the knives (35).
    [0008]
    8. Folding device according to any one of claims 1 to 7, comprising an upper pusher (10) mounted vertically movable relative to the lower frame (9); the upper punch (11) being carried by the upper pusher (10); the first and second flanks (17, 18) being slidably mounted vertically respectively on first and second support plates (19, 20); said first and second support plates (19, 20) being slidably mounted in the x direction on the upper pusher (10) to allow movement of the flanks (17, 18) between their close position and their spaced apart position; each flank (17, 18) being further recalled at a distance from its respective support plate by return members (22).
    [0009]
    9. Folding device according to claim 8, wherein the return members exerting a return force between each clamp (17, 18) and its respective support plate (19, 20) are springs, gas cylinders. , hydraulic cylinders or pneumatic cylinders.
    [0010]
    Folding plant comprising a plurality of folding devices according to any one of claims 1 to 9.
    [0011]
    11. Folding method for forming a corrugation (2) in a metal sheet (1) for the construction of a sealed membrane of a fluid storage tank by means of a folding device comprising: - a lower frame (9); a lower die having first and second die members (14, 15) each having a bearing surface (16) of the metal sheet (1) and a concave half-cavity, the first and second die members (14); , 15) being each slidably mounted on the lower frame (9), in a direction x, so as to be slidable between a spaced apart position and a close position, the half-impressions of the first and second die members (14, 15 ) together defining an imprint (13) corresponding to the shape of the corrugation to be formed when the first and second die members (14, 15) are in their close position, said first and second die members (14, 15) being recalled to their position separated by a first return member (27); an upper punch (11), arranged above the lower die, having a lower end provided with a head (12) having a shape complementary to that of the cavity (13), said upper punch being vertically movable relative to at the lower frame (9) between a resting position and a folding position in which the head (12) of said upper punch (11) is engaged inside the cavity (13) of the lower die so as to press the metal sheet (1); and a first and a second sidewall (17, 18) extending on either side of the upper punch (11), above the lower die, respectively vis-à-vis the first and second die elements (14, 15), said first and second flanks (17, 18) being slidably mounted in the x direction between a close position and a spaced apart position and being biased towards their spaced apart position by a second biasing member ; the first and second flanks (17, 18) being movable vertically relative to the lower frame (9) between a relaxed position and a clamping position in which the first and second flanks (17, 18) are brought together respectively of the bearing surface (16) of the first die member (14) and the second die member (15) so as to clamp the metal sheet (1) against the bearing surface of the first and second die members (14, 15); said folding method comprising: positioning a metal sheet (1) bearing against the bearing surfaces (16) of the first and second die members (14, 15); the displacement of the first and second flanks (17, 18) in their clamping position in which the first and second flanks (17, 18) clamp the metal sheet (1) respectively against the bearing surface of the first die element (14) and the second die element (15); the displacement of the upper punch (11) towards its folding position in which the head (12) of the upper punch (11) presses the metal sheet (1) inside the cavity (13) of the lower die in order to forming a corrugation (2), said displacement of the upper punch from its rest position to its folding position causing a folding of the metal sheet so that the metal sheet transmits a traction force in the x direction to the matrix elements ( 14, 15) and to the flanks (17, 18) and thereby moves the die members (14, 15) and the flanks (17, 18) to their close position.
    [0012]
    Folding method according to claim 11, wherein the metal sheet to be folded comprises a preformed corrugation (3) and the first and second die elements (14, 15) each comprise a groove (28) in the form of a V; and wherein when positioning the metal sheet (1) bearing against the bearing surfaces (16) of the first and second die members (14, 15), the preformed corrugation is engaged within the grooves (28).
    [0013]
    13. Folding method according to claim 12, wherein the folding device comprises two knives (30, 31) for deformation of the preformed corrugation (3), on either side of the cross between the corrugation. preformed (3) and the undulation to be formed (2), the two knives (30, 31) being arranged on either side of the intersection zone between the cavity (13) and the grooves (28) of the first and second matrix elements (14, 15); said knives (30, 31) being slidably mounted on the lower frame (9) in the x-direction between a spaced position and a close position and being biased towards their spaced apart position by a third biasing member (36), said knives (30 , 31) being further mounted vertically movable relative to the lower frame (9) between a low rest position and a high folding position in which they are able to deform the preformed corrugation (3), the device further comprising a knife actuating mechanism which is arranged to move the knives (30,31) to their high folding position when the punch (11) is moved to its folding position; and wherein: the movement of the upper punch (11) towards its folding position causes, on the one hand, a movement of the knives (30, 31) towards their upper folding position, and, on the other hand, a folding of the sheet metal such that the metal sheet transmits a traction force in the x direction to the knives (30, 31) and thereby moves the knives (30, 31) to their close position.
    类似技术:
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    同族专利:
    公开号 | 公开日
    WO2015170054A1|2015-11-12|
    FR3020769B1|2017-01-06|
    EP3140058B1|2018-03-07|
    US10335844B2|2019-07-02|
    KR20170003583A|2017-01-09|
    CN106457335A|2017-02-22|
    CN106457335B|2018-07-13|
    EP3140058A1|2017-03-15|
    KR102353810B1|2022-01-20|
    US20170066027A1|2017-03-09|
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    CN202621668U|2012-06-20|2012-12-26|浙江万金机械有限公司|Ribbing device for food motor shaft|FR3025121B1|2014-08-28|2017-03-03|Gaztransport Et Technigaz|FOLDING DEVICE AND METHOD FOR FORMING CORRUGATION IN AN ANGLE PIECE|
    FR3057184B1|2016-10-06|2018-11-16|Gaztransport Et Technigaz|FOLDING MACHINE FOR FORMING A CORRUGATION IN A METAL SHEET|
    FR3057185B1|2016-10-06|2018-11-16|Gaztransport Et Technigaz|FOLDING MACHINE FOR FORMING A CORRUGATION IN A METAL SHEET|
    FR3061046B1|2016-12-23|2019-05-24|Gaztransport Et Technigaz|FOLDING DEVICE FOR FORMING A CORRUGATION IN A METAL SHEET AND METHOD OF USING THE SAME|
    CN107952850B|2017-12-06|2019-02-05|湖北三环锻压设备有限公司|A kind of bending method of steel corrugated workpiece automatic moulding|
    FR3080547B1|2018-04-27|2020-04-24|Gaztransport Et Technigaz|FOLDING DEVICE FOR FORMING A CORRUGATION IN A METAL SHEET|
    FR3095355B1|2019-04-29|2021-10-29|Gaztransport Et Technigaz|Folding system to form a corrugation in a room and method of using the device|
    KR102307811B1|2020-10-29|2021-10-01|주식회사 에스디에스|LNG cryogenic liquefied natural gas marine transport container manufacturing method|
    法律状态:
    2015-06-01| PLFP| Fee payment|Year of fee payment: 2 |
    2015-11-13| PLSC| Publication of the preliminary search report|Effective date: 20151113 |
    2016-05-27| PLFP| Fee payment|Year of fee payment: 3 |
    2017-05-30| PLFP| Fee payment|Year of fee payment: 4 |
    2018-05-28| PLFP| Fee payment|Year of fee payment: 5 |
    2020-02-14| ST| Notification of lapse|Effective date: 20200108 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1454078A|FR3020769B1|2014-05-06|2014-05-06|FOLDING DEVICE AND METHOD FOR FORMING CORRUGATION IN A METAL SHEET|FR1454078A| FR3020769B1|2014-05-06|2014-05-06|FOLDING DEVICE AND METHOD FOR FORMING CORRUGATION IN A METAL SHEET|
    EP15725828.6A| EP3140058B1|2014-05-06|2015-05-06|Folding device for forming a corrugation in a metal sheet and method for using a folding device|
    PCT/FR2015/051203| WO2015170054A1|2014-05-06|2015-05-06|Folding device for forming a corrugation in a metal sheet and method for using a folding device|
    US15/308,424| US10335844B2|2014-05-06|2015-05-06|Folding device for forming a corrugation in a metal sheet and method for using a folding device|
    CN201580023180.8A| CN106457335B|2014-05-06|2015-05-06|For the bending apparatus of formation ripple in sheet metal and use the method for bending apparatus|
    KR1020167032471A| KR102353810B1|2014-05-06|2015-05-06|Folding device for forming a corrugation in a metal sheet and method for using a folding device|
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