CN110114159B - Bending device for forming corrugations in a metal sheet and method of using said device - Google Patents
Bending device for forming corrugations in a metal sheet and method of using said device Download PDFInfo
- Publication number
- CN110114159B CN110114159B CN201780080021.0A CN201780080021A CN110114159B CN 110114159 B CN110114159 B CN 110114159B CN 201780080021 A CN201780080021 A CN 201780080021A CN 110114159 B CN110114159 B CN 110114159B
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- longitudinal direction
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- 238000005452 bending Methods 0.000 title claims abstract description 49
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 38
- 239000002184 metal Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 6
- 230000007704 transition Effects 0.000 claims abstract description 36
- 238000000465 moulding Methods 0.000 claims description 9
- 239000012528 membrane Substances 0.000 description 16
- 238000007789 sealing Methods 0.000 description 13
- 230000003014 reinforcing effect Effects 0.000 description 10
- 239000012530 fluid Substances 0.000 description 6
- 239000003949 liquefied natural gas Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910001374 Invar Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/24—Making hollow objects characterised by the use of the objects high-pressure containers, e.g. boilers, bottles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a bending device for forming corrugations in a metal sheet (1), comprising: -a first punch (11) comprising a head (14) having a V-shaped section and comprising at least one first portion (41) and two second portions (35) arranged on either side of the first portion (41) in the longitudinal direction, the first portion (41) being connected to each of the second portions (35) by a transition zone (38, 54); -a mould (13) comprising at least one first portion (42) and two second portions (43), said two second portions (43) being arranged on either side of said first portion (42) in a longitudinal direction; the two transition zones (38, 54) are each arranged facing one of the second portions (43) of the mould (13) and can be accommodated therein during a bending operation.
Description
Technical Field
The present invention relates to a bending (folding) device (machine) for forming corrugations in a metal sheet and a method of using the same.
More specifically, the present invention relates to the field of sealed and thermally insulated membrane tanks for storing and/or transporting fluids (such as cryogenic fluids), wherein corrugated metal sheets obtained by means of a folding device according to the invention are used in particular for constructing sealing membranes of such tanks.
Background
Corrugated sealing membranes for forming coatings for liquefied natural gas storage tanks are known in the prior art. Each sealing membrane is formed by a plurality of metal plates having a series of vertical corrugations to allow said plates to deform under the action of thermal and mechanical stresses generated by the fluid stored in the tank.
Such a corrugated sealing membrane is disclosed, for example, in document WO 16034782. The corrugated membrane includes a first series of parallel corrugations extending in a first direction and a second series of parallel corrugations extending in a second direction perpendicular to the first direction.
To manufacture such a sealing membrane, first, a first series of corrugations is formed, then, secondly, a second series of corrugations is formed, and nodes are formed at the junctions of the first and second series of corrugations.
The above-mentioned document WO 16034782 discloses a bending device for forming a first series of corrugations. The bending device includes a die supported by a lower frame and a punch supported by an upper frame. Each punch is adapted to engage within one of the dies to form corrugations as the upper frame is moved downwardly toward the lower frame from its rest position to its bent position.
In one embodiment described and illustrated with reference to figures 10 and 12 of the aforementioned document WO 16034782, the punch and the die each have alternating portions of a first type and a second type. Said first type of portion has a semi-elliptical shape and therefore allows the corrugations to have their final shape, while said second type of portion has a substantially triangular shape and allows the corrugations to have a geometry that allows them to be subsequently bent in a vertical direction. Thus, during a single bending step, on the one hand, the corrugations are shaped to have their final shape in areas that will not be subsequently reworked to form the node areas, and on the other hand, the corrugations are shaped to allow the node areas to be subsequently formed in areas that will be re-bent during a subsequent bending step.
According to a first variant, the parts of the punch and of the die of the first and of the second type are separated from each other by a free space so as to create a transition zone between the parts of the first and of the second type. However, this arrangement is not entirely satisfactory, since the use of free space may lead to inaccuracies in the positioning of the respective parts of the first type and the second type.
According to a second variant, the portions of the punch and of the die of the first type and of the second type are separated from each other by a transition zone. However, this arrangement is not entirely satisfactory, since it requires a very precise relative positioning of the various zones, otherwise the corrugations formed in the transition zones have irregularities that may destroy the mechanical properties of the metal sheet.
Disclosure of Invention
The basic idea of the present invention is to provide a bending device for forming corrugations in a metal sheet, which is simple and precise and allows the corrugations to be produced in a single bending step, having a formed zone which assumes its final shape, and at least one unformed zone which assumes a shape which allows the subsequent formation of nodal regions in said unformed zone.
According to one embodiment, the present invention provides a bending device for forming corrugations in a metal sheet, the bending device comprising:
-a first frame and a second frame, which are vertically movable with respect to each other between a rest position and a bending position;
-a first frame supporting a punch corresponding to the shape of the corrugation to be formed and extending in a longitudinal direction;
-a second frame supporting a die having a die cavity arranged to face the punch and arranged such that the punch engages within the die cavity to press the metal sheet between the punch and the die cavity when one of the first and second frames is moved relative to the other between the rest position and the bending position;
-a first punch comprising a head having a substantially V-shaped section (cross-section) and comprising at least one first portion and two second portions, said two second portions being arranged on either side of said first portion in the longitudinal direction, said first portion being connected to each of the second portions by a transition zone, the first and second portions each comprising two sides meeting at a peak so as to define a substantially V-shaped section, the sides of the first portion being flat and the sides of the second portion being arc-shaped and convex;
-a mould cavity comprising at least one first portion and two second portions arranged on either side of the first portion in a longitudinal direction; the first and second portions of the mould cavity have sections that match sections (in cross-section) of the first and second portions of the head, respectively;
-a first portion of the head is arranged to face a first portion of the mould cavity and a second portion of the head is arranged to face each of the second portions of the mould cavity respectively;
two transition zones are provided facing each of the second portions of the mould cavity respectively and receivable in each of the second portions of the mould cavity when one of the first and second frames is moved relative to the other from its rest position to its bent position.
Thus, during a single bending step, on the one hand, the corrugations are shaped so as to have their final shape in regions which are not subsequently intended to be reworked to form the node zones, and on the other hand, during a subsequent bending step, the corrugations assume a shape which allows the node zones to be subsequently formed in the regions to be bent. Furthermore, this arrangement is easy to implement, since the various parts of the punch and die can abut each other without free space, which may lead to additional positioning errors, said free space being arranged between the various zones, and the die cavity not having a transition zone whose position along the x-axis must correspond exactly to the position of the transition zone of the head.
According to advantageous embodiments, such a bending device may have one or more of the following features.
According to one embodiment, the first portion of the head has a dimension in the longitudinal direction greater than the dimension of the first portion of the moulding cavity, is arranged so that it has two ends arranged to face each of the second portions of the moulding cavity respectively and to be able to be housed in each of the second portions of the moulding cavity when one of the first and second frames is moved with respect to the other from its rest position to its bent position.
According to one embodiment, each transition comprises two sides meeting at a peak, each having a flat and inclined surface with respect to the longitudinal direction, so as to connect one of the curved sides of the second part of the head with one of the flat sides of the first part of the head.
According to one embodiment, each transition zone comprises two flat surfaces extending in a joining plane transverse to the longitudinal direction and connecting one of the arched sides of the second portion of the head with one of the flat sides of the first portion of the head.
According to one embodiment, the first portion of the head has two ends, each end extending in a plane orthogonal to the longitudinal direction.
According to one embodiment, each transition zone extends between two transverse planes, which are orthogonal to the longitudinal axis of the corrugation to be formed.
According to one embodiment, the first portion of the head has two ends, each end extending in a plane transverse to the longitudinal direction and inclined with respect to the longitudinal direction, such that the size of the first portion of the head increases in the longitudinal direction towards the peak.
According to one embodiment, the first portion of the mold cavity has two ends, each end extending in a plane transverse to the longitudinal direction and inclined with respect to the longitudinal direction, such that the size of the first portion of the mold cavity increases in the longitudinal direction towards the peak.
According to one embodiment, each transition zone extends between two transverse planes which are inclined with respect to the longitudinal axis of the corrugation to be formed.
According to one embodiment, the punch comprises at least one first element and two different second elements, the second elements being arranged on either side of the first element in the longitudinal direction, the first element forming at least partially a first portion of the head, the second elements each forming one of the second portions of the head and one of the transition zones of the head.
According to one embodiment, the second elements of the mould also form part of the first portions of the head respectively.
According to another embodiment, the punch comprises at least one first element and two distinct second elements, said second elements being arranged on either side of said first element in the longitudinal direction, said first elements forming a first portion of the head and said second elements each forming one of the second portions of the head, the transition zones being produced at the junction between the first and one of the second elements of the head, respectively.
According to one embodiment, the mould comprises at least one first element and two different second elements arranged on either side of said first element in the longitudinal direction; the first and second members of the mold form first and second portions of the mold cavity, respectively.
According to one embodiment, the head comprises n first portions and n +1 second portions, where n is an integer, each of the first portions of the head being arranged between two of the second portions of the head and being connected to said second portions by a transition zone,
the mold cavity comprises n first portions and n +1 second portions, each first portion of the head being arranged to face one of the first portions of the mold cavity and the second portions of the head being arranged to face one of the second portions of the mold cavity, respectively; and
two transition zones between each first portion of the head and two adjacent second portions respectively face each of the second portions of the moulding cavity, each of the second portions of the moulding cavity being adjacent to the first portion of the moulding cavity facing the first portion of the head, so that they can be accommodated in each of the second portions of the moulding cavity when one of the first and second frames is moved with respect to the other from its rest position to its bent position.
The present invention also provides, according to one embodiment, a method for using a bender, comprising:
-positioning the metal sheet relative to the mould; and
-moving one of the first and second frames relative to the other from its rest position to its bent position.
Drawings
The invention will be better understood and further objects, details, characteristics and advantages thereof will become more apparent in the following description of several specific embodiments of the invention, provided purely by way of non-limiting illustration, with reference to the accompanying drawings, in which:
figure 1 is a view of a corrugated metal sheet for constructing a sealing membrane of a tank for storing liquefied gas such as natural gas;
figure 2 shows a stiffening element for inserting into the corrugations of the sealing membrane in order to stiffen said sealing membrane against the pressure of the fluid contained in the tank;
figure 3 is a perspective view of a bending device according to a first embodiment;
figure 4 is a side view of the punch and die of figure 3;
figure 5 is a perspective view showing the first element of the die and the first element of the punch of figures 3 and 4;
figure 6 is a front view of a first element of the punch shown in figure 5;
figure 7 is a front view of a first element of the mould shown in figure 5;
figure 8 is a perspective view showing a second element of the die and of the punch of figures 3 and 4;
figure 9 is a front view of a second element of the mould shown in figure 8;
figure 10 is a front view of a second element of the punch shown in figure 8;
FIG. 11 is a cross-section of the punch and the die in a bent position along the plane XI-XI of FIG. 4;
figure 12 is a perspective view of a punch and a die according to a second embodiment;
figure 13 is a side view of the punch and die of figure 11;
figure 14 is a schematic view of a punch and a die according to a third embodiment;
fig. 15 is a partial perspective view of a metal plate according to a variant.
Detailed Description
Figure 1 shows a corrugated metal sheet 1 for forming a sealing membrane of a tank for storing cryogenic fluids such as liquefied natural gas.
The metal sheet 1 comprises a first series of parallel corrugations 2, called lower corrugations, extending in the y-direction, and a second series of parallel corrugations 3, called upper corrugations, extending in the x-direction. The directions x and y of these series of corrugations are perpendicular. The corrugations 2, 3 protrude from the sides of the inner face of the metal plate 1 to come into contact with the fluid contained in the tank. In this case the edges of the metal sheet 1 are parallel to the corrugations 2, 3. It should be noted that the terms "upper" and "lower" have opposite meanings and indicate that the height of the corrugations 2, called lower corrugations, is lower than the height of the corrugations 3, called upper corrugations. Furthermore, in one embodiment, not shown, the corrugations 2, 3 have the same height.
The metal sheet 1 comprises a plurality of flat surfaces 4 between the corrugations 2, 3. At each intersection between the lower corrugation 2 and the upper corrugation 3, the metal sheet 1 comprises a nodal region 5. The nodal region 5 includes a central portion 6 having peaks projecting towards the interior of the tank. Furthermore, on the one hand the central portion 6 is delimited by a pair of concave corrugations 7 formed at the peaks of the upper corrugations 3 and on the other hand by a pair of stiffeners 8 in which the lower corrugations 2 penetrate.
The corrugations 2, 3 of the metal sheet 1 allow the sealing membrane to be flexible so as to be able to deform under the thermal and mechanical stresses generated by the liquefied natural gas stored in the tank.
In particular, the metal plate 1 may be made of stainless steel, aluminum, invar (i.e. with a coefficient of expansion generally of 1.2.10)-6To 2.10-6K-1Nickel-iron alloys in between), or high-manganese-iron alloys (typically with an expansion coefficient of about 7.10)-6K-1) And (4) preparing. However, other metals or alloys are also contemplated.
As an example, the thickness of the metal plate 1 is about 1.2 mm. Other thicknesses are also conceivable, wherein it will be appreciated that thickening the metal sheet 1 will increase its cost and will generally increase the rigidity of the corrugations 2, 3.
According to a first embodiment, fig. 3-11 show a bending device for forming first corrugations in a metal sheet and then at least one second corrugation perpendicular to the first corrugations. As an example, as disclosed in application WO2015170054, the second corrugations and the nodes at the intersections between the first corrugations and the second corrugations are likely to be subsequently produced by a bender.
As shown by the dotted lines in fig. 3, the bending device includes an upper frame 9 and a lower frame 10. The upper frame 9 is movable with respect to the lower frame 10 between an upper rest position and a lower folded position. The upper frame 9 and the lower frame 10 support a punch 11 and a die 12, respectively.
A punch 11 is provided above the die 12 and is intended to engage in a die cavity 13 of the die 12 when the upper frame 9 is moved with respect to the lower frame 8 from its rest position to its bending position, in order to press the metal sheet 1 between the punch 11 and the die 12, so as to form corrugations in the metal sheet 1.
The punch 11 comprises, at its lower end, a head 14 which extends in the longitudinal direction x, is parallel to the longitudinal direction of the corrugation to be formed, and has a shape corresponding to the shape of said corrugation. The head 14 has a substantially V-shaped section which is delimited by two side edges 15, 16 which are straightened out towards the horizontal. The head 14 extends in the x-direction over a length substantially equal to the dimension of the metal sheet 1 to be bent.
The die 12 has a hollow die cavity 13 for receiving the head 14 of the punch 11 when the upper frame 9 is moved from its rest position to its bent position. The mould cavity 13 extends in the x-direction and has a length substantially equal to the length of the head 14. The sections of the mould cavity 13 are also substantially V-shaped.
Furthermore, the two horizontal support surfaces 17, 18 laterally delimit the mould cavity 13 on both sides thereof. The horizontal bearing surfaces 17, 18 serve to support the metal sheet 1 before and during the bending operation. Each of the horizontal support surfaces 17, 18 is arranged below one of the two side edges 15, 16 of the punch 11, so that the side edges 15, 16 press the metal sheet 1 on both sides of the corrugations against the horizontal support surfaces 17, 18 when the upper frame 9 is in its bent position.
As shown in fig. 3 and 4, the punch 11 and the die 12 are each formed by a plurality of elements 19, 20a, 20b, 21, 22a, 22b placed end to end against each other in the x-direction. In the embodiment shown, the punch 11 comprises a first element 19 and two second elements 20a, 20b arranged in the x-direction on either side of the first element 19. Similarly, the mold 12 comprises a first element 21 and two second elements 22a, 22b arranged in the x-direction on either side of the first element 21.
The length of the first element 19 of the punch 11 is equal to the length of the first element 21 of the die 12. The first member 19 of the punch 11 is disposed at a position above the first member 21 of the die 12 such that the positions of both ends of the first member 19 of the punch 11 on the x-axis and the positions of both ends of the first member 21 of the die 12 coincide.
Similarly, the length of the second elements 20a, 20b of the punch 11 coincides with the length of the second elements 22a, 22b of the die 12. Each of the second elements 20a, 20b of the punch 11 is arranged above one of the second elements 22a, 22b of the die 12 and in a position such that the position of the two ends of said second elements 20a, 20b of the punch 11 on the X axis coincides with the position of the two ends of the second elements 22a, 22b of the opposite die 12.
The second elements 20a, 20b of the punch 11 and the second elements 22a, 22b of the die 12 are intended to give the corrugations their final shape, while the first element 19 of the punch 11 and the first element 21 of the die 12 are intended to give the corrugations a geometry that allows their subsequent deformation in order to form another corrugation along the y-axis, i.e. a corrugation perpendicular to the corrugation to be formed by the bending device in question. It will thus be appreciated that the purpose of the bending device described is to obtain a metal sheet in which the corrugations formed by the bending device will only be crossed by a single vertical corrugation.
In other embodiments, not shown, when the corrugation to be formed is to pass through n corrugations, the punch 11 and the die 12 respectively comprise n first elements 19, 21 and n +1 second elements 20a, 20b, 22a, 22b, each of the first elements 19, 21 of the punch 11 and the die 12 respectively being inserted between two second elements 20a, 20b, 22a, 22b of the punch 11 and the die 12 respectively.
Fig. 5 to 7 show the first element 19 of the punch 11 and the first element 21 of the die 12. The section of the head 14 near the first element 19 of the punch 11 has a substantially V-shape and is constant. As shown in fig. 6, the section has two substantially flat sides 23, 24 meeting at a peak 25. The peak 25 is circular. The section of the die cavity 13 near the first element 21 of the die 12 is also constant and its shape matches the shape of the head 14 near the first element 19 of the punch 11. In other words, as shown in fig. 7, the section also has two substantially flat sides 26, 27 that meet at a rounded peak 28.
Fig. 8 to 10 show one of the second elements 20a of the punch 11 and one of the second elements 22a of the die 12, with the same being true of the other second element 20b of the punch 11 and the other second element 22b of the die 12. The section of the die cavity 13 in the vicinity of the second element 20a of the die 11 is substantially V-shaped and constant. As shown in fig. 10, the segments have two arcuate and concave sides 29, 30 that meet at a rounded peak 31. The portion of the section of the head 14 itself in the vicinity of the second element 20a of the punch 11 is not constant. In the vicinity of each of its ends, the second element 20a of the punch 11 has the same section as the first element 19 of the punch 11. In other words, as shown in fig. 9, the head 14 has a section near said end of the second element 20a, said section having two flat sides 32, 33 meeting at a circular peak 34.
The head 14 of the second element 20a also has, outside its end, a portion 35 whose section matches that of the cavity 13 of the second element 22a of the mould 12. In other words, as shown in fig. 9, a section of the portion 35 has two curved and convex sides 36, 37 meeting at a peak. The peaks of the portion 35 are rounded and extend in the extension of the peaks 34 of the end of the second element 22 a.
Near the second element 20a of the punch 11, the head 14 has a transition zone 38 connecting the portion 35 to each of the ends of the second element 20 a. Each transition 38 has two sides 39, 40 that meet at a rounded peak. The peak extends in the extension of the portion 35 and the peak 34 at the end of the second element 20 a. The side faces 39, 40 each have a flat surface inclined with respect to the direction x, one of the curved side faces 36, 37 of the surface connection portion 35 being connected with one of the flat side faces 32, 33 of the end of the second element 20 a.
As shown in fig. 11, the section of the head 14 near the end of the second component 20a, 20b, such as near the transition region 38, is likely to be received within the section of the mold cavity 13 near the second component 22a, 22b of the mold 12.
As shown in fig. 4, the head 14 of the punch 11 therefore comprises:
a first portion 41, which extends from one of the ends of one of the second elements 20a to one of the ends of the other of the second elements 20a, passes through the first element 19, and a section of which has two flat sides 23, 24, 32, 33;
a second portion 35 having a section with two curved and convex sides 36, 37; and
The cavity 13 of the mold 12 includes:
a first portion 42, the section of which matches the section of the first portion 41 of the head 14; and
a second portion 43, the section of which matches the section of the second portion 35 of the head 14.
The transition zone 38 of the head 14 is arranged facing the second portion 43 of the mould cavity 13 and is accommodated in said second portion 43 when the upper frame 9 is moved to its bending position. This arrangement allows a simple and precise production of a corrugation having two zones with different sections and, in particular, without the need for a mould cavity 13 with a transition zone whose position along the x-axis corresponds to the position of the transition zone 38 of the head 14.
Furthermore, as mentioned above, although the distribution of the various portions 41, 38, 35 of the head 14 on the elements 19, 20b of the punch 11 is particularly advantageous, since it allows a simple manufacture of the punch 11, the invention is not limited to such an embodiment. It is therefore conceivable to make the head 14 in one piece or to include more or fewer elements 19, 20a, 20 b. Similar variations are also conceivable for the mold 12.
In one embodiment, as shown in fig. 15, the corrugation 3 to be formed may have one or more reinforcing indentations 55 in each portion of the corrugation 3 between two nodal regions 5. The purpose of such dimples 55 is to improve the pressure resistance of the corrugations. Each dimple 55 is generally concave and will be recessed from the inner face side of the metal plate 1. In order to produce such a reinforcing indentation 55 when bending the metal sheet 1, the second portion 43 of the die cavity comprises one or more protruding portions that protrude inwards beyond the rest of the second portion 43, while the second portion 35 of the head 14 of the punch 11 has a recessed portion that matches and faces said protruding portions.
In another embodiment, not shown, the corrugations have stiffening ribs in each part of the corrugation 3 between two nodal areas 5. The ribs are generally convex and they protrude from the sides of the inner face of the metal plate 1. In this case, the second portion of the head 14 of the punch 11 has one or more protruding portions that protrude towards the outside 43, while the second portion 43 of the die cavity 13 has a recessed portion of matching shape.
Fig. 12 and 13 show a bending device according to a second embodiment. This embodiment differs from the previous embodiment in that the ends of the respective portions 35, 38, 41, 42, 43 of the head 14 and of the cavity 13 extend in planes transverse and inclined with respect to the X axis, whereas in the previous embodiment they extend in planes orthogonal to the X axis. Each end of the first and second portions 41, 35 of the head 14 and each end of the first and second portions 42, 43 of the cavity 13 extend in a plane inclined with respect to the X-direction, so that, on the one hand, the dimensions of the first portions 41, 42 of the head 14 and of the cavity 13 along the X-axis increase towards their respective peak 25, 28, and, on the other hand, the dimensions of the second portions 35, 43 of the head 14 and of the cavity 13 along the X-axis decrease towards their respective peak 31. In this embodiment, the ends of the first and second elements 19, 20a, 20b, 21, 22b of the punch 11 and die 12 are correspondingly inclined.
Such a bending device is intended to produce corrugations in which each transition line between two zones having different shapes is inclined. This is particularly advantageous when the metal sheet 1 thus manufactured is intended to be associated with a reinforcing component 44, as shown in fig. 2.
The reinforcing component 44 comprises a hollow shell 45 which forms the body of the reinforcing component. The bottom wall 46 of the reinforcing member 44 is flat to be able to rest on the support of the membrane. The hollow shell 45 has an upper wall 47 whose shape allows the reinforcing element 44 to conform to the shape of the region of the corrugations in which it is inserted, i.e. to correspond to the shape-matching shape of the head 14 of the punch 11 of the bending device described above and of the second portions 35, 43 of the die cavity 13 of the die 12. Thin ribs 48 are provided within the hollow shell 45 to increase its rigidity, for example five ribs spread out around the central core in a star-shaped manner.
In the embodiment shown, the longitudinal ends 49 of the hollow shell 45 are cut along a plane inclined with respect to the longitudinal axis of the reinforcing component 44. The inclination of the longitudinal ends of the hollow shell 45 corresponds to the inclination of the transition between the two corrugated regions obtained by the bending device of fig. 12 and 13. This allows the contact surface between the reinforcing member 44 and the corrugations in which it is received to be increased, thereby helping to improve the effectiveness of the reinforcing member 44.
Fig. 14 schematically shows a bending device according to a third embodiment.
The punch 11 and the die 12 are formed by a plurality of first elements 50, 52 and a plurality of second elements 51, 53, respectively, which are arranged alternately with each other.
In the vicinity of the first element 50 of the punch 11, the head has a constant section similar to that shown in figure 6, whereas in the vicinity of the second element 51 of the punch, the head has a constant section similar to the portion 35 of the second element 20a of figure 9. Further, in the vicinity of the first member 52 and the second member 53 of the mold, the sections of the mold cavity correspond to the sections of the first member 21 shown in fig. 7 and the second member 22a shown in fig. 10, respectively.
In this embodiment, the transition zones 54 between the various portions of the head of the punch 11 are produced at the junction between the first element 50 and the second element 51, respectively. Thus, the transition zone is formed by a surface orthogonal to the x-axis of the end of the second element 51, which connects the curved side of the segment of the second element 51 with the flat side of the segment of the adjacent first element 50.
The dimension of the first element 50 of the punch 11 in the x direction is greater than the dimension of the corresponding first element 52 of the die 12. Furthermore, each first element 50 of the punch 11 is arranged so that its two longitudinal ends are respectively above each of two second elements 53 of the die 12, which are arranged on either side of the first element 52 of the corresponding die 12. Thus, as with the previous embodiment, the transition zone 54 is located above the second element 53.
Although the invention has been described with reference to several particular embodiments, it is clear that it is in no way limited thereto and that the invention comprises all technical equivalents of said means and their combinations if they fall within the scope of the invention.
In particular, although in the embodiment described above the various elements 21, 22a, 22b, 52, 53 of the mould 12 are formed as a single piece, the invention is also applicable to mould elements comprising two side portions and a central portion that is mobile with respect to said two side portions, as disclosed in application WO 16034782.
Use of the verb "comprise" or "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim.
In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Claims (11)
1. A bending device for forming corrugations in a metal sheet (1), the bending device comprising:
-a first frame (9) and a second frame (10) which are vertically movable with respect to each other between a rest position and a bending position;
-said first frame (9) supports a punch (11) corresponding to the shape of the corrugations to be formed and extending in a longitudinal direction;
-the second frame (10) supports a die (12) having a die cavity (13), the die cavity (13) being arranged facing the punch (11) and being arranged so that the punch (11) is engaged within the die cavity (13) so as to press the metal sheet (1) between the punch (11) and the die cavity (13) when one of the first frame (9) and the second frame (10) is moved with respect to the other between a rest position and a bending position;
-the punch (11) comprises a head (14), the head (14) having a substantially V-shaped section and comprising at least one first portion (41) and two second portions (35), which are arranged on either side of the first portion (41) in the longitudinal direction, the first portion (41) being connected to each of the second portions (35) by a transition zone (38, 54), each of the first and second portions comprising two sides (23, 24, 32, 33, 36, 37) meeting at a peak (25, 34) so as to define the substantially V-shaped section, the sides (23, 24, 32, 33) of the first portion (41) being flat and the sides (36, 37) of the second portion (35) being arc-shaped and convex;
-the mould cavity (13) comprises at least one first portion (42) and two second portions (43), the second portions of the mould cavity being arranged on either side of the first portion (42) in the longitudinal direction, the first portion (42) and the second portion (43) of the mould cavity (13) having sections matching sections of the first portion (41) and the second portion (35) of the head (14), respectively;
-said first portion (41) of said head (14) is arranged facing said first portion (42) of said moulding cavity (13) and said second portion (35) of said head is arranged facing each of said second portions (43) of said moulding cavity (13); two of said transition zones (38, 54) are arranged facing each of said second portions (43) of said mould cavity (13) respectively and can be accommodated in each of said second portions of said mould cavity when one of said first frame (9) and said second frame (10) is moved with respect to the other from its rest position to its bent position.
2. Bending device according to claim 1, wherein the first portion (41) of the head (14) has a dimension in the longitudinal direction greater than the dimension in the longitudinal direction of the first portion (42) of the die cavity (13), the first portion (41) of the head (14) being arranged such that the first portion (41) of the head (14) has two ends arranged respectively facing each of the second portions (43) of the die cavity (13) and receivable in each of the second portions of the die cavity when one of the first frame (9) and the second frame (10) is moved with respect to the other from its rest position to its bending position.
3. Bending device according to claim 1 or 2, wherein each transition (38) comprises two sides (39, 40) meeting at a peak, the two sides (39, 40) each having a flat and inclined surface with respect to the longitudinal direction so as to connect one of the curved sides (36, 37) of the second portion (35) of the head (14) with one of the flat sides (32, 33) of the first portion (41) of the head (14).
4. Bending device according to claim 1 or 2, wherein the first portion (41) of the head (14) has two ends, each end extending in a plane orthogonal to the longitudinal direction.
5. The bending device according to claim 1 or 2, wherein the first portion (41) of the head (14) has two ends, each end extending in a plane transverse to the longitudinal direction and inclined with respect to the longitudinal direction, such that the dimension of the first portion (41) of the head (14) in the longitudinal direction increases towards the peak (25, 34).
6. Bending device according to claim 1 or 2, wherein the punch (11) comprises at least one first element (19) and two different second elements (20a, 20b), the second elements (20a, 20b) being arranged on both sides of the first element (19) in the longitudinal direction, the first element (19) forming at least partially the first portion (41) of the head (14), and the second elements (20a, 20b) each forming one of the second portions (35) of the head (14) and one of the transition zones (38).
7. Bending device according to claim 6, wherein the second elements (20a, 20b) of the punch (11) also each form part of the first portion (41) of the head (14).
8. Bending device according to claim 1 or 2, wherein the punch (11) comprises at least one first element (50) and two different second elements (51), the second elements (51) being arranged on both sides of the first element (50) in the longitudinal direction, the first elements (50) forming the first portion (41) of the head (14) and the second elements (51) each forming one of the second portions (35) of the head (14), the transition zones (54) each being produced at a junction between the first element (50) of the head (14) and one of the second elements (51).
9. Bending device according to claim 1 or 2, wherein the mould (12) comprises at least one first element (21, 52) and two distinct second elements (22a, 22b, 53) arranged on either side of the first element (21, 52) in the longitudinal direction, the first element (21, 52) and the second element (22a, 22b, 53) of the mould (12) forming the first portion (42) and the second portion (43) of the mould cavity (13), respectively.
10. Bending device according to claim 1 or 2, wherein the head (14) comprises n first portions (41) and n +1 second portions (35), where n is an integer, each of the first portions (41) of the head (14) being arranged between two second portions (35) of the head (14) and being connected to the second portions (35) by transition zones (38, 54);
wherein the mold cavity (13) comprises n first portions (42) and n +1 second portions (43), each first portion (41) of the head (14) being arranged to face one of the first portions (42) of the mold cavity (13) and the second portions (35) of the head (14) each being arranged to face one of the second portions (43) of the mold cavity (13), and
wherein each first portion (41) of the head (14) and the two transition zones (38, 54) between two adjacent second portions (35) respectively face each of the second portions (43) of the mould cavity (13) adjacent to the first portion (42) of the mould cavity (13) facing the first portion (41) of the head (14) and are therefore receivable in each of the second portions of the mould cavity when one of the first frame (9) and the second frame (10) is moved relative to the other from its rest position to its bent position.
11. A method for using a bending device according to any one of claims 1 to 10, the method comprising:
-positioning a metal sheet (1) with respect to the mould (12); and
-moving one of said first frame (9) and said second frame (10) with respect to the other from its rest position to its bent position.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1663353 | 2016-12-23 | ||
| FR1663353A FR3061046B1 (en) | 2016-12-23 | 2016-12-23 | FOLDING DEVICE FOR FORMING A CORRUGATION IN A METAL SHEET AND METHOD OF USING THE SAME |
| PCT/FR2017/053606 WO2018115656A1 (en) | 2016-12-23 | 2017-12-15 | Bending machine for forming an undulation in a metal sheet, and method for using said machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110114159A CN110114159A (en) | 2019-08-09 |
| CN110114159B true CN110114159B (en) | 2021-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780080021.0A Active CN110114159B (en) | 2016-12-23 | 2017-12-15 | Bending device for forming corrugations in a metal sheet and method of using said device |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR102371115B1 (en) |
| CN (1) | CN110114159B (en) |
| FR (1) | FR3061046B1 (en) |
| RU (1) | RU2748312C2 (en) |
| WO (1) | WO2018115656A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3043344B1 (en) * | 2015-11-05 | 2017-12-08 | Gaztransport Et Technigaz | FOLDING MACHINE FOR FORMING A CORRUGATION IN A METAL SHEET AND METHOD OF USING SUCH A FOLDING MACHINE |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1534299A (en) * | 1921-12-21 | 1925-04-21 | William M Connery | Corrugation-forming die for metal plates |
| SU845955A1 (en) * | 1979-10-22 | 1981-07-15 | Челябинский Политехнический Институтим. Ленинского Комсомола | Apparatus for bending sheet works |
| SE431519B (en) * | 1980-03-04 | 1984-02-13 | Groko Maskin Ab | SET TO BOOK PROFILED PLATE AND DEVICE FOR IMPLEMENTATION OF THE SET |
| JPS5961527A (en) * | 1982-09-29 | 1984-04-07 | Nippon Kokan Kk <Nkk> | Divert forming device of bottom corrugation membrane |
| JPS60187432A (en) * | 1984-03-07 | 1985-09-24 | Shuichi Amano | Press |
| FR2861060B1 (en) * | 2003-10-16 | 2006-01-06 | Gaz Transport & Technigaz | WATERPROOF STRUCTURE AND TANK PROVIDED WITH SUCH A STRUCTURE |
| JP2006122959A (en) * | 2004-10-29 | 2006-05-18 | Yamazaki Mazak Corp | Method for preparing die for press brake and die |
| RU2299108C1 (en) * | 2005-08-23 | 2007-05-20 | Открытое акционерное общество "Завод им. В.А. Дегтярева" | Die set for bending curvilinear-contour parts |
| KR20090119470A (en) * | 2008-05-16 | 2009-11-19 | 주식회사 화인텍 | Method for forming membrane in a liquefied natural gas strorage tank and device thereof |
| FR2936784B1 (en) | 2008-10-08 | 2010-10-08 | Gaztransp Et Technigaz | REINFORCED CORRUGATED MEMBRANE TANK |
| KR101059997B1 (en) * | 2009-02-11 | 2011-08-29 | 삼성중공업 주식회사 | Metal Membrane Assembly and Manufacturing Method Thereof |
| JP6028671B2 (en) * | 2013-04-24 | 2016-11-16 | トヨタ紡織株式会社 | Metal plate forming method and forming apparatus |
| US9662700B2 (en) | 2013-06-25 | 2017-05-30 | Nissan Motor Co., Ltd. | Device and method for forming thin plate-shaped substrate |
| AT515153B1 (en) * | 2013-12-04 | 2015-08-15 | Trumpf Maschinen Austria Gmbh | bending machine |
| FR3020769B1 (en) | 2014-05-06 | 2017-01-06 | Gaztransport Et Technigaz | FOLDING DEVICE AND METHOD FOR FORMING CORRUGATION IN A METAL SHEET |
| EP3194089B1 (en) * | 2014-09-02 | 2018-06-06 | Gaztransport Et Technigaz | Folding device for simultaneous formation of a plurality of corrugations in a metal sheet and method for use of said device |
-
2016
- 2016-12-23 FR FR1663353A patent/FR3061046B1/en active Active
-
2017
- 2017-12-15 CN CN201780080021.0A patent/CN110114159B/en active Active
- 2017-12-15 KR KR1020187024524A patent/KR102371115B1/en active IP Right Grant
- 2017-12-15 RU RU2019118039A patent/RU2748312C2/en active
- 2017-12-15 WO PCT/FR2017/053606 patent/WO2018115656A1/en active Application Filing
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| FR3061046B1 (en) | 2019-05-24 |
| KR20190100017A (en) | 2019-08-28 |
| RU2748312C2 (en) | 2021-05-21 |
| CN110114159A (en) | 2019-08-09 |
| RU2019118039A (en) | 2021-01-25 |
| WO2018115656A1 (en) | 2018-06-28 |
| KR102371115B1 (en) | 2022-03-07 |
| RU2019118039A3 (en) | 2021-01-25 |
| FR3061046A1 (en) | 2018-06-29 |
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