EP3570989A1 - Dispositif d'emboutissage par magnéto-formage et procédé associé - Google Patents
Dispositif d'emboutissage par magnéto-formage et procédé associéInfo
- Publication number
- EP3570989A1 EP3570989A1 EP18700764.6A EP18700764A EP3570989A1 EP 3570989 A1 EP3570989 A1 EP 3570989A1 EP 18700764 A EP18700764 A EP 18700764A EP 3570989 A1 EP3570989 A1 EP 3570989A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blank
- punch
- magnetic field
- anvil
- generating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 28
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 238000007747 plating Methods 0.000 claims description 4
- 230000000881 depressing effect Effects 0.000 claims 1
- 238000003825 pressing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 3
- 206010040954 Skin wrinkling Diseases 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004049 embossing Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 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
- 239000003990 capacitor Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009747 swallowing Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/21—Deep-drawing without fixing the border of the blank
Definitions
- the present invention relates to the field of forming, more particularly to stamping.
- the present invention relates to a device and a process for stamping blanks by magnetic pulse for the production of stamped parts, in particular so-called deep-drawn parts.
- stamping is a method very often chosen because robust and well controlled.
- Embossing is commonly used in industry, especially in the automotive industry to form including trim panels, such as a hood or a door of a motor vehicle, because of high production rates eligible.
- Embossing is a forming process consisting in obtaining by plastic deformation of a blank, under the action of a pressure, a piece of more or less complex shape.
- the stamping device for implementing this method is essentially composed of a matrix and a punch of quasi-complementary shape, between which the blank is positioned. Obtaining the shape is done by driving the blank under the action of the punch in the matrix. The movement of the blank is generally controlled by a blank holder, imposing a retaining pressure, in order to reduce the appearance of wrinkles or tears on the final stamped part.
- the hydroforming process In this process, the blanks are shaped by the action of a fluid under pressure.
- the associated hydroforming device consists of a hermetically sealed enclosure formed in two parts, a hollow mold having a cavity complementary to the shape of the part that is desired.
- the blank is placed inside the enclosure. Hydraulic pressure is exerted on the latter to press against the mold cavity.
- the fluid can be pressurized in various ways.
- the electro-hydroforming process known as the EHF process (from the Anglo-Saxon Electro Hydraulic Forming).
- hot forming processes such as the superplastic forming process, known as the SPF (Superplastic Forming Anglo-Saxon) process.
- SPF Superplastic Forming Anglo-Saxon
- This process is based on the ability of certain alloys, for example titanium, to withstand significant deformation.
- These alloys hereafter referred to as superplastic alloys, can reach elongations sometimes going beyond 1000% under certain conditions of temperature, pressure and deformation, whereas conventional alloys generally deform only by about 20%.
- the associated SPF forming device consists of a closed chamber hermetically formed in two parts, including a hollow mold having a footprint complementary to the final external geometry of the part that is desired.
- the blank is placed inside the enclosure and held firmly between the two parts. Pressurized gas is injected in the enclosure and comes to press the blank, by deforming it, against the imprint.
- the pressure and the temperature, of the order of 900 ° C for titanium alloys, must be perfectly controlled.
- the present invention aims in particular to overcome all or part of the limitations of prior art solutions, including those described above, by providing a solution that allows to obtain stamped parts, including deep-drawn parts .
- the invention is aimed primarily at a device for stamping a blank for the production of a stamped part comprising:
- blade is meant a thin plate, in particular of metallic material.
- a plate is said to be thin when one of its dimensions is significantly smaller than the other two, typically at least an order of magnitude.
- the stamping device In an initial position, that is to say before the stamping phase, the stamping device is configured such that:
- the bearing face of the punch is intended to receive part of a first face of the blank
- the anvil and the means for generating a magnetic field are intended to be arranged on either side of another part of the blank.
- the anvil is vis-à-vis the first face, and the means for generating a magnetic field are vis-à-vis a second face, opposite the first face.
- the means for generating a magnetic field are distant from said second face.
- the means for generating a magnetic field are intended to and configured to print on the blank a pressure in the direction of the anvil in a direction ZZ '. This pressure projects the blank, in particular the portion of the blank opposite the anvil, against the anvil. Thus, the pressure exerted comes to partially flatten the blank against the anvil, causing deformation of said blank.
- the stamping device further comprises displacement means arranged to move the punch, relative to the means for generating a magnetic field, in a direction Z'Z, opposite to the direction ZZ '.
- the punch is advantageously moved in translation.
- the punch and the anvil are preferably made of a metallic material to contain the high pressures generated by the means for generating a magnetic field.
- the blank is intended to conform to the shape of the punch to form the final stamped part.
- the stamping device according to the invention differs from conventional stamping devices in that stamping is not performed by the punch itself, but by the means for generating a magnetic field.
- the means for generating a magnetic field are used differently from the conventional frame of a magneto-forming process which forms the entire blank at one time.
- the means for generating a magnetic field are arranged so as to generate magnetic pulses only on a part of the blank. The relative displacement in translation of the punch relative to the generating means makes it possible to move the area of the blank that will be touched by the magnetic pulses.
- Such a device thus advantageously makes it possible to work mainly in compression but also in expansion.
- stamping device is thus particularly suitable for the production of stamped parts, particularly deep-drawn parts, without generating folds or tearing to the workpiece. It is also suitable for producing dropped edges, with the advantages that magnetoforming can bring, such as obtaining radii of curvature less than 2 mm, fine engravings, or tight tolerances, as well as the avoidance of cracking. material in areas of high elongation, especially for aluminum.
- the invention also fulfills the following characteristics, implemented separately or in each of their technically operating combinations.
- the displacement means comprise a linear actuator.
- the means for generating a magnetic field comprises at least one coil.
- the stamping device comprises adjustment means configured to adjust the space between the anvil and the means for generating a magnetic field.
- the stamping device comprises a blank holder configured to impose a retaining pressure on the movement of the blank against the punch.
- the invention also relates to a process for magnetic pulse stamping of a blank for the production of a stamped part, from a stamping device according to one of its embodiments.
- the method comprises the steps of:
- steps b) and c) being repeated, preferably in a synchronized manner, until the desired shape is obtained for the finished stamped part.
- synchronized means that the steps are performed either successively, one after the other, or simultaneously.
- the blank is positioned in the stamping device such that the blank rests solely on the bearing surface of the punch.
- a magnetic pulse is generated by the generating means, exerting, on the one hand, an axial pressure on the blank towards the anvil, coming to press said blank on said anvil, and on the other hand, a radial pressure on the blank towards the punch, coming to press said blank on said punch.
- the axial pressure projects a portion of the blank against the anvil.
- the radial pressure projects another part of the blank against the punch.
- FIG. 1 to 4 are diagrammatic sectional views of an embodiment of a stamping device according to the invention showing the successive steps of stamping a blank
- Figure 5 a schematic view equivalent to Figure 1 illustrating a particular embodiment of the stamping device with a blank holder.
- a stamping device 10, as illustrated in FIGS. 1 to 4, is intended for stamping blanks 50 in order to produce stamped parts, in particular deep-drawn parts.
- the blanks 50 are made of a metallic material, such as steel.
- the blank 50 has a first face 51 and a second face 52, opposite to the first.
- the stamping device 10 is suitable for producing cups.
- bucket is meant a stamped part having a hollow cylindrical shape.
- the drawing device 10 comprises a first frame 20 and a second frame 30.
- the first frame 20 may represent an upper part of the drawing device and the second frame 30, a lower part, as illustrated in the figures.
- the first frame 20 may represent a lower portion, left or right, of the drawing device and the second frame 30, respectively an upper portion, right or left.
- the first frame 20 carries a punch 21, preferably central.
- Said punch comprises a bearing face 21 1 and side walls
- the punch is in the form of a cylindrical body, preferably solid.
- the blank 50 is intended to conform to the shape of an outer surface of the punch 21.
- the punch 21 has, at the level of said outer surface, an imprint corresponding to the shape of the finished part, once stamped.
- the punch 21 is movable in translation, along a vertical axis, by means of displacement 23 able to move the punch between a retracted position and an extended position.
- the displacement means 23 are actuated manually or automatically.
- the displacement means 23 comprise at least one linear, hydraulic or pneumatic actuator, such as a jack operating between the first frame 20 and the punch 21.
- the fixed part of the linear actuator - for example the body of the jack - is housed in a recess (not shown) formed in the first frame 20.
- the moving part of the linear actuator by example the piston of the cylinder, is able to move out of the recess to deploy the punch 21 and able to move to the recess to bring the punch 21 to its original position.
- the movement of the punch 21 is controlled by control means.
- the displacement means 23 are in the form of a support carrying a thrust screw adapted to cooperate with the punch 21 to move it in translation.
- the first frame 20 further comprises an anvil 22.
- Said anvil is arranged around the side walls 212 of the punch 21, when said punch is in its retracted position.
- the anvil and the punch are spaced from each other by a predetermined distance.
- the anvil 22 when the punch 21 is in the form of a cylindrical body, the anvil 22 has a shape in the form of an annular body surrounding the punch. In one embodiment, the anvil 22 can form the first frame 20.
- the punch, at its bearing surface, and the anvil, at a free end 221, are at different heights.
- the second frame 30 comprises a hollow body delimiting an open cavity 33.
- the hollow body is formed of an upper portion 31 and lateral flanks 32.
- the second frame 30 is arranged with respect to the first frame 20 so that:
- the open cavity 33 of the hollow body is intended to receive the punch 21, when it moves vertically in a Z'Z direction, to its deployed position,
- the free ends 321 of the lateral flanks 32 of the hollow body of the second frame are substantially vis-à-vis the free end of the anvil 22.
- the hollow body and the punch 21 have dimensions such that the punch 21 can move freely in the open cavity 33 with, between their respective surfaces, a non-negligible clearance for the passage of the blank 50, in its thickness.
- the open cavity 33 has a shape in the form of an annular body surrounding the punch.
- the outer surface of the punch 21 and the inner wall of the hollow cavity 33 are of substantially complementary shape, the thickness of the final stamped piece and a set of operation.
- the second frame 30 further comprises means for generating a magnetic field 34.
- the means for generating a magnetic field 34 are arranged, at the free ends 321 of the lateral flanks 32 of the hollow body, facing the anvil 22.
- the elements forming the stamping device namely the punch, the anvil and the means for generating a magnetic field 34 are arranged relative to one another so that:
- the punch 21 is positioned so that its bearing surface 21 1, in a retracted or intermediate position, is intended to receive a central part of the first face 51 of the blank 50.
- the blank 50 rests on the bearing surface of the punch.
- the anvil is positioned facing the first face 51 of the blank 50, at a peripheral portion of said blank and the means for generating a magnetic field 34 are positioned opposite the second face 52 of the blank, also at the level of the peripheral portion of said blank.
- the first face 51 of the blank is disposed at a distance from the free end 221 of the anvil 22.
- the means for generating a magnetic field 34 are configured for and intended to create a concentrated magnetic field in a defined space and over a very short period.
- the means for generating a magnetic field 34 are thus suitable and intended to print on the blank 50 a pressure in the direction of the anvil 22, according to a direction ⁇ '.
- the pressure exerted comes to partially flatten the blank against the anvil 22, causing a deformation of said blank.
- the means for generating a magnetic field 34 are a coil.
- the means for generating a magnetic field are preferably part of an assembly which further comprises an electrical energy storage unit and one or more switches (not shown).
- the electrical energy storage unit is configured for and intended to store a moderate energy, for example of the order of a few kilojoules to a few tens of kilojoules (kJ).
- the storage unit is a discharge capacitor bank.
- the first frame 20, the second frame 30, the anvil 22 and the punch 21 are preferably made of a metal material, for example steel, in order to have a structural strength to contain the high pressures generated by the impact of the blank 50 on the anvil 22, during the stamping process which will be described later.
- the drawing device 10 comprises adjusting means (not shown) arranged to move the anvil 22 vertically, in translation.
- Such means make it possible to reduce or increase the space e separating the anvil from the means for generating a magnetic field 34.
- the dimensioning of the space e depends in particular on the material and the geometrical shape of the punch, and than the current pulse. The dimensioning of the space e is maximized so as to reduce the number of discharges and consequently the forming time.
- the adjustment means are a linear, hydraulic or pneumatic actuator.
- the stamping device 10 comprises a blank holder 60.
- the blank holder is housed in the open cavity 33. It is configured to exert a pressure between the blank 50 and the punch 21, when said blank is in position on the punch. The adjustment of this pressure will condition the swallowing of the blank during its shaping.
- the blank holder is held pressed against the second surface 52 of the blank 50 by compression means 61.
- the compression means are a spring or a linear actuator, hydraulic or pneumatic, such as a jack, operating between the blank holder and an inner surface 31 1 of the second frame 30.
- the blank 50 is cut to the desired dimensions (length and width, or diameter, and thickness) in a sheet.
- step a the blank 50 is positioned in the drawing device 10.
- the blank 50 is positioned between the first frame 20 and the second frame 30, as illustrated in FIG.
- the blank 50 is disposed on the one hand at its central portion on the punch 21.
- the blank 50 is arranged so that its first face 51 bears against the bearing face 21 1 of the punch.
- the stamping device comprises a blank holder 60
- the blank 50 is held in abutment against the bearing face 21 1 of the punch 21 by said blank holder.
- the blank 50 is disposed on the other hand, at its peripheral portion, between the means for generating a magnetic field 34 and the anvil 22.
- the first face 51 of the blank is disposed facing the anvil 22, distance from it.
- the second face 52 of the blank is arranged facing the means for generating a magnetic field 34.
- the blank bears on the bearing face 21 1 of the punch 21.
- the blank does not rest on the anvil 22.
- the punch 21 when the blank 50 has been deposited on the punch, the punch 21 is moved, from its retracted position, to translation in the direction Z'Z, to shift the blank 50 so that the second face 52 of said blank, at the peripheral portion of the blank, is placed in the immediate vicinity, for example of the order of a millimeter, means of generating a magnetic field 34.
- the method then comprises a second step, called step b), of deformation of the blank 50 by magneto-forming.
- the ends of the blank 50, located near the means for generating a magnetic field 34, are subjected to a magnetic field coming from the means for generating a magnetic field 34 so that an axial pressure is exerted against the second face 52 of the blank 50, and tightly presses said blank against the anvil 22.
- the arrow illustrated in FIG. 2 represents the axial pressure exerted on the blank 50.
- the blank 50 is deformed accordingly to come to rest against the anvil 22.
- the means for generating a magnetic field 34 progressively deforms the peripheral portion of the blank 50 so as to obtain a first stamp of depth P1, less than a depth P of the stamping final sought.
- the blank 50 is deformed and has a first stamp.
- a third step said step c) the punch 21 is moved.
- the punch 21 is translated by the displacement means 23, in the direction Z'Z, so as to cause the blank 50 to move in its movement, by moving the peripheral portion of the blank 50 away from the anvil 22, as illustrated in FIG. .
- the punch 21 is moved in the Z'Z direction of a sufficient height so that the second face 52 of the blank 50 returns in the immediate vicinity of the magnetic field generating means 34.
- the relative displacement of the punch 21 relative to the means for generating a magnetic field 34 and the anvil 22 is incrementally realized.
- the relative displacement of the punch relative to the means for generating a magnetic field and the anvil is made continuously.
- the shaping of the blank 50 by the means for generating a magnetic field 34 may be regarded as instantaneous with respect to the movement of the punch. Indeed, the duration of the movement of the punch is generally very slow (of the order of one second) with respect to the duration of the magnetic pulse generated by the means for generating a magnetic field 34 (of the order of the micro second).
- the second and third steps are performed simultaneously without modifying the result of said steps.
- steps b) and c) are reproduced sequentially.
- Steps b) and c) are reproduced until the depth P of the final stamped part desired is obtained.
- said means for generating a magnetic field 34 advantageously exert an axial pressure on the blank 50 towards the anvil 22. , plating said blank on said anvil.
- Said means for generating a magnetic field 34 also exert a radial pressure on the blank 50 in the direction of the punch 21, plating said blank on said punch. This radial pressure of the blank 50 against the punch 21 advantageously allows said blank to perfectly fit the shape of the outer surface of the punch 21.
- steps b) and c) depends in particular on the material constituting the blank, the desired depth of the stamped part.
- the present invention is not limited to the preferred embodiments described above as non-limiting examples and variants. mentioned. It also relates to the embodiments within the scope of the skilled person.
- the present invention achieves the objectives it has set for itself.
- it proposes a stamping device adapted to the production of stamped parts, particularly deep-drawn parts, without generating folds or tearing parts.
- Such a stamping device and the associated stamping process makes it possible to work the part mainly in compression but also in expansion.
- the high speeds tend to minimize the appearance of folds, the invention advantageously makes it possible to produce dropped edges.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Printers Characterized By Their Purpose (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1750370A FR3061863B1 (fr) | 2017-01-18 | 2017-01-18 | Dispositif d’emboutissage par magneto-formage et procede associe |
PCT/EP2018/051134 WO2018134271A1 (fr) | 2017-01-18 | 2018-01-17 | Dispositif d'emboutissage par magnéto-formage et procédé associé |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3570989A1 true EP3570989A1 (fr) | 2019-11-27 |
EP3570989B1 EP3570989B1 (fr) | 2021-03-10 |
Family
ID=58162943
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18700764.6A Active EP3570989B1 (fr) | 2017-01-18 | 2018-01-17 | Dispositif d'emboutissage par magnéto-formage et procédé associé |
Country Status (6)
Country | Link |
---|---|
US (1) | US20190374992A1 (fr) |
EP (1) | EP3570989B1 (fr) |
JP (1) | JP2020514066A (fr) |
CN (1) | CN110177632B (fr) |
FR (1) | FR3061863B1 (fr) |
WO (1) | WO2018134271A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3097454B1 (fr) * | 2019-06-18 | 2021-06-18 | Inst De Rech Tech Jules Verne | Dispositif de formage par induction comprenant un inducteur configuré pour déformer par induction une partie d’une pièce électriquement conductrice |
CN111151633B (zh) * | 2020-01-09 | 2021-01-15 | 合肥工业大学 | 一种冲压工艺的分布式电磁控压边系统及其控制方法 |
CN114160640B (zh) * | 2021-11-25 | 2022-08-30 | 华中科技大学 | 一种用于矩形工件的电磁压边装置与方法 |
CN114789551B (zh) * | 2022-06-22 | 2022-09-09 | 天津市奥联特钢结构安装工程有限公司 | 塑钢风道法兰加工装置及加工方法 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61229427A (ja) * | 1985-04-01 | 1986-10-13 | Nichicon Capacitor Ltd | 電磁成形装置 |
JP2505512B2 (ja) * | 1988-01-20 | 1996-06-12 | スカイアルミニウム株式会社 | 電磁力付加プレス加工法 |
JP4199983B2 (ja) * | 2002-10-10 | 2008-12-24 | 株式会社神戸製鋼所 | アルミニウム合金自動車パネルの成形方法 |
WO2005091954A2 (fr) * | 2004-03-08 | 2005-10-06 | Enview Technologies, Llc. | Dispositif electromagnetique de contention de flan |
CN100509198C (zh) * | 2004-06-14 | 2009-07-08 | 株式会社小松制作所 | 模具缓冲控制装置及模具缓冲控制方法 |
JP2006218501A (ja) * | 2005-02-09 | 2006-08-24 | Nippon Steel Corp | 突合せ溶接金属板のプレス成型金型および成型方法 |
DE102007053361A1 (de) * | 2007-11-06 | 2009-05-07 | Volkswagen Ag | Verfahren und Vorrichtung zum elektromagnetischen Umformen von Werkstücken |
KR100940712B1 (ko) * | 2007-12-27 | 2010-02-08 | 주식회사 포스코 | 프레스 장치 및 이를 이용한 프레스 방법 |
CN103191971A (zh) * | 2013-04-01 | 2013-07-10 | 哈尔滨工业大学 | 异种金属复合板材电磁辅助成形装置及其方法 |
CN203459492U (zh) * | 2013-08-05 | 2014-03-05 | 三峡大学 | 径向与轴向双向加载式金属管件电磁成形装置 |
CN103722067B (zh) * | 2013-10-08 | 2015-12-02 | 华中科技大学 | 金属板材的环形电磁脉冲渐进反向拉深成形方法及装置 |
CN103586322A (zh) * | 2013-11-14 | 2014-02-19 | 华中科技大学 | 一种适于高速成形的电磁压边方法 |
CN103861933B (zh) * | 2014-04-01 | 2015-11-25 | 湖南大学 | 一种波纹管成形装置及用该装置加工的波纹管 |
CN103894468A (zh) * | 2014-04-02 | 2014-07-02 | 华中科技大学 | 一种用于金属板材成形的材料流动性控制方法 |
CN104353718B (zh) * | 2014-10-17 | 2016-03-02 | 华中科技大学 | 一种板材包拉成形装置及成形的方法 |
-
2017
- 2017-01-18 FR FR1750370A patent/FR3061863B1/fr not_active Expired - Fee Related
-
2018
- 2018-01-17 JP JP2019538239A patent/JP2020514066A/ja active Pending
- 2018-01-17 CN CN201880007179.XA patent/CN110177632B/zh active Active
- 2018-01-17 US US16/478,661 patent/US20190374992A1/en not_active Abandoned
- 2018-01-17 WO PCT/EP2018/051134 patent/WO2018134271A1/fr unknown
- 2018-01-17 EP EP18700764.6A patent/EP3570989B1/fr active Active
Also Published As
Publication number | Publication date |
---|---|
FR3061863A1 (fr) | 2018-07-20 |
EP3570989B1 (fr) | 2021-03-10 |
US20190374992A1 (en) | 2019-12-12 |
CN110177632B (zh) | 2021-10-08 |
WO2018134271A1 (fr) | 2018-07-26 |
FR3061863B1 (fr) | 2019-05-24 |
CN110177632A (zh) | 2019-08-27 |
JP2020514066A (ja) | 2020-05-21 |
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