US20190374992A1 - Device for stamping by magnetic forming and associated method - Google Patents

Device for stamping by magnetic forming and associated method Download PDF

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Publication number
US20190374992A1
US20190374992A1 US16/478,661 US201816478661A US2019374992A1 US 20190374992 A1 US20190374992 A1 US 20190374992A1 US 201816478661 A US201816478661 A US 201816478661A US 2019374992 A1 US2019374992 A1 US 2019374992A1
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United States
Prior art keywords
blank
punch
stamping
anvil
magnetic field
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Abandoned
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US16/478,661
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English (en)
Inventor
Gilles Avrillaud
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ADM28 SARL
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ADM28 SARL
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Publication date
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Publication of US20190374992A1 publication Critical patent/US20190374992A1/en
Assigned to ADM28 S.ÀR.L reassignment ADM28 S.ÀR.L ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AVRILLAUD, GILLES
Abandoned legal-status Critical Current

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    • 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

  • This present disclosure relates to the field of forming, more particularly to stamping.
  • This present disclosure relates to a device and a method for stamping blanks by magnetic pulse for the production of stamped parts, in particular parts referred to as deep drawn.
  • stamping is a method that is very often chosen, because it is robust and controlled well.
  • Stamping is commonly used in industry, in particular in the automobile industry for forming in particular lining panels, such as a bonnet or a door of a motor vehicle, due to the high production speeds that are possible.
  • Stamping is a process for forming consisting in obtaining via the plastic deformation of a blank, under the action of a pressure, a part with a more or less complex shape.
  • the device for stamping for implementing this method is comprised substantially of a die and of a punch of practically complementary shape, between which the blank is positioned.
  • the obtained of the shape is done by the driving of the blank under the action of the punch in the die.
  • the movement of the blank is generally controlled by a blank-holder, which imposes on it a retaining pressure, with the purpose of decreasing the appearance of folds or of tears on the final stamped part.
  • the blanks are formed by the action of a pressurised fluid.
  • the associated device for hydro forming is comprised of hermetically-sealed chamber formed of two pieces of which one is a hollow mould that has an imprint complementary with the shape of the part that is sought to be obtained.
  • the blank is placed inside the chamber.
  • a hydraulic pressure is exerted on the latter that thrusts it against the imprint of the mould.
  • the fluid can be pressurised in various ways.
  • EHF electro hydraulic forming method
  • SPF superplastic forming
  • the associated device for SPF forming is comprised of a hermitically-sealed chamber formed of two pieces of which one is a hollow mould that has an imprint complementary to the final external geometry of the part that is sought to be obtained.
  • the blank is placed inside the chamber and fixedly maintained between the two pieces.
  • a pressurised gas is injected into the chamber and thrusts the blank, by deforming it, against the imprint.
  • the pressure and the temperature of about 900° C. for titanium alloys, must be perfectly controlled.
  • This present disclosure has in particular for objective to overcome all or a portion of the limitations of the solutions of prior art, in particular those mentioned hereinabove, by proposing a solution that allows for the obtaining of stamped parts, and in particular of deep-drawn parts.
  • the present disclosure aims firstly a device for stamping a blank in order to produce a stamped part comprising:
  • blank means a thin plate, in particular made of metal material.
  • a plate is said to be thin when one of its dimensions is clearly less than the other two, typically at least one magnitude.
  • the device for stamping is configured in such a way that:
  • the bearing surface of the punch is intended for receiving a portion of a first surface of the blank
  • the anvil and the means for generating a magnetic field are intended for being arranged on either side of another portion of the blank.
  • the anvil is facing the first surface, and the means for generating a magnetic field are facing a second surface, opposite the first surface.
  • the means for generating a magnetic field are distant from said second surface.
  • the means for generating a magnetic field are intended and configured to imprint 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 with respect to the anvil, against the anvil.
  • the pressure exerted partially thrusts in part the blank against the anvil, causing a deformation of said blank.
  • the device for stamping further comprises movement means arranged to move the punch, relative to the means for generating a magnetic field, in a direction Z′Z, opposite the direction ZZ′.
  • the punch is advantageously moved in translation.
  • the punch and the anvil are preferably made from a metallic material in order 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 in order to form the final stamped part.
  • the device for stamping according to the present disclosure is differentiated from the conventional devices for stamping in that the stamping is not carried out by the punch itself, but by the means for generating a magnetic field.
  • the means for generating a magnetic field are used differently in the conventional framework of a magnetic forming method that forms the whole of the blank at a single time.
  • the means for generating a magnetic field are arranged in such a way as to not generate magnetic pulses only on a portion of the blank.
  • the relative displacement in translation of the punch in relation to the means for generating make it possible to move the zone of the blank that will be touched by the magnetic pulses.
  • Such a device advantageously makes it possible to work primarily in compression but also in expansion.
  • Such a device for stamping is thus particularly suitable for the production of stamped parts, in particular deep-drawn parts, without generating folds or tears in the part.
  • the present disclosure further responds to the following characteristics, implemented individually or in each of their technically operative combinations.
  • the movement means comprise a linear actuator.
  • the means for generating a magnetic field comprises at least one coil.
  • the device for stamping comprises adjusting means configured to adjust the space between the anvil and the means for generating a magnetic field.
  • the device for stamping comprises a blank-holder configured to impose a retaining pressure on the movement of the blank, against the punch.
  • the present disclosure also relates to a method for stamping by magnetic pulse a blank in order to produce a stamped part, using a device for stamping in accordance with one of its embodiments.
  • the method comprises the steps of:
  • synchronised means that the steps are carried out either successively, one after the other, or simultaneously.
  • the blank is positioned in the device for stamping in such a way that the blank rests solely on the bearing surface of the punch.
  • a magnetic pulse is generated by the means for generating, exerting, on the one hand, an axial pressure on the blank in the direction of the anvil, thrusting said blank on said anvil, and on the other hand, a radial pressure on the blank in the direction of the punch, thrusting said blank on said punch.
  • the axial pressure projects a portion of the blank against the anvil.
  • the radial pressure projects another portion of the blank against the punch.
  • This double pressure, axial and radial advantageously allows for both the deformation of the blank and thrusting of it against the punch, making it match the shape of the latter.
  • FIGS. 1 to 4 illustrate schematic cross-section views of an aspect of a device for stamping according to the present disclosure showing the successive steps of stamping of a blank
  • FIG. 5 is a schematic view equivalent to FIG. 1 showing a particular embodiment of the device for stamping with a blank-holder.
  • a device for stamping 10 such as shown in FIGS. 1 to 4 , is intended for the stamping of blanks 50 , for the purpose of producing 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 surface 51 and a second surface 52 , opposite the first.
  • the device for stamping 10 is adapted to the production of cups.
  • cup means a stamped part having a hollow cylindrical shape.
  • the device for stamping 10 comprises a first frame 20 and a second frame 30 .
  • the first frame 20 can represent an upper portion of the device for stamping and the second frame 30 , a lower portion, such as shown in figures.
  • the first frame 20 can represent a lower portion, left or right, of the device for stamping 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 surface 211 and lateral walls 212 .
  • the punch has the form of a cylindrical body, preferably full.
  • the blank 50 is intended to conform to the shape of an outer surface of the punch 21 .
  • the punch 21 has, on said outer surface, an imprint that corresponds to the shape of the final part, once stamped.
  • the punch 21 is mobile in translation, according to a vertical axis, thanks to movement means 23 that can move the punch between a retracted position and a deployed position.
  • the punch 21 is shown in deployed position.
  • the movement means 23 are actuated manually or automatically.
  • the movement means 23 comprise at least one linear, hydraulic or pneumatic, actuator, such as a cylinder operating between the first frame 20 and the punch 21 .
  • the fixed portion of the linear actuator for example the body of the cylinder—is housed in a recess (not shown) made in the first frame 20 .
  • the mobile portion of the linear actuator for example the piston of the cylinder, is able to be moved out of the recess in order to deploy the punch 21 and able to be moved to the recess in order to return the punch 21 to its initial position.
  • the movement of the punch 21 is controlled by control means.
  • the movement means 23 have the form of a support carrying a pressure screw able to cooperate with the punch 21 in order to move it in translation.
  • the first frame 20 further comprises an anvil 22 .
  • Said anvil is arranged around lateral walls 212 of the punch 21 , when said punch is in its retracted position.
  • the anvil and the punch are spaced apart from one another by a predetermined distance.
  • the anvil 22 when the punch 21 has the form of a cylindrical body, has the form of an annular body surrounding the punch.
  • the anvil 22 can form the first frame 20 .
  • the punch, on its bearing surface, and the anvil, on a free end 221 are at separate heights.
  • the second frame 30 comprises a hollow body that delimits an open cavity 33 .
  • the hollow body is formed from an upper portion 31 and of lateral sides 32 .
  • the second frame 30 is arranged with respect to the first frame 20 in such a way that:
  • the free ends 321 of the lateral sides 32 of the hollow body of the second frame are substantially facing the free end of the anvil 22 .
  • the hollow body and the punch 21 have dimensions such that the punch 21 can be moved freely in the open cavity 33 with, between their respective surfaces, a non-negligible space for the passing of the blank 50 , in its thickness.
  • the open cavity 33 has 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 practically the same shape, to the nearest thickness of the final stamped part and an operating clearance.
  • the second frame 30 further comprises means for generating a magnetic field 34 .
  • the means for generating a magnetic field 34 are arranged, on free ends 321 of the lateral sides 32 of the hollow body, facing the anvil 22 .
  • the elements that form the device for stamping namely the punch, the anvil and the means for generating a magnetic field 34 are arranged with respect to one another in such a way that:
  • the punch 21 is positioned in such a way that its bearing surface 211 , in a retracted or intermediate position, is intended to receive a central portion of the first surface 51 of the blank 50 .
  • the blank 50 rests on the bearing surface of the punch.
  • the anvil is positioned facing the first surface 51 of the blank 50 , on a peripheral part of said blank and the means for generating a magnetic field 34 are positioned facing the second surface 52 of the blank, also on the peripheral portion of said blank.
  • the first surface 51 of the blank is arranged 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 magnetic field concentrated in a delimited space and over a very short period.
  • the means for generating a magnetic field 34 are thus able and intended to imprint on the blank 50 a pressure in the direction of the anvil 22 , in a direction ZZ′.
  • the pressure exerted partially thrusts 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 more preferably an integral part of a set that further comprises an electrical energy storage unit and one or several switches (not shown).
  • the electrical energy storage unit is configured for and intended to store a moderate energy, for example of about a few kilojoules to a few tens of kilojoules (kJ).
  • the storage unit is a discharge capacitor battery.
  • the first frame 20 , the second frame 30 , the anvil 22 and the punch 21 are preferably made from a metallic metal, for example steel, so as to have a structural resistance that makes it possible to contain the high pressures generated by the impact of the blank 50 on the anvil 22 , during the method for stamping which shall be described hereinafter.
  • the device for stamping 10 comprises adjusting means (not shown) arranged to move the anvil 22 vertically, in translation.
  • Such means make it possible to reduce or to increase the space e that separates the anvil from the means for generating a magnetic field 34 .
  • the sizing of the space e is according in particular to the material and the geometric shape of the punch, as well as the pulse of the current. The sizing of the space e is maximised in order to reduce the number of discharges and consequently the forming time.
  • the adjusting means are a linear, hydraulic or pneumatic actuator.
  • the device for stamping 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 adjusting of this pressure will condition the feeding of the blank during the forming thereof.
  • the blank-holder is maintained thrust against the second surface 52 of the blank 50 by means of compression 61 .
  • the means of compression are a spring or a linear, hydraulic or pneumatic actuator, such as a cylinder, operating between the blank-holder and an inner surface 311 of the second frame 30 .
  • the blank 50 is cut, to the desired dimensions (length and width, or diameter, and thickness), in a sheet metal.
  • step a the blank 50 is positioned in the device for stamping 10 .
  • the blank 50 is positioned between the first frame 20 and the second frame 30 , as shown in FIG. 1 .
  • the blank 50 is arranged on the one hand on its central portion on the punch 21 .
  • the blank 50 is arranged in such a way that its first surface 51 bears against the bearing surface 211 of the punch.
  • the device for stamping comprises a blank-holder 60
  • the blank 50 is maintained bearing against the bearing surface 211 of the punch 21 by said blank-holder.
  • the blank 50 is arranged on the other hand, on its peripheral portion, between the means for generating a magnetic field 34 and the anvil 22 .
  • the first surface 51 of the blank is arranged facing the anvil 22 , at a distance from the latter.
  • the second face 52 of the blank is arranged facing the means for generating a magnetic field 34 .
  • the blank bears against the bearing surface 211 of the punch 21 .
  • the blank does not bear against the anvil 22 .
  • the punch 21 when the blank 50 has been placed on the punch, the punch 21 is moved, from its retracted position, in translation along the direction Z′Z, in order to offset the blank 50 in such a way that the second surface 52 of said blank, on the peripheral portion of the blank, is placed in immediate proximity, for example of about a millimetre, from the means for generating a magnetic field 34 .
  • the method then comprises a second step, referred to as step b), of deforming the blank 50 via magnetic forming.
  • the ends of the blank 50 located in the vicinity of the means for generating a magnetic field 34 , are subjected to a magnetic field coming from the means for generating a magnetic field 34 in such a way that a pressure, axial, is exerted against the second surface 52 of the blank 50 , and tightly thrusts said blank against the anvil 22 .
  • the arrow shown in FIG. 2 shows the axial pressure exerted on the blank 50 .
  • the blank 50 is consequently deformed to bear against the anvil 22 .
  • the means for generating a magnetic field 34 progressively deforms the peripheral portion of the blank 50 so as to obtained a first stamp with a depth P 1 , less than a depth P of the final stamp sought.
  • the blank 50 is deformed and has a first stamp.
  • step c the punch 21 is moved.
  • the punch 21 is translated by the movement means 23 , in the direction Z′Z, in such a way as to drive in its movement the blank 50 , by moving away the peripheral portion of the blank 50 from the anvil 22 , as shown in FIG. 3 .
  • the movement of the punch 21 , and consequently that of the blank 50 , is carried out in the direction opposite the direction of the movement of the blank 50 during the step b).
  • the punch 21 is moved in the direction Z′Z by a height that is sufficient for the second surface 52 of the blank 50 to return to the immediate vicinity of the means for generating a magnetic field 34 .
  • the relative movement of the punch 21 with respect to the means for generating a magnetic field 34 and to the anvil 22 is carried out incrementally.
  • the relative movement of the punch with respect to the means for generating a magnetic field and to the anvil is carried out continuously.
  • the forming of the blank 50 by the means for generating a magnetic field 34 can be considered as instantaneous with respect to the movement of the punch.
  • the duration of the movement of the punch is generally very slow (of about one second) with respect to the duration of the magnetic pulse generated by the means for generating a magnetic field 34 (of about one microsecond).
  • the second and third steps are carried out simultaneously without modifying the result of said steps.
  • a fourth step the steps b) and c) are reproduced sequentially.
  • said means for generating a magnetic field 34 advantageously exert an axial pressure on the blank 50 in the direction of the anvil 22 , thrusting 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 , thrusting said blank on said punch. This radial pressure of the blank 50 against the punch 21 advantageously allows said blank to perfectly match the shape of the outer surface of the punch 21 .
  • the number of iterations of the steps b) and c) depends in particular on the material comprising the blank, on the desired depth of the stamped part.
  • this present disclosure achieves the objectives that were set for it.
  • it proposes a device for stamping suitable for the production of stamped parts, in particular of deep-drawn parts, without generating folds or tears on the part.
  • Such a device for stamping and of the associated method for stamping can make it possible to work on the part mainly in compression but also in expansion.
  • the present disclosure advantageously makes it possible to produce turned out edges.

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  • 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)
US16/478,661 2017-01-18 2018-01-17 Device for stamping by magnetic forming and associated method Abandoned US20190374992A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1750370 2017-01-18
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

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US20190374992A1 true US20190374992A1 (en) 2019-12-12

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US16/478,661 Abandoned US20190374992A1 (en) 2017-01-18 2018-01-17 Device for stamping by magnetic forming and associated method

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US (1) US20190374992A1 (zh)
EP (1) EP3570989B1 (zh)
JP (1) JP2020514066A (zh)
CN (1) CN110177632B (zh)
FR (1) FR3061863B1 (zh)
WO (1) WO2018134271A1 (zh)

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CN114160640A (zh) * 2021-11-25 2022-03-11 华中科技大学 一种用于矩形工件的电磁压边装置与方法
CN114789551A (zh) * 2022-06-22 2022-07-26 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
RU215915U1 (ru) * 2022-08-22 2023-01-09 Федеральное государственное бюджетное образовательное учреждение высшего образования "Тульский государственный университет" (ТулГУ) Устройство для магнитно-импульсной штамповки

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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

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Publication number Priority date Publication date Assignee Title
CN114160640A (zh) * 2021-11-25 2022-03-11 华中科技大学 一种用于矩形工件的电磁压边装置与方法
CN114789551A (zh) * 2022-06-22 2022-07-26 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
RU215915U1 (ru) * 2022-08-22 2023-01-09 Федеральное государственное бюджетное образовательное учреждение высшего образования "Тульский государственный университет" (ТулГУ) Устройство для магнитно-импульсной штамповки
RU215914U1 (ru) * 2022-08-22 2023-01-09 Федеральное государственное бюджетное образовательное учреждение высшего образования "Тульский государственный университет" (ТулГУ) Устройство для магнитно-импульсной штамповки

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Publication number Publication date
CN110177632A (zh) 2019-08-27
CN110177632B (zh) 2021-10-08
WO2018134271A1 (fr) 2018-07-26
JP2020514066A (ja) 2020-05-21
FR3061863A1 (fr) 2018-07-20
FR3061863B1 (fr) 2019-05-24
EP3570989A1 (fr) 2019-11-27
EP3570989B1 (fr) 2021-03-10

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