EP2782689B1 - Procédé et outil de formage à chaud et de trempe sous presse de pièces en tôle d'acier, en particulier de pièces en tôle d'acier galvanisée - Google Patents

Procédé et outil de formage à chaud et de trempe sous presse de pièces en tôle d'acier, en particulier de pièces en tôle d'acier galvanisée Download PDF

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Publication number
EP2782689B1
EP2782689B1 EP12778287.8A EP12778287A EP2782689B1 EP 2782689 B1 EP2782689 B1 EP 2782689B1 EP 12778287 A EP12778287 A EP 12778287A EP 2782689 B1 EP2782689 B1 EP 2782689B1
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EP
European Patent Office
Prior art keywords
female mold
edge region
drawing edge
insert part
workpiece
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.)
Active
Application number
EP12778287.8A
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German (de)
English (en)
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EP2782689A1 (fr
Inventor
Janko Banik
Sascha Sikora
Maria KÖYER
Thomas Struppek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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Publication of EP2782689A1 publication Critical patent/EP2782689A1/fr
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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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • 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
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • 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
    • 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
    • B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/22—Martempering

Definitions

  • the invention relates to a method for hot forming and press hardening of plate-shaped or preformed workpieces made of sheet steel, in particular galvanized workpieces made of sheet steel, in which the workpiece is heated to a temperature above the Austenitmaschinestemperatur and then in a cooled forming tool having at least one punch and at least one die , reshaped and quenched. Furthermore, the invention relates to a forming tool for hot forming and press hardening of plate-shaped or preformed workpieces made of sheet steel, in particular galvanized workpieces made of sheet steel, with at least one punch and a die associated with the die, wherein the punch and / or die have cooling channels for passing a cooling fluid.
  • Such a method and such a forming tool are eg in the JP-A-2007075834 disclosed.
  • the present invention has for its object to provide a method or a forming tool of the type mentioned, which improves the flow properties of steel materials during hot forming, so that the risk of occurrence of cracks in the hot forming of workpieces made of sheet steel, especially galvanized steel blanks considerably is reduced.
  • the die used for hot forming and press hardening is coated in its defined by a positive drawing radius Ziehkanten Society with material and / or provided with at least one insert which has a thermal conductivity which is lower by at least 10 W / (m * K) than the thermal conductivity the portion of the die adjacent the drawing edge region which contacts the workpiece during hot working and press hardening of the workpiece.
  • the applied in the drawing edge region material or arranged there insert part, which according to the invention has a relatively low thermal conductivity, is formed so that its surface facing the workpiece has a extending over the drawing edge transverse dimension which is in the range of 1.6 times to 10 times, preferably in the range of 1.6 times to 6 times the positive drawing radius of the die is.
  • the transverse extent (transverse dimension) of the relatively low thermal conductivity having arranged in the drawing edge region material or insert part is thus limited and relatively small.
  • the coated steel sheet (workpiece) to be formed is subjected to high plastic deformation.
  • the workpiece initially experiences a compressive stress, which changes into tensile stress during the continued closing movement of the forming tool.
  • the local flow properties of the workpiece in a conventional forming tool in particular in the drawing radius of the die of a conventional forming tool are adversely affected, which often leads to cracks in the coating, such as zinc coating.
  • different crack depths can form, which can extend into the sheet of the coated component.
  • the material applied in the drawing edge region for example by coating, having a relatively low thermal conductivity or arranged there, a relatively low thermal conductivity insert is such that it is ensured that the component produced by hot forming and press hardening has a substantially completely martensitic structure
  • the part of the press-hardened component influenced by the drawing edge of the die ie the material or insert part having a relatively low thermal conductivity, may have a lower hardness than another part or the remaining part of the component, but this so influenced part of the press-hardened component according to the invention always has a hardness above a required minimum hardness, which corresponds to a martensitic structure. In this way, cracks in the coating, for example in a Zinc layer, as well as in the corresponding coated sheet avoided or significantly reduced at least crack depths in the coating or the coated sheet metal.
  • the hot working of the coating e.g. galvanized workpiece (steel sheet) occurring stresses and strains and the solidification occurring in the forming process are reduced by the reduced heat or temperature loss compared to that in a conventional tempered forming. This also reduces or prevents any local material failure.
  • the present invention thus improves the flow characteristics of steel sheet workpieces during hot forming, and thus significantly reduces the risk of cracking during hot forming of steel sheet workpieces, preferably galvanized steel blanks.
  • the feasibility of components having a complex three-dimensional shape and of coated, e.g. galvanized steel sheet are improved.
  • a preferred embodiment of the solution according to the invention provides that the thermal conductivity of the insertion part or material applied in the drawing edge region is less than 40 W / (m * K), preferably less than 30 W / (m * K), particularly preferably less than 20 W / (m * K) is.
  • the heat or temperature loss during the hot working of the workpiece is advantageously reduced and the forming behavior of the workpiece is improved accordingly.
  • a further advantageous embodiment of the solution according to the invention is characterized in that a heat insulating layer is or is arranged between the insert part and the die.
  • a heat insulating layer is or is arranged between the insert part and the die.
  • this embodiment makes it possible to use an insert which is made of a particularly wear-resistant material, but which has a relatively high thermal conductivity, wherein the heat insulating, which exposed to the Ziehkanten Scheme insert part not exposed to high mechanical stress, in particular no high Reibbe screwung is, from a heat insulating material, for example, plastic or wood material, with low wear resistance can exist.
  • the insert part has a projection protruding from the inner circumference of the die and / or opposite to the edge of the cavity adjacent to the cavity of the die.
  • a further advantageous embodiment of the solution according to the invention is characterized in that the material applied in the drawing edge region of the die is applied to the die by build-up welding, preferably laser-deposition welding.
  • build-up welding preferably laser-deposition welding.
  • the one relatively small Thermal conductivity having material application can be replaced inexpensively by build-up welding, preferably laser deposition welding, if this is required due to a wear-related wear (removal).
  • a further advantageous embodiment of the solution according to the invention is characterized in that the drawing edge region of the die is locally selectively heated by means of a heat source integrated in the matrix or a channel carrying a heating fluid.
  • FIGS. 1 and 2 are each sections of cooled forming tools for hot forming and press hardening of a plate-shaped or preformed workpiece 1 made of sheet steel, in particular a galvanized workpiece made of sheet steel.
  • the reference numeral 2 is a stamp and the reference numeral 3 is a die (die) of the respective forming tool designated.
  • Shaping tool shown optionally have a holding-down device (blank holder), which presses the workpiece 1 against the die 3 during the forming process.
  • the forming tool according to the invention is designed as a blank holder (low-holder) forming tool.
  • Die (die) 3 contains a cavity 4, in which the punch 2 during forming or deep drawing of the workpiece. 1 penetrates.
  • the respective forming tool is shown in each case in the closed state with the workpiece 1 formed therein.
  • cooling channels for passing a cooling fluid are provided near the forming die surface.
  • the workpiece 1 to be formed is first heated to a target temperature, preferably to a temperature above the austenitizing temperature, and then shaped and quenched in the cooled forming tool.
  • the temperature of the heated plate-shaped or preformed workpiece 1 is preferably kept as high as possible prior to the forming in order to achieve an improvement in the flow properties of the workpiece 1 or a reduction of the stresses and / or strains during the forming process. This may be, for example, via the selected level of heating temperature and / or by short transfer times, i. short handling times between the heating device (not shown), such as a continuous furnace, and the start of the forming, are influenced.
  • the forming tool according to the invention is characterized by an optimized heat transfer coefficient.
  • the die 3 is in its defined by a positive drawing radius Ziehkanten Scheme cohesively coated with material and / or there provided with at least one insert part 5, which has a thermal conductivity which is lower by at least 10 W / (m * K) than the thermal conductivity of the drawing edge region adjacent section 3.1 of the die 3, during hot forming and Press hardening of the workpiece with the same comes into contact.
  • the means with comparatively low thermal conductivity are dimensioned such that it is furthermore ensured that a completely martensitic microstructure is established in the formed component (workpiece) 1 after completion of the quenching process (press hardening), whereas the workpiece region influenced by the draw edge region designed according to the invention reduces the Hardness, however, must be within the required minimum hardness, may have, whereby cracks in the workpiece 1 can be avoided or crack depths can be reduced.
  • the workpiece 1 facing surface of the applied in the drawing edge region material 6 (see. Fig. 3 ) or arranged insert 5 therefore has according to the invention a extending over the drawing edge 7 transverse dimension, which is in the range of 1.6 times to 10 times the positive drawing radius of the die 3.
  • the respective die 3 in its positive drawing radius defined pulling edge region at least one insert part 5, whose thermal conductivity is preferably less than 40 W / (m * K), more preferably less than 30 W / (m * K).
  • the at least one insert part 5 is annular or strip-shaped and inserted into a formed in the drawing edge region of the die 3 recess 3.2.
  • FIGS. 3 to 8 Further embodiments of a forming tool according to the invention, preferably a die 3 are shown schematically.
  • a die 3 serving for hot forming and press-hardening is coated, in its drawing edge region defined by a positive drawing radius, with material 6 which has a relatively low thermal conductivity.
  • the material (coating) 6 is preferably ceramic, for example alumina or zirconia.
  • the selective coating of the drawing edge region can be effected, for example, by flame spraying, in particular powder flame spraying or wire flame spraying, or by arc spraying or plasma spraying.
  • the transverse dimension of the coating 6 extending over the drawing edge 7 is, for example, in the range of 1.6 times to 4 times, preferably in the range of 1.6 times to 2 times, the positive drawing radius of the die 3.
  • the coating 6 stands or may protrude slightly from the adjacent surface 3.1 of the die 3, for example by about 0.25 mm to 0.5 mm or even more.
  • the die 3 serving for hot forming and press hardening in the drawing edge region is provided with a material application 6 'produced by build-up welding, which has a relatively low thermal conductivity.
  • a depression 3.3 extending transversely across the drawing edge is produced in the drawing edge region of the die 3, for example by machining.
  • this recess (recess) 3.3 is then by deposition welding material 6 'with arranged relatively low thermal conductivity.
  • This application material 6 ' may be, for example, chromium steel, titanium or high alloy steel, such as X5CrNi18-10, which has a thermal conductivity of about 30 W / (m * K) or less than 30 W / (m * K ) exhibit.
  • the material 6 'applied to the drawing edge region by build-up welding is applied to the extent or subsequently removed by milling or grinding in such a way that it terminates substantially flush in the surface 3.1 of the die 3 or protrudes slightly from the surface 3.1 of the die 3.
  • a strip-shaped insert 5 is arranged with relatively low thermal conductivity in the drawing edge region of the die 3.
  • the insert 5 consists for example of ceramic, preferably of aluminum oxide (Al 2 O 3 ) or zirconium oxide.
  • Al 2 O 3 aluminum oxide
  • zirconium oxide zirconium oxide.
  • a heat source or a heating fluid leading channel 8 is integrated, by means of which the drawing edge region of the die 3 is locally selectively heated.
  • the heat source for example in the form of one or more electrical heating wires, or the channel 8 carrying a heating fluid is integrated in the insertion part 5 forming the drawing edge region.
  • FIG. 6 illustrated embodiment differs from those in the FIGS. 1, 2 and 5 shown embodiments in that between the insert part 5 and the die 3, a heat insulating layer 9 is arranged.
  • the heat insulating layer 9 is single-layered or multi-layered and consists for example of plastic and / or mineral wool.
  • the die 3 used for hot forming and press hardening in the drawing edge region is again provided with a material application 6 'produced by build-up welding, which has a relatively low thermal conductivity.
  • the material application 6 ' is designed so that it has a relation to the inner periphery of the die 3 or opposite to the cavity 4 of the die 3 adjacent edge peripheral surface projecting projection 6.1.
  • a heat source or a heating fluid-conducting channel 8 can again be integrated in the matrix, by means of which the drawing edge region of the die 3 can be locally selectively heated.
  • Fig. 8 illustrated embodiment differs from the embodiment according to Fig. 6 in that the insert part 5 has a projection 5.1 protruding from the inner periphery of the cavity 4 of the die 3 or opposite the edge peripheral surface adjacent to the cavity 4 having.
  • the reference numeral 9 again denotes a disposed between the insert part 5 and the die 3 heat insulating layer.
  • the embodiment of the present invention is not limited to the embodiments described above and / or illustrated in the drawings. On the contrary, numerous variants or modifications are conceivable which make use of the invention specified in the appended claims, even if the design deviates from the exemplary embodiments.
  • the stamp and / or optionally also the sheet holder (hold-down) with means 5, 5.1, 6, 6 ', 6.1 and / or 9 be provided with low thermal conductivity for optimizing the heat transfer coefficient.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Heat Treatment Of Articles (AREA)
  • Extrusion Of Metal (AREA)

Claims (14)

  1. Procédé de formage à chaud et de trempe à la presse de pièces d'usinage (1) en forme de plaques ou préformées, à partir d'une tôle d'acier, en particulier pièces d'usinage (1) galvanisées, à partir d'une tôle d'acier, procédé au cours duquel la pièce d'usinage est chauffée à une température supérieure à la température d'austénitisation et, ensuite, formée et brusquement refroidie dans un outil de formage refroidi qui présente au moins un poinçon (2) et au moins une matrice (3), caractérisé en ce que la matrice (3) utilisée pour le formage à chaud et pour la trempe à la presse est recouverte, dans sa zone d'arêtes à étirer définie par un rayon d'étirage positif, par un matériau (6, 6') appliqué en formant une continuité de matière, et/ou dotée, dans cette zone, au moins d'une pièce rapportée (5) qui présente une conductivité thermique qui est au moins de 10 W/(m * K) inférieure à la conductivité thermique de la partie (3.1) de la matrice (3) voisine de la zone d'arêtes à étirer, laquelle partie, au cours du formage à chaud et au cours de la trempe à la presse de la pièce d'usinage (1), vient au contact de cette même zone, où la surface - tournée vers la pièce d'usinage (1) - du matériau (6 ; 6') appliqué dans la zone d'arêtes à étirer, ou bien la surface de la pièce rapportée (5) disposée dans cette même zone, a une dimension transversale s'étendant sur l'arête à étirer (7), laquelle dimension transversale se situe dans la zone allant de 1,6 fois à 10 fois le rayon d'étirage positif de la matrice (3).
  2. Procédé selon la revendication 1, caractérisé en ce que la conductivité thermique de la pièce rapportée (5) disposée dans la zone d'arêtes à étirer, ou bien la conductivité thermique du matériau appliqué (6, 6'), est inférieure à 40 W/(m * K), de préférence inférieure à 30 W/(m * K).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la pièce rapportée (5) au moins au nombre de un est configurée en forme de baguette et insérée dans un évidement (3.2) configuré dans la zone d'arêtes à étirer de la matrice (3).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'une couche d'isolation thermique (9) est disposée entre la pièce rapportée (5) et la matrice (3).
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la pièce rapportée (5) présente une partie saillante (5.1) dépassant par rapport à la circonférence intérieure de la matrice (3) et/ou par rapport à la surface périphérique de bordure (3.1) contiguë à la cavité (4) de la matrice (3).
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le matériau (6') appliqué dans la zone d'arêtes à étirer de la matrice (3) est appliqué sur la matrice (3) par soudage à recouvrement.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la zone d'arêtes à étirer de la matrice (3) est chauffée localement de manière sélective, au moyen d'une source de chaleur intégrée dans la matrice ou bien au moyen d'un conduit (8) acheminant un fluide chauffant.
  8. Outil de formage servant au formage à chaud et à la trempe à la presse de pièces d'usinage (1) en forme de plaques ou préformées, à partir d'une tôle d'acier, en particulier de pièces d'usinage (1) galvanisées, à partir d'une tôle d'acier, ledit outil de formage comprenant au moins un poinçon (2) et une matrice (3) associée au poinçon, où le poinçon (2) et/ou la matrice (3) présentent des conduits de refroidissement servant à acheminer un fluide de refroidissement, caractérisé en ce que la matrice (3) est recouverte, dans sa zone d'arêtes à étirer définie par un rayon d'étirage positif, par un matériau (6 ; 6') appliqué en formant une continuité de matière, et/ou dotée, dans cette zone, au moins d'une pièce rapportée (5) qui présente une conductivité thermique qui est au moins de 10 W/(m * K) inférieure à la conductivité thermique de la partie (3.1) de la matrice (3) voisine de la zone d'arêtes à étirer, laquelle partie, au cours du formage à chaud et au cours de la trempe à la presse de la pièce d'usinage (1), vient au contact de cette même zone, où la surface - tournée vers la pièce d'usinage (1) - du matériau (6 ; 6') appliqué dans la zone d'arêtes à étirer, ou bien la surface de la pièce rapportée (5) disposée dans cette même zone, a une dimension transversale s'étendant sur l'arête à étirer (7), laquelle dimension transversale se situe dans la zone allant de 1,6 fois à 10 fois le rayon d'étirage positif de la matrice (3).
  9. Outil de formage selon la revendication 8, caractérisé en ce que la conductivité thermique de la pièce rapportée (5) disposée dans la zone d'arêtes à étirer, ou bien la conductivité thermique du matériau appliqué (6, 6'), est inférieure à 40 W/(m * K), de préférence inférieure à 30 W/(m * K).
  10. Outil de formage selon la revendication 8 ou 9, caractérisé en ce que la pièce rapportée (5) au moins au nombre de un est configurée en forme de baguette et insérée dans un évidement (3.2) configuré dans la zone d'arêtes à étirer de la matrice (3).
  11. Outil de formage selon l'une quelconque des revendications 8 à 10, caractérisé en ce qu'une couche d'isolation thermique (9) est disposée entre la pièce rapportée (5) et la matrice (3).
  12. Outil de formage selon l'une quelconque des revendications 8 à 11, caractérisé en ce que la pièce rapportée (5) présente une partie saillante (5.1) dépassant par rapport à la circonférence intérieure de la matrice (3) et/ou par rapport à la surface périphérique de bordure (3.1) contiguë à la cavité (4) de la matrice (3).
  13. Outil de formage selon l'une quelconque des revendications 8 à 12, caractérisé en ce que le matériau (6') appliqué dans la zone d'arêtes à étirer de la matrice (3) est appliqué sur la matrice (3) par soudage à recouvrement.
  14. Outil de formage selon l'une quelconque des revendications 8 à 13, caractérisé en ce qu'une source de chaleur ou un conduit (8) acheminant un fluide chauffant est intégré(e) dans la matrice (3), source au moyen de laquelle / conduit au moyen duquel la zone d'arêtes à étirer de la matrice (3) peut être chauffée localement de manière sélective.
EP12778287.8A 2011-11-23 2012-10-16 Procédé et outil de formage à chaud et de trempe sous presse de pièces en tôle d'acier, en particulier de pièces en tôle d'acier galvanisée Active EP2782689B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011055643A DE102011055643A1 (de) 2011-11-23 2011-11-23 Verfahren und Umformwerkzeug zum Warmumformen und Presshärten von Werkstücken aus Stahlblech, insbesondere verzinkten Werkstücken aus Stahlblech
PCT/EP2012/070445 WO2013075888A1 (fr) 2011-11-23 2012-10-16 Procédé et outil de formage à chaud et de trempe sous presse de pièces en tôle d'acier, en particulier de pièces en tôle d'acier galvanisée

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Publication Number Publication Date
EP2782689A1 EP2782689A1 (fr) 2014-10-01
EP2782689B1 true EP2782689B1 (fr) 2016-02-03

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Country Status (13)

Country Link
US (1) US9770750B2 (fr)
EP (1) EP2782689B1 (fr)
JP (1) JP5886977B2 (fr)
KR (1) KR20140094021A (fr)
CN (1) CN103958087B (fr)
CA (1) CA2856679C (fr)
DE (1) DE102011055643A1 (fr)
ES (1) ES2569351T3 (fr)
HU (1) HUE027539T2 (fr)
MX (1) MX341647B (fr)
PL (1) PL2782689T3 (fr)
RU (1) RU2606359C2 (fr)
WO (1) WO2013075888A1 (fr)

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DE102014200875A1 (de) * 2014-01-20 2015-07-23 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Werkzeug zum Warmumformen von Metallblechen
CA2976626C (fr) * 2015-02-19 2020-01-21 Nippon Steel & Sumitomo Metal Corporation Procede de mise en forme d'une tole et produit mis en forme
CN107530757A (zh) * 2015-04-23 2018-01-02 麦格纳国际公司 用于工具的激光烧结模具表面
CN105234264A (zh) * 2015-09-29 2016-01-13 江苏金源锻造股份有限公司 一种钢板电磁热冲压生产线及其热冲压成型方法
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US20140311205A1 (en) 2014-10-23
PL2782689T3 (pl) 2016-12-30
EP2782689A1 (fr) 2014-10-01
ES2569351T3 (es) 2016-05-10
CN103958087A (zh) 2014-07-30
JP2014533608A (ja) 2014-12-15
HUE027539T2 (en) 2016-11-28
CA2856679A1 (fr) 2013-05-30
RU2014125268A (ru) 2015-12-27
MX2014006178A (es) 2014-06-19
US9770750B2 (en) 2017-09-26
CN103958087B (zh) 2016-03-02
DE102011055643A1 (de) 2013-05-23
WO2013075888A1 (fr) 2013-05-30
RU2606359C2 (ru) 2017-01-10
KR20140094021A (ko) 2014-07-29
MX341647B (es) 2016-08-26
CA2856679C (fr) 2019-10-29

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