US20140130564A1 - Hot-pressing apparatus - Google Patents

Hot-pressing apparatus Download PDF

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Publication number
US20140130564A1
US20140130564A1 US14/129,633 US201114129633A US2014130564A1 US 20140130564 A1 US20140130564 A1 US 20140130564A1 US 201114129633 A US201114129633 A US 201114129633A US 2014130564 A1 US2014130564 A1 US 2014130564A1
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US
United States
Prior art keywords
workpiece
lower die
hot
upper die
forming
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.)
Abandoned
Application number
US14/129,633
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English (en)
Inventor
Takanobu Suzuki
Kenjiro Ishida
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.)
Toyota Motor Corp
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Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHIDA, KENJIRO, SUZUKI, TAKANOBU
Publication of US20140130564A1 publication Critical patent/US20140130564A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a hot-pressing method and a hot-pressing apparatus for pressing and cooling a heated workpiece at the same time.
  • a hot-press forming is widely known in which a pressing machine to which a pair of dies (an upper die and a lower die) are attached presses a workpiece, such as a steel plate, heated to above a temperature at which an austenite structure appears, and at the same time, brings the dies into contact with the workpiece to quench the workpiece.
  • a pressing machine to which a pair of dies (an upper die and a lower die) are attached presses a workpiece, heated to above a temperature at which an austenite structure appears, and at the same time, brings the dies into contact with the workpiece to quench the workpiece.
  • a technique on the hot-press forming is publicly known which enables the dies to suitably cool the workpiece during the quenching by forming water channels through which cooling water flows inside the dies to cool the dies (for example, see Patent Literature 1).
  • Patent Literature 1 JP 2005-7442 A
  • the objective of the present invention is to provide a hot-pressing method and a hot-pressing apparatus capable of quenching a workpiece at a sufficient cooling rate.
  • a first aspect of the invention is a hot-pressing method for pressing and cooling a heated workpiece at the same time, using a lower die having a lower forming surface, and an upper die having an upper forming surface facing the lower forming surface.
  • the hot-pressing method includes a step for pressing the workpiece so as to form a part of the workpiece difficult to come in contact with the lower forming surface of the lower die and the upper forming surface of the upper die positioned at a bottom dead center into a stepped shape.
  • a second aspect of the invention is a hot-pressing apparatus including a lower die having a lower forming surface, and an upper die having an upper forming surface facing the lower forming surface, which causes the lower die and the upper die to press a heated workpiece arranged therebetween, and at the same time, to keep the forming surfaces thereof in contact with a surface of the workpiece to cool the workpiece.
  • at least one of the forming surfaces of the lower die and the upper die is formed as a bumpy surface so that a part of the workpiece difficult to come in contact with the lower forming surface of the lower die and the upper forming surface of the upper die positioned at a bottom dead center is formed in a stepped shape.
  • one of the lower die and the upper die has a protrusion which protrudes from an intermediate part, in a right-left direction, of the forming surface thereof toward the forming surface of the other, and which is continuously formed in a front-rear direction perpendicular to the right-left direction.
  • the other of the lower die and the upper die has a recess which is recessed from an intermediate part, in the right-left direction, of the forming surface thereof in conformity with a shape of the protrusion, and which is continuously formed in the front-rear direction.
  • the forming surface on which the protrusion is formed includes a top surface extending in the right-left direction at a protruding end of the protrusion, two lateral surfaces extending in a direction opposite to that in which the protrusion protrudes from both ends of the top surface in the right-left direction, and two base surfaces extending outward in the right-left direction from extending ends of the lateral surfaces.
  • the top surface is formed as the bumpy surface.
  • the present invention makes it possible to quench a workpiece at a sufficient cooling rate, and to prevent hardness of some parts in the workpiece from being smaller than a predetermined value.
  • FIG. 1 illustrates a hot-pressing apparatus according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing beads.
  • FIG. 3 illustrates the hot-pressing apparatus in which an upper die is at the bottom dead center.
  • FIG. 4 illustrates beads which are formed so that the forming surfaces of dies are recessed.
  • FIG. 5 shows a workpiece being pressed.
  • FIG. 6 is a perspective view showing another embodiment of beads.
  • FIG. 7 is a perspective view showing another embodiment of beads.
  • FIG. 8 illustrates a conventional hot-pressing apparatus.
  • a hot-pressing apparatus 1 as an embodiment of a hot-pressing apparatus according to the present invention.
  • the hot-pressing apparatus 1 performs hot-press forming of a workpiece W.
  • the workpiece W is a steel plate to be worked by the hot-pressing apparatus 1 , and is heated to above a temperature at which an austenite structure appears by ohmic heating and the like.
  • a top-bottom direction in FIG. 1 is defined as a top-bottom direction of the hot-pressing apparatus 1
  • a right-left direction in FIG. 1 is defined as a right-left direction of the hot-pressing apparatus 1
  • this side in FIG. 1 is defined as a front side of the hot-pressing apparatus 1
  • the far side in FIG. 1 is defined as a rear side of the hot-pressing apparatus 1 , thereby a front-rear direction of the hot-pressing apparatus 1 being defined.
  • the hot-pressing apparatus 1 includes a lower die 10 and an upper die 20 whose forming surfaces face each other.
  • the lower die 10 corresponds to the upper die 20 .
  • the lower die 10 is produced by performing numerical control machining of a predetermined ingot.
  • the lower die 10 is configured so that cooling water flows thereinside.
  • the lower die 10 has a protrusion 11 which protrudes upward from the forming surface (the upper surface) thereof.
  • the protrusion 11 protrudes upward from the forming surface of the lower die 10 .
  • the protrusion 11 is continuously formed in the front-rear direction in the intermediate part (the substantially middle part), in the right-left direction, of the forming surface of the lower die 10 .
  • the lower die 10 has a top surface 10 a extending in the right-left direction at the protruding end (uppermost part) of the protrusion 11 , two lateral surfaces 10 b extending in a direction opposite to that in which the protrusion 11 protrudes (in the bottom direction) from both the ends of the top surface 10 a in the right-left direction, and two base surfaces 10 c extending outward in the right-left direction from the extending ends (the bottom ends) of the lateral surfaces 10 b . These surfaces act as what is called a hat-shaped forming surface of the lower die 10 .
  • the top surface 10 a of the lower die 10 is provided with a plurality of beads 12 .
  • the bead 12 protrudes upward from the top surface 10 a .
  • the bead 12 has a shape in which a semicircular section thereof whose arc is situated at the upper part thereof continues in the front-rear direction from the vicinity of the front end to the vicinity of the rear end of the protrusion 11 .
  • the bead 12 has a shape similar to that of one of two equal parts into which a cylinder with an axis parallel to the front-rear direction is divided along the axis, and is arranged so that the flat surface (cutting surface of one of two equal parts into which a cylinder is divided) comes in contact with the top surface 10 a.
  • the plurality of beads 12 (in the present embodiment, three beads 12 ) are arranged at predetermined intervals in the right-left direction.
  • the bead 12 is made of the same metal as the lower die 10 , or a metal with hardness larger than that of the lower die 10 .
  • the bead 12 is formed by, after performing buildup welding on the top surface 10 a , performing numerical control machining so that the buildup part is formed into a predetermined shape, by performing numerical control machining so that the top surface 10 a is formed into a predetermined shape when producing the lower die 10 from a predetermined ingot, or by means of a similar technique.
  • the bead 12 is formed in order to change the top surface 10 a of the lower die 10 into a bumpy surface.
  • the upper die 20 corresponds to the lower die 10 .
  • the upper die 20 is produced by performing numerical control machining of a predetermined ingot.
  • the upper die 20 is configured so that cooling water flows thereinside.
  • the upper die 20 has a recess 21 recessed upward from the forming surface (the lower surface) of the upper die 20 in conformity with the shape of the protrusion 11 .
  • the recess 21 is formed so that the forming surface of the upper die 20 is recessed upward.
  • the recess 21 is continuously formed in the front-rear direction in the intermediate part (the substantially middle part), in the right-left direction, of the forming surface of the upper die 20 .
  • the upper die 20 has a bottom surface 20 a extending in the right-left direction at the innermost part (uppermost part) of the recess 21 , two lateral surfaces 20 b extending in a direction opposite to that in which the recess 21 is recessed (in the bottom direction) from both the ends of the bottom surface 20 a in the right-left direction, and two base surfaces 20 c extending outward in the right-left direction from the extending ends (the bottom ends) of the lateral surfaces 20 b . These surfaces act as what is called a hat-shaped forming surface of the upper die 20 .
  • the hot-pressing apparatus 1 configured as mentioned above causes the lower die 10 and the upper die 20 to press the heated plate-like workpiece W arranged between the forming surfaces thereof to form the workpiece W into what is called a hat shape by moving the upper die 20 to the bottom dead center so that the upper die 20 cones close to the lower die 10 .
  • the hot-pressing apparatus 1 causes the lower die 10 and the upper die 20 to keep the forming surfaces thereof in contact with the surface of the workpiece W to cool the workpiece W. Consequently, the hot-pressing apparatus 1 produces the workpiece W as a product.
  • a hot-pressing step S 1 as an embodiment of a hot-pressing method according to the present invention.
  • the hot-pressing step S 1 is a step in which the hot-pressing apparatus 1 performing the hot-press forming of the workpiece W.
  • the hot-pressing apparatus 1 causes the lower die 10 and the upper die 20 to press the heated plate-like workpiece W arranged between the forming surfaces thereof, and at the same time, brings the lower die 10 and the upper die 20 into contact with the workpiece W to quench the workpiece W.
  • a top part Wt (a part corresponding to the top surface 10 a ) situated in the uppermost part of the pressed workpiece W is formed into a stepped shape along the shapes of the plurality of beads 12 when the workpiece W is pressed in the hot-pressing step S 1 .
  • the plurality of beads 12 act as a means which changes the top surface 10 a into a bumpy surface to form a part of the workpiece W into the stepped shape.
  • the “stepped shape” of the workpiece W is a shape in which the workpiece W is bent to protrude toward the forming surfaces of the lower die 10 and the upper die 20 .
  • the workpiece W is formed into the wavy stepped shape in which two parts protruding toward the forming surface (the top surface 10 a ) of the lower die 10 are formed, and three parts protruding toward the forming surface (the bottom surface 20 a ) of the upper die 20 are formed.
  • the top part Wt of the workpiece W is formed to protrude toward the forming surfaces of the lower die 10 and the upper die 20 , compared with the case where the top part Wt is not formed in the stepped shape, the top part Wt has large contact areas with a part of the forming surface of the lower die 10 where the plurality of beads 12 are not formed, and the forming surface of the upper die 20 when the workpiece W is quenched in the hot-pressing step S 1 .
  • the top part Wt of the workpiece W is formed along the shapes of the plurality of beads 12 formed on the top surface 10 a of the lower die 10 , the top part Wt comes in contact with the plurality of beads 12 forming a part of the forming surface of the lower die 10 along the shapes of the plurality of beads 12 when the workpiece W is quenched in the hot-pressing step S 1 .
  • the top part Wt has large contact area with the forming surface of the lower die 10 .
  • the top surface 10 a of the lower die 10 is provided with the plurality of beads 12 so that the top part Wt of the workpiece W is formed into the stepped shape.
  • the top surface 10 a of the lower die 10 is provided with the plurality of beads 12 so that a part of the workpiece W difficult to come in contact with the forming surfaces of the lower die 10 and the upper die 20 positioned at the bottom dead center is formed into the stepped shape.
  • the “part difficult to come in contact” with the forming surfaces of the lower die 10 and the upper die 20 positioned at the bottom dead center in the workpiece W is a part where an amount of clearance (a distance) between the workpiece W and conventional dies which does not have the plurality of beads 12 is larger than a predetermined value when the workpiece W is quenched, namely, a part where hardness thereof is smaller than a predetermined value (is insufficient) after the hot-press forming.
  • the part is may previously be found by a simulation and the like.
  • the top surface 10 a of the lower die 10 is provided with the plurality of beads 12 , thus enabling to form the top part Wt difficult to come in contact with the forming surfaces of the lower die 10 and the upper die 20 positioned at the bottom dead center into the stepped shape.
  • the top surface 10 a of the lower die 10 is provided with the plurality of beads 12 , but the configurations of the dies are limited thereto as long as the top part Wt is formed into the stepped shape.
  • a plurality of beads similar to the plurality of beads 12 may be provided to the bottom surface 20 a of the upper die 20 in addition to the plurality of beads 12 provided to the top surface 10 a of the lower die 10 , or the plurality of beads similar to the plurality of beads 12 may be provided to only the bottom surface 20 a of the upper die 20 .
  • a plurality of beads 112 and a plurality of beads 122 which do not protrude from the forming surfaces of the dies as the plurality of beads 12 but are recessed from the forming surfaces of the dies may be provided to the lower die 10 and the upper die 20 , respectively.
  • the bead 112 is formed on the top surface 10 a of the lower die 10 so that a semicircular section thereof whose are is situated at the lower part thereof continues in the front-rear direction, and two beads 112 are arranged at a predetermined interval in the right-left direction.
  • the bead 112 is formed in order to change the top surface 10 a of the lower die 10 into a bumpy surface.
  • the bead 122 is formed on the bottom surface 20 a of the upper die 20 so that a semicircular section thereof whose arc is situated at the upper part thereof continues in the front-rear direction, and three beads 122 are arranged at predetermined intervals in the right-left direction.
  • the bead 122 is formed in order to change the bottom surface 20 a of the upper die 20 into a bumpy surface.
  • the bead 112 and the bead 122 are alternately arranged at different positions in the right-left direction.
  • beads such as the bead 112 and the bead 122 may be formed by performing numerical control machining to cut the forming surfaces of the dies.
  • the dies have the shapes to form the top part Wt of the workpiece W into the stepped shape.
  • the dies should be formed in the shapes to form the parts of the workpiece W other than the top part Wt into the stepped shape. For example, a plurality of beads should be formed on the base surfaces 10 c of the lower die 10 .
  • the plurality of beads 12 are formed on the top surface 10 a which is the surface of the lower die 10 situated in the uppermost part thereof.
  • the top surface 10 a which is the surface of the lower die 10 situated in the uppermost part thereof comes in contact with the workpiece W at a relatively early stage when the workpiece W is pressed.
  • the part to be finally formed into the top part Wt is worked at a relatively early stage.
  • the top part Wt of the workpiece W is formed into the stepped shape.
  • the plurality of beads 12 are arranged at such positions that the top part Wt of the workpiece W is formed into the stepped shape when the upper die 20 arrives at the vicinity of the bottom dead center.
  • three beads 12 each of which has the shape similar to that of one of two equal parts into which a cylinder is divided are arranged at predetermined intervals in the right-left direction (see FIG. 2 ), but the configurations of the beads are limited thereto as long as a part of the workpiece W is formed into the stepped shape.
  • two flat beads 212 may be formed at a predetermined interval in the front-rear direction.
  • the bead 212 forms a rectangular shape as seen from above.
  • the bead 212 protrudes upward from the top surface 10 a , and has a flat top surface.
  • the bead 212 is continuously formed from the vicinity of the left end to the vicinity of the right end of the top surface 10 a of the lower die 10 , and is continuously formed from the vicinity of one end to the vicinity of the middle of the top surface 10 a of the lower die 10 in the front-rear direction.
  • the bead 212 is formed in order to change the top surface 10 a of the lower die 10 into a bumpy surface.
  • a plurality of semispherical beads 312 may be formed at predetermined intervals.
  • the bead 312 has a shape similar to that of one of two equal parts into which a sphere is divided, and is arranged so that the flat surface (cutting surface of one of two equal parts into which a sphere is divided) comes in contact with the top surface 10 a .
  • Three beads 312 are arranged at predetermined intervals in the right-left direction, and additionally a plurality of sets of the three beads 312 are arranged at predetermined intervals in the front-rear direction.
  • the bead 312 is formed in order to change the top surface 10 a of the lower die 10 into a bumpy surface.
  • the lower die 10 having the protrusion 11 and the upper die 20 having the recess 21 are used, but a lower die having a recess, and an upper die having a protrusion may be used.
  • the lower die 10 and the upper die 20 have shapes to form the workpiece W into the hat shape, but the shapes of the dies are not limited thereto.
  • the dies may have other shapes.
  • the present invention is applied to a hot-pressing method and a hot-pressing apparatus for pressing and cooling a heated workpiece at the same time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US14/129,633 2011-07-06 2011-07-06 Hot-pressing apparatus Abandoned US20140130564A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/065501 WO2013005318A1 (ja) 2011-07-06 2011-07-06 ホットプレス成形方法、及びホットプレス装置

Publications (1)

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US20140130564A1 true US20140130564A1 (en) 2014-05-15

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US14/129,633 Abandoned US20140130564A1 (en) 2011-07-06 2011-07-06 Hot-pressing apparatus

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US (1) US20140130564A1 (ja)
JP (1) JP5704237B2 (ja)
CN (1) CN103648673A (ja)
DE (1) DE112011105406T5 (ja)
WO (1) WO2013005318A1 (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140069163A1 (en) * 2011-05-16 2014-03-13 Toyota Jidosha Kabushiki Kaisha Hot-pressing die and method for manufacturing the same
US20140096585A1 (en) * 2011-08-17 2014-04-10 Kirchhoff Automotive Deutschland Gmbh Press Hardening Tool
US20150027601A1 (en) * 2013-07-26 2015-01-29 Voestalpine Metal Forming Gmbh Cooling element with spacer
US20160199899A1 (en) * 2012-05-07 2016-07-14 Ford Global Technologies, Llc Forming tools having textured surfaces
US11684963B2 (en) * 2017-10-12 2023-06-27 Nippon Steel Corporation Method and apparatus for producing outer panel having character line
US20230321712A1 (en) * 2021-12-20 2023-10-12 G-Tekt Corporation Hot press forming die

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102028068B1 (ko) * 2014-12-25 2019-10-02 닛폰세이테츠 가부시키가이샤 패널형상 성형품의 제조 방법
JP7127331B2 (ja) * 2018-03-30 2022-08-30 マツダ株式会社 熱間プレス加工方法および加工装置
KR102513574B1 (ko) * 2021-08-26 2023-03-24 현대제철 주식회사 핫 스탬핑용 금형 장치 및 핫 스탬핑 부품의 제조 방법

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6742374B2 (en) * 2001-02-20 2004-06-01 Masashi Ozawa Method for partly reinforcing a workpiece
US8555691B2 (en) * 2003-10-02 2013-10-15 Nippon Steel & Sumitomo Metal Corporation Metal plate material hot press molding apparatus and hot press molding method

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JP4441183B2 (ja) * 2002-01-22 2010-03-31 新日本製鐵株式会社 金属製薄板製品の残留応力低減方法
JP4166019B2 (ja) * 2002-02-07 2008-10-15 トヨタ車体株式会社 プレス加工品の歪み除去方法
JP4325277B2 (ja) * 2003-05-28 2009-09-02 住友金属工業株式会社 熱間成形法と熱間成形部材
JP4968208B2 (ja) * 2008-08-04 2012-07-04 住友金属工業株式会社 金属板の熱間プレス成形方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6742374B2 (en) * 2001-02-20 2004-06-01 Masashi Ozawa Method for partly reinforcing a workpiece
US8555691B2 (en) * 2003-10-02 2013-10-15 Nippon Steel & Sumitomo Metal Corporation Metal plate material hot press molding apparatus and hot press molding method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140069163A1 (en) * 2011-05-16 2014-03-13 Toyota Jidosha Kabushiki Kaisha Hot-pressing die and method for manufacturing the same
US9452460B2 (en) * 2011-05-16 2016-09-27 Toyota Jidosha Kabushiki Kaisha Hot-pressing die and method for manufacturing the same
US20140096585A1 (en) * 2011-08-17 2014-04-10 Kirchhoff Automotive Deutschland Gmbh Press Hardening Tool
US20160199899A1 (en) * 2012-05-07 2016-07-14 Ford Global Technologies, Llc Forming tools having textured surfaces
US9844809B2 (en) * 2012-05-07 2017-12-19 Ford Global Technologies, Llc Forming tools having textured surfaces
US20150027601A1 (en) * 2013-07-26 2015-01-29 Voestalpine Metal Forming Gmbh Cooling element with spacer
US10294536B2 (en) * 2013-07-26 2019-05-21 Voestalpine Metal Forming Gmbh Cooling element with spacer
US11684963B2 (en) * 2017-10-12 2023-06-27 Nippon Steel Corporation Method and apparatus for producing outer panel having character line
US20230321712A1 (en) * 2021-12-20 2023-10-12 G-Tekt Corporation Hot press forming die
US11975379B2 (en) * 2021-12-20 2024-05-07 G-Tekt Corporation Hot press forming die

Also Published As

Publication number Publication date
JP5704237B2 (ja) 2015-04-22
WO2013005318A1 (ja) 2013-01-10
CN103648673A (zh) 2014-03-19
JPWO2013005318A1 (ja) 2015-02-23
DE112011105406T5 (de) 2014-05-15

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