US20140302341A1 - Hot press molding method, article molded by hot press molding, and mold for hot pressing - Google Patents

Hot press molding method, article molded by hot press molding, and mold for hot pressing Download PDF

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Publication number
US20140302341A1
US20140302341A1 US14/353,624 US201114353624A US2014302341A1 US 20140302341 A1 US20140302341 A1 US 20140302341A1 US 201114353624 A US201114353624 A US 201114353624A US 2014302341 A1 US2014302341 A1 US 2014302341A1
Authority
US
United States
Prior art keywords
mold
press molding
molded
hot press
upper mold
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
US14/353,624
Other languages
English (en)
Inventor
Tetsuji Egawa
Takanobu Suzuki
Hidetoshi Kimura
Hideaki Ikezawa
Kenji Kato
Masaki Furuhashi
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.)
Aisin Takaoka Co Ltd
Toyota Motor Corp
Original Assignee
Aisin Takaoka Co Ltd
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 Aisin Takaoka Co Ltd, Toyota Motor Corp filed Critical Aisin Takaoka Co Ltd
Assigned to AISIN TAKAOKA CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA reassignment AISIN TAKAOKA CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EGAWA, TETSUJI, KIMURA, HIDETOSHI, SUZUKI, TAKANOBU, FURUHASHI, MASAKI, IKEZAWA, HIDEAKI, KATO, KENJI
Publication of US20140302341A1 publication Critical patent/US20140302341A1/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
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • 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
    • 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
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12389—All metal or with adjacent metals having variation in thickness

Definitions

  • the present invention relates to a hot press molding technique.
  • Patent Document 1 hot press molding for cooling material heated to a quenching temperature while press-molding the material in a mold to thereby quench the material is widely used.
  • Patent Document 1 JP 2008-284574 A
  • Metal material such as steel to be hot press-molded expands when heated and contracts when cooled. Because of the contraction of the material in the mold, defects such as biting of a molded article into the mold and dimensional errors of a shape of the molded article may be caused.
  • a hot press molding method for press-molding a heated material and cooling the material while holding the material in a mold, wherein, during press molding of the material, shape changes including a portion that curves with respect to a longitudinal direction of the material are molded at longitudinal opposite end portions of the material and resistance to thermal contraction force of the material in the longitudinal direction during cooling is imparted.
  • the shape changes molded on the material during the press molding are preferably a plurality of minute protrusions provided on surfaces of the longitudinal opposite end portions of the material.
  • the shape changes molded on the material during the press molding are preferably flanges molded on the longitudinal opposite ends of the material.
  • thermoforming a hot press molded article obtained by any one of the above-described hot press molding methods.
  • a mold for hot pressing including an upper mold and a lower mold, for sandwiching a heated material between the upper mold and the lower mold to press-mold the material, and for holding the material in the mold to cool the material, wherein a plurality of protruding portions protruding toward the upper mold or a plurality of recessed portions recessed from the upper mold toward the lower mold are provided at a portion of the lower mold corresponding to a longitudinal end portion of the material, a plurality of recessed portions or a plurality of protruding portions corresponding to the protruding portions or the recessed portions provided to the lower mold are provided to the upper mold, and a plurality of minute protrusions are molded on a surface of the longitudinal end portion of the material by the protruding portions or the recessed portions provided to the lower mold and the recessed portions or the protruding portions provided to the upper mold during press molding with the upper mold and the lower mold.
  • a mold for hot pressing including an upper mold and a lower mold, for sandwiching a heated material between the upper mold and the lower mold to press-mold the material, and for holding the material in the mold to cool the material, wherein a flange bending from the upper mold toward the lower mold or from the lower mold toward the upper mold is molded at a longitudinal end of the material by the upper mold and the lower mold during the press molding.
  • FIG. 1 is a schematic diagram of a hot press machine.
  • FIG. 2 is a perspective view of a hot press molded article.
  • FIG. 3 is a longitudinal sectional view of a mold for hot pressing.
  • FIG. 4 is a longitudinal sectional view of another embodiment of the mold for hot pressing.
  • FIGS. 5( a ) and 5 ( b ) are diagrams showing another embodiment of the hot press molded article.
  • a hot press machine includes a mold 1 for hot pressing.
  • the mold 1 for hot pressing has an upper mold 10 and a lower mold 20 and press-molds a material 2 by sandwiching the material 2 between the upper mold 10 and the lower mold 20 .
  • the upper mold 10 is supported on a moving device and movable in a vertical direction.
  • the lower mold 20 is fixed immovably.
  • the material 2 is metal material such as steel which can be quenched.
  • the material 2 is charged into the mold 1 for hot pressing after heated to a quenching or higher temperature by electric heating or the like.
  • the material 2 is molded into a predetermined product shape (see FIG. 2 ) by press molding with the mold 1 for hot pressing and held for a predetermined time in the mold to thereby be cooled and quenched (hot press-molded).
  • the material 2 is molded from a rectangular shape having one direction in a longitudinal direction into a molded article 3 having a hat-shaped section continuous along the longitudinal direction by the hot press molding.
  • the material 2 is molded into the molded article 3 having the hat-shaped section.
  • protrusions 30 , 30 , . . . are molded on a top face at longitudinal opposite end portions of the molded article 3 .
  • the protrusions 30 are molded by curving molding of portions of the material 2 .
  • the protrusions 30 are shape changes including the curved portion inclined with respect to the longitudinal direction of the material 2 .
  • the plurality of protrusions 30 are molded as minute protrusions protruding upward (or downward) into hemispherical shapes from a flat face of the material 2 .
  • the protrusions 30 , 30 , . . . are molded on the top face of the molded article 3 and sprinkled at predetermined intervals in the longitudinal direction and the short-side direction. Size, shape, and the number of protrusions 30 , 30 , . . . are set so as not to hinder mounting operation, assembly operation, and the like in later steps, for example, i.e., not to impair the function of the molded article 3 as a product.
  • the minute protrusions 30 are protrusions having three-dimensional shapes such as hemispheres, oval hemispheres, cubes, rectangular parallelepiped, and frustums formed in such size as not to impair the function of the molded article 3 as the product and protruding to a front face side or a back face side from the flat face portion (especially, the flat face extending in the longitudinal direction) of the molded article 3 .
  • the number of protrusions 30 to be provided is set so as to be able to impart sufficient resistance to thermal contraction force in the longitudinal direction of the material 2 in view of the shape and the size.
  • protruding lengths of the protrusions 30 from the surface are preferably equal to or shorter than thickness of the material 2 . If the thickness of the material 2 is 1.4 mm, diameters of the protrusions 30 formed into the hemispherical shapes are preferably 3 mm or smaller.
  • recessed portions 11 , 11 , . . . recessed upward are formed on the upper mold 10 and protruding portions 21 , 21 , . . . protruding upward are formed on the lower mold 20 .
  • These recessed portions 11 , 11 , . . . and the protruding portions 21 , 21 , . . . are provided to mold the protrusions 30 , 30 , . . . on the material 2 and have shapes corresponding to the protrusions 30 , 30 , . . . .
  • the respective protrusions 30 are molded by sandwiching portions of longitudinal opposite end portions of the material 2 between the respective recessed portions 11 and the respective protruding portions 21 in the press molding.
  • the hot press molded article 3 is obtained.
  • the protrusions 30 , 30 , . . . are formed by sandwiching the material 2 between the recessed portions 11 , 11 , . . . of the upper mold 10 and the protruding portions 21 , 21 , . . . of the lower mold 20 during the press molding with the mold 1 for hot pressing, i.e., before cooling in the mold proceeds and the material 2 is hot press-molded into the molded article 3 .
  • the material contracts from the longitudinal opposite end portions toward a central portion and an amount of contraction in the longitudinal direction is greater than that in the short-side direction, in general.
  • the protrusions 30 , 30 , . . . are formed on the longitudinal opposite end portions and shapes of the opposite end portions are changed to be inclined with respect to a direction of the flat face of the material 2 , it is possible to impart resistance to contraction force to contraction starting points. Therefore, it is possible to satisfactorily prevent the contraction in the longitudinal direction during cooling to thereby prevent deformation and biting into the mold.
  • the protrusions 30 , 30 , . . . are formed as the minute protrusions, they do not affect the product strength, deformation mode, and the like. In other words, the protrusions 30 , 30 , . . . do not greatly increase cross-sectional moment of the shape of the product and do not serve as points where bending starts. In this manner, the protrusions 30 , 30 , . . . do not impose a large limitation on the shape of the product and it is easy to design the molded article 3 including the protrusions 30 , 30 , . . . .
  • the protrusions 30 , 30 , . . . are preferably close to the longitudinal ends as far as the protrusions 30 , 30 , . . . are formed in positions as not to impair functions of the molded article 3 .
  • the positions as not to impair functions of the molded article 3 are positions where the molded article 3 does not affect the product strength and the deformation mode of the molded article 3 .
  • the protrusions 30 , 30 , . . . are formed in positions closer to the end portions than positions where the hole or the notch is provided.
  • the protrusions 30 , 30 , . . . on the outer sides (on the end portion sides when seen from the central portion) of the shape change as in the embodiment, it is possible to prevent thermal contraction in an area on an inner inside of the protrusions 30 , 30 . . . . Therefore, the protrusions 30 , 30 , . . . do not affect positions or dimensions of the hole and the notch and it is possible to improve processing quality.
  • protrusions 30 , 30 , . . . are molded based on the same technical idea, it is possible to satisfactorily prevent the contraction in the longitudinal direction during cooling to thereby prevent deformation and biting into the mold.
  • protrusions 30 , 30 , . . . have been explained as being protruding from the lower mold 20 toward the upper mold 10 (upward) in the above embodiment, they may protrude from the upper mold 10 toward the lower mold 20 (downward) and their protruding directions are not restricted.
  • the protruding directions of the respective protrusions 30 may be selected according to the function of the molded article 3 . In other words, the upward and downward protruding directions of the protrusions 30 may be mixed.
  • flanges 40 , 40 may be provided to longitudinal opposite ends of the molded article 3 .
  • portions bent with respect to a longitudinal direction (flat face direction) of a material 2 are molded at longitudinal end portions of the material 2 in press molding and resistance to contraction force in the longitudinal direction is imparted.
  • the flanges 40 , 40 are molded by bending the longitudinal opposite ends of the material 2 downward (or upward).
  • the respective flanges 40 are provided to opposite ends of the molded article 3 as inclined faces having angles which are larger than 45° and which are such angles that the flanges 40 can be molded by press molding with respect to the flat face direction of the material 2 .
  • the flanges 40 are preferably molded as the inclined faces having the angles from 60° to 80°.
  • the flanges 40 , 40 may be bent from the upper mold 10 toward the lower mold 20 as shown in FIG. 4 or in an opposite direction from the lower mold 20 toward the upper mold 10 .
  • a longitudinal length of the molded article 3 is kept as a length between the flanges 40 , 40 and resistance to contraction force in the longitudinal direction can be imparted. Therefore, it is possible to prevent the contraction in the longitudinal direction during cooling to thereby prevent deformation and biting into the mold.
  • the longitudinal opposite ends on which the flanges 40 , 40 are molded are trimmed in a later step to be used as an end product or parts of the product shape.
  • shapes with open longitudinal end faces may be employed as well.
  • a shape having a simple hat-shaped section continuous in a longitudinal direction FIG. 5( a )
  • a shape having a substantially hat-shaped section, with a wall face molded as an inclined face, continuous in a longitudinal direction FIG. 5( b )

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US14/353,624 2011-10-28 2011-12-26 Hot press molding method, article molded by hot press molding, and mold for hot pressing Abandoned US20140302341A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2011237498A JP2013094793A (ja) 2011-10-28 2011-10-28 ホットプレス成形方法、及びホットプレス成形による成形品、並びに、ホットプレス用金型
JP2011-237498 2011-10-28
PCT/JP2011/080102 WO2013061480A1 (ja) 2011-10-28 2011-12-26 ホットプレス成形方法、及びホットプレス成形による成形品、並びに、ホットプレス用金型

Publications (1)

Publication Number Publication Date
US20140302341A1 true US20140302341A1 (en) 2014-10-09

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ID=48167341

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Application Number Title Priority Date Filing Date
US14/353,624 Abandoned US20140302341A1 (en) 2011-10-28 2011-12-26 Hot press molding method, article molded by hot press molding, and mold for hot pressing

Country Status (5)

Country Link
US (1) US20140302341A1 (ja)
JP (1) JP2013094793A (ja)
CN (1) CN103889610A (ja)
DE (1) DE112011105771T5 (ja)
WO (1) WO2013061480A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150027601A1 (en) * 2013-07-26 2015-01-29 Voestalpine Metal Forming Gmbh Cooling element with spacer
CN106938534A (zh) * 2017-04-05 2017-07-11 华南理工大学 一种宏观表面微拱形透镜阵列的快速热压成型装置及方法
US20170266711A1 (en) * 2016-03-18 2017-09-21 Hyundai Motor Company Method of trimming ultra high strength hot stamping steel sheet using coining
JP2020124726A (ja) * 2019-02-05 2020-08-20 フタバ産業株式会社 プレス成形品及びプレス加工方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107616577B (zh) * 2017-09-05 2022-12-20 巨一集团有限公司 一片式前脸的鞋靴制作工艺及其使用的压烫装置
JP7214973B2 (ja) * 2018-03-30 2023-01-31 マツダ株式会社 熱間プレス加工方法及び加工装置
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
CN112917537A (zh) * 2021-02-22 2021-06-08 合肥汇通控股股份有限公司 地毯成型切边模具

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JP3389562B2 (ja) * 2000-07-28 2003-03-24 アイシン高丘株式会社 車輌用衝突補強材の製造方法
JP4982723B2 (ja) * 2007-05-16 2012-07-25 ユニプレス株式会社 ダイクエンチプレス装置
JP5151784B2 (ja) * 2008-08-05 2013-02-27 新日鐵住金株式会社 センターピラーアウターパネルの製造方法およびセンターピラーアウターパネル用ブランク
CN201279550Y (zh) * 2008-10-06 2009-07-29 广州普什精密模具有限责任公司 一种生产轿车通道内板的反拉深模具
JP5402562B2 (ja) * 2008-11-21 2014-01-29 新日鐵住金株式会社 熱間プレス成形品、その製造装置および製造方法
JP2010264879A (ja) * 2009-05-14 2010-11-25 Aisin Seiki Co Ltd バンパリインホース
CN101623823A (zh) * 2009-06-22 2010-01-13 胡平 节能型高强度钢板温热成形成套装备自动化生产线
JP2011031273A (ja) * 2009-07-31 2011-02-17 Kobe Steel Ltd アルミニウム合金板ブランクおよび自動車パネルの成形方法
CN201552242U (zh) * 2009-12-23 2010-08-18 张家港金鸿顺机械工业有限公司 汽车压板冷冲压成型模具

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US20170266711A1 (en) * 2016-03-18 2017-09-21 Hyundai Motor Company Method of trimming ultra high strength hot stamping steel sheet using coining
CN106938534A (zh) * 2017-04-05 2017-07-11 华南理工大学 一种宏观表面微拱形透镜阵列的快速热压成型装置及方法
JP2020124726A (ja) * 2019-02-05 2020-08-20 フタバ産業株式会社 プレス成形品及びプレス加工方法
JP7144338B2 (ja) 2019-02-05 2022-09-29 フタバ産業株式会社 プレス加工方法

Also Published As

Publication number Publication date
CN103889610A (zh) 2014-06-25
DE112011105771T5 (de) 2014-07-17
JP2013094793A (ja) 2013-05-20
WO2013061480A1 (ja) 2013-05-02

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Owner name: TOYOTA JIDOSHA KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:EGAWA, TETSUJI;SUZUKI, TAKANOBU;KIMURA, HIDETOSHI;AND OTHERS;SIGNING DATES FROM 20140410 TO 20140414;REEL/FRAME:032738/0457

Owner name: AISIN TAKAOKA CO., LTD., JAPAN

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