公开(公告)号：EP3257690A4

公开(公告)日：2018-03-14

申请号：EP16749034

申请日：2016-01-27

Applicant: JFE STEEL CORP

Inventor： TOKITA YUICHI ,  SHIOZAKI TSUYOSHI ,  TAMAI YOSHIKIYO

IPC: B60G7/00 ,  B21C37/08 ,  B21D22/26 ,  B21D53/88 ,  B23K9/00 ,  B23K9/02 ,  B23K9/235 ,  B23K33/00 ,  B23K101/00 ,  B62D21/00 ,  B62D21/02

CPC classification number: B23K9/028 ,  B21D22/26 ,  B21D53/88 ,  B23K9/00 ,  B23K9/0026 ,  B23K9/02 ,  B23K9/235 ,  B23K33/00 ,  B23K33/008 ,  B23K2201/006 ,  B60G7/00 ,  B62D21/00 ,  B62D21/02

Abstract: A welding structure of a press-formed part according to the present invention is a welding structure of a press formed part made by combining and joining two parts formed by press-forming and each having an opening portion on at least one side of a cross-section, while the opening portions face each other. A step portion 7 is provided by forming a bent projection 5 projecting outwardly on a tip end portion of a side wall portion 3a of a lower side part 3, partially or entirely on a joining surface. A tip end side of the step portion 7 is fitted into the opening portion of an upper side part 9, and the step portion 7 of the lower side part 3 and the tip end of a side wall portion 9a of the upper side part 9 are linearly joined by arc welding.

公开(公告)号：EP3231525A4

公开(公告)日：2017-12-20

申请号：EP15867156

申请日：2015-09-08

Applicant: JFE STEEL CORP ,  TOYOTA MOTOR CO LTD

Inventor： MORINO MASAKI ,  KOBIKI HIDEAKI ,  NAKAGAITO TATSUYA ,  TOKITA YUICHI ,  MINOTE TORU ,  TAMAI YOSHIKIYO

IPC: B21D22/20 ,  B21D22/02 ,  B21D37/16 ,  C25D5/26

CPC classification number: B21D22/20 ,  B21D22/022 ,  B21D22/203 ,  B21D22/208 ,  B21D37/16

Abstract: A method for manufacturing a hot press formed part, includes: preparing a hot press forming object comprising a single-ply portion and a two-ply portion by welding first and second coated steel sheets together in partially overlapping relationship, each of the first and second coated steel sheets having a Zn-Ni coating layer formed on a surface thereof; heating the hot press forming object to a temperature range from an Ac 3 transformation temperature of a base steel sheet of the first coated steel sheet to 1000 °C; press forming the hot press forming object to obtain a formed body, the press forming being started upon temperatures of the single-ply portion and of the two-ply portion being no higher than solidification points of the Zn-Ni coating layers of the first and second coated steel sheets and no lower than an Ar 3 transformation temperature of the base steel sheet of the first coated steel sheet; and quenching the formed body, while squeezing the formed body by a tool of press forming and holding at its press bottom dead center, to thereby obtain a hot press formed part, in which the hot press forming object has a thickness ratio from 1.4 to 5.0.

公开(公告)号：EP2823904A4

公开(公告)日：2015-07-01

申请号：EP13757886

申请日：2013-03-04

Applicant: JFE STEEL CORP

Inventor： TAMAI YOSHIKIYO ,  TOKITA YUICHI ,  MINOTE TORU ,  FUJITA TAKESHI

IPC: B21D22/20 ,  B21D22/21 ,  B21D22/26 ,  C21D9/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/14 ,  C22C38/60

CPC classification number: B21D53/88 ,  B21D22/208 ,  B21D22/21 ,  B62D29/007 ,  C21D1/673 ,  C21D8/0226 ,  C21D9/46 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/007 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/105 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/24 ,  C22C38/28 ,  C22C38/44 ,  C22C38/50 ,  C22C38/60

Abstract: Disclosed is a method for forming a steel sheet having a tensile strength of 440 MPa or more into a press-formed part including a flange portion and other portions by press forming. The method includes: heating the steel sheet to a temperature range of 400 °C to 700 °C; and then press-forming the heated steel sheet by using crash forming to obtain a press-formed part, in such a way that an average temperature difference among a flange portion and other portions of the press-formed part immediately after the formation is kept within 100 °C. In this way, geometric changes such as springback that occur in a panel can be suppressed, the dimensional accuracy of the panel can be enhanced accordingly, and the desired mechanical properties can easily be obtained in the press-formed part.

公开(公告)号：EP2716399A4

公开(公告)日：2015-01-07

申请号：EP12789441

申请日：2012-05-16

Applicant: JFE STEEL CORP ,  H ONE CO LTD

Inventor： TAMAI YOSHIKIYO ,  FUJITA TAKESHI ,  KITANI YASUSHI ,  TAKEBE HIROYUKI

IPC: B23K26/20 ,  B23K9/00 ,  B23K9/16 ,  B23K26/14 ,  B23K26/24 ,  B62D21/00

CPC classification number: B62D27/02 ,  B23K9/028 ,  B23K26/1429 ,  B23K26/244 ,  B23K2201/006 ,  B62D21/00 ,  Y10T403/477

公开(公告)号：EP3064288A4

公开(公告)日：2017-07-05

申请号：EP14858848

申请日：2014-08-11

Applicant: JFE STEEL CORP

Inventor： SHIOZAKI TSUYOSHI ,  TAMAI YOSHIKIYO ,  SHINMIYA TOYOHISA ,  TOBITA SHUNSUKE

IPC: B21D22/26 ,  B21D53/88

CPC classification number: B21D22/02 ,  B21D22/26 ,  B21D47/00 ,  B21D53/88

Abstract: A method of sheet forming according to the present invention includes a first sheet forming process that sheet-forms a metal sheet 11 into a first sheet-formed part 27 having an intermediate shape with a first sheet forming tool 1 and a second sheet forming process that sheet-forms the first sheet-formed part 27 into a second sheet-formed part having a product shape. The first sheet-formed part 27 has a side-wall stretching portion 29 formed on a side wall portion 23 on an outer side including an L-shaped bent portion and a top-portion stretching portion 31 formed on the outside of a top portion 21 of the L-shaped bent portion. A curvature radius of the side-wall stretching portion 29 is larger than the curvature radius of the L-shaped bent portion of a sheet-formed part 19, and the curvature radius of a shoulder portion contiguously formed with the top-portion stretching portion 31 is larger than the curvature radius of a shoulder portion contiguously formed with the outside of the top portion 21 of the L-shaped bent portion of the sheet-formed part 19.

Abstract translation: 根据本发明的片材成形方法包括：第一片材成形过程，其通过第一片材成形工具1和第二片材成形过程将金属片材11片材成形为具有中间形状的第一片材​​成形部分27， 将第一片材成型部件27片材成型为具有产品形状的第二片材成型部件。 第一片材成型部件27具有形成在包括L形弯曲部分的外侧上的侧壁部分23上的侧壁延伸部分29和形成在顶部21的外侧上的顶部延伸部分31 的L形弯曲部分。 侧壁延伸部29的曲率半径大于片形成部19的L形弯曲部的曲率半径，并且与顶部延伸部31连续形成的肩部的曲率半径 大于与片状部件19的L形弯曲部分的顶部21的外侧连续形成的肩部的曲率半径。

公开(公告)号：EP3040133A4

公开(公告)日：2016-08-17

申请号：EP14839784

申请日：2014-07-16

Applicant: JFE STEEL CORP

Inventor： NAKAGAITO TATSUYA ,  TOKITA YUICHI ,  MINOTE TORU ,  TAMAI YOSHIKIYO

IPC: B21D22/20 ,  B21D53/88 ,  C21D1/18 ,  C21D1/673 ,  C21D8/02 ,  C21D9/00 ,  C21D9/46 ,  C22C18/00 ,  C22C38/00 ,  C22C38/60 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/0068 ,  B32B15/013 ,  C21D1/18 ,  C21D1/60 ,  C21D1/673 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0221 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C22C18/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/32 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/405

公开(公告)号：EP2921570A4

公开(公告)日：2015-12-09

申请号：EP13854800

申请日：2013-11-07

Applicant: JFE STEEL CORP ,  HONDA MOTOR CO LTD

Inventor： TAKAGI SHUSAKU ,  OKUDA KANEHARU ,  TAMAI YOSHIKIYO ,  FUJITA TAKESHI ,  OKITSU YOSHITAKA ,  SUGIURA TOMOAKI ,  TAKAKI NAOKI

IPC: C22C38/00 ,  B62D25/20 ,  C21D8/00 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  F16F7/00 ,  F16F7/12

CPC classification number: B62D29/007 ,  B62D21/152 ,  C21D1/25 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0221 ,  C21D8/0247 ,  C21D8/0473 ,  C21D9/0068 ,  C21D9/48 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  F16F7/003

公开(公告)号：EP3228399A4

公开(公告)日：2017-12-27

申请号：EP15866217

申请日：2015-11-04

Applicant: JFE STEEL CORP

Inventor： MINOTE TORU ,  NAKAGAITO TATSUYA ,  TOKITA YUICHI ,  TAMAI YOSHIKIYO

IPC: G01N3/28 ,  G06F17/50

CPC classification number: G06F17/5009 ,  B21D22/022 ,  C21D1/673 ,  G01N3/28 ,  G01N2203/0218 ,  G06F17/5018 ,  G06F17/5086 ,  G06F2217/42

Abstract: A method of evaluating a hot stamped part manufactured by hot stamping a coated steel sheet having a Zn-Ni coating layer on a surface of a base steel sheet includes an analysis model setting step, a forming condition setting step, a forming analysis step, and an evaluation step which are performed using a computer, wherein in the evaluation step, a maximum micro-crack depth in the hot stamped part manufactured under a forming condition set in the forming condition setting step is evaluated using a correlation, obtained beforehand, between an equivalent plastic strain in a surface layer of the hot stamped part and the maximum micro-crack depth in the hot stamped part.

公开(公告)号：EP2954961A4

公开(公告)日：2016-06-08

申请号：EP13874279

申请日：2013-02-08

Applicant: JFE STEEL CORP

Inventor： MINOTE TORU ,  TOKITA YUICHI ,  TAMAI YOSHIKIYO ,  FUJITA TAKESHI

IPC: G06F17/50 ,  B21D22/00 ,  B21D22/02 ,  B21D22/20 ,  G01B21/20 ,  G01L1/00 ,  G01N25/00 ,  G06F17/00

CPC classification number: G01N25/00 ,  B21D22/022 ,  B21D22/208 ,  G01B21/20 ,  G01L1/00 ,  G06F17/5009 ,  G06F17/5086 ,  G06F2217/80

公开(公告)号：EP2832465A4

公开(公告)日：2016-01-20

申请号：EP13768492

申请日：2013-03-04

Applicant: JFE STEEL CORP

Inventor： MINOTE TORU ,  TOKITA YUICHI ,  TAMAI YOSHIKIYO ,  URABE MASAKI ,  FUJITA TAKESHI

IPC: B21D22/00 ,  B21D22/20 ,  B21D53/88 ,  G06F17/50

CPC classification number: G01B5/20 ,  B21D22/208 ,  B21D53/88 ,  G01N19/08 ,  G01N25/72 ,  G06F17/5018 ,  G06F17/5095 ,  G06F2217/41 ,  G06F2217/42 ,  G06F2217/44 ,  G06F2217/46

Abstract: A press-forming analysis method according to the present invention includes a step of analyzing press forming (S1) including setting an initial temperature distribution to a heated press-forming metallic sheet, and acquiring shape information, a temperature distribution, a stress distribution, and a strain distribution before mold release, in which a temperature analysis and a structural analysis are coupled; a step of analyzing springback (S3) including conducting a springback analysis based on the shape information, the temperature distribution, the stress distribution, and the strain distribution acquired at the step of analyzing press forming, and acquiring shape information, a temperature distribution, a stress distribution, and a strain distribution after springback; and a step of analyzing cooling stress (S5) including restraining particular nodes based on the shape information, the temperature distribution, the stress distribution, and the strain distribution acquired at the step of analyzing springback, and analyzing stress distributions during cooling and after the cooling by coupling a temperature analysis and a structural analysis.