公开(公告)号：US20220245303A1

公开(公告)日：2022-08-04

申请号：US17764464

申请日：2020-05-07

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Takanobu SAITO ,  Tsuyoshi SHIOZAKI

IPC: G06F30/20

Abstract: A vibration noise reduction analysis method for automotive panel parts is executed by a computer and used for reducing vibration noise in a panel part caused by vibrations transmitted from an exciter of an automobile to the panel part through vibration transmission frame parts. The vibration noise reduction analysis method includes: an automotive body mesh model acquisition process; a specific frequency band selection process for a vibration noise reduction target panel part model; a vibration transmission frame part model specification process; an individual mesh sheet thickness optimization process; a divided area setting process for a vibration transmission frame part model; an individual divided-area sheet thickness optimization process; and a divided area/optimal sheet thickness determination process for a vibration transmission frame part.

公开(公告)号：US20210206244A1

公开(公告)日：2021-07-08

申请号：US16754660

申请日：2018-09-13

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Takanobu SAITO ,  Kazuhiko HIGAI ,  Yoshikiyo TAMAI

IPC: B60J5/04 ,  B32B15/08

Abstract: A stiffening structure for an automotive door panel part according to the present invention includes a door outer panel 3 made of a metal sheet curved along a height direction, and in which a character line 3a is formed; and an impact beam 5 disposed at an inner surface side of the door outer panel 3. The stiffening structure improves tensile rigidity of the door outer panel 3 by attaching a stiffening member 7 made of resin to the inner surface of the door outer panel 3. The stiffening member 7 includes vertical bone portions 9 extending in a streak shape from the impact beam 5 to the character line 3a along a curve of the door outer panel 3. The vertical bone portions 9 are arranged at a predetermined interval in a front-rear direction of the door outer panel 3, and outer surface of the vertical bone portions 9 is bonded to the inner surface of the door outer panel 3.

公开(公告)号：US20230237216A1

公开(公告)日：2023-07-27

申请号：US18008936

申请日：2021-04-06

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Takanobu SAITO ,  Tsuyoshi SHIOZAKI

IPC: G06F30/20 ,  G06F30/15

CPC classification number: G06F30/20 ,  G06F30/15 ,  G06F2119/10

Abstract: A vibration and noise reduction analysis device for a panel part of an automobile is configured to reduce vibration and noise of the panel part caused by vibration from a vibration source and a noise source in the automobile and identify a portion at which a weight of an automotive body of the automobile can be reduced. The vibration and noise reduction analysis device includes: an automotive body model acquisition unit; a sectioned region setting unit; a vibration and noise reduction target panel part model setting unit; a vibration mode/equivalent radiation power peak frequency selection unit; a sectioned region weight change peak frequency acquisition unit; a sectioned region weight contribution degree calculation unit; and a vibration and noise reduction and weight reduction portion identification unit.

公开(公告)号：US20170306437A1

公开(公告)日：2017-10-26

申请号：US15521515

申请日：2015-10-05

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Takeshi YOKOTA ,  Kazuhiro SETO

IPC: C21D9/46 ,  B21D22/02 ,  C23C2/12 ,  C23C2/06 ,  C22C38/38 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C22C18/00 ,  C23C2/28 ,  B32B15/01 ,  C21D1/673 ,  C21D8/02 ,  C21D6/00 ,  C23C2/40

CPC classification number: C21D9/46 ,  B21D22/022 ,  B32B15/012 ,  B32B15/013 ,  B32B2255/06 ,  B32B2255/205 ,  C21D1/18 ,  C21D1/673 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D8/0436 ,  C21D9/48 ,  C21D2211/001 ,  C21D2211/008 ,  C22C18/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  Y10T428/12757

Abstract: A high-strength hot-pressed part having a specified chemical composition, a microstructure including, in terms of volume fraction, 80% or more of a martensite phase, in a range of 3.0% to 20.0% of a retained austenite phase, a tensile strength TS of 1500 MPa or more, and a uniform elongation uEl of 6.0% or more. A method for manufacturing the high-strength hot-pressed part, the method comprising performing a heating process and a hot press forming process on a raw material steel sheet in order to obtain a hot-pressed part having a specified shape.

公开(公告)号：US20220350940A1

公开(公告)日：2022-11-03

申请号：US17761025

申请日：2020-05-07

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Takanobu SAITO ,  Tsuyoshi SHIOZAKI

IPC: G06F30/15 ,  B62D25/20 ,  G06F30/20

Abstract: A vibration noise reduction analysis method for automotive panel parts acquires optimal distribution of beads to be provided in an automotive panel part to reduce noise caused by vibration of the panel part. The vibration noise reduction analysis method is executed by a computer, and includes: an automotive body analysis model acquiring step; an analysis condition setting step; a single-bead arranged area setting step; a bead parameter distribution acquiring step; an equivalent radiated power (ERP) reacquisition step; a bead parameter distribution acquisition step on a minimum ERP in bead-arranged area; and an optimal bead distribution determination step. The bead parameter distribution acquiring step includes: a bead parameter selection step; a bead parameter distribution analysis model generation step; and a bead parameter design variable distribution analysis step.

公开(公告)号：US20190093191A1

公开(公告)日：2019-03-28

申请号：US15768894

申请日：2016-10-03

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Shinjiro KANEKO ,  Takeshi YOKOTA ,  Kazuhiro SETO

IPC: C21D8/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D1/18 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

Abstract: A hot pressed member having all of: high strength of 1500 MPa or more in tensile strength TS; high ductility of 6.0% or more in uniform elongation uEl; and excellent heat treatment hardenability of increasing in yield stress YS by 150 MPa or more when subjected to heat treatment (baking finish) is provided. A hot pressed member comprises: a predetermined chemical composition (in particular, low C of 0.090% or more and less than 0.30% and high Mn of 3.5% or more and less than 11.0%); a microstructure including a martensite phase of 70.0% or more in volume fraction and a retained austenite phase of 3.0% or more and 30.0% or less in volume fraction; and a dislocation density of 1.0×1016/m2 or more.

公开(公告)号：US20180305785A1

公开(公告)日：2018-10-25

申请号：US15768905

申请日：2016-10-03

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Shinjiro KANEKO ,  Takeshi YOKOTA ,  Kazuhiro SETO

IPC: C21D9/46 ,  B21D22/20 ,  C21D1/18 ,  B21D22/02 ,  C22C38/60 ,  C22C38/58

CPC classification number: C21D9/46 ,  B21D22/02 ,  B21D22/022 ,  B21D22/20 ,  B21D24/00 ,  B21D53/88 ,  C21D1/18 ,  C21D9/00 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/004 ,  C22C38/58 ,  C22C38/60

Abstract: A hot pressed member comprises: a predetermined chemical composition (in particular, low C of 0.090% or more and less than 0.30% and high Mn of 3.5% or more and less than 11.0%); a first region having: a microstructure including a martensite phase of 80.0% or more in volume fraction and a retained austenite phase of 3.0% or more and 20.0% or less in volume fraction; and a dislocation density of 1.0×1016/m2 or more; and a second region having a microstructure including a ferrite phase of 30.0% or more and 60.0% or less in volume fraction, a retained austenite phase of 10.0% or more and 70.0% or less in volume fraction, and a martensite phase of 30.0% or less in volume fraction.

公开(公告)号：US20200299801A1

公开(公告)日：2020-09-24

申请号：US16894886

申请日：2020-06-08

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Yoshikiyo TAMAI

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C21D6/00 ,  C23C2/06 ,  C23C2/02 ,  C22C38/12 ,  C21D1/26 ,  C22C38/38 ,  C23C2/12 ,  C22C38/60 ,  C22C38/16 ,  C21D8/02 ,  C22C38/14 ,  C23C2/40 ,  C22C38/08 ,  B32B15/01

Abstract: A steel sheet for hot press comprises: a predetermined chemical composition; and a steel microstructure that includes ferrite and cementite and in which Mnθ/Mnα is 1.4 or more, where Mnα is a Mn concentration of the ferrite and Mnθ is a Mn concentration of the cementite.

公开(公告)号：US20190390295A1

公开(公告)日：2019-12-26

申请号：US16482154

申请日：2018-02-05

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Yoshikiyo TAMAI

IPC: C21D9/46 ,  B32B15/01 ,  C21D8/02 ,  C21D6/00 ,  C22C18/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D1/18 ,  B21D22/02

Abstract: A hot pressed part comprises: a predetermined chemical composition; and a steel microstructure that is a gradient microstructure in which, in a thickness direction, a surface layer is a soft layer, an inside is a hard layer, and a layer between the soft layer and the hard layer is a transition layer.

公开(公告)号：US20190249268A1

公开(公告)日：2019-08-15

申请号：US16082094

申请日：2017-01-13

Applicant: JFE STEEL CORPORATION

Inventor： Koichi NAKAGAWA ,  Yoshikiyo TAMAI

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  B32B15/01

CPC classification number: C21D9/46 ,  B32B15/01 ,  C21D1/26 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0268 ,  C21D2211/003 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40

Abstract: A steel sheet for hot press comprises: a predetermined chemical composition; and a steel microstructure that includes ferrite and cementite and in which Mnθ/Mnα is 1.4 or more, where Mnα is a Mn concentration of the ferrite and Mnθ is a Mn concentration of the cementite.