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公开(公告)号：US20250001539A1
公开(公告)日：2025-01-02
申请号：US18709081
申请日：2022-08-18
Applicant: JFE STEEL CORPORATION
Inventor： Naoki YAMAGUCHI , Tsuyoshi SHIOZAKI
Abstract: A press formed part fracture determination method decides a countermeasure for a fracture occurring in a press formed part in which a fracture has occurred or a fracture is predicted to occur by press forming of a metal sheet, and includes: reproducing a stress state in a press forming process of a fracture occurrence portion where a fracture has occurred or a fracture is predicted to occur, in the press formed part, and determining occurrence/non-occurrence of a micro crack in a stress state reproduction portion of the test piece; and determining, when a micro crack has occurred, that there is a fracture occurred in the press formed part in the press forming process, and determining, when there is no micro crack in the stress state reproduction portion of the test piece, that there is a fracture occurred in springback of the press formed part after press forming.
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2.发明公开公开(公告)号：US20230407511A1
公开(公告)日：2023-12-21
申请号：US18029816
申请日：2021-06-16
Applicant: JFE STEEL CORPORATION
Inventor： Kazuhiko HIGAI , Tsuyoshi SHIOZAKI , Yoshikiyo TAMAI
Abstract: A method includes: manufacturing an automotive crashworthiness energy absorbing part; and assembling an automotive body by attaching the manufactured automotive crashworthiness energy absorbing part to the automotive body, wherein the manufacturing the automotive crashworthiness energy absorbing part includes: manufacturing a pre-coated part including a tubular member formed using a hat-shaped section member including a top portion and a side wall portion, and a coating part having quality of material with a strength lower than that of the tubular member, the coating part being disposed with a gap of 0.2 mm to 3 mm on an outer surface of a portion including a corner connecting the top portion and the side wall portion in the tubular member to form a coating film; and forming a coating film by forming a coating layer by electrodeposition coating in at least the gap in the pre-coated part, and thermally curing the coating layer.
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公开(公告)号：US20230219623A1
公开(公告)日：2023-07-13
申请号：US18009583
申请日：2021-03-19
Applicant: JFE STEEL CORPORATION , IIDA INDUSTRY CO., LTD.
Inventor： Kazuhiko HIGAI , Tsuyoshi SHIOZAKI , Yoshikiyo TAMAI , Shigeaki KITAMURA , Naoki MABUCHI
CPC classification number: B62D21/15 , B62D29/004
Abstract: An automotive crashworthiness energy absorptive part absorbs crashworthiness energy by crushing axially when a crashworthiness load is input from a front side or a rear side of an automotive body, and includes: a tubular member formed of a steel sheet with a tensile strength of 590 MPa to 1180 MPa, the tubular member including a top portion and a pair of side wall portions continuous from both ends of the top portion via corner portions; a closed cross section space forming wall member formed of a steel sheet with a tensile strength lower than the tubular member, the closed cross section space forming wall member being disposed on an inner surface side of the tubular member and forming a closed cross section space between the closed cross section space forming wall member and at least the corner portion; and a resin provided in the closed cross section space.
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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.
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公开(公告)号：US20220219631A1
公开(公告)日：2022-07-14
申请号：US17607909
申请日：2019-12-27
Applicant: JFE STEEL CORPORATION
Inventor： Kazuhiko HIGAI , Tsuyoshi SHIOZAKI , Yoshikiyo TAMAI
Abstract: An automotive crashworthiness energy absorption part provided at a front part or a rear part of an automotive body and absorbing crashworthiness energy by undergoing axial crush when receiving input of a crashworthiness load from a front or a rear of the automotive body includes: a tubular member configured to absorb crashworthiness energy by undergoing axial crush, the tubular member including a top portion and side wall portions continuous with the top portion; and resin coated or patched on first outer surfaces including at least outer surfaces of the top portion and the side wall portions of the tubular member. The coated or patched resin has a thickness of 8 mm or less after being heated, forms at least part of a peripheral wall portion of a closed cross section space, and is bonded to the first outer surfaces with an adhesive strength of 10 MPa or more.
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Patent Agency Ranking
公开(公告)号：US20220081038A1
公开(公告)日：2022-03-17
申请号：US17419365
申请日：2019-09-06
Applicant: JFE STEEL CORPORATION
Inventor： Kazuhiko HIGAI , Tsuyoshi SHIOZAKI
Abstract: An automotive frame part is provided to a side portion of an automotive body and absorbs crashworthiness energy by bending upon receiving a crashworthiness load from a side of the automotive body. The automotive frame part includes: a member having a hat-shaped cross section or a U-shaped cross section and including a top portion, and a pair of side wall portions that are continuous from the top portion via punch shoulder R portions; and resin that is coated on or patched to an internal surface of the member having the hat-shaped cross section member or the U-shaped cross section. The resin extends at least to a predetermined range toward the top portion and the side wall portions on both sides of the punch shoulder R portions, and is adhered, after heating, to the internal surface at an adhesive strength of 10 MPa or higher at a room temperature.
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7.发明公开公开(公告)号：US20240320384A1
公开(公告)日：2024-09-26
申请号：US18274533
申请日：2021-11-01
Applicant: JFE STEEL CORPORATION
Inventor： Yuichi TOKITA , Tsuyoshi SHIOZAKI
Abstract: An optimization analysis method for joining positions of an automotive body includes setting the whole or part of an automotive body model as an analysis object model, generating an optimization analysis model by densely setting joining candidate points to the analysis object model, setting a variable loading condition, setting a reciprocal of a predetermined target fatigue life as a target liner cumulative damage, setting improvement of stiffness of the optimization analysis model, reduction of liner cumulative damage that is a reciprocal of fatigue life of joining candidate points, and minimization of the number of joining candidate points, as optimization analysis conditions, and performing optimization analysis by applying the variable loading condition to the optimization analysis model to obtain optimal arrangement of the joining points that achieves the optimization analysis conditions.
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8.发明公开公开(公告)号：US20240092425A1
公开(公告)日：2024-03-21
申请号：US18276146
申请日：2021-10-29
Applicant: JFE STEEL CORPORATION
Inventor： Toshiharu ISHIKAWA , Kazuhiko HIGAI , Tsuyoshi SHIOZAKI
CPC classification number: B62D21/152 , B60R19/34 , B62D29/001
Abstract: A crash energy absorption part for an automobile is provided in a front portion or a rear portion of an automotive body and absorbing crash energy when a crash load is input from a front or a rear of the automotive body, and includes: a top portion; a tubular member including a side wall portion continuous with the top portion via a shoulder part of a punch; and a resin applied or patched to at least an inner surface of the shoulder part of a punch of the tubular member. The resin has a thickness gradually changing in an axial direction from one end side toward other end side, a thickest portion of the thickness is 8 mm or less, and the resin is bonded to the inner surface with an adhesive strength of 10 MPa or more and is axially crushed when the crash load is input.
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公开(公告)号：US20230257899A1
公开(公告)日：2023-08-17
申请号：US18012719
申请日：2021-05-10
Applicant: JFE STEEL CORPORATION
Inventor： Kazuhiko HIGAI , Tsuyoshi SHIOZAKI , Yoshikiyo TAMAI
IPC: C25D13/14
CPC classification number: C25D13/14 , B62D21/152
Abstract: An automotive crashworthiness energy absorption part includes a tubular member formed by using a hat-shaped section part including a top portion and a side-wall portion; a coating part made of a material having a lower strength than the tubular member, the coating part being arranged on outer surfaces of the top portion and the side-wall portion at a portion including a corner portion configured to connect the top portion and the side-wall portion, with a gap of 0.2 mm or more and 3 mm or less from the outer surface of the top portion, the outer surface of the side-wall portion, and an outer surface of the corner portion; and a coating film of an electrodeposition paint formed in the gap.
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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
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.
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