公开(公告)号：US20230063824A1

公开(公告)日：2023-03-02

申请号：US17795492

申请日：2021-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Naruhiko NOMURA ,  Toshiya SUZUKI ,  Kenta UENISHI ,  Tohru YOSHIDA

IPC: B21D37/16 ,  B21D22/02

Abstract: A die includes a die body and a removable shell. The die body includes a supply flow channel formed inside the die body. One end of the supply flow channel opens at the surface of the die body. The supply flow channel is to be supplied with a fluid for temperature adjustment. The removable shell is mounted removably to the surface of the die body. The removable shell includes an outer surface that constitutes at least a part of the forming surface of the die. A temperature adjustment space is provided in the surface of the die body or in the removable shell. The temperature adjustment space is in communication with the supply flow channel. The removable shell is divided into a plurality of shell pieces. The plurality of shell pieces are arranged in a direction intersecting the longitudinal direction of the die on the surface of the die body.

公开(公告)号：US20220152685A1

公开(公告)日：2022-05-19

申请号：US17602782

申请日：2020-05-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Naruhiko NOMURA ,  Toshiya SUZUKI ,  Kenta UENISHI

IPC: B21D43/10 ,  B21D43/08 ,  B21D43/02 ,  B21D28/02 ,  B21D22/20 ,  B21D37/16

Abstract: A workpiece transport unit including a pair of arms, an opening/closing mechanism configured to open and close the pair of arms in a horizontal direction, a pair of first placement surfaces provided at the pair of arms and configured for a first workpiece to be placed thereon, and a pair of second placement surfaces provided at the pair of arms and configured for a second workpiece to be placed thereon.

公开(公告)号：US20240044012A1

公开(公告)日：2024-02-08

申请号：US18277550

申请日：2021-04-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuki SUZUKI ,  Kenta UENISHI ,  Soshi FUJITA ,  Masahiro FUDA

IPC: C23C28/04 ,  C22C38/54 ,  C22C38/50 ,  C22C38/38 ,  C22C38/28 ,  C22C38/24 ,  C22C38/32 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C23C28/042 ,  C22C38/54 ,  C22C38/50 ,  C22C38/38 ,  C22C38/28 ,  C22C38/24 ,  C22C38/32 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/002 ,  C22C38/005 ,  C22C38/001

Abstract: To provide a steel sheet for hot stamping suitable for manufacturing, through hot-stamping working, a component having portions with different strengths, and a hot-stamped member having portions with different strengths. A steel sheet for hot stamping according to the present invention includes, on a surface of the steel sheet: a site having a surface-treated film whose emissivity at a wavelength of 8.0 μm at 25° C. is 60% or more; and a site at which the surface-treated film is not provided, in which the surface-treated film contains carbon black, and one or more of oxides selected from a group consisting of a Zr oxide, a Zn oxide, and a Ti oxide, in which the carbon black and the oxides exist while being dispersed over the entire surface-treated film, the surface-treated film has a silica content of 0 to 0.3 g/m2, and when an adhesion amount of the carbon black and an adhesion amount of the oxides are set to XCB (g/m2) and XOxide (g/m2), respectively, an equation (1) below is satisfied.

公开(公告)号：US20240150901A1

公开(公告)日：2024-05-09

申请号：US18280553

申请日：2021-04-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuki SUZUKI ,  Kenta UENISHI ,  Soshi FUJITA ,  Masahiro FUDA

IPC: C23C28/00

CPC classification number: C23C28/3455

Abstract: To provide a steel sheet for hot stamping that further improves productivity of a hot-stamped member, has excellent appearance, and has excellent spot weldability, and a hot-stamped member. A steel sheet for hot stamping according to the present invention includes, on the whole of at least one surface of the steel sheet, a surface-treated film whose emissivity at a wavelength of 8.0 μm at 25° C. is 60% or more, in which the surface-treated film contains carbon black, and one or more of oxides selected from a group consisting of a Zr oxide, a Zn oxide, and a Ti oxide, in which the carbon black and the oxides exist while being dispersed over the entire surface-treated film, the surface-treated film has a silica content of 0 to 0.3 g/m2, and when an adhesion amount of the carbon black and an adhesion amount of the oxides are set to XCB (g/m2) and XOxide (g/m2), respectively, an equation (1) is satisfied.

公开(公告)号：US20230158560A1

公开(公告)日：2023-05-25

申请号：US17916090

申请日：2021-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenta UENISHI ,  Toshiya SUZUKI

IPC: B21D22/20 ,  B21D24/00 ,  B21D37/10 ,  B21D43/05

CPC classification number: B21D22/208 ,  B21D24/005 ,  B21D37/10 ,  B21D43/05

Abstract: A hot press line (100) includes: a heating device (30); a first press device (10) having first die parts (1A, 1B); a second press device (20) having second die parts (2A, 2B); a first transportation device (41) that transports a metal sheet (B) to the first press device; and a second transportation device (42) that transports the metal sheet (B) to the second press device. One of the pair of first die parts and the pair of second die parts includes a clearance portion (1Ac) recessed inwardly, whereas the other pair of die parts includes an abutment surface (2At) in at least part of the portion corresponding to the clearance portion (1Ac) of the one pair of die parts, where the abutment surface abuts the metal sheet (B) when the die is at the bottom-dead center.

公开(公告)号：US20230150006A1

公开(公告)日：2023-05-18

申请号：US17795390

申请日：2021-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Naruhiko NOMURA ,  Toshiya SUZUKI ,  Kenta UENISHI ,  Tohru YOSHIDA

IPC: B21D37/10 ,  B21D37/16

CPC classification number: B21D37/10 ,  B21D37/16

Abstract: The die includes a die base, a die body, and an opening/closing member. In the die base, a storage portion for storing refrigerant is formed. The die body includes a mounting surface, a forming surface, and a plurality of flow channels. The mounting surface is located on the storage portion side of the die base. The forming surface is located on the opposite side of the mounting surface. The flow channels pass through the die body from the mounting surface to the forming surface. The opening/closing member is disposed between the die base and the die body. The opening/closing member includes a plurality of through holes corresponding to the plurality of flow channels. The opening/closing member is configured to be movable with respect to the die base and the die body such that each of the through holes brings the corresponding flow channel and the storage portion into communication.

公开(公告)号：US20230150004A1

公开(公告)日：2023-05-18

申请号：US17916353

申请日：2021-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenta UENISHI ,  Toshiya SUZUKI

IPC: B21D24/04 ,  B21D24/14 ,  B21D22/20

CPC classification number: B21D24/04 ,  B21D24/14 ,  B21D22/20

Abstract: A hot press apparatus includes a first die part 2 and a second die part 3, and a control unit 9. At least one of the first and second die parts 2 and 3 includes a recess 3a in the surface facing the other die part in the direction of pressing. A movable die part 4 is provided in the recess 3a. The control unit 9 controls the movable die part 4 such that the bottom-dead-center holding period, for which the first and second die parts 2 and 3 are at the bottom-dead center, includes an abutment period for which the movable die part 4 abuts the metal sheet B and a non-abutment period for which the movable die part does not abut the metal sheet B.