US 12,263,516 B2
Hot press apparatus and method of manufacturing hot-press-formed product
Kenta Uenishi, Tokyo (JP); and Toshiya Suzuki, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/916,353
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Mar. 30, 2021, PCT No. PCT/JP2021/013497
§ 371(c)(1), (2) Date Sep. 30, 2022,
PCT Pub. No. WO2021/200923, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-067815 (JP), filed on Apr. 3, 2020.
Prior Publication US 2023/0150004 A1, May 18, 2023
Int. Cl. B21D 22/06 (2006.01); B21D 22/20 (2006.01); B21D 24/04 (2006.01); B21D 24/14 (2006.01)
CPC B21D 24/04 (2013.01) [B21D 22/06 (2013.01); B21D 22/20 (2013.01); B21D 24/14 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A hot press apparatus comprising:
a first die part;
a second die part capable of moving relative to the first die part in a direction of pressing; and
a control unit adapted to control relative movement of the first die part and the second die part,
wherein at least one of the first die part and the second die part includes a recess in a surface facing the other die part in the direction of pressing,
a movable die part is provided in the recess, the movable die part movable in a direction crossing the surface facing the other part, and
the control unit controls a position of the movable die part such that a heated and press formed metal sheet is held between the first die part and the second die part and a bottom-dead-center holding period for which the first die part and the second die part are at a bottom-dead center includes an abutment period for which the movable die part is at an abutment position where the movable die part abuts the metal sheet and a non-abutment period for which the movable die part is at a retracted position where it does not abut the metal sheet,
wherein when the movable die part is at the abutment position, an abutment surface of the movable die part against the metal sheet is positioned to be flush with a portion of the surface of the first die part or the second die part to be in contact with the metal sheet that surrounds the recess provided with the movable die part, and
wherein during the bottom-dead-center holding period, the movable die part is controlled to move only between the abutment position and the retracted position.