Hot press apparatus and method of manufacturing hot-press-formed product
AssigneeNippon Steel Corporation
InventorsKenta UENISHI, Toshiya SUZUKI
Life of this patent
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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.
Claims15
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.
A method of manufacturing a hot press-formed product, comprising:
- positioning a heated metal sheet between a first die part and a second die part;
- press forming the metal sheet by moving the first die part and the second die part closer to each other in a direction of pressing;
- holding the metal sheet while the first die part and the second die part are at a bottom-dead center;
- and
- moving, to the metal sheet, a movable die part provided in a recess in at least one of the first die part and the second die part during a bottom-dead-center holding period for which the metal sheet is held at the bottom-dead center,
- wherein the bottom-dead-center holding period 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.
Dependencies are inferred from the claim text.