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.
Claims17
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.
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,
- 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.
Dependencies are inferred from the claim text.