Press-forming apparatus

A press-forming apparatus that processes a plate-shaped workpiece, the press-forming apparatus comprising:

• a punch configured to move in a pressing direction;
• a die including a hollow part into which the punch is inserted and an inclined surface inclined toward the hollow part;
• a die plate configured to hold the die;
• a blank holder disposed between the punch and the die and that includes a holding surface facing the inclined surface of the die, and a clearance provided between the holding surface of the blank holder and the die;
• a die load sensor configured to detect a load generated on the inclined surface of the die by detecting load components in three directions including a pressing direction, a first direction perpendicular to the pressing direction, and a second direction perpendicular to the pressing direction and the first direction;
• a controller configured to calculate a normal force on the die based on the loads in the three directions detected by the die load sensor, configured to determine whether to perform clearance correction based on the calculation result of the normal force, and configured to calculate an amount of correction of clearance regarding the clearance when it is decided to perform the clearance correction;
• a first driver configured to move the die in the pressing direction based on the amount of correction of clearance to change a position of the die in the pressing direction at the time of machining the workpiece;
• and
• a second driver configured to drive the punch in the pressing direction.