Device and method for producing roll-formed part

A roll-formed part production device, comprising:

• rolls including:
• a transfer roll that contacts at least an outer periphery of a workpiece and transfers the workpiece in a longitudinal direction;
• a support roll that is located downstream of the transfer roll on a bending path and that contacts at least an inner periphery of the workpiece and defines a support point at which the workpiece is bent, the support roll including an inner support roll and an outer support roll;
• and
• a bending roll that is located downstream of the support roll on the bending path and that contacts at least the outer periphery of the workpiece and bends the workpiece;
• a roll driver actuator that moves the transfer roll, the support roll, and the bending roll in a width direction of the workpiece;
• and
• circuitry including a processor and memory, wherein
• an amount of movement of each of the rolls in the width direction is set as an amount of contact movement of each of the rolls in accordance with a position of the workpiece in the longitudinal direction based on the width dimension of the workpiece,
• an amount of movement of the workpiece in the width direction at a point where the workpiece contacts the support roll is set as an amount of origin shift in accordance with the position of the workpiece in the longitudinal direction based on the amount of contact movement of the support roll,
• an amount by which each of the rolls moves in the width direction in accordance with the position of the workpiece in the longitudinal direction is set as a first amount of movement of each of the rolls by combining the amount of contact movement of each of the rolls and the amount of origin shift,
• an amount by which the bending roll moves in the width direction in accordance with the position of the workpiece in the longitudinal direction to bend an outer contour of the workpiece to a predetermined curvature is set as a second amount of movement based on a shape of the workpiece at the point where the workpiece contacts the support roll, and
• the circuitry is configured to:
• obtain an amount of movement corresponding to a sum of the first and second amounts of movement of the bending roll as an amount of movement of the bending roll in the width direction;
• and
• based on the obtained amount of movement of the bending roll in the width direction, operate the roll driver actuator that moves the bending roll.