Device and method for producing roll-formed part

A method, comprising:

• setting an amount of movement of rolls including a support roll that defines a point a point at which a workpiece is bent and a bending roll that bends the workpiece in a width direction as an amount of contact movement of the corresponding roll in accordance with a position of the workpiece in a longitudinal direction based on a width dimension of the workpiece,
• setting 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,
• setting 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 as a first amount of movement of the corresponding roll by combining the amount of contact movement of the corresponding roll and the amount of origin shift,
• setting 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 as a second amount of movement based on a shape of the workpiece at the point where the workpiece contacts the support roll;
• obtaining 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
• moving the bending roll based on the obtained amount of movement of the bending roll in the width direction.