Abstract: A press forming process forms a blank, which is the material to be pressed, into a product having a predetermined shape including a continuous hat-shaped section in the longitudinal direction and a curved portion protruding toward the top surface side in the longitudinal direction. In the press forming process, an intermediate product which has an excess thickness portion formed at a part of the curved portion of the product and protruding higher than the top surface of the product is formed while constraining the portion of the intermediate product other than the excess thickness portion until the excess thickness portion projects in a direction opposite to the protrusion direction thereof, whereby the intermediate product is formed into a predetermined shape.

Abstract: A workpiece bending method of forming a final formed article that has two surfaces on opposite sides of an inclined area, in which an inclined area is made up of a first bend portion, a second bend portion, and a flat surface portion, includes: cantilevering an end portion of a workpiece by a stationary die and a holding member; and curving an area in the workpiece that corresponds to the flat surface portion by moving a movable die to the stationary die so that the movable die presses a free-end side of the workpiece, and then forming the first bend portion and the second bend portion, and unbending the area in the workpiece that corresponds to the flat surface portion of the inclined area, by causing the movable die to press the workpiece to the stationary die.

Abstract: Provided is a press forming method in which the dimensional accuracy is improved and the cost for mass production can be reduced through the reduction of the number of the die corrections, etc. A press forming process forms a blank, which is the material to be pressed, into a product having a predetermined shape including a continuous hat-shaped section in the longitudinal direction and a curved portion protruding toward the top surface side in the longitudinal direction. In the press forming process, an intermediate product which has an excess thickness portion formed at a part of the curved portion of the product and protruding higher than the top surface of the product is formed while constraining the portion of the intermediate product other than the excess thickness portion until the excess thickness portion projects in a direction opposite to the protrusion direction thereof, whereby the intermediate product is formed into a predetermined shape.

Abstract: A workpiece bending method of forming a final formed article that has two surfaces on opposite sides of an inclined area, in which an inclined area is made up of a first bend portion, a second bend portion, and a flat surface portion, includes: the workpiece holding step of cantilevering an end portion of the workpiece by a stationary die and a holding member; and the forming step of curving an area in the workpiece that corresponds to the flat surface portion by moving a movable die to the stationary die so that the movable die presses a free-end side of the workpiece, and then forming the first bend portion and the second bend portion, and unbending the area in the workpiece that corresponds to the flat surface portion of the inclined area, by causing the moving die to press the workpiece to the stationary die.