PRESS-FORMING METHOD AND PRESS-FORMING DEVICE

摘要

Provided is a press-forming method comprising: a step in which a workpiece (W) is pressed by a punch (20) having a forming recess (66) in a side wall, and is inserted together with the punch (20) into a cavity (14) in a die (16) while a first pressure force is applied to a pressure fluid (L) introduced in advance into the cavity (14); a step in which the distal area of the workpiece (W) is formed into a shape that follows the shape of the distal part of the punch (20) and the bottom part of the die (16) by causing the punch (20) to reach the lowermost point thereof; and a step in which a lateral area of the workpiece (W) is formed into a shape that follows the shape of the forming recess (66) by applying a second pressure force greater than the first pressure force to the pressure fluid (L) after the punch (20) has reached the lowermost point, and pressing on the lateral area of the workpiece (W) in the direction from the die (16) toward the forming recess (66) of the punch (20).