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: An incremental forming method includes pressing a rod-shaped tool into a workpiece and stretching the workpiece little by little while moving the rod-shaped tool so that a percentage of decrease in plate thickness of the workpiece after forming with respect to plate thickness of the workpiece before forming is made to be within a range of 35% to 40%, inclusive.

Abstract: A forming method of a metal plate includes press-forming the metal plate with a die, and processing the press-formed metal plate by incremental-forming.

Abstract: A current density changing portion is formed in a heating process on an upper base side with respect to a center portion of a flat metal plate in a direction of current flow, by passing current from a lower base side to the upper base side of the flat metal plate which is rectangular when viewed from above. As a result, a quenchable portion is formed on the upper base side with respect to the center portion of the flat metal plate in the direction of current flow, and a non-quenchable portion is formed on the lower base side with respect to the center portion of the flat metal plate in the direction of current flow. The flat metal plate is press-formed after the heating process, so a complex die cooling structure is not necessary during press-forming, which enables the die cost to be reduced.

Abstract: An incremental forming method includes pressing a rod-shaped tool into a workpiece and stretching the workpiece little by little while moving the rod-shaped tool so that a percentage of decrease in plate thickness of the workpiece after forming with respect to plate thickness of the workpiece before forming is made to be within a range of 35% to 40%, inclusive.

Abstract: [Problem] To provide a method for producing a non-rectangular steel sheet to be heated to the predetermined temperature, a method and apparatus for producing a press-molded article using the non-rectangular steel sheet for press molding that is produced by means of that method for producing the same. [Solution] The method for producing a steel sheet for press molding according to one embodiment of the invention includes an electrical heating process (STEP-101) for electrically heating a blank (10) of rectangular steel sheet, viewed from the thickness direction of the blank, and a bending process (STEP-102) for deforming the blank (10) from a rectangle to a non-rectangle by applying stress in a horizontal direction to the surfaces (front (10a) and back (10b)) of the blank (10) after the start of electrical heating.

Abstract: A forming method of a metal plate includes press-forming the metal plate with a die, and processing the press-formed metal plate by incremental-forming.

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: Provided is a method for rapidly, surely, and easily identifying a factor of a shape defect of an artifact attributed to elastic recovery of deformation upon molding by using the numeric value simulation technique, thereby eliminating lowering of dimension accuracy.

Abstract: A current density changing portion is formed in a heating process on an upper base side with respect to a center portion of a flat metal plate in a direction of current flow, by passing current from a lower base side to the upper base side of the flat metal plate which is rectangular when viewed from above. As a result, a quenchable portion is formed on the upper base side with respect to the center portion of the flat metal plate in the direction of current flow, and a non-quenchable portion is formed on the lower base side with respect to the center portion of the flat metal plate in the direction of current flow. The flat metal plate is press-formed after the heating process, so a complex die cooling structure is not necessary during press-forming, which enables the die cost to be reduced.

Abstract: Provided is a method for rapidly, surely, and easily identifying a factor of a shape defect of an artifact attributed to elastic recovery of deformation upon molding by using the numeric value simulation technique, thereby eliminating lowering of dimension accuracy.