Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Kobe Seiko Sho

Aisin Takaoka Co., Ltd.

Kiyoshi Nonomura

Jiro Iwaya

Takayuki Yamano

Koji Inoue

Koji Kurozumi

Hiroshi Sato

Kazuhisa Maeda

Yuki Ishiguro

Masashi Ozawa

Yoshiyuki Fukuyama

Hiroyuki Horiuchi

Hideaki Ikezawa

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.

Press forming method

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.

Incremental forming method

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.

Metal plate forming method

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.

Press-forming method and press-formed part

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. The method includes a step of calculating a stress distribution and distortion distribution working on an artifact before elastic recovery; a step of calculating a deformation amount &#x3b4;0 based on the elastic recovery of an evaluation point when the stress distribution is given to the artifact shape before the elastic recovery; a step of dividing the artifact shape into a plurality of regions and calculating a deformation amount &#x3b4;n based on the elastic recovery of the evaluation point when the stress distribution is given to each of the regions of the artifact shape before the elastic recovery; and a step of comparing the deformation amount &#x3b4;0 and the deformation amount &#x3b4;n and identifying a region where the difference between them is minimum as a main affect region, i.e., a stress distribution region which most affects the shape defect of the evaluation point before and after the elastic recovery.

Shape defect factor identification method, device, and program

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Nisshin, Japan

Kiyoshi Nonomura