Toyota Jidosha Kabushiki Kaisha

Nippon Steel Corporation

Kouichi Mine

Akio Hotta

Kenji Shimoda

Kazumasa Yamazaki

Takeshi Nishiwaki

A manufacturing method of a core for a rotary electric machine includes: forming a crimped portion on both a first magnetic steel sheet and a second magnetic steel sheet. The crimped portion has a recessed portion that is recessed from a first surface and a protruding portion that protrudes from a second surface in a position on the reverse side of the recessed portion on the second surface; and stacking the first magnetic steel sheet and the second magnetic steel sheet while curving the first magnetic steel sheet such that a first surface side bulges out, and inserting the protruding portion of the crimped portion of the second magnetic steel sheet into the recessed portion of the crimped portion of a curved first magnetic steel sheet.

Manufacturing method of core for rotary electric machine

Nitriding steel excellent in formability and susceptibility to nitriding

A method for manufacturing a cup-shaped article includes making the thickness of a cylinder portion of a cup-shaped configuration uniform, between a step of drawing a flat plate material portion into a cup-shaped configuration and a step of ironing the cup-shaped configuration into a final cup-shaped article. Increasing the thickness may be performed by coining or axial compression. The thickness increasing step may be replaced by a step, provided prior to the drawing step, of providing a plate material portion having a greater thickness at a radially inner portion than at a radially outer portion.

Method of manufacturing a cup-shaped article

Growing community of inventors

Higashikamo-gun, Japan

Kouichi Mine