Denso Corporation

Yasuhiro Hideshima

Masahiro Takada

Kiyokazu Futami

Kazuyuki Kitou

A method of manufacturing a yoke of an electric rotary machine is disclosed. The manufacturing method includes providing a cutout steel plate having one end formed with a plurality of concave portions and the other end formed with a plurality of protrusions, rolling the cutout steel plate into a cylindrical shape until a distal end of each protrusion faces the inlet of each concave portion, inserting the protrusions into the concave portions, respectively, in a circumferential direction, and conducting punch-caulking press on each protrusion at near-wall areas on both sides thereof in close proximity to indents of each concave portion to form localized expanding portions at the near-wall areas on both sides of each protrusion while causing the localized expanding portions to flow axially outward to be fitted into the indents of each concave portion, respectively.

Method of manufacturing yoke of electric rotary machine

A method of fabricating an annular component part is disclosed wherein press forming is carried out to prepare an annular body having a cylindrical wall, having a root portion and a distal end, and an annular flange portion. The fabricating method comprises expanding an inner circumferential periphery of the cylindrical wall to an inner diameter corresponding to an inner diametric concave portion formed on the inner circumferential periphery and squeezing the cylindrical wall in a tapered profile such that the inner diameter of the cylindrical wall gradually decreases. During inner diametric expanding operation, an annular shoulder is formed on the inner circumferential periphery of the cylindrical wall and plays a role as an undercut of the annular component.

Growing community of inventors

Anjo, Japan

Yasuhiro Hideshima