Mitsubishi Electric Corporation

Osaka University

Naohiko Harada

Shogo Okamoto

Takuya Ikeda

Yoshihiro Harada

Hidetoshi Fujii

Takushi Takizawa

Kensaku Kuroki

Muneaki Mukuda

Shigenobu Tochiyama

Hiroya Ikuta

Keisuke Murase

Michiya Yasui

Seiiyu Ishimoto

Syuichi Tamura

Tetsuya Amasaki

A pressure receiving surface inclined to a rotation axis is provided on the side surface of a stir probe of a rotating tool. The pressure receiving surface includes a pressure receiving region which is always perpendicular to a rotation tangential direction in a cross section perpendicular to the rotation axis. In friction stir processing, the stir probe is caused to rotate in a rotation direction B in which the normal direction of the pressure receiving surface is positive. According to this kind of rotating tool, as it has no shoulder, a joint width does not increase even when a stirring region is deep, and also, a plastic flow in a rotation direction is generated by a pressure receiving surface, so that it is possible to reduce the proportion of the plastic flow in the rotation axis direction, and thus possible to suppress an occurrence of burr.

Rotating tool for and method of friction stir welding

The stator core is configured into a cylindrical shape by abutting a laminated core that is obtained by bending and forming a rectangular parallelepiped lamination and integrating the stator core by welding. The lamination is configured by laminating a predetermined number of thin strip-shaped magnetic plates that are formed so as to have a flat rectangular shape, and in addition at least two thin sheet coupling weld portions that integrate the predetermined number of thin strip-shaped magnetic plates by welding are formed so as to extend from a first end to a second end in a direction of lamination on an outer wall surface of the lamination and so as to have a predetermined spacing in a longitudinal direction of the lamination. The stator core is formed such that an axial length A at the thin sheet coupling weld portions and a maximum axial length B between the thin sheet coupling weld portions satisfy an expression:mm&#x2266;B&#xb7;A&#x2266;mm.

Dynamoelectric machine

A holding jig is made into cylindrical body that has a conductor insertion aperture, and a conductor end portion is inserted into the conductor insertion aperture in a loosely-fitted state and held. The holding jig is moved along an arc that has a radius L that is centered around a projecting root portion of the conductor end portion to a vicinity of a coil end to bend and form the conductor end portion into a desired lead around shape.

Dynamoelectric winding end portion forming apparatus

Growing community of inventors

Chiyoda-ku, Japan

Naohiko Harada