Thk Co., Ltd.

Denki Kogyo Company, Limited

Junzo Shimbe

Toru Takahashi

Makoto Nagata

Hiroyuki Kai

Hiroshi Nakabayashi

Takayuki Sakanoue

Kazuki Yoshiya

Shuji Masubuchi

Hidetada Suzuki

This hollow shaft memberincludes paired diameter-reduced sectionsrespectively formed at both shaft ends of a hollow shaft-like tubular material by performing swaging processing on both the shaft ends, and an intermediate sectionlocated between the paired diameter-reduced sections, and having an outer diameter larger than an outer diameter of the paired diameter-reduced sections. Shapes of connection boundaries between the intermediate sectionand the diameter-reduced sectionsare formed as perpendicular step-shaped sectionsstepped substantially perpendicular to an axial direction, and the perpendicular step-shaped sectionsare formed by the swaging processing.

Hollow shaft member and rolling device

A heat-treatment deviceincludes a tableon which a ring-shaped workpiece W can be placed, and a pair of heat processing unitsfor heat-processing the peripheral surface of the workpiece W. The heat-treatment deviceis used for obtaining the workpiece W having desired properties by the heat-processing the workpiece W while the pair of heat processing unitsmove in opposite directions along the peripheral surface of the workpiece W. The heat-treatment deviceis configured in such a way that a pair of revolving armsmovable relative to the tableoscillate the pair of heat processing unitsrelative to the workpiece W, thereby heat-processing the peripheral surface of the workpiece W. By adopting such a configuration, it is possible to obtain a heat-treatment device heat-processing the entire circumference of a ring-shaped workpiece.

Heat-treatment device and heat-treatment method

Growing community of inventors

Tokyo, Japan

Junzo Shimbe