Tsubakimoto Chain Company

Yoshitaka Yoshimura

Shuji Sasamoto

Takero Nakagawa

Tomofumi Otani

Sachihiko Maeda

Masaharu Tamaki

Hiroshi Kobayashi

Joichi Nakamura

The present invention improves accuracy in the axial dimension of rolled parts for a chain such as bushings, rollers and similar. A rolled part is manufactured by cutting a strip of steel into a rectangular shape to obtain a rectangular base material having a predetermined dimension, The rectangular base material is rolled into a clindrical shape to obtain a cylindrically formed part having cut end surfaces face each other. A core is inserted for rolling the rectangular base material into the cylindrically formed part. The cylindrically formed part is then pressed through a die having a circular opening. The rolled part has a plurality of blind grooves on a surface thereof. While the cylindrically formed part is being pressed through the die having a circular opening, a plastic flow of the material of the cylindrically formed part intensively occurs in a direction toward the blind grooves. Since the plastic deformation of the rolled part is absorbed by the blind grooves, axial dimension of the rolled part hardly varies,

Rolled part for chain and manufacturing method therefor

Link plate for a chain

Growing community of inventors

Ashiya, Japan

Yoshitaka Yoshimura