Honda Motor Co., Ltd.

Hitachi Astemo Ltd.

Kentaro Tokita

Hideki Kato

Keiichi Maekawa

Atsushi Murakami

Shinji Kasatori

Kenji Nagaoka

Toshihiro Ogawa

Hirokatsu Kameda

The invention relates to a method for manufacturing a coil spring and for determining a propelling condition for a shot medium. In a case where it is confirmed that the coating film remains in a third step, at least one or more of conditions of the shot peening treatment including a propelling speed of the shot medium, a propelling time of the shot medium, a material of the shot medium, and an average particle diameter of the shot medium are changed and the second step and the third step are repeated until the coating film does not remain. In a case where it is confirmed that the coating film does not remain in the third step, the condition of the shot peening treatment in the second step in which the coil spring is obtained with no remaining coating film is determined as the propelling condition for the shot medium.

Method for determining propelling condition for shot medium, and method for manufacturing coil spring

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Tokyo, Japan

Kentaro Tokita