Nhk Spring Co., Ltd.

Yoshimitsu Koyama

Tatsuya Watanuki

Mitsuhiro Sugiyama

Provided is a coil spring manufacturing method. In the coil spring manufacturing method, a coil spring of a vehicle suspension member is immersed in a fluidized bed in which powder coat is fluidized for coating. The fluidized bed includes a vertical stream area in which the powder coat moves upward and downward. The coil spring is immersed in the vertical stream area of the fluidized bed while an end coil of the coil spring faces upward, and is periodically subjected to a relative movement with respect to a direction containing components vertical to a central axis of the coil spring in relation to the vertical stream area.

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Kitakami, Japan

Yoshimitsu Koyama