公开(公告)号：US11065641B2

公开(公告)日：2021-07-20

申请号：US16100053

申请日：2018-08-09

Applicant: NHK SPRING CO., LTD.

Inventor： Yoshimitsu Koyama ,  Mitsuhiro Sugiyama ,  Tatsuya Watanuki

IPC: B05D1/24 ,  B05C19/02 ,  F16F1/06 ,  B05D3/00 ,  B05C3/02 ,  B05D7/00 ,  B60G11/14

Abstract: 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.