Coil spring manufacturing method and coil spring manufacturing device

Patent metadata

Field	Value
Publication number	US-11065641-B2
Application number	US-201816100053-A
Country	US
Kind code	B2
Filing date	Aug 9, 2018
Priority date	Feb 10, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

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.

First claim

What is claimed is:

1. A coil spring manufacturing method of a vehicle suspension member, the member comprising:
a coating bath in which a powder coat is filled;
a circulator which flows the powder coat to form a fluidized bed;
a relative movement mechanism which supports the coating bath; and
a conveyor which conveys a coil spring to the coating bath, the method being characterized in that
while the coil spring is immersed in the fluidized bed in which the powder coat flows for coating,
the fluidized bed includes a vertical stream area including an upstream area in which the powder coat flows from a lower side to an upper side and a downstream area in which the powder coat flows from the upper side to the lower side, the upstream area being formed at a center part of the fluidized bed, the downstream area being formed at an outer peripheral part of the fluidized bed,
the powder coat flowing upstream from the upstream area moves from the center part toward the outer peripheral part of the fluidized bed, on a surface side of the fluidized bed, and the powder coat flowing downstream from the downstream area moves from the outer peripheral part toward the center part of the fluidized bed, on a bottom side of the fluidized bed, and
the coil spring is immersed in the upstream area of the vertical stream area, which is formed at the center part of the fluidized bed, while an end coil of the coil spring faces upward, and the coil spring is periodically subjected to a relative movement with respect to a direction containing components vertical to a central axis of the coil spring so as to transversely cross the upstream area.

2. The coil spring manufacturing method of claim 1 , wherein the relative movement is horizontal rotation transversely crossing the flow of the powder coat.

3. The coil spring manufacturing method of claim 1 , wherein the vertical stream area is an upstream current area in which the powder coat flows upstream.

4. The coil spring manufacturing method of claim 1 , wherein the powder coat is an epoxy paint containing an anticorrosion component which forms a coating film to include bubbles.

Assignees

• Nhk Spring Co Ltd

Inventors

• Koyama Yoshimitsu
• Sugiyama Mitsuhiro
• Watanuki Tatsuya

Classifications

• B05C19/02 Primary

  using fluidised-bed techniques (fluidised-bed technique in general B01J8/24) · CPC title

• B05D7/00

  Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials {(coating of foodstuffs A23P20/17, A23P20/15, A23P20/18)} · CPC title

• B05C3/02

  the work being immersed in the liquid or other fluent material · CPC title

• B05D3/00

  Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials (successively applying liquids or other fluent materials B05D1/36; drying ovens F26B) · CPC title

• B05D1/24 Primary

  Applying particulate materials · CPC title