Coating method and coating device

Patent metadata

Field	Value
Publication number	US-9744558-B2
Application number	US-201314426963-A
Country	US
Kind code	B2
Filing date	Mar 11, 2013
Priority date	Sep 19, 2012
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

The present invention is intended to solve a problem that a coating film has an uneven thickness in the case where a coating target 1 has a stepped portion extending in a predetermined direction on its coating surface. To solve the problem, a follow-up coating is performed along the stepped portion S extending in the predetermined direction after coating of the entire coating surface of the coating target 1 so that paint mist adheres more to a relatively-recessed side of the stepped portion S.

First claim

The invention claimed is:

1. A method for providing an electrostatic coating on a coating target having, on a coating surface, a stepped portion extending in a predetermined direction where the stepped portion is defined as a portion having a relatively projected side and a relatively recessed side, the method comprising:
a first step of providing an entire surface coating on the entire coating surface of the coating target; and
a second step of providing, after the entire surface coating, a follow-up coating along the stepped portion extending in the predetermined direction so that paint mist adheres more to the relatively-recessed side of the stepped portion, wherein
a rotating bell-type coating gun by which the paint mist is supplied while swirling about a center of a bell is used in the follow-up coating, and
when the coating gun is moved in one direction along the stepped portion extending in the predetermined direction, swirling of the paint mist is reduced on one side of a movement line of a bell center of the coating gun due to air resistance caused by the movement of the coating gun, and the coating gun is moved only in the one direction along the stepped portion, with the one side facing the relatively-recessed side of the stepped portion.

2. The method of claim 1 , wherein
the coating target includes a pair of coating surfaces facing in opposite directions with respect to a center plane extending between the pair of the coating surfaces, and the coating surfaces have the stepped portions arranged symmetrically with respect to said center plane, and
in the follow-up coating, the coating gun moves along the stepped portions on the coating surfaces of the coating target in opposite directions so that the one side where the swirling of the paint mist is reduced due to the air resistance caused by the movement of the coating gun face the relatively-recessed side of each of the stepped portions on the coating surfaces of the coating target.

3. The method of claim 1 , wherein
the follow-up coating is provided by only 1 pass of the coating gun along the stepped portion.

4. The method of claim 1 , wherein
after the entire surface coating using a coating gun, the follow-up coating is provided using the same coating gun.

5. The method of claim 1 , wherein
the follow-up coating is provided by an oblique spray of paint from the relatively-recessed side to a relatively-projected side of the stepped portion, using a coating gun.

6. The method of claim 1 , wherein
a coating film formed by the entire surface coating and the follow-up coating has a visible light transmittance of 40% or more and 70% or less.

Assignees

• Mazda Motor

Inventors

• Shinoda Masafumi
• Kimura Minoru
• Tsuneoka Tatsuo
• Hirano Fumi

Classifications

• B05D1/40 Primary

  Distributing applied liquids or other fluent materials by members moving relatively to surface · CPC title

• B05B5/04

  characterised by having rotary outlet or deflecting elements {, i.e. spraying being also effected by centrifugal forces} · CPC title

• B05B5/08

  Plant for applying liquids or other fluent materials to objects · CPC title

• B05B13/0431

  with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to three-dimensional [3D] surfaces · CPC title

• B05B1/3405

  to produce swirl · CPC title