Film forming method

Patent metadata

Field	Value
Publication number	US-2022154344-A1
Application number	US-201917598922-A
Country	US
Kind code	A1
Filing date	Mar 29, 2019
Priority date	Mar 29, 2019
Publication date	May 19, 2022
Grant date	—

Abstract

A film forming method forms a coating film on a workpiece having at least two film-deposited portions which are not continuous with each other by moving a nozzle of a cold spray device relative to each other along a continuous movement trajectory. The movement trajectory includes at least two trajectories corresponding to the film-deposited portions and a connecting trajectory linking the trajectories of the film-deposited portions. The film-deposited portions are formed by continuously spraying a raw material powder from the nozzle by cold spraying to form a coating film on each of the plurality of film-deposited portions. A turnback point of the spraying is set on the connecting trajectory where a relative speed between the workpiece and the nozzle decreases in the movement trajectory.

First claim

1 . A film forming method for forming a coating film on a workpiece having at least two film-deposited portions which are not continuous with each other, the film forming method comprising:
moving a nozzle of a cold spray device relative to the workpiece along a continuous movement trajectory including trajectories of the film-deposited portions and a connecting trajectory linking the trajectories of the film-deposited portions while continuously spraying a raw material powder from the nozzle, continuously spraying the raw material powder from the nozzle by cold spraying to form a coating film on each of the film-deposited portions by the moving of the nozzle along the trajectories for the film-deposited portions, and the spraying of the raw material powder by cold spraying to form the coating film on a surface of the workpiece extending between one of the film-deposited portions and another the film-deposited portions by the movement of the nozzle along the connecting trajectory; and setting a turnback point on the connecting trajectory where a relative speed between the workpiece and the nozzle decreases in the movement trajectory.

2 . The film forming method according to claim 1 , wherein
the turnback point on the connecting trajectory is set where the relative speed between the workpiece and the nozzle reaches zero in the movement trajectory.

3 . The film forming method according to claim 1 , wherein
the film-deposited portions are entire peripheries of openings of intake ports or exhaust ports of a cylinder head, and the turnback points are set on a surface of the cylinder head that attaches to a cylinder block.

4 . The film forming method according to claim 1 , further comprising increasing a distance between the nozzle and the film-deposited portions at the turnback point.

5 . The film forming method according to claim 1 , wherein
the setting of the turnback point on the connecting trajectory is set upstream from a film formation starting point of the film-deposited portions, and turnback points are set at a film formation finishing point of the film-deposited portions on the trajectories of the film-deposited portions.

Assignees

• Nissan Motor

Inventors

• Shibayama Hirohisa
• Kamada Koukichi
• Tainaka Naoya
• Utsumi Yoshito
• Matsuyama Hidenobu
• Shiotani Eiji
• Ogiya Toshio
• Suzuki Haruhiko

Classifications

• B22D19/0081

  pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal · CPC title

• C23C24/04 Primary

  Impact or kinetic deposition of particles · CPC title

• F02F1/00

  Cylinders; Cylinder heads · CPC title

• F02F2200/06

  Casting · CPC title

• B22D19/0009

  Cylinders, pistons · CPC title