Title:
REMOLTEN CHILLED CAMSHAFT
Document Type and Number:
Japanese Patent JPH01190907
Kind Code:
A
Abstract:
PURPOSE:To improve the pitching resistance by forming an air-cooled chilled layer by preheating a casted iron alloy member and then melting the cam surface layer part again after said preheating. CONSTITUTION:After a camshaft member made of a casted iron alloy is preheated, said member is molten again by the irradiation of a high density energy heat source. Then, a chilled hardened layer 3 is formed through air cooling. A heat-influenced layer 4 after remelting is formed to a hardened layer consisting of the mixed structure of martensite, bentonite transformation phase, and troostite having a thickness of 0.5-2mm. Therefore, the formation of pearlite structure is prevented, and the pitching resistance can be improved.
Inventors:
WATANABE KOUJI
KANO MAKOTO
SAWADA SHIGEOKI
MAKINO RYOJI
KANO MAKOTO
SAWADA SHIGEOKI
MAKINO RYOJI
Application Number:
JP1417488A
Publication Date:
August 01, 1989
Filing Date:
January 25, 1988
Export Citation:
Assignee:
NISSAN MOTOR
International Classes:
F01L1/04; C21D9/30; F01L1/047; F16H53/02; (IPC1-7): C21D9/30; F01L1/04; F16H53/02
Domestic Patent References:
| JPS5923156A | 1984-02-06 | |||
| JPS60234168A | 1985-11-20 | |||
| JPS6047806B2 | 1985-10-23 | |||
| JPS61207519A | 1986-09-13 |
Attorney, Agent or Firm:
Yutaka Oshio