Cam shaft manufacturing process

Details Cam shaft manufacturing process Cam shaft manufacturing process

1979-06-05

1980-10-28

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 35, 148 39, 148125, C22C 3700, C21D 930

Patent

active

042305063

ABSTRACT:
A cam shaft manufacturing process wherein a cam shaft is cast from a heat-treatable gray cast iron having a high carbide microstructure, is annealed while retaining the carbides and then cooled to room temperature. Surfaces, such as cam lobe surfaces, are then surface hardened and the cam shaft may thereafter be machined. The heat treating process comprises heating the cam shaft at 1600.degree. F. (871.degree. C.) in about twenty minutes, holding the cam shaft at 1600.degree. F. (871.degree. C.) for about twenty minutes and thereafter heat treating the cam shafts at a temperature of 1600.degree. to 1640.degree. F. (871.degree. to 893.degree. C.) for about eighty minutes. The cam shafts are then cooled rapidly to about 400.degree. F. (204.degree. C.), for example, within about an hour and a half, and thereafter air cooled.

REFERENCES:
patent: 3005736 (1961-10-01), Peras
patent: 3370941 (1968-02-01), Kueny
patent: 3384515 (1968-05-01), Ackerman et al.
patent: 3690957 (1972-09-01), Thompson
patent: 4032334 (1977-06-01), Burk et al.
patent: 4043847 (1977-08-01), Just
patent: 4124413 (1978-11-01), Komatsu et al.

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