Induction hardening of heat treated gear teeth

Details Induction hardening of heat treated gear teeth Induction hardening of heat treated gear teeth

1998-05-01

2000-05-09

Yee, Deborah

Metal treatment

Stock

Carburized or nitrided

148902, C23C 822, C22C 3800

Patent

active

060598980

ABSTRACT:
Induction hardening of heat treated gear teeth which includes the steps of rough and finish cutting the gear teeth, or alternatively cutting the gear teeth to their final configuration utilizing a one cut method, carburizing the gear and in particular, the gear teeth, slow cooling, or alternatively drawing back the gear so the gear teeth are not hard, and induction hardening the gear teeth heating only the surface of the gear teeth. This results in improved strength for the gear teeth as a result of increased residual compressive stresses therein. Induction heating of only the surface of the gear teeth results in an relatively low case depth in the root of the gear teeth. Since the residual compressive stresses increase as the case depth decreases, the fatigue life of such a gear will be improved as compared to gears produced using known prior art methods which utilize the case depth from the carburizing process which results in a relatively deeper case and, therefore, lower residual compressive stresses in the gear teeth and a less than desirable fatigue life.

REFERENCES:
patent: 2167798 (1939-08-01), Denneen et al.
patent: 3357869 (1967-12-01), Shepeljakovsky
patent: 3885996 (1975-05-01), Abe
patent: 3891474 (1975-06-01), Grange
patent: 4173501 (1979-11-01), Hildebrandt et al.
patent: 4639279 (1987-01-01), Chatterjee

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