System for hardening gears by induction heating

Details System for hardening gears by induction heating System for hardening gears by induction heating

1987-10-07

1988-11-15

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1071, 219 1077, 266125, 266129, H05B 614

Patent

active

047851473

ABSTRACT:
An apparatus for hardening the outwardly facing teeth surfaces of a gear is disclosed. First and second induction heating coils with power sources controlled by an appropriate microprocessor heat the gear when in the first coil at a precisely controlled cycle to generate an unstable, circular band of high temperature positioned radially inwardly from the tips of the gear. Before the band can dissipate, the microprocessor actuates an appropriate drive to locate the gear in the second coil energized by an appropriate power source to impart a high skin temperature to the teeth. A liquid spray quench in the second coil is immediately actuated to effectively quench the gear. By sizing the cycles, the apparatus is thus able to rapidly harden the gear teeth at minimal power levels.

REFERENCES:
patent: 2167798 (1939-08-01), Denneen et al.
patent: 2444259 (1948-06-01), Jordan
patent: 2590546 (1952-03-01), Kincaid et al.
patent: 2689900 (1954-09-01), Redmond et al.
patent: 3446495 (1969-05-01), Pfaffmann et al.
patent: 4251704 (1981-02-01), Masie et al.
patent: 4363946 (1982-12-01), Busemann
patent: 4675488 (1987-06-01), Mucha

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