Electric heating – Metal heating – Of cylinders
Patent
1988-08-08
1989-08-08
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1059, 219 1077, 266129, 148147, H05B 614
Patent
active
048555517
ABSTRACT:
Method and 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 preheat the gear when in the first coil at precisely controlled cycles 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 gear teeth are rapidly hardened at minimal power levels.
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Mucha George M.
Novorsky Donald E.
Pfaffmann George D.
Leung Philip H.
Tocco, Inc.
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