Electric heating – Metal heating – Of cylinders
Patent
1984-04-20
1985-07-23
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1057, 219 1067, 219 1079, 266129, 148150, H05B 638
Patent
active
045310360
ABSTRACT:
A method and apparatus for hardening a small internal passage in a workpiece wherein the workpiece is indexed into coaxial alignment between axially spaced inductor coils and an actuator telescopically inserts a magnetically permeable flux concentrating rod through the passage, and coextensive with the coils and in inductive relationship with the interior surface, such that upon energization of the coils, flux is concentrated in the concentrating rod and effectively inductively delivered to the surface to raise the temperature thereof to a heat treating temperature, the actuator being extended to another position wherein a quenching ring is disposed adjacent to the surface for delivering coolant thereto to quench harden the surface, the actuator being finally retracted to allow sequential indexing of workpieces.
REFERENCES:
patent: 3209114 (1965-09-01), McBrien
patent: 3338759 (1967-08-01), Ledl et al.
patent: 3684852 (1972-08-01), Seyfried
patent: 3708645 (1973-01-01), Osborn
patent: 3846609 (1974-11-01), Enk
patent: 3988559 (1976-10-01), Capolongo
patent: 4251705 (1981-02-01), Badzer
patent: 4311896 (1982-01-01), Junya
Leung Philip H.
Park-Ohio Industries, Inc.
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