Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1981-07-22
1983-08-30
Andrews, M. J.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148146, 266123, 266127, C21D 110, C21D 118, C21D 142
Patent
active
044014856
ABSTRACT:
A method and apparatus of quench hardening to a desired depth the inner surface of an axially extending bore in an elongated, thin-walled workpiece having an outer, axially extending surface wherein the bore has a selected, uniform cross-sectional shape, which method and apparatus involves providing an inductor with an outer shape generally matching, but smaller than, the cross-sectional shape of the bore, supporting the workpiece with the axis extending vertically, energizing the inductor with a known frequency and at a selected power level, moving the energized inductor downwardly through the bore to inductively heat the inner surface progressively while applying no fluid quench to the inner surface, letting the workpiece cool and then moving the inductor upwardly through the bore to progressively heat the inner surface while progressively liquid quenching the inner surface immediately below and after the progressive heating operation.
REFERENCES:
patent: 2076515 (1937-04-01), Kinzel
patent: 2541116 (1951-02-01), Somes
patent: 3278349 (1966-10-01), Huseby et al.
patent: 3915763 (1975-10-01), Jennings et al.
Somes, H. E., "The Development of High Speed Induction Heating for the Hardening of Internal Diameters", in Transactions of the Electrochemical Society, vol. 79, 1941.
Andrews M. J.
Park-Ohio Industries, Inc.
Schiavelli Alan E.
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