Electric heating – Metal heating – By arc
Patent
1976-02-27
1977-04-12
Truhe, J. V.
Electric heating
Metal heating
By arc
B23K 2600
Patent
active
040177084
ABSTRACT:
A method of heat treating a bore in a workpiece to increase its surface hardness is disclosed, including shaping an annular laser beam emanating from a source into an elongated focal pattern to provide a more evenly distributed energy level in cross section, directing the elongated focal pattern generally axially inwardly toward the bore, reflecting the elongated focal pattern from a mirror arrangement substantially transversely upon a surface of the bore to provide an instantaneously more uniformly hot heating zone thereat, and effecting relative motion between the workpiece and the mirror arrangement so that the bore is progressively scannably heat treated to minimize heating of the entire workpiece.
REFERENCES:
patent: 2556236 (1951-06-01), Strickland, Jr.
patent: 2604419 (1952-07-01), Herbenar
patent: 3154370 (1964-10-01), Johnson
patent: 3772496 (1973-11-01), Harendza-Harinxma
patent: 3773565 (1973-11-01), Pye et al.
patent: 3802927 (1974-04-01), Gomada
patent: 3848104 (1974-11-01), Locke
IBM Technical Disclosure vol. 14, No. 9, 2/1972, "Optical System for Laser Machining of Narrow Slots."
Engel Simon L.
Gale Preston L.
Lenzen, Jr. Glenn H.
Caterpillar Tractor Co.
Lanchantin, Jr. Charles E.
Paschall Mark
Truhe J. V.
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