Heat-treated article

Details Heat-treated article Heat-treated article

1973-02-22

1978-09-12

Britts, Ramon S.

Metal treatment

Stock

Ferrous

148147, F16B 2500, F16B 3306

Patent

active

041128125

ABSTRACT:
An article is hardened or tempered in a localized zone. Where the article is a thread-forming device the zone is that part of its thread that does the thread-forming in the workpiece. The hardness of the remainder of the body of the article is left unchanged. The localized hardening is carried out by a method that includes high frequency induction heating only of the zone followed by quenching of the zone whereby the hardened zone is a skin of predetermined depth. A machine for making articles in accordance with the method comprises means for delivering the articles in succession to an induction heating element, a mechanism for advancing the articles through the heating element for progressive heating of the surface of the article in the localized zone to a predetermined depth, a quenching manifold for applying a spray of quenching liquid to the heated article, and means for removing the heated articles from the heating element and conveying them to the quenching manifold.

REFERENCES:
patent: 1909476 (1933-05-01), Trotter
patent: 2215930 (1940-09-01), Mahla
patent: 2229565 (1941-01-01), Hallowell, Jr.
patent: 2352982 (1944-07-01), Tomalis
patent: 3195156 (1965-07-01), Phipard
patent: 3213742 (1965-10-01), Kahn
patent: 3344817 (1974-06-01), Connard

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