Method and apparatus for the surface hardening of the inner surf

Details Method and apparatus for the surface hardening of the inner surf Method and apparatus for the surface hardening of the inner surf

1975-05-29

1977-06-21

Lake, Roy

Metallurgical apparatus

Having means for contacting a solid metalliferous material...

With heating means, e.g., flame contact

148144, 148151, 134166C, 432224, 266127, 266261, C21D 908

Patent

active

040307115

ABSTRACT:
Method and apparatus for flame hardening the inner wall surface of tube bends of a circular configuration wherein either a flame hardening burner is passed longitudinally through the internal cavity of a tube bend which is mounted in a fixed position, or alternatively the tube bend is moved over a stationary flame hardening burner. This relative movement between tube bend and burner is effected along a circular path corresponding to the longitudinal center line of the tube bend. Subsequently to flame hardening the heated inner wall surface of the tube bend is quenched with cooling water discharged from water sprinklers disposed downstream of the flame hardening zone. During flame hardening and quenching the tube bend is continuously maintained in positions such that the quenching water may leave the tube bend by gravity. The apparatus includes mounting means for the tube bend, the flame hardening burner and the associated cooling means and allows relative movement between the tube bend on the one hand and the burner and cooling means by means of a drive assembly.

REFERENCES:
patent: 1697068 (1929-01-01), Kenney
patent: 2273809 (1942-02-01), Kinzel
patent: 2318145 (1943-05-01), Emery et al.
patent: 2482945 (1949-09-01), Smith
patent: 3043317 (1962-07-01), Hursen

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