Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1993-10-19
1994-11-01
Dean, Richard O.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148588, 148714, 148903, 21912137, 21912139, 21912159, C21D 918
Patent
active
053604954
ABSTRACT:
An apparatus and process for hardening cutting edges having various widths. The apparatus includes a plasma torch for projecting a plasma beam through an outlet nozzle. The outlet nozzle has a length parallel to the cutting edge and a width perpendicular to the cutting edge. The nozzle width is greater than the nozzle length. A variable electromagnet is located adjacent the nozzle for adjustably deflecting the plasma beam from a circular cross section beam to a widened beam. The electromagnet deflects the plasma beam at its width so that it is slightly wider than the width of the cutting edge to be hardened. The plasma beams with a smaller cross section have a lower power consumption and a constant gas flow rate than larger cross sectional beams.
REFERENCES:
patent: 3615924 (1971-10-01), Swoboda et al.
patent: 3834947 (1974-09-01), Swoboda et al.
WO 83/00051 Jan. 6, 1983.
Advances in Welding Processes; vol. 1, 1978 (Proc. Conf. 9-11 May 1978), pp. 181-184 D. Goodwin et al "Surface heat treatment . . . ".
Schuler Albert
Tokmakov Wladimir
Dean Richard O.
Ip Sikyin
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