Process for high-temperature carburizing treatment of track bush

Details Process for high-temperature carburizing treatment of track bush Process for high-temperature carburizing treatment of track bush

1983-10-20

1985-01-22

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

148 36, C23C 1110

Patent

active

044950047

ABSTRACT:
Process for the production of track bushes for tractors and track vehicles, with resultant savings in energy, shorter treatment times and consistently high product quality. A plurality of low carbon boron steel bushes are assembled as a charge in a basket. The charge is preheated in a pretreatment chamber of a furnace having a carburizing chamber, with combustion gases from the carburizing chamber. Then the charge is transferred to this carburizing chamber, and is carburized at a temperature in excess of 900.degree. C., preferably 950.degree. to 980.degree. C., for 10 to 17 hours. The charge is cooled in a third chamber of this furnace, to a temperature of 820.degree.-860.degree. C. maintained by means of combustion gas leaving the carburizing chamber. The bushes are extracted from the charge one at a time by a robot and are directly individually quenched. The ends of the bushes are tempered in an induction furnace at 550.degree.-600.degree. C. for 10 to 25 seconds, and then the bushes are emulsion cooled. The bushes are totally stress relieved for 1-2 hours at 180.degree.-200.degree. C. in a continuous furnace fed by hot waste gases from the first-mentioned furnace.

REFERENCES:
patent: 3227586 (1966-01-01), Spencer
patent: 4152177 (1979-05-01), Mantel
L. B. Efimova et al., Metal Science & Heat Treatment, vol. 21, No. 7-8, pp. 609-611, Jul.-Aug. 1979.

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