| 摘要 |
PURPOSE: A method for heat treating a roller for a rotary compressor is provided to reduce manufacturing cost and improve quality of the roller by settling defects due to generation of cracks. CONSTITUTION: The method comprises the processes of preheating a roller manufactured of Mo-Ni-Cr cast iron consisting of 3.3 wt.% of C, 2.1 wt.% of Si, 0.65 wt.% of Mn, 0.3 wt.% of Ni and 0.6 wt.% of Cr and continuous casting cast iron consisting of 3.45 wt.% of C, 2.7 wt.% of Si, 0.68 wt.% of Mn, 0.39 wt.% of Cu, 0.1 wt.% of Cr and 0.11 wt.% of Mo at the temperature of 900 deg.C for 30 minutes; heating the roller under the environment that is maintained with a carbon potential of 1.3 wt.% for 90 minutes and quenching the heated roller to an oil coolant of 50 deg.C; washing the quenched roller in an alkali cleaning agent in which the temperature of 80 deg.C is maintained for 30 minutes; and manufacturing a roller having a strength of HRC 52 by tempering the seasoned roller at the temperature of 250 deg.C for 2 hours after seasoning the washed roll by leaving it alone in the air for 4 hours.
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