Quenching process for bearing steel shaft pin parts

Abstract

The invention relates to a quenching process for bearing steel shaft pin parts. As a blank, bearing steel is machined into shaft pin parts, the quenching process comprises the following steps: (1) checking whether the spheroidizing annealed structure of the parts is qualified, if yes, performing the step (2); (2) putting the parts in a heating furnace, and controlling the heating temperature to be 875-885DEG C, carbon potential to be 0.6-0.7%, and heating time to be 40-50min; (3) enabling the parts to fall in an oil tank for quenching at the quenching oil temperature of 60-80DEG C, wherein the quenching cooling time is 5-10min; and (4) tempering, wherein when the hardness of the parts is required for 61-65HRC, the tempering temperature is at 165-185DEG C, and the tempering time is 2.5-3h, and when the hardness of the parts is required for 58-62HRC, the tempering temperature is at 200-215DEG C, and the tempering time is 2.5-3h. By strictly controlling the spheroidizing annealed structure of the parts and changing the heating temperature, furnace carbon potential Cp and other thermal treatment technological parameters, the time per hour is shortened by 10-15min compared with the conventional treatment time, and on the premise that guaranteeing the quality index of quenching thermal treatment is guaranteed, the purposes of obviously improving the equipment productivity, and decreasing the production energy consumption can be achieved.

Description

technical field [0001] The invention relates to a quenching process for bearing steel shaft pin parts. Background technique [0002] Bearing steel is widely used as the blank for the production of shaft pin parts because of its high hardness, good wear resistance and high contact fatigue performance after quenching and tempering. When the production enterprise quenches the bearing steel pin shaft parts, considering the requirements of the customer on the metallographic structure level, deformation and hardness of the parts after quenching, and determining the heat treatment process parameters such as heating temperature and holding time, usually choose Within the range recommended in the relevant heat treatment manual. With the rapid improvement of the control precision of heat treatment processing equipment, the gradual improvement of material manufacturing level and the continuous improvement of heat treatment process, there are problems of high energy consumption and low...

AI Technical Summary

Problems solved by technology

With the rapid improvement of the control precision of heat treatment processing equipment, the gradual improvement of material manufacturing level and the continuous improvement of heat treatment process, processing and production according to conventional processes has the problems of high production energy consumption and low production efficiency.

Images