Carburizing direct quenching process for large-scale wind power gear/gear shaft

Abstract

The invention relates to a carburizing direct quenching process for a large-scale wind power gear / gear shaft. The process comprises the following steps of: (1) carburizing at the temperature of between 910 and 970 DEG C for 8 to 72 hours, wherein C1 is 0.9 to 1.2 percent C; (2) diffusing at the temperature of between 910 and 970 DEG C for 2 to 8 hours, wherein C2 is 0.65 to 0.9 percent C; (3) keeping temperature at low temperature of between 620 and 700 DEG C for 2 to 8 hours; (4) keeping the temperature at the temperature of between 810 and 850 DEG C for 2 to 8 hours before oil extraction; (5) performing the oil extraction, namely moving workpieces from a carburizing furnace to a quenching furnace for quenching; and (6) tempering in a tempering furnace at the temperature of between 150 and 200 DEG C for 4 to 48 hours. In the carburizing direct quenching process for the large-scale wind power gear / gear shaft, a process of direct tapping and quenching after carburizing is adopted, the intermediate temperature heat-preserving phase after the carburizing is added, the time of the process is reduced by about one third, the cost is reduced by about one half, the length of martensite of the workpieces can be reduced, and the number of residual austenite can be reduced obviously.

Description

technical field [0001] The invention relates to the technical field of large-scale gearbox production of wind power equipment, in particular to a carburizing direct quenching process of large wind power gears / pinion shafts. Background technique [0002] At present, there are many types of carburizing processes for large gears / pinion shafts, and the process flow is complicated. For example, the carburizing process of traditional large gears / pinions mostly needs to go through steps such as strong infiltration, diffusion, slow cooling, oil quenching, and tempering, that is: after carburizing, it is slowly cooled to room temperature, and then heated to the quenching temperature to be quenched. Some also increase the normalizing sequence before quenching. It can be seen that the route of the traditional carburizing process is very complicated, which requires long hours of equipment and high cost, and cannot meet the needs of large-scale and high-efficiency production. Contents...

AI Technical Summary

Problems solved by technology

It can be seen that the route of the traditional carburizing process is very complicated, which requires long hours of equipment and high cost, and cannot meet the needs of large-scale and high-efficiency production.

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