Carburizing and quenching process for thin-wall gear

Abstract

The invention belongs to the technical field of metal material heat treatment, and particularly relates to a carburizing and quenching process of a thin-wall gear. The process comprises the following steps: low-temperature tempering and air cooling treatment is performed on the thin-wall gear after gear shaping; the thin-wall gear is subjected to pre-oxidation treatment, the temperature ranges from 400 DEG C to 500 DEG C, and the time ranges from 1 h to 2 h; carburizing treatment is conducted on the thin-wall gear; the thin-wall gear is heated to 900-930 DEG C in stages; strong carburizing treatment is conducted on the heated thin-wall gear for 3-5 h under the conditions that the temperature ranges from 900 DEG C to 930 DEG C and the carbon potential ranges from 1.0% to 1.2%; diffusion treatment is performed for 1 to 2 hours at the temperature of 900 to 930 DEG C and the carbon potential of 0.7 to 0.9 percent; the temperature is reduced to 800 DEG C to 850 DEG C under the condition that the carbon potential is 0.7% to 0.9%; temperature equalization treatment is performed under the conditions that the carbon potential is 0.7-0.9% and the temperature is 800-850 DEG C; the thin-wall gear is subjected to staged oil quenching cooling treatment; and after cooling of the thin-wall gear is finished, oil draining, cleaning, low-temperature tempering and air cooling are sequentially conducted, and carburizing and quenching are completed. The carburizing and quenching deformation of the thin-wall gear can be controlled, and it can be ensured that the heat treatment performance and the structure are not out of tolerance.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular relates to a carburizing and quenching process for thin-walled gears. Background technique [0002] At present, the carburizing and quenching process technology for heat treatment of gear parts is relatively mature, and most gear carburizing and quenching processes do not have technical bottlenecks, but for thin-walled gears, it is necessary to ensure that the surface hardness, effective hardened layer, core hardness and carburized layer structure meet the requirements , but also to control quenching and cooling deformation; the process is difficult. The thin-walled gears after the existing carburizing and quenching process generally have large elliptical deformation and warping deformation, and the deformation problem cannot be solved by leaving the amount of heat before heating and then processing, resulting in a high scrap rate of such gears. There ...

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Problems solved by technology

[0002] At present, the carburizing and quenching process technology for heat treatment of gear parts is relatively mature, and most gear carburizing and quenching processes do not have technical bottlenecks, but for thin-walled gears, it is necessary to ensure that the surface hardness, effective hardened layer, core hardness and carburized layer structure meet the requirements , but also to control the quenching and cooling deformation; the process is difficult

Thin-walled gears after the existing carburizing and quenching process generally have large elliptical deformation and warping deformation, and the deformation problem cannot be solved by leaving heat before heating and then processing, resulting in a high scrap rate of such gears

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