In the quenching process of automotive transmission, the control of temperature, stress and thermal deformation has always been a difficult problem in the industry, and the thermal deformation in the process of gear quenching is mainly caused by the thermal stress caused by uneven cooling. In order to improve the strength, toughness and reliability of mechanical parts, at present, most of the parts are treated by surface treatment and heat treatment, and the surface hardening treatment is generally carried out by quenching.
The quenching process of gear has been studied by scholars at home and abroad. Song Ke and others used ANSYS software to simulate the surface quenching of a, and obtained the results of temperature field, thermal stress and thermal deformation during the quenching process of spur gear. Zhang Jinzhou et al. Simulated the quenching process of a cylindrical gear, and obtained the conclusion that the temperature of the tooth center of the cylindrical gear is the highest, the temperature of the tooth top is the lowest, and the stress is mainly concentrated in the root of the tooth.
Wang Xin summarized the defects of traditional quenching process, combined with computer simulation technology, put forward the numerical simulation of gear carburizing and quenching process as the development direction of the current industry. In this paper, a transmission helical gear as the research object, using SolidWorks software to establish a three-dimensional model of helical gear, which is imported into ANSYS software for quenching numerical simulation analysis. This paper studies the temperature field, thermal stress and thermal deformation of transmission helical gear, and analyzes the quenching process and quenching performance of 20CrMnTi helical gear, which can provide reference for the subsequent hot working process of this kind of gear.