Production process facilitating optimization of gear surface quality and segregation degree

Abstract

The invention discloses a production process facilitating optimization of gear surface quality and the segregation degree. The production process includes the steps of blank casting, cutting, heat treatment, finishing cutting and ground finish, wherein blank casting, cutting, heat treatment, finishing cutting and ground finish are sequentially conducted. Bars are made of 20CrMnTiH. The heat treatment step includes the procedures that a cut blank is heated, carburized and then slowly cooled to the temperature not higher than 550 DEG C, secondarily heated, quenched after heat is preserved for not less than 2 h, heated to the temperature ranging from 170 DEG C to 200 DEG C for the third time and tempered after heat is preserved for not less than 3 h, wherein the blank is secondarily heated to the temperature ranging from 840 DEG C to 870 DEG C, the carburization procedure includes the preheating stage, the strong carburization stage and the diffusion stage, wherein the preheating stage, the strong carburization stage and the diffusion stage are sequentially conducted. The production process is simple in steps, product ingredients are even, and gears with surface hardened layers not prone to being disengaged and with the proper impact resistance, abrasion resistance and strength can be conveniently obtained.

Description

technical field [0001] The invention relates to a manufacturing process of transmission parts for torque transmission, in particular to a production process for optimizing the surface quality and segregation of gears. Background technique [0002] Gears are key components in mechanical equipment, and the quality of gears is directly related to the service life of the entire equipment. The quality of the gear depends largely on the gear material and its heat treatment process. Therefore, manufacturers related to gear manufacturing both at home and abroad attach great importance to the research and development of gear materials and heat treatment technology. [0003] The material selection of gears in the prior art is generally based on the force and working environment of the gear in the transmission system. The heat treatment process is a means to ensure that the thickness of the gear surface hardening layer, the hardness of the gear surface and core, and the corrosion resi...

AI Technical Summary

Problems solved by technology

In the prior art, the product obtained by heat treatment for gears made of 20CrMnTiH has a higher martensitic metallographic grade, and the gears obtained in this way are prone to work hardening under the action of external force during use, resulting in surface cracking of the gears in a relatively short period of time. Layer detachment seriously affects the stability and service life of gear transmission. Although the gear blank obtained by casting slabs is efficient, the difference in C content between the rack and the tooth surface is large, which affects the further improvement of the gear life.