Machining method of gear parts of gearbox

Abstract

The invention discloses a machining method of gear parts of a gearbox. The machining method is characterized by comprising the following steps that (1) the material 20CrMnTi is selected; (2) furnace charging and heating are conducted; (3) forging is conducted; (4) shot blasting is conducted for the first time; (5) rough machining is conducted; (6) normalizing is conducted; (7) gear hobbing is conducted; (8) gear shaving is conducted; (9) deburring and cleaning are conducted; (10) carburizing and quenching are conducted; (11) tempering is conducted; (12) shot blasting is conducted for the second time; (13) an inner hole is ground; and (14) rust protection, checking, packaging and storage are conducted sequentially. According to the machining method of the gear parts of the gearbox, the surface hardness is 58-62 HRC after carburizing and quenching and low-temperature tempering are conducted, the hardness of the core is 35-42 HRC, and the machinability of the 20CrMnTi is improved through normalizing after forging; in addition, cooling and quenching can be conducted directly after carburizing, the carburizing speed is high, transition layers are uniform, the deformation amount is small after carburizing, and the advantages of being capable of bearing high-speed moderate load and impact, resistant to friction and the like are achieved.

Description

technical field [0001] The invention belongs to a heat treatment process, in particular to a processing method for gearbox gear parts. Background technique [0002] In the prior art, a gearbox gear is made of 20CrMnTi, which is a kind of carburizing steel, and carburizing steel is usually low-carbon steel with a carbon content of 0.17% to 0.24% because of its high hardenability , in the case of guaranteed hardening, it has high strength and toughness, especially high low temperature impact toughness, so it is often used in the processing of automobiles to manufacture gearbox gear parts, but in the process of processing, the process control is not good Well, there will be cracks on the surface after carburizing, insufficient hardness in the core, uneven infiltration layer, and deformation defects after quenching. In order to solve the above problems, there is a need for a processing method for gearbox gear parts, so that the hardness of the tooth surface and the hardness of ...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, a gearbox gear is made of 20CrMnTi, which is a kind of carburizing steel, and carburizing steel is usually low-carbon steel with a carbon content of 0.17% to 0.24% because of its high hardenability , in the case of guaranteed hardening, it has high strength and toughness, especially high low temperature impact toughness, so it is often used in the processing of automobiles to manufacture gearbox gear parts, but in the process of processing, the process control is not good Well, there will be cracks on the surface after carburizing, insufficient hardness in the core, uneven infiltration layer, and deformation defects after quenching