Thermal processing method for spiral bevel gear

Abstract

The invention discloses a thermal processing method for a spiral bevel gear. The method comprises the steps of basket loading operation, cleaning treatment before furnace charging, carburizing treatment, isothermal quenching treatment, cleaning treatment after quenching, tempering treatment, air cooling treatment, and the like. According to the thermal processing method for a spiral bevel gear, the carburizing treatment adopts a heating manner of step temperature rising and temperature preserving, therefore, temperature differences of respective parts of the spiral bevel gear can be reduced, generation of a machining stress is eliminated, and deformation of the spiral bevel gear caused by too fast heating is reduced; since the isothermal quenching treatment is adopted after the carburizing treatment, a constant oil pool temperature ensures uniform cooling of the spiral bevel gear, deformation of the spiral bevel gear is reduced, the thermal processing deformation of the spiral bevel gear is reduced, and a higher thermal processing finished product rate of the spiral bevel gear is ensured.

Description

technical field [0001] The invention relates to a heat treatment method for gears, in particular to a heat treatment method for spiral bevel gears, and belongs to the technical field of gear manufacturing. Background technique [0002] Gear transmission is the most widely used form of transmission in mechanical transmission. Because of its characteristics of accurate transmission ratio, high efficiency, compact structure, reliable operation and long life, it is widely used in modern machine tools and instruments. [0003] As the basic element of gear transmission, the gear is a mechanical element with teeth on the rim that can continuously mesh to transmit motion and power. Among them, the spur gear has the best structure and manufacturability and is the easiest to process. Any tooth shape processing method can be used. The wheel part is processed, and for the spiral bevel gear (that is, the spiral bevel gear), because its teeth are distributed on the surface of a cone, and ...

AI Technical Summary

Problems solved by technology

[0005] The existing spiral bevel gear manufacturing methods usually include blanking, forging, lathe rough turning, pre-heat treatment, finish turning, gear milling, post heat treatment, gear grinding and other processes. The post heat treatment process is to make the spiral bevel gear have The key process of excellent wear resistance, high resistance to contact fatigue and bending fatigue and long life. At present, the conventional method of post-heat treatment of spiral bevel gears is to use carburizing, quenching and tempering in the mesh belt furnace production line. This traditional The method has the problem that the temperature difference between the various parts of the spiral bevel gear changes greatly, which in turn causes the defect of the processed spiral bevel gear to have a large amount of deformation, resulting in a low yield after heat treatment