Gear shaft heat treatment

The importance of gear shafts

The importance of gear shafts.The mill is an important piece of machinery for modern industrial production, and the gear shaft of the mill is an important transmission part of the mill, mainly subject to alternating load, impact load, shear stress and contact stress.

Requirements for gear shafts

The shaft section is prone to cracking and the teeth to wear. Therefore a certain strength and toughness is required for the heart of the gear shaft, with a high fatigue limit and resistance to multiple impacts. The surface should also have a certain degree of hardness and wear resistance. In order to meet these performance requirements, the material should have good mechanical properties, often using 42CrMo steel by normalising, tempering, induction heating quenching plus low-temperature tempering has reached the required performance.

42CrMo is a medium carbon alloy steel

42CrMo is a medium carbon alloy steel, the preparatory heat treatment is normalised, the main purpose is to obtain a certain hardness, to facilitate the cutting process of the billet, for the tempering to prepare the organization. The purpose of quenching is to improve the comprehensive mechanical properties of the mill gear shaft. Medium frequency induction heating surface quenching is to make the surface of the parts to get high hardness and wear resistance, while the heart still maintain a certain strength and high plasticity, toughness.

Through the analysis of the heat treatment process of 42CrMo steel, it is clear that the problems that need attention in the implementation of the heat treatment process. To be able to correctly determine the heating temperature, time, holding time, cooling mode, the purpose is to achieve the required performance and ensure quality through the correct heat treatment process.

Analysis of the working conditions of the gear shaft according to

Failure form and performance requirements, most of the materials selected for alloy medium carbon steel, in the design of normalizing – tempering – medium frequency induction heating quenching plus low temperature tempering heat treatment process, this design draws on the “Heat Treatment Engineer’s Manual”, “Heat Treatment Practical Data Quick Reference Manual”, “Heat Treatment of Steel”, “Steel for Machine Tool Parts”, “Metal Technology” and so on. According to the theoretical basis of the process design set a complete heat treatment process, so that the heat treatment of 42CrMo medium carbon alloy structural steel surface in addition to high hardness, high wear resistance, high fatigue strength, strength at high temperatures, but also to make the heart has high strength and toughness, so as to meet the quality requirements of the gear shaft.

Shandong Baowu Steel Group.

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