Heat treatment technology is a traditional method to improve the surface strength of materials. The heat treatment of gear material is an indispensable key technology to give full play to the material characteristics and improve its surface performance. Correct and appropriate heat treatment can improve the surface characteristics of...
In the process of heat treatment, with the changes of temperature and microstructure, parts will produce thermal stress and microstructure stress. From the mechanical point of view, when the internal stress is greater than the plastic limit at the corresponding temperature, the material will have plastic distortion, which is...
Take 300 points at the axis of the gear shaft for analysis. The path taken is shown in figure (a). Comparing the distortion of direct carburization and carburization after preheating at 400 ℃ for 3 hours (Figure (a)), it can be seen that the distortion trend of the gear...
1. Finite element model According to the geometric diagram in Figure 1, the three-dimensional software is used for modeling, as shown in Figure 2 (a). Considering the longitudinal symmetry characteristics of the gear shaft, 1 / 14 of the gear shaft is taken for modeling, and the automatic meshing...
Forging blank is the first link in the processing and manufacturing of large helical gears. The main work is to forge raw materials into blanks that can be made into helical gears. There are three main blank making methods, namely: 1) Directly use round steel as blank (rarely used,...
Heat treatment is not only a heating and cooling process of workpiece, but also a process of stress generation and release. The theory of heat treatment proves that the shape of the workpiece surface has a great influence on the defects caused by heat treatment. Before heat treatment, the...
The research on heat treatment deformation control of heavy truck gearbox gear is of great practical significance and great practical value. (1) The material selection of the gear box of heavy-duty truck requires the hardenability to ensure that the tooth surface and center of the truck gear get the...
At present, foreign automobile manufacturers generally adopt isothermal annealing treatment for truck gear forging blank, and specify different isothermal annealing processes for different materials. For example, Volkswagen adopts isothermal annealing treatment of deformation waste heat, i.e. by treatment, and the forging blank of higher alloy truck gear is treated...
As we all know, the quality of gears is influenced not only by the steel itself, but also by the heat treatment process to a great extent. The heat treatment process mentioned here not only refers to the carburizing and quenching process of gear, but also includes the heat...
The heat treatment strengthening technology of automobile gears should pay attention to the control of surface integrity, that is, to control the microstructure, depth, core hardness, residual stress and so on. Improper heat treatment control of automobile gears can easily lead to excessive grain boundary oxide layer structure, decarburization,...