The traditional carburizing process is to directly heat the workpiece to the carburizing temperature during carburizing. In this paper, the gear shaft is preheated for a period of time before carburizing. The gear shaft is carburized and quenched according to the two pretreatment methods in the table, and the...
In production, the preheating temperature and time parameters of gear shaft are more based on the experience of workers. Based on practical experience, several groups of preheating process parameters of gear shaft are determined, as shown in the table. The radial distortion of each process is shown in Figure...
If the distortion of gear shaft is too large, the machining accuracy and assembly accuracy will be reduced and the manufacturing cost will be increased. The radial distortion from the gear shaft axis to the gear teeth will reduce its bearing capacity, the wear resistance of gear meshing will...
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...
Carburizing process is an unsteady process, which conforms to Fick’s second law: Where: t is the carburizing time, s; C is carbon content, kg / m3; Xi is the distance of carbon atoms in the diffusion direction, m; D is the diffusion coefficient, m2 / s, which is generally...
In order to ensure the machining accuracy of involute profile of gear shaft, milling must be carried out in strict accordance with the machining process. 1) After the gear shaft blank is processed, the fitter shall mark the number of teeth according to the drawing for indexing, and draw...
In order to reduce the dimensional error caused by the cutting tool, carry out multiple trial cuts before finishing, master the error between the theoretical value and the actual value of the cutting depth, and measure the size of the machined part for many times in the intermediate process,...
The machining method of gear shaft tooth profile with modulus of 65mm is not exactly the same as that of profiling method. It is a special form of profiling method for machining gear tooth profile. If the overall tooth profile template and the overall finger milling cutter are designed...