Precision gear processing can be divided into industrial machinery gears, bevel gears, helical gears, etc. In the process of metal gear deformation, the friction coefficient has an influence on the deformation resistance of the material, and is a physical parameter related to the sample structure, lubrication and other conditions. During deformation, the friction coefficient varies with the boundary conditions.

In order to determine the friction coefficient in the deformation process, the friction coefficient of different samples in the process of precision gear processing and production was calibrated. The specific analysis methods are as follows: By drawing the calibration curve of the friction coefficient by yourself, get the value of a certain deformation moment. The friction coefficient is incorporated into the corresponding equivalent stress and equivalent strain capacity calculation formulas, and the flow stress-strain relationship considering the friction effect is obtained. Considering the influence of friction, the stress-strain curve is closer to the actual use in life.

The instantaneous outer diameter and height of the specimen were recorded by thermal simulation experiments. According to the principle of constant plastic deformation volume, the inner diameter of the sample is calculated, and according to the formula and the modified friction coefficient curve, the friction coefficient at a certain moment under different deformation conditions is calculated. The results show that when the sample is heated to 880 °C and then cooled to the selected temperature range at a certain cooling rate, the temperature has little effect on the friction. Under the same strain condition, with the increase of carbon content, the overall variation trend of friction coefficient increases slightly, but the increase is not large. The effect of strain on the friction coefficient is more obvious.