Through the measurement of the straight bevel gear split blank with the coordinate measuring instrument, it can be found that the included angle of the left and right end faces of the straight bevel gear blank continues to decrease during the machining process, and the included angle of the end face after machining is 0.02 ° lower than that before machining. It can be seen that the straight bevel gear blank is twisted during the machining process, resulting in opening deformation, The deformation along the width direction of the straight bevel gear blank in the machining process will also change the angle of the left and right end faces of the straight bevel gear blank. The experimental data show that the inner and outer circle diameter of the split wheel blank of spur bevel gear has been increasing during the machining process. After the machining, the inner and outer circle diameter of the split wheel blank increases by about 0.070mm. This shows that the straight bevel gear blank has a deformation of about 0.035mm along the direction of the big end of the gear (the negative direction of y-axis in Fig. 1). The experimental results are consistent with the finite element analysis results in Fig. 1.

At the same time, through the experimental measurement, it can be found that the perpendicularity tolerance of the left and right ends of the straight bevel gear blank relative to the bottom surface has been increased by a small margin during the machining process. Compared with the finite element simulation results of the straight bevel gear split blank, as shown in Figure 2, it can be seen from the figure that the upper surface of the straight bevel gear blank is in a compressed state and the lower surface is in a tensile state, resulting in a larger perpendicularity tolerance between the two ends and the bottom surface. Therefore, it can be judged that the variation trend of perpendicularity tolerance of straight bevel gear blank end face measured in the experiment is consistent with the simulation.

In addition, the experimental results show that the flatness tolerance of the upper surface relative to the bottom surface of the straight bevel gear billet also increases continuously in the machining process, and the flatness tolerance of the straight bevel gear billet is much greater than the perpendicularity tolerance. Through the measured spatial coordinates, it can also be found that the deformation of the straight bevel gear blank along the thickness direction is large. Compare the measured deformation of the straight bevel gear blank in the thickness direction with the finite element simulation results, as shown in Figure 3. It can be seen from the figure that after machining, the simulation and experimental results show that the maximum deformation of straight bevel gear blank occurs in the middle of the blank, and the deformation measured in the experiment is slightly smaller than the simulation results. For the maximum deformation of straight bevel gear blank in the middle, the relative error between simulation and experiment is about 3.6%, which shows that the theoretical model and simulation results are correct.