When the thickness of spur bevel gear blank is 90mm, the displacement nephogram in X direction of spur bevel gear blank with two different processing methods is shown in Figure 1. From the cloud picture, it can be seen that the straight bevel gear split wheel blank is bent and deformed downward as a whole, resulting in the compression state of the upper surface of the straight bevel gear blank and the tension state of the lower surface. Therefore, when the straight bevel gear blank is deformed in the Z direction, it will also be displaced in the X direction, and the deformation in the X direction of the straight bevel gear blank is symmetrical. It can be seen from the figure that the red part on the upper surface of the spur bevel gear blank moves along the positive x direction and the blue part moves along the negative X direction. After processing, the absolute value of the displacement in the X direction on the upper surface of the spur bevel gear blank reaches 0.052mm at most; The lower surface of the straight bevel gear blank is shown as the light blue part moving in the negative direction of X and the yellow part moving in the positive direction of X. the displacement in the X direction of the lower surface of the straight bevel gear blank is small. After processing, the absolute value of the displacement in the X direction of the lower surface reaches 0.033mm at most.
At the same time, although different processing methods will lead to different deformation of spur bevel gear blank in the processing process, the corresponding deformation methods and deformation values of the two processing methods are the same after processing.
When the thickness of the straight bevel gear blank is 85mm, the x-direction displacement nephogram of the straight bevel gear blank with two different processing methods is shown in Figure 2. From the figure, it can be seen that after changing the thickness of the straight bevel gear blank, the form of deformation in the x-direction of the split bevel gear blank has not changed compared with the previous.
Figure 1 shows that after machining, the left half of the upper surface of the spur bevel gear blank moves along the positive x direction and the right half moves along the negative X direction. After machining, the absolute value of the displacement in the X direction of the upper surface of the spur bevel gear blank reaches 0.06mm at most; The deformation of the bottom surface of the straight bevel gear blank is opposite to the upper surface of the blank. After processing, the absolute value of the displacement in the X direction of the bottom surface of the straight bevel gear blank reaches 0.032mm at most.
Through the processing results of the finite element analysis of the straight bevel gear blank with thickness of 90mm and 85mm, it can be inferred that when only the thickness of the straight bevel gear blank is changed, the deformation form of the straight bevel gear blank in the X direction will not change, but the displacement value of the straight bevel gear blank in the X direction will change.
When the thickness of the straight bevel gear blank is 80mm, the displacement nephogram in the X direction of the straight bevel gear blank with two different processing methods is shown in Figure 3. It can be seen from the figure that the maximum absolute value of the symmetrical displacement of the upper surface along the X direction of the straight bevel gear with two processing methods is 0.07mm, and the maximum absolute value of the displacement of the lower surface is 0.029mm. Therefore, it can be judged that the two processing methods lead to the same deformation in the X direction of spur bevel gear blank.
When the thickness of straight bevel gear blank is 75mm and 70mm, the displacement nephogram in X direction after the processing of straight bevel gear blank is shown in Figure 4. It can be seen from the figure that the symmetrical displacement of the upper surface of the 75mm thick spur bevel gear blank along the X direction is 0.082mm, and the symmetrical displacement of the lower surface is 0.02mm; The symmetrical displacement of the upper surface of the 70mm thick spur bevel gear blank along the X direction is 0.103mm, and the symmetrical displacement of the lower surface is 0.02mm.
Draw the absolute value of X displacement on the upper and lower surfaces of spur bevel gear blanks with different thickness into a broken line diagram, as shown in Figure 5. As can be seen from Fig. 5, when the thickness of the straight bevel gear split wheel blank gradually decreases, the displacement in the X direction of the upper surface gradually increases and the speed of displacement increase gradually increases; The displacement in the X direction of the lower surface decreases gradually with the decrease of the thickness of the straight bevel gear blank, and the displacement value of the lower surface is obviously smaller than that of the upper surface. Compared with the displacement in Z direction, the displacement in X direction of spur bevel gear blank is smaller, and the displacement in this direction is caused by the bending deformation of spur bevel gear blank.