Construction of mold dynamic model of centrifugal casting machine and comparison of performance test results and theoretical results

In the theoretical calculation, the theoretical model is still consistent with the model described, but in the programming calculation, some parameters need to be modified according to the situation of the test device, including the size of the model, the type of bearing, the elastic modulus of plexiglass material, the rotor speed, etc. For the theoretical calculation of the testing machine, the model of the rolling bearing is 6203, which is a deep groove ball bearing. The calculation method of its stiffness and the dimensions of the testing machine are shown in table 2.5. The density of plexiglass is 1.18g/cm3, the elastic modulus is 2gpa, the Poisson’s ratio is 0.5, and the elastic modulus of rubber is 3Mpa, the Poisson’s ratio is 0.4.

According to the test steps, the variation law of vibration with speed is obtained after data processing. The figure shows the comparison between the test results and the theoretical results. It can be seen that the vibration of each point increases with the increase of the rotating speed, which is consistent with the numerical change trend of the theoretical calculation, but the vibration of the experimental results is larger than the theoretical results. This is because there are more factors that affect the vibration in the test than the theoretical calculation, such as the smoothness of the test bench, the machining accuracy of the test equipment, especially the experimental results Because the supporting roller is wrapped with a layer of rubber (because the mold is made of plexiglass with low strength and can not bear the vibration impact), the actual vibration is too large. However, it can be seen that the trend and order of magnitude of the change are still consistent with the theoretical calculation,