# Mechanical properties of roller supported horizontal centrifugal casting machine and innovation of its influence on wall thickness of furnace tube

The main innovations are as follows:

(1) Through mechanical analysis, the calculation model of support stiffness and damping of roller support in horizontal centrifugal casting machine with roller support was established. Combined with vibration theory, the dynamic model of mold rotor of centrifugal casting machine was established. Combined with the transfer matrix method, the natural vibration of the cast rotor and the unbalance response caused by random mass eccentricity are studied systematically.

(2) Through geometric analysis, the real surface profile equation of the mold and the roller is described by mathematical equation. The calculation method of the real contact point between the mold and the supporting roller is established when considering the surface error or surface morphology of the mold and the roller, and then the excitation to the mold rotor is obtained. This excitation is introduced into the dynamic model, and the influence of the shape error of the roller and mold surface and the surface morphology on the vibration performance of the mold rotor is obtained.

(3) Based on the calculation formula of stiffness and damping of rectangular foundation embedded by Pais, and combined with vibration theory, the transfer matrix method for solving the dynamic mechanical properties of centrifugal casting furnace tube considering the vibration of foundation is derived. By using this method, the dynamic properties of cast rotor considering the characteristics of block foundation and foundation can be solved. The size and ground of machine foundation are studied by an example The effect of basic characteristics on the vibration performance of centrifugal casting mold.

(4) Based on the vibration theory and the knowledge of fluid mechanics and heat transfer, the dynamic model of centrifugal casting was modified, and the coupling model of molten steel flow mold vibration molten steel cooling for horizontal centrifugal casting was established. Combined with the transfer matrix method, the numerical example was studied, and the mold vibration, molten steel flow and temperature field in the mold at each time were calculated The mutual influence law between them is discussed, and the prediction of the final wall thickness deviation of furnace tube is realized.

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