Construction and research of mold dynamics model for centrifugal casting machine

Because of the eccentric mass distribution, the error of the outer circle of the mold, the error of the outer circle of the driving roller and the uneven initial distribution of the molten steel in the mold, the mold will vibrate when the centrifugal casting machine is working. Centrifugal casting machine can be regarded as a rotor system consisting of two sets of rollers supporting a hollow shaft (mold).

Because the mold is a rotor with distributed mass, the position and orientation of the center of mass deviation of each section along the length direction are changing, so it is very difficult to accurately calculate the vibration performance of the mold. In addition, the stiffness and damping properties of the supporting roller are also important factors affecting the vibration performance of the mold, and it is very difficult to establish the calculation method of the stiffness coefficient and damping coefficient of the roller.

Taking the roller horizontal centrifugal casting machine as the research object, based on the analysis of its working principle, the bearing force of the roller support is analyzed, the stiffness and damping model of the roller support is established, and a vibration model which can calculate the vibration performance of the roller horizontal centrifugal casting machine is established by applying the relevant vibration theory The critical speed and unbalance response are calculated and analyzed by matrix method, and the results are discussed.

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