# Effect of coupling of molten steel flow and mold vibration on wall thickness of furnace tube in centrifugal casting

Since the emergence of centrifugal casting technology, many scholars at home and abroad have studied the centrifugal casting process. At present, most of the research on centrifugal casting process is carried out by CFD software, but when centrifugal casting is used to produce industrial cracking furnace tubes, because the radial and axial dimensions of the mold are relatively large, the centrifugal casting machine will vibrate in the process of operation, and the vibration of the mold and the flow of molten steel are coupled with each other, and the vibration form can not be predicted Some CFD software is difficult to include the influence of vibration in the model. Therefore, this chapter establishes the coupling model of molten steel flow and mold vibration in horizontal centrifugal casting through mechanical analysis, and constructs the coupling algorithm of molten steel flow and mold vibration, which can simultaneously calculate the amount of mold vibration and the flow of molten steel at each time. Through the study of an example, the influence of the coupling of molten steel flow and mold vibration on the wall thickness of centrifugal casting furnace tube is explained.

(1) In the process of horizontal centrifugal casting, the vibration of the mold is coupled with the flow of liquid metal in the mold. Taking the centrifugal casting of furnace tube as the research object, the coupling relationship between mold vibration and liquid metal flow was deduced through force analysis, and the coupling model of molten steel flow mold vibration was established during centrifugal casting of furnace tube. According to the model in this paper, the transient transfer matrix method was used to solve the model by MATLAB programming, and the results of centrifugal casting at each time were obtained The influence of the coupling between the molten steel flow and the mold vibration on the wall thickness of the furnace tube in centrifugal casting is illustrated.

(2) The mass eccentricity of centrifugal casting mold is considered as constant value and random distribution. The results of the two examples show that the flow of molten steel and the vibration of the mold are influenced by each other. After the molten steel is poured into the mold, the vibration performance of the whole system is affected: after the molten steel is poured into the mold, the vibration of the mold will be intensified, and the amplitude will increase with the increase of the amount of steel poured; while the resonance speed will decrease slightly with the increase of the amount of steel poured, which is due to the increase of the overall mass of the rotor after the molten steel is poured into the mold.

(3) After considering the influence of mold vibration, the wall thickness of furnace tube is uneven, which is related to the eccentricity of centrifugal casting mold and the amount of steel poured in: the greater the eccentricity of mold, the greater the difference between the maximum wall thickness and the minimum wall thickness, the more serious the wall thickness unevenness of furnace tube; the greater the amount of steel poured in, the more serious the wall thickness unevenness of furnace tube.

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