Numerical simulation of sand casting

In China, the development of sand casting simulation technology is relatively late in China, but through the support of the state, the joint research of colleges, enterprises and research institutes, and the research results of foreign scholars, the sand casting simulation technology has also developed rapidly.

Shenyang Foundry Research Institute simulated the influence of temperature change on steel castings during sand casting solidification, studied the casting process scheme of large steel castings, and studied the filling of free surface jointly with Tsinghua University; Harbin Institute of technology first studied the solute distribution during alloy solidification; The macro segregation of sand castings during solidification was studied in Northwest University of technology.

With the development of numerical simulation technology, more and more scholars in China began to study the simulation technology of sand casting. According to the mechanical properties of materials, Cheng Jun and others developed a stress field analysis system to simulate the thermal stress in the process of sand casting. The results show that it is consistent with the actual data; Li Baozhi and others optimized the casting process of exhaust valve shell, and solved the problem of leakage of sand casting and local sand inclusion; Wang Ziyan et al. Simulated the filling and solidification process of lost foam casting of aluminum alloy cylinder block, obtained the conclusion that the influence degree of defects from small to large is negative pressure, pouring temperature and pattern density, and optimized the process scheme; Tang Yong et al. Explored a new method to simulate the formation of microstructure in the process of metal solidification. It is concluded that CET is caused by the change of undercooling in the growth of dendrite front, and the simulation results are consistent with the experimental results; Wang Jun et al. Used the finite difference method to simulate and study the dendrite growth during solidification; Yan Weidong et al. Simulated the formation of grain structure in the solidification process of aluminum alloy and superalloy sand castings, and calculated the characteristic value of grain structure in the solidification process of K469 superalloy blade under the traditional investment casting process and the optimized fine grain casting process.

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