Transactions of Materials and Heat Treatment

Title：Numerical simulation of thixotropic extrusion casting for cast iron crankshaft in compressor of air condition

Authors： Zhang Chenyang Zhao Shengdun Wang Yongfei Han Xiaolan

Unit： Xi′an Jiaotong University

KeyWords： compressor crankshaft semi-solid cast iron squeeze casting numerical simulation

ClassificationCode：TG376

year,vol(issue):pagenumber：2014,39(12):137-146

Abstract：

Based on PLCO viscosity model, a 3D numerical simulation model of cast iron crankshaft in the compressor of air condition manufactured by semi-solid squeeze casting process was established by Procast software. Reasonable process parameters were obtained, namely the casting temperature of 1165～1185 ℃ for billet, the preheating temperature of 300～400 ℃ for die, the filling speed of 0.05～0.25 m·s-1 for punch. The results show that the cavity cannot be completely filled when the pouring temperature is too low or the punch speed is too slow. When the punch velocity is too high, and turbulence occurs during the mould filling, air will entrap easily. The solidification time of the casting increases with the rising of die preheating temperature, but extreme high pouring temperature and mould temperature can cause shrinkage porosity defect in the casting process. A comparative analysis between the semi-solid squeeze casting process and the liquid squeeze casting process shows that the former can avoid the defects caused by the latter such as serious entrapped air, non-sequence filling and big hot spot.

Funds：

国家自然科学基金资助项目（51335009）；国家04重大科技专项（2011ZX04016-081）；陕西省自然科学基础研究计划资助项目（2012JQ7032 ）

张晨阳（1987-），男，博士研究生

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