(1. 中南大學(xué) 數(shù)學(xué)科學(xué)與計算技術(shù)學(xué)院，長沙 410075；
2. 中南大學(xué) 粉末冶金研究院，長沙 410083)
摘 要: 對粉末共注射充模流動過程進行數(shù)值分析和實驗驗證。采用實驗和數(shù)值擬合的方法確定芯/殼層界面的厚度，并運用改進的控制體積法對芯、殼層喂料前沿進行追蹤。采用有限元和有限差分法對控制方程組進行數(shù)值求解，用Matlab進行程序開發(fā)，獲得芯、殼層充模過程中的熔體前沿分布以及溫度場和壓力場的分布情況。將模擬結(jié)果與實驗結(jié)果進行對比分析，發(fā)現(xiàn)在充填初期，模擬的喂料前沿位置與實驗較為吻合，但隨著充填的進行，兩者偏差增大，其原因可能是在模擬過程中沒有考慮注射坯的收縮。
關(guān)鍵字: 粉末共注射成形；數(shù)值模擬；控制體積法；充模流動
（1. School of Mathematical Science and Computing Technology, Central South University, Changsha 410075, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The powder co-injection molding filling process was analyzed and verified by the theory of numerical analysis and experiments. The thickness of core/shell interface was determined by experiments and numerical fitting. The melt front was traced by a modified control volume. The pressure equation and energy equation were solved by hybrid finite element/finite difference approaches. The simulation program was developed by means of Matlab, as a result the tracking of movement of skin front and core/skin interface and profile of temperature and pressure fields were obtained. Finally, simulation results were compared with the experimental ones. The simulated results agree well with the movement of feed’s forefront. With the filling of the feed, the deviation between simulation results and the test results increases. The reason may be that the contraction of injected parts is ignored in the process of numerical simulation.
Key words: powder co-injection molding; numerical simulation; control volume method; filling flow
