多流体多次注射成型过程中一维温度场的研究

One-dimensional Temperature Analysis of Multi-fluid Multiple Injection Process

采用数学模拟结合实验验证的方法,对高密度聚乙烯(PE-HD)多次注射成型过程的一维温度场进行了计算和分析。并对模型进行合理简化,皮、芯层材料采用不同初始条件,用MATLAB软件对冷却过程中的温度分布进行数值模拟,将计算结果与实验值进行比较分析。结果表明,在芯层熔体充填过程中的黏性耗散可忽略不计;在熔体冷却阶段模拟值和实验值吻合较好,在固相冷却段由于聚合物的大分子特性和材料的收缩性,实验值高于模拟值;模拟值的计算对高分子材料加工具有重要的指导作用。

Using numerical simulation and experiment method, one-dimensional temperature profile of high density polyethylene （PE-HD） in multiple injection molding process was calculated and analyzed by MATLAB software. With the model suitably simplified, using different initial conditions for the skin and core materials, the simulated temperature distribution in the cooling process was compared with that obtained by experiment. It proved that the viscous dissipation in the filling process of the skin melt was negligible. The numerical and experimental values were in good agreement in the melt cooling stage. However, due to shrinkage, in the solid state of cooling section, the experimental value was higher than that of simulation.