Injection molding is a very popular processing technology of polymeric materials. In the conventional injection molding, the low constant temperature of the mold is used for efficient heat removal. However, low mold temperature is not feasible for thin-walled and micro-featured parts. For these kinds of parts the RHCM (rapid heat cycle molding) technologies were developed, where the temperature of the mold is increased to above transition temperature of the polymer before the filling phase starts.

In this paper, the influence of processing parameters and part thickness on maximum flow length was investigated with numerical simulations for thin-walled geometry manufactured with RHCM technology. Obtained results showed strongly nonlinear relations between maximum flow length, part thickness, and volumetric flow rate, whereas the relation between flow length, injection pressure, and cavity surface temperature was linear. Surprisingly, the cavity surface temperature had the smallest influence on maximum flow length, which may result from the velocity flow rate high enough to prevent the part from excessive solidification befor the maximum injection pressure is reached.

注射成型是聚合物材料非常流行的加工技术。在常规的注射成型中，模具的低恒定温度用于有效的散热。但是，低模具温度对薄壁和微特征零件不可行。对于此类零件，开发了RHCM（快速热循环成型）技术，其中，在填充阶段开始之前，将模具的温度提高到聚合物的转变温度以上。

在本文中，通过数值模拟研究了用RHCM技术制造的薄壁几何形状的工艺参数和零件厚度对最大流动长度的影响。获得的结果显示最大流量，零件厚度和体积流量之间存在很强的非线性关系，而流量，注射压力和型腔表面温度之间的关系则是线性的。出乎意料的是，模腔表面温度对最大流动长度的影响最小，这可能是由于流速达到足够高以防止零件在达到最大注射压力之前过度凝固而导致的。