Eliminating Flow Induced Birefringence and Minimizing Thermally Induced Residual Stresses in Injection Molded Parts

残余应力是造成注塑件翘曲的主要原因。本研究的目的是开发新的技术，以消除流动引起的双折射和最小化由于冷却引起的热应力。这一目标将通过快速加热模具表面来实现，这样熔体就可以等温填充型腔，并在正常的注射成型周期内进行加工。研究结果可以消除注塑件的流动应力。反设计优化技术是一种非常有前途的技术，可以获得最优的模具表面温度的时间分布，并提供更好的残余应力知识。该项目将大大提高在成型需要绝对尺寸稳定性的高精度零件方面的应用。这些研究的结果预计将最终导致开发一种具有成本效益的生产注塑件的创新方法。

Residual stresses are the main cause of unwanted warpage observed in injection molded parts. The objective of this research is to develop new technology for eliminating flow induced birefringence and minimizing thermally induced stresses due to cooling. This objective will be accomplished by rapidly heating the mold surface so that the melt can fill the cavity isothermally and yet be processed within the normal injection molding cycle time. The outcome of this research could eliminate the flow induced stresses in injection molded parts. The inverse design optimization technique is very promising technique to obtain an optimally prescribed temporal profile of the mold surface temperature and provide better knowledge about the residual stress. This project will greatly enhance applications in molding high-precision parts requiring absolute dimensional stability. The results of these studies are expected to ultimately lead to the development of an innovative cost-effective method of producing injection molded parts.