摘要微孔注射成型技术是一种新型的注射成型技术。运用这项技术生产出的塑料制 品性能和功能具有独特的优势，同时还提高了工艺的经济性，适合投入到大规模生 产中。现在，国内外都设立了专门的实验室和研究院研究微孔注射成型技术，并在 不断地改进此项技术的不足，力求生产出功能更加完善的制品。79141

本文通过模拟实验的方法，对微孔注射成型工艺进行探索和研究。模拟实验是 基于 Moldflow 软件开展的，发泡材料选择高抗冲聚苯乙烯（HIPS），分别设置了模 具表面温度、熔体温度、发泡开始时的体积、气体初始浓度 4 个因素，并将 4 个因素设置了 3 个水平，采用正交实验的方法，制定了 L9（34）正交实验表，进行了 9 组模拟微孔注射成型实验。模拟完成后，记录气泡半径、翘曲变形、残余应力的模 拟实验数据，探究 4 个因素对这些参数的影响，找出最优工艺组合，优化工艺水平。 最后，将传统注射成型工艺与微孔注射成型工艺进行对比，探究两种工艺的优劣。

正交实验结果表明，在设置的水平范围内，采用模具表面温度 35℃、熔体温度 250℃、发泡开始时的体积 85％、气体初始浓度 0。9％进行微孔注射成型时，可以得 到翘曲小、应力轻的制品。两种工艺的对比结果表明，微孔注射成型工艺更加优越， 可以有效减少制品的翘曲和应力。

毕业论文关键词：微孔注射成型；Moldflow 模拟软件；正交实验；优化工艺参数

Abstract Microcellular Injection molding technology is a new injection molding technology。 Using this technology to produce plastic products performance and function has a unique advantage, but also improve the process economics, fit into mass production。 Now, at home and abroad are set up specialized laboratories and institutes  studies  on Microcellular Injection molding technology, and constantly improve the technology, and strive to produce more perfect product。

This paper will explore and research the technology of microcellular injection molding through the method of simulation experiment。 The simulation experiment is based on the Moldflow software, and choosing HIPS as the experimental materials。 Experiments were set up mold surface temperature, melt temperature, foaming at the beginning of volume, initial gas concentration 4 parameters and 4 parameters at 3 levels, using the orthogonal experimental method, to develop the L9(34) orthogonal experiment table, of 9 groups of simulated micro injection experiment。 After the simulation, the simulation experiment data of bubble radius, warping deformation and residual stress are recorded, and the effects of 4 factors on these parameters are optimized to find out the optimal process combination and the process level。 Finally, the traditional injection molding process and microcellular injection molding process to explore the  pros  and cons of the two processes。

Orthogonal experiment results show that in setting range, the mold surface temperature 35 DEG C, melt temperature of 250 DEG C, 85% in volume at the start of the foam, the gas concentration of 0。9% of Microcellular Injection Molding can get small warping and product of the light force。 The results of the comparison of  the  two processes show that the micro hole injection molding technology is more superior, can effectively reduce the warp and the stress of the product。

Keywords: microcellular injection molding; Moldflow   software;   orthogonal experimental; optimizing process parameters

目 录

第一章 绪论 1

1。1 微孔塑料注射成型