PP高分子板材渐进成形实验研究

摘要

Traditional polymer processing techniques are only suitable for mass production.To meet the requirements of low production,it needs developing flexible polymer processing techniques.This paper researches on NC incremental forming technology of the polymer sheet,it is of great significance for its popularization and application and is used to provide a flexible machining method for high-quality production of polymer materials.It also introduces the experiments of polypropylene sheet incremental forming.The wall thickness of the forming part is measured and its density is tested.The result shows that its actual thickness is obviously larger than the theoretical value,and its density is reduced.Moreover,many pores exist in the material microstructure and the volume of PP sheet is expanded during the processing,so its thickness variation does not conform to the cosine law.%传统聚合物加工技术只适用于大批量生产,为了满足小批量的产品需求,聚合物的柔性制造已成为新的发展趋势.对聚合物板料的数控渐进成形技术进行探究,不但对渐进成形技术的推广应用具有重大意义,而且可以为聚合物材料的高质量生产提供一种柔性加工方法.该实验基于聚丙烯(PP)板料进行渐进成形实验探究,并对实验样件进行壁厚测量、密度测试以及微观观测.结果表明,PP板材渐进成形后成形区域壁厚较理论值明显偏大,密度明显降低,微观形貌图中板材存在较多孔隙.由此可见PP板材在渐进成形后体积出现膨胀,故而其壁厚变化不符合余弦定理.