汽车薄壳注塑件翘曲变形及控制技术研究设计论文.docVIP

本科毕业论文 题目名称：汽车薄壳注塑件翘曲变形及控制技术研究 学 院： 专业年级： 学生姓名： 班级学号： 指导教师： 二XXX年六月十日 摘 要 常规汽车用注塑件成型工艺已为人们所熟悉，相关理论已经非常成熟，但薄壁注塑成型则不然。这是因为随着塑件壁不断变薄，聚合物熔体在型腔中冷却迅速，使得成型难度加大，导致聚合物熔体在薄壁型腔内的流动行为也与常规注塑成型有所不同。汽车注塑薄壳件是一种典型的注塑加工零件，翘曲是其制造过程中的主要缺陷。汽车诸多注塑薄壳件制品由翘曲引起的形状偏差会严重影响产品的质量。注塑成型是一个高度非线性、时变性的多参数作用过程。由于此过程具有多个参数相互作用并随时间变化的特性，所以每个参数对最后制件质量的优劣都具有不同程度的影响。为了减少最终制件的质量缺陷，提高生产质量，需要对整个成型周期中工艺参数进行控制，使对最终制件质量影响较大的工艺参数能保持在最佳范围内，从而确保制件质量达到最优。 本文确定了注塑成型的工艺参数。通过注塑成型翘曲变形的分析，确定翘曲变形产生的原因，以此确定了薄壳注塑件翘曲变形量的影响因素以及汽车薄壳件注塑成形过程中翘曲缺陷控制方法。使翘曲变形产生的废品率大大降低，减少了二次加工的几率和成本，产生了明显的经济效益。 关键词：薄壁注塑成型；翘曲变形；参数控制；质量提高 Abstract Nowadays, people are familiar with the process and method of traditional injection molding and the relative theories have been also matured, yet the thin-wall injection molding. Due to the plastic wall become thinner and the polymer melt cool quickly in the cavity, it is much more difficult to inject molding, which lead to the flow behavior of the polymer melt in thin-wall injection molding and the traditional ones are different, too. Thin-wall Plastic parts are the typical ones in auto products in which warp is the main defect and the deviations from shape which are caused by warps can also affect the quality of the product. Plastic injection is a non-linear and flexible multi-factors manufacturing process. In this process, the parameters influence on each other and change with the time. So every parameter has a different impact on the final quality. To decrease the defective parts in production and improve the quality of the production, we need to control the technology parameter in the whole cycle. Only in this way can we keep the final product quality in a best sphere and ensure the product has a high quality. The injection molding process parameters were identified in this paper. Warpage of injection molding through the analysis to determine t