注塑成型加工条件对收缩和翘曲的显著影响研究[外文翻译].rar

注塑成型加工条件对收缩和翘曲的显著影响研究[外文翻译]

英文字符：39875
中文字数：9630

　　　　　　　　　　　　　　　　　　　　　　　　　　　　
摘要:在注塑行业中的一个具有挑战性的任务是设置最佳的成型条件，以尽量减少收缩和翘曲（S&W）。本研究的目的是区分这两个词，并通过实验和数值方法相结合进行透彻的分析。本研究对个别的工艺参数进行了检查，并采用单因素方差（ANOVA）分析，在实验时区分每个变量的意义。结果表明，不同加工条件对收缩的影响是向上翘曲。具体来说，保压影响收缩是最重要的，而保压时间是确定翘曲的主要因素。收缩保压压力的反应是单调的，而翘曲图显示了一个U形的变化。因此S&W的差别可以帮助提高产品的质量。
　　　　　　　
关键词：注塑加工；聚丙烯；方差分析

A Study on the Distinguishing Responses of Shrinkage and Warpage to Processing Conditions in Injection Molding

ABSTRACT: A challenging task in injection molding industry is to minimize shrinkage and warpage (S&W) through optimal setting of molding conditions. In determining the relationship between molding conditions and product dimension, most existing literature considered S&W as a whole entity or focused on only one of them. The intention of this study was to distinguish these two terms, and perform a thorough analysis on the effect of operative conditions on S&W during injection molding process through a combination of experimental and numerical methods. Six process parameters with five levels were examined on a box-shaped product, and the single factor analysis of variance (ANOVA) was adopted in dentifying the significance of each variable in the experiment. Results indicated that the effect of processing conditions on shrinkage is different from that on warpage. Specifically, packing pressure affects shrinkage most while packing time is the dominant factor in determining warpage. The reaction of shrinkage to packing pressure is monotonic, whereas the plot of warpage shows a U-shaped variation. A differential treatment of S&W can therefore help to enhance product quality. VC 2011 Wiley Periodicals, Inc. JAppl Polym Sci 125: 731–744, 2012

Key words: injection molding; processing; poly(propylene);ANOVA