注射压缩成型与常规注射成型的模腔压力对比分析

摘要

The cavity pressure sensors were mounted in the self-developed injection compression mold. Comparison and analysis on cavity pressure of conventional injection molding and injection compression molding were conducted by changing process parameters. The results show that injection compression molding can greatly decrease the injection pressure and cavity pressure, and make the cavity pressure field more uniform. During the conventional injection molding, the influence of mold temperature on the cavity pressure is the most significant factor, followed by melt temperature, pressure holding time and holding pressure. During the injection compression molding, the compression speed influences the most, followed by melt temperature, mold temperature and compression stroke. The technological advantages and pressure field characteristic of injection compression molding were further validated with the low residual stress and small warpage, indicating the cavity pressure plays a major role in guiding processing properties.%在自主开发的注射压缩模具上安装模腔压力传感器,从工艺角度出发,对常规注射成型和注射压缩成型的模腔压力进行了工艺相关性的对比与分析.结果表明,注射压缩可有效降低注射压力和模腔压力,使模腔压力场更加均匀.常规注射成型中模腔压力受模具温度的影响最大,其次为熔体温度、保压时间和保压压力,而注射压缩成型中压缩速率对模腔压力的影响最大,其次为熔体温度和模具温度,压缩行程最弱.低残余应力与低翘曲变形进一步验证了注射压缩的技术优势和压力场特征,表明了模腔压力具有重要的工艺性能指导作用.