注射工艺参数对超薄塑件成型影响实验研究

超薄塑件在微机电领域具有巨大的应用潜力，为研究其注塑成型特性，设计制造了一可成型超薄塑件的模具，利用正交试验方法和数值模拟技术研究了各工艺参数（注射速度、注射压力、熔体温度及注射量等）对超薄塑件注塑成型充模过程的影响．研究结果表明注射量及注射速度对超薄塑件注塑成型的填充起主导作用，提高注射速度能大幅度地提高填充率；熔体温度和注射压力相对于注射量和注射速度只起次要作用，但在填充过程中，较高的熔体温度和注射压力也是必要的．该结论为深入开展超薄塑件成型缺陷（如翘曲、熔接痕）的形成机理研究提供了有益的借鉴．

Research on effects of injection process parameters on molding process for ultra-thin wall plastic parts

Ultra-thin wall plastic parts have great application potentialities on MEMS.In order to investigate the injection molding characteristics for ultra-thin wall plastic parts,a mold in which ultra-thin wall plastic parts can be molded is designed and manufactured.Using the orthogonal experimental method and numerical simulation,the influence of different process parameters(injection rate,injection pressure,melt temperature and metering size) on the molding process for ultra-thin wall plastic parts is discussed.The results show that metering size and injection rate are the principal factors in molding process,and accelerating injection rate can make a great increase in the filling ratio.Melt temperature and injection pressure are the secondary factors,but higher melt temperature and injection pressure are also necessary in molding process.All these can be well used for reference to study the cause of molding defects(e.g.warpage,weld line) of ultra-thin wall plastic parts thoroughly.