水驱动弹头辅助注塑管件壁厚的工艺影响
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国家自然科学基金资助项目(51563010,21664002);江西省自然科学基金资助项目(20181BAB206014)


Effects of Processing Method and Parameters on the Residual Wall Thickness of Water-Projectile-Assisted Injection Molding Pipes
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    摘要:

    对水驱动弹头辅助注塑(W-PAIM)中工艺方法和工艺参数对管件壁厚的影响进行了实验研究。对水驱动弹头辅助注塑短射法(W-PAIM-S)、溢流法(W-PAIM--O)及水辅助注塑短射法(WAIM-S)、溢流法(WAIM-O)4种工艺方法进行比较,发现W-PAIM 管件比WAIM(水辅助注塑技术)管件壁厚要薄得多,而W-PAIM-O 管件壁厚又比W-PAIM-S管件壁厚要更均匀。采用正交试验法考察了熔体温度、注水压力、射胶压力、保压时间、注水延迟时间、模具温度对WPAIM-O 管件壁厚的影响规律与大小,发现注水延迟时间和熔体温度对壁厚影响很大,因素影响比合计超过70%;而射胶压力、注水压力及保压时间的影响较小,因素影响比合计不足17%;管件残余壁厚随注水延迟时间的延长逐渐增大,随着熔体温度的升高先减小后增大。

    Abstract:

    Water-projectile-assisted injection molding (W-PAIM) process is a new processing technology in which the pressurized water is utilized to drive a projectile to penetrate in the core melt to manufacture hollow plastic pipes. The effects of the processing method and processing parameters on the residual wall thickness (RWT) of W-PAIM pipe were investigated based on a lab-developed experimental platform. The experiments results of short-shot W-PAIM (W-PAIM-S), overflow W-PAIM (W-PAIM-O), short-shot WAIM (WAIM-S), overflow W-PAIM (WAIM-O), WAIM and W-PAIM pipes were compared and it is found that the RWT of W-PAIM pipe is much thinner and the RWT of W-PAIM-O pipe is thinner and more even than that of W-PAIM-S pipe. Orthogonal experiments were carried out to study the influences of the main six processing parameters, including the melt temperature, water pressure, melt pressure, packing time, water injection delay time and mold temperature, on the RWT of W-PAIM-O pipe. It is found that the main influencing parameters are the water injection delay time and the melt temperature. The total percentage of influences of these two factors is up to above 70%. The melt pressure, water pressure and packing time have a total percentage of influences of factors less than 17%, which means that they have little effects on the RWT of W-PAIM-O pipe. The RWT of W-PAIM-O pipe increases with increase of the water injection delay time. With increase of the melt temperature, the RWT of W-PAIM-O pipe first decreases and then increases.

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匡唐清,赖德炜,潘俊宇,刘文文,柳和生.水驱动弹头辅助注塑管件壁厚的工艺影响[J].高分子材料科学与工程,2018,34(12):106-111.

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