The manufacturing of thermoplastic composite parts by water-assisted injection-molding technology
The manufacturing of thermoplastic composite parts by water-assisted injection-molding technology
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DOI：
10.1016/j.compositesa.2003.10.006
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发表时间：
2004-02
影响因子：
8.7
通讯作者：
Shih-Jung Liu;Yen-Shou Chen
中科院分区：
文献类型：
--
作者：
Shih-Jung Liu;Yen-Shou Chen
研究了一种新型的水辅助注射成型技术在热塑性复合材料制件中的应用。本实验室研制了一种注水装置，包括水泵、注水针、控制回路和带温控器的水箱。实验在装有实验室开发的注水装置的80吨往复式注塑机上进行。研究中使用的材料是短玻璃纤维填充的聚丙烯复合材料。为优化热塑性复合材料的成型工艺，采用田口正交表设计，研究了熔体温度、模具温度、短丸尺寸、水压、水温、注水延迟时间和保压时间等工艺参数对热塑性复合材料水辅助注射成型的影响。模压后，测定了模压复合材料的透水长度。在主要实验中选择的因素中，短射程尺寸和注水延迟时间是影响水辅注射成型复合材料制造的主要参数。在注塑件中观察到内部粗糙表面。水辅助注射成型的复合材料比气体辅助注射成型的复合材料具有更短的成型周期。此外，模压件中的玻璃纤维主要沿聚合物熔体的流动方向取向。还根据统计结果绘制了可成型性图，为系统优化提供了第一指导方针。
This study investigated the manufacture of thermoplastic composite parts by a novel water-assisted injection-molding technology. A water injection unit, which included a water pump, water injection pin, control circuit, and water tank equipped with a temperature controller, was developed in our laboratory. Experiments were carried out on an 80-ton reciprocating injection-molding machine equipped with the lab-developed water injection unit. The materials used in the study were short glass-fiber filled polypropylene composites. To optimize the molding process, an experimental study, based on the Taguchi orthogonal array design, was conducted to characterize the effect of different processing parameters on the water-assisted injection-molding of thermoplastic composites, including melt temperature, mold temperature, short-shot size, water pressure, water temperature, and water injection delay time and hold time. After molding, the length of water penetration in the molded composites was determined. For the factors selected in the main experiments, short-shot size and water injection delay time were found to be the principal parameters affecting the manufacturing of water-assisted injection-molded composites. Internal rough surface was observed in molded parts. Composites molded by water-assisted injection-molding were found to have a shorter cycle time than those molded by gas-assisted injection-molding. In addition, the glass fibers in molded parts were found oriented mostly in the flow direction of the polymer melt. A moldability diagram was also developed based on the statistical results to give a first guideline for system optimization.