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以熔体流动方向上压力损失较大且扁平较薄的伞钩形聚碳酸酯塑件为对象,通过计算机辅助工程(CAE)数值模拟仿真设计模具的浇注系统,与正交实验方法相结合优化薄壁注塑成型中的工艺参数.通过控制注射压力以实现熔体短射的方法分别在未施加和施加不同功率超声波的作用下进行注塑成型,对成型制件质量、拉伸强度、芯层玻纤取向、熔点进行检测.结果表明:超声波有利于提高玻纤增强型聚碳酸脂的型腔填充率;改善了塑件中玻纤沿熔体流动方向的取向性,使得塑件力学性能提升;用差示扫描量热法进行热分析发现施加和未施加超声波作用成型塑件的玻璃化温度变化幅度很小.
Aiming at the umbrella-shaped polycarbonate plastic with large pressure loss and flatness in the direction of melt flow, the mold pouring system was designed by computer aided engineering (CAE) numerical simulation and optimized with the orthogonal experimental method Thin-wall injection molding process parameters. By controlling the injection pressure in order to achieve short-melt melt method were applied and applied under the action of different power ultrasonic injection molding, the molding parts quality, tensile strength, core glass Fiber orientation and melting point.The results show that ultrasonic wave can improve the cavity filling rate of glass fiber reinforced polycarbonate, improve the orientation of fiberglass along the melt flow direction and improve the mechanical properties of plastic parts, Thermal analysis with differential scanning calorimetry showed that the glass transition temperature of molded parts with and without ultrasonic action was small.