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采用CROSS模型表示聚氯乙烯(PVC)的黏度特征,使用POLYFLOW软件数值模拟了塑料注射成型机螺杆计量段螺槽中熔体在塑化过程的三维等温流场,求解和分析了3条参考直线、yz截面和xy截面上不同时刻螺槽中的压强场、速度场、剪切速率场和黏度场,数值计算的结果表明:在螺棱附近区域物料的剪切速率大,物料剪切稀化作用增强,物料黏度减小。并采用粒子运动轨迹示踪的方法研究了塑化过程中注塑机粒子运动轨迹。得知塑化过程中注塑机粒子运动轨迹比挤出机复杂得多,有三种典型的运动方式:一部分粒子边旋转边向负Z方向运动、另一部分粒子在旋转的同时先向负Z方向运动后向正Z方向运动,还有一部分粒子和边旋转边向正Z方向运动。
The CROSS model was used to characterize the viscosity of polyvinyl chloride (PVC). The three-dimensional isothermal flow field of plastic melt in the screw metering slot of the plastic injection molding machine was numerically simulated by POLYFLOW software. Three reference straight lines , The yz section and the xy section at different time, the pressure field, the velocity field, the shear rate field and the viscosity field in the groove are calculated. The numerical results show that the shear rate of the material in the vicinity of the screw edge is large and the material shear thinning The role of enhanced material viscosity decreases. Particle trajectory of injection molding machine during plasticization was studied by particle tracing method. It is known that the particle trajectories of the plastic injection molding machine are much more complicated than the extruder during the plasticizing process. There are three typical modes of motion: one part of the particles moves toward the negative Z direction while rotating and the other part of the particles moves to the negative Z direction After moving to the positive Z direction, there is a part of the particles and while rotating to positive Z direction movement.