叶轮注塑成型模拟及工艺参数优化

为了研究注塑成型过程熔体在型腔内的流动状态,以LKS-250P型花园潜水电泵的离心式塑料叶轮为研究对象,应用Pro/E和Moldflow软件完成了塑料零件的三维建模与造型和注塑成型数值仿真优化的研究工作.依据浇口位置分析和浇口设计原则,对叶轮建立了2种不同的浇注系统,分析了浇注系统对型腔压力、熔接线分布以及体积收缩率的影响,数值计算预测产品可能存在的缺陷,得到了最佳的浇口位置,并对注塑工艺参数进行了优化.研究结果表明,侧浇口与点浇口相比更适合叶轮的注塑成型;叶轮出口处的叶片部分均有短射现象发生,适当地提高熔体温度和模具温度,可以消除欠注等缺陷.通过将CAD/CAE技术应用到离心式塑料叶轮的模具设计和制造中,可为类似产品的设计和生产提供参考,具有一定的工程应用价值.

Injection molding simulation of plastic impeller and process parameters optimization

In order to study flow behavior of polymer melt in the process of injection molding. The centrifugal plastic impeller of garden submersible motor-pump( LKS- 250P) is chosen as the model. Pro /E and Moldflow software are used to complete the 3D modeling,shape of the plastic part and optimize in injection molding numerical simulation. According to the analysis of gate location and principles of gate design,two different types of gating system of impeller were established. The effect of runner systems on the filling cavity pressure,distribution of welding lines and volumetric shrinkage of the plastic impeller were analyzed by means of moldflow software. Some possible defects in the products were predicted based on the numerical simulation. The optimal runner gate and the injecting process parameters were obtained. The research result shows that the side gate is more suitable than the point gate for impeller injection molding. There are short shot at the outlet of impeller blade and through appropriate increasing the melt temperature and mold temperature which can eliminate defects such as short shot.The application of the CAD / CAE technology is provided a reference for the design and production of plastic centrifugal impeller products as well as the similar products. It has certain engineering value for applications.