Experiment And Computer Simulation Research Of The Injection Molding For Ultra-thin Wall Plastic Parts

Originally developed as the secondary process of MEMS, micro injection molding is presently on its way to become an established manufacturing process. And it attracts the attention for its multitudinous strongpoint all the world around.This paper synthesizes the development of micro molding technology domestic and international, and the research results of experiment and numerical simulation on process parameters, experiment and computer numerical simulation research of ultra-thin wall plastic parts filling are put forward. Ultra-thin wall plastic parts is one kinds of micro part with simple structure, study on it is the basic research on micro molding, it will give help to further study on micro molding.This paper selects one mold with two cavities of circle and rectangle, the products of different thickness of 0.1mm and 0.2mm are studied. Using Moldflow software and orthogonal experiment method, the influence of different process parameters (injection rate, injection pressure, melt temperature, metering size, mold temperature and product thickness, etc.) on the molding process for ultra-thin wall plastic parts is discussed. Confirm the effect disciplinarian of each parameter to molding and confirm the important influence factors.The research results show that: the product thickness is the decisive parameter to molding, when the product thickness reduces, molding becomes very difficult; for ultra-thin wall plastic parts, metering size and injection rate are the leading factors in molding process, the proper metering size and high injection rate could improve the filling ratio rapidly; melt temperature and injection pressure are the secondary factors, but high melt temperature and high injection pressure are also necessary in the molding; when molding is difficult, mold temperature is important to molding, especially when the mold temperature is around the transition glass temperature of plastic material, its effect becomes more evident; computer numerical simulation could be applied in analysis of ultra-thin wall plastic parts and has very high dependability.