Experiment Research and Numerical Simulation on the Injection Molding for Ultra-thin Wall Plastic Parts

摘要

Ultra-thin wall plastic parts have great application potentialities on MEMS. However, due to the product thickness is reduced thinner, its injection molding process becomes more difficult and complicated, systematic investigation is lacking in molding characteristics for ultra-thin wall plastic parts. An injection mold to make ultra-thin wall plastic parts is designed and manufactured. Using the orthogonal experiment method (Taguchi method) and numerical simulation, the influence of different process parameters (injection rate, injection pressure, melt temperature and metering size) on the molding process for ultra-thin wall plastic parts is discussed. The results show that metering size and injection rate are the principal factors in molding process, accelerating injection rate can make a great increase in the filling ratio. Melt temperature and injection pressure are the secondary factors, but higher melt temperature and injection pressure are also necessary in molding process. All this can be well used for reference to study the cause of molding defects (warpage, weld line, e.g.) of ultra-thin wall plastic parts thoroughly.