Abstract:

A variothermal system of micro injection molding was designed, and two dumb-bell-shaped microcavities with microchannels of width 500μm and 100μm were fabricated.The molding process experiments were completed based on the Taguchi method.By considering the polymer melt flow theory on microscale and the microscale effect, the influences of the process parameters and their interactions on the molding quality of micro-structured plastic parts were investigated.The experimental results showed that with the decrease of characteristic dimension of micro-structured plastic parts the effect levels of injection pressure and mold temperature on volume filling percentage were both obviously enhanced,the influence of melt temperature was increased to some extent,that of injection stroke was reduced,and those of hold pressure and hold time were relatively unconspicuous.