Abstract: Firstly a dumbbell test model was established to research the relationship between process parameters and surface quality. Through Taguchi experimental design and signaltonoise ratio and analysis of variance methods, the effect of mold temperature, melt temperature, injection rate, filling quantity, and gas concentration on the surface quality was analyzed. The surface of the samples was characterized by scanning electron microscopy and roughness measuring instrument. Finally, the research conclusion was applied to the actual experiments, which showed that the optimal combination of parameters could be obtained from the analysis of signaltonoise ratio and variance and the surface roughness could be reduced.

Key words: microcellular foaming injection molding, surface roughness, processing parameter, optimization