Abstract: Based on the orthogonal experimental method, micro-injection molding processes of micro-connector with various processing parameters were studied. The weight of micro plastic part was selected as the experimental indicator. Six processing parameters, mold temperature, melt temperature, injection velocity, packing pressure, packing time, and cooling time were taken as influencing factors. The order in importance of the influencing factors was determined through range analysis (RS). The mold temperature was the most important process parameter, and the cooling time was the least important process parameter. According to the change trends of factors and levels, the optimized process parameter scheme was mold temperature 80 ℃, melt temperature 335 ℃, injection velocity 100 mm/s, packing pressure 20 MPa, packing time 1.5 s, and cooling time 3.0 s, which could be taken as a reference in the process design of micro plastic parts.

Key words: micro injection molding, orthogonal experimental method, processing parameter, mold temperature