Shrinkage behavior is a crucial problem in manufacturing plastic molded gear.This is because it negatively affects the dimensional\nstability and accuracy of the involute profile, aswell as the concentricity, roundness, tooth spacing uniformity, and size of the gear. By\nintegrating the Taguchi robust design, Grey relational analysis, and principal component analysis, we investigated the dimensional\nstability related to the shrinkage of tooth thickness, addendum circle, and dedendum circle of molded gear via the optimization of\nprocessing parameters and glass fiber reinforcement.Theresults revealed that the optimal combination of the processing parameters\nof the molded gear to achieve minimum shrinkage is melt temperature of 260�°C, packing pressure of 60%, packing time of 5 s, and\ncooling time of 30 s. The melt temperature showed the highest comparability sequence among the four key process parameters\nexamined, followed by packing pressure, cooling time, and packing time. Meanwhile, the presence of glass fibers induced higher\ndeviations of tooth thickness, addendum circle, and dedendum circle than those of the unfilled polyamide 6 gears.
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