Research on Simulation and Control of Gas Fingering Defect in Gas-assisted Injection Molding of Multi-rib Comb Shaped Part
Multi-rib comb shaped parts have a complex structure with multiple ribs and hollow cavities,and traditional injection molding is difficult to achieve good molding results.Therefore,gas-assisted injection molding is usually used as the manufacturing process.However,gas assisted forming under complex structures will produce gas finger defects,seriously restricting the quality of part forming.Taking the calf support of a multi-rib comb shaped part as the research object,aiming at the gas finger defect of the part,based on the analysis of the structural design of the product and the molding technology,the formation mechanism of gas finger defect was analyzed theoretically.Based on Moldflow software,the finite element model of calf support was established to analyze the formation mechanism of gas finger.Based on the principle of thinning wall thickness,the wall thickness of the main body and the wall thickness of ribs were improved,and the scheme of reducing glue in the crater was proposed.The results show that with the thickness of the main body and the wall thickness of ribs decrease,the gas fingering is improved.The use of volcanic crater glue reduction scheme can avoid large-scale thinning while eliminating gas fingering defects.The test mold has verified that local thinning can accelerate the cooling of parts,form an effective freezing layer,and thus eliminate gas fingering defects.
Multi-rib comb shaped partGas-assisted injection moldingGas fingering defectQuantitative analysis of gas fingeringDefect control
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