The polymer micromachine manufacturing accuracy and assembly precision in in-mold assembly molding process depend on the fluid-solid coupling interaction between second molding stage of melt filling flow and first molding stage of polymer solid micro-component, therefore, by means of the finite element numerical simulation, the influencing rules of the melt injection temperature of the second stage on the fluid-solid coupling deformation were systematically studied and the influencing mechanisms were finally revealed by theoretical analysis. Research results show that increasing the polymer melt injection temperature of the second stage can weaken the fluid-solid coupling interaction between the second stage of melt filling flow and the first stage of polymer solid micro-shaft surface, and make the micro-shaft temperature field of the first stage tend to be inhomogeneous which cause reducing of the fluid-solid coupling bending stress and bending deformation, and increasing of thermal stress and thermal deformation of micro-shaft of the first stage. Therefore, increasing melt the injection temperature of the second stage can reduce the fluid-solid coupling deformation, but too large melt injection temperature of the second stage will result in melting of solid micro-shaft surface of the first stage which affect the forming quality of assembly interface.%由于聚合物模内组装成型的微型机械制造精度和组装配合精度主要受控于二次成型熔体充填流动与一次成型固体微型零件之间的流固耦合作用,因此通过有限元数值模拟,系统研究了二次成型熔体注射温度对流固耦合变形的影响,并揭示了其影响机理.研究结果表明,增加二次成型熔体的注射温度,可使二次成型熔体的充填流动与一次成型固体微型轴表面间的流固耦合作用效应减弱,并使一次成型固体微型轴整体温度场趋于不均匀,从而导致一次成型固体微型轴流固耦合弯曲应力和弯曲变形减小,而热应力和热变形增加.增加二次成型熔体的注射温度可减小流固耦合变形,但二次成型熔体的注射温度过大,又会导致一次成型固体微型轴表面融化,影响装配配合界面的成型质量.
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