摘要
聚合物模内组装成型,是解决聚合物微型机械成型加工技术难题的先进成型技术,其成型的微型零件的制造精度和零件组装配合精度,主要受控于二次成型熔体充填流动与固体微型零件之间的流固耦合作用。该文通过有限元数值模拟技术,研究聚合物微型机械模内组装二次成型过程参数,对一次成型固体微型零件的流固耦合作用效应和流固耦合变形的影响规律。研究结果表明,增加二次成型熔体注射速度,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增强,并使一次成型微型零件整体温度场趋于均匀,从而导致一次成型固体微型零件流固耦合弯曲应力和弯曲变形增加,热应力和热变形减小;降低二次成型熔体注射速度,可提高聚合物微型机械模内组装成型的成型加工精度及组装配合的精度。
In-mold assembly molding is an advanced polymer molding technique in which the technical problems of polymer micromachine molding can be solved,while the polymer micromachine manufacturing accuracy and assembly precision in the molding process depend on the fluid-solid coupling interaction and fluid-solid coupling deformation between second stage melt filling flow and first stage polymer solid micro-component.The influencing rules of the second stage process parameters on the fluid-solid coupling interaction and fluid-solid coupling deformation of the first stage polymer micro-component were systematically studied by the finite element numerical simulation technology,and the influencing mechanisms were finally revealed by theoretical analysis.Research results show that increase the second stage polymer melt injection speed would enhance the fluid-solid coupling interaction between the second stage melt filling flow and the first stage polymer solid micro-component,and homogenize the premolded micro-component temperature field which resulting in increase the fluid-solid coupling bending stress and bending deformation,and reduce the thermal stress and thermal deformation of premolded micro-component.Therefore,reduce the second stage melt injection speed can improve micro-component manufacturing accuracy and assembly precision in polymer micromachine in-mold assembly molding process.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2012年第1期107-112,共6页
Journal of Plasticity Engineering
关键词
模内组装成型
微型机械
流固耦
数值模拟
in-mold assembly molding
micromachine
fluid-solid coupling
numerical simulation
