熔体黏弹特性对模内微装配成型制造精度影响  

Effect of melt viscoelastic characteristics on manufacturing precision of in⁃mold micro assembly molding

作　　者：付灵杰 薛鹏 周国发[1] FU Lingjie;XUE Peng;ZHOU Guofa(School of Resources&Environmental,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学资源与环境学院,南昌330031

出　　处：《中国塑料》2024年第9期66-72,共7页China Plastics

基　　金：国家自然科学基金(21464009)。

摘　　要：针对微细万向球形转动运动副的功能自润滑液膜辅助模内微装配成型,明晰其微装配界面直径制造公差—黏弹性热流固耦合冲击载荷、连续相变演化区厚度、热黏弹塑性应力—熔体黏弹弹性的多场协同耦合演化规律,是实现精密调控其制造精度的关键技术问题。结果表明,微装配界面直径制造公差受控于二次注射成型充填熔体的黏弹特性,当参考黏度由2267 Pa·s增至15000 Pa·s时,微装配界面直径制造公差由11μm增至19μm,增幅为72.7%;而当松弛时间由0.05 s增至0.25 s,则由31μm减至19μm,减幅38.7%;为了满足行业规范的尺寸制造公差技术指标≤30μm的要求,不宜采用松弛时间小于0.05 s的高弹性熔体进行其功能自润滑液膜辅助模内微装配成型。Aiming at the functional self-lubricating liquid film assisted in-mold micro assembly molding of the micro univer-sal spherical revolute motion pair,the key technical issue to achieve precise control of its manufacturing accuracy is to clarify the multi field collaborative coupling evolution law among the diameter manufacturing tolerance of the micro as-sembly interface,viscoelastic thermal fluid solid coupling impact load,the thickness of continuous phase transformation evolution zone,thermal viscoelastic plastic stress,and melt viscoelastic characteristics.The research results indicated that the diameter manufacturing tolerance of the micro assembly interface was controlled by the viscoelastic characteristics of the secondary injection molding melt.When the reference viscosity increased from 2267 to 15000 Pa·s,the diameter manufacturing tolerance of the micro assembly interface increased by 72.7%from 11 to 19μm.When the relaxation time increased from 0.05 to 0.25 s,the diameter manufacturing tolerance of the micro assembly interface decreased by 38.7%from 31 to 19μm.To meet the industry standard of dimensional manufacturing tolerance technical indicators≤30μm,it is not advisable to use a high elastic melt with a relaxation time≤0.05 s for the functional self-lubricating liq-uid film assisted in-mold micro assembly molding.

关 键 词：万向球形转动运动副 模内微装配成型 尺寸制造公差 黏弹特性 模拟 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]