摘要
针对微细万向球形机械运动副的模内微装配成型难以满足制造尺寸公差技术要求的共性技术瓶颈,提出了功能自润滑液膜辅助模内微装配成型实现其高精密微成型与装配的技术,并模拟研究了球面微装配界面制造直径尺寸公差与功能自润滑液膜滑移系数的协同演化规律。结果表明,微装配界面直径尺寸公差与滑移系数呈现正关联关系,并与其近表面区的耦合温度、连续相变演化区厚度、热流固耦合压力、弹性正应力和黏性拖曳剪切应力呈现正关联关系。当滑移系数由1×10^(9)降至1×10^(3)时,其直径尺寸公差由211μm降至19μm,制造精度提高91%,且其最高耦合温度降幅为4.7%,连续相变区最大厚度降幅为23.8%,而其热流固耦合压力、弹性正应力和黏性拖曳剪切应力降幅分别为73%、72.8%和56.3%,这是其实现微细万向球形机械运动副精密微装配的机理。
In general, the in-mold micro assembly molding of micro-fine universal direction spherical mechanical kinematic pair is difficult to meet the technical requirements of manufacturing dimensional tolerances. To address this common technical bottleneck, the technology of the functional self-lubricating liquid film-assisted in-mold micro assembly molding was proposed to realize its high-precision micro forming and assembly. The synergistic evolution law between the manufacturing diameter dimensional tolerances of spherical micro assembly interface and the slip coefficient of functional self-lubricating liquid film was simulated and studied. The results indicated that the diameter tolerance of the micro assembly interface had a positive correlation with the slip coefficient. The diameter tolerance also had a positive correlation with the near surface coupling temperature, the thickness of the continuous phase-transformation evolution zone, the thermal fluid structure coupling pressure, the elastic normal stress, and the viscous drag shear stress in the micro spherical assembly interface. When the slip coefficient decreased from 1×10^(9) to 1×10^(3), the diameter dimensional tolerance of the micro assembly interface decreased from 211 μm to 19 μm along with an improvement in the manufacturing accuracy by 91 %, and meanwhile its maximum coupling temperature decreased by 4. 7 %. The maximum thickness of the continuous phase change zone decreased by 23. 8 %, and its thermal-fluid-solid coupling pressure, elastic positive stress, and viscous drag shear stress decreased by 73 %, 72. 8 %, and 56. 3 %, respectively. This was attributed to the mechanism to realize the precision micro assembly of micro-fine universal direction spherical mechanical kinematic pair.
作者
薛鹏
张宇
周国发
XUE Peng;ZHANG Yu;ZHOU Guofa(School of Resources&Environmental,Nanchang University,Nanchang 330031,China;School of Advanced Manufacturing,Nanchang University,Nanchang 330031,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2023年第1期66-73,共8页
China Plastics
基金
国家自然科学基金(21464009)。
关键词
万向球形机械运动副
模内微装配成型
制造精度
微装配
模拟
universal direction spherical mechanical kinematic pair
in-mold micro assembly molding
manufacturing accuracy
micro assembly
simulation
