Nanosys-1000机床静压止推轴承流场分布规律及承载特性  

Flow field distribution and bearing characteristics of hydrostatic thrust bearing in Nanosys-1000 machine

作　　者：夏毅敏[1] 杨添任[1] 张刚强[1] 罗松保 禹宏云[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,湖南长沙410083 [2]北京航空精密机械研究所航空科技重点实验室,北京100076

出　　处：《光学精密工程》2013年第1期144-150,共7页Optics and Precision Engineering

基　　金：国家863高技术研究发展计划资助项目(No.2008AA000513);国家自然科学基金资助项目(No.51175518)

摘　　要：为了提高Nanosys-1000非球面曲面光学零件超精密加工机床加工精度,研究了机床核心部件静压止推轴承内流场分布规律,进而揭示其承载特性。利用ANSYS/Fluent软件建立对称结构静压止推轴承扇形油垫的仿真模型,采用层流模式对进油压力为1.3～1.9 MPa、油膜厚度为20～36μm的油垫流场分布规律与承载特性进行分析。研究结果表明:油垫内压力在油腔区域比较均匀,沿封油边呈线性下降;油膜承载力随油腔压力线性增长,且在同一进油压力下,油膜厚度越小,油膜承载力越大,进油压力为1.5MPa时,油膜厚度从36μm减小到20μm,油腔压力从3.05×105 Pa增加到8.02×105 Pa,油膜承载力相应地从880N增加到2 109N;同一负载即油膜承载力下,进油压力越高,油膜厚度越大,油膜承载力为1 320N时,进油压力从1.3MPa增加到1.9MPa,油膜厚度从26μm增加到30μm;同一油膜厚度下,进油压力越高,润滑油流量越大,油膜厚度为28μm时,进油压力从1.3MPa增加到1.9MPa,润滑油流量从0.179L/min增加到0.231L/min。相关研究结果在研制的Nanosys-1000非球面曲面超精密加工机床静压止推轴承上得到了验证。To improve the machining accuracy of Nanosys-1000 ultra-precision machine for aspheric op- tics, the flow distribution of a hydrostatic thrust bearing which is one of core components in the ma- chine was researched to reveal the characteristics of the bearing. A simulation model of fan-shaped oil pad for a symmetrical structure hydrostatic thrust bearing was created by using ANSYS/Fluent soft- ware, and the flow field distribution law and bearing characteristics of the oil pad on a inlet oil pres- sure of 1.3-1.9 MPa and an oil film thickness of 20-36μm were analyzed by using a laminar flow mod- el. The results show that the pressure in the oil chamber region is very uniform and it decreases line-arly along resistive oil edges. Furthermore, the oil film bearing capacity is linear growth with the oil cavity pressure. Under the same inlet oil pressure, the smaller the oil film thickness is, the greater the oil film bearing capacity is; when inlet oil pressure is 1.5 MPa, the oil film thickness decreases from 36 μm to 20 μm and the oil cavity pressure increases from 3.05 × 105 Pa to 8.02 × 105 Pa; accordingly, the oil film bearing capacity increases from 880 N to 2 109 N. Under the same load, the higher the inlet oil pres- sure is, the larger the oil film thickness is; when the oil film bearing capacity is 1 320 N, the inlet oil pressure increases from 1.3 MPa to 1.9 MPa; accordingly, the oil film thickness increases from 26μm to 30μm. Mo- reover, under the same oil film thickness, the higher the inlet oil pressureis, the larger the oil flow is; when the oil film thickness is 28μm, the inlet oil pressure increases from 1.3 MPa to 1.9 MPa; accordingly, the oil flow increases from 0. 179 L/min to 0. 231 L/min. The relative research results have been verified in the hy- drostatic thrust bearing of the Nanosys-1 000 ultra-precision machining tool.

关 键 词：超精密加工机床 液体静压止推轴承 流场分布 承载特性 

分 类 号：TH133.3[机械工程—机械制造及自动化]