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工程科学与技术:2022,54(4):164-172
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极端工况静压支承润滑状态的微间隙油膜形貌表征
(1.哈尔滨理工大学 先进制造智能化技术教育部重点实验室,黑龙江 哈尔滨 150080;2.齐重数控装备股份有限公司,黑龙江 齐齐哈尔 161005)
Morphology Characterization of Micro-clearance Oil Film of Hydrostatic Bearing Under Extreme Conditions
(1.Key Lab. of Advanced Manufacturing and Intelligent Technol., Ministry of Education, Harbin Univ. of Sci. and Technol., Harbin 150080, China;2.Qiqihar Heavy CNC Equipment Corp.LTD., Qiqihar 161005, China)
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投稿时间:2021-05-30    修订日期:2021-08-07
中文摘要: 极端工况条件下,静压支承间隙润滑油膜受到强挤压力与强剪切力的联合作用,润滑油的温度升高,黏度下降,油膜变薄,导致运行过程中极易发生摩擦学失效且润滑状态极难获得。为解决此技术难题,设计一种新型油垫可倾式静压支承结构,形成静动压混合推力轴承,提出利用微间隙油膜形貌来表征静压支承润滑状态的想法。针对新型双矩形腔油垫可倾式静压支承,建立温升和功耗、热固耦合变形、流固耦合变形及油膜形状等数学模型。使用 Solidworks 3维软件建立静压支承油膜的3维几何模型,利用ANSYS ICEM 软件进行高质量的间隙油膜结构化网格划分,将油膜网格导入ANSYS CFX设置对应的边界条件,应用MATLAB拟合46#润滑油的黏温关系曲线进行变黏度仿真,求解并分析极端工况下微间隙油膜温度场和油膜压力场分布特征,求得摩擦副热力耦合变形。将变形场数据提取并导入MATLAB中进行数据处理,获得3维油膜形貌,判断静压支承润滑状态。搭建油膜厚度测量装置,获得油膜厚度状态,验证理论分析和数值模拟所获得的油膜形貌的正确性。结果表明:极端工况下,该新型结构润滑效果大大改善,轻载高速时热变形起主导作用,油膜厚度差异较大;低速重载时力变形占主导地位,油膜较平滑;油腔外侧封油边交角处变形最大,此处油膜最薄,易发生摩擦学失效。
Abstract:Under extreme working conditions, the lubricating oil film in the clearance of hydrostatic bearing is subjected to the combined action of strong extrusion pressure and strong shear force. Therefore, the temperature of lubricating oil increased, and the viscosity decreased, resulted in the oil film becomes thinner. During the operation, the hydrostatic support is prone to tribological failure and the lubrication state is difficult to obtain under extreme conditions. In order to solve this technical problem, the new inclined oil pad of hydrostatic support structure was designed to form a static and dynamic pressure hybrid thrust bearing, and an idea that use the micro-gap oil film morphology to characterize the lubrication state of the hydrostatic support was proposed. The equations such as temperature rise, power consumption, thermal-solid coupling deformation, fluid-solid coupling deformation and oil film shape were derived for the new double rectangular cavity hydrostatic bearing with tilting oil pad. In the first, Solidworks software was used to establish the three-dimensional geometric model of hydrostatic support oil film, ANSYS ICEM software was used to carry out high-quality gap oil film structured mesh division, oil film mesh was introduced into ANSYS CFX to set the corresponding boundary conditions, and MATLAB was used to fit the viscose-temperature relation curve of 46# lubricating oil for variable viscosity simulation. The distribution characteristics of the oil film temperature and oil film pressure fields under extreme operating conditions were solved and analyzed. In the second, the thermal-mechanical coupling deformation of the friction pairs and the three-dimensional oil film shape were obtained by data processing in MATLAB to judge the lubrication status of hydrostatic support. In the end, an oil film thickness measuring device was set up to obtain the oil film thickness state and verify the correctness of the oil film morphology that obtained by theoretical analysis and numerical simulation. The results showed that the lubricating performance of the structure is improved significantly under extreme working conditions. In the light load and high speed situation, the thermal deformation plays a leading role and the oil film thickness is uneven. Correspondingly, and the oil film is smoother when the force deformation dominates at low speed and heavy load situation. The greatest deformation appeared at the corners of the sealing oil edges on the outside of the oil cavity, where the oil film is the thinnest, which is prone to tribological failure.
文章编号:202100503     中图分类号:TH133.3    文献标志码:
基金项目:国家自然科学基金项目(51375123);黑龙江省自然科学基金项目(E2016040)
作者简介:第一作者:于晓东(1971―),男,教授,博士生导师.研究方向:润滑理论及轴承研制.E-mail:yuxiaodong@hrbust.edu.cn
引用文本:
于晓东,陈敏敏,赵岩,唐邦耀,王松柏,李士昊,姜辉.极端工况静压支承润滑状态的微间隙油膜形貌表征[J].工程科学与技术,2022,54(4):164-172.
YU Xiaodong,CHEN Minmin,ZHAO Yan,TANG Bangyao,WANG Songbai,LI Shihao,JIANG Hui.Morphology Characterization of Micro-clearance Oil Film of Hydrostatic Bearing Under Extreme Conditions[J].Advanced Engineering Sciences,2022,54(4):164-172.