高速重载工况下静压推力轴承的热特性表征  

Thermal Performance Characterization of Hydrostatic Thrust Bearing Under High Speed and Heavy Load Working Conditions

作　　者：于晓东[1] 高维铖 伍广鹏 周文凯 毕宏伟 杨晓冬[1] 郑小军[1] YU Xiaodong;GAO Weicheng;WU Guangpeng;ZHOU Wenkai;BI Hongwei;YANG Xiaodong;ZHENG Xiaojun(MOE Key Laboratory of Advanced Manufacturing and Intelligent Technology,Harbin University of Science and Technology,Harbin 150080,Heilongjiang,China)

机构地区：[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

出　　处：《华南理工大学学报（自然科学版）》2020年第9期79-85,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：黑龙江省自然科学基金资助项目(E2016040);黑龙江省普通本科高等学校青年创新人才培养计划项目(UNPYSCT-2017096)。

摘　　要：在高速重载工况下静压推力轴承由于强剪切和强挤压联合作用,油膜发热量大,温升高且分布不均,会产生热变形。不同工况下静压推力轴承对流换热不同,进一步导致工作台和底座热变形不均匀。为表征其热特性,提出等面积分割法,通过区域计算不同工况下静压推力轴承对流换热系数。运用软件ANSYS Workbench对工作台和底座温度分布及热变形进行仿真,得到工作台热变形分布及载荷和转速对轴承的影响,搭建实验台并进行验证。结果表明:承载0~8 t时,随载荷增大和转速减小,变形量逐渐增大。承载8~24 t时,随载荷增大和转速减小,变形量逐渐减小。承载24~32 t时,旋转工作台为Z向负变形,且最大变形在工作台边缘处,底座最大变形集中在底座最下面肋板部分。底座变形比旋转工作台变形小。承载16~30 t时静压推力轴承变形较小,最优承载在16~30 t之间。建议通过优化其内部结构或增强散热进一步提高抗热变形性能。Due to the dual effects of strong shear and strong extrusion,oil-film has a large heat generation and the uneven rise of temperature leads to thermal deformation in the hydrostatic thrust bearing under high speed heavy load working conditions.The convective heat transfer of hydrostatic thrust bearing under different conditions is different,which further causes uneven thermal deformation of the worktable and the base.In order to characterize its thermal characteristics,an equal-area segmentation method was proposed to calculate the convective heat transfer coefficient of hydrostatic thrust bearing under different conditions.The temperature distribution and thermal defor-mation of the workbench and the base was simulated by using ANSYS Workbench,and the thermal deformation distribution and influence of load and rotational speed on their deformation were obtained and were verified by the built experimental setup.The results show that when the load is 0~8 t,the deformation increases with the increase of the load and the decrease of the rotational speed;when the load is 8~24 t,the deformation gradually decreases as the load increases and the speed decreases;when the load is 24~32 t,the rotary table is Z negative deformation,and the maximum deformation is at the edge of the table.The maximum deformation of the base is concentrated on the lowermost rib part of the base.The deformation of the base is smaller than that of the rotary table.The deformation of the hydrostatic rotary table decreases when the load is 16~30 t,and the optimal load is 16~30 t.It is recommended to further improve the thermal deformation resistance by optimizing its internal structure or enhancing heat dissipation.

关 键 词：静压推力轴承 高速重载工况 对流换热系数 热特性表征 数值模拟与实验 

分 类 号：TK121[动力工程及工程热物理—工程热物理]