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 ～8t 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 ～30t 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 dif-ferent，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 dis-tribution 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 ～8t，the deformation increases with the increase of the load and the decrease of the rotational speed; when the load is 8 ～24t，the deformation gradually decreases as the load increases and the speed decreases; when the load is 24 ～32t，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 ～30t，and the optimal load is 16 ～30 t． It is recom-mended to further improve the thermal deformation resistance by optimizing its internal structure or enhancing heat dissipation．