水润滑电主轴具有功耗低、无污染、阻尼特性好等优点，是高速数控机床行业的研究热点之一。然而水的低粘度特性导致了轴承的承载力与刚度低，制约主轴刚度的提高，影响机床加工精度。针对此问题，本项目提出织构化锥形水润滑电主轴结构，并以“轴承静态特性→5-DOF动态特性→主轴转子动力学”为主线，开展以下研究：针对高速织构化锥形水润滑轴承膜内的惯性、空化、紊流等复杂流动现象，建立静态特性数学模型，分析复杂流动现象下表面织构对轴承静态特性的影响机制；提出织构化锥形水润滑轴承5-DOF动态特性系数计算模型，阐明表面织构对轴承动态特性系数的影响规律；建立基于织构化锥形水润滑轴承5-DOF动态特性系数的主轴挠性转子动力学模型，研究轴承-转子耦合动力学特性，揭示表面织构对水润滑电主轴动力学特性的影响机制。项目成果可为高速、大承载、高刚度水润滑电主轴的精确设计奠定基础。

Motorized spindle with water-lubricated bearings is a new direction for future high-speed CNC machine due to its low frictional losses, pollution free and good damping. However, the low load capacity and stiffness due to the low viscosity of the water has limited the stiffness and the processing accuracy of the spindle. To solve the problem, a structure of conical water-lubricated motorized spindle with surface texture is proposed in this research. The following researches will be carried out according to the principle line of “the static performance of the bearing→the 5-DOF dynamic characteristics of the bearing→the rotordynamics of the spindle”: firstly, considering the turbulence, inertial flow, and cavitation appeared in the film of the high-speed, conical, water-lubricated bearing with surface texture, the mathematical model of static characteristics will be established to analyze the effect of surface texture on the static characteristics; secondly, a 5-DOF dynamic characteristics model for the conical water-lubricated bearing with surface texture will be established, aiming at investigating the influence of the surface texture on the dynamic characteristics; finally, a rotordynamic analysis model considering the 5-DOF dynamic characteristics of the conical water-lubricated bearing with surface texture for the flexible rotor system of the spindle will be proposed, in which the coupled rotor-bearing dynamic performance could be studied, and the influence of the surface texture on the dynamic performances of the water-lubricated spindle will be revealed. The expected results will provide theoretical basis for the precise design of the motorized spindle with water-lubricated bearings aimed at high speed, large load-capacity and high stiffness.