高速磨床电主轴热刚度耦合模型的分析与优化

Analysis and Optimization for a Coupled Stiffness and Thermal Model of High-Speed Grinding Motorized Spindle

提出了基于Timoshenko梁理论的主轴刚度与热的耦合模型,基于有限元方法,通过研究电主轴主要结构参数与润滑方式对主轴刚度和前轴承温升的影响,模拟了主轴的刚度与热性能,给出了高速电主轴系统优化方案.研究结果表明,选用油气润滑方式,当滚珠直径为10.25mm、主轴直径为100mm时,优化后前轴承的温升从优化前的26.2℃降低至22.0℃,相应地,主轴刚度从195N/μm增加至220N/μm.

A coupled stiffness and thermal model of spindles by using Timoshenko beam theory is presented. By using finite-element-method, the stiffness and thermal performances of the spindle are simulated by studying the influence of spindle structure parameters and lubrication mode on the stiffness of spindles and the temperature rise of the front bearings. Optimization method of high-speed spindle system is provided. The research result show that while the diameter of balls is 10.25 mm and the diameter of spindle is 100mm, the temperature rise of bearings is reduced from 26.2 ℃ to 22 ℃, and the stiffness of the spindle is increased from 195N/μm to 220N/μm by using air-oil lubrication.