摘要
预紧力的大小直接影响机床主轴动态特性,传统的定压预紧已不能满足现代高速化机床主轴的性能需要,预紧力可控成为主轴技术的重要发展方向。采用有限元法,完成了高速主轴系统温度场分析,给出了预紧力和轴承温升的对应关系,以推荐的轴承温升为控制目标,确定高速段轴承预紧力;以轴承的疲劳寿命为设计目标,获得低速段轴承预紧力。以某高速机床主轴为例,分析并计算了预紧力随转速变化的关系曲线,研究结果表明:高速机床主轴轴承预紧力理论分析方法可行,为机床主轴的预紧力控制提供了依据。
The magnitude of the preload directly influences the dynamic characteristic of machine tool spindle. Conventional constant preload can not meet the needs of current high speed spindle performance capacity. As far as spindle technology is concerned, preload control becomes the important development trend. This article uses finite element analysis to perform thermodynamic analysis and gives the interrelation between the preload and bearing temperature. Bearing preload at high speed is confirmed by taking recommended bearing temperature as the controlling objective. Likewise bearing preload at lower speed is also confirmed by taking bearing fatigue life as design objective. Take one model of high speed as an example, this paper gives a relation between preload and rotary speed. The results indicate that theory analysis of high speed machine tool spindle bearing is feasible, which can provide a basis for realization of preload control.
出处
《精密制造与自动化》
2008年第3期29-32,58,共5页
Precise Manufacturing & Automation
基金
国家自然科学基金项目(编号:50475073
50775036)
江苏省高技术研究计划项目(编号:BG2006035)
关键词
机床主轴
轴承预紧力
主轴热特性
轴承寿命
machine tool spindle, bearing preload, spindle thermal characteristics, bearing fatigue life
