摘要
首先建立了轴承模型和转子模型,进而分析了高速电主轴壳体、轴承、主轴和刀具之间的连接关系,建立系统动力学模型,推导电主轴不同部位到刀具处的传递函数。然后以D62D24A型高速电主轴为例,分析转速对轴承动态支承刚度的"弱化"作用,计算系统装有刀具与未装刀具时的第一阶径向振动固有振型,理论分析并且实验验证高速电主轴静态和动态情况下系统装有刀具和未装刀具时第一阶径向振动固有频率的变化趋势。最后得到系统的固有特性受到转速和刀具双重"弱化"作用的结论。
The bearing model and rotor model are firstly built in this paper. The connection relationships between the housing, bearing, shaft and tool of high-speed motorized spindle are analyzed. A dynamical model of high-speed motorized spindle is established, and the transfer functions of different parts of the motorized spindle to the tool are deduced. Then, based on the D62D24A type motorized spindle, the weakening effect of speed on bearing dynamical stiffness is analyzed. The first order inherent modal shape and inherent frequency are investigated numerically and experimentally for both situations of with and without the tool. The resuhs show that both tool and speed have a ＂softening＂ effect on the inherent characteristics of system.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2017年第12期3121-3128,共8页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金青年基金(51405209)
江苏省青蓝工程优秀青年骨干教师(KYQ16005)项目资助
关键词
高速电主轴
动力学特性
刀具处传递函数
high-speed motorized spindle
dynamical characteristics
transfer functions at the tool
