基于高转速涡轮式数控微主轴单元设计及关键技术研究

Design and Key Technology Research Based on High Speed Turbine CNC Microspindle Unit

高速电主轴内置电机与主轴一体零传动,能将主传动系统转动惯量减到最小,高转速数控微主轴单元系统已成为现代加工中心机床主要关键部件。本文从高转速微主轴支承型式、磁悬浮轴承支承、动静压力轴承支承、主轴控制及润滑冷却技术等高转速微主轴单元关键技术上进行分析;并对主轴变频器及冷却方式选择、轴承选型与电主轴参数计算、数控微主轴单元简化及刚度计算,可将主轴单元模型计算数据与测试实物或同类型样本给出数据对比,判断其选用是否合理。

High-speed motorized spindle built-in motor and spindle integrated zero transmission,can reduce the moment of inertia of the main drive system to a minimum,high speed CNC micro spindle unit system has become the main key components of modern machining center machine tools.This paper analyzes the key technologies of high speed micro-spindle unit,such as support type of high speed micro-spindle,magnetic suspension bearing,dynamic and static pressure bearing,spindle control and lubrication cooling technology.And the spindle converter and cooling mode selection,bearing selection and motorized spindle parameter calculation,numerical control micro spindle unit simplification and stiffness calculation,can be compared with the spindle unit model calculation data and test material or the same type of samples given data,judge whether the selection is reasonable.