超高速磨削实验台主轴系统的精密调整

简述了超高速磨削的概况。对自行研制的超高速实验磨床的主轴径向间隙与轴向间隙、主轴加工精度和表面粗糙度以及轴承供油系统进行了合理的调整。适当加大轴向间隙和径向间隙,且后轴承径向间隙略大于前轴承径向间隙,可保证主轴在超高速运转时正常工作,减少振动,防止抱轴。采用工艺轴刮研轴承获得均匀的径向间隙。超高速磨床主轴与动静压轴承之间相对滑动速度较高,选用粘度较小的L-FD2主轴油,可使主轴得到良好的润滑,减少发热量。提高主轴的加工精度和降低表面粗糙度,可提高主轴的旋转精度和减少主轴的磨损。试验证明合理的选择主轴径向间隙和轴向间隙是改装超高速磨床的关键技术之一。

Accurate Adjustment of the Main Spindle System of Ultra-High Speed Grinder

The general situation of ultra-high speed grinding was summarized. The radial and axial gap of the main spindle,the machining precision and the surface roughness, and the oil supplying system of the bearings in the ultra-high speed grinder were adjusted and improved. The main spindle may work well by lightly aggrandizing the radial and axial gap of the main spindle, and making the radial gap of the rear bearing larger than that of the fore bearing. The radial gap uniformity can be achieved by lapping with a process spindle. The relative sliding speed is high between the main spindle and the hydro-dynamic-static bearing. The main spindle may be lubricated well by selecting low viscosity L-FD2 main spindle oil. The quantity of heat is reduced. High machining precision and low surface roughness may improve the main spindle rotating precision and decrease the wear of the main spindle. It is one of the key technologies of refitting ultra-high speed grinder to select the radial and axial gap of the main spindle.