日本某大学设计出超高速新型主轴结构及其润滑方法。一般机床主轴轴承的预紧量,是不能随转速的改变而改变的。但在不同的转速下滚动体的离心力和温升是各不相同的,所以高速旋转时可能烧焦咬死,而低速时则可能刚度不足。新型主轴结构是在主轴部件中设置了压电促动器和畸变元件(见图)。根据滚珠通过畸变仪所在位置时外圈的振幅,可测得轴承的预紧 A university in Japan designed a new type of high-speed spindle structure and lubrication method. General machine spindle bearings preload, it can not change with the speed change. However, at different speeds, the centrifugal force and temperature rise of the rolling elements are different, so high-speed rotation may scorch, but may be less rigid at low speeds. The new spindle structure is set up in the spindle components piezoelectric actuators and distortion elements (see photo). According to the position of the ball through the distortion when the outer ring of the amplitude can be measured preload bearing