为了提高机床主轴部件的刚度和抗振性,主轴常采用如图所示的三支承形式,前后支承是主要的,中间支承起辅助作用,有一些游隙。但在目前设计简化计算过程中,仍常将三个支承简化为刚性的。先将主轴采用当量直径法简化为等截面的形式,利用三弯矩方程,或梁的变形条件(即中间支承处的 In order to improve the rigidity and vibration resistance of the spindle components of the machine tool, the main shaft often adopts the three support forms as shown in the figure, the front and back support are the main ones, the middle support plays a supporting role and there is some clearance. However, in the current design to simplify the calculation process, the three supports are often simplified to rigid. First, the equivalent diameter of the main shaft is simplified as the equivalent cross-section of the form, the use of three-moment equation, or the deformation of the beam (ie, the middle of the bearing