滚动轴承在长期使用后,轴承滚道严重磨损,滚柱与外环之间的摩擦力增大,当摩擦力增大到足以克服外环与轴孔之间的塑性摩擦力F时(图1),迫使轴承外环在箱体孔内转动,逐渐造成箱体孔磨损。产生箱体孔的不圆度(一般为0.03～0.08毫米),造成前后轴孔的不同轴度,轴承外环与箱体孔的配合松动。这将严重影响主轴回转精度,降低机床使用性能。 Rolling bearing in the long-term use, the bearing raceway serious wear and friction between the roller and the outer ring increases, when the friction increases enough to overcome the outer ring and the shaft between the plastic friction F (Figure 1) , Forcing the bearing outer ring rotation in the box hole, gradually causing the box hole wear. Occurrence of box hole non-roundness (usually 0.03 to 0.08 mm), resulting in different axial bore hole before and after the bearing outer ring with the box hole with loose. This will seriously affect the accuracy of spindle rotation, reducing machine performance.