在心轴1的两端采用圆锥滚珠轴承方式夹住工件,减少工件中心线的径向和轴向偏心量,从而提高了工件的加工精度。装卡工件4时,把固定轴承2的心轴1插入工件,推入到轴承2接触到座圈3的位置,然后把能够沿心轴轴向移动的轴承5嵌在心轴上,使轴承5沿心轴移动,直至接触到座圈 At both ends of the mandrel 1, the conical ball bearing is used to clamp the workpiece so as to reduce the radial and axial eccentricity of the centerline of the workpiece, thereby improving the machining accuracy of the workpiece. When loading the workpiece 4, the mandrel 1 of the fixed bearing 2 is inserted into the workpiece and pushed into the position where the bearing 2 touches the seat ring 3, and then the bearing 5 capable of axial movement along the mandrel is embedded on the mandrel so that the bearing 5 Move along the mandrel until it touches the seat