我公司加工的一种薄壁环见图１所示。其外圆与φ１３００＋０．０４内孔的同轴度要求较高。 原加工工艺为夹外圆车端面和内孔，然后用反三爪撑内孔，加工外圆和沟槽。实践证明，由于反三爪与机床主轴轴线的同轴度不能严格保证，并且由于工件壁薄，撑内孔后，工件易变形，造成加 A thin-walled ring machined by our company is shown in Figure 1. Its outer circle and φ1300 +0.04 coaxial inner bore higher requirements. The original processing technology for the folder outside the car end face and bore, and then use the anti-claw support bore, machining and groove. Practice has proved that due to the anti-three-axis and the spindle axis of the machine tool can not be strictly concentricity, and because the workpiece wall thin, after holding the hole, the workpiece is easy to deformation, resulting in Canada