在生产实践中,我们常常遇到娄似图1所示的工件,其内孔和外圆有较高的同轴度要求。在批量生产中常常需要缩小内孔前工序公差,提高定位精度来最终达到零件精度要求。为此,我们设计出一种不需要缩小工件内孔公差的可变径心轴,对于同一规格不同尺寸偏差的零件只需通过调节心轴直径即可达到可靠的定位,其结构如图2所示。 其工作过程为:首先松开诃节螺母6使滑块4与 In production practice, we often encounter Lou like the workpiece shown in Figure 1, the bore and the outer cylindrical have higher concentricity requirements. In mass production, it is often necessary to reduce the tolerance of the pre-hole process and improve the positioning accuracy to ultimately achieve the accuracy requirements of the part. To this end, we designed a variable diameter mandrel without the need to reduce the tolerance of the bore of the workpiece. For parts with different sizes of the same size, only the mandrel diameter can be adjusted to achieve reliable positioning. The structure is shown in Figure 2 Show. The working process is as follows: first loosen han section nut 6 so that the slider 4 and