由民主德国设计的,检测箱体零件上孔位的新装置,在生产中与通常采用一组圆柱形或圆锥形芯棒的方法相比较,不仅可以提高检测精度,而且可以提高检测的效率。图1所示为涨开芯棒。它对直径公差为0.2毫米的孔,也能保证在孔内定心。芯棒有一个由两条凹槽把它分隔成三段的圆柱部分所组成的管状体1。它的中间一段外圆表面同被检测孔相接触。用伸出孔外的边上部分来测量孔的中心距离。当主轴11通过推块4和5使锥体2和3产生轴向移动时,中段上的8条通槽和两条分隔凹槽,使凹槽处产生弹性变形,而保证芯棒外径均匀变化。主轴上有左螺纹和右螺纹,借专用的带方孔的端面扳手 The new device designed by Democrat Germany to detect the holes on the box parts can not only improve the detection accuracy but also improve the detection efficiency when compared with the method that usually adopts a set of cylindrical or conical mandrel in production. Figure 1 shows the open mandrel. Its diameter tolerance of 0.2 mm hole, but also to ensure that the hole centering. The mandrel has a tubular body 1 which is formed by two grooves dividing it into three sections of cylindrical sections. Its middle section of the outer surface of the circle to be detected hole contact. Measure the center distance of the hole with the upper part of the hole that protrudes beyond the hole. When the main shaft 11 and the cone 2 and 3 are axially moved by the pushing blocks 4 and 5, the eight through slots and the two separating grooves in the middle segment cause the groove to be elastically deformed and ensure the uniform outer diameter of the mandrel Variety. Spindle has left and right threads, by special end hole wrench with square hole