重型机械零件多为单件小批生产,因无专用量具,孔键槽对称度误差检测比较困难。图1是中心传动球磨机上的一个零件,其键槽相对于基准孔轴线的对称度公差为0.1mm。我们因陋就简,借助定位块检测孔键槽的对称度误差,简便易行,精度较高。现介绍如下: 检测时,先将定位块按图3所示装进被测零件孔内一端的键槽内,然后分两步进行测量。 1.截面测量。在被测零件的同一截面内先用内径百分表测得a上,再转过来测得另一边a下,则该截面上下两对应点之差为对称度误 Heavy machinery parts and more for the production of small pieces of a single, because there is no special measuring tool, hole keyway symmetry error detection more difficult. Figure 1 is a part of the central drive ball mill, the symmetry of the keyway axis relative to the reference hole tolerance of 0.1mm. Because we are simple, with the positioning block hole keyhole symmetry error detection, simple and easy, high accuracy. Are introduced as follows: Detection, the first positioning block as shown in Figure 3 into the hole at one end of the measured parts of the keyway, and then measured in two steps. Section measurement In the same part of the measured parts measured with an inner diameter dial indicator a, then turn to measure the other side a, then the cross section of the upper and lower point of symmetry between the two points is wrong