在生产中对自动线和流水线加工箱体平面的精度进行的观察说明,要保证平面度的要求是有很大困难的。因此在很多情况下对图纸作了更改,以放宽最初规定的平面度允差。用作基准的平面也有这种情况。可是基面的平面度对工件的加工精度,特别是对各面的相互位置精度有很大的影响。以压力铸造的铝合金气缸体为例。缸体与缸盖接合面的平面度公差规定为0.1mm。在生产中,偏差 The observation of the accuracy of the flatness of automatic and assembly lines in production in production shows that it is very difficult to ensure the flatness requirement. Therefore, in many cases the drawings have been changed to relax the flatness tolerance as originally stipulated. This is also the case for the plane used as a benchmark. However, the flatness of the base surface of the workpiece processing accuracy, especially for each side of the mutual positioning accuracy has a great impact. Take pressure-cast aluminum alloy cylinder body as an example. Cylinder and cylinder head joint surface flatness tolerance is specified as 0.1mm. Deviation in production