在一般情况下,φ6毫米以下的精密小孔是不能直接采用钻削方法加工的。大多数都采用钻、铰后留研磨量,并在热处理后用研磨的方法达到。然而钻铰这样小的孔,要达到▽▽▽7的光洁度和0.01毫米精度是很困难的。为解决困难,我厂王玉连同志在长期的生产实践中摸索到一些经验, Under normal circumstances, the precision of φ6 mm holes can not be directly processed using the drilling method. Most are used to drill, the amount of grinding left after the hinge, and after heat treatment with grinding method to achieve. However, it is difficult to drill a hole of such small size to achieve the smoothness of ▽▽▽ 7 and the precision of 0.01 mm. In order to solve the difficulties, our factory Wang Yulian comrades found some experience in the long-term production practice,