工程机械的箱体零件目前采用碳素结构钢拼焊结构的已日渐增多,其孔大多是压装滚动轴承的。所以对孔的精度和光洁度要求都较高,精度大多是 H_7,光洁度为5～7,要同时保证较高的精度和光洁度是不太容易的。特别是在非大批量生产的条件下,这就给工艺措施带来一定困难。通常的加工方法采用敲击刀头或使用万能镗刀架微调刀头试切法加工。这 The box steel parts of the construction machinery have been increasingly used in the welding structure of carbon structural steel. The bores are mostly press-fitting rolling bearings. Therefore, the accuracy and finish requirements of the holes are relatively high. The accuracy is mostly H_7, and the finish is 5 to 7. It is not easy to ensure high accuracy and finish at the same time. Especially under the conditions of non-mass production, this brings certain difficulties to the technological measures. The usual machining methods use tapping heads or universal boring heads to fine-tune the heads for cutting. This