深小孔加工一直是机械加工的难点之一，因为加工时，工件刚性差、刀具刚性差，排屑困难、冷却困难，既影响孔的质量，也影响生产效率。例如在生产中有一深小孔轴类零件的外径、内孔及长度尺寸分别为３０h６、２．５及１２０mm，采用以下方法加工。如附图所示，棒料毛坯夹持 Deep hole machining has been one of the difficulties of machining, because the processing, the workpiece rigidity is poor, poor tool rigidity, chip evacuation difficulties, cooling difficulties, both affect the quality of the hole, but also affect the production efficiency. For example, in the production of a deep hole shaft parts of the outer diameter, bore and length dimensions were  30h6,  2.5 and 120mm, using the following method of processing. As shown in the drawing, the bar stock is gripped