对于一些工程机械零件上尺寸及形位精度要求较高,表面粗糙度要求较小,孔加工表面屈服强度要求较高,孔深较深零件的加工,若采用普通刀具将难以保证工件加工质量,且影响孔的加工效率和刀具的使用寿命。为满足上述孔加工 For some engineering machinery parts on the size and shape of the high precision requirements, the surface roughness less demanding surface requirements of the hole yield strength, deep hole deep processing of parts, if the use of ordinary tools will be difficult to ensure the quality of the workpiece processing, And affect the processing efficiency of the hole and tool life. To meet the above hole machining