用立方氮化硼(CBN)铰刀加工精密孔,具有加工精度高、表面粗糙度参数值小、刀具寿命长、生产率高等特点。美国在采用立方氮化硼铰刀时,粗、精加工均用同一粒度(粒度按粗加工余量选)100/120(美国标准,相当于我国标准120~#),根据孔加工的要求,用2～4把铰刀加工,铰孔的尺寸精度和几何精度可在2μm之内,表面粗糙度值达到Ra0.16～0.32 With cubic boron nitride (CBN) reamer precision machining holes, with high precision machining, surface roughness parameters of small, long tool life, high productivity and so on. United States in the use of cubic boron nitride reamer, the rough and finishing are the same size (size by roughing margin election) 100/120 (American Standard, equivalent to China’s standard 120 ~ #), according to the requirements of hole processing, Reamer with 2 to 4 processing, reaming dimensional accuracy and geometric accuracy can be within 2μm, the surface roughness reaches Ra0.16 ~ 0.32