对航空、光学、汽车、电子、仪器仪表、精密机械等新产品的表面质量要求愈来愈高，目前欲达到镜面加工要求在国内外是采用天然单晶金刚石刀具在超精密机床上完成的，而且都认为用人造多晶金刚石（PCD）刀具不能加工镜面，但是天然单晶金刚石刀具存在焊接性差、脆性大、方向性强 Surface quality requirements for new products such as aeronautics, optics, automobiles, electronics, instrumentation and precision machinery are getting higher and higher. At present, to meet the requirements of mirror surface processing, the use of natural single crystal diamond tools at home and abroad is accomplished on ultra-precision machine tools, And all think that using artificial polycrystalline diamond (PCD) tool can not process the mirror surface, but the natural single-crystal diamond tool has poor weldability, brittleness and strong directivity