钎焊金刚石取孔钻加工实验研究

Experimental study on the machining performance of the brazed diamond drill bits

采用高温钎焊法制备了金刚石取孔钻,进行了对硅酸盐玻璃的钻孔实验。结果表明,加工150个孔之前,取孔钻磨损平稳,之后呈现剧烈磨损状态。钻孔效率随加工孔数增多而下降。通过扫描电镜(SEM)对取孔钻加工前后表面和被加工孔孔壁表面微观形貌进行观察,发现在失效时,取孔钻的唇面上的金刚石磨损严重,呈现金刚石的剧烈磨损、磨平和脱落现象。加工孔壁在加工的后期,表面质量由于工具的磨损而大大下降。

High-temperature which is used for boring of brazing technology is adopted to fabricate diamond drill bits, silicate glass. The results show that the wear of the drill bits is steady at first, but after 150 holes the wear becomes acute. The drilling efficiency decreased with the number of holes increased. Through observation of drill bits before and after machining and the hole wall＇s surface morphology with an SEM, it is found that when the failure of drill bits, the hole wall＇s surface is severely worn and some diamond particles are dropped. The surface quality of holes drilled afterward is significantly decreased because of the wear of drill bits.