对作为摩擦副一部分的牙轮钻头的内孔表面进行电镀银处理，可以提高轴承的密封性和使用寿命。通过XRD分析、热震试验、金相检验、扫描电镜以及能谱分析等方法分析了表面粗糙度对牙轮钻头内孔表面镀银层质量的影响。结果表明：镀银层外观和纯度基本一致的两个牙轮钻头，会由于基体的表面粗糙度不同造成镀银层的结合强度不同；降低基体的表面粗糙度可提高镀银层的结合强度及耐磨性。

As a part of friction pair, the inner hole surface of tooth wheel drill bit was electroplated with silver to improve the sealing performance and service life of the bearing. The effect of surface roughness on quality of silver coating on inner hole surface of tooth wheel drill bit were analyzed by means of XRD analysis, thermal shock test, metallographic examination, SEM and energy spectrum analysis. The results show that the appearance and purity of the silver coating on the two drill bit were basically the same, the difference was mainly due to the different surface roughness of the matrix, which caused the difference in binding strength of silver coating. Reducing the surface roughness of the matrix can improve the binding strength and wear resistance of silver coating.