高温合金轴向超声振动钻削减摩机理

Reducing Friction Mechanism of Superalloy Axial Ultrasonic Vibration Drilling

针对高温合金钻削困难、钻削过程中摩擦力大等问题,采用超声振动技术加工.首先,分析了超声振动减摩机理,构建了平均摩擦力与振动参数之间的关系,并得出了平均摩擦力与振幅之间的变化趋势.建立轴向超声振动钻削系统,利用该系统对高温合金进行钻削加工.结果表明:振动振幅对孔壁表面质量的影响符合超声振动钻削的减摩特性.利用优化后的振幅超声振动钻削,与普通钻削相比,切屑形态更加规整,孔壁表面粗糙度值更小,表面质量更好.

In view of difficulties in drilling high-temperature alloys and large friction during drilling,ultrasonic machining was used.Firstly,the reducing friction mechanism of ultrasonic vibration was analyzed,the relationship between the average friction force and vibration parameters was constructed,and then the correlation between the average friction force and amplitude was obtained.An axial ultrasonic vibration drilling system was established,which was used to drill the superalloy.The results showed that the effect of amplitude on the surface quality of hole wall is consistent with anti-friction characteristics of ultrasonic vibration.Compared with that of the ordinary drilling,the production of optimized amplitude ultrasonic vibration drilling yields more regular chip morphology,smooth hole wall surface roughness,and better surface quality.