复钛叠层超声椭圆振动钻削实验研究

Experimental Study on Ultrasonic Elliptical Vibration Drilling with Complex Titanium

将超声椭圆振动切削技术应用到飞机叠层材料紧固孔的加工中,针对引起叠层材料紧固孔加工时的复材分层和撕裂、钛合金切削温度高、刀具磨损严重等问题的主要因素钻削轴向力及扭矩进行研究与实验。结果表明:与普通钻削相比,超声椭圆振动钻削复材时的轴向力及扭矩均明显下降,降幅分别为16%～25%和36%～44%,且超声椭圆振动钻削的平均轴向力曲线和扭矩曲线均较为平稳,超声钻削过程更加稳定;钻削钛合金时的轴向力比普通钻削下降约40%,且振动钻削过程平稳,切屑厚度均匀,呈节状,振动钻削的孔径精度和表面粗糙度均明显优于普通钻削,有效改善了普通钻削钛合金制孔的难加工问题。

The ultrasonic elliptical vibration cutting was applied to drilling of CFRP and Ti stacks.The thrust force and torque,which caused delamination and tearing of CFRP,high cutting temperature of Ti and tool wear etc.,were studied by the experiments.The experimental results showed that compared with the conventional drilling(CD),the thrust force and torque achieved in ultrasonic elliptical vibration drilling(UEVD)of CFRP decreased16%~25%and36%~44%,respectively.And curve of thrust force and torque was stable,which indicated the ultrasonic drilling process was more stable.The thrust force for UEVD of Ti decreased around40%than CD,and this process was smooth.Uniform and segmental chips were obtained in UEVD,and hole size accuracy and roughness in UEVD were significantly better than that in CD.The difficult of CD Ti can be effectively solved by UEVD.