圆片刀超声切削Nomex蜂窝芯的切削力和表面质量研究

为了研究圆片刀加工参数对切削力和表面质量的影响,首先对圆片刀超声切削和普通切削的切削力进行了理论分析,在此基础上开展了圆片刀超声切削Nomex蜂窝芯试验,获得了进给速度、刀具转速和超声振幅对切削力的影响规律。进一步以蜂窝芯孔壁撕裂数量和长度作为加工表面质量的表征参数,定量研究了加工参数对于蜂窝芯表面质量的影响。试验结果表明:普通切削条件下,增大刀具转速和减小进给速度可以有效降低切削力;随着超声振幅的增大,切削力显著减小,相比普通切削,当超声振幅为35μm时,进给方向的切削力和刀具轴向的切削力分别减小53.1%和33.9%;切削力试验结果与理论分析结果一致。此外,Nomex蜂窝芯孔壁撕裂数量随着刀具转速的增大和进给速度的降低而减少,超声振动作用可以有效减少蜂窝芯孔壁撕裂的数量和长度。研究为圆片刀超声切削Nomex蜂窝芯的加工参数的选择提供参考。

Cutting Force and Surface Quality Research on Ultrasonic Cutting of Nomex Honeycomb Core With Disc Cutter

In order to study the effect of processing parameters on cutting force and surface quality,the cutting forces in ultrasonic cutting and conventional cutting were theoretically analyzed.On this basis,ultrasonic cutting tests of Nomex honeycomb core with disc cutter were conducted to obtain the influence of the feeding speed,rotating speed and ultrasonic amplitude on cutting force.Further,the number and length of tearing defect were selected as characterization parameters of surface quality and the influence of processing parameters on the surface quality of honeycomb core were quantitatively studied.The test results show that the cutting forces decrease with the increase of rotating speed and the decrease of feeding speed in conventional cutting.As the ultrasonic amplitude increases,the cutting forces decrease significantly.Compared with the conventional cutting,the cutting forces in feeding direction and axis direction of cutter are separately reduced by 53.1% and 33.9% when the ultrasonic amplitude increases to 35μm.The test results of cutting force are consistent with the theoretical analysis.In addition,the number of tearing defects of Nomex honeycomb core decreases with the increase of rotating speed and the decrease of the feeding speed,and the number and length of tearing defects are simultaneously improved in ultrasonic cutting.The conclusions provide guidance for selection of processing parameters in ultrasonic cutting of Nomex honeycomb core.