1、Ultrasonically assisted turning of aviation materials :simulations and experimental studyV.I.Babitsky,A.V.Mitrofanov V.V.Silberschmidt,AbstractUltrasonically assisted turning of modern aviation materials is conducted wit

2、h ultrasonic vibration(frequency f=20KHz amplitude a =15μm ) superimposed on the cutting tool movement.An autoresonant control system is used to maintain the stable nonlinear resonant mode of vibration through out the c

3、utting process. Experimental comparison of roughness and roundness for workpieces machined conventionally and with the superimposed ultrasonic vibration, results of high-speed filming of the turning process and nanoinde

4、ntation analyses of the microstructure of the machined material are presented.The suggested finite-element model provides numerical comparison between conventional and ultrasonic turning of Inconel 718 in terms of stress

5、/strain state,cutting forces and contact conditions at the workpiece/ tool interface.KEYWORDS:Ultrasonic,machining,Turning,Finite element modelling,Microstructure1 緒論 緒論車削就是利用鋒利的楔形切削刀具把工件表層材料從圓柱形工件上去除的加工過(guò)程。這項(xiàng)技術(shù)被用于各種金屬材料

6、的加工已有幾百年的歷史了。然而，在最近幾十年里，各種合金和復(fù)合材料的廣泛應(yīng)用于各個(gè)工程領(lǐng)域。有許多新材料已經(jīng)很難用已有的普通的（CT）車削工藝去加工了，常規(guī)加工方法在應(yīng)用于航天領(lǐng)域的鎳鈦合金不銹鋼的加工中，即使是相對(duì)較低的切削速度，也能引起較高的的切削溫度，隨之而來(lái)的就是更嚴(yán)重的刀具磨損。這些棘手的材料出現(xiàn)，使得先進(jìn)加工方法更加的刻不容緩。圖 1高頻超聲波振動(dòng)疊加在常規(guī)切削刀具上（圖 1），早在 19 世紀(jì) 60 年代就已經(jīng)被關(guān)注和研究