Experimental study on effect of micro textured surfaces generated by ultrasonic vibration assisted face turning on friction and wear performance

چکیده مقاله

CTED P Ultrasonic vibration-assisted turning process (UVAT) is one of the effective methods in improving the tribological prop- erties. In this research, the effect of different machining parameters such as cutting speed and feed rate as well as the effect of three vibration modes of one-dimensional (LVT), elliptical (EVT), and three-dimensional (3D-VT) on the tri- bological properties is examined. In order to validate the results of UVAT process, conventional face-turning operation was performed as well. Wear and friction tests were performed using pin-on-disk wear and friction machine with identi- cal vertical load and sliding speed. The results of the tests show that the surfaces upon which micro-dimples have been created by UVAT processes reduce the average friction coefficient, wear rate and adhesion between pin and samples sur- face compared with conventional machined surfaces. Compared with conventional face-turning surfaces, average friction coefficient of the surfaces face-turned by LVT, EVT, and 3D-VT processes, show a maximum decrease of 13%, 18%, and 21% respectively. Moreover, compared with CT process, because of the unique features of UVAT process in creat- ing micro-dimples, the contact between chrome steel pin and the sample surface decreases; this in turn leads to further reduction in wear rate for the processes of LVT, EVT, and 3D-VT respectively.