Wear behaviour is important for enhancing the friction drive and wear lifetime of actuators or motors that operate with elliptical ultrasonic vibration. In particular, efficient friction-drive and long-lasting wear-life are critical for ultrasonic motor service efficiency, particularly for standing-wave ultrasonic motors, where the drive tip on the slider is in intermittent contact, followed by impact effects. A laboratory rig of ultrasonic vibration performs sliding wear tests of metallic friction pairs to investigate wear mechanisms of metallic driving and driven components. Using surface roughness, Abbott curves and fractal proportions, the surfaces of the various metallic sliders are characterised. Results show that, due to ultrasonic polishing and/or micro-rolling effect, surface roughness is reduced to varying degrees in the metallic sliders. Variations in the fractal dimensions of contact surfaces correspond to the roughness of the surface. Wear traces show that the key failure modes are plastic deformation and cracking. Ripples of 3~5 μm traces indicate the presence of fretting in duralumin sliders when the driving tip on the slider is in sporadic touch accompanied by impact results. During the operation of the ultrasonic motor, nodular cast iron demonstrated a favourable efficiency, showing a stable output performance and robust wear life.
Author(s) Details
Yanhu Zhang
Institute of Advanced Manufacturing and Modern
Equipment Technology, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013,
P.R. China.
Jianjun Qu
School of Mechatronics Engineering, Harbin Institute of Technology, 92
West Dazhi Street, Harbin 150001, P. R. China.
School of Mechatronics Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, P. R. China.
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