Surface Texturing Technique by Ultrasonic Turning to Produce Low Friction Surface for Various Materials

抄録

Recently, environmentally friendly technologies which is electrical vehicle, low fuel consumption vehicle and etc. are necessary to reduce amount of CO2, NOX and PM emission. To realize environmentally friendly society, fundamental techniques to improve machine efficiency are important. The machines have rotation, stroke and other many movement elements which reduces machine efficiency due to friction loss. Technologies to reduce friction force are valid to improve machine efficiency. Surface texturing techniques which fabricates periodical micro concave on the friction surface are valid to reduce friction force. It is considered the textured surface functions similar to scraped surface with many oil holes which often applied to friction surface of machine tool. Many researchers study the surface texturing technique to reduce friction loss such as laser ablation, fast tool servo machining and etc. In previous research, ultrasonic turning techniques were investigated to improve products quality, reduce tool worn out and extend tool life. Finished surface by ultrasonic turning has periodical ditch originated from tool periodical vibration by ultrasonic oscillation. This paper describes surface texturing technique by ultrasonic turning to fabricate periodical texture on various materials. Stainless steel JIS SUS304, titanium alloy Ti-6Al-4V and aluminum alloy JIS A2017 were tested on these experiments. And textured surfaces were evaluated tribological properties.