Tribological properties such as lubrication, friction, and wear resistance greatly affect machine operation efficiency, performance, and service life. Surface texturing methods such as scraping can be used to improve these properties. Scraping creates many small depressions on the target surface. These depressions, which are evenly distributed, function as oil holes and thus improve lubrication performance. This paper describes a surface texturing technique based on ultrasonic vibration-assisted turning (UVAT) that simultaneously improves tribological properties and machinability. In UVAT, the cutting tool is oscillated mainly in the principal direction. Vibration in the radial direction, which is induced by Poisson deformation, periodically digs up or pushes the workpiece surface in the radial direction, creating a textured surface. A surface subjected to UVAT has periodic depressions along the workpiece rotation direction. The texturing rate of UVAT is up to 6700 mm²/min, which is higher than that of manual scraping. To evaluate the tribological performance of a surface textured by UVAT, the friction coefficient between a stainless steel pin and the surface was measured under oil dipping conditions. The results of friction experiments show that the friction coefficient of the UVAT-treated surface and its fluctuation were lower than those of a conventional turned surface. The UVAT-treated surface had stable friction properties.

1. [1] S. Niketh and G. L. Samuel, “Surface texturing for tribology enhancement and its application on drill tool for the sustainable machining of titanium alloy,” J. of Cleaner Production, Vol.167, pp. 253-270, doi: 10.1016/j.jclepro.2017.08.178, 2017.
2. [2] W. Liu, H. Ni, P. Wang, and H. Chen, “Investigation on the tribological performance of micro-dimples textured surface combined with longitudinal or transverse vibration under hydrodynamic lubrication,” Int. J. of Mechanical Sciences, Vol.174, 105474, doi: 10.1016/j.ijmecsci.2020.105474, 2020.
3. [3] F. Huang and X. Jin, “Surface texture generation using high-feed milling with spindle speed modulation,” Precision Engineering, Vol.72, pp. 13-24, doi: 10.1016/j.precisioneng.2021.04.005, 2021.
4. [4] S. Yan, C. Wei, H. Zou, J. Chen, Y. Li, T. Shen, A. Wang, T. Sui, and B. Lin, “Fabrication and tribological characterization of laser textured engineering ceramics: Si3N4, SiC and ZrO2,” Ceramics Int., Vol.47, No.10, pp. 13789-13805. doi: 10.1016/j.ceramint.2021.01.244, 2021.
5. [5] R. Zhang, P. Steinert, and A. Schubert, “Microstructuring of surfaces by two-stage vibration-assisted turning,” Procedia CIRP, Vol.14, pp. 136-141, doi: 10.1016/j.procir.2014.03.026, 2014.
6. [6] K. Tsuji, S. Kaibu, and Y. Ihara, “Research on the Cutting Texture by Turn-milling Process,” Proc. of JSPE Autumn Meeting, 693, 2016 (in Japanese).
7. [7] H. Isobe, S. Tsuji, K. Hara, and J. Ishimatsu, “Improvement of Removal Rate of Tape Lapping by Applying Fluid with Ultrasonic Excited Cavitation,” Int. J. Automation Technol., Vol.15, No.1, pp. 65-73, doi: 10.20965/ijat.2021.p0065, 2021.
8. [8] K. Egashira, R. Kumagai, R. Okina, K. Yamaguchi, and M. Ota, “Drilling of microholes down to 10 μm in diameter using ultrasonic grinding,” Precision Engineering, Vol.38, No.3, pp. 605-610, doi: 10.1016/j.precisioneng.2014.02.010, 2014.
9. [9] S. Li, L. Wang, G. Li, S. Zhang, S. Wu, J. Qiao, J. Zeng, Y. Xue, and Y. Wu, “Small hole drilling of Ti-6Al-4V using ultrasonic-assisted plasma electric oxidation grinding,” Precision Engineering, Vol.67, pp. 189-198, doi: 10.1016/j.precisioneng.2020.09.020, 2021.
10. [10] K. Hara and H. Isobe, “Effect of Cutting Speed on Ultrasonically Added Turning in Soft Magnetic Stainless Steel,” Advances in Abrasive Technology, Vol.1136, pp. 390-393. doi: 10.4028/www.scientific.net/AMR.1136.390, 2016.
11. [11] K. Hara, R. Sasaki, and H. Isobe, “Machinability Improvement on High Speed Ultrasonic Turning – The Effect of Tool Oscillating Direction and Tool Chip Shape,” Materials Science Forum, Vol.874, pp. 302-307, 2016.
12. [12] K. Hara, R. Sasaki, T. Koiwa, and H. Isobe, “A study of ultrasonically added high speed turning for stainless steel – The effects of ultrasonic oscillating direction and chip breaker shape and material –,” Advances in Abrasive Technology, Vol.1017, pp. 373-376, 2014.
13. [13] K. Hara, R. Sasaki, T. Koiwa, and H. Isobe, “Study of ultrasonically assisted high speed turning for stainless steel,” Proc. of the 15th Int. Conf. on Precision Engineering (ICPE2014), pp. 692-695, 2014.
14. [14] L. Xun, Y. Shenlianga, L. Zhenghui, Z. Deyuana, Z. Xiangyua, and J. Xinggang, “Influence of ultrasonic peening cutting on surface integrity and fatigue behavior of Ti-6Al-4V specimens,” J. of Materials Processing Tech., Vol.275, 116386, doi: 10.1016/j.jmatprotec.2019.116386, 2020.