Surface quality of helical grinding holes of engineering ceramics with longitudinal-torsional composite ultrasonic vibration

LIN Jia-jie1, WEI Xin1, YANG Yu-hui2, WANG Yong-chao1,3
（1.School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;
2.School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808,China;
3.Synergy Innovation Institute for Modern Industries of GDUT, Heyuan 517583, China）

Abstract: Aiming at the problem of poor surface quality in the traditional grinding of engineering ceramics, the advantages of ultrasonic vibration assisted machining and helical machining were summarized and analyzed, and the machining method of longitudinaltorsional composite ultrasonic vibration assisted helical grinding was proposed.The experimental study on longitudinaltorsional composite ultrasonic, longitudinal ultrasonic machining and ordinary grinding effect on surface quality of hole condition was carried out by using ultrasonic machine and white light interferometer and Mahr surface roughness measuring instrument,and further explore longitudinaltorsional composite ultrasonic vibration assisted helical grinding of amplitude, thread pitch, feed rate, spindle speed for machining surface quality of hole.The results indicate that longitudinaltorsional composite ultrasonic vibration machining is beneficial to improve the surface quality of hole making compared with longitudinal ultrasonic machining and ordinary machining. The influences of ultrasonic amplitude and thread pitch on the surface roughness of hole bottom and hole wall are similar, while the influences of spindle speed and feed rate on the surface roughness of hole bottom and hole wall are generally opposite.
Key words: longitudinal-torsional composite ultrasonic vibration; helical grinding; hole-machining; surface roughness