Deep Hole Machining with a Small Diameter Drill and Ultrasonic Vibration

• Published in: Key engineering materials Vol. 749; pp. 107 - 110
• Main Authors: Masu, Yuta, Yasuki, Taiga, Fukao, Tomohito, Hagino, Masahiro, Inoue, Takashi
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 11.08.2017
• Subjects: Amplitudes; Cutting parameters; Cutting speed; Cutting tool materials; Cutting tools; Drilling; Feed rate; Lubricants; Machine tool industry; Machining; Surface roughness; Tool steels; Ultrasonic testing; Ultrasonic vibration; Vibration; Workpieces; Drilling; Tool Steel; High-Speed Steel; Ultrasonic Vibration; Lubricant
• ISSN: 1013-9826; 1662-9795; 1662-9795
• DOI: 10.4028/www.scientific.net/KEM.749.107

The method of imparting ultrasonic vibration to the cutting tool is known to improve the shape accuracy and finished surface roughness. However, a uniform evaluation of this function in drilling has not been achieved, and the cutting process cannot be checked from the outside. The aim of this study is to investigate the cutting characteristics in deep hole drilling when an ultrasonic vibrator on the table of a machining center provides vibration with a frequency of 20 kHz to the work piece. The ultrasonic vibrations in this system reach the maximum amplitude in the center of the work material. We evaluated the change in finished surface roughness between the section where drilling starts to the point of maximum amplitude with ultrasonic vibration. The main cutting conditions are as follows: cutting speed (V) 12.6 (mm/min); feed rate (s) 30, 60 (mm/rev); depth of cut (t) = 32 (mm); work material, tool steel; cutting tool material, HSS; point angle (σ) 118 (°); and drill diameter (φ) 4 (mm). Lubricant powder was also added to clarify the cutting effect, and compared the condition in which there was no ultrasonic vibration. The results showed that surface roughness at the point of maximum amplitude was better than that with no vibration.