Cutting Oil Absorption into the Small-Diameter Drilling Hole

Abstract

This study reports the high-efficiency processing of a small diameter drill that applied high feed rate processing. An experiment was conducted to determine the influence of the drill diameter, spindle speed, and direction of processing on absorption properties of cutting oil. Processing was done in the gravitational and horizontal directions. The following two conditions were found to be necessary for the absorption of cutting oil in the processing hole and its arrival at the drill tip. The first condition was to prevent the inflow of fresh air by sealing the entrance to the processing hole with cutting oil. The second condition was to produce the consecutive long pitch formed chips and exhaust these chips form the processing hole. Future experiments will be conducted using drills with large diameters and processing will be assessed in the upward direction opposite to gravity of the processing hole.