Experimental research regarding the temperature along the cutting edge of drills

Abstract

The energetic charge of cutting edges for drill is variable along them depending, first of all, on the cutting speed – ascending from the axis to the periphery of the drill. In this way, the cutting edge’s temperature tends to rise from the axis to the periphery, determining in the same direction the wear of the drill. For drills with a variable angle of attack, descending from the axis towards the periphery, the thinning of the chip’s thickness can compensate the effect of increasing the cutting speed, and as a result, the cutting edge’s temperature. In this paper, we determine, through experiment, the level of temperature along the cutting edge of drills, by comparison, for standard drills and multi-flute drills with variable angles of attack (curved edge drills). The measurements were made using an appropriate cutting chart, transversal turning, using an edge of the drill, with a FLIR Systems ThermoVision A20M thermic vision camera. The loading results for the drill with a Ø20 diameter and two types of processed materials are presented, with variable parameters.