Investigation of Burr Formation and Tool Wear During the Drilling of Commercial Purity Copper Material

Year 2020, Volume: 16 Issue: 4, 419 - 427, 30.12.2020

Hüseyin Gökçe

Abstract

Copper is one of the materials that are sought and requested in many sectors due to its high electrical and thermal conductivity values. Its high ductility makes it difficult to drill commercial purity copper and has a negative effect on hole quality. In this study, commercial purity copper material was subjected to drilling tests with HSS drills without using coolant. Surface roughness, deviation from diameter and deviation from cylindrical values were measured in varying drilling conditions and also modeled by regression analysis. Quantitative effects of the results were determined by analysis of variance. Also, wears occurring in the drill bits, burr formations at the entrance and exiting of the hole were examined. As a result of the regression analysis, it was observed that the feed rate on the surface roughness value, the coating status for the deviation from cylindrical and diameter had a significant effect on the results (P<0.05). It was observed that burrs formation in the hole entrances was insignificantly small, but the burrs formation increased at high feed rate values at the end of the holes, and decreased at high cutting speeds. It has been determined that the workpiece material tends to stick to the drill bits at increasing values of the feed rate and removal of the chips becomes difficult.

Keywords

Burr formaion, copper, drilling, regression analysis, tool wear

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