An Experimental Investigation of the Effect of Depth and Diameter of Pre-drilling on Friction Drilling of A7075-T651

Abstract

Friction drilling is a non-traditional drilling process, in which specimens are drilled by means of frictional heat, which is obtained from friction effect in between rotating conical tool and workpiece area. The main purpose of current study was to investigate the effect of pre-drilling depth and diameter on the bushing shape, initial deformation and frictional heat in friction drilling of A7075-T651 aluminum alloy, known as a brittle material. Results showed that the effect of pre-drilling depended on the geometrical dimensions of the tip of the tool. The initial deformation was reduced, frictional heat was generated regularly and bushing shape was in the form of cylindrical with less cracks and petal formation in conditions predrilling diameter close to the end diameter of the tip of the tool and pre-drilling depths bigger than its length. The highest temperature was recorded at 3000 rpm spindle speed and 40 mm/min feed rate. 

Keywords

• Friction drilling; Pre-drilling diameter and depth; Initial deformation; Temperature

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