Evaluation of drilled hole quality in Al 2024 alloy

This paper deals with experimental investigation in the role of different coating, point angle, cutting parameters (cutting speed and feed rate) on the hole quality (hole size, surface roughness, roundness and radial deviation of produced hole) in drilling of Al 2024 alloy. The parameters of hole quality are analyzed under varying cutting speeds (30, 45 and 60 m/min), feed rates (0.15,0.20 and 0.25 mm/rev), depths of cut (2, 15 and 25 mm) and drills (uncoated point angle:118°, TiN Pa:118°, TiAlN Pa:118°, Co 5% Pa:130°, TiN Pa:130°). This study includes dry drilling with 10 mm HSS drills with an axial depth of cut of 30 mm. This study indicate that results of the radial deviations show a similar tendency with the hole size. Hence, it can also be concluded from the experimental results that the radial deviations are effected tool vibrations during drilling. The results of this work show that cutting parameters and coatings have different effects on hole quality. However, when dry drilling aluminum alloys, HSS Co 5% drills show good performance compared to an uncoated, TiN and TiAlN coated drills. Besides, effective results have been obtained using low cutting speed and feed rate. Additionally, the best hole quality obtains from near the bottom of the produced hole.

[1]  Richard E. DeVor,et al.  Experimental investigation of the effect of drill coatings on hole quality under dry and wet drilling conditions , 2001 .

[2]  John S. Agapiou.  Design characteristics of new types of drill and evaluation of their performance drilling cast iron—I. Drill with four major cutting edges , 1993 .

[3]  J. Ni,et al.  The effects of thermal distortions on the diameter and cylindricity of dry drilled holes , 2001 .

[4]  Walter W. Olson,et al.  An experimental study of cutting fluid effects in drilling , 1997 .

[5]  C. Tsao,et al.  Cutting performance of different coated twist drills , 1999 .

[6]  Mohammed Nouari,et al.  Effect of machining parameters and coating on wear mechanisms in dry drilling of aluminium alloys , 2005 .

[7]  David K. Aspinwall,et al.  The use of soft/lubricating coatings when dry drilling BS L168 aluminium alloy , 2003 .

[8]  M. Nouari,et al.  Experimental analysis and optimisation of tool wear in dry machining of aluminium alloys , 2003 .

[9]  S. Dolinsek.  Work-hardening in the drilling of austenitic stainless steels , 2003 .

[10]  Tsann-Rong Lin,et al.  Cutting behavior of a TiN-coated carbide drill with curved cutting edges during the high-speed machining of stainless steel , 2002 .

[11]  Saied Darwish,et al.  Geometric accuracies of NC and conventionally drilled holes , 1998 .

[12]  M. Cotterell,et al.  Minimal lubrication machining of aluminium alloys , 2002 .

[13]  Hualin Zhao.  Predictive models for forces, power and hole oversize in drilling operations , 1994 .

[14]  Stephen A. Basile.  Modeling transverse motions of a drill bit for process understanding , 1993 .

[15]  R. J. Furness,et al.  Statistical Analysis of the Effects of Feed, Speed, and Wear on Hole Quality in Drilling , 1996 .

[16]  A. Galip Ulsoy,et al.  Effects of Drill Vibrations on Cutting Forces and Torque , 1994 .

[17]  Baris Korlu,et al.  Investigation of the Impact of Cutting Parameters on Surface Finish for a Discontinuous Machining Process , 2004 .

[18]  Yusuf Altintas,et al.  Time domain simulation of torsional–axial vibrations in drilling , 2006 .

[19]  Ismail Lazoglu,et al.  Forces and hole quality in drilling , 2005 .

[20]  Anselmo Eduardo Diniz,et al.  Using a minimum quantity of lubricant (MQL) and a diamond coated tool in the drilling of aluminum–silicon alloys , 2002 .

[21]  Yusuf Altintas,et al.  Generalized modeling of drilling vibrations. Part II: Chatter stability in frequency domain , 2007 .