Effect of the Standard and Special Geometry Design of a Drill Body on Quality Characteristics and Multiple Performance Optimization in Drilling of Thick Laminated Composites

The process parameter effects on quality characteristics of standard and special geometry design of a drill body in dry drilling of Sheet Moulding Compound (SMC) composites which are extensively utilized in structural applications, instrument bases and automotive load floors have been discussed in this report. The drilling experiments using carbide drills were conducted using Response Surface Methodology (RSM). Standard geometry (twist) drill performs better than special geometry (ratio) drill. The optimal process parameter levels were determined as 0.074 mm/rev feed and 750 RPM spindle speed for twist drill and that for ratio drill as 0.091 mm/rev feed and 1250 RPM spindle speed.