Abstract
Geometry and material of drill and drilling parameters have an essential influence on induced-delamination in drilling composite materials. Owing to the chips clogged inside the core drill, three step-core drills in drilling composite materials have been investigated in this study. The Taguchi method with orthogonal array of L 18 (2 × 3 7) was selected to realize the effects of the drilling parameters (diameter ratio, feed rate and spindle speed) on induced-delamination for various step-core drill. The experimental results indicated that the diameter ratio, feed rate and spindle speed have significant influence on delamination and the best combinations found to be A 2B 1C 3 (diameter ratio = 0.74 mm/mm, feed rate = 8 mm/min and spindle speed = 1200 rpm) for all step-core drills within the tested range. Besides, the effect of inside drill diameter and geometry for the step-core drill must be concerned on induced-delamination while first cycle drilling of composite materials.
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