Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 206, Issue 1-3, Pages 405-411Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2007.12.057
Keywords
step-core drill; drilling; delamination; analysis of variance
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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 x 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(2)B(1)C(3) (diameter ratio = 0.74 mm/mm, feed rate = 8 mm/min and spindlespeed = 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. (C) 2007 Elsevier B.V. All rights reserved.
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