A study of an improved cutting mechanism of composite materials using novel design of diamond micro-core drills精品.pdf

International Journal of Machine Tools Manufacture 88 (2015) 175–183 Contents lists available at ScienceDirect International Journal of Machine Tools Manufacture journal homepage: /locate/ijmactool A study of an improved cutting mechanism of composite materials using novel design of diamond micro-core drills P.W. Butler-Smith a, D.A. Axinte a,n, M. Daine a, A.R. Kennedy a, L.T. Harper a, J.F. Bucourt b, R. Ragueneau b a Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, UK b Diamoutils, France a r t i c l e i n f o a b s t r a c t Article history: Core drilling at small diameters in carbon composite materials is largely carried out using diamond Received 18 June 2014 electroplated tools consisting of hollow shafts and simplistic geometries that are likely to work in an Received in revised form abrasional/rubbing mode for material removal. The paper reports a step change in the performance of 29 September 2014 small diameter core drilling by facilitating a shearing mechanism of the composite workpiece through Accepted 1 October 2014 Available online 30 October 2014 the utilisation of a novel tool design. This has been achieved by laser producing core drills from solid polycrystalline diamond, incorporating controlled cutting edges where the geometries are defined. To Keywords: evaluate the efficiency of the shearing vs. abrasion/rubbing cutting mechanisms, a critical compar