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Investigation into crater wear in drilling

2000; Elsevier BV; Volume: 40; Issue: 6 Linguagem: Inglês

10.1016/s0890-6955(99)00089-9

1879-2170

S.K. Choudhury, Ganga Raju,

Drilling and Well Engineering

This paper presents the effects of spindle rotational speed and feed rate on the crater wear along the lip of a drill. A theoretical model has been developed to correlate the cutting parameters with crater wear through the cutting forces. A series of experiments was conducted to study the performance of the drilling process in terms of drill wear and the effects of cutting parameters on it. The experiments were planned using the concept of a central composite rotatable design for three factors. An empirical relationship between crater wear and the cutting parameters at any point on the lip has been developed. The correlation coefficient between the experimentally measured and empirically calculated values of crater wear was found to be 0.9821. Crater wear has been recommended for acceptance as a performance index owing to the relative ease with which it can be measured and the fact that, at higher speeds, crater wear is more significant than flank wear. Close relationships between the experimental and theoretical results were found.