A MIXED WEIBULL METHOD FOR RELIABILITY ANALYSIS OF TRICONE ROLLER BITS IN BLASTHOLE DRILLING
S. Prakash, A. K. Mukhopadhyay
Indian Institute of Technology
Keywords: Надежность, график 3D-изолиний, матрица рассеяния, коронка, трехшарошечное долото, свойства горных пород, Reliability, 3D contour line plot, scatter plot matrix, tricone roller bits, rock proper
Abstract
Practice of rock drilling with tri-cone roller bits, which are extensively used in surface mines, needs proper modes of descriptive statistics for predicting the failure rates of its different sub- assembled components. The statistical models for drilling with tri-cone roller bits are investigated in this article and probability of the non- failure operation is calculated. The interdependency of different component failures is examined by 3D contour plot. The failure rate of the components observed is found not significantly different at 95% contour. In such condition, the reliability is best modelled by Mixed Weibull technique.
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