A Mixed Weibull Method for Reliability Analysis of Tricone Roller Bits in Blasthole Drilling

Abstract

Practice of rock drilling with tricone 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 tricone 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.