Abstract
AbstractThe paper presents a methodology to model the geometry and forces of twist drills with generic point geometry. Starting from a detailed computer-aided designed (CAD) geometric model for a fluted twist drill in terms of bi-parametric surface patches using NURBS to present a generic model for the cutting lip and chisel edge, mechanistic model has been used to predict the forces. Optimization technique has been employed to obtain the points of intersection of surface patches. Using mechanistic model for normal and friction forces for the oblique cutting elements on the cutting lips and the chisel edge, the force components have been calculated, resolved and integrated to give the total thrust and torque for the generic profile of the drill.
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