Abstract: In this paper, the teeth on bit are put in the coordinate system easy to describe. The space position shift of teeth are realized by means of coordinate shift. Based on the geometry and kinematics of roller cone bits, the computer simulation model of roller cone bits is set-up which can actually reflect the shapes, sizes and the relative positions of the teeth on bit during the bit drilling process. The study is one of the key problems of simulation research of bit rock interaction as well as the foundation of analyzing the working behavour of roller cone bits.

Key words: Roller bit, Artificial simulation, Model