Abstract: Some reasonable connects are used to assemble these parts to create the 3D solid models of the cones, claws, and teeth with Pro/ENGINEER. In the Mechanism module of PRO/ ENGINEER, loads, constrains and boundary conditions fixed, the initial conditions are determined to simulate drilling bit operation (including bit and the teeth rotary movement,up and down movement of the bit). Some analysis definitions in the initial condition are created, and the displacement, velocity, acceleration and space movement trajectories of a given point on teeth are measured under this definition. Finally the data from characteristic points on the back cone teeth, gauge teeth, and interior teeth are analyzed. All different parameters combination are compared. The movement states of different rows of teeth are obtained under given conditions. The analytical results provide a wealth of information for geometry and performance design of tricone rock bits.

Key words: tricone rock bit, teeth, PRO/ENGINEER, kinetics, simulation