Abstract: First, based on kinematics and dynamics equations of theoretical mechanics, a relatively complete physical model of swing screw is established, and the numerical solution of screw motion is obtained by computer simulation. Second, on this basis, the influence and law of the model parameters on the oscillation of the swing screw are further studied. It is found that for the same screw, the screw swing angle curve is mainly related to the initial swing angle, the root friction coefficient, the nut friction coefficient and the slope angle. The root friction coefficient and the nut friction coefficient have a greater impact. Thirdly, explains are given for the phenomenon of screw oscillation increasing and screw oscillation under different model parameters. Empirical formula is put forward which is consistent with the simulated experimental results. Finally, the advantages and disadvantages of the model are explained.

Key words: theoretical mechanics, computer simulation, oscillating screw