Effect of Rotation Speed and Eccentricity on Dynamic Movement Characteristics of BTA Deep-Hole Boring Bar

Since the actual boring bar physical system is characteristic of strong nonlinear, it is difficult to apply analytic method to solve. For studying the effect of dynamic characteristics induced by speed changing and eccentricity, simulations are completed for bifurcation of displacement with the variable rotation speed, no matter whether there exists cutting force. It is shown that with the speed increasing, the system's dynamic characteristic become complicated, namely, the dynamic periodic motion varieties from single, multiple to quasi periodic in turn. Analogously, eccentricity leads to the increase of the complexity of system's dynamic characteristics. The periodic motion also transforms from single, quasi, triple to quasi periodic in sequence. The cutting force variation plays an importance role on the movement stability of the system.