Study of the mechanism of auto-unwinding threaded connections with the longitudinal ultrasonic vibrations

The mechanism of the vibration auto-unwinding of threaded connections is theoreti-cally and experimentally investigated. It is shown that with the longitudinal vibrations of a rod with the screw heterogeneity the body, placed on the helical surface, undergoes the action of centrifugal force and Coriolis force. As a result of the nonlinearity of the frictional forces of the inertial force they can cause the displacement of body over the helical surface, direction of rotation is determined by the alignment of threaded connection and unit of oscillating me-chanical deformations. The carried out experiments confirmed theoretical conclusions. Direction and angular rate of rotation of body depended on the frequency of the excited longitudinal vibrations of a rod. The obtained results are discussed on the basis of the developed theory.