Abstract:This paper uses a longitudinal-torsional ultrasonic rolling method(LTUR)to strengthen the surfaces and improve properties of teeth flanks. Based on the Hertz contact mechanisam and Meshing theory, the model of equivalent stress from LTUR is first built. Furthermore, the process of the method is simulated and analyzed using FEM ways. Finally, the corresponding experiment device is constructed and some experiments are performed. After comparing the simulating and analytical results, applying longitudinal torsional ultrasound can effectively improve the contact stress. In this paper, the contact stress with or without ultrasonic vibration is increased by about 1.7 ~ 2 times, which causes the material to yield and then complete the strengthening. From experiments, it is shown that LTUR can improve surface properties of teeth flanks to some extent. The residual stress on the tooth surface increases with the increase of damping torque. The residual stress along the tooth profile first increases and then decreases, and the residual stress value is the largest at the pitch circle. The microhardness presents time-varying characteristics along the tooth profile. Simultaneously, the surface topography is also changed, peak-valley space is widen and the roughness is declined to about 45%~55% of its original values. Therefore, the method in this paper can strength the teeth flank, improve surface property, raise residual stresses and microhardness as well as decrease the surface roughness. In summary, this method can improve the surface quality.
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