The influence of superimposed ultrasonic vibration on surface asperities deformation

The process of micro forming with ultrasonic vibration is used to get better surface finishing. This technique was evaluated under different conditions in the current paper. Surface asperities deformation was found to be linear to ultrasonic vibration amplitude and static stress. To quantitatively investigate the influence of ultrasonic vibrations on micro forming, different size samples were compressed and the surface grain model was used to explain the mechanisms of action. The results show that the ultrasonic softening effect at the micro scale was closely related to the surface / total grain ratio, which is a function of the sample's dimensions.