Abstract
The biggest factor of the difference of worked angle is occurrence of springback. To solve this problem, in this study, the ultrasonic-vibration assisted bending was performed on stainless steel foils (SUS304) to explore the springback reduction effect and its size effect of superimposed ultrasonic-vibration during bending. Size of the specimens were 10 X 5mm. Experimental parameters were frequency (1570 9410Hz), applied vibrating time (2s and 5s) and thickness (100pm and 50pm). Experimental results show that according as the frequency increases, springback decrease ratio gets higher. Thus springback reduction doesn't depend on applied vibrating time but frequency. This study also made proposal for mechanism of springback reduction effect from the aspects of compressive force and diffusion of dislocations made by ultrasonic vibration. In the case of thickness 100pm, compressive force produced by the impact loading contributes to springback reduction. On the other hand, in the case of thickness 50gm, diffusion of dislocation contributes to springback reduction. These results show that the higher frequency you use, the more you could decrease springback.
