首页|Ultrasonic peening for dieless metal deformation in vacuum conditions
Ultrasonic peening for dieless metal deformation in vacuum conditions
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NSTL
Elsevier
Ultrasonic peening (UP) systems have recently attracted much attentions as a flexible dieless plastic deformation manner with merits of deep stress penetration and efficient shaping capability. Compared with conventional shot peening techniques, UP systems are promising for special processing in vacuum conditions but rarely explored before. In this paper, an ultrasonic peening system is designed, fabricated and finally characterized in vacuum conditions. The transducer can amplify the vibration amplitude and then trigger rod pin arrays to accelerate simultaneously towards the workpiece. Numerical results reveal that under high-speed impact one compressive residual-stress layer is created and results into the bulk deformation of the workpiece. Measurements on the prototype ultrasonic peening transducer confirm the vibration performance and captured rapid movement of rod pin arrays verifies the proposed impact principle. With the driving voltage of 100 V at resonance, one piece of 5 mm 7055 aluminum alloy specimen could be deformed with 0.61 mm arc height after 10 min peening. At last, the validation for ultrasonic peen forming in vacuum conditions is conducted and variation for the deformation level is obtained and analyzed. The proposed method and tested results open a new way for ultrasonic peen forming to be implemented for special processing in extreme environments.
NSTL
Elsevier
