doi: 10.3850/978-981-11-0749-8_697
Ultrasonic-Assisted Incremental Microforming of Thin Shell Pyramids of Aluminum Foil
Toshiyuki Obikawa and Mamoru Hayashi
Institute of Industrial Science, The University of Tokyo
Abstract
This paper describes the ultrasonic-assisted incremental microforming of thin shell pyramids of aluminum foil. A single point tool with a tip radius of 100 µm rotated and vertically vibrated with an ultrasonic spindle was used for improving the shape accuracy of pyramids formed on 6.5 and 12 µm-thick aluminum foils. The formability was also investigated by comparing the forming limits of shell structures formed with and without ultrasonic vibration. The shapes of pyramids incrementally formed were a truncated pyramid, twisted pyramid, stepwise pyramid and star pyramid in a size of around a millimeter. It was found that the ultrasonic vibration can improve the shape accuracy of the formed pyramids. In addition, laser heating can increase the forming limit of aluminum foil and it is more effective when the ultrasonic vibration is added.
Keywords: Incremental microforming, Microshell pyramids, Aluminum foil, Ultrasonic vibration, Laser heating, Forming limit.
