Effect of ultrasonically-assisted drilling on carbon-fibre-reinforced plastics

NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Sound and Vibration. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Sound and Vibration, Volume 333, Issue 23, 24 November 2014, Pages 5939–5952 DOI: 10.1016/j.jsv.2014.05.042This research focuses on the effect of ultrasonically-assisted drilling (UAD) on carbon fibre-reinforced plastics. High-frequency vibration was used to excite a drill bit during its standard operation. An extensive experimental study of drilling forces, temperature, chip formation, surface finish, circularity, delamination and tool wear was conducted using ∅3 mm drill and presented here. UAD showed a significant improvement in drill quality when compared to conventional drilling processes. A finite-element study was also conducted to understand the nature of drilling-force reduction in UAD

Charakter der Kraftänderung beim Rohrziehen mit Ultraschall

Mittels Ultraschallschwingungen ist es nur nur möglich, die Ziehkraft beim eingestellten Prozess zu senken, sie erlauben auch eine starke Verbesserung der Umformbedingungen in der Anfangsperiode des Ziehens, was wiederum eine Erhöhung des maximalen Umformgrades des Rohrs während eines Durchgangs ermöglicht