Manufacturing of hourglass-shaped through holes with varying diameters at different depths by dual-pulse laser drilling and laser-induced plasma-hole interaction. (April 2018)

• Record Type: Journal Article
• Authors: Liu, Ze; Wu, Benxin; Samanta, Avik; Shen, Ninggang; Ding, Hongtao; Shin, Yung C.
• Is Part Of: Manufacturing letters. Volume 16(2018)
• Page Start: 18
• Page End: 22
• Publication Date: 2018-04
• Subjects: Laser micromachining -- Laser drilling; Manufacturing industries -- Periodicals; Production engineering -- Periodicals; Manufacturing industries; Periodicals; 670
• DOI: 10.1016/j.mfglet.2018.02.007
• Languages: English
• ISSNs: 2213-8463

Abstract

Abstract: Microholes in a metal with diameters varying unusually at different hole depths (e.g., microholes with a decreasing and then increasing diameter with the depth) have important applications. This paper reports studies on a novel method of drilling such microholes in a metal, which is through "double-pulse" percussion laser drilling followed by laser-induced plasma (from a backing plate placed behind the workpiece) – hole interaction. Using this method, a through microhole has been produced in a metal workpiece, which has similar diameters at the hole entrance and exit, but a much smaller diameter at a certain waist section inside the hole.