Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
PERCUSSION DRILLING ON AISI 1020 STEEL USING A NANOSECOND PULSED FIBRE LASER SOURCE
Submission Author:
Santiago Javier Caraguay Correa , SC
Co-Authors:
Santiago Javier Caraguay Correa, Thiago Soares Pereira, Fabio Antonio Xavier, Milton Pereira
Presenter: Santiago Javier Caraguay Correa
doi://10.26678/ABCM.COBEM2021.COB2021-1795
Abstract
Laser drilling has particular benefits compared to other fabrication technologies because it is a non-contact process, with high accuracy and repeatability. The process offers great process parameter control, as well as excellent flexibility of materials to be processed. Therefore, thorough understanding of this process is necessary in order to achieve its full potential. Percussion drilling provides the advantage of higher drilling speed compared to trepanning and helical drilling. Holes prepared with this technique are usually used for surface conditioning prior coating applications. The aim of this work is to further understand the laser material interaction by varying pulse energy, distance to focus and number of pulses per spot in order to fabricate holes of different diameter and depth. The diameter regression method was used to evaluate the material ablation threshold. Laser percussion drilling was performed on AISI-1020 low carbon steel by nanosecond pulsed fiber laser at the fundamental wavelength of 1064 µm. Single pulse laser irradiations with incremental values of pulse energy were performed at different vertical positions of the targeted surface to the processing head. Holes diameter, hole depth and ablated craters diameters were characterized through optical microscopy. Scanning electron microscopy was performed to characterize material removal after percussion drilling and single pulse irradiation. Preliminary results showed an increase of hole diameter and hole depth with the increase of pulse energy and number of pulses, respectively. Ablated craters show a tendency of increased diameter values with the increase of distance to focus.
Keywords
laser drilling, ablation threshold, regression method, focal plane, material removal
