PVDF type AE sensor monitoring system for  AL-7075 surface polishing using fiber laser

Hyojeong Kim; Seounghwan Lee; Juheon Lee; Sinyeop Lee; Hyungjin Park; Jaehyeon Nam; Heehwan Lee

doi:10.1117/12.2665278

17 March 2023 PVDF type AE sensor monitoring system for AL-7075 surface polishing using fiber laser

Hyojeong Kim, Seounghwan Lee, Juheon Lee, Sinyeop Lee, Hyungjin Park, Jaehyeon Nam, Heehwan Lee

Proceedings Volume 12409, Laser-based Micro- and Nanoprocessing XVII; 124091C (2023) https://doi.org/10.1117/12.2665278
Event: SPIE LASE, 2023, San Francisco, California, United States

Conference Poster

Abstract

Selective laser melting (SLM) is a combined process of melting and stacking three-dimensional products by fusing micro-metal powder using a laser. It has the advantage of manufacturing parts with complex structures with reduced production time. However, in the case of aluminum, the disadvantages of poor laser formability due to its high thermal conductivity, diffusivity, and reflectivity result in process defects such as bowling, pore, and poor surface quality. This study aims to develop a surface defect removal methodology during aluminum melting by laser processing and to enhance process automation capabilities by introducing a sensor monitoring scheme. In the laser experiments, aluminum specimens (AL-7075) with mechanical scratches were used and the level of surface defect removal during processing was classified depending on surface conditions. In addition, a PVDF-type acoustic emission (AE) sensor monitoring system was implemented to collect characteristic signals during the laser polishing of the machined surface(scratch). It was shown that the degree of surface defects removal and surface state could be effectively classified through a convolution neural network (CNN) utilizing the collected signals as input vectors.

Citation Download Citation

Hyojeong Kim, Seounghwan Lee, Juheon Lee, Sinyeop Lee, Hyungjin Park, Jaehyeon Nam, and Heehwan Lee "PVDF type AE sensor monitoring system for AL-7075 surface polishing using fiber laser", Proc. SPIE 12409, Laser-based Micro- and Nanoprocessing XVII, 124091C (17 March 2023); https://doi.org/10.1117/12.2665278

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available