Open AccessA Mathematical Model of Laser Drilling with Laser Absorption in the Plasma
Author(s) -
Maturose Suchatawat
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1137/1/012077
Subject(s) - laser drilling , exothermic reaction , laser , absorption (acoustics) , plasma , attenuation coefficient , materials science , process (computing) , drilling , laser cutting , energy (signal processing) , laser beam machining , mechanics , mechanical engineering , optics , laser beams , computer science , thermodynamics , engineering , composite material , physics , metallurgy , quantum mechanics , operating system
Despite being an accurate process with high processing speed, laser drilling suffers from several drawbacks including wall taper, recast layer and spatter. Hence, in order to improve the process efficiency and achieve the good hole quality, it is crucial to have a precise model which can be used as a tool to relate the process parameters to the process output. In this paper, an analytical model of laser drilling is developed. The governing equations are established from the energy equations at the solid-liquid and liquid-vapor interfaces. Absorption of laser energy in the plasma and an additional energy generated from the exothermic reaction are also included in the model. Aiming at simplifying the model, a constant value of the plasma absorption coefficient of the laser beam is employed. Validation of the model is done by comparing with the available experimental data. It is concluded that the recommended value of the plasma absorption coefficient for low carbon steel drilling is 0.2.