Measurement of Thermal Properties and Numerical Simulation of Temperature Distribution in Laser-assisted Machining of Glass-ceramic

Laser-assisted machining (LAM) is a promising technology for the machining of hard and brittle materials which reduce cutting forces by softening material with high-energy laser. In the present study, the emissivity of glass-ceramic for laser is measured, the absorptivity of glass-ceramic for laser is determined by comparing the experimental and simulation data. Combining the emissivity and absorptivity, numerical simulations of temperature distribution of glass-ceramic laser-assisted machining are carried out by using COMSOL Multiphysics. The measurement results show that the emissivity of the glass-ceramic is 0.62 and the absorptivity is 0.68. The simulation results show that the larger the laser power, the larger the spot radius, the lower the workpiece speed, and the higher the workpiece temperature, which provides an important reference for future practical experiments of glass-ceramic laser-assisted machining.