Numerical Simulation Investigation on Single-Layer Multi-Tracks Laser Milling of A<sub>l2</sub>O<sub>3</sub> Ceramic

Abstract

Regional-input high-power laser beam inevitably leads to inhomogeneous and instable temperature distribution of laser milling(LM) process. Knowledge of thermal of multi-track LM is critical to understand the interaction of different milling tracks. Taking into account temperature-dependent thermal conduction and heat capacity, a three-dimensional transient thermal finite element model has been developed. The moving laser beam is simulated with the employment of ANSYS parametric design language and latent heat is considered by using enthalpy. Several conclusions according to the simulation results were produced, comparing with the previous track, the latter one has larger heat affected region and larger in homogeneous temperature distribution; the greatest temperature gradient takes place near the edges of milling part where the scanning direction changes.