Presenting Electromagnetic Field-assisted Laser Groove Forming
X-D. Hu, Y-L. LI, S-Z. Bai, J-H. Yao and L. Wang
A novel process for groove forming using electromagnetic field-assisted laser machining was studied using a high power diode laser (HPDL) to machine grooves into a 316L stainless steel substrate. The effect of directional Lorentz force generated by electromagnetic field on the discharge of the molten metal in laser processing is investigated and the correspond- ing experiment is carried out. First, based on the orthogonal experiment, the effects of laser power, scanning speed, magnetic field intensity and current density on the groove forming are analysed qualitatively. Then the Box-Behnken experimental scheme is used to supplement the experimental samples, and the back propagation (BP) neural network is applied to establish the quantitative computation model of process parameters and groove morphology characteristics. The experimental results reveal that scanning speed and laser power have greater influence on the groove depth, scanning speed and magnetic field intensity have larger influence on the upper groove width, and scanning power and laser power have greater influence on the lower groove width. The process parameter model based on BP neural network can conveniently analyse the electromagnetic field-assisted laser groove forming process.
Keywords: High power diode laser (HPDL), 316L stainless steel, electromagnetic compound field, laser machining, groove forming, morphology, Box-Behnken, back propagation (BP) neural network