Analysis of approximate round crater in multi-head laser texturing technology with polygon scanning

In order to obtain round texturing craters to improve the uniformity and mechanical properties of the steel sheets with elliptical texturing craters produced by traditional single-head laser texturing technology,a multi-heads laser texturing equipment using rotating polygon as scanning beam splitter and modulator is proposed.Under a certain defocusing condition,the focusing point will move along the roll surface in phase with the rotating speed of the cold roll,so that an approximate round crater with a minimal elliptical ratio (ratio of long axis to short axis) of 1.0010957:1 can be obtained in theory.Some experiments were conducted.The experiment results conform to those calculation ones.By controlling defocusing and other texturing parameters,different elliptical ratio can be designed guiding the application of multi-head laser texturing technique.