Quality detection and control during laser cutting progress with coaxial visual monitoring

摘要

A system of coaxial visual detection and closed-loop control is developed in laser cutting tonautomatically optimize cutting speed to obtain best cutting quality. The sparks behavior is observednunder different cutting speeds by side visual monitoring. It is proved that the maximum number ofnpixels of various radiation brightness ranges of the coaxially detected sparks corresponds to thenoptimal cutting speed, represented by the lowest bottom roughness on cut face. By coaxial visualnmonitoring of cutting front and sparks, the standard deviations of shape parameters of cutting frontnand the average length of certain brightness range of sparks are, respectively, used as the signalsnfor cutting defects and the bottom roughness. The results show that the optimal cutting speed fornfree defect and low bottom roughness could be determined and kept on-line by the developednsystem. VC 2012 Laser Institute of America