The invention provides a plate edge searching method and
system of a
laser cutting machine, and relates to the technical field of
laser cutting. The plate edge searching method is divided into a camera calibration part and a plate edge searching part. A camera, a
light source and a protective cover are integrated;
distortion correction is carried out on the camera; a visual kit is installed at a proper position of a
laser head; automatic calibration is carried out, and the
coordinate difference between the laser head and the camera, the tiny deviation angle caused in the camera installation process and the proportionality coefficient of the real world and the pixel world can be obtained through calibration; the laser head is moved to a mechanical origin position, picture taking is conducted, a rough coordinate of an
angular point of a plate is calculated, and the camera view center is moved to a coordinate position; picture taking is conducted, the accurate coordinate of the
angular point of the plate and the inclination angle of the plate are calculated, and the laser head is moved to the position over the
angular point of the plate; and the edge searching precision is verified through a frame, the
cutting precision is improved, the position corresponding to the laser head is arranged according to actual needs, the occupied space is smaller, mounting and dismounting are flexible, and protection is in place.