A plate edge-finding method, calibration system and edge-finding system for a laser cutting machine

Abstract

The invention provides a method and system for finding the edge of a plate for a laser cutting machine, and relates to the technical field of laser cutting. The invention is divided into a camera calibration part and a plate edge finding part. Integrate the camera, light source, and protective cover; correct the distortion of the camera; install the vision kit at the appropriate position of the laser head; automate calibration, after calibration, you can obtain the coordinate difference between the laser head and the camera, the slight deviation angle caused by the camera installation process, Scale factor of real world to pixel world. Move the laser head to the mechanical origin position, take pictures, calculate the approximate coordinates of the corners of the sheet, and move the center of the camera field of view to the coordinate position; take pictures, calculate the exact coordinates of the corners of the sheet and the inclination angle of the sheet, and move the laser head to the corner of the sheet Click directly above; walk the border to verify the edge-seeking accuracy, improve cutting accuracy, and set it to the corresponding position of the laser head according to actual needs, taking up less space, flexible installation and disassembly, and protection in place.

Description

technical field [0001] The invention relates to the technical field of laser cutting, in particular to a plate edge-finding method, a calibration system and an edge-finding system for a laser cutting machine. Background technique [0002] Laser cutting machines have ushered in rapid development due to their high precision and high efficiency. Usually, the laser cutting machine needs to perform edge-finding operation before cutting metal sheets. At present, there are mainly two edge-finding methods: one is the edge-finding method based on capacitance, and the other is the edge-finding method based on vision. [0003] When adopting the capacitive edge-finding method, if the plate has a large format, the laser head needs to be moved a long distance to complete the edge-finding process, which takes a long time and has low edge-finding efficiency. Moreover, if the size of the plate is set incorrectly, the inclination of the plate is too large, or the initial position of the lase...

AI Technical Summary

Problems solved by technology

[0003] When adopting the capacitive edge-finding method, if the plate has a large format, the laser head needs to move a long distance to complete the edge-finding process, which takes a long time and has low edge-finding efficiency

Moreover, if the size of the plate is set incorrectly, the inclination of the plate is too large, or the initial position of the laser head is selected improperly, mechanical damage may be caused, and there are certain safety hazards; the existing visual edge finding methods mainly use template matching, based on template matching The universality of the method is low, and the feature matching points need to be manually set for each plate of different thickness and material, and it takes a lot of time to perform the calibration test, and the efficiency is low

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