Calibration method and device used for laser processing system

Abstract

The invention discloses a calibration method and device used for a laser processing system. The calibration method includes the steps that firstly, a lens in a galvanometer is controlled to be adjusted according to a calibration picture which is edited in advance, a laser device is driven, a laser beam generated by the laser device is made to penetrate through the galvanometer, and the calibration picture is etched on marking paper which is placed on a processing platform in advance; secondly, an image, photographed by a camera, of the processing platform is obtained, and the image includes the calibration picture; thirdly, distortion correction is conducted according to the image and the calibration picture etched on the marking paper, and the corresponding relation between an image coordinate system and a galvanometer coordinate system is obtained. According to the calibration method and device used for the laser processing system, distortion correction is achieved through the calibration picture on the marking paper, a target does not need to be used, cost is saved under the premise that precision is ensured, and the calibration operation is simplified.

Description

technical field [0001] The present disclosure relates to the technical field of laser processing, in particular to a calibration method and device for a laser processing system. Background technique [0002] Laser processing refers to focusing the energy of the laser on a specific focus to achieve a high energy density, and to realize material processing by photothermal effect, such as laser marking, laser welding, laser cutting and laser drilling. Laser processing has the advantages of fast processing speed, small surface deformation and application to a variety of materials, and is used in many industrial fields. In recent years, in order to improve the processing accuracy, efficiency and stability of the equipment, it has become an inevitable trend to introduce machine vision into the laser processing system. At present, the structure schematic diagram of the more common laser processing system with machine vision is as follows: figure 1 and figure 2 As shown, wherein...

AI Technical Summary

Problems solved by technology

[0004] but, figure 1 During the calibration process of the laser processing system, the target needs to be used for distortion correction, and the price of the target is relatively expensive, resulting in a large calibration cost; and figure 2 When the laser processing system is calibrated, distortion correction is no longer performed. In this case, due to the influence of lens distortion and projection distortion of the camera itself, the calibration error is large, which affects the processing effect.

Images