A laser cutting machine zero focus recognition method, calibration system and zero focus recognition system

Abstract

The invention provides a laser cutting machine zero-focus identification method, a calibration system and a zero-focus identification system, which relate to the technical field of optical fiber laser cutting machines. The laser head is controlled to sequentially cut at least z parallel slits on a plate, and the slit length is m, forming a line segment array; move the center of the camera field of view to the center of the line segment array, and take a picture; eliminate the lens deviation angle caused by installing the camera; process the image, and calculate the thinnest slit, and return to the corresponding position of the host computer Focal length; the upper computer will automatically return to zero to correct the focal length according to the feedback data. Automatic zero-focus recognition is realized, the degree of mechanical automation and intelligence is improved, the performance is stable, and the repeatability is good. It is not necessary for the cutting personnel to observe the narrowest part of the trace as the focus position, and record this point. This avoids the problem that the cutting personnel can only calculate the approximate focal length after comparison, resulting in low accuracy of the focal length and affecting the cutting quality.

Description

Technical field [0001] The present invention relates to the field of fiber laser cutting machine, and more particularly to a zero-focus recognition method applied to a fiber laser cutter, a calibration system and a zero coke recognition system. Background technique [0002] Under the promotion of global intelligent manufacturing trends, the development of laser cutting machine is increasing. Among them, the fiber laser cutting machine is a laser beam that utilizes a fiber laser as a light source, and outputs a high energy density laser beam, focuses on the surface of the workpiece, instantly melting and gasifying the region focused on the workpiece, thereby controlling the laser head movement by a CNC system. [0003] The focal length is an important factor affecting the performance of the fiber laser cutting machine. The bottom nozzle of the laser head during the cutting process is about 1 mm. Therefore, it is not possible to satisfy the focus by controlling the distance from th...

AI Technical Summary

Problems solved by technology

However, when using the above-mentioned focus identification method, it is necessary for the staff to perform manual comparison after punching or burning, which not only has certain potential safety hazards, but also can only calculate the approximate focal length, and cannot determine the precise focus. The error is large, and it is easy to cause Low accuracy of focal length affects cutting quality

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