Measuring and machining integrated laser three-dimensional marking method and device

Abstract

The invention provides a laser three-dimensional marking method and a device. The method comprises the following specific steps: installing and fixing a camera in a position pointing to a workbench of a laser inside-carving machine; calibrating structural parameters of the camera; placing a target part on the workbench, and measuring point cloud data of space three-dimensional coordinates of light spots on the surface to be processed of the target part; topologically reconstructing the point cloud data to form an STL triangular surface patch; inducing a part model STL document, taking an image to be marked as a grain, and pasting the grain on a triangular surface patch grid provided by the STL; iterating the triangular surface patch grid, judging the gray-scale value on the grid, and judging whether marking is needed or not according to the gray-scale value; recording the coordinates of points which need to be marked to form a marking point set list; sequencing the marking point set according to the magnitude of a Z value to generate marking point set data; and controlling the processing power of a laser to mark according to the marking point set data by CNC software. On the basis of the laser inside-carving machine, the laser three-dimensional marking device is provided with the optical camera.

Description

technical field [0001] The invention relates to a laser three-dimensional marking method integrating measurement and processing and a device used therefor. The laser three-dimensional marking method is a three-dimensional surface marking process and belongs to the field of laser processing. Background technique [0002] In recent years, laser processing technology has been successfully applied in countless industrial applications. It is a non-contact special processing method that uses high-power-density laser beams to irradiate workpieces to melt or gasify materials. Compared with traditional solutions, the use of optical scanning systems such as galvanometers and lenses brings many advantages: high level of dynamic performance and processing speed; elimination of mechanical tool wear; non-contact processing; small and precisely defined thermal Area of ​​influence; unique flexibility, no need for finishing, etc. Laser marking processing is one of the most important enginee...

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Problems solved by technology

[0004] Laser processing on three-dimensional surfaces includes research on three-dimensional laser welding, material surface heat treatment, etc. They focus on the physical effects after laser processing, which is similar to the aforementioned internal cutting method; There is no research report on the surface laser marking process, whether domestic or foreign.

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