Research And Development On Laser Cutting System Using Galvanometer

The laser cutting technique plays an important role in laser cutting industry, which is the earliest and widely used. Comparing with other cutting ways, the laser cutting method has higher accuracy and speed features which make it widely used in the manufacturing industry and research, and has the extensive development prospect. To promote NC programming theory and its applications, several key technologies for laser cutting are systematically studied and implemented in this thesis.According to the features of workbench and galvanometer in the Laser cutting machining, the paper discusses the integrated structure of laser machine for the large area. And with the features of large area Gerber file, the structure and the processing steps of the information have also been discussed. The proposed method not only enlarges the processing area, but also insures the high speed and accuracy in the cutting processes.Based on the analysis of software demand and the function module of laser cutting, the architecture of the software for laser cutting using galvanometer is studied. A design method of grid is presented by studying the technique of toolpath cutting. The proposed method improves the dividing efficiency. A method of discreting lines is also implemented to reduce the distortion of galvanometer.For the extraction of the object boundary profile, a novel two-stage extracting method of boundary edge based on sequence points is proposed. The initial outlines are firstly obtained by the relationship of object and its sequence points. And then precise profile which is the toolpath of laser cutting is achieved through the intersection of the initial edge. To reduce retract motion, a suboptimal search algorithm is proposed to complete toolpath optimization. In the method, the nearest end point from base one is searched in the toolpath list in company with considering the cutting times and the relationship of boundary edges by connecting the two points. The optimized toolpath improves the laser cutting efficiency.At last, on the basis of above mentioned research work and achievements, a laser cutting NC automatic programming prototype system is developed, the experimental NC machining results demonstrate the feasibility of the proposed methods.