Research On Multicolor Laser Scanning Projection System And Path Optimization Method

The laser scanning technology can project the image defined by CAD model with a high-speed scanning galvanometer to deflect the light emitted from a laser.The technicians can effectively solve the problems of low assembly efficiency and low accuracy by replacing the traditional method with the method of using laser scanning to project the outline frame.Laser scanning projection systems are widely used in the precision manufacturing and assembly of large-size components such as aircraft,ships and automobiles.In order to study a new method that can realize the extraction of feature primitives and can generate projection files automatically,and to develop a new multi-color laser scanning projection system that can directly drive projection through digital and analog files,furthermore can realize layered projection assistance for different processes and procedures,the specific research work is as follows:Firstly,analyzed the shortcomings of the existing laser scanning projection technology and areas for improvement.Proposed a new multi-color laser scanning projection system which can recognize the Initialized Graphic Exchange Specification(IGES)files and can be layered projected,moreover,can design this multi-color laser scanning projection system.Then,analyzed the solid types including B-spline curves in IGES files.Based on this,the method of scanning projection coordinate extraction of IGES file and generating a two-dimensional galvanometer scanning driving file are proposed.Finally,the collimateing and focusing optical systems were designed in turn.Derived the corresponding mathematical model,simulation verification was performed using ZEMAX.A new multi-color laser scanning projection system was established,and the above-mentioned research method was verified by the projection system.At the same time,the deviation of the projection graphics was analyzed,and the inverse B-spline curve method was used to optimize the time compensation of the projection path.Based on this,a better projection graphics optimization and compensation effect was obtained.The experimental results show that the developed projection system can directly identify IGES files including primitive features such as straight lines,polygons,circles,and B-spline curves.This method can realize the clear projection of all picture elements and the main laser contour line width is better than 0.4mm,and the full band is better than 0.7mm.The studied feature pixel extraction,projection file generation method and the new multi-color laser scanning projection system can effectively enhance the practical engineering application value of laser scanning projection instruments,and can improve the actual assembly production efficiency.Also,it can reduce the error rate.In the future,this projection system can be applied to the precision manufacturing and assembly fields of aircraft,ships and automobiles.