The Research On Control System Software Of Laser Cutting Machine And Its Development

IILaser was the most important invention of the last century. In the last twenty years, it was more and more used in the industry field and reached boom period. Laser cutting technology is a chief element of laser machining technology. As request of high-speed and high-accuracy, laser cutting machine is developing in the direction of numerical control cutting machine.For the demand of neotype laser cutting machine, that is, to develop a laser cutting numerical control system with high-efficiency and high-accuracy, the laser cutting machine in this project uses dual galvanometer scanning system and two-dimentional linear motion actuator workbench to realize combination of workbench movement and galvanometer scanning movement, which not only advances the cutting speed and accuracy, but also obtains large range of work. The control system reads the Gerber files, distills working information, graphically displays the cutting path lines, enables the user select cutting trace mutually, does the cutting and dynamically display the cutting process. The main work of the article is developing the motion control part of the laser cutting control system software,doing the part automatic location and part deformation compensation, and compensating the galvanometer's scanning geometry distortion.Firstly, the article constructs the motion control system based on the laser galvanometer motion controller, coordinately controls the working table, galvanometers and the laser to implement high-quality cutting of the part. The software system is developed in VC++6.0 and packages library functions provided by the controller to realize certain functions,such as sending motion instructions, monitoring the system state and displaying moving parameters, and so on.Secondly, because the parts of this cutting system are generally Flexible Printed Circuit Board which has characteristics of liable to deformation and having no special clamp when machining, it is necessary to do the part auto location and part deformation compensation in the motion control software module. The article uses the center points of mark holes on the part as reference and uses CCD imaging to obtain the real position and deformation of the part, and then applies projective transformation method to implement the part automatic location and part deformation correction. The procedure realizes the precise location of the part and improves the working accuracy. Thirdly, dual galvanometer scanning system is used in the machine. This kind of system has high accuracy and high efficiency, but also has shortcoming of galvanometer's scanning geometry distortion. The article discusses the reason of the distortion and it's correcting principle, proposes suitable compensation method and experiment, and eventually obtain satisfying compensation result.