Design Of Control System Software For Laser Micromachining Seven-five Axis Machine

With the development of national defense, aerospace, medical and biological engineering and other aspects, micro-machining has become one of the most active research manufacturing today and laser micro-processing technology has increasingly shown its unique advantages. By using a five-axis machine and laser galvanometer scanning system consisting of complex laser processing equipment, any complex 3D laser surface micromachining can be implemented, improving the machining accuracy and quality.3D laser micro-machining technology, basing on the high-energy of lasers and 2D galvanometer scanning system which replaces the traditional mechanical processing tools, realizes 3D coordinate positioning by five-axis machines to achieve laser ablation on any complex surfaces. It makes up the precision and quality deficiencies of traditional machining. In order to implement a seven-five axis control system for the laser micromachining of any complex surface, the main contents are as follows:(1) According to the needs of 3D laser micromachining control system, a seven-five axis(5 + 2) machining system is realized by combining five-axis machine equipment and 2D galvanometer scanning system. By analyzing the structure of the CNC system, hardware architecture and software architecture of laser micromachining system are designed. Meanwhile, the hardware abstraction interface enhances the system scalability.(2) Through analysis of seven-five axis machine, the seven-five axis kinematics model is simplify to two turntable five-axis model. The link model of coordinate system is established by the relation of workpiece and machine coordinate systems. The optimal rotation angle is obtained by solving kinematic equations with translation and rotation.(3) The laser and galvanometer control module, motion control module, graphics module, processing and display module of control system software are designed, function divided and implemented. Hardware abstraction interfaces are designed and realized, optimizing the system hierarchy. 3D laser processing is realized by the two-dimensional galvanometer control and five-axis machine motion control in the end.(4) Analyzing the laser micromachining control system, main machine geometry errors are measured and modeled, a compensation is established. A variety of ablation experiments are performed on curve surfaces to examine the functionality and accuracy. Results show that the 3D micro-machining system can accurately position, ensuring that the processing position is always in the depth of focus with graphics’ splicing error within 20μm.