Research And Implementation Of Three-Dimension Dynamic Simulation System For The Manufacture Process Of Special Shape Screw Pole

All kinds of helical poles are extensively used in the fields of petroleum, chemical engineering and so on. However, the technology of manufacture about helical rotor is always the key problem, which blocks its development off Since 1994, the CNC Research Center in Shenyang University of Technology has pursued research on complex special helical pole. It firstly put forward the non-instantaneous pole envelope method in China, and pursued systemic research on the theory of envelope method and NC programming method, then acquired a lot of achievements. Therefore in this thesis the main job is the simulation model built on basis of non-instantaneous pole envelope method and the Three-Dimension graphic dynamic simulation system.Based on Object-Oriented analysis and design, this paper discussed the basic theory of computer graphics, visual simulation method, non-instantaneous pole envelope method about CNC machine and the Three-Dimension graphics modeling method. With triangle graphic element as the basic modeling tool we developed simulation system that CNC machine manufactured special shape screw pole. This paper emphatically researched the problem how to calculate the intersection point between workpiece that rotated with variational angle velocity and milling cutter that moved with complicated track and rotated with high speed. Furthermore it adopted the discrete curve surface method for every milling cutter, and treated image frame as the control parameter of position of milling cutter during the intersection calculation process, so the algorithm of intersection between workpiece and milling cutter was obtained.The paper also discussed further Three-Dimension graphic problem of manufacture process. It described the store rules of workpieces point, the organization rules of workpiece triangle and the rule definition of dynamically inserting points and deleting points in the process. Base on upwards algorithm,one suit of manufacture simulation models was built. Finally by use of C++ and OpenGL , the practical simulation system software has been developed , which makes control manufacture combined with the whole complex screw pole manufacture process such asparameter input, design and selection of milling cutter, interference judgement, interpolation computing, three-Dimension simulation and numeral code, in order for the guide of theory research and manufactural practice.