| Among all the CAD/CAM technologies, Numerical Control (NC) Machining gives the most direct and obvious benefits. With the complexity of parts-manufacture upgrading and the techniques of NC machining developing, the NC machining programming becomes more and more complicated, so the validity for it becomes urgent. Graphics Simulation technology in NC machining is a powerful tool for validating NC machining programming, which using the computer graphical output to simulate the real machining process. Compared with the traditional methods, the application of this technology makes the cost lower and the efficiency higher in products manufacture.Based on the existing achievements, some research and amelioration were done on some pivotal algorithms which used in 3-axis NC milling machining graphical simulation, especially on the geometrical representation on NC graphics simulation process and part-redraw algorithm. Also a 3-axis milling numerical control graphical simulation prototype system is implemented based on these algorithms.All the research and achievement sums up as follows:1.A geometric model suitable for 3-axis milling NC machining graphical simulation system is established. Based on the feature of Z-MAP model and the 3-axis milling NC machining, a enhanced Z-MAP method is introduce to represent the workpiece,and formation of different cutter sweep plane together with calculation of workpiece model cutter is studied.2. A fast display algorithm for 3-axis NC milling machining graphical simulation is researched and realized. In order to balance the simulation velocity and simulation accuracy, after sufficiently research OpenGL display mechanism, based on the feature of 3-axis NC milling machining, fast location algorithm of workpiece model part display area is designed and the fast display of figure NC process based on the stencil buffer technique is implemented. The algorithm greatly lowers the time complexity and performs fast at very high simulation accuracy. |
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