Study On The Geometrical Simulation In NC Turning

Nowadays, in the process of checking against NC program automatically, the main research way is NC manufacturing graphics simulation. Because the resultant graph is third dimension, it can directly check the accuracy of NC program, also make NC programmer check collision and interference, verify NC program by the graphics display. Consequently, the NC graphic simulation is becoming a key technology in the CAD/CAM field.In the development of this simulation system, by utilizing the large CAD/CAM software Pro/E, the author create every part of NC machine, then assemble all these parts and set up the virtual manufacturing environment. Through converting it into OpenGL, we can manipulate the machine. In this process, we reduce a lot of computing problems, and realize the establishment of complex manufacturing enviroment.A visual method based on X_map has been proposed in this paper. It can be used to detect errors of NC programs visually from graphics display of process and result of NC manufacturing. When constructing a crude workpiece, at first this system divides dispersedly the workpiece into many cells, and every cell is made up of triangles net on the surfaces. Then, by the method based on X_map, the manufacturing simulation can be processed; by utilizing the technology of Double Buffer and Timer in OpenGL, the cutting process of workpiece can be simulated dynamically, collision and interference can be checked, and the result of manufacturing is visual, the resultant part can be measured.OpenGL is the 3D graphics library developed by SGI of America. Now it has become the open international standard of graphics. OpenGL is separated from hardware. windows. OS(Operating System). Based on the X_map algorithm, the operations of graphics are all realized in OpenGL. This system is realized in Windows2000 by using Visual C++.This system is convenient, practical, and because of low requirement for hardware and software, it accord with the situation of our country. In the meantime, its reality interaction and the ability of transfer are all very good.