The Research Of The Optimization Technology And System Simulation Of Numerical Control

The technology of numerical control (NC) is a kind of modern automatic control technology, it is a kind of methods of the control of machine tools which have been realized by using the digital information, is one of the most crucial link in modern production technology. The interpolation technology of NC, which function is good or bad directly influence the processing quality of equipment, is the crucial technology in the system of NC. The graphical emulation technology of NC is also one of the most crucial technology, which has very important influence to entire system of NC.The interpolation technology of NC has focused on simple curve such as line, arc and parabola for long time, but as NURBS curve has been used widely in CAD/CAM, new NURBS curve interpolation technology has been brought forward and became one of key technologies stage by stage. At the present time, NURBS curve interpolation algorithms can meet the need of production in certain extent, but they have theirs defect. For example, the interpolation algorithm based on constant parameter space can guarantee interpolated precision, but cannot guarantee machining speed. And the interpolation algorithm based on constant track space can guarantee machining speed, but cannot guarantee interpolated precision.Because the graphical emulation technology of NC based on the interpolation algorithm, different interpolation algorithm bring different graphical emulation technology. When the real-time capability of the algorithm is very strong, we can use high-reality emulation technology; and when the real-time capability of the algorithm isn't very strong, we have to use low-reality emulation technology, such as line drawing.In this thesis, firstly, has studied the two most important technologies in the open NC system based on PC: Interpolation technical and graphical emulation technology. Then put a high value on NURBS curve directly interpolation technology, has analysed the insufficient places of current interpolation algorithms, and gave a improving algorithm. Because the complicacy of improving algorithm, this thesis also gave the real-time optimization on improving algorithm from three angles and compared these algorithms in experimental. Finally, this thesis has studied that the graphical emulation technology of NC system, and focus point is the generation algorithm of NURBS scanning body based on entity model technology.