| With the quick development of science and technology, there are radical changes in the field of mechanical manufacture. The productive efficiency and quality of the product are improved greatly, with the wide use of NC technology. And this make the mechanical manufacture go into the flexibility and roboticized epoch.At present, the theory teaching plays an important role during the process of NC teaching and training in our country. There are few practice and operation training in NC course because of the high cost of the NC machine and the operation and the maintenance. Moreover, simplex NC simulation software is short of third dimension, so it can not meet the requirement of NC teaching well. For above reasons, we have developed a NC simulation system applying to NC teaching and training.This system is divided into two parts by structure,one is hardware structure, the other is system software. By function, hardware is divided into control message input and output module and communication module, system software is divided to show module and background process, which is also subdivided into tool track calculating module, NC program coding module, NC process simulation module and system interface function module.The hardware based on PIC single-chip are built, which contains inputting and outputting system control messages and communication module.The G code translating method is actualized. The way of compiling control coding is adopted, and coding data process flow is analyzed detailedly, while some relevant problems such as modal instrument procession are introduced. The arithmetic of linear and arc tool track is actualized.The implemental means of NC cutting procession simulation are researched. The conception of based on the triangular grids partition is introduced, and simplification calculation of the points of intersection between semi-finished material and cutting scanning body brings forward, which reduces calculation quantities in simulation, increases the speed of simulation and optimizes the effect of simulation. The function of system interface is introduced, and linear and arc tool track arithmetic is validated by examples.The developing platform of system is VC++6.0, and the NC codes in the system, which accord with standard NC system criterion is convenient and applied. |
