Research & Development Of Teaching Simulation System For NC Programme Experiment

With numerical control technology developing, NC machine tools as a kind of mechanical and electrical products are widely applied in the field of machine manufacture. But because of NC machine's high cost and the breakage to NC machine by wrong operation in using it, many universities hardly buy enough NC machines for NC teaching. Besides, 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.This system is divided to two parts by structure, one is hardware structure, the other is software structure. By function, hardware is divided to control message input module and communication module, software is divided to show module and background process, which is also subdivided to interpolation module, tool compensation module, NC program coding module, NC process simulation module and system interface function module.The whole structure of this system is built, and the means of implement that inputting system control messages and communication module are introduced importantly.The arithmetic of linear and arc interpolation is implemented, and the arithmetic of tool compensation is talked about particularly.The way of compiling control coding is adopted, and coding data process flow is analyzed detailed, while some relevant problems such as modal instrument procession are introduced.The implemental means of NC cutting procession simulation are researched. The conception of the object-space separating modeling technique based on the triangular grids 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 interpolation and tool compensation arithmetic are validated by examples.