Research On The Key Technologies And Prototype Development Of CNC Turn-mill Machining Simulation System

Turn-milling center is a new generation of high-end CNC equipment that has high efficiency and high precision advantage in complex parts manufacturing. Although the technology of turn-milling complex machine has developed 20 years, turn-milling CNC equipment utilization is not high and a lot of turn-milling centers are only used as a lathe CNC. To this end, a turn-milling complex machining simulation system can test the NC program. In this paper, the key technologies of turn-milling complex machine simulation system are studied and the prototype system is developed that realize the developing of turn-milling complex machining simulation software. The main contents and results are as follows:Firstly, according to features of NC code for turn-milling complex machine, a compiler for turn-milling complex CNC system is designed. The compiler is developed by Visual C + + software and loading GRETA regular expression classes which accelerate the compilation speed and efficiency as match and analysis tools. The compiler can read, test and decoding the NC program and provides accurate tool location information data for the processing simulation.Secondly, the formula for tool point and axis vector are derived based on the tool movement features in five-axis turn-milling machine. The material removal point for turning is determined by tool point and the discrete intersection. The milling material removal method is: the tool model is established ; according to the principle of tool swept envelope, the tool swept surface equation is obtained by using display expression of tool swept surface; using the intersection of tool swept volume and discrete parts to achieve the point determine of material removal. To achieve drilling material removal algorithm, the range of drilling material removal is fond according to drilling trajectory. Meanwhile, the principles of motion simulation, discrete methods on interpolation are also been studied to achieve the motion simulation.Thirdly, through the research on technology and theory of synchronous processing in turn-milling machine, five synchronized strategies which are synchronous cylindrical turning, synchronous face turning, synchronous cylindrical turning and drilling/boring, synchronous milling and synchronous radial drilling have put forward. Meanwhile, the impact of synchronous processing strategies on process parameters and machining accuracy are researched. Also, the overall and the local process planning are designed for synchronous processing for the synchronization process.Finally, based on the results of these studies, a prototype system of turn-milling complex process simulation system is developed by using Visual C + + software and OpenGL graphics tools. The prototype system can realize the operation of NC code (read, verify, decode, modify), the selection on parameters of rough model, the transformation of workpiece model (move, rotate, zoom), process simulation, synchronous processing and other operations.