| In order to improve processing efficiency and processing quality in NC milling process, ball-end toolpath generation algorithm and optimization of cutting parameters are studied through a method based on theoretical analysis with experimental verification. This thesis proposes some solutions to toolpath planning and cutting parameters optimization. The main contributions may be summarized as follows:(1) In the research of tool path generation algorithm, the advantages and disadvantages of various toolpath generation algorithms are analyzed to propose ball-end toolpath generation algorithm.(2) Ball-end toolpath generation algorithm based on isometric cross-sectional plane is proposed. In allusion to existing the question of interference in the machining process, the calculation of value of interference is given and the interference of toolpath is eliminated, which effectively improve the surface quality.(3) In the aspect of cutting parameters optimization, genetic algorithm is used for optimizing the cutting parameters. The optimization model of cutting parameters based on minimum production cost and minimum production time as the objective function are deduced and established. The basis of the known processing information, the veracity of the algorithm is validated though the analysis and the contrast between the fact and the optimum results.(4) Toolpath visualization simulation system is developed based on VC++ 6.0 with OpenGL. Through the processing instance, the toolpath generation algorithm was verified. In order to achieve toolpath simulation, the system achieves the functions of reading surface data, achieveing toolpath and detecting toolpath interference.In the thesis, the toolpath generation algorithm based on isometric cross-sectional plane is proposed and cutting parameters are optimized to reduce the machine processing time and improve the processing efficiency, which is important to improve the productivity of machine tool. |
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