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Higher quality requirements and lower production time are the main thrust behind the development of tool path optimization approach. In this paper, a new NC code optimization system based on virtual manufacturing technology is proposed, which includes three key modules: geometric simulation, physical simulation and NC code optimization. In the geometric simulation module, a general and extensible NC code parsing framework is built and space partitioning modeling approach with voxels is employed to extract cutting parameters in instantaneous machining. While in the physical simulation module, a database recording pre-calibrated cutting force models is established and machining mechanics are predicted. Finally, NC codes are optimized by scheduling the values of feedrate and spindle speed which targets at constant cutting forces and less machining time. Later experiments illustrate that after multi-criteria optimization, the fluctuation of cutting force is reduced and efficiency is improved, which well demonstrates the feasibility and effectiveness of the system.
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