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在二维切削加工系统切削过程动刚度研究的基础上，通过对三维切削加工系统动力学模型的理论分析，给出了三维切削动刚度及动态切削力系数的解析表达式。
Based on the research of dynamic stiffness of cutting process in two-dimensional cutting system, the analytical expression of dynamic stiffness and dynamic cutting force coefficient of three-dimensional cutting is given by theoretical analysis of the dynamic model of three-dimensional cutting system.