基于金属切削中的“最小能量原理” ,研究了非自由切削的基本特征 ,探讨了现代切削加工中普遍存在的排屑干涉和排屑协调的现象与规律 ,提出以“单元刀具综合法”来建立复杂刀具的切削模型 ,并由此导出了制约排屑运动的普遍方程 .分析了非自由切削的实例 ,理论分析与预测的结果得到实验数据和事实的验证 .还得出了消除排屑干涉 ,实现自由切削的充要条件 ,并论述了“自由切削法”的基本思想和技术路线 ,为现代刀具的改进与优化寻求到一个可行的途径 . Based on “the principle of least energy” in metal cutting, the basic characteristics of non-free cutting are studied, the phenomena and regularities of chip-cutting interference and chip evacuation coordination that are common in modern cutting are discussed, and the “unit tool synthesis method” The cutting model of complex cutting tools is established and the general equations governing the chip removal motion are deduced.The examples of non-free cutting are analyzed.The results of theoretical analysis and prediction are verified by the experimental data and facts.It is also concluded that the chip removal interference , To realize the necessary and sufficient conditions of free cutting, and expounds the basic idea and technical route of “free cutting method”, and finds a feasible way for the improvement and optimization of modern cutting tools.