Abstract
After giving a brief explanation of the difference between "predictive" and "descriptive" theories in metal cutting, two examples of representative "predictive" theories of orthogonal cutting are presented. The predicted or experimentally obtained data of orthogonal cutting may be applied under some assumptions to predict three-dimensional cutting performance, although plastic flow in the cutting is not the flow in plane strain. This type of theory is then discussed since it appears only the practical approach at present. Besides the predictions mentioned above, machining troubles such as chatter vibration and cutting tool failure must be also predicted in order to obtain optimum cutting conditions for a given operation. These problems of prediction sre also reviewed in some detail. Finally, it is pointed out that an expert system using nonalgorithmic artificisl intelligence is indispens able at present in order to complement and utilize our metal cutting theories in practical problems such as determination of optimum cutting conditions.
