On-Line Optimization of Cutting Conditions for NC Machining

This paper discusses a number of discrete models used for optimization of cutting condition during NC machining. The models can be broadly placed into two categories: 1. volumetric models in which feedrate is proportional to either average or instantaneous volumetric removal rate, 2. vector force models in which feedrate is set to values which keep either average or instantaneous cutting forces to prescribed values. While the latter models are more accurate they are also more difficult to implement on the shop floor. Our research investigates the practical application of these models and compares their trade-offs. A realistic example of the machining of a complex sculptured surface mold with widely varying cutting conditions is presented.