THERMOMECHANICAL MODELING OF CUTTING AND EXPERIMENTAL VALIDATION

摘要

An oblique cutting model, based on a simplified approach in which the chip is supposed to be formed in a thin band of constant thickness (the primary shear zone), has been developed. The thermomechanical analysis of the material flow within the primary shear zone is combined with a modelling of friction conditions at the tool-chip interface. The friction coefficient is assumed to be a decreasing function of mean temperature interface T-bar_(int). The predicted results of the cutting forces are in good agreement with those obtained from the experiments over a wide range of orthogonal cutting conditions (feed and cutting velocity). Although the proposed model was established for stationary conditions and for continuous chips, it gives acceptable predictions for different kinds of chip morphology.