An analytical evaluation of the cutting forces in orthogonal cutting using a dynamic model of the shear zone with parallel boundaries

摘要

A shear zone model with parallel boundaries is used to evaluate the dynamic cutting forces inorthogonal cutting. The cutting system was modeled using a single degree-of-freedom dynamicsystem where the variations of the cutting forces are represented by their total differentials. Theinfluence of temperature on the flow shear stress of workpiece material is accounted for. Theexperimental verification of the proposed model was performed using a two-component piezoelectricdynamometer and adopting the rotating cutting tool-stationary workpiece procedure. Thedynamometer was calibrated for static and dynamic outputs and techniques were employed forincreasing the measurement accuracy and reducing cross-influence by obtaining the elements oftransfer and coherent functions. Experiments were carried out to measure the dynamic fluctuationsof the force components. The experimental results show good agreement with the theoreticalevaluations of the cutting force components.