Mechanistic modeling of oblique cutting considering fracture toughness and thermo-mechanical properties

The cutting force modeling is crucial for analyzing and understanding internal mechanism of machining process. In this paper, an oblique model considering the fracture toughness and thermo-mechanical properties is presented. The fracture toughness is introduced to describe the power spent in the formation of the new surfaces. Meanwhile, a modified partition factor model which integrates the Weiner's partition analysis and Jaeger's friction slider solution is proposed to describe the fraction of the shear plane energy conducted back into the chip so as to calculate the temperature at the shear plane accurately. To testify the correctness of the proposed model, 27 cutting data are carried out within a wide range of cutting conditions. The results show that the proposed model can reflect the mechanistic characteristics of the machining process accurately and agree fairly well with experimental measurements.