Abstract
Temperature distribution and heat partition have a significant impact on tool life and machined surface integrity in metal cutting process. In this work, the concept of non-uniform heat partition of the shear heat source on the shear plane was proposed, and an improved cutting thermal model was proposed based on this concept. The improved thermal model had a continuous temperature field at the shear plane compared with the previous thermal model. Comparing the thermal model before and after improvement with the finite element model (FEM), it was found that the temperature distribution of the improved thermal model was closer to the FEM. In addition, a calculation method for the heat partition coefficient of the shear heat source considering mass transfer and the ratio of the heat flow entering workpiece, chip and tool to the total heat generated during the cutting process were proposed based on the improved thermal model. The results were compared with the regression models proposed before, and showed that the shear angle is an indispensable factor for analyzing the heat flow in the cutting process when the thermophysical properties of workpiece remain unchanged.
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