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RESEARCH PRODUCT

Heat in Metal Cutting

subject

description

This chapter provides comprehensive knowledge regarding thermal effects during the cutting process with both uncoated and coated cutting tools. Main heat sources and flowing heat fluxes into the tool, chip and workpiece are characterized and quantified. The heat distribution models that allow the analytical prediction of heat partition between the tool and the chip are specified. They consider such thermal properties as specific heat, thermal conductivity and diffusivity, Peclet thermal number, and heat transmission ratio, all as functions of temperature. Finite element method and finite difference method simulations applied to the prediction of temperature fields are outlined for turning and milling operations of different machined materials, including steels and titanium alloys. Some examples of temperature fields for turning and milling operations using uncoated and coated cutting tools are presented. The methods of improving thermal stability of cutting tools are presented. In particular, the effective use of multilayer coatings with an intermediate ceramic layer causes the heat isolation effect which protects the cutting tool against excessive heating is discussed. The classification and practical applications of temperature measurement techniques are presented.