TRIBOTECHNICAL PARAMETERS OF FRICTION BETWEEN A COATED CUTTING TOOL AND MATERIAL BEING MACHINED
Tribological parameters of the frictional contact in the cutting tool material being machined are very important for choosing an optimal tool material and wear-resistant coating. The paper considers an experimental technique that allows experimentally simulating with a high degree of reliability the real conditions of friction and wear at the local contact of a tool and a workpiece in the cutting zone when exposed to the appropriate temperatures (400–800 °C). This technique makes it possible to determine parameters such as the strength n of adhesion bonds on the cut and the adhesion (molecular) component fM of the friction coefficient. Special equipment has been developed that makes it possible to heat the contact zone and provide a typical temperature distribution through the depth of the contacting bodies. The use of the described technique facilitated obtaining data on the influence of temperature on the tribotechnical properties of tribopairs of coated cutting tool material being machined for various grades of the material being machined and the coating compositions. These results were compared with the data of the corresponding cutting tests.
Keyword(s): Physical vapour deposition (PVD) coatings; coefficient of friction; tool life; thermo stability.
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