The Study Wear Resistance of the Modified Surface of the Cutting Tool

Abstract

One of the effective ways to improve the efficiency of cutting tools is the use of innovative types of multilayer coatings combining friction properties and high wear resistance. The object of study of this work was to investigate the influence of the composition of sublayer with anti-friction properties like component functional multilayer coatings on tool life. The data obtained in these studies were the basis for the development of the concept of functional multilayer coatings for cutting tools with programmable properties, providing an opportunity for each coating layer to perform a required function at a certain stage of tool wear. As used HSS substrate which is preliminarily subjected to ion nitriding by glow discharge and in addition alloyed gas-metal ions before coating deposition. The final step involved coating deposition process TiCrN using filtered cathodic vacuum arc deposition (FCVAD). Studies have shown that mixing the antifriction alloys which are widely used to improve friction properties allow to increase the tool life is not more than two times. This method of the tool life increase by reducing the shear strength of boundary adhesion between the tool and the work material does not seem to be the most effective for multilayered coatings under analysis, as for almost all studied anti-friction materials, the adhesion between the coating and the modified surface was rather low. This precludes their practical application due to technological reasons. Implantation the chemical elements can achieve much better results. Elements such as indium, silver and nitrogen increase tool life in 2 - 3 times for different cutting conditions (using dry cutting or cutting with cutting fluid). The obtained results can be considered as the most promising. Indium and silver are interactive with respect to Fe and may be used as lubricants in metal and promote a crushed chip forming at cutting using coating under the study. Ion surface modification of the tool with other studied elements demonstrates unstable or negative results that reduction in tool life or inability to provide good adhesion between the coating and substrate.