INCREASING THE WEAR RESISTANCE OF HARD ALLOY CUTTING TOOLS BY CHEMICAL TREATMENT

Abstract

A method for increasing the wear resistance of ground cutting plates made from hard alloys T5K10 by chemical treatment (passivation) has been developed in order to create a solid surface layer of WC, (Ti,W)C carbides, which is firmly connected to the tool base, with a high-precision level of discreteness. During the chemical treatment, cobalt is partially removed from the surface layer of the tool with the formation of salts of refractory metals of cobalt, tungsten and titanium that are firmly adhered to the carbide skeleton of the alloy; these salts can serve as antifriction additives and slow down the process of chip material sticking to the cutting edge and forming the built-up edge. When cutting hardened steel with machined carbide plates, the energy of cutting is dissipated (scattered) by the destruction of many etched boundaries of the WC-WC surface and the formation of microcracks tangential to the surface