Technological aspects of wear-resistant coating treatment on the surface of a cutting tool

Abstract

It is known that the idea of creating a layered nanocomposite from the highly hard phases Al2O3, ZrN, TiC, Zr (C, N), Ti-Zr-C, TiB2 is one of the recognized directions for solving the problem of thermomechanical wear of metalworking tools [1–4]. Thus, laminated composite materials have shown themselves to be efficient under complex loading conditions on other mechanical engineering products [3–7] and have firmly strengthened their positions in production. With a correct analysis of the operating conditions of the product, whether it is a part or a cutting tool, in particular a band saw blade, it can be found that this or that zone or layer can work for a specific type of loading. Consequently, it can be made from a material with characteristics that meet the given loading conditions. Thus, based on the analysis of the loading conditions during the operation of the band saw blade, the idea of a bimetallic saw was proposed, which is the correct way to solve the arising problem, but the main disadvantage is the presence of a welded joint sensitive to vibration, dynamic and shock loads, as well as the difficulty of obtaining a defect-free welded seam, which is also complicated by the criterion of weldability of many materials with each other and in general. An alternative can be the application of a coating on their surface of saw tooth by the method of ion-magnetron sputtering, which allows to significantly change the physical and mechanical characteristics of the material of the cutting edge of the teeth (which will be the material of the entire band saw blade spring steel). At the same time, the output is a layered composite with high adhesion, comparable in value to the metallurgical one. Obtaining a coating by ion-magnetron sputtering, which allows spraying thin films and is currently the most optimal technology for obtaining coatings on cutting tools, both in terms of adhesion and the resulting structure of the sprayed nanostructured coating [4].