Improving the Efficiency of the Cutting Tools Made of Mixed Ceramics by Applying Modifying Nanoscale Multilayered Coatings

Abstract

The paper studies the influence of properties of a tool made of mixed ceramic by applying modifying with nanoscale multi-layered coatings on machinability of hardened tool steel XVG. The paper also examines the influence of cutting speed on wear resistance of mixed ceramic with nanoscale multilayered coatings. The mathematical models that found out the dependence of tool life of a ceramic tool with coating from cutting speed were developed.

Development and research of vacuum-plasma composite coatings for increase of operability of shearing dies

“…Depending on technological conditions of the shearing stamp process and on operating loads, there may be different fracture mechanisms and failure modes of the punch and the die -adhesive and abrasive wear, chipping of the work surfaces, tempering of a thin surface layer and an intense pickup of deformable material on the operating surface of the tool [4,5].…”

Nano-scale multi-layered coatings for improved efficiency of ceramic cutting tools

“…The most probable mechanism of failure of a ceramic tool is brittle fracture of cutting wedge [1][2][3][4][12][13][14][15]. This occurs because of the lower brittle strength of the ceramic tool material as a b compared with the corresponding characteristics for carbide material.…”

“…Thus allowing a control of contact processes in order to change thermomechanical strain of the cutting edges and the nature of wear. This is connected with the phenomenological dual role of coating, which is manifested in the improvement of the surface properties of the ceramic material to reduce thermomechanical effect on the tool contact areas during cutting while providing high adhesion strength with the ceramic substrate [9][10][11][12][13]. In this respect, large-scale studies are currently undertaken to improve the properties of cutting ceramic through deposition of functional coatings.…”

“…Therefore, ceramic tools are very sensitive to thermal cycling loads and are characterized by an increased tendency to micro/macro-brittle failure at contact stresses higher than 900-1000 MPa, which predetermines the very narrow scope of application (K01-K10, P01-P10) [1,3]. An effective method for overall improvement of physical and mechanical properties of cutting ceramic is the deposition of modifying functional coatings on the working surfaces [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Thus allowing a control of contact processes in order to change thermomechanical strain of the cutting edges and the nature of wear.…”

Study of electrical discharge machining for the parts of nuclear industry usage

“…When applying electrical discharge machining to the item, one must consider the following tasks: the need to produce the parts in one pass-through of a charged wire; the need to develop a processing method and the size of the discharge gap for the non-standard material [6]; the need to develop special devices and clamping mechanisms for placement and fixation of the work piece on the working table in order to reduce the possible item warp during the machining and other side effects.…”