COMPARISON OF DIFFERENT COATINGS ON HIGH SPEED STEEL TOOL

Abstract

Abstract At present, high speed machining is the most promising approach to increase both efficiency and precision of metal cutting process. There are different types of cutting tools in use for machining various materials for the multiple operations in order to produce components. The manufacturers of these components expect to improve their productivity, quality of the components and longer life of the cutting tools. Quality and productivity play a vital role in present’s manufacturing market. Therefore, every manufacturing or production unit should concern about the quality of the product. Apart from quality, there exists another criterion, called productivity which is directly related to the profit level and also goodwill of the organization. The study aimed at evaluating the best process environment which could simultaneously satisfy requirements of both quality and as well as productivity with special emphasis on reduction of cutting tool flank wear. Because reduction in flank wear ensures increase in tool life. Traditional hard coatings, such as TiN, TiAlN, WC, TiC, Cermets etc played an important role in the development stage of new generation cutting tools in an attempt to improve the wear resistance of cutting and forming tools. The tool manufacturers also aims at producing quality tools to with stand for higher cutting forces, thermal resistivity with more wear resistance and to give longer life of the tool, to produce better surface finish product and maintain desired dimensional accuracies of the product. For the past several years the materials of the cutting tools are the same, but due to continuous improvements in enhancing the life of the cutting tools, different methods process are in progress for producing the tools. The cutting tool manufacturers with their rich R&D experience and continuous innovations, carrying on their production activity to meet the challenges of the market demand and it has been investigated by various researcher for improving their productivity, quality of the components and longer life of the cutting tools. In this project a new coating i.e. carbon nanotubes(CNT) coating deposited on HSS tool by Chemical vapor deposition (CVD) method and compared the results with as CNT coated HSS tool and non coated HSS tool at different cutting parameters such as depth of cut and feed rate on lathe machine with dynamometer. The changes in the microstructure, elemental composition and crystallographic phases of non coated and deposited coated tools pre-turning and post turning were examined using Scanning electron microscopy and e-dax test and comparative analysis of imparted forces such as Cutting force, feed force and axial thrust force has been done by the use Origin 2015 software. The results during dry turning of EN8 grade medium carbon steel with various cutting parameters with coated and non coated tools revealed that reduction in cutting force upto 32.315 % was observed