Comparative Analysis for Hard Turning of Cryogenically Treated and Non Treated EN8 Steel by Using TNMG 160408 Insert

International Journal of Mechanical Engineering
© 2018 by SSRG - IJME Journal
Volume 5 Issue 5
Year of Publication : 2018
Authors : Kazi Razaul Aarefeen, N.A. Kadam
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Kazi Razaul Aarefeen, N.A. Kadam, "Comparative Analysis for Hard Turning of Cryogenically Treated and Non Treated EN8 Steel by Using TNMG 160408 Insert," SSRG International Journal of Mechanical Engineering, vol. 5,  no. 5, pp. 40-48, 2018. Crossref, https://doi.org/10.14445/23488360/IJME-V5I5P107

Abstract:

En8 steel is the most commonly used steel in applications like gears, bolts, pins, studs, etc. These applications of En8 material require it to be readily machinable and, at the same time, possess a sufficiently high amount of hardness and strength. A conventional heat treatment process used to enhance the mechanical properties of En8 steel consists of quenching and tempering. Cryogenic processing consists of quenching the material, then treating it at a temperature as low as –193°C, followed by material tempering. Turning is becoming more popular for hardened steels as it has several benefits over grinding. The hard-turning process is defined as machining the work material having a hardness greater than 45 H.R.C. PCBN or hardened inserts are dominant tool materials for hard turning applications due to their high hardness, high wear resistance, and high thermal stability. Compared to grinding operations, hard turning has higher material removal rates, the possibility of greater process flexibility and lower energy consumption. The objective of the present work is to compare the results obtained by cyo-treated and non treated workpiece and to establish a correlation between cutting parameters such as cutting speed, feed rate and depth of cut with machining force, material removal rate and surface roughness on both cryo- treated and non treated EN8 workpieces. The TNMG inserts with a chamfer edge profile are used for turning. It is found that the use of lower feed value, lower Depth of cut with the cutting speed 135 and 180 m/min ensures minimum cutting forces, surface roughness and high M.R.R. 235m/min, 0.2 mm/rev, and 0.5 mm is the optimum parameter obtained by Grey Relational Analysis.

Keywords:

EN8 Steel, Cryogenic treatment, Material Removal Rate (M.R.R.), Force Measurement, Surface Roughness, Response Surface Methodology (R.S.M.), Grey Relational Analysis. (G.R.A.)

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