Title: Process parameters optimisation and coatings influence on the surface quality during turning of AISI 202 austenitic stainless steel

Authors: M. Kaladhar; K. Venkata Subbaiah; Ch. Srinivasa Rao; K. Narayana Rao

Addresses: Department of Mechanical Engineering, Praveenya Marine Engineering College, Modavalasa Visakhapatnam, Andhra Pradesh – 531162, India. ' Department of Mechanical Engineering, Andhra University, Visakhapatnam, Andhra Pradesh – 530003, India. ' Department of Mechanical Engineering, Andhra University, Visakhapatnam, Andhra Pradesh – 530003, India. ' Department of Mechanical Engineering, Government Polytechnic, Visakhapatnam, Andhra Pradesh – 530003, India

Abstract: The aim of the present study is to investigate the effects of physical vapour deposition (PVD) and chemical vapour deposition (CVD) coated cemented carbide inserts on the surface quality of work piece. In the present work, AISI 202 austenitic stainless steel work pieces are turned on computer numerical controlled (CNC) lathe by using CVD coated insert [Ti(C, N) + Al₂O₃], PVD coated insert [(Ti, Al) N + TiN] of 0.4 and 0.8 mm nose radii of each. The effect of coating method and change in process parameters on the work piece surface roughness has been investigated. In order to produce any product with desired quality by machining, process parameters should be selected properly. To achieve this, the experimental investigations are executed on Taguchi's design of experiments (DOE) approach to analyse the effect of process parameters on surface roughness and to obtain the optimal setting of these process parameters. The analysis of variance (ANOVA) is also used to analyse the influence of process parameters during turning. The results are shown that the improvement in average surface finish is obtained when machining with CVD coated insert (1.474 µm). The feed and nose radius are the most significant process parameters. Optimal range of surface roughness is also predicted. And the optimal level of parameters is obtained for optimum value surface roughness when turning with PVD and CVD insert.

Keywords: PVD coated inserts; CVD coated inserts; surface roughness; AISI 202 austenitic stainless steel; Taguchi methods; analysis of variance; ANOVA; process parameters; parameter optimisation; surface quality; physical vapour deposition; chemical vapour deposition; cemented carbide inserts; CNC turning; design of experiments; DOE.

DOI: 10.1504/IJMMM.2012.047832

International Journal of Machining and Machinability of Materials, 2012 Vol.11 No.4, pp.371 - 384

Received: 10 Dec 2010
Accepted: 11 Mar 2011
Published online: 23 Aug 2014 *

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