Regular Article 

Investigation of sheet bending parameters on springback in nickel coated mild steel sheets using response surface methodology

¹ Department of Mechanical Engineering, Vickram College of Engineering, Sivagangai 630561, Tamil Nadu, India
² Department of Mechanical Engineering, V V College of Engineering, Tisaiyanvilai 627657, Tamil Nadu, India

^* e-mail: dpritima22@gmail.com

Received: 8 December 2017
Accepted: 22 January 2018

Abstract

Springback is the geometric change during forming process and it affects the dimensional accuracy of a finished product. This study aims to analyse the issue of springback in sheet bending by using response surface methodology (RSM). The effect of punch travel (d), strain hardening index (n), holding time (t), punch velocity (v) and width of the sheet (w) on the springback was explained by contour plots. The experiments were designed as per Centre Composite design and also linear and quadratic polynomial equations were used for developing the mathematical model. The experimental results of the punch travel, velocity, width of the sheets increased which increases the springback. The holding time increases when the springback decreases. ANOVA analysis was used to identify the most significant factor which affects the springback and it indicates that the springback is inversely proportional to the holding time and the springback is directly proportional to the width of the sheets. The results of scanning electron microscope (SEM) and energy dispersive analysis of X rays analysis for the nickel coated mild steel were also reported.