The effects of deep cold rolling and low plasticity burnishing process on surface hardness of AISI 4140 steel

Prabhu, P R and Kulkarni, S M and Sharma , S S (2011) The effects of deep cold rolling and low plasticity burnishing process on surface hardness of AISI 4140 steel. In: National Conference on Advances in Mechanical Engineering, 03 – 05 January, MIT Manipal.

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Abstract

Deep cold rolling (DCR) and low plasticity burnishing (LPB) process are cold working processes, which easily produce a smooth and work-hardened surface by plastic deformation of surface irregularities. The present work focuses on the surface hardness aspects of AISI 4140 work material, using fractional factorial design of experiments. The assessment of the surface hardness on work material was done, in order to identify the predominant factors amongst the selected parameters. They were then categorized in order of significance followed by setting the levels of the factors for maximizing surface hardness. In the present work, the influence of main process parameters (force, feed rate, number of tool passes/overruns, initial roughness of the work piece, ball material, ball diameter and lubricant used) on the surface hardness of AISI 4140 steel were investigated for both LPB and DCR process and the experimental results are compared with the predicted values. The results show that LPB process improves the surface hardness by 167% and DCR process improves the surface hardness by 442%. It is observed that the predicted results were quite close to the experimental results. It was also found that the force, ball diameter, number of tool passes and initial roughness of the workpiece are the most pronounced parameters, which has a significant effect on the work piece’s surface during deep cold rolling and low plasticity burnishing process.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Deep cold rolling, burnishing, surface hardness, design of experiments, AISI 4140 steel
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 14 Mar 2013 11:29
Last Modified: 18 Mar 2013 09:54
URI: http://eprints.manipal.edu/id/eprint/79025

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