Surface Hardness Improvement Using Stiff Ball Burnishing
Abstract
This paper investigates the effect of stiff ball burnishing
parameters (speed, feed, depth of penetration and number of passes)
on surface hardness of Titanium alloy using response surface
methodology (RSM). A quadratic regression model was developed
using RSM with central composite design (CCD). The surface micro
hardness values confirms the experimental values at the optimal
combination of burnishing parameters given by the predicted model.
Number of passes and combination of feed and depth of penetration
plays a vital role in improving surface hardness of the material. At
900 rpm speed, 300 mm/min feed, 0.5μmdepth of penetration and
number of passes 3, we got maximum surface hardness. The
percentage increase in surface hardness was about 8 to 12%.
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