Influence of specially designed high-stiffness ball burnishing tool on surface quality of Titanium alloy

Abstract

This paper deals with effect of specially designed high stiffness ball burnishing tool on surface quality of the material. Main objective is to find optimum depth of penetration to achieve surface finish equivalent to high polish and to study effect of different burnishing parameters on surface roughness. Experimental investigations based on initial surface roughness, using response surface methodology with central composite design, were conducted to develop regression model for surface roughness. The effect of selected process parameters (speed, feed, depth of penetration and number of passes) on surface quality of the material was studied. The material used in the investigations was titanium alloy, which is widely used in aerospace industry. It is worth noting that high stiffness tool with depth of penetration approximately equal to Rp (Maximum peak height) gives surface finish equivalent to high polished surface. Authors proposes use of high stiffness tool instead of conventional elastic tool system.