AN EXPERIMENTAL INVESTIGATION AND PARAMETRIC OPTIMIZATION OF ROLLER BURNISHING PROCESS ON GUNMETAL BUSH by Pooja Khanna
The burnishing process is a type of chip-less finishing process in which the metal surface is lastically
deformed by rubbing the hardened material ball or rollers against the workpiece material. Most of the work in the past has been performed on ball burnishing and single roller burnishing. The ball burnishing process comes along with the limitation of feed which leads to longer cycle times. In case of ball burnishing, work piece of longer length could not be burnished as it bends because of the point contact between ball and the work piece. Thus, in order to eliminate the flaws, an attempt has been made. To remove the limitations of previous works, multi roll burnishing tool has been developed to finish the inside of the Gunmetal cylindrical bush. Taguchi method is used to study the effect and contribution of the burnishing parameters such as speed (rpm), feed and number of passes. Trends of surface roughness revealed that maximum surface finish is obtained at low speed and intermediate level of passes. The feed comes out to be an insignificant parameter. Trends of surface hardness revealed that maximum hardness is obtained at maximum speed and maximum number of passes. The feed rate comes out to be insignificant in this case also. The contribution of parameters is found to be accurate at 95% confidence level. The optimization is carried out through confirmatory experiments.