Effect of Burnishing Process on Behavior of Engineering Materials- A Review

Abstract

Quality of Surface is an important factor to decide the performance of a manufactured product. Surface quality affect product performance like assembly fit, aesthetic appeal that a customer might have for product. The nominal surfaces of the object are represented by perfect straight line, perfect circles, round holes, straightness and absolute perpendicularity A variety of processes are used to make the designed parts. The characteristics of surfaces includes surface texture, surface integrity which is always related with manufacturing processes for maintain quality of surfaces. For better quality surface finish the main factor is surface roughness. The lower value of roughness gives higher surface finish for the manufactured product. Now in present scenario different processes like grinding, honing, super finishing, polishing, burnishing etc are used to reduce the value of surface roughness. Burnishing is one of the processes which majorly affect the surface roughness. In conventional machining processes the tensile residual stresses are induced on the surface of material, which reduces the fatigue strength of material, this can be prevented by inducing residual compressive stresses on the surface of material. Burnishing is a cold working process in which initial asperities are compressed beyond yield strength against load. The surface of the material is progressively compressed, then plasticized as resultant stresses reach a steady maximum value and finally wiped a superfine finish. The highly finished processes find the application in aerospace and aircraft industry.