A Review - Experimental investigation on ball burnishing of surfaces produced by thermal spray

Mechanical Engineering

Flame sprayed thermal coating is approach to improve wear as well as overall life of workpiece. but this type of coating have inherent irregularities and defects like micro cracks that cause energy dissipation and surface damage. To Overcome These Complications, Conventional Finishing Processed Such As Grinding have been traditionally employed. However, since this methods essentially depend on chip removal to attain the desired surface finish, these machining chips may cause further surface abrasion and geometric tolerance problem especially if conducted by unskilled operators. Burnishing is a cold forming 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. This paper is deals with the thermal spray flame coating is used to increase wear as well as overall life of component and post machined by ball burnishing to achieve smaller surface roughness value and improving surface hardness.

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