DefinePK

Abstract

Shot blasting is a method used to clean, strengthen or polish metal. Shot blasting emerged as one of the most effective technique for surface preparation prior to operations such as galvanizing, electroplating, welding, enameling, glass coating and rubberizing. As it is very important in the common industrial usage, there emerges a need to study about the functional and operating parameters relating to shot blasting method, which in turns improves overall production rates, improved finishing and economical viability. This research work is focused on studying the surface finish rate by providing damping on the work piece during the shot blasting process and compares it with a conventional shot blasting process without providing cushioning action for the work piece. Also investigations have been carried out to evaluate parameters which are affecting the coating removal rate during shot blasting process. An experimental set up for the same has been designed and fabricated. Garnet of mesh size 30-60 mesh has been used as blasting abrasive. Springs having stiffness of 120 Kgf/mm and 60 Kgf/mm have been used to provide cushioning effect for the aluminium, GI and mild steel specimens were used for experiments. Compressor with pressure of 10 bar has been used as air supply. Experiments were conducted to evaluate the effect of cushioning of work piece on surface roughness and coating removal time (CRT) .Experiments revealed that the cushioning effect provided for work pieces improves the surface finish, coating removal rate and reduces the coating removal time. This approach also helps the shot blasting method to become economically viable.