Quality improvement of SS 304 with variations in feed rate and spraying distance in semi-automatic sandblasting

Abstract

Roughness and flatness are things to consider in metal coating and painting. Sandblasting is one method to get certain roughness on the surface of the material. Blasting that occurs in the process affects roughness, flatness, and deflection of the workpiece. The purpose of this study was to determine the effect of the sandblasting process on surface roughness and flatness in SS 304 stainless steels material using variations in feed rate and distance by applying a semi-automatic sandblasting process by controlling the nozzle motion. The spray feed rate variations were 20, 40, and 60 mm min−1 and the distance variations were 100, 200, and 300 mm. The results of the test show that the smaller the feed rate and the closer the spraying distance, the higher the roughness value and the greater the deflection that affects surface flatness. The highest value occurs at a feed rate variation of 20 mm/min and a distance of 10 cm with a surface roughness value of 1.268 µm and flatness with a deflection angle formed of 1.184° one-sided treatment. In spraying experiments on two sided, improved the surface flatness with the highest deflection angle that occurs at a feed rate of 20 mm/min and a distance of 10 cm with a value of 0.737°.