Coating uniformity with a uniform robotic spray gun velocity

Abstract

Coating uniformity model was developed to optimize spray painting robot trajectories, assuming uniform robot motion and a parabolic spray distribution with uniformity evaluated based on the thickness variation. Non-dimensional calculation shows that the overlap is a major factor influencing the mean coating thickness, with the seed path and work piece width as secondary factors. The minimum thickness variance was about 0.002 5 when the overlap was between 0.29 and 0.31. Thus, the overlap should be taken into account when planning spray painting robot trajectories, while the seed path position and work piece width can be neglected.