Spraying trajectory optimization is important for ensuring high quality coatings because the trajectory directly affects the coating formation. This paper describes a trajectory optimization method for planar spraying. Efficient, high quality planar spraying is realized by solving a complementary spraying gun model. As for NURBS free-form surfaces, artists use different size brushes to create finer features on some objects than on others. This concept of variable size brushes is implemented here by changing the distance from the spray gun to the surface for free-form surfaces. The spraying is further optimized on complex surfaces by varying the spraying speed. Simulations and tests show that the film thickness uniformity is 1.64% worse and the paint utilization rate is 13.54% higher when spraying flat surfaces but that the film thickness uniformity is improved from 31.68% to 4.79% when spraying free-form surfaces. The results verify the effectiveness of this method for free-form surfaces.
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2020, Vol. 60 
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