A review of CADbased robot path planning for spray painting

Purpose Paint path planning for industrial robots is critical for uniform paint distribution, process cycle time and material waste, etc. However, paint path planning is still a costly and timeconsuming process. Currently paint path planning has always caused a bottleneck for manufacturing automation because typical manual teaching methods are tedious, errorprone and skilldependent. Hence, it is essential to develop automated tool pathplanning methods to replace manual paint path planning. The purpose of this paper is to review the existing automated tool pathplanning methods, and investigate their advantages and disadvantages. Designmethodologyapproach The approach takes the form of a review of automated tool pathplanning methods, to investigate the advantages and disadvantages of the current technologies. Findings Paint path planning is a very complicated task considering complex parts, paint process requirements and complicated spraying tools. There are some research and development efforts in this area. Based on the review of the methods used for paint path planning and simulation, the paper concludes that the tessellated CAD model formats have many advantages in paint path planning and paint deposition simulation. However, the tessellated CAD model formats lack edge and connection information. Hence, it may not be suitable for some applications requiring edge following, such as welding. For the spray gun model, more complicated models, such as 2D models, should be used for both path planning and paint distribution simulation. Paint path generation methods should be able to generate a paint path for complex automotive parts without assumptions, such as presupposing a part with a continuous surface. Practical implications The paper makes possible automated path generation for spraypainting process using industrial robots such that the pathplanning time can be reduced, the product quality improved, etc. Originalityvalue The paper provides a useful review of current paint pathplanning methodologies based on the CAD models of parts.