RPS Alignment of Automotive Body Parts in Virtual Assembly and Deviation Analyses

Quality of products depends on various factors. The most important factors are inspection and measurement. The products have to be controlled in all phases of manufacturing. The production of automotive parts, medical devices, sport equipments or any other body parts has to be controlled in all phases of production. The most important usage is in sheet metal work-piece inspection. One of the latest invented techniques is a scanning method with cross scanning laser devices. This paper describes an accurate and efficient algorithm of point cloud registration. The algorithm contains two steps: initial registration and precise registration. We use the best-fit method to do the initial registration. Then, in this coordinate system, we can extract six nominal points from CAD module, then using corresponding measured point extraction algorithm to get the six measured points. According to the 3-2-1 alignment principle, alignment can be performed and also we can do adjustment alignment. Using line profile to evaluate the part condition, the profile tolerance of any line and surface have datum claim, by comparing and analyzing their definition, indication, tolerance zone ,etc. and regard them as position tolerances. Keywords—automotive body, alignment, deviation, point clouds, RPS, virtual assembly, gap and flush ——————————  ——————————