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Automotive lamp shell injection molded parts
Use the coordinate measuring machine to study the CMM/CAD technology of the injection molded parts of the automobile lamp housing, and design a set of methods to improve the inspection accuracy, inspection speed and fast reverse modeling. The specific research work is as follows:1. Plan the CMM measurement path of the lamp housing. Introducing the theory of multi-color set, the lamp shell is divided into 54 features according to plane, circle, cylinder, and plane. The probe type, measurement direction, and safety plane are used as the personal color of the lamp shell feature, and the logical addition of the personal color is performed. Establish a unified color model for the feature set to be tested. The minimum spanning tree kruskal algorithm is used to calculate the shortest measurement path for the surface characteristics of the injection molded parts of the automobile lamp housing. In the process of measurement path planning, the safety plane, moving points and probe retreat distance are designed to achieve the purpose of measurement path collision and avoidance.
4. Using the first CAD reverse modeling digital model, carry out the second sampling of automobile lamp shell injection parts, establish the best-fitting coordinate system, and optimize the sampling strategy. Using the second CMM sampling data, the method to improve the modeling accuracy is studied, and the reverse modeling of the lamp housing is optimized. Use the shortest measurement path planned by the coordinate measuring machine to verify and evaluate the modeling results after CAD optimization.