Abstract:

In this paper, a large concrete casting was taken as the research object, and a STL model based cavity segmentation algorithm was proposed to solve the problem of low efficiency of artificial design of multiple parts. By changing the direction of the triangular patch of the STL model, this paper transformed the STL model of the large component into the STL model of the mold cavity. This algorithm classified the mold cavity STL model data, and uses the normal vector of the triangular face as the judging condition. Then this algorithm classified the face slices of the same type surface to a same STL model. Thus, the STL model of a mold cavity was divided into several surface STL models, and the mold cavity was segmented. Finally, it was proved that the algorithm shortens the design time and improves the efficiency, and proved that the algorithm is feasible, by comparing the design time of two typical algorithms and the time of artificial design.

Key words: prefabricated construction, cavity, stereo lithography file, topological relation, mould, cavity segmentation algorithm