| dc.description.abstract | The geometric model of a shoe last is a typically composed of free form surfaces rather than basic geometric shapes. In the early, if the mother-last was completed and was used to produce large number of shoe lasts, the only method that could be used was mechanical mockup. After the CAD/CAM system is widely used, the Reverse Engineering Technology can be applied to reconstruction the CAD model of the parts and hence to the purpose of design, manufacturing or analysis. However, the efficiency of establishing CAD model for shoe last is not good enough.
Due to the fact that most reverse engineering software used for CAD model reconstruction belong to general-purpose type, this research is intended to develop domain-based reverse engineering technology for shoe last. The proposed strategy include (1) straight and rotate slicing of STL format parts, sorting, sampling, edge detection and segmentation, (2) specific curve and surface reconstruction algorithm that is more convenience in the user interface, (3) surface merge algorithm enhancing automatic detection of the common surface edges. A series of processes for the CAD model reconstruction of shoe last are proposed. The propose results are compared with those obtained by means of commercial software – Surfacer in terms of reconstruction procedure, reconstruction efficiency, quality of surface and function completeness of the CAD model of the shoe last. | en_US |