| Summary: | 碩士 === 國立中興大學 === 機械工程研究所 === 82 === In this research, the boundary representation of a solid model
is used to represent the shell of a sheet metal part.
Neglecting the thickness, mechanical behaviors, and material
properties of the sheet metal, the surface shell of the solid
model is automatically flattened into a planar model. The solid
model of a sheet metal product, based on the half- edge data
structure, is constructed by a series of low level
manipulations, i.e., Euler operations. Selecting the face
containing the most edges as the base face in the flattening
process, every adjacent face rotates with a rotating
transformation matrix around the connecting edge as the
rotating axis to the same plane with the base plane. And, the
planar model with all faces flattened in the same plane is
constructed. The data structure of the planar model is composed
of the vertices on the same plane, which are rotated from the
solid. Being a preliminary research of sheet metal flattening,
the proposed method is able to flatten the models with one step
of rotation, e.g., the pyramidal shapes of polyhedra.
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