| Summary: | 碩士 === 國立清華大學 === 工業工程研究所 === 82 === In sheet metal product and process design, there is a strong
demand to find a methodology that can produce sheet metal
product design efficiently and effectively. An "efficient"
design process means creating a design in the timely matter.
On the other hand, an "effective" design process creates a
valid design that can easily be manufactured. In this thesis,
a process-driven feature-based methodology is developed to
fulfill the demands. We propose a feature representation
scheme for sheet metal parts. By using this feature
representation scheme, the designer can use the features to
describe or design the sheet metal part. The features can be
classified into two primary types. One is called master
feature, which is used to represent the primary profile of the
sheet metal part. The other type is called manufacturing
feature entity, which represents a single sheet metal
manufacturing process. Some primitive features are defined to
represent the manufacturing feature entities. Compound
features can be defined by users to fulfill some specific
design intention. In order to present a sheet metal part
design that is readily for sheet metal processes, the
subsequent assembly and inspection, the tolerance information
is vital. Thus, the geometric and dimensional tolerance
information is allowed to add into feature definition in this
thesis. The data structure for the feature-based design is
developed considering not only topology and geometry but also
tolerance data. A prototype system, called SMCAD, has been
implemented in a solid modeler, called ACIS, based on the
feature representation scheme and data structure proposed in
this thesis.
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