Computer-Aided Feature-Based Sheet Metal Design System

• Main Authors: Lai, Chi Shyan, 賴志弦
• Other Authors: Trappey, Amy J. C.
• Format: Others
• Language: en_US
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/80032295331922666296

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.