Fixtures accurately locate and secure a part during machining operations such that the part can be manufactured to design specifications. To reduce design costs associated with fixturing, various computer-aided fixture design (CAFD) methods have been developed through the years to assist the fixture designer. One approach is to use a case-based reasoning (CBR) method where relevant design experience is retrieved from a design library, and adapted to provide a new fixture design solution. Indexing design cases is a critical issue in any CBR approach, and CBR systems can suffer from an inability to distinguish between cases if indexing is inadequate. This paper presents a CAFD methodology, entitled CAFixD, that adopts a rigorous approach to defining indexing attributes in which axiomatic design functional requirement decomposition is adopted. Thus, a design requirement is decomposed in terms of functional requirements, physical solutions are retrieved and adapted for each individual requirement, and the design is then re-constituted to form a complete fixture design. Furthermore, adaptability is used as the basis by which designs are retrieved in place of the normal attribute similarity approach, which can sometimes return a case that is difficult or impossible to fix. This paper presents the CAFixD framework and operation, and discusses in detail the indexing mechanisms used.
- Design Engineering Division and Computers and Information in Engineering Division
CAFixD: A Case-Based Reasoning Fixture Design Method — Framework and Indexing Mechanisms
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Boyle, IM, Rong, K, & Brown, DC. "CAFixD: A Case-Based Reasoning Fixture Design Method — Framework and Indexing Mechanisms." Proceedings of the ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Volume 4: 24th Computers and Information in Engineering Conference. Salt Lake City, Utah, USA. September 28–October 2, 2004. pp. 367-375. ASME. https://doi.org/10.1115/DETC2004-57689
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