CAFixD: A Case-Based Reasoning Fixture Design Method. Framework and Indexing Mechanisms

[+] Author and Article Information
Iain M. Boyle

Computer Aided Manufacturing Laboratory, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609-2280

Kevin Rong

Computer Aided Manufacturing Laboratory, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609-2280rong@wpi.edu

David C. Brown

Department of Computer Science, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609-2280

J. Comput. Inf. Sci. Eng 6(1), 40-48 (Mar 18, 2005) (9 pages) doi:10.1115/1.2161229 History: Received July 13, 2004; Revised March 18, 2005

Fixtures accurately locate and secure a part during machining operations. Various computer-aided fixture design (CAFD) methods have been developed to reduce design costs associated with fixturing. One approach uses a case-based reasoning (CBR) method where relevant design experience is retrieved from a design library and adapted to provide a new design solution. Indexing design cases is a critical issue in CBR, and CBR systems can suffer from an inability to distinguish between cases if indexing is inadequate. This paper presents CAFixD, a CAFD methodology that adopts a rigorous approach to defining indexing attributes based upon axiomatic design functional requirement decomposition. 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 reconstituted to form a complete fixture design. This paper presents the CAFixD framework and operation, and discusses in detail the indexing mechanisms used.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

A typical modular fixture

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Figure 2

The CAFixD methodology

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Figure 4

Axiomatic domains applied to fixturing

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Figure 5

The design case base

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Figure 6

Case library 1—Conceptual design solutions

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Figure 7

Decomposition of 3-2-1 locating solutions

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Figure 8

A partial FR decomposition

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Figure 9

The decomposition of case library 2

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Figure 10

The two types of horizontal locators

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Figure 11

The fixture for a caliper

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Figure 12

Caliper locating points

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Figure 13

The decomposition of case library 1

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Figure 14

A primary clamping unit

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Figure 15

The second layer of the design matrix

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Figure 19

The new design solution

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Figure 18

The two complete fixture designs

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Figure 17

The FR set for the new design



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