A Systematic Approach for Analyzing the Fixturability of Parts for Machining

[+] Author and Article Information
S. K. Ong, A. Y. C. Nee

Department of Mechanical and Production Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260

J. Manuf. Sci. Eng 120(2), 401-408 (May 01, 1998) (8 pages) doi:10.1115/1.2830140 History: Received December 01, 1994; Revised January 01, 1997; Online January 17, 2008


Design for manufacturability (DFM) is a growing concern in the academia as well as the industry. However, an evaluation of the manufacturability of the features on a part is incomplete without considering the work-holding requirements of and the pre-processes that have been performed on the part (i.e., the initial state of the part before machining could be a casting or a prismatic block). A feature on a part, which has been evaluated to be manufacturable in its own right, might not be achievable when it is being machined together with other features in a set-up, if the part cannot be properly fixtured during the machining of this set-up. In this paper, the authors proposed a fuzzy set based fixturability evaluation procedure for establishing fixturing relations between the features on a part and assessing the suitability of these features for use as fixturing features during the machining of other features on the part. The overall fixturability of a part as a whole is evaluated after a set-up plan has been formulated for producing it and a fixture configuration and a fixturability index have been found for each of the set-ups in this set-up plan. Although the methodology has been formulated for machining features of prismatic parts, the approach is also applicable to castings and non-prismatic parts. The fuzzy membership functions for assessing the fixturing properties of features are generic to features that are found on castings and prismatic parts.

Copyright © 1998 by The American Society of Mechanical Engineers
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