Title: A novel approach to fixture design based on locating correctness

Authors: G.H. Qin, W.H. Zhang, M. Wan, S.P. Sun

Addresses: School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, P.O. Box 3, 330063 Nanchang, Jiangxi, China. ' Sino-French Laboratory of Concurrent Engineering, The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University, P.O. Box 552, 710072 Xi'an, Shaanxi, China. ' Sino-French Laboratory of Concurrent Engineering, The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University, P.O. Box 552, 710072 Xi'an, Shaanxi, China. ' School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, P.O. Box 3, 330063 Nanchang, Jiangxi, China

Abstract: In a machining process, since the geometric accuracy of a manufacturing workpiece mainly relies on the relative position of workpiece to the machining tool, fixtures are needed to locate the workpiece. The clear concept of locating correctness is presented based on Venn diagram and a general algorithm is proposed to determine the locator number and layout. On one hand, the theoretical and practical constrained DOFs are formulated as a function of the machining requirement and the locating scheme, respectively. On the other hand, some criteria are concluded to analyse the locating correctness and modify the locating scheme with locating incorrectness.

Keywords: CAFD; computer-aided fixture design; locating correctness; degrees of freedom; machining requirements.

DOI: 10.1504/IJMR.2010.035812

International Journal of Manufacturing Research, 2010 Vol.5 No.4, pp.429 - 448

Available online: 05 Oct 2010 *

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