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Research Papers

A Machining-Dimension-Based Approach to Locating Scheme Design

[+] Author and Article Information
Guo-Hua Qin

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, Xi’An, Shaanxi 710072, P.R. China; School of Aeronautical and Mechanical Engineering, Nanchang Hangkong University, P.O. Box 3, Nanchang, Jiangxi 330063, P.R. China

Wei-Hong Zhang1

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, Xi’An, Shaanxi 710072, P.R. China

Min Wan

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, Xi’An, Shaanxi 710072, P.R. China

1

Corresponding author.

J. Manuf. Sci. Eng 130(5), 051010 (Aug 19, 2008) (8 pages) doi:10.1115/1.2953073 History: Received August 30, 2007; Revised May 15, 2008; Published August 19, 2008

In traditional and modern manufacturing systems, how to plan the workpiece holding is the first issue of the machining operation to be confronted for the fixture design. To ensure the machining accuracy of specific dimensions, it is necessary to develop a proper fixture locating scheme to constrain correctly the degrees of freedom (DOFs) of a workpiece with respect to the cutting tool. In this paper, a machining-dimension-based locating scheme design approach is developed and partitioned into two main parts for the study. First, the relationship is established between the machining dimensions and the DOFs to be constrained theoretically. Second, the fixture locating scheme is established to characterize the practical constrained DOFs of a workpiece in terms of the known locator number and positions. As a result, judgment criteria are formulated quantitatively for the first time to verify not only the locating scheme correctness but also to identify the cause of locating scheme incorrectness. Finally, two test examples are illustrated to show the proposed locating scheme.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flowchart of machining-dimension-based locating scheme

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Figure 2

The motion status of the workpiece

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Figure 11

Locators 4 and 5 aligned along the Z direction

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Figure 3

The relationship diagram between the machining dimensions and the theoretical constrained DOFs

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Figure 4

Effect of the locator number and positions. (a) Locating Scheme 1: deterministic location; (b) Locating Scheme 2: complete over location; (c) Locating Scheme 3: partial location; (d) Locating Scheme 4: partial over location; (e) Locating Scheme 5: under location; (f) Locating Scheme 6: under over location.

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Figure 5

Illustration of the locating scheme to the workpiece

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Figure 6

Flowchart of verifying different locating schemes

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Figure 7

Analysis and design procedure of the locating scheme

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Figure 9

3-2-1 locating scheme: (a) before redesigned; (b) after redesigned

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Figure 10

Locators 4 and 5 aligned along the X direction. (a) Possible Position 1; (b) Possible Position 2.

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