Dimensional Errors of Fixtures, Locating and Measurement Datum Features in the Stream of Variation Modeling in Machining

[+] Author and Article Information
Dragan Djurdjanovic, Jun Ni

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109-2125

J. Manuf. Sci. Eng 125(4), 716-730 (Nov 11, 2003) (15 pages) doi:10.1115/1.1621424 History: Received December 01, 2001; Revised June 01, 2003; Online November 11, 2003
Copyright © 2003 by ASME
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Flow-chart of the linear state space modeling of dimensional machining errors
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Two-dimensional rectangular part shown in plot (a) is located into the machining station using a fixture used shown in plot (b). Locating is accomplished using features 1 and 2 as locating datum features, as indicated in plot (c).
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Translation OMFOMF⃗ and rotation ΔεzMF(k) of the coordinate system MF induced by errors Δf⃗(k) in the fixture parameters
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Translation OLOMF⃗ and rotation ΔεzP(k) of the workpiece and the attached part coordinate system P induced by the errors in the position and orientation of the locating datum features 1 and 2
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Errors in the measurement datum features 3 and 4 induce a rotation Δε̄zP0(k) and translation OPOP⃗ of the coordinate system P defined by the actual measurement features with respect to the coordinate system P defined by the nominal measurement datum features
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Cylinder head used to validate the modeling procedures presented in this paper




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