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TECHNICAL PAPERS

Effect of Mechanical Alignment System on Assembly Accuracy

[+] Author and Article Information
Neville K. S. Lee, Grace H. Yu, J. Y. Chen, Ajay Joneja

Dept. of IEEM, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

J. Manuf. Sci. Eng 125(3), 595-608 (Jul 23, 2003) (14 pages) doi:10.1115/1.1580848 History: Received April 01, 2003; Online July 23, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic figure on how to reason the workpiece direction
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Same orientation tolerance different location tolerance (a)&(b): Datum location tolerance=0.002 mm, orientation tolerance=0.02 grad; (c)&(d): Datum location tolerance=0.02 mm, orientation tolerance=0.02 grad; (e)&(f ): Datum location tolerance=0.2 mm, orientation tolerance=0.02 grad.
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Schematic of MAS with truncated datum
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Schematic of error translation
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Multiple alignment positions due to workpiece imperfection
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Schematic of planar datum MAS with workpiece imperfection
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Effect of datum radius on multiple station process with reference surface roughness=5 μm
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Effect of datum radius on multiple station process with reference surface roughness=1 μm
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Effect of datum radius on multiple station process with reference surface roughness=0.1 μm
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Relationship between datum and workpiece
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Flow chart of simulation algorithm on alignment precision
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Generated datum surface RMS=0.04 μm
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Moving averaged theoretical surface waviness profile, RMS=4 μm
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Moving averaged theoretical surface roughness profile, RMS=1 μm
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Superimposition of positions of a workpiece at two workstations
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Multi-step processing of workpiece (a) Workstation 1; (b) Workstation 2
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Shifting of the reference surface due to the shifting of the workpiece
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Ideal and actual contact conditions between datum and reference surfaces
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Alignment variation due to angular error
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Alignment variation due to dimensional error
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Assembly imprecision due to dimensional errors (a) fabrication station; (b) Assembly station
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Same location tolerance different orientation tolerance (a)&(b): Datum location tolerance=0.02 mm, orientation tolerance=0.002 grad; (c)&(d): Datum location tolerance=0.02 mm, orientation tolerance=0.02 grad; (e)&(f ): Datum location tolerance=0.02 mm, orientation tolerance=0.2 grad.

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