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Research Papers

Straight-Build Assembly Optimization: A Method to Minimize Stage-by-Stage Eccentricity Error in the Assembly of Axisymmetric Rigid Components (Two-Dimensional Case Study)

[+] Author and Article Information
T. Hussain1

Z. Yang, A. A. Popov, S. McWilliam

Materials, Mechanics and Structures Research Division,  University of Nottingham, Nottingham, NG7 2RD, UK

1

Corresponding Author.

J. Manuf. Sci. Eng 133(3), 031014 (Jun 15, 2011) (9 pages) doi:10.1115/1.4004202 History: Received August 19, 2010; Revised April 28, 2011; Published June 15, 2011; Online June 15, 2011

For assembly of rotating machines, such as machining tools, industrial turbomachinery, or aircraft gas turbine engines, parts need to be assembled in order to avoid internal bending of the geometric axis of the rotor to meet functional and vibration requirements. Straight-build assembly optimization is a way of joining parts together in order to have a straight line between the centers of the components. Straight-build assembly is achieved by minimizing eccentricity error stage-by-stage in the assembly. To achieve minimal eccentricity, this paper proposes three assembly procedures: (i) table-axis-build assembly by minimizing the distances from the centers of components to table axis; (ii) minimization of the position error between actual and nominal centers of the component; and (iii) central-axis-build assembly by minimizing the distances from the centers of components to a central axis. To test the assembly procedures, two typical assembly examples are considered using four identical rectangular components and four nonidentical rectangular components, respectively. Monte Carlo simulations are used to analyze the tolerance build-up, based on normally distributed random variables. The results show that assembly variations can be reduced significantly by selecting best relative orientation between mating parts. The results also show that procedures (i) and (ii) have the most potential to minimize the error build-up in the straight build of an assembly. For these procedures, the variation is reduced by 45% and 40% for identical and nonidentical components, respectively, compared to direct-build assembly. Procedure (iii) provides better performance than direct-build assembly for identical components assembly, while it gives smaller variation at the first two stages and larger variation at the third stage for nonidentical components assembly. This procedure could be used in an assembly with limited stages.

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Copyright © 2011 by American Society of Mechanical Engineers
Topics: Manufacturing , Errors
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References

Figures

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Figure 2

Measurement of component variation

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Figure 3

An example of two component assembly

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Figure 4

Method 1 (a) assembly before optimization and (b) assembly after optimization

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Figure 5

Method 3 central-axis-build assembly

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Figure 6

Variation for the four identical components assembly ((a) variation from nominal axis and (b) variation from final central axis)

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Figure 7

Variation for the four nonidentical components assembly ((a) variation from nominal axis and (b) variation from final central axis)

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Figure 1

An example of geometric variation of 2D rectangular component

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