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Research Papers

Controlling Geometrical Variation Caused by Assembly Fixtures

[+] Author and Article Information
Kristina Wärmefjord

Mem. ASME
Department of Product and
Production Development,
Chalmers University of Technology,
Göteborg SE-412 96, Sweden
e-mail: kristina.warmefjord@chalmers.se

Johan S. Carlson

Fraunhofer-Chalmers Research Centre,
Chalmers Science Park,
Göteborg SE-412 88, Sweden
e-mail: johan.carlson@fcc.chalmers.se

Rikard Söderberg

Mem. ASME
Department of Product and
Production Development,
Chalmers University of Technology,
Göteborg SE-412 96, Sweden
e-mail: rikard.soderberg@chalmers.se

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received July 1, 2015; final manuscript received January 26, 2016; published online February 17, 2016. Assoc. Editor: Vijay Srinivasan.

J. Comput. Inf. Sci. Eng 16(1), 011007 (Feb 17, 2016) (8 pages) Paper No: JCISE-15-1214; doi: 10.1115/1.4032625 History: Received July 01, 2015; Revised January 26, 2016

In the auto body assembly process, fixtures position parts during assembly and inspection. Variation in the positioning process propagates to the final assembly. To control the assembly fixtures, repeatability studies are used. Those studies are, however, usually done with long intervals and the fixtures might be afflicted with variation between studies. There are also other sources of variation in the final assembly, such as variation in parts due to previous manufacturing steps. To separate variation caused by fixtures and the variation caused by previous manufacturing processes, a multivariate fixture failure subspace control chart is proposed.

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References

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Figures

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Fig. 1

The product realization loop

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Fig. 2

A 3-2-1 locating scheme

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Fig. 3

Top: The side panel assembly consists of the door panel and the outer side panel. Middle: The assembly is positioned in xz-direction using the locators labeled B1 and B2. Bottom: The assembly is measured in four inspection points.

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Fig. 4

Top: The original data from inspection point 2 in x-direction, side panel assembly. Bottom: The same data but with the trends eliminated.

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Fig. 5

Tfixture2 - and SPEfixture -chart to control the variation in the fixture failure subspace, side panel assembly

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Fig. 6

The bumper and floor are assembled. Finally, 14 points on the bumper are measured.

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Fig. 7

Inspection data for 36 assemblies in 14 inspection points

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Fig. 8

Tfixture2- and SPEfixture -chart to control the variation in the fixture failure subspace, bumper assembly

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