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Observing Dimensional Variation in an Automotive Sheet-Metal Sub-Assembly
Technical Paper
2006-01-1635
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a measurement case study of an automotive stamped sheet metal sub-assembly, in order to build a better understanding of flexible component tolerance stack-up in a physical production line assembly. Here, corresponding points are measured before and after assembly to capture changes in variation. Variation levels, variation stack-up, and positional shifts were investigated. It was found that that in terms of a Process Potential Index (Pp), the assembly was dimensionally better than its components. In some regions variation levels were found to be higher after assembly compared to before: in other regions, variation levels were found to be lower after assembly than before. Observation of positional shifts of features over the assembly process revealed consistent directional changes. Suspected causes are datum-shifts between assembly stations and measurement gauges, and assembly processes deforming/shifting the components in a consistent manner. The findings of this study begin to identify characteristics of variation and tolerance stack-up in flexible sheet-metal assemblies.
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Citation
Matuszyk, T., Cardew-Hall, M., and Rolfe, B., "Observing Dimensional Variation in an Automotive Sheet-Metal Sub-Assembly," SAE Technical Paper 2006-01-1635, 2006, https://doi.org/10.4271/2006-01-1635.Also In
References
- Camelio, J. Hu, J. Ceglarek, D. 2003 “Modeling variation propagation of multi-station assembly systems with compliant parts” Journal of Mechanical Design 125 673 681
- Guzman, G. L. M. Hammet, P. C. Herrin, G. D. 2004 “Understanding multivariate components – sheet metal assembly relationships using dimensional slow build studies” International journal of production research 42 No. 13 2651 2666
- Glancy, C. G. Chase, K. W. 1999 “A second order method for assembly tolerance analysis” Proceedings of the 1999 ASME Design Engineering Technical Conferences September 12–15 Las Vegas, Nevada 1 8
- Hu, M. Lin, Z. Lai, X. Ni, J. 2001 “Simulation and analysis of assembly processes considering compliant, non-ideal parts and tooling variations” International Journal of Machine Tools & Manufacture 41 2233 2243
- Lian, J. Lai, X. M. Lin, Z. Q. Yao, F. S. 2002 “Application of data mining and process knowledge discovery in sheet metal assembly variation diagnosis” Journal of Materials Process Technology 129 315 320
- Liu, C. Hu, J. 1995 “An offset finite element model and its applications in predicting sheet metal assembly variation” International Journal of Machining, Tools and Manufacturing 35 No. 11 1545 1557
- Liu, C. Hu, J. 1997 “A parametric study of joint performance in sheet metal assembly” International Journal of Machining, Tools and Manufacturing 37 No. 6 873 884
- Manarvi, I. A. Juster, N. P. 2004 “Framework of an integrated tolerance synthesis model and using FE simulation as a virtual tool for tolerance allocation in assembly design” Journal of Materials Processing Technology 150 182 193
- Pingli, Y. Lang, F. Hsieh, C. 2005 “Clamp shimming optimisation for minimizing assembly deformation” Proceedings of the 2005 SAE World Congress, 2005-01-0824 1 6
- Placek, C. 1989 “Motorola, Westinghouse Nuclear Fuel Unit, Globe Metallurgical Named Malcolm Bridge National Quality Award Winners” Quality 13 14
- Takezawa, N. 1980 “An improved method for establishing the process-wise quality standard”, Reports of Statistical Application Research” JUSE 27 63 75