Selective assembly is a method to achieve high precision fit using low precision parts. The current practices in selective assembly lack a physical process model to guide the design and process of mating parts, consequently, selective assembly is often a nightmare for manufacturing people and historically an event to be avoided. Process capability indices (PCIs) are the widely accepted process parameters, functioning as a measure of process performance, such as process centering, process spread, process bias, etc. In this paper, the concept of PCI-based tolerance is proposed as an interface between quality requirements and statistical process control (SPC) parameters. An analytical model involving PCI-based tolerance is developed to predict and assure the matchable degree in selective assembly. A detailed case study of the fit of dry liners and cylinder blocks in a diesel engine is presented. As matchable degree and other process quality requirements can be assured at the stage of design by introducing PCI-based tolerance, the process of selective assembly can be improved significantly as an effective way to achieve precision assembly with economical manufacturing processes.
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August 1999
Research Papers
Predict and Assure the Matchable Degree in Selective Assembly via PCI-based Tolerance
Yu Zhang,
Yu Zhang
Department of Mechanical Engineering, Iowa State University, Ames, IA, 50011
Search for other works by this author on:
X. Daniel Fang
X. Daniel Fang
Department of Mechanical Engineering, Iowa State University, Ames, IA, 50011
Search for other works by this author on:
Yu Zhang
Department of Mechanical Engineering, Iowa State University, Ames, IA, 50011
X. Daniel Fang
Department of Mechanical Engineering, Iowa State University, Ames, IA, 50011
J. Manuf. Sci. Eng. Aug 1999, 121(3): 494-500 (7 pages)
Published Online: August 1, 1999
Article history
Received:
December 1, 1997
Revised:
June 1, 1998
Online:
January 17, 2008
Citation
Zhang, Y., and Fang, X. D. (August 1, 1999). "Predict and Assure the Matchable Degree in Selective Assembly via PCI-based Tolerance." ASME. J. Manuf. Sci. Eng. August 1999; 121(3): 494–500. https://doi.org/10.1115/1.2832708
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