Please use this identifier to cite or link to this item:
Title: Process monitoring strategies for surface mount manufacturing processes
Authors: Ho, S.-L.
Xie, M. 
Goh, T.-N. 
Keywords: Cumulative count conforming charts
Demerit control charts
Neural network modeling
Surface mount manufacturing
Issue Date: Apr-2003
Citation: Ho, S.-L., Xie, M., Goh, T.-N. (2003-04). Process monitoring strategies for surface mount manufacturing processes. International Journal of Flexible Manufacturing Systems 15 (2) : 95-112+187. ScholarBank@NUS Repository.
Abstract: Establishing reliable surface mount assemblies requires robust design and assembly practices, including stringent process control schemes for achieving high yield processes and high quality solder interconnects. Conventional Shewhart-based process control charts prevalent in today's complex surface mount manufacturing processes are found to be inadequate as a result of autocorrelation, high false alarm probability, and inability to detect process deterioration. Hence, new strategies are needed to circumvent the shortcomings of traditional process control techniques. In this article, the adequacy of Shewhart models in a surface mount manufacturing environment is examined and some alternative solutions and strategies for process monitoring are discussed. For modeling solder paste deposition process data, a time series analysis based on neural network models is highly desirable for both controllability and predictability. In particular, neural networks can be trained to model the autocorrelated time series, learn historical process behavior, and forecast future process performance with low prediction errors. This forecasting ability is especially useful for early detection of solder paste deterioration, so that timely remedial actions can be taken, minimizing the impact on subsequent yields of downstream processes. As for the automated component placement process where very low fraction nonconforming frequently occurs, control-charting schemes based on cumulative counts of conforming items produced prior to detection of non-conforming items is more sensitive in flagging process deterioration. For the reflow soldering and wave-soldering processes, the use of demerit control charts is appealing as it provides not only better control when various defects with a different degree of severity are encountered, but also leads to an improved ARL performance. Illustrative examples of actual process data are presented to demonstrate these approaches.
Source Title: International Journal of Flexible Manufacturing Systems
ISSN: 09206299
DOI: 10.1023/A:1024432723561
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Mar 18, 2019


checked on Mar 18, 2019

Page view(s)

checked on Jan 12, 2019

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.