Keywords
Citation
(2006), "Method for discriminating good or bad of product", Assembly Automation, Vol. 26 No. 1. https://doi.org/10.1108/aa.2006.03326aad.010
Publisher
:Emerald Group Publishing Limited
Copyright © 2006, Emerald Group Publishing Limited
Method for discriminating good or bad of product
Method for discriminating good or bad of product
Keywords: Assembly, Patents
Applicant: Sumitomo heavy industries
Patent number: JP2003181874
Publication date: 2 July 2003
Problem to be solved: To accurately discriminate good or bad of a product by dynamically changing an item used to discriminate at each manufacturing time by using an Maharanobis Taguchi system (MTS) method to deal with a change of a phenomenon. Solution: In the case of an injection molding machine, at step S5, distances of Maharanobis of n ways are calculated by using a plurality of items of result values of M of each shot are calculated according to a combination of an orthogonal table. At step S6, SN ratios of the n ways are calculated from the distances of the Maharanobis. At step S7, a level means (first level, second level of the table) of the items is calculated by using the calculated SN ratios, and m items are observed from larger one of the level mean difference (first level mean – second level mean). Again, m pieces of the distance of the Maharanobis are calculated by using these optimum m items, and if any one of the m pieces of the distances exceeds the reference value, it is decided to be a fault.