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Univariate Shewhart Charts and Process Capability
| Content Provider | Scilit |
|---|---|
| Author | Qiu, Peihua |
| Copyright Year | 2013 |
| Description | As described briefly in Section 1.3, statistical process control (SPC) of a produc- tion process can be roughly divided into two phases. In the initial stage (i.e., phase I), we usually do not know much about the performance of the production process yet, and our major goal in this stage is to properly adjust the production process to make it run stably. To this end, we usually let the production process produce a given amount of products, and the values of the quality characteristic(s) of interest of the manufactured products are then recorded and analyzed. From the statistical analysis of the collected data, if we find that the production process does not seem to run stably, then the root causes responsible for that unfavorable performance should be figured out and the corresponding adjustment of the production process should be made as well. After the adjustment, another set of data needs to be collected and analyzed, and the production process should be adjusted again if necessary. This analysis-and-adjustment process is then repeated several times until it is confirmed by the data analysis that the performance of the production process is stable. Once all special causes have been accounted for and the production process is in-control (IC), we collect an IC dataset from the products manufactured under the stable op- erating conditions, and this IC dataset is then used for estimating the IC distribution of the quality characteristic(s) of interest. Based on the (estimated) IC distribution, a phase II SPC control chart is designed, and it is used for online monitoring of the production process. When it detects a significant shift in the distribution of the qual- ity characteristic(s) from the IC distribution, a signal is delivered and the production process is stopped immediately for root cause identification and removal. This online monitoring stage of SPC is often called phase II SPC. Book Name: Introduction to Statistical Process Control |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2010-0-33543-1&isbn=9780429090776&doi=10.1201/b15016-8&format=pdf |
| Ending Page | 157 |
| Page Count | 46 |
| Starting Page | 112 |
| DOI | 10.1201/b15016-8 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2013-10-14 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Introduction To Statistical Process Control Manufacturing Engineering Quality Production Process Charts Ic Distribution |
| Content Type | Text |
| Resource Type | Chapter |
