spc統(tǒng)計(jì)過(guò)程控制簡(jiǎn)介(英文版)-展示頁(yè)
2025-02-26 05:51本頁(yè)面
【正文】 ity Index ? Example light bulbs are produced with an average life of 90 hours. The target design life is 100 hours. The UTL = 120 and the LTL = 80 hours. If ? = what is the Cpk? 4 Acceptance Sampling ? Purposes – Determine policy for accepting or rejecting a production lot of materials or ponents – Sample quality is used to make decision ? Advantages – Less handling damage – Fewer inspectors – Applicability to destructive testing – Entire lot rejection (motivation for improvement) 5 Acceptance Sampling ? Disadvantages – Risks of accepting “bad” lots and rejecting “good” lots – Added planning and documentation – Sample provides less information than 100percent inspection Acceptance Plans 1. SingleSample Plans only one sample define n and c – Operating Characteristic Curve graphs the performance of plan – Acceptable Quality Level defines good lots – Lot Tolerance Percent Defective defines bad lots – Average Outgoing Quality the percent defects in lots leaving inspection Acceptance Plans (cont) Producer’s Risk ( ) probability of rejecting good lot Consumer’s Risk ( ) probability of accepting a bad lot can reduce errors by not biasing the sample and tak
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