spc基本概念介紹(編輯修改稿)
2025-03-09 01:21 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 ble Data) 種類 適用狀況平均值與全距管制圖? 可用以管制分組之計(jì)量數(shù)據(jù)，即每次同時(shí)取得幾組數(shù)據(jù)之工程，如長(zhǎng)度、濃度、成份等? 是掌握工程狀態(tài)最有效之管制圖 平均值與標(biāo)準(zhǔn)差管制圖? 與 相同，用於 subgroupsize≧ 10時(shí) 中位數(shù)與全距管制圖? 與 相同，但檢出力較差 個(gè)別值與移動(dòng)全距管制圖? 適用於找出不同 subgroup間之變化時(shí) Sinderella Liu種類 適用狀況PChart 不良率管制圖 ? 其數(shù)據(jù)有兩種類別，如合格 /不合格、通過(guò) /不通過(guò)等 NPChart 不良數(shù)管制圖? 與 PChart相同，每組樣本需相同 CChart缺點(diǎn)數(shù)管制圖? 每單位數(shù)內(nèi)缺點(diǎn)發(fā)生之次數(shù) UChart單位缺點(diǎn)數(shù)管制圖? 與 CChart相同，但樣本大小不同 ☆ 計(jì)數(shù) 值 (Attribute Data / Countable Data) ☆ 管制圖之選擇方式 ： 請(qǐng)參閱 QS9000 SPC Manual, Appendix C Sinderella LiuDataCollection?Rationalsamples(unbiasedandrandom)?Groupsmeasurement?Variationisattributableonlytoaconstantsystemofmoncause.?MinimizetheoccurrenceofspecialcauseswithinsampleCalculationNecessaryItems?Controllimit(20~25subgroupsofdataarerequired)?CentrallineEstablishControlChart?Processmonitor?Alarmsystem?DetectspecialcauseSinderella LiuTherearetwo process characteristicsthataregeneralinterestinthestatisticalprocesscontrol:?The mean level of the process?The amount of variation in the processAverageChartRangeChartTointerpretthepatternsinthecontrolchartAlways Begin with R ChartXRChartSinderella LiuSampleSize:nTotal:kSubgroupsSinderella LiuXChart:Step1:CalculateMeanandRangeofeachSubgroupWhere:MeanistheaveragevalueofeachsubgroupRangeisthedifferencebetweenMaxandMinvalueineachsubgroupMeanRangeSinderella LiuXChart:Step2: CalculateCenterline、 Upper and Lower control limitasfollows:Centerline:Where: kisthenumberofsubgroupsisthemeanvalueofi’thsubgroupisthearithmeticaverageofallavailablesampleaverageSinderella LiuXChart:Upper and Lower control limitUpper Control Limit:Lower Control Limit:Where: RistheaverageofthesamplerangesAisaconstantwhichvaryingsamplesizenandtabulated2Sinderella LiuR Chart : Where: kisthenumberofsubgroupsistheRangeofi’thsubgroupisthearithmeticaverageofallavailablesamplerangeCalculateCenterline、 Upper and Lower control limitasfollows:Centerline:Sinderella LiuR Chart : Upper and Lower control limitUpper Control Limit:Lower Control Limit:Where: RistheaverageofthesamplerangesDandDisaconstantwhichvaryingsamplesizenandtabulated3 4Sinderella Liu 2 3 4 5 6
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