【文章內(nèi)容簡(jiǎn)介】 s, etc. 用途 : 察覺(jué)系統(tǒng)性的效性 . 如交替機(jī)臺(tái) ,人員 ,供應(yīng)商等 . Example: SPC Trend Rules(研判規(guī)則 ) Rule 5: 2 out of 3 consecutive points at least 2 std dev beyond the centerline, on the same side 規(guī)則 5: 連續(xù)同側(cè) 3點(diǎn)中 ,2點(diǎn)落在同側(cè) 2標(biāo)準(zhǔn)差之外 Uses: Detects large changes 用途 : 察覺(jué)大改變 False alarm rate: % 機(jī)率 : % Example: UCL CL LCL SPC Trend Rules(研判規(guī)則 ) Rule 6: 4 out of 5 consecutive points on the chart are more than 1 std dev away from the CL 規(guī)則 6: 連續(xù)同側(cè) 5點(diǎn)中 ,4點(diǎn)超出 1標(biāo)準(zhǔn)差 Uses: Detects moderatesized changes 用途 : 察覺(jué)中度改變 False alarm rate: % 機(jī)率 : % Example: SPC Trend Rules(研判規(guī)則 ) Rule 7: 15 (or more) consecutive points are within 1 std dev of the CL 規(guī)則 7: 連續(xù) 15點(diǎn)在 1標(biāo)準(zhǔn)差內(nèi) Uses: Detects a decrease in process variation 用途 : 察覺(jué)制程變異的降低 Example: SPC Trend Rules(研判規(guī)則 ) Rule 8: 8 (or more) consecutive points are on both sides of the CL, but none are within 1 std dev of it. 規(guī)則 8: 連續(xù)不同側(cè) 8點(diǎn) ,沒(méi)有一點(diǎn)在 1標(biāo)準(zhǔn)差內(nèi) . Uses: Detects an increase in process variation 用途 : 察覺(jué)制程變異的增加 Example: SPC Trend Rules(研判規(guī)則 ) ? Using a large of trend rules is unwise, since each trend rule has a false alarm rate the cumulative false alarm rate can be very large ? 使用大量的判斷規(guī)則是不智的 ,因?yàn)槊恳粭l都有誤判的機(jī)率 ,累積起來(lái)將可能很大 ? False alarm rate is the frequency of control chart signals when nothing at all is actually wrong with the process ? 誤判機(jī)率指的是制程一點(diǎn)問(wèn)題都沒(méi)有 ,但規(guī)則確告訴我們有問(wèn)題 . ? False alarms are undesirable: ? 誤判警告並不是我們想要的不必要的中斷生產(chǎn)造成產(chǎn)能降低 增加成本 ? 侵蝕對(duì)管制圖的信心 . 最後 , 忽視所有失控的信號(hào) , 導(dǎo)致品質(zhì) ,產(chǎn)量 成品損失 . SPC Trend Rules(研判規(guī)則 ) 選用規(guī)則建議方案 ? All control charts should at least use the 1st rule: – Point UCL or Point LCL ? 至少須使用第 1 條 ? For an automated SPC system with automated application of SPC trend rules, it’s highly remended to add 5th rule to detect large shifts in mean, (. 2 out of 3 rule) ? 若 spc系統(tǒng)是自動(dòng)的 ,非常建議增加第 5 條 ? Intel does remend as a goal to use rules 1, 2, 5, 6 when appropriate ? Intel建議使用 1, 2, 5, 6 條 SPC Trend Rules(研判規(guī)則 ) Rule 1: A single point beyond either control limit 規(guī)則 1: 單獨(dú)點(diǎn)超出管制界限 Uses: Detects very large/sudden shifts 用途 : 察覺(jué)重大 /突然的偏差 False alarm rate: % 機(jī)率 : % Example: UCL CL LCL Rule 2: 9 consecutive points on the same side of the centerline 規(guī)則 2: 連續(xù) 9點(diǎn)在中心線同側(cè) Uses: Detects small shifts or trends 用途 : 察覺(jué)微小 /趨勢(shì)性的偏差 False alarm rate: % 機(jī)率 :% Example: UCL CL LCL SPC Trend Rules(研判規(guī)則 ) Rule 5: 2 out of 3 consecutive points at least 2 std dev beyond the centerline, on the same side 規(guī)則 5: 連續(xù)同側(cè) 3點(diǎn)中 ,2點(diǎn)落在同側(cè) 2標(biāo)準(zhǔn)差之外 Uses: Detects large changes 用途 : 察覺(jué)大改變 False alarm rate: % 機(jī)率 : % Example: UCL CL LCL SPC Trend Rules(研判規(guī)則 ) Rule 6: 4 out of 5 consecutive points on the chart are more than 1 std dev away from the CL 規(guī)則 6: 連續(xù)同側(cè) 5點(diǎn)中 ,4點(diǎn)超出 1標(biāo)準(zhǔn)差 Uses: Detects moderatesized changes 用途 : 察覺(jué)中度改變 False alarm rate: % 機(jī)率 : % Example: SPC Trend Rules(研判規(guī)則 ) 不良率管制圖 (p Chart)公式： CLp = p = Σd / Σn p ( 1 p ) UCLp = p + 3 n p ( 1 p ) UCLp = p 3 n P Chart n:檢驗(yàn)數(shù) d:壞機(jī)數(shù) 2。 UT每?jī)尚r(shí)計(jì)錄一次生產(chǎn)數(shù)和壞機(jī)數(shù)在圖表上，再由組長(zhǎng)根據(jù) P chart上 13處的公式 算出不良率、不良率管制上限和不良率管制下限 ﹐ 在圖表上用小圓點(diǎn)表示出來(lái) ﹐ 并把小圓點(diǎn)依次連接起來(lái)。（圖表應(yīng)放置於看板上） 3。 組長(zhǎng)在圖表上描點(diǎn)后 ﹐ 根據(jù)上 P chart判定方法判定是否正常 ﹐ 如果發(fā)現(xiàn)有異常情況 出現(xiàn)及時(shí)反映給 PE、 QE， 再由 PE、 QE共同對(duì)異常情況作出判定後通知相關(guān)人員采取相應(yīng)的改善措施，並把情況與改善措施記錄與圖表異常說(shuō)明欄。 4。 根據(jù)本周的記錄數(shù)據(jù)算出本周平均不良率作為下周計(jì)算不良率管制界限的基準(zhǔn)。由產(chǎn) 線專人負(fù)責(zé)把本周各拉各工位