six-sigmatrainingbook-全文預(yù)覽
【正文】 FAITH I BY FAITH。 Cpk 36BPTL Confidential 6σ推行教材工序潛力 Cp 指標(biāo)顯示實(shí)際工差 (6?)是否超出規(guī)格 .公式37BPTL Confidential 6σ推行教材工序潛力傳統(tǒng)上 , Cp 有 時(shí)顯示工序能力被判為 “有能力考核成績(jī) ”.– 若數(shù)據(jù)集中于工程工差內(nèi) , 將僅有 % 的工件會(huì)超差 . Cp 拒貨率 % % ppm ppb38BPTL Confidential 6σ推行教材工序潛力a) b)c) a) 工序能力高 (Cp2)b) 工序能力可 (Cp=1 to 2)c) 工序能力差 (Cp1)39BPTL Confidential 6σ推行教材工序潛力The Cp index pares the allowable spread (USLLSL) against the process spread (6?). It fails to take into account if the process is centered between the specification limits.Process is centered Process is not centered40BPTL Confidential 6σ推行教材工序表現(xiàn)The Cpk index relates the scaled distance between the process mean and the nearest specification limit.41BPTL Confidential 6σ推行教材工序表現(xiàn) Cpk 不良率 – % – % – % – ppm – ppm – ppm 794 – 1589 ppb 170 – 340 ppb 33 – 67 ppb 6 – 12 ppb 1 – 2 ppb 42BPTL Confidential 6σ推行教材工序表現(xiàn)a)工序能力高 (Cpk)b)工序能力可 (Cpk=1 to )c)工序能力差 (Cpk1)a)Cp = 2Cpk = 2b)Cp = 2Cpk = 1c)Cp = 2Cpk 143BPTL Confidential 6σ推行教材工序潛力與工序表現(xiàn)(a) Poor Process Potential (b) Poor Process PerformanceLSL USLLSL USLExperimental Design? to reduce variationExperimental Design? to center mean? to reduce variation44BPTL Confidential 6σ推行教材工序潛力與工序表現(xiàn)a)Cp = 2Cpk = 2b)Cp = 2Cpk = 1c)Cp = 2Cpk 145BPTL Confidential 6σ推行教材工序穩(wěn)定性A process is stable if the distribution of measurements made on the given feature is consistent over time.TimeStable ProcessTimeUnstable Processucllclucllcl46BPTL Confidential 6σ推行教材短期工序能力與長(zhǎng)期工序能力短期工序能力 (previously called shortterm capability) shows the inherent variability of a machine/process operating within a brief period of time.長(zhǎng)期工序能力 (previously called longterm capability) shows the variability of a machine/process operating over a period of time. It includes sources of variation in addition to the shortterm variability.47BPTL Confidential 6σ推行教材Within OverallSample Size 30 – 50 units ? 100 unitsNumber of Lots single lot several lotsPeriod of Time hours or days weeks or monthsNumber of Operators single operator different operatorsProcess Potential Cp Pp Process Performance Cpk Ppk短期工序能力與長(zhǎng)期工序能力48BPTL Confidential 6σ推行教材實(shí)戰(zhàn)演練The length of a camshaft for an automobile engine is specified at 600 177。 比較 “工序的現(xiàn)狀 ” 與 “客戶的要求 ”, 均須以規(guī)格為依據(jù)216。 鑒于 “用事實(shí)說(shuō)話 ”,即 一個(gè)人僅需要用源于工序的數(shù)據(jù) 來(lái)判定工序是處于受控狀態(tài) .216。m = s = 正態(tài)分布的一些特性12BPTL Confidential 6σ推行教材MiniTab:Calc 240。m = s = + 165。Point of Inflection1?+ 165。)What is the difference between process A B for each case?正態(tài)分布的一些特性9BPTL Confidential 6σ推行教材4 The mean, median and mode all coincide at the same value ?. There is perfect symmetry.181。
語(yǔ)文相關(guān)推薦
鄂ICP備17016276號(hào)-1