sixsigmatrainingbook(1)(參考版)
2025-02-19 11:56本頁面
【正文】 Pass / Fail, very low counts Each must be approached differently.66BPTL Confidential 6σ推行教材謝謝觀看 /歡迎下載BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES. BY FAITH I BY FAITH。6? away from the process mean ?, . Cp ? 2,4 In the long run, the process will shift by less than ?, . Ppk ? ,4 The process will yield less than dppm rejected parts.6? 6?Shift??“Sigma Level” Capability62BPTL Confidential 6σ推行教材What’s Six Sigma Quality — NowMikel J Harry claims that the process mean between lots will vary, with an average process shift of ?.k? = z? + ? k? = z? + ? Shift?z?Note:Sigma Capability = ?(dpmo) ? ?(dppm)“Sigma Level” Capability63BPTL Confidential 6σ推行教材Types of Variation1. Positional VariationSame process, variation at differing locations simultaneously:Temperature variations inside a thermal chamberCavitytocavity variations in an injection mold2. Cyclical VariationSequential repetitions of a process over fairly short time, say, less than 15 mins:Variations between consecutive batches of a processDifferences from lot to lot of raw materials64BPTL Confidential 6σ推行教材Types of Variation3. Temporal VariationVariations over longer periods of time, such a several hours, days or weeks. 65BPTL Confidential 6σ推行教材Measurement System Analysis ApproachThere are two types of measurements possible:4 VariableData can be described on a continuous scale4 Attribute216。 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 ”.– 若數(shù)據(jù)集中于工程工差內(nèi) , 將僅有 % 的工件會超差 . 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 Con
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