【正文】 6.
Four times a day the supervisor would go to the press and gather up theparts produced by five consecutive cycles of the press. Since each cycleproduced four parts, he would have 20 parts to measure every two hours.The supervisor kept track of the cycle and the cavity from which each partcame and wrote his twentymeasurements in an array likethis: The supervisor collected samples four times a day for five days (20 samplestotal, 20 parts per sample). Calculate the process capability and use a MultiVarichart to help determine sources of variation.A BCDES1 18 19 20 19 21S2 13 16 14 13 13S3 10 11 13 10 13S4 11 12 13 13 13Exercise: Determine Capability Using Minitab, analyze the Thick datain for process capability
Remember, the specifications are: 11 177。也盡量打亂員工次序8，用 Minitab 作下列兩個(gè)分析StatQuality ToolsGage Ramp。工藝能力研究連續(xù)數(shù)據(jù) 離散數(shù)據(jù) ：短期還是長(zhǎng)期？： （通常是長(zhǎng)期）： ：Ⅰ ZU,ZL ：Ⅱ CP Ⅰ PPMⅢ CPK Ⅱ Sigma水平ZLTⅣ Sigma水平ZST Ⅲ PPK： ：Ⅰ Sigma水平ZLT Ⅰ Sigma水平ZSTⅡ PPK Ⅱ CPK確定工藝范圍:范圍至觀重要越窄越好！大量工藝步驟可能表明項(xiàng)目定義不佳或問(wèn)題源于幾個(gè)項(xiàng)目問(wèn)題藏于問(wèn)題中若問(wèn)題可以由粗略分析解決，管理層會(huì)去做繪制可執(zhí)行的工藝圖你能確認(rèn)缺陷來(lái)源嗎？我們能有意識(shí)地改變輸入指標(biāo)變量嗎？有意識(shí)的改變輸入指標(biāo)變量能直接影響輸出結(jié)果嗎？7，組成項(xiàng)目小組，列出小組成員。2，完成項(xiàng)目預(yù)測(cè)節(jié)省金額。c可交付使用的2對(duì)與生產(chǎn)來(lái)說(shuō)：a2 Pareto圖分析3，完成問(wèn)題陳述：8，完成財(cái)務(wù)評(píng)估。工藝流程圖（PFD）:6 Sigma 工藝流程圖的要素：所有工藝步驟包括隱形工廠數(shù)據(jù)采集點(diǎn)所有設(shè)備/工具各步驟表明增值性（VA）和非增值性（NVA）控制標(biāo)準(zhǔn)文件用標(biāo)準(zhǔn)符號(hào)繪制工藝流程：在Microsoft OfficeTM 等軟件中可找到 定性測(cè)量系統(tǒng)研究:定性型量具 Ramp。工藝能力計(jì)算實(shí)例一位技師負(fù)責(zé)醫(yī)院設(shè)備的蒸汽殺菌過(guò)程。R Study(Crossed)StatQuality ToolsGage Run Chart9，對(duì)測(cè)量系統(tǒng)能力研究結(jié)果進(jìn)行分析10，確定適當(dāng)?shù)暮罄m(xù)措施定量型量具 Ramp。 6
What is the shortterm process capability? What is the longterm process capability?
Are these good or bad values?Remember, one goal of Six Sigma is toreduce variation, which will increasecapability. It is always important tounderstand the process capability. Preparing Data for Marginal Plot by “Slot”
Marginal plots require both variables to be defined numerically
We need to convert “Slot” to a numeric column first
Step 1: Convert “Slot”
ManipCodeText to NumericManip Code Text to NumericMultiVari Analysis – Defined
A graphical analysis tool Uses logical subgrouping
Analyzes the effects of discrete X’s on continuous Y’s
A capability and process analysis tool
Data collected for a relatively short time
Data can estimate capability, stability, and y = f(x)’s
Major focus: study uncontrolled noise variation first Variation in noise variables produces chronic and acutemean shifts, changes in variability, and instability
Noise variation must be reduced or eliminated in order toleverage the important controllable variables systematicallyMultivari analysis is a very useful toolfor graphically identifying sources ofvariation, especially noise variation. Laterthis week, we will be studying correlation amp。 DetectionFMEA Examples
Plating ExampleAn aerospace plating pany was shipping product to itscustomers with nickel plating that was too thin. Parts were failingcorrosion testing at the customer.
Shipping ExampleThe shipping department of an electronics pany is unable toship an assembly without its clam shell protective packaging. Thiscauses occasional late shipments to the customer.
In the following examples, a single line from the FMEA is used as anillustration for each of the above examples. 圖形技術(shù)分析:Graphical MethodsProcess Variation
Noise variation from discrete inputs
Different operators, machines, setups
Different days, shifts
Different batches, mixtures, raw materials
Noise variation from continuous inputs
Ambient temperature, humidity, pressure
Wear, drift, erosion, chemical depletion) ,..., , ( 2 1 k Process x x x f y =) ,..., , ( 2 1 k Noise n n n f +Intentional Unwanted The equation just means that any output isdetermined by the intentional process settingsand the unwanted noise variation.Common Classification of Noise Variables
Positional (within part variation) Variation within a single production unit
Thickness variation across a plated part Variation across a unit containing many parts
Variation across a semiconductor wafer with many die Variation by position in a batch process
Cavitytocavity variations in an injection molding operation
Cyclical (parttopart variation) Variation between consecutive production units Batchtobatch average differences – consecutive batches
Temporal (timetotime variation) Shifttoshift, DaytoDay, Setuptosetup Variation not accounted for by Positional or Cyclical2 2 2 2Temporal Cyclical Positional Noise σ σ σ ++=Graphical Analysis – Example
Injection molding is used to make a type of socket, four pieces at a time, onepiece per slot. Measurements of the sockets consist of thickness values inexcess of millimeters. The gauges measure in hundredths of amillimeter. The specification is 11 177。R 使用方法說(shuō)明:1，校準(zhǔn)量具或確認(rèn)最近校準(zhǔn)仍然有效2，收集10個(gè)代表工藝偏差全部范圍的樣本3，從每日使用這種測(cè)量方法的員工中選出檢驗(yàn)員4，運(yùn)用 ClacMake Patterned Data 準(zhǔn)備量具研究數(shù)據(jù)表5，讓員工測(cè)量所有無(wú)標(biāo)識(shí)，隨機(jī)次序的樣本6，分別讓另外其他員工測(cè)量所有無(wú)標(biāo)識(shí)，隨機(jī)次序的樣本7，重復(fù)第五步及第六步循環(huán)三次。標(biāo)準(zhǔn)化分?jǐn)?shù)如果員工時(shí)常與標(biāo)準(zhǔn)不一致，則需要改變測(cè)量系統(tǒng)（或局部標(biāo)準(zhǔn)）工藝能力分析:為何測(cè)量工藝能力?使我們根據(jù)數(shù)據(jù)分配資源！ （這可不常見(jiàn)?。┤毕萋实靡粤炕_認(rèn)可以改進(jìn)機(jī)會(huì)分析工藝能力可使組織預(yù)測(cè)其所有產(chǎn)品和服務(wù)的真實(shí)質(zhì)量水平確認(rèn)工藝發(fā)生問(wèn)題的本質(zhì)居中程度或分散度*6mman, machine ,method, measurement, mother nature (environment)(6M:人員，機(jī)器，測(cè)量方法，原材料，環(huán)境)《6 Sigma項(xiàng)目運(yùn)作實(shí)例》《測(cè)量階段》如何進(jìn)行項(xiàng)目描述如何進(jìn)行項(xiàng)目描述: 1，目標(biāo)陳述2，Metric 圖3，月節(jié)省額如何繪制工藝流程圖:召集小組:流程圖繪制是集體努力的結(jié)果小組包括：流程負(fù)責(zé)人：項(xiàng)目結(jié)果的負(fù)責(zé)人工程部門(mén)工藝，產(chǎn)品，設(shè)計(jì)及設(shè)備生產(chǎn)部門(mén)操作員，各班次主管，培訓(xùn)員，操作班長(zhǎng)，維修技師流程圖所需信息腦力風(fēng)暴觀察/經(jīng)歷操作手冊(cè)工程標(biāo)準(zhǔn)，工作指示六大方面（人，機(jī)，方法，測(cè)量，材料，環(huán)境）6，完成目標(biāo)陳述。b5黑帶的第一個(gè)項(xiàng)目必須滿足培訓(xùn)目標(biāo)《6 Sigma項(xiàng)目運(yùn)作實(shí)例》《定義階段》我們?cè)诙x階段做什么我們?cè)诙x階段需要做什么？1，完成項(xiàng)目陳述。b1減少缺陷的70%b目的《6 Sigma項(xiàng)目運(yùn)作實(shí)例》《定義階段》如何進(jìn)行項(xiàng)目問(wèn)題陳述