spc和msa教程ppt课件

1、 SPCStatistic Process ControlStatistic techniqueProcess ControlSPC.由Product Spec 到Process Parameter.由Product Spec 到Process Parameter1. . Basic concept of SPCVariationControl (Stability)-Statistical stable status-Process performance can be predictableCapabilityOver-adjustment.SPC - 品管七大手法HistogramChe

2、ck SheetParetoCause and effect diagramDefect concentration diagramScatter diagramControl chart. Basic concept of SPC檢定能否為常態分配控制圖的中心線 X-bar 控制圖的控制界限(信賴水準,信賴區間)Control Limits =信賴區間 1.集中趨勢通常以X bar 作代表 2.離中趨勢通常以 作代表 3.信賴水準-被含蓋在特定範圍內的機率.信賴水準-被含蓋在特定範圍內的機率X barX bar. 信賴水準,信賴區間 信賴水準 信賴區間 90% 1.645 95% 1.96

3、99% 2.575 99.73% 3 99.94% 3.5 99.99% 3.9 99.994% 3.99 .信賴水準,信賴區間,P, Ppk/Cpk信賴水準P信賴區間Ppk/Cpk90%10%1.6450.54895%5%1.960.65399%1%2.575 0.85899.73%0.27%3 199.94%0.06%3.5 1.16799.99%100ppm3.9 1.399.994%60ppm3.99 1.33. Z. Basic concept of SPC用控制圖判別special cause的準則超過控制界限連續七點向上連續七點向下連續七點向單邊不隨機分佈. Basic conc

4、ept of SPCStatistical stable = no special cause = Under control = process performance can be predictable當製程達到Statistical stable時才可計算Cpk. Stable Process. Unstable Process. Basic concept of SPCOver-adjustment : 當對common cause所呵斥的變異都採取措施調整製程時, 等於將一個special cause参与己穩定的製程。使本来穩定的製程變成不穩定。. Basic concept of

5、 SPCPpkCaCpCpk. Basic concept of SPCCa : Sensitive to Specification targetCp : Sensitive to variation(spread)Cpk : Sensitive to both, capability index for stable process Only common cause variation included Ppk : Performance index Both common cause and special cause variation includedCp Cpk.Basic co

6、ncept of SPCVariation : 製程輸出不可防止的差異Inherent Variation (固有變異):由common cause所呵斥的變異 = R bar / d2Total Variation :由common cause and special cause所呵斥的變異 PpkCpk. Cpm. 控制圖種類包括計量值控制圖計數值控制圖.Data的種類計量值(location & spread)計數值.計量值控制圖X-Bar R ChartX-median R ChartX-Bar S ChartX-Rm Chart.計數值控制圖種類包括 P Pn C U. 控制圖的目的

7、預防不良品產出断定製程能否有非機遇因子呵斥的變異去除非機遇因子呵斥的變異減小製程的變異改善製程断定製程能否穩定製程才干分析100%檢驗還需耍做控制圖嗎?如何做?.特殊應用控制圖CUSUM cumulative-Sum Control Chart)累積和控制圖EWMA exponentially Weighted Moving Average Control Chart)指數加權移勳平均控制圖EVOP (Evolutionary Operation)-Part Average Test漸進操作法控制圖Acceptance Control Chart 允收控制圖Modified Control L

8、imits Control Chart修正界限控制圖Short Run 短製程控制圖.Short Run 短製程控制圖. Guard Band Limit-GRR. Guard Band Limit-Cpk. MSAMeasurement System AnalysisStatistic techniqueMS ControlMSA. MSA. GRR v. s. CP.Accuracy & Precision. MSA計量值 Location - Bias, Linearity, Stability Spread Repeatability, Reproducibility(GRR) Ran

9、ge Method Average Range Method Average Range Method (Within Part Variation) ANOVA DOE計數值-Short Method -Long Method. Bias. Stability. Linearity. Repeatability. Reproducibility. GRR-Average-Range Method%GRR = % R&R = 100(R&R/TV)TV2 = R&R2 + PV2R&R2 = EV2 + AV2 TV2EV2AV2PV2.GRR-Range Method.GRR-Average

10、-Range Method.ANOVA Method.MSA timing & applicationMSA / APQP/ Product RealizationMSA / FMEA. MSA的目的何種情況可不用做GRR ?Cp is good, not use for process measurement, C/I not required?只做GRR, 不做Bias, Linearity, Stability可以嗎 ?汽车基地 qcbase.MSA for measurement cant be repeatedThe inability to test the same unit r

11、epeatedly is a major obstacle to obtaining an estimate of pure measurement error.Destructive testingMeasuring a temperature, viscositySamples obtained from the product stream should be as closed together as possibleWith film, one might prefer adjacent samples collected in the machine direction rathe

12、r than from different positions across the webObtain pairs of samples that are as homogeneous as possible within each pair, each pair may be tested and the difference in the paired readings taken to obtain an estimate of the variation of the measurement process .Data Categories & Resolution.Data Cat

13、egories & Resolution.Data Categories & Resolution.Data Categories & Resolution.Data Categories & Resolution.Data Categories & Resolution.Data Categories & Resolution.Data Categories & Resolution. PT RatioPrecision Tolerance RatioThe ratio of parameter tolerance to measurement system repeatabilityPT=Tolerance /EV.MSA ResultGage resolution to spec toleranceGage resolution to Process variationBias StabilityLinearityR&R.When should MSA be conducted in APQP/Product Realization/Product Life cycleProduct design reviewProcess design reviewPro