量测系统分析实例讲义

2.直線性(Linearity):量具取不同規格精度時的偏移之差;1.偏移(Bias):觀察平均值與實際平均值之差量,需以較精密量具改進;實際值觀測平均值偏移(A)(B)直線性大偏移小偏移一.量測系統誤差的分類GR&R觀測者平均值3.穩定性(Stability):因環境改變,動力波動,量具磨損等,不同時間所造成之差量;重複性(D)同一操作員同一量具同一物體4.重复性(Repeatability):一人使用同一量具多次量 測同一物性之差量;(C)穩定性Time 1Time 2GR&R操作員b(E)再現性同一量具同一物體 不同操作員操作員a操作員c5.再現性(Reproducibility):不同人所量測同一物性多次平均之間的差量.備注:由于Bias,Linearity及Stability對量測系統造成的誤差很小,故給予忽略不計.GR&R二.為什麼要做量測系統分析4.評估量具間的差異.8.幫助挑選量測設備.1.防止良品被判退.2.防止不良品被接收.3.增強客戶的信心.5.提升量測技術.6.確認量測人員的資格.7.評鑑量具的量測能力.三.應用範圍4.GO&NG量具,限度樣品.1.量測設備.2.測試設備.3.檢測設備.GR&R四.何時需做GR&R1.新設備.3.客戶要求.5.訓練雇員.7.新量具.五.基本規則1.選擇正確的量測系統.3.零件必須從制程中獲取.5.操作員正常操作設備.2.重點呎寸.4.加嚴公差.6.推定制程條件.8.機械能力研究.2.選擇零件的重點呎寸.4.零件必須被編號且具備隨 機性.GR&R六.變化的來源1.操作員間的差異.3.物料的差異.七.執行量測系統分析的原因1.評定量具的量測能力.3.評監量測方式.2.設備的差異.4.客戶和廠商間的差異.2.比較不同的量具.4.評估校驗前後的差異.GR&R(一).不考慮PV 1.重複性(Repeatability)-Equipment Variation(EV)EV=R*K1 TrialsK124.5633.05式中:R=(Ra+Rb+Rc)/3(Trials為3組時)或 R=(Ra+Rb)/2(Trials為2組時)八.計算公式GR&R3.R&R=22AVEV 6.%R&R=100(R&R/T)%4.%EV=100(EV/T)%5.%AV=100(AV/T)%2.再現性(Reproducibility)-Appraiser Variation(AV)AV=Xdiff*K2 AppraisersK223.6532.70式中:Xdiff=Max(Xa,Xb,Xc)-Min(Xa,Xb,Xc)或 Xdiff=Max(Xa,Xb)-Min(Xa,Xb)(Trials為3組時)(Trials為2組時)GR&R(二).考慮PV(供參考)1.重複性(Repeatability)-Equipment Variation(EV)EV=R*K1 TrialsK124.5633.05式中:R=(Ra+Rb+Rc)/3(Trials為3組時)或 R=(Ra+Rb)/2(Trials為2組時)GR&R 2.再現性(Reproducibility)-Appraiser Variation(AV)AppraisersK223.6532.70式中:Xdiff=Max(Xa,Xb,Xc)-Min(Xa,Xb,Xc)或 Xdiff=Max(Xa,Xb)-Min(Xa,Xb)(Trials為3組時)(Trials為2組時)/()2*(22nrEVKXdiffAV=n=number of partsr=number of trialsGR&R3.R&R=22AVEV 4.Part Variation(PV)PV=Rp*K3PartsK323.6532.7042.3052.0861.9371.8281.7491.67101.62GR&R 8.%R&R=100(R&R/TV)%6.%EV=100(EV/TV)%7.%AV=100(AV/TV)%5.TV=22)&(PVRR9.%PV=100(PV/TV)%GR&R實例(1)GR&RCalculation Worksheet Version:2.0Part/Asm.Name Gauge Name CharacteristicGauge No.Specification Gauge Type OperatorSample No.12345678910TotalsRA=RB=RC=接受條件:a.0R&R%1 0%可接受b.10%R&R%3 0%條件接受c.30%R&R%不可接受,待修理,再教育,或用其他量測EV=EV%=EV/T=AV=AV%=AV/T=R&R=(AV2+EV2)1/2R&R%=R&R/T=Conclusion:核準核準:審核審核:經辦經辦:0.0200.00024.2300.0200.0100.0102.4200.02024.27024.28024.30024.3100.0702.4302.44029.68%0.1202.42800.0224UCLR=XB26.43%13.50%0.029680.008672.42730.01350.026430.0050024.270R=Xdiff=XA24.3200.07024.320XC2.432324.3300.0100.0102.4302.4302.4200.00700.01200.00700.0102.4302.4402.4402.4302.4302.4400.0000.0100.0100.0100.0100.0000.0000.0102.4302.4302.4300.0002.4202.4302.4300.0102.4302.4302.4302.4402.4302.4402.4302.4202.4300.0102.4302.4302.4202.4302.4402.4202.4302.4302.4400.0102.4202.4302.4402.4402.4402.4302.4202.4202.4300.0102.4302.4302.4302.4302.4302.4202.4302.4302.4300.0002.4402.4302.4302.4302.4302.4302.4302.4302.4300.0002.4302.4202.4102.4202.4202.4302.4300.0102.4302.4302.4200.0102.4302.4302.4202.4302.4200.0102.4402.4302.4300.0102.4301st Trial3rd Trial1st Trial2.4302.4202.4200.010Range2.4302nd TrialRangeRange2nd Trial3rd Trial1st Trial3rd Trial2nd TrialToleranceMeasurement Unit 曹志敏2.4302.4302.4200.0102.440胡梅英0.1CALIPERI04-050150mmPaper GuideDiameter 2.5+0/-0.1Part No.林娜G R&RPJHRB0024ZA0.01mm(Measurement System/Gauge Capability)實例(2)GR&RCalculation Worksheet Version:1.0OperatorSample No.12345678910TotalsRA=RB=接受條件:a.0R&R%1 0%可接受b.10%R&R%3 0%條件接受c.30%R&R%不可接受,待修理,再教育,或用其他量測EV=EV%=EV/T=AV=AV%=AV/T=R&R=(AV2+EV2)1/2 R&R%=R&R/T=Conclusion:核準核準:審核審核:經辦經辦:(Measurement System/Gauge Capability)G R&RMeasurement Unit 0.01mmGauge No.I04-05Part No.PJHRB0024ZAGauge Name CALIPERTolerance0.1Gauge Type 0150mmRange胡梅英曹志敏1st Trial2nd Trial3rd TrialRange1st Trial2nd Trial3rd Trial2.4302.4302.4200.0102.4302.4202.4200.0100.0102.4202.4302.4200.0102.4402.4302.4302.4202.4302.4200.0102.4302.4302.4200.0100.0202.4302.4302.4300.0002.4302.4202.4102.4302.4302.4200.0102.4302.4302.4300.0000.0002.4202.4202.4300.0102.4302.4302.4302.4302.4402.4200.0202.4302.4302.4400.0100.0102.4302.4202.4300.0102.4302.4302.4202.4302.4402.4200.0202.4202.4302.4300.0100.0102.4302.4302.4300.0002.4302.4302.44024.27024.27024.2800.0700.00700.01200.12024.23024.31024.3002.42800XB=2.42733XA=R=0.00950UCLR=0.03110.00240.04339Xdiff=0.000670.04332Part/Asm.Name CharacteristicSpecification Paper GuideDiameter 2.5+0/-0.143.32%2.43%43.39%1.0R&R%10%可接受2.10%R&R%30%3.30%R&R%條件接受,基於量具成本,維護費用的考量不可接受,須馬上改善1.AV過大可能原因:a.操作人員技術不熟練.b.量測方式不當.c.刻度盤不清晰,造成讀數產生誤差.九.判定及接受原則十.AV及EV過大的可能原因GR&R2.EV過大可能原因:a.量具不合要求,需重新嚴格地設計.b.量具需維護.GR&Rd.量具所用夾具或所處場所應被改善.c.產品的差異太大.