数型R&R之讲解与达用表.ppt

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1、Attribute Measurement Systems計數型測量系統,Attribute Terminology 計數術語,Attribute Data:計數型數據 Qualitative(go/no go)data that can be counted for recording and analysis 可用作記錄或分析的定性數據(通常為合格/不合格)Attribute Measurement System(AMS):計數型測量系統 A measurement system that compares a product to a standard and accepts the p

2、roduct if in meets the standard.將每一產品與標準對比,如果符合標準的要求則接受 Can be inspected by an inspection or by using a go/no go gauge 可由檢驗員或合格/不合格量規來實施檢查Screen:篩選 100%inspection using an AMS 用計數測量系統百分百評價產品,Attribute Terminology 計數術語,Screen Effectiveness:篩選效率 The ability of the AMS to discriminate good from bad AMS

3、 區分合格與不合格產品的能力 Customer Bias:客戶偏好 Screening criteria is too tight:Good product is being rejected 篩選標準太嚴格:合格產品被拒收 Producer Bias:生產者偏好 Screening criteria is too loose:Defective product is being accepted 篩選標準太寬鬆:不合格產品被接收,The Purpose of Attribute R&R計數值R&R的目的,To understand if workers across all shifts,m

4、achines and lines use the same criteria to determine“pass”or“fail”確定各班次、各機器、各流水線的檢驗員是否用同一標準區分 合格與不合格.To quantify the ability of inspectors or gauges to repeat their inspection results and conclusions 量化測量者或測量儀器是否能正確重复檢驗結果的能力,The Purpose of Attribute R&R計數值R&R的目的,To understand the level of conformanc

5、e to a standard 確定檢驗員/量儀符合標準的程度,包括:The frequency where inspectors ship truly defective product(Producer Bias)檢驗員接受不合格產品的概率 The frequency where inspectors do not ship truly acceptable Product(Customer Bias)檢驗員拒收合格品產品的概率,The Purpose of Attribute R&R計數值R&R的目的,Identify the following:識別以下各項 Training need

6、(Individual(s)or for all)培訓需求(個別或全部檢驗員)The lack of documented procedures or control plans 缺少程序或控制計劃 Whether standards are clearly defined 標準沒有清晰定明 Adjustment or correlation of gauges 量儀需要調整或進行相關對比,Points for Attribute Measurement Systems計數測量系統應注意事項,Attribute data is normally generated from screening

7、 of product 計數值通常在篩選產品中產生100%product screening is conducted when the process is incapable of meeting the required acceptable level 100%產品篩選通常是在過程不能以高比例生產合格產品的 時,實施As a result,many borderline products(both good and defective)may occur 因此,將生產大量的邊界產品(合格或不合格產品),Points of Attention for Attribute Measurem

8、ent Systems計數測量系統應注意事項,Variation exists in any measurement system,inspection and operational process.This will lead to the acceptance of truly defective products or rejection of truly acceptable products.很多測量系統,檢驗和運作過程都存在變異,這導致大量合格產品的 拒收或大量不合格產品的接受,As a result,we should Focus on improving theProcess

9、 capability and Not on improving the Screening systems因此我們應該將重點放在改進系統能力而非完善篩選系統,The Methods for Conducting Attribute R&R計數 R&R方法,Select a minimum of 30 products from the process 從過程中選取至少30件產品 There will be products in the study where they are 在我們選出做分析的產品中應包括下列產品:Defective 不良品 Defect free 無缺陷產品 Margi

10、nal cases 邊緣產品,The Methods for Conducting Attribute R&R計數 R&R方法,2)Select the inspectors(who should be qualified and experienced)and the gauges 挑選檢驗員和量儀.檢驗員應具有經驗和資格3)Let the inspectors,independently and in random order,inspect the products and determine whether they pass or fail.Repeat this process 讓

11、每位檢驗員獨立以隨機的次序檢驗這些產品並確定合格與否,重复.,The Methods for Conducting Attribute R&R計數 R&R方法,4)Enter the data into the Attribute R&R.Excel spreadsheet or Minitab to calculate the effectiveness of the AMS 將數據輸入至Attribute R&R.Excels工作表或Minitab 報告MSA的檔案5)Record the results and review the process.記錄結果.如果要采取恰當的措施修正檢驗

12、過程6)Prepare the study to verify the action taken.重新進行分析,以驗證修正措施,Attribute R&R-Worksheet計算R&R-方法1利用Excel表,Appraiser Score=檢查員自身一致次數總次數Score vs.Attribute=檢查員檢測結果与已知標準相符的次數總次數Screen Effective score=所有檢查員有一致性的次數總數次Screen Effective Score VS.Attribute=所有檢查員與標準相一致次數總次數,Definition of Terminology for Attribu

13、te R&RExcel Spreadsheet 例題解析,Appraiser Score in the consistency within one person.檢驗員的評分(%Appraiser Score)評價的是個人的一致性（重复性）score vs.Attribute is a measure of how well the operators evaluation agrees with that of the“expert”.檢驗員評分比較標準(%Score vs.Attribute)評價的是檢驗員和“專家”評價相符的程度Screen%Effective Score is a m

14、easure of how well the inspectors agree with each other.檢驗員之間的有效評分(Screen%Appraiser Score)評價的是檢驗員之間的一致性（再現性）Screen%Effective Score VS.Attribute in an overall measure of consistency between inspectors and agreement with“expert”.檢驗員之間有效評分再比較標準(Screen%Effective Score vs.Attribute)綜合評價全部檢驗員和專家的一致性,越接近10

15、0%越好,Guidelines for Selecting MSA Samples MSA樣本指南,Usually about 30 samples,2-4inspectors(if several inspectors use the gauge),2-3 trials 通常要大概30個樣本，2-4個檢驗員(如果多個檢驗員使用量儀),2-3次檢驗Depending on the purpose of the study 1 or more gauges will be used 根據研究的目的，可用個或多個量儀Select enough samples such that number of

16、 samples x number of inspectors/gages15 一般來說，選擇足夠的樣本使樣本數目檢驗員數目量儀數目15SAMPLE SELECTION 樣本選擇Option 1:if process variability is unknown,the samples selected should cover the full range of the normal process/product variation(go get TV)選擇1:如果過程變異未知，樣本應包含正常過程/產品變異的全部範圍(以獲得TV)Option 2:if process variabilit

17、y is Known,the samples selected should uniformly span beyond the width of the specifications.選擇2:如果過程變異已知，樣本應在規格範圍內平均分布,Attribute R&R-Using Minitab 計量R&R-方法2利用Minitab,打開：“Attribute MSA.mtw”,Attribute R&R-Using Minitab 計量R&R-方法2利用Minitab,填寫完后,點“ok”喔!,Attribute R&R-Using Minitab 計量R&R-方法2利用Minitab,Att

18、ribute R&R-Using Minitab 計量R&R-方法2利用Minitab,Within Appraisers Assessment AgreementAppraiser#Inspected#Matched Percent 95%CI1 14 14 100.00(80.74,100.00)2 14 11 78.57(49.20,95.34)3 14 14 100.00(80.74,100.00)#Matched:Appraiser agrees with him/herself across trials.Each Appraiser vs.Standard Assessment

19、AgreementAppraiser#Inspected#Matched Percent 95%CI1 14 11 78.57(49.20,95.34)2 14 9 64.29(35.14,87.24)3 14 10 71.43(41.90,91.61)#Matched:Appraisers assessment across trials agrees with the,Attribute R&R-Using Minitab 計量R&R-方法2利用Minitab,Assessment DisagreementAppraiser#pass/fail Percent#fail/pass Perc

20、ent#Mixed Percent1 2 28.57 1 14.29 0 0.002 1 14.29 1 14.29 3 21.433 1 14.29 3 42.86 0 0.00#pass/fail:Assessments across trials=pass/standard=fail.#fail/pass:Assessments across trials=fail/standard=pass.#Mixed:Assessments across trials are not identical.Between Appraisers Assessment Agreement#Inspected#Matched Percent 95%CI 14 8 57.14(28.86,82.34)#Matched:All appraisers assessments agree with each other.All Appraisers vs Standard Assessment Agreement#Inspected#Matched Percent 95%CI 14 6 42.86(17.66,71.14),THE END,