spc統(tǒng)計(jì)制程管制-文庫吧
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【正文】 ,查標(biāo)準(zhǔn)常態(tài)分配表(拉普拉斯表)得Z=1.33時(shí),對(duì)應(yīng)值為0.0918,長(zhǎng)度超過16.1cm的支數(shù): 6000*0.0918=550.8四舍五入得551支,方法二:,下述步驟與上同,故略,Ca,Cp不良時(shí)的一般處理方法,1.Ca不良時(shí)的一般處理方法,製造單位為主, 技術(shù)單位為副, 品管單位為輔.,2.Cp不良時(shí)的一般處理方法,技術(shù)單位為主, 製造單位為副, 品管單位為輔.,,制程能力指數(shù)CpK 綜合Ca與Cp兩值之指數(shù),(1)CpK值之計(jì)算式有兩種,B. 單邊規(guī)格時(shí):,(2)等級(jí)判定 CpK值愈大,品質(zhì)愈佳.依CpK值 大小分為五級(jí),等級(jí),A,1.33 ≦ CpK1.67,B,C,D,CpK值,1.00 ≦ CpK1.33,0.67 ≦ CpK1.00,CpK0.67,A+,1.67 ≦ CpK,A. 雙邊規(guī)格時(shí):,CpK之處置原則,制程能力與規(guī)格之關(guān)系,或6σ’代表制程在正常狀態(tài)下變化之範(fàn)圍,稱為自然公差(Natural tolerance)規(guī)格上下限之差為SuSL,則 或6σ’與SuSL有下列三種關(guān)系(情況)如圖示:,1. 6σ’ SuSL,2. 6σ’ ≒ SuSL,3. 6σ’ SuSL,Evaluation form,Cpk為什麼要大於或等於1.33 ?,1.Cp=0.67時(shí),穩(wěn)態(tài)控制下不合格品率為4.6%。,2.Cp=1.00時(shí),穩(wěn)態(tài)控制下不合格品率為0.27%。,3.Cp=1.33時(shí), 穩(wěn)態(tài)控制下不合格品率為0.0063%=63PPM,在圖例上表示為中心沒有偏移 (實(shí)際中心值與規(guī)格中心重合),μ,DPPM,DR=DRL+DRR DR(Defect Rate):總不良 DRL (Defect Rate Left) :左不良 DRR (Defect Rate Right) :右不良,Table 1 Quality levels and Corresponding Number of Defects,Six Sigma 有多小?,Table2.The Number of Defective(Parts per Million)for Specified OffCentering of the Process and Quality Levels,,中心偏離時(shí)dppm的計(jì)算,offcenter(σ),面積,z,常態(tài)曲線下之面積,e=2.718.,0,Z=(x 181。)/σ,投影片 16,制程能力研究之應(yīng)用,1.對(duì)設(shè)計(jì)單位提供基本資料。 2.分派工作到機(jī)器上。 3.用來驗(yàn)收全新或翻新調(diào)整過的設(shè)備。 4.選用合格的作業(yè)員。 5.設(shè)定生產(chǎn)線的機(jī)器。 6.根據(jù)規(guī)格公差設(shè)定設(shè)備的管制界限。 7.當(dāng)制程能力超越公差時(shí),決定最經(jīng)濟(jì)的作業(yè)水準(zhǔn)。 8.找出最好的作業(yè)方法.,Item,No.,Quality,Level,Specification,Format,LSL,USL,DRL,(Dppm),DRR,(Dppm),DR,(Dppm),1,1 Sigma,181。177。1 Sigma,42.804,42.753,42.855,158655.26,158655.26,317310.52,2,1.5 Sigma,181。177。1.5 Sigma,42.804,42.727,42.880,66807.23,66807.23,133614.46,3,2 Sigma,181。177。2 Sigma,42.804,42.702,42.906,22750.06,22750.06,45500.12,4,2.5 Sigma,181。177。2.5 Sigma,42.804,42.676,42.931,6209.68,6209.68,12419.36,5,3 Sigma,181。177。3 Sigma,42.804,42.650,42.957,1349.97,1349.97,2699.93,6,3.5 Sigma,181。177。3.5 Sigma,42.804,42.625,42.982,232.67,232.67,465.35,7,4 Sigma,181。177。4 Sigma,42.804,42.599,43.008,31.69,31.69,63.37,8,4.5 Sigma,181。177。4.5Sigma,42.804,42.574,43.033,3.40,3.40,6.80,9,5 Sigma,181。177。5 Sigma,42.804,42.548,43.059,0.287105,0.287105,0.57,10,5.5 Sigma,181。177。5.5 Sigma,42.804,42.523,43.084,0.019036,0.019036,0.04,11,6 Sigma,181。177。6 Sigma,42.804,42.497,43.110,0.00099,0.00099,0.00,Prepared by :VQM /Xu Gang,Approved by: Howard Lin,B.Quality Level (For your reference and choosing),,,,,,181。,,,,Times,Quality,Lev
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