【质量管理精品文档】SPCtraining

1、SPC TRAINING SPC 统计制程控制StatisticalAnything that deals with the collection, analysis, interpretation & presentation of numerical data Gaining information for making informed decisionsProcessCombination of machines, tools, methods, materials & people employed to attain process specificationA similar p

2、rocedure/event that is happening repetitivelyControlTo keep something within a desired conditionMake something behave the way we want it to behaveThe use of statistical techniques such as control charts to analyze a process, take appropriate actions to achieve & maintain a stable process, & improve

3、process capability.1SPCTRAININGClassificationsofcontrolchartsare dependingonthetypeofdataVariablesdataA characteristic measured on acontinuousscaleresultinginanumericalvalueExamples:WirePull,Ball Shear Strength,Coplanarity, BallHeight,etc.Attributes dataA characteristic measured by #ofconforming& no

4、n-conforming to aspecification.Outputisclassified aspass/failoraccept/reject.E.g. BrokenWire,LiftedBond,FM, Chipping,Bent Lead,etc.Canbeexpressed in terms of fraction,percentage,countorDPMClassificationsofcontrolcharts2Control ChartConsistsofTwoPortions:X ChartPlotsthemeanoftheXvaluesinthe sampleSho

5、wsthechangesofthemeanofonesample to anotherR ChartPlotstherangeofasampleShowsthechangesindispersion or processvariabilityofone sampletoanother3Control ChartSymbolDescriptionSample SizeX - RXMean of SampleMust Be Equal(Mean-Range) ChartRRange of SampleMust Be EqualX (Individual Chart)XIndividual Meas

6、urementOneX - S (Mean-StandardXMean of SampleMust Be Equal Deviation) ChartSStandard Deviation of SampleMust Be Equal Control ChartsForVariables4Control ChartsForAttributes5When to usedifferentcontrolchart(Guidelines only) Control Chart When to Use (Guidelines only)? X-R - when subgrouping of sample

7、s or (Mean-Range) Chart measurements is applicable - n 106SPCTRAINING按照CONTROL PLAN上规定,如WIRE PULLTEST:Once/shift,andafterdevice change,capillary change,and after machinerepair;10WIRES/UNIT.X Bar&RCHART.何时/如如何收集集数据7如何计算算平均值值,极差X BAR& RCHART参数计算算对于k组样本,每组抽样样量均为为n的数据Xi=(X1+X2+.Xn)/n(i=1k)Ri=Xmax-Xmin(i

8、=1k)X BARCHART的中心线线(CENTERLINE)Xbarbar=(Xbar1+Xbar2+Xbark)/KR CHART的中心线线(CENTERLINE)R bar=(R1+R2+Rk) /k8对于X BARCHART的控制线线UCL/LCL=Xbarbar+/-3sigma对于R CHART的控制线线UCL/LCL=Rbar+/-3sigma*进行控制制线计算算时，至至少已已收集了了25组组数据。Ppk=(USL-Xbarbar)/3S orPpk=(USL-Xbarbar)/3S取较小者者X BAR&RCHART的控制线线 &PPK9如何绘制制在X BAR-R图表按收集的的X

9、，R的数据，计算每每组的Xi和Ri，根据控制制线确定定在X BAR-R CHART图上的位位置，点点上点，然后连连线。104.SPC判断原则则为哪些些UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)11有一点落落在控制制界限外外；Upper ControlLimit (UCL)Center Line(CL)Lower ControlLimit (LCL)12有连续的的7点递增或或递减Upper ControlLimit (UCL)Center Line(CL)Lower ControlLimit (LCL)13有连续的的7点位

10、于中中心线同同侧UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)14有明显的的非随机机图形的的出现；15发生OOC时,如何处理理停止处于于失控状状态的机机器的生生产按照OCAP的指示进进行相应应的处理理重新测数数据，直直到新的的数据得得到控制制，才能能继续生生产16通过QI监控OOC17WARNINGS:Group/ Summarywillsort thenewtableinalphabetical order of thegroupingvariable.Control chartsmust alwaysbeplotted in timeorder.Therefore, if thesummary table is notintime order,youwillhave