Statistical quality controlSampling inspectionTest designReliabilityFailure Modes and EffectsAnalysis(FMEA)2007.4Statistical techniques11
2007.4 11 Statistical techniques Statistical quality control Sampling inspection Test design Reliability Failure Modes and Effects Analysis(FMEA) •••••
Sampling inspectionRandomly drawn products of reserved sample size from eachbatch of products that are handing over, Ifthe numberof nonconforming products of sampleislessthanthesampling scheme prescribedthen determine this batch ofproducts are qualified, and allow to receive, otherwise,refused to acceptTest designBased on probability theory and mathematical theoryand linear algebra,scientifically arrange test planCorrectly analysis test results , is a mathematicaltheory and method that can obtain a optimizationscheme as soon as possible2007.4Statistical techniques12
2007.4 12 Statistical techniques Sampling inspection Randomly drawn products of reserved sample size from each batch of products that are handing over, If the number of nonconforming products of sample is less than the sampling scheme prescribed,then determine this batch of products are qualified, and allow to receive, otherwise, refused to accept Test design Based on probability theory and mathematical theory and linear algebra ， scientifically arrange test plan ， Correctly analysis test results ，is a mathematical theory and method that can obtain a optimization scheme as soon as possible
ReliabilityReliabilityistheabilityof fulfillingthe specified function that refersto theconditionsand specificationsof the products withintheprescribedperiodoftimeReliabilityindex:reliability,failurerate,thefailuredensityfunction,the lifedistributionfunction,thereliabilityof the systemmodel,systemreliabilitypredictionand allocation,reliability design, reliabilitymanagement.Failure modeand effect analysis Is a methodof reliabilityanalysis,research the impact and consequences that the products failurehaveon the system work, and every possiblefailure modes are classifiedaccordingtotheharmdegree,andtakethenecessary correctiveactions.2007.4Statisticaltechniques13
2007.4 13 Statistical techniques Reliability Reliability is the ability of fulfilling the specified function that refers to the conditions and specifications of the products within the prescribed period of time Reliability index: reliability, failure rate, the failure density function, the life distribution function, the reliability of the system model, system reliability prediction and allocation, reliability design, reliability management. Failure mode and effect analysis Is a method of reliability analysis， research the impact and consequencesthat the products failure have on the system work ，and every possible failure modes are classified according to the harm degree, and take the necessary corrective actions
Statistical quality control is used to solve the quality problems andimplement process improvements oThey contribute tocollect and analyze data in order to provide the basis for decision-makingCheck table;Association diagramStratification ;System chartScatter diagram ;Matrix graphHistogram;MatrixDataAnalysis MethodControl chart ;Pareto chart ;Process Decision Program Chart ; Bar chart ;KJ methodCause and effectdiagram;2007.4Quality management tools14
2007.4 Quality management tools 14 Check table; Association diagram Stratification ； System chart Scatter diagram ； Matrix graph Histogram ； Matrix Data Analysis Method Pareto chart ; Control chart ； Process Decision Program Chart ; Bar chart ； Cause and effect diagram; KJ method Statistical quality control is used to solve the quality problems and implement process improvements .They contribute to collect and analyze data in order to provide the basis for decision-making
Problem determination and clear improvement goalsCollect dataAnalyze problemsObtainpossiblesolutionsChooseasolutionSolvethequalityproblemCheck solution and explain whetherachieve the goalThe basic steps for solving the quality2007.415problem
2007.4 15 The basic steps for solving the quality problem Problem determination and clear improvement goals Collect data Analyze problems Obtain possible solutions Choose a solution Solve the quality problem Check solution and explain whether achieve the goal