The substanceof management process isdata acguisitiontransmission and processing, productis the material expressionofthedata.All speak in data,data is the foundation of quality managementactivitiesIn the process of quality management, we need to collectthequalitydata on purpose,for data,we should sumup,tidy.process and analysis,get information aboutproduct quality or production status,then find thequalityproblemsofproducts and causes of theproblemsin orderto improvetheproduct design,process,ensureand improve the quality of the product.The role of data in quality managementIn product design, manufacturing and sales,all kinds ofdata related to the product quality could provideinformationforpeople,thenhelppeopleknowthe4change law of product quality, to provide the basis ofmeasuresforimproving and guaranteeing the product
2007.4 Data 16 All speak in data, data is the foundation of quality management activities. In the process of quality management, we need to collect the quality data on purpose，for data ,we should sum up,tidy, process and analysis ，get information about product quality or production status，then find the quality problems of products and causes of the problems， in order to improve the product design, process, ensure and improve the quality of the product. The role of data in quality management In product design, manufacturing and sales,all kinds of data related to the product quality could provide information for people，then help people know the change law of product quality, to provide the basis of measures for improving and guaranteeing the product quality . The substance of management process is data acquisition, transmission and processing, product is the material expression of the data
Themaincontentothisclao:1,Understandthemeaningofdata,population,sample,andthegeneralmethodsofrandomsampling;2, Masterthe drawing methodand applicationof paretodiagram,causeandeffectdiagram;3.Masterthe applicationoflayeredmethod,statisticalchartmethod;4、 Understand the principle, functionandconstructionmethodandapplicationofhistogram;The main requirements of this2007.417chapter
2007.4 17 1、Understand the meaning of data,population , sample , and the general methods of random sampling； 2、Master the drawing method and application of pareto diagram, cause and effect diagram ； 3、Master the application of layered method, statistical chart method； 4、Understand the principle, function and construction method and application of histogram； The main requirements of this chapter The main content of this class ：
The data reflect the product specific propertiesThequalityfeaturevaluesoftenshowasallkindsofnumericalindicators,thatisthequalityindicatorsAspecificproductoftenneedtousemultipleindicatorstoreflectitsquality.thevaluegained through measuring thequality index,namedthequalityfeaturevalues,commonlyreferredtoasdata.Accordingto thedifferentpropertiesofqualityindicators,thequalityfeaturevaluescanbedividedintotwocategories, count value and measurementvalueo2007.4Thequalityfeaturevalues18
2007.4 18 • The quality feature values often show as all kinds of numerical indicators，that is the quality indicators. • A specific product often need to use multiple indicators to reflect its quality. • the value gained through measuring the quality index , named the quality feature values, commonly referred to as data. • According to the different properties of quality indicators, the quality feature values can be divided into two categories, count value and measurement value。 The quality feature values The data reflect the product specific properties
countvalue8Whenthequalityfeaturevaluescanonlytakeaspecificsetofvalues,andcan'ttakevaluesbetweenthesenumericalvalues,thesekindof characteristicvaluesarecalledcountvalues。Countvaluescanbefurtherdividedintopiecevalueandpointvalue。Thegeneratedproperties(suchas evaluationofqualifiedandunqualified)dataforinspectingperpieceofproductsis calledpiecevaluethenumberofmassdefectofeachproduct knownaspointvalue。Suchas thenumberof defectson thecotton,sandholesonthe casting,etc。2007.4piecevalueandpointvalue19
2007.4 19 count value: piece value and point value When the quality feature values can only take a specific set of values, and can't take values between these numerical values,these kind of characteristic values are called count values。 Count values can be further divided into piece value and point value。 The generated properties (such as evaluation of qualified and unqualified) data for inspecting per piece of products is called piece value。 the number of mass defect of each product known as point value。Such as the number of defects on the cotton,sand holes on the casting , etc
measurementvalue8Whenthequalityfeaturevaluescantakeanyonepossiblevaluewithinthe scopeof a given value,thiskindofcharacteristic valuearecalledmeasurmentvalues。 Suchasmanykindsofmeasureddata(length,weight,time,temperature,etc.)measured through measurement tools。count value and measurement2007.4value20
2007.4 20 Measurement value: count value and measurement value When the quality feature values can take any one possible value within the scope of a given value, this kind of characteristic value are called measurment values。Such as many kinds of measured data (length, weight, time, temperature, etc.) measured through measurement tools