ANSI/ASME B18.18-2011 紧固件的质量保证

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【英文标准名称】:QualityAssuranceforFasteners
【原文标准名称】:紧固件的质量保证
【标准号】:ANSI/ASMEB18.18-2011
【标准状态】:现行
【国别】:美国
【发布日期】:2011
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:紧固件;重型机械;检验;锁定装置及定位装置;米制的;质量;质量保证;质量保证体系;抽样方案;试验
【英文主题词】:Fasteners;Heavymachine;Inspection;Lockingandlocatingdevices;Metric;Quality;Qualityassurance;Qualityassurancesystems;Samplingplan;Testing
【摘要】:ThisqualityfocusedStandardestablishesin-processandfinalinspectionrequirementsforfastenerproductsaswellasareceivinginspectionplanforfastenerpurchasers.TheStandardidentifiesfourcategories,recognizingthatfastenerusershavewidelyvaryingrequirements.Inthepreparationofthisstandarditwasrecognizedthatitsfunctionmustenableittobeapartofthevariousregimensinusetodaythatattaincertainqualitylevelsofproducts.Thisstandardwaswrittentoencompassframeworksthatenabletheusertopinpointwhichapproachtheywishtouseinmeetingtheirownobjectives.ThisstandardplacesaC=0expectationsonthesampleplansshownherein,andthesamplesizesaresmallerforthatreason.Howeveritshouldberecognizedthatzerononconformitiesinasamplingdoesnotnecessarilymeanthatthepopulationwasentirelyfreeofdefects.ThisstandardrecognizesthatsomewellestablishedstandardsmaycontinuetouseC=1orhigheracceptancenumbers,andthattheirsamplesizesarehigherasaresult.Whentheconsumerpreferstousethoseplansthatconstitutetheirrequirements,theirplanscansupersedethesamplesizesherein.HoweverthequalityexpectationofC=0isstillrequired.Statisticalprocesscontrolandothervariationloweringmeasurescansignificantlyreducethenumberofnonconformitiesinthepopulationthatmaybeproduced,butitshouldbenotedthatstatisticalindicesonlyimplythequalitylevelproduced,andimproperlyappliedstatisticaltreatmentswillimplythepresenceofnonconformitiesthatarenotpresent,ormisssomedeficienciesaltogether.Theclosestthatonecanapproachthezeropopulationdeficienciesstateisin100%partperpartexamination,butagaincautionmustbeexercised.Thegoalofzeroherecanbeintractableand-thecomplexityofresourcesrequired,-thelimitationsoftheavailableequipmentforeachverifiedcharacteristic,-thestringencyofcontrolsrequired,willonlybeabletodemonstratequalityonapartspermillionbasis,andnotnecessarilyanyassuranceofzerodeficiencies.
【中国标准分类号】:J13
【国际标准分类号】:21_060_01
【页数】:
【正文语种】:英语