DFMEA---失效模式与后果分析.ppt

DFMEA-失效模式与后果分析(DesignFailureModeOrtothenextprocess,theuserandtheinfluenceoftheequipment;Ortoendcustomers,governmentregulations,safety,andenvironmentalprotection,andadefault.,四、DFMEA关键参数DFMEAKeyParameter,严重度Severity,严重度的划分标准-主观判定SeverityClassificationStandard-SubjectivityDecide其大小由失效模式的影响程度而定，以1至10表示等级.Itssizeofthefailuremodeoftheinfluencedegreetodecide,be1to10showlevel.1级最轻微，10级最严重.1Levelbestslight,10Levelbestgrave.1级-几乎不会有什么影响.1Level-Almosthasnoinfluence.10级-违反安全和法规.10Level-Violationofsafetyandregulations.,四、DFMEA关键参数DFMEAKeyParameter,严重度分类SeverityClassify,耐火性、自然性、UL、RHoS50RPN100shouldasfaraspossibletosolve,cantsolvemustbetightenedcontrol;RPN50dontaddcontrol.Whentheseverity(S)orhighincidence(O)isveryhigh,nomatterhowRPNsizewillbeformulatethecorrespondingimprovementorcontrolmeasures,andappointresponsiblepersonsandimprovethecompletiondate.,如何制定改善措施Howtomaketheimprovementmeasures,针对预防/纠正措施，以降低评价等级的内容顺序为：严重度、发生率及侦测度；Aimingatpreventing/correctivemeasures,inordertoreducethecontentoftheevaluationgradeorder:(S),(O),(D).通过设计变更来消除或控制一个或多个失效模式的起因机理，能降低严重度等级；Throughthedesignchangetoeliminateorcontroloneormoreofthecauseofthefailuremodemechanism,canreducetheseveritylevel;透过设计变更，去除或管制某一或多个影响失效模式的原因或设备，只能降低发生率的等级.Throughthechangeofthedesign,removeorcontroloneormoreofthecauseofthefailuremodeeffectorequipment,canreducetheincidenceofgrade.增加设计验证，修改测试计划，修改原物料规格，只可降低难检度.Toincreasethedesignverification,modifyingthetestplan,modifytheoriginalmaterialspecifications,canonlyreducethedifficultdegreeoftest.,五、DFMEA表单填写说明1DFMEANotesoncompletingtheform(1),DFMEA编号：填入DFMEA文件的编号，以便要询；DFMEANumbers:fillintheDFMEAfileNumbers,sothattoinformation;项目：填入所分析的系统、子系统或零件的过程名称，编号；Project:fillintheanalysisofthesystem,subsystemorpartsoftheprocessname,Numbers;设计责任：部门、小组还应包括供方的名称；Designresponsibility:department,theteamalsoshouldincludethenameofthesupplier;填入负责DFMEA工作的工程师姓名、电话及所在公司名称；FillintheresponsibleoftheengineersDFMEAname,phonenumberandthenameofthecompany;填入将使用或正被分析的设计过程影响的预期的机型和料号；Fillinwilluseorarebeinganalyzedtheinfluenceofthedesignprocessoftheexpectedtypeandmaterialnumber;关键日期：填入DFMEA初次预定完成日期，该日期不应超过计划开始设计生产发布日期.Thekeydate:fillintheDFMEAfirsttargetcompletiondate,thisdateshallnotexceedthedesignplantobeginproductionreleasedate.,五、DFMEA表单填写说明2DFMEANotesoncompletingtheform(2),DFMEA日期：填入编制DFMEA原始稿的日期及最新修订日期；DFMEAdate:fillinthedrawupDFMEAdateandlatestrevisiondate.核心小组：列出有权确定和执行任务的责任部门和个人姓名，如果对某一特定原因无建议措施，那么就在该栏中写“N/A”.Thecoreteam:listshallhavetherighttodetermineandimplementtheresponsibilityofthedepartmentandindividualtaskname,ifforAparticularreasonnosuggestedmeasures,thenwriteinthecolumnofN/A.项目/功能：填入被分析项目的名称和编号，若该项目有多种功能，且有不同的失效模式，应把所有功都单独列出.Project/function:fillinthenameoftheprojectareanalyzedandNumbers,iftheprojecthasavarietyoffunctions,andhavedifferentfailuremode,weshouldputallfunctionsarelistedseparately.潜在失效模式：对一个特定项目及其功能，应用规范化，专业性的术语来列出每一个潜在的失效模式前提是这种失效可能发生，但不一定发生.Potentialfailuremode:foraspecificprojectanditsfunction,theapplicationofstandardized,professionaltermstolisteachpotentialfailuremodeprovidedthatfailuremayoccur,butdoesnotnecessarilyoccur.,五、DFMEA表单填写说明3DFMEANotesoncompletingtheform(3),潜在失效后果，就是失效模式对系统功能的影响，一般是客户在使用时看到的状况；Potentialfailureconsequences,isthefailuremodeoftheinfluenceofthesystemfunction,itistoseethecustomersintheuseofthesituation.严重度(S)Severity分级（重要程序）用于对零件、系统、子系统的产品特性分级：关键、主要、重要、轻微等.Classification(importantprogram)forparts,system,subsystemproductcharacteristicsclassification:thekey,major,major,minor,etc.潜在失效的起因/机理：潜在失效模式的起因是指一个设计或工艺薄弱部分的迹象；机理是什么导致失效.Thecauseofthepotentialfailure/mechanism:thecauseofthepotentialfailuremodesistopointtoadesignorprocessunderbellysigns;Mechanismofwhatcausesthefailure.,五、DFMEA表单填写说明4DFMEANotesoncompletingtheform(4),频度是指某一特定失效起因或机理（已列于前栏中）出现的可能性；Occurrenceistopointtoaspecificfailurecauseormechanism(alreadylistedinfrontbar)eventualities;现行的设计，工艺控制，控制的方法指的是那些已经用于或正在用于相同或相似设计中的那些方法.Thecurrentdesign,processcontrol,thecontrolmethodreferstothosewhohaveusedorareusedinthesameorsimilardesignofthosemethods.探测度Detection风险顺序数RPN建议措施：例如：设计变更、过程变更、特殊管控等；如果对某种特定原因无建议措施那么就在该栏中填写“N/A”.Suggestionsandmeasures,suchas:thechangeofthedesign,processchange,specialcontrol,etc.;IfforAspecificreasonnosuggestedmeasurestheninthebartofillinN/A.,五、DFMEA表单填写说明5DFMEANotesoncompletingtheform(5),责任：把负责建议措施执行的组织和个人及预计完成的日期填写在此栏中；Responsibilities:responsiblefortheimplementationoftheadviceoftheorganizationsandindividualsandthedateisexpectedtofillinthiscolumn;采取的措施：跟踪评审，确认和控制计划等，记录具体的措施和生效日期；Takemeasures:trackingreview,identifyandcontrolplan,recordthespecificmeasuresandeffectivedate;纠正后的RPNCorrectedRPN跟踪小组成员应保证所有建议措施或妥善落实；Trackingteammemberssha