按一下以編輯母片標題樣式,按一下以編輯母片,第二層,第三層,第四層,第五層,*,設計失效模式及效,应分析,Design Failure Mode,&Effect Analysis(DFMEA),1,FMEA Definition/FMEA,定义,An FMEA can be described as a systemized group of activities intended to:失效模式及效应分析是一组有系统的行为,其目的是:,Recognize and evaluate the potential failure of a product/process and its effects 区分与评估产品及其工艺的潜在失效模式,以及由此产生的效应,Identify actions which could eliminate or reduce the chance of the potential failure occurring,and 找出行动方案来避开潜在失效的发生,或降低其可能性,Document the process 将以上过程记录在案,2,FMEA Flow/FMEA,流程,Boundary Diagram,Interface Matrix,P-Diagram,FMEA,(with Robustness Linkage),Robustness&Reliability Checklist,Design Validation Plan(DVP),Qualifies and clarifies the relationships between systems,Identifies and quantifies the strength of system interactions,Identifies noise and control factors and error states,Summarizes error states,noise factors,and associate design control,3,Magna Closures Required FMEA Related Documents,Boundary Diagram,P-Diagram,CC/SC/KC,Product Characteristic Matrix,FMEA Checklist,Interface Matrix,DFMEA,Process Flow Diagram,PFMEA,DVP&R,4,A Boundary Diagram Example,(U204 Liftgate Latching System),Liftgate Latch Assembly,Ajar Switch,Brainplate,Lock Actuator,Plastic Security Shield,Glass Latch,O/S Handle Assembly w/Rod,Wire Harness,GEM,Assembly Plant,Owner/Operator,Vehicle Body,Inner Door Trim,Water Shield,Door Seal System(door effort),Striker Assembly,C-pillar sheet metal with paint,Fasteners,Window Glass clearance,Sheet Metal Outer,FCSD(Service),Fasteners,5,A P-Diagram Example,(U204 Liftgate Latching System),U204 Liftgate Latching System,Signal Factors,1)Door Slam Engergy,2)Handle release effort Liftgate,3)Handle release travel Liftgate,4)Handle release effort Glass,5)Handle release travel Glass,6)Outside release handle cycling,Control Factors,Latch material selections,-Frameplate,-Housing,-Ratchet&Pawl,Ratchet&pawl heat treat:36-42 HRC,Component finish,Spring material selection,Ideal Function Response,1)Latch releases,2)Latch retains striker fully,Error State Response,1)Latch no function,2)Striker not aligned with latch,3)Striker not properly engaged,4)Gap issues with trim,5)High/low release effort,6)High/low release travel,7)Inside/outside release handle not functioning,Noise Factors,Piece to piece:,1)Handle effort 68.6 N Max,2)Handle travel 20 29 mm,3)Door panel hole tolerance,4)Door dimensional variation,5)Release rod,6)4-way locator body,Customer Usage:,1)Handle cycle loads/Abuse,2)Door slam speed,Sub-system interaction:,1)Inner/outer sheet metal,2)Latch assembly,3)Outside release handle assy,4)Linkage,5)Electrical connector,Aging/Wear Effect:,1)Fatigue,2)Creek,3)Impact durability,4)Corrosion,Environment:,1)Temperature,2)Humidity,3)Dust,4)Vibration,5)Ice,6,An Interface Matrix Example,(Headlamp),P,E,I,M,P:Physical touching E:Energy Exchange,I:Information Exchange M:Material Exchange,Numbers in each corner represent the above interface types,with value denoting the following:,+2:Interaction is necessary for function,+1:Interaction is beneficial;but not absolutely necessary for functionality,0:Interaction does not affect functionality,-1:Interaction causes negative effects but does not prevent functionality,-2:Interaction must be prevented to achieve functionality,Negative values are analyzed for recommended functions.,7,DFMEA,设计失效模式及效应分析,Design Potential FMEA is:设计潜在失效模式及效应分析是:,an analytical technique used primarily by Design-Responsible Engineer/Team 由负责设计的工程师/小组承受的分析技术,to identify potential failure modes用作区分潜在失效模式,to identify associated cause/mechanisms区分相关缘由/机理,to support the design process in reducing the risk of failures支持设计过程,削减失效风险,apply to system,subsystem,and component应用于系统、子系统及部件,8,Customer of DFMEA,顾客的定义,Customer for a Design FMEA,顾客的定义,End user,通常是指“最终使用者”,Manufacturing/Process-responsible engineer,也可以是更高一层设计司，制造或装配生产工程司,9,Team Effort 小组的努力,Design 设计,Manufacturing 制造,Quality 品质,Material 材料,Reliability 牢靠性,Sub-contractor 分供方,10,DFMEA,设计失效模式及效应分析,Design FMEA is LIVING document and should,设计FMEA是一份动态的文件,be initiated before or at design concept finalization 在一个设计概念最终形成之时或之前开头,be continually updated在产品开发的各个阶段,发生更改或获得更多的信息时,持续予以更新,be fundamentally completed before production drawing release在产品加工图样完工之前全部完成,11,DFMEA,设计失效模式及效应分析,Assumption:Design will be manufactured/assembled 假设:该设计将按此意图进展生产,Potential failure modes during production“Need Not”but“May Be”included制造的失效模式“不需”但“也可能”包括,DFMEA not rely on process controls to overcome design weaknessDFMEA不依靠过程把握来抑制潜在的设计缺憾,DFMEA considers technical limits of manufacturingDFMEA考虑制造的限制,Mold drafts 拔模斜度,Assembling space 装配空间,Tolerances /capability 公差/过程力气,12,Development of a Design FMEA 设计FMEA的开头,First Step of DFMEA:IDENTIFY DESIGN INTEND第一步:确定设计意图,“Listing of what design is expected to do and,what is expected not to do”,“,列出设计期望做什么和不期望做什么,?,13,Development of a Design FMEA设计FMEA的开头,Source of information 资料来源,QFD 质量功能开放,Product Requirement 产品要求,Manufacturing requirement 生产要求,“Design Intent”“设计意图”,14,Block Diagram 框图,DFMEA Recommended tool:Block Di