【正文】 lysis and enter the name and number of the system, subsystem, or ponent being analyzed. 注明適當(dāng)?shù)姆治黾?jí)別並填入被分析的系統(tǒng)、子系統(tǒng)或部件的名稱及編號(hào)。1 設(shè)計(jì)失效模式及效 應(yīng)分析 Design Failure Mode Effect Analysis (DFMEA) 2 FMEA Definition / FMEA 定義 An FMEA can be described as a systemized group of activities intended to: 失效模式及效應(yīng)分析是一組有系統(tǒng)的行為 , 其目的是 : (a) Recognize and evaluate the potential failure of a product/process and its effects 辨別與評(píng)估產(chǎn)品及其工藝的潛在失效模式 , 以及由此產(chǎn)生的效應(yīng) (b) Identify actions which could eliminate or reduce the chance of the potential failure occurring, and 找出行動(dòng)方案來(lái)避免潛在失效的發(fā)生 , 或降低其可能性 (c) Document the process 將以上過(guò)程記錄在案 3 FMEA Flow / FMEA 流程 Boundary Diagram Interface Matrix PDiagram 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 4 Magna Closures Required FMEA Related Documents ? Boundary Diagram ? PDiagram ? CC / SC / KC ? Product Characteristic Matrix ? FMEA Checklist ? Interface Matrix ? DFMEA ? Process Flow Diagram ? PFMEA ? DVPR 5 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 Cpillar sheet metal with paint Fasteners Window Glass clearance Sheet Metal Outer FCSD (Service) Fasteners 6 A PDiagram 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: 3642 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 N Max 2) Handle travel 20 – 29 mm 3) Door panel hole tolerance 4) Door dimensional variation 5) Release rod 6) 4way locator body Customer Usage: 1) Handle cycle loads / Abuse 2) Door slam speed Subsystem 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 7 An Interface Matrix Example (Headlamp) InterfaceMatrix:Example ofHeadLamp1 2 1 1 2 21 2 1 1 1 11 1 1 1 22 2 1 1 2H e a d l a m pH e a d l a m p H o u s i n gH o o dG r i l l O p e n i n g P a n e lB o d yC o n n e c t o rW i r i n g / E l e c t r i c a l S y s t e mS c r e w / F a s t e n e rScrew/FastenerWiring/Electrical SystemConnectorBodyGrill Opening PanelHoodHeadlamp HousingHeadlampP 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 remended functions. 8 DFMEA設(shè)計(jì)失效模式及效應(yīng)分析 Design Potential FMEA is: 設(shè)計(jì)潛在失效模式及效應(yīng)分析是 : ? an analytical technique used primarily by DesignResponsible Engineer/Team 由負(fù)責(zé)設(shè)計(jì)的工程師 /小組采用的分析技術(shù) ? to identify potential failure modes 用作辨別潛在失效模式 ? to identify associated cause/mechanisms 辨別相關(guān)原因 /機(jī)理 ? to support the design process in reducing the risk of failures 支持設(shè)計(jì)過(guò)程 , 減少失效風(fēng)險(xiǎn) ? apply to system, subsystem, and ponent 應(yīng)用