设计失效模式及效应分析(DFMEA)

– Mold drafts 拔模斜度 – Assembling space 装配空间 – Tolerances / capability 公差 / 过程能力
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Development of a Design FMEA 设计FMEA的开始 设计 的开始
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?
FMEA Date (Orig.) ______(Rev.)____ehicle(s)____________________
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8 Core Team__________________________________________________________________________________________________________________________
Subsystem Level
Frame Function: –Provides stable attachment for seat support Potential Failure Mode(s) Structural failure seat support Excessive deflection of seat support Function: –Provides pleasing appearance Potential Failure Modes(s) Finish (shine)deteriorates Paint chips
Component Level Upper Frame
Function: –Provides structural support Potential Failure Mode(s): Structural failure Excessive deflection Function: –Provides dimensional control for correct finished frame geometry Potential Failure Mode(s): Length of frame mounting points to long Length frame mounting points too short Function: –Support frame assembly production methods (welding) Potential Failure Mode(s):
Batteries 电池
plate 弹簧 Compressive fit压紧装接 9
________ System
POTENTIAL FAILURE MODE AND EFFECTS ANALYSIS (Design FMEA)
3 Design Responsibility_________________________ 6 Key Date _____________________________
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Block Diagram 框图
DFMEA Recommended tool : Block Diagram
DFMEA建议工具 : 框图
To understand 明白
Housing 灯罩
input to the block 输入
Slip fit 滑动配合
Snap fit 卡扣连接
function of the block 功能 output form the block 输出
Design 设计 Manufacturing 制造 Quality 品质 Material 材料 Reliability 可靠性 Sub-contractor 分供方
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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始 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
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严 重 度 数
频 度 数
R. P. N.
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Details of DFMEA DFMEA的詳細內容 的詳細內容
1) FMEA Number FMEA编号 Enter the FMEA document number, which may be used for tacking. 填入FMEA文件编号, 以便查询。 Indicate the appropriate level of analysis and enter the name and number of the system, subsystem, or component being analyzed. 注明適當的分析級別並填入被分析的系 統、子系統或部件的名稱及編號。
FMEA Number_______________ Page__________o f___________
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________ Subsystem 2 ________Component_________________________
4 Prepared by________________________
Item C l a s s Potential Cause(s) Mechanism(s) of Failure O c c u r Current Design Controls Prevention Current Design Controls Detection
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Function
Potential Failure Mode
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Development of a Design FMEA 设计FMEA的开始 设计 的开始
Source of information 资料来源
QFD 质量功能展开 Product Requirement 产品要求 Manufacturing requirement 生产要求
“Design Intent” “设计意图”
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設計責任_________________________
FMEA 编号_______________
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共__________頁, 第___________頁
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編制人________________________ 4 FMEA 日期 (編制) ______(修訂)_________
車型年 / 車輛類型____________________
關鍵日期 _____________________________
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核心小组__________________________________________________________________________________________________________________________
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O c c
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________ 系统 ________ 子系统 ________部件
POTENTIAL FAILURE MODE AND EFFECTS ANALYSIS (Design FMEA) 潜在失效模式及后果分析(设计 设计FMEA) 潜在失效模式及后果分析 设计
設計失效模式及效應分析 Design Failure Mode Effect Analysis (DFMEA)
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DFMEA设计失效模式及效应分析 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/小组采用的分析技术 to identify potential failure modes 用作辨别潜在失效模式 to identify associated cause/mechanisms 辨别相关原因/机理 to support the design process in reducing the risk of failures 支持设计过程, 减少失效风险 apply to system, subsystem, and component 应用于系统、 子系统及部件
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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行生产 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 weakness DFMEA不依靠过程控制来克服潜在的设计缺憾 DFMEA considers technical limits of manufacturing DFMEA考虑制造的限制