《[精选]DFMEA(PPT47页)》由会员分享，可在线阅读，更多相关《[精选]DFMEA(PPT47页)（48页珍藏版）》请在金锄头文库上搜索。
1、1,設計失效模式及效应分析Design Failure Mode 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 recommen
2、ded functions.,8,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 r
3、educing 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,9,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,10,Team Effort 小组的努力,Design 设计 Manufacturing 制造 Quality 品质
4、 Material 材料 Reliability 可靠性 Sub-contractor 分供方,11,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
5、drawing release在产品加工图样完工之前全部完成,12,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 weaknessDFMEA不依靠过程控制来克服潜在的设计缺憾 D
6、FMEA 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 / 过程能力,13,Development of a Design FMEA 设计FMEA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 t
7、o do” “列出设计期望做什么和不期望做什么?,14,Development of a Design FMEA设计FMEA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”,15,Block Diagram 框图,DFMEA Recommended tool : Block Diagram DFMEA建议工具 : 框图,Snap fit 卡扣连接,滑动配合,16,1,2,3,4,5,6,7,8,9,10,
8、11,12,13,14,15,16,16,17,18,19,20,21,22,_ System _ Subsystem,POTENTIAL FAILURE MODE AND EFFECTS ANALYSIS(Design FMEA),FMEA Number_,Core Team_,17,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,16,17,18,19,20,21,22,_ 系统 _ 子系统,POTENTIAL FAILURE MODE AND EFFECTS ANALYSIS(Design FMEA) 潜在失效模式及后果分析(设计FMEA),FMEA 编号_
9、,核心小组_,功能,18,Details of DFMEADFMEA的詳細內容,19,Design Objectives: Minimum 3000 hours of riding without need for maintenance and 10,000 hours of riding for design life. Accommodates maleadults comfortably to the 99.5th percentile ect Function: Ease of use Potential Failure Mode(s): Difficult to steer Dif
10、ficult to pedal Function: Provide reliable transportation Potential Failure Mode(s) : Chain breaks frequently Tires require frequent maintenance Function : Provide comfortable transportation Potential Failure Mode(s) Seating position is not comfortable,Function: Provides stable attachment for seat s
11、upport 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,Handle Bar Assembly,Rear Wheel Assemble,Sprocket Assemble,Function: Provides structural suppo
12、rt 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 metho
13、ds (welding) Potential Failure Mode(s):,Bicycle,Frame,Front Wheel Assemble,Seat Assemble,Chain Assemble,Upper Frame,Lower front Tube,Lower Rear Tube,Sprocket Tube,System Level,Subsystem Level,Component Level,20,设计目标 : 骑行至少3000小时无需保养, 设计寿命为骑行10000小时。 适于第99.5百分位成年男子 骑用, 舒适便利。 3.等等. 功能: 便于使用 潜在失效模式: 方向
14、把不好用 脚踏板不好用 功能: 提供可靠的交通运输 潜在失效模式: 链条经常断开 需要经常修理车胎 功能: 提供舒适的交通运输 潜在失效模式: 车座位置不舒服,功能: 为座位支撑提供稳定的附属物 潜在失效模式: 座位支撑的结构性失效 座位支撑的过大变形 功能: 提供好看的外观 潜在失效模式: 外观(光亮度)变坏 漆皮开裂,把手总成,后轮总成,链轮总成,功能: 提供结构性支撑 潜在失效模式: 结构性失效 过大变形 功能: 对正确的车架几何外形提供 尺寸控制 潜在失效模式: 车架安装点的长度过长 车架安装点的长度过短 功能: 为车架总成的生产方法(焊接) 提供支持 潜在失效模式:,自行车,车架,前
15、轮总成,车座总成,链条总成,上部车架,下前车管,下后车管,链轮管,系统等级,子系统等级,部件等级,21,Details of DFMEA,22,Details of DFMEADFMEA的详细内容,23,Details of DFMEADFMEA的详细内容,24,Details of DFMEADFMEA的详细内容,25,Details of DFMEADFMEA的详细内容,26,Details of DFMEADFMEA的详细内容,27,28,29,Details of DFMEA,30,Details of DFMEADFMEA的详细内容,31,Details of DFMEADFMEA的
16、详细内容,32,Details of DFMEADFMEA的详细内容,33,Details of DFMEA,34,35,Details of DFMEADFMEA的详细内容,36,Detail of DFMEADFMEA的详细內容,Shall consider two types of design controls要考虑两种 类型的设计控制： Prevention:Prevent the cause/mechanism of 预防： failure OR the failure mode from occurring, or reduce their rate of occurrence. 防止失效的起因/机理或失效模式出现，或者降低其出现的几率。,37,Detail of DFMEADFMEA的详细内容,Detection:Detect the cause/mechanism of 探测： failure OR the failure mode, either by analytical or physical methods, before the item is releas
