DFMEA------失效模式与后果分析.pptx

dfmea-失效模式与后果分析 (design failure mode or to the next process, the user and the influence of the equipment; or to end customers, government regulations, safety, and environmental protection, and a default. 四、dfmea 关键参数 dfmea key parameter 严重度severity 严重度的划分标准-主观判定 severity classification standard-subjectivity decide 其大小由失效模式的影响程度而定，以1至10表示等级. its size of the failure mode of the influence degree to decide, be 1 to 10 show level. 1级最轻微，10级最严重. 1level best slight , 10 level best grave. 1级-几乎不会有什么影响. 1level-almost has no influence. 10级-违反安全和法规. 10level-violation of safety and regulations. 四、dfmea 关键参数 dfmea key parameter 严重度分类severity classify 耐火性、自然性、ul 、rhos design products company process was unable to complete; customer unique accessories compatibility problem; cant 95 to % above probability reproduction; computer monitoring function failure or big error. 7 客户关注的重点功能性问题或者是产品主推场所应用的兼容性问题；产品量化参数 不达标. customer focus of concern functional problems or is the product of the main place the application compatibility problem; product quantitative parameters not standard. 四、dfmea 关键参数 dfmea key parameter 严重度等级标准severity rank standard 等级/评分 rank 划分标准 divide standard 8 基本功能失效，失效影响计算机数据处理功能. the basic function failure and influence the computer data processing function. 9 影响产品安全运行或者包含不符合法律、法规；产品执行标准影响人身安全；产品失 效时有警告. influence the safe operation of the product or contain does not comply with the laws, rules and regulations. product standards affect personal safety; product failure is warning. 10 影响产品安全运行或者包含不符合法律、法规；产品执行标准影响人身安全；产品失 效时无警告. influence the safe operation of the product or contain does not comply with the laws, rules and regulations. product standards affect personal safety; product failure isnt warning. 四、dfmea 关键参数 dfmea key parameter 发生率occurrence 某一原因而导致失效发生的几率. a reason to the odds of failure. 划分标准：依据不良品出现的机率来定，以1至10表示等级. the division standard: according to the probability of bad product appeared to decide, be 1 to 10 show level. 1级最轻微，10级最严重. 1level best slight , 10 level best grave. 1级-几乎不会发生. 1level- almost wont happen. 10级-肯定会发生. 10level- will happen 四、dfmea 关键参数 dfmea key parameter 发生率occurrence 划分标准-cpk、主观判定、统计资料 divide standard-cpk, subjective judge, statistical information 划分标准 divide standard 等级/评分rank描述describe发生率occurrencecpk 1(remote) 几乎不可能发生almost wont happen. 1/1500k1.67 2(very low)有轻度发生的可能with mild possible1/150k1.50 3(low)有可能发生possible1/15k1.33 4(moderate) 偶尔发生，但不占有大的比例occasionally occur, but dont have great proportion 1/2k1.17 5(moderate)1/400pcs1.00 6(moderate)1/80pcs0.83 四、dfmea 关键参数 dfmea key parameter 发生率occurrence 划分标准-cpk、主观判定、统计资料 divide standard-cpk, subjective judge, statistical information 划分标准 divide standard 等级/评分rank描述describe发生率occurrencecpk 7(high) 经常发生often occur 1/20pcs0.67 8(high)1/8pcs0.51 9(very high) 几乎不可避勉almost do not avoid layer 1/3pcs0.33 10(very high)1/2pcs0.33 四、dfmea 关键参数 dfmea key parameter 难检度detection 在现行的控制措施下，侦测失效发生的能力. in the current control measures, the ability to detect failure happened. 划分标准：依据失效模式检验的难易程度来定，以1至10表示等级. the division standard: according to the failure mode of the test difficulty to set, be 1 to 10 show level. 1级最容易，10级为几乎不可能发现. 1level best easy , 10 level for almost impossibility find. 1级-用有效的手段完全可以检测出来 1level-with effective means completely can be detected. 10级-无任何手段可以检测出来. 10level-no means can be detected. 四、dfmea 关键参数 dfmea key parameter 难检度detection 划分标准-主观判定、统计资料 divide standard-subjective judge, statistical information 划分标准 divide standard 等级/评分rank描述describe可侦度detection 12几乎可以肯定地检测 出来almost certainly detected99.99% 35有良好的手段可以检测 出来have good means can be detected99.80% 68可能能检测 出来might be able to test out98.00% 9有可能检测 不出may cannot be detected90.00% 10很有可能检测 不出来very likely test does not come out90.00% 四、dfmea 关键参数 dfmea key parameter 风险系数risk priority number rpn=s*o*d 风险系数rpn排出次序后，rpn越大越优先解决.rpn在100以上必须解 决；50rpn100应尽可能解决，不能解决必须加严控制；rpn50可不 加控制.当严重度(s)很高或发生率(o)很高时，不管rpn大小如何，都必 制定相应改善或控制措施，并指定责任人和改善完成日期. risk coefficient rpn discharge order, the bigger the rpn priority. rpn in more than 100 must be solved; 50 rpn 100 should as far as possible to solve, cant solve must be tightened control; rpn 50 dont add control. when the severity (s) or high incidence (o) is very high, no matter how rpn size will be formulate the corresponding improvement or control measures, and appoint responsible persons and improve the completion date. 如何制定改善措施 how to make the improvement measures 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； aiming at preventing/corrective measures, in order to reduce the content of the evaluation grade order: (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； through the design change to eliminate or control one or more of the cause of the failure mode mechanism, can reduce the severity level; 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. through the change of the design, remove or control one or more of the cause of the failure mode effect or equipment, can reduce the incidence of grade. 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. to increase the design verification, modifying the test plan, modify the original material specifications, can only reduce the difficult degree of test. 五、dfmea 表单填写说明1 dfmea notes on completing the form(1) dfmea 编号：填入dfmea文件的编号，以便要询； dfmea numbers: fill in the dfmea file numbers, so that to information; 项目：填入所分析的系统、子系统或零件的过程名称，编号； project: fill in the analysis of the system, subsystem or parts of the process name, numbers; 设计责任：部门、小组还应包括供方的名称； design responsibility: department, the team also should include the name of the supplier; 填入负责dfmea 工作的工程师姓名、电话及所在公司名称； fill in the responsible of the engineers dfmea name, phone number and the name of the company; 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； fill in will use or are being analyzed the influence of the design process of the expected type and material number; 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. the key date: fill in the dfmea first target completion date, this date shall not exceed the design plan to begin production release date. 五、dfmea 表单填写说明2 dfmea notes on completing the form(2) dfmea 日期：填入编制dfmea原始稿的日期及最新修订日期； dfmea date: fill in the draw up dfmea date and latest revision date. 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”. the core team: list shall have the right to determine and implement the responsibility of the department and individual task name, if for a particular reason no suggested measures, then write in the column of “n/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: fill in the name of the project are analyzed and numbers, if the project has a variety of functions, and have different failure mode, we should put all functions are listed separately. 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. potential failure mode: for a specific project and its function, the application of standardized, professional terms to list each potential failure mode provided that failure may occur, but does not necessarily occur. 五、dfmea 表单填写说明3 dfmea notes on completing the form(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； potential failure consequences, is the failure mode of the influence of the system function, it is to see the customers in the use of the situation. 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 (important program) for parts, system, subsystem product characteristics classification : the key, 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. the cause of the potential failure/mechanism: the cause of the potential failure modes is to point to a design or process underbelly signs; mechanism of what causes the failure. 五、dfmea 表单填写说明4 dfmea notes on completing the form(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； occurrence is to point to a specific failure cause or mechanism (already listed in front bar) 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. the current design, process control, the control method refers to those who have used or are used in the same or similar design of those methods. 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”. suggesti