DFMEA设计潜在失效分析培训教学PPT课件.ppt

* 46 * 47 * 48 * 49 * 53 * 57 In the normal course of design, an engineer usually: runs some tests, performs some analysis ...to verify and validate the design. * 58 * 59 * 61 * 62 * * 67 Higher RPN = greater potential for problems. A high RPN indicates the effect of the failure is severe, or the cause of failure is likely, or the design controls dont tell us much about real life failure. * 70 * 71 Some Tools: TRIZ inventive problem solving methodology -- improves conceptual design Taguchi methods -- improves robustness of design DFM -- simplifies products, thereby reducing the likelihood of failure Overstress Probe Testing (Shainin) -- determines the likely cause of failure via DOE. * 72 * 73 * 74 * * 5 * 5 * 6 * 7 * * * 10 * 5 * 11 * 12 * 5 * 13 * 14 * * 16 * 5 * 17 * 18 * 19 * 20 * 21 * 22 * 23 * 24 * 25 * 26 * 28 * 34 * 35 * 36 * 40 * 41 * In your own descriptive words, write down the following scenarios，描述下列情况： failure = no function， 失效 = 无功能 failure = not enough function， 失效 = 功能不足 failure = too much function， 失效 = 功能过强 similarly,同样： failure = no quality requirement 失效 = 未达到质量要求 5. Hint提示 * 6. Derive the potential effects of each failure 各种失效模式的潜在后果 The ramifications of failure，失效的结果 Effects can be on，有可能影响到 an ultimate or intermediate customer，最终或中间顾客 a government regulation，政府法规 some part of the system hierarchy，系统结构的某一部分 Customer complaints are a useful source of information 顾客的投诉是有用的信息来源 * 6. Effects of Failure失效的后果 An effect can be ，后果可能是： complete loss of function，功能完全丧失 degradation of performance or quality 性能或质量下降 Many failure modes have more than one effect! 许多失效模式有不止一种后果！ Hint: begin with the “No function”scenarios that you developed earlier 提示：始于你在上面所提到的“无功能”情况 * Effects of failure often show up as a chain of events, from immediate effect to the ultimate effect on the customer，失效的后果通常表现为从对顾客的直接影响到最终影响等一系列连锁反应 It is recommended that these chains be developed for each failure mode and recorded on the