基于工艺失效知识的工艺改进方法及实现

Approach to process improvement based on process failure knowledge and its implementation

工艺设计是一个不断改进与优化的过程,而反面工艺知识即工艺失效知识,对工艺改进与优化往往十分有效.提出了一种基于工艺失效知识的改进方法,包括8个步骤确定潜在失效模式,分析潜在失效原因,计算风险优先数N,提出改进措施,计算改进后的风险优先数N’,权衡改进措施,采纳改进措施和存储工艺改进数据.在基于Web的工艺失效知识库管理系统——工艺FMEA(FailureModeandEffectAnalysis)的基础上,通过建立工艺失效知识与产品和工艺信息的关联,实现工艺FMEA系统与CAPP(ComputerAidedProcessPlanning)系统的信息集成和过程集成,从而达到工艺改进的目的.给出某飞机结构件(主梁)利用工艺失效知识进行工艺改进的验证实例,为在工艺设计阶段主动预防地改进工艺方案提供了一种有效手段.

Process planning is a continued improving and optimizing process, and reverse process knowledge, namely process failure knowledge which is experience of process improving measures where process quality problems occur in production, is quite effective to improve and optimize process solution. A process improvement approach based on process failure knowledge was proposed, it includes eight steps： identifying potential failure mode, analyz- ing potential failure cause, counting risk priority number N, proposing improvement action, counting risk priority number N＇ after improvement, tradeoff improvement action, accepting improvement action and saving process improvement data. On the basis of Web-based process failure knowledge management system （process FMEA, failure mode and effect analysis）, the relationships between process failure knowledge and product and process information was established so as to implement the information and process integration between process FMEA and CAPP（com- puter aided process planning）, and achieve effective process improvement. An airplane structural part（ main girder） was used to validate process improvement utilizing process failure knowledge. This approach provides an effective measure to actively other than passively improve process solution during process planning.