【摘要】 产品投入服役使用后,由于产品的不断受循环负载作用、老化等原因,产品望大质量特性值会不断变化而超出技术规范要求,从而导致产品丧失功能而报废造成损失。本文定义产品质量损失为产品投入服役后因产品质量特性值超出规定范围而导致报废所造成损失现值,应用资金折现原理建立了基于服役寿命分布的产品望大特性的质量损失模型,并提出了基于望大质量特性技术规范要求的产品服役寿命分布密度函数计算方法。以转轴危险截面的疲劳强度为例,深入讨论了新质量损失模型中各参数对转轴疲劳强度质量损失的影响,并与田口望大特性质量损失模型进行了比较分析,结果表明:新质量损失模型描述了产品投入服役后给社会带来的实际损失,能够反映望大质量特性在产品服役过程中产生的质量损失,这比田口质量损失模型更符合实际。新质量损失模型将产品望大质量特性的容差设计从产品设计制造阶段扩展到产品服役阶段。更多还原

【Abstract】 The product LTB quality characteristics are continually changing and out of specification limits because of cyclic load and aging after the product is put into use,which will cause loss because of the product rejected and scrapped.On the basis of the view on quality that product quality losses are present worth of a loss caused by product obsolescence because its quality characteristics are out of specification after it’s put into service,the paper establishes the present worth of quality losses model about LTB characteristics based on service life distribution with the principle of discounted cash flow,and proposes the calculation method of product service life distribution density function based on the technical specifications of LTB quality characteristic.It takes the fatigue strength in the dangerous cross-section of rotation shaft as an example to analysis the impact of various factors of the new model on the present worth of fatigue strength quality losses,and contrast with Taguchi quality loss model.The results show that the new model describes an actual loss that a product imparts to society after the product is put into service,and can reflect quality loss of LTB quality characteristics in the product service process,and is more realistic than Taguchi quality loss model.The new model extends tolerance design of LTB quality characteristics from the manufacturing stage to the service stage.更多还原