Product manufacturing reliability degradation root cause identification method based on QFD decomposition and extended RPN value

Abstract

The invention provides a product manufacturing reliability degradation root cause identification method based on QFD decomposition and RPN value expansion. The method comprises the following specific steps: 1, determining and decomposing product key reliability characteristics; 2, extracting part characteristics of the product; 3, mapping and decomposing the product part characteristics to a production line; 4, acquiring process unit characteristics on the production line and removing redundant characteristics; 5, calculating the importance of the characteristic to the reliability characteristic of the product as a first risk factor; 6, calculating a characteristic deviation probability as a second risk factor; 7, calculating the undetectable degree of characteristic deviation under the current control condition, and taking the undetectable degree as a third risk factor; and 8, calculating a characteristic integration RPN value so as to determine a root cause of product manufacturing reliability degradation. According to the method, the defect that the interaction mechanism of the manufacturing process and the product reliability is ignored in a traditional method is overcome, and the method has important reference value for guiding targeted and emphasized control of the production process.

Description

technical field [0001] The invention provides a method for identifying the root cause of product manufacturing reliability degradation based on QFD decomposition and extended RPN value, belonging to the field of reliability. Background technique [0002] With the rapid development of various industries and the impact of economic globalization on the national economy, the level of manufacturing has become an important indicator of a country's comprehensive national strength and an important manifestation of its international competitiveness. With the advent of the era of intelligence and big data, my country's manufacturing industry has achieved unprecedented development, and its development has promoted the production of a series of products with complex structures and integrated functions. However, uncertain factors such as changing production environments and complex manufacturing processes emerge in an endless stream. The manufacturing process needs to ensure the reliabil...

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Problems solved by technology

[0006] In order to solve the problem of identifying the characteristics that affect product reliability in the manufacturing process in the existing research, which cannot be directly developed with the product as the core, the present invention provides a systematic identification method for the root cause of product manufacturing reliability degradation—a method based on QFD decomposition Root cause identification method of product manufacturing reliability degradation with extended RPN value

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