Under the current production mode of multiple varieties and small batches, the traditional post-event quality assessment method is still used in the manufacture of rocket body structure in China. In order to solve the problem that this method can not fully reflect the quality of each step in each process, a quality assessment method for rocket body structure based on product quality DNA is proposed in this paper, which converts the assessment of product quality into the analysis of product quality DNA. This method comprehensively assesses the quality of each process and each step in each process by searching the assessment knowledge base based on product quality DNA. Based on the principle of biological DNA, this paper combines the idea of product gene with product quality, and constructs a model of product quality DNA from three structural levels(basic structure, double helix structure and superhelix structure). This paper takes a weld of a rocket body structure as an example and assesses the quality of this weld by using the quality assessment method for rocket body structure based on product quality DNA. The results show that the quality of the weld is assessed as “good”.

Aiming at the problem that the manufacturing process of our aerospace products is relatively discrete and the lack of appropriate quality monitoring and feedback mechanism, a method of coding for aerospace product quality DNA was proposed. Based on the structure of biological DNA and the theory of quality assessment, equipment diagnosis and quality traceability, the biological DNA structure was transformed into the structure of aerospace product quality DNA, and the concept of aerospace product quality DNA was defined, including the genetic and variation characteristics of aerospace product quality DNA. The coding rules of aerospace product quality DNA were designed, and the designed encoding rules are applied to the case of welding of wall panels in the manufacturing process of aerospace products. The results show that the coding method can monitor and feedback the core information related to quality in the manufacturing process of aerospace products.

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