Recently, 31 countries and the Northwestern Polytechnical University jointly undertaken a national 3D printing manufacturing technology promotion application project - "laser selection melting forming technology" (that is, a 3D printing technology applied to a turbo pump), successfully passed the scene Test acceptance.
Based on the development of a new aerospace engine turbopump, the project carried out 3D printing technology engineering application research on the core part oil-cooled turbine blade shaft rotor, breaking through the key design of the integrated cooling structure of the coiled blade and the laser selective melting of the rotor parts. The technology has liberated the traditional technology to the structural design constraints, realized the complex and narrow inner channel rotor structure design and manufacture, the structure of the heat transfer cooling effect increased by 90%, effectively solved the turbo pump high temperature thermal protection technology problems, the product passed smoothly High temperature test. This project has realized the application of 3D printing technology on rotor parts for the first time in China. The research results have also been applied to the development of other key components of aerospace engines, breaking through complex shaped thin-walled bearing housings, hollow thin-wall active cooling nozzles and The bottleneck of the manufacturing technology of products such as slender and thin-walled internal flow nozzles, which realizes the rapid manufacture of key structures of the engine, significantly improves the comprehensive performance of the aerospace engine.
In 2014, the project was successfully screened in 3D printing promotion applications, and it was the only project in the aerospace engine field. After nearly two years of hard work, the project team became the first project in the thematic field to successfully pass the acceptance test.
For a long time, the manufacture of key components and the manufacture of high-end mechanical equipment have been monopolized by foreign countries. The implementation of the “Made in China 2025†plan has accelerated the pace of building a strong manufacturing country in China. 3D printing technology has the characteristics of high flexibility, fast response, low correlation between manufacturing cost and product complexity, and wide application materials. It has broad application prospects in the aerospace high-end manufacturing field. As the main research unit of China's aerospace engine, 31 has been committed to the exploration and research of cutting-edge manufacturing technology. In order to further promote the application of 3D printing technology in aerospace manufacturing, give full play to the new technology to model the development of the model, 31 will be innovative design concepts, carry out research on integrated structural design technology based on 3D printing manufacturing; enhance manufacturing process, focus on development Titanium alloy, high-temperature alloy material complex structure integrated high-efficiency forming technology; establish quality system, form 3D printing forming manufacturing process and quality control standards.
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