China's breakthrough in ultra-fine "cold processing" technology for aircraft engine blades

March 05, 2021

Abstract Recently, a press conference was held by the Chinese Academy of Sciences. At the meeting, the Xi'an Institute of Optics and Fine Mechanics of the Chinese Academy of Sciences developed the 26-watt industrial-grade femtosecond fiber laser with the highest single-pulse energy in China, and developed a series of ultra-fast laser extreme manufacturing equipment to realize the aviation engine...

Recently, a press conference was held by the Chinese Academy of Sciences. At the meeting, the Xi'an Institute of Optics and Fine Mechanics of the Chinese Academy of Sciences developed the 26-watt industrial-grade femtosecond fiber laser with the highest single-pulse energy in China, and developed a series of ultra-fast laser extreme manufacturing equipment to realize the aero-engine turbine blade air film hole. The breakthrough of “cold processing” has filled the domestic gap and reached the international advanced level.

This is undoubtedly a major breakthrough! In the aviation field, aero-engines have long been hailed as "the jewel in the crown of modern industry", and its manufacturing level represents a country's technological, industrial and defense capabilities. The engine blade is the first key component of the aero engine. It is the highest temperature, most complex stress and the worst environment in the aero engine. Its casting process directly determines the performance of the aero engine.

Previously, due to the large gap between China's aircraft engine manufacturing technology and developed countries in the West, the turbine blades of the engine were difficult to withstand higher temperatures, resulting in a serious shortage of engine thrust. now. The emergence of "cold processing" ultrafast laser extreme manufacturing technology has greatly complemented the short board and enhanced the performance, life and reliability of the aerospace engine.

According to the researcher of the institute, the use of ultra-fast laser micromachining technology to perforate the surface of the blade, the formation of the film cooling hole can effectively solve the problem of cooling the aircraft under ultra-high temperature (1700 ° C) and ultra-high pressure conditions, and The ultra-fast laser micromachining technology also breaks through the defects of recasting layer, microcracking and recrystallization in the film hole of the traditional manufacturing method.

To put it simply, this technique is similar to laser surgery performed by myopic patients, so that it can be focused on a space that is thinner than the hair, so that the cut surface is neat, no heat diffusion, no microcracks, and no The technology has become an excellent choice for ultra-fine and low-damage areas in aerospace, electronics and other fields.

It is worth mentioning that this technological breakthrough can not only be used in the high-end aerospace field, but we will also see the application of this technology in future life, such as automobile engines. According to experts, the core indicators of this technology have been level with the international advanced level, and can provide a comprehensive solution for the ultra-fine and "cold processing" of many difficult materials and components.

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