Depth: Why are aero engine blades so hard to make?

The local gold of the "China Heart" Taihang engine at the air show was still quite eye-catching; when it changed color, it suddenly got taller! The development of Taihang engine began in the late 1980s and completed the design review and assessment on December 28, 2005, which lasted 18 years. The Taihang engine is China's first high-performance, high-thrust, afterburning turbofan engine with independent intellectual property rights. It has ended the gap in the domestic advanced turbofan engine.
The only countries that can develop the third generation of large thrust turbofan engines are the United States, Russia and China. The successful development and publicity of the Taihang engine proves to the world the overall strength and technical level of the Chinese aviation power industry. It also means that China can achieve independence in the major dynamic areas related to the national economy and people's livelihood.
The aero engine is hailed as "the pearl of the industrial crown." The blade occupies a very important position in the aero engine, which is the most important in the manufacture of aero-engines, accounting for about 40% of the workload; it is also a difficult point in the manufacture of aero-engines, and the manufacturing requirements and technical precision are very high. It reflects the level of engine manufacturing technology and greatly affects the overall performance of the engine. In addition, the blade body during the high-speed rotation of the blade is subjected to a very large load. In order to reduce the probability of damage, the material properties, structural strength and surface quality of the blade are very demanding. In addition to the extremely high load, the blades at the hot end part have to withstand the influence of high temperature at high speed, and place extremely high demands on the material and processing technology of the blade.
Why are the blades so hard to make? See the details in the above picture. In order to adapt to the high temperature environment inside the engine, the blades are cooled, each blade is precision cast, the inner hollow, and the inner cavity structure is extremely complicated. Whether it is processing or design, it is a huge challenge! !

After several decades of development, China's aero-engine blades have formed a relatively complete system, which basically meets the needs of China's advanced aero-engine development; in some new materials (such as directional solidification superalloys, single-crystal superalloys, intermetallic compounds) The development and processing of high-temperature alloys, etc., has gradually kept pace with the world's advanced level.
At present, the development of China's aero-engine blade processing technology faces both valuable opportunities and enormous challenges. To clarify the properties of different blade materials and the intrinsic characteristics of their processing technology, master the technical connotation of blade processing from the theoretical essence and engineering technology, which is the key to master the advanced processing technology of aero-engine blades. China Aviation needs to vigorously promote the basic theory of blade processing technology and the construction of key technology research systems around important issues such as new materials and new processes. This will greatly promote the leapfrog development of advanced processing technologies for aircraft engines in China.

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