In 1956, the first jet fighter made in China successfully flew into the sky in Shenyang, northeast China, and realized the Chinese dream. In the late 1980s, with the deepening of reform and opening up and the development of economic construction, the Central Military Commission decided to concentrate on developing air force equipment according to the characteristics of modern warfare, introduce some advanced foreign aircraft and advanced technology, and absorb and absorb new technologies as soon as possible and accelerate. The process of localization.
The development of China's third-generation heavy-duty fighter plane is an extremely complex system engineering with multiple fields and high-tech. It is necessary to carry out multiple optimization design of the aircraft platform, and independently develop and develop an integrated avionics system that meets the international advanced three-generation machine level. And complete the installation test of the new engine, it takes 8 to 10 years to complete the routine in 5 or 6 years. The difficulty and risk are conceivable. In order to reduce the risk of development, ensure the progress of the project development, the model chief designer system is reasonably arranged, and made a number of major deployments to reduce the development risk and shorten the development cycle, achieving a high degree of parallel between the design and production process.
The third generation machine is the most different in manufacturing technology from the structure of aircraft parts produced in the past. It is widely used in titanium alloy materials. For example, the amount of titanium alloy such as the central wing of the aircraft, the tail trimmer, and the engine protective barrier is 15% of the weight of the whole machine. The welding process of submerged arc welding, penetration welding and double arc welding which are necessary for titanium alloy is a brand new manufacturing field. Shen Fei and Yihang Materials Institute and Yihang Manufacturing Co., Ltd. formed a joint research team to overcome this difficulty. After repeated trials, only the test materials reached more than 800 kilograms. For example, the weld seam of the lower wall of the fuel tank is up to 47 meters. At present, the skilled workers have been able to operate freely and weld a flat and good weld. The mastering of the welding technology of titanium alloy parts has opened up the production line of the third-generation machine, and has achieved important scientific research results, filling a number of domestic blanks. In the first time in China, they carried out experimental research on various welding methods for titanium alloy materials commonly used in airplanes, and obtained detailed experimental results. Firstly, the experimental quality of the important bearing members of aircraft titanium alloys was systematically studied and optimized. Welding process, obtaining high-quality welded joints; for the first time, welding residual stress and residual deformation of titanium alloy materials for aircraft, static low stress and no deformation method welding; first completed the qualified welding of titanium alloy installed parts of three generation aircraft aircraft, to solve this The process problem provides an important process basis; it provides a scientific basis for the design and welding of titanium alloy important bearing members on the third generation machine.
Titanium alloy chemical milling is a special processing method without tool marks, no cutting force and no coordination of parts. The precision requirements are quite high. At that time, there were no relevant technical data parameters for reference in China, and this technology is still blank in China. However, titanium milling accounts for a large proportion of the third-generation fighter parts processing, and its position is very important. Its technical mastery and application level directly affect the progress and quality of the third-generation machine development.
Reform and opening up have made it possible for China to introduce advanced heavy fighters, from digesting advanced technologies to independent design innovations, from difficult start to successful first flight, from designing stereotypes to batching of equipment, cadres and workers of the aviation industry are painstakingly struggling for it. They bravely challenged a number of national-level technical problems, successfully completed the glorious task of the development of the third-generation aircraft, and achieved major scientific research results of independent innovation, and delivered satisfactory answers to the party and the people.
Data map: China's latest æ¼11B fighter aircraft in the factory building
Data map: domestic æ¼11B fighter rear view close-up
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