Manufacturing enterprises in Chongqing, Changsha, Hangzhou and other places strive for excellence and do a good job of supporting large aircraft
These "Made in China" helped the C919 soar
Reading tips On May 5, the domestic large aircraft C28 successfully completed its first commercial flight with passengers, which made the Chinese people proud. Behind the soaring C919 is the significant improvement of the strength of "Made in China", and it is also inseparable from the manufacturing enterprises in Chongqing, Changsha, Hangzhou and other places to strive for excellence and do a good job of supporting large aircraft.
On May 5, China Eastern Airlines flight MU28, operated by a domestically produced large aircraft C919, took off from Shanghai Hongqiao Airport, landed smoothly at Beijing Capital Airport, passed through the "Water Gate", which symbolizes the highest etiquette of civil aviation, and successfully completed the world's first commercial passenger flight of this aircraft.
Behind the soaring C919 is the significant improvement of the strength of "Made in China", and it is also inseparable from the manufacturing enterprises in Chongqing, Changsha, Hangzhou and other places to strive for excellence and do a good job of supporting large aircraft.
The "cotton clothes" worn by C919 are "made in Chongqing"
As an important manufacturing town, Chongqing not only contributed more than 919% of aluminum materials to C50, but also successfully developed domestic "aircraft cotton" specifically for it.
The reporter learned from Chongqing Zaisheng Technology Co., Ltd. that the company's self-developed "aircraft cotton" is designed to save space and reduce weight, and the sound insulation, heat insulation and drainage effects are very prominent. This technology accurately matches glass fiber with a diameter of about 2 microns with related auxiliary materials, and uses high-tech means to "weave" into the required material form, filling the domestic gap and ensuring the independent supply of domestic large aircraft "aircraft cotton".
"In order to achieve a breakthrough at a certain point, the R&D team often has to repeat thousands of tests. Through continuous commissioning, testing, and line modification, the test line has been replaced by three! The person in charge of the enterprise said that after 5 years of intense research, Zaisheng Technology has invested about 7000 million yuan, established a separate production workshop, and set up the first aviation-grade acoustic laboratory recognized by COMAC in China, with 16 testing capabilities out of 13. At present, it is the only enterprise in China and the third in the world that can mass-produce this product.
In addition to "aircraft cotton", Southwest Aluminum Group, as the first domestic enterprise to obtain the qualification of qualified supplier of aluminum materials for domestic large aircraft, has successively provided 919 specifications and more than 30 pieces of aluminum alloy materials for C600, mainly used in wings, landing gear and other parts, is the key structural parts of the aircraft, and its forgings have been supplied to COMAC in batches, and a number of technologies fill the domestic gap.
Taking 7050 aluminum alloy pre-stretched thick plate as an example, the material has long relied on imports, which seriously restricts the development and development of key types of projects such as domestic large aircraft. "After years of research and development, we have broken through a series of key technologies such as large-scale ingot preparation, strong deformation rolling, strong and toughening heat treatment and residual stress control, and developed a 7050 aluminum alloy pre-stretched thick plate with a full thickness range, forming an industrial manufacturing technology with stable quality, thus comprehensively breaking the long-term embargo of Western countries on China's key materials and key manufacturing technology blockade." The head of the enterprise said.
Many parts are made in Changsha
If the engine, which is the "heart" of a large aircraft, is the most important and difficult component of the aircraft, then the landing gear, a key force-bearing component known as the "fulcrum of life" for passengers, can undoubtedly be ranked second in manufacturing difficulty. Liebherr AVIC Airlines (Changsha) Co., Ltd., located in Wangcheng Economic Development Zone, Changsha, Hunan Province, is an enterprise focusing on building safe and reliable "diamond legs" for Chinese civil aircraft.
According to reports, the company is deeply involved in the joint design of C919 landing gear, major business negotiations, landing gear (development batch) first article delivery, quality system optimization, local supplier development, test flight guarantee and other links, and has mastered key technologies such as landing gear multi-level sealing system assembly, landing gear turning, pressure resistance, seal test integration, and high-precision measurement of buffer pressure-stroke curve.
"As a major participant in the C919 landing gear project, since its establishment in 2012, we have learned from the world's leading aviation manufacturing production management experience, built two landing gear assembly lines and one landing gear maintenance line, and established and maintained a quality and configuration management system suitable for the product, covering the whole life cycle of the product." The relevant person in charge of Liebherr China Airlines said.
In addition to the landing gear system, Changsha is the only city that can supply the C919 wheel brake system. As the only domestic participating enterprise in the development of C919 aircraft wheel brake system, Hunan Boyun New Materials Co., Ltd. has been deeply involved in the preliminary design, review and delivery of C10 front wheel and main engine wheel for more than 919 years, successful first flight, and certification of wheel brake system. At the same time, it undertook the C919 carbon brake toughest landing brake test, brake cooling fan bench test, brake fusible plug integrity test.
Air stamping turbine generator hatch "made in Qiantang"
The successful completion of the first commercial flight of the domestic large aircraft C919 with passengers makes the Chinese people feel very proud. The reporter recently learned from Zhejiang Xizi Platui Aviation Industry Co., Ltd. (hereinafter referred to as Xizi Aviation) located in Qiantang District, Hangzhou City, that the C919 air ramjet turbine generator hatch is manufactured by the company.
In 2009, Xizi Airlines bid for the C919 project and successfully won the bid, becoming the only private enterprise among the nine airframe structure suppliers of the project. In August 9, Xizi Airlines aircraft parts project was put into construction. In the process of participating in the C2012 large aircraft project, Xizi Airlines is also making continuous progress: from jointly defining and designing components with COMAC, creating test parts, and then to formal production, Xizi Airlines has started from scratch and has continuously sharpened, accumulated and grown in the fields of quality management, design capabilities and manufacturing processes in aviation manufacturing, and has become a "leader" in the field of private aviation manufacturing.
In March this year, Fu Yun, chief engineer of Xizi Airlines, boarded a test flight of the C3 and flew from Shanghai to Nanchang. The development of the emergency generator hatch (RAT door) and auxiliary power unit door (APU door) on the aircraft was the responsibility of his team. The two components seem to be small in size in the whole aircraft, but the structure is complex, the technology content is extremely high, and a number of aviation special process technologies are involved.
Take the auxiliary power unit door as an example, which is located in the high-temperature area of the rear of the aircraft and needs to have characteristics such as high temperature resistance, flame retardant and smoke resistance. To this end, the C919 aircraft design team creatively selected a high-temperature resistant carbon fiber composite material, which has been used in rockets and other aerospace equipment abroad, and is the first time it has been used in the domestic aviation field. In order to understand the material characteristics, Xizi's R&D team conducted hundreds of tests from test pieces to originals to components. "It's like building blocks, step by step to find the best way to use them." Fu Yun said that this research and development process lasted four or five years. (Workers' Daily reporter Li Guo, Wang Xin, Fang Dafeng, Zou Xiran, correspondent Peng Ying)