The Development And Application Of Fasteners in The Aerospace Field.

Fasteners are a kind of mechanical parts used for fastening connections and widely used. Aerospace fasteners refer to the fasteners used in aircraft, satellites, rockets and other aerospace aircraft. With the prosperity and development of the aerospace industry, the fasteners, known as the "industrial rice", are more and more valued by the upstream and downstream enterprises in the aerospace industry. People are soberly aware that every part and every screw of the seemingly insignificant fasteners plays a key role.

Aerospace fasteners are widely used in commercial and military aircraft, ballistic missiles, rockets, and are also supplied to the after-sales maintenance market. The development of tourism and the increasing demand for commercial aircraft are the main reasons for the growth of China's aerospace fastener market. The higher the degree of industrialization is, the more strict the market is, and the higher the fastener quality requirements and market value are. Compared with the automotive fastener market, the industrial fastener market such as electronics and communication equipment, the aerospace fastener market is the market with the highest added value and the most stable price. To ensure the safety and operability of the aircraft, aerospace manufacturers have continuously invested in technological innovation and fastener upgrades, which also plays a positive role in promoting the entire aerospace market.

From the development of the global aerospace fastener industry, it can be divided into the following stages:

First-generation (general-purpose fasteners)

To solve the connection problem, it only requires the connection function. The material is mainly carbon structural steel, with low strength and large structure.

Second-generation (high-strength fasteners)

The introduction of ISO standards, tensile tests and grade concepts, materials use a large number of alloy structural steel, a small amount of austenitic stainless steel.

Third-generation (high-strength fatigue-resistant fasteners)

Material major innovation, a large number of high temperature alloy, cymbal alloy, two-way layer stainless steel, composite materials. Introduction, vibration test, fatigue test, lasting test and other tests to simulate the state of use, reinforcement strength index and fatigue resistance performance index, level concept dilution.

Fourth generation (ultra-high strength fasteners)

The company is a "Member of China Interior Decoration Association", "National Excellent Enterprise in Air Interior Decoration", and was rated as "Top Ten Brands of Electric Curtains", with 7 product patents, and it is well-known in the industry.

Fifth-generation (general-purpose fasteners)

The combination of multiple parts requires a high consistency of each zero-live. The

agreement of the individual materials

Sex directly affects the final performance of the entire component product.

At present, the fasteners produced by many enterprises in the industry in China are at the level of the first generation of general fasteners, with low strength, large structure, difficult price increase, and excess capacity, and the market competition is fierce. High-end fasteners used in the fields of automobile, ship, wind power, nuclear power and other fields are in the second and third generation, and their materials have high technology content, strength and fatigue resistance are greatly enhanced. The high-end fasteners applied in aerospace and other fields have basically reached the level of the third generation of fasteners, and are gradually making the transition to the fourth and fifth generations.

There is still a gap between China's aviation fasteners and the world's advanced countries in terms of variety, grade and production capacity, which seriously hinders the development of new aircraft. Therefore, accelerating the transformation of existing equipment, reasonable reorganization of institutions, the introduction of necessary international advanced manufacturing technology and equipment and the direct adoption of international technical standards and inspection standards, can make China's aviation standard parts reach the world advanced level. The aerospace fastener industry has high requirements on technology and capital, and the technology monopoly of this industry is high. Enterprises must improve production efficiency, improve product quality, and meet the personalized needs of different customers through continuous research and development. Only enterprises that have accumulated long production experience in long-term production practice and have mature technology and reliable production process can maintain their dominant position for a long time.

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