At present, the safety of threaded connection in the manufacturing, production and maintenance of aerospace engines has been highly valued. Especially for self-locking nuts, because of their good shock resistance, loosening resistance and reusability, they have become a widely used thread in the aviation industry. Connect the components. The self-locking nut uses plastic deformation to form friction on the thread pair to prevent the thread from loosening. However, the self-locking torque between the thread pair will gradually decrease during repeated use, especially in the case of engine impact or significant load changes obvious.

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Hydrogen embrittlement fracture of bolts is a common form of failure. Because hydrogen embrittlement fracture is delayed and concealed, the damage it brings is much greater than the damage caused by other fractures. Since this century, hydrogen embrittlement fractures of alloy steel bolts have been commonplace, seriously hindering the normal development order of aerospace models, and have reached the level of "talking about hydrogen discoloration". In order to enable more scientific and technical personnel to understand the mechanism of hydrogen embrittlement, grasp the law of hydrogen embrittlement of bolts, and effectively prevent the occurrence of hydrogen embrittlement of bolts, the results of these studies are now written and introduced for readers' reference.

Hydrogen embrittlement fracture of bolts is a common form of failure. Because hydrogen embrittlement fracture is delayed and concealed, the damage it brings is much greater than the damage caused by other fractures. Since this century, hydrogen embrittlement fractures of alloy steel bolts have been commonplace, seriously hindering the normal development order of aerospace models, and have reached the level of "talking about hydrogen discoloration". In order to enable more scientific and technical personnel to understand the mechanism of hydrogen embrittlement, grasp the law of hydrogen embrittlement of bolts, and effectively prevent the occurrence of hydrogen embrittlement of bolts, the results of these studies are now written and introduced for readers' reference.

Hydrogen embrittlement fracture of bolts is a common form of failure. Because hydrogen embrittlement fracture is delayed and concealed, the damage it brings is much greater than the damage caused by other fractures. Since this century, hydrogen embrittlement fractures of alloy steel bolts have been commonplace, seriously hindering the normal development order of aerospace models, and have reached the level of "talking about hydrogen discoloration". In order to enable more scientific and technical personnel to understand the mechanism of hydrogen embrittlement, grasp the law of hydrogen embrittlement of bolts, and effectively prevent the occurrence of hydrogen embrittlement of bolts, the results of these studies are now written and introduced for readers' reference.

For the surface treatment of fasteners, people generally pay attention to aesthetics and anti-corrosion, but the main function of fasteners is to fasten parts, and surface treatment also has a great influence on the fastening performance of fasteners, so choose the surface When handling, the factor of fastening performance should also be considered, that is, the consistency of installation torque-pre-tightening force.

Brief introduction of several common standards for high temperature and high pressure fasteners

Fastener is a kind of mechanical part which is widely used for fastening connection. It is widely used in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments and supplies. It is the most widely used mechanical foundation. It is characterized by a wide variety of specifications, different performance uses, and standardization, seriation, generalization of the degree is also very high. Therefore, some people also call a kind of fastener with existing national standards as standard fastener, or referred to as standard fastener for short.

As a key functional part, high-strength fasteners play an important role in the function realization and safe operation of mechanical products. The correct use of high-strength fasteners is a link that cannot be ignored in the design and manufacture of mechanical products. At present, there is no unified method for the use of high-strength fasteners, and the practices of different industries and units are different. Therefore, it is necessary to communicate with each other and develop a scientific method of use to guide the design, manufacture, assembly and maintenance of products. Ensure the safe and stable operation of machinery. After researching and testing high-strength fasteners, this article summarizes the general use methods of high-strength fasteners from the aspects of characteristics, application, selection and assembly. Fasteners have a wide variety of specifications, large usage, and a wide range of applications. They are the most common type of standard parts in mechanical products. The reasonable selection of fasteners has also become an important part of the product design process. The correct use of the product directly affects the product's functional realization and safe operation. Compared with general fasteners, the use requirements of high-strength fasteners in product design, manufacturing, assembly, inspection and maintenance are very different. They also play a more critical role in the operation of equipment. Under the situation of diversified development such as large-scale, automation, and intelligence, high-strength fasteners are increasingly used as key functional parts, especially in critical occasions and important parts. At present, in the selection and use of high-strength fasteners, there are still various opinions and insufficient understanding, and it is necessary to do further research. This article mainly discusses the use of high-strength fasteners for mechanical products, and will not discuss the use of high-strength fasteners to replace general fasteners.