What are the main uses of high strength nuts?

The high-strength nut pair after heat treatment is grade 10, and it is used in conjunction with the bolt of grade 10.9. There are certain differences between high toughness bolts and their general bolt calculation methods and bearing characteristics. Generally, the bolts bear the external load at the same time, and the bearing capacity of the high-strength nut is used to increase the pre-tension force inside, and then the friction force is generated by the contact area in the middle of the connector to bear the external load. The axial force of the high-strength nut is lower than the friction force, the connection will not be damaged, and the prefabricated component will not easily roll. It uses a special wrench to tighten the bolts, resulting in a particularly large and controllable preload. Using spacers and nuts, the pre-working pressure on the connection is the same. Under the action of prestressed tension, a very large friction force is caused to follow the connection surface. Therefore, the structure of the high-strength nut is relatively simple, and its physical properties are very good. It can be disassembled, relieves fatigue, and is not easy to loosen under dynamic load. It is a very good connection method for development. The connection principle of high-strength nuts is like this. The connection of high-strength nuts is based on the friction between the contact areas to avoid rolling. In order to make the contact areas have sufficient friction, it is necessary to increase the clamping force and increase the friction coefficient of the contact areas. The previous clamping force of the prefabricated component is realized by adding pre-supporting force to the bolt, so the bolt must be made of high-strength steel plate. In the connection of high-strength bolts, the greatest impact on load bearing is the coefficient of friction. The Maijin experiment shows that the friction coefficient is mainly affected by the material of the parts and the form of the contact area. Sand blasting and steel brush cleaning are often used to remove the contact area of ​​the components in the connection range and thereby increase the friction coefficient of the contact area. Therefore, high-strength nuts are divided into two types: friction type and pressure type.