Relevant requirements of high-strength bolts for joint fusion surfaces

When the high-strength bolts are tightened, the connecting plate and the pregnant mother generally have to go through a key production process of "sand blasting" or "shot blasting rust removal". In transportation and construction sites, it is necessary to ensure the fusion surface before construction to check the surface roughness and cleanliness level. According to regulations, maijin does not allow a little bit of soil layer and dirt air pollution on the fusion surface. When the surface roughness of the fusion surface of high-strength bolts does not meet the design requirements, sandblasting or shot blasting treatment must be carried out on site again, and then the construction work can be carried out. Assembly companies need to pay special attention to maintaining the cleanliness of the connection surface and the characteristics of the friction surface of the connecting plate matrix where the high-strength bolts meet. The high-strength bolt connection pair is produced and supplied by the production and processing manufacturer to the service facility according to the production batch number. Therefore, all high-strength bolts should have a product qualification certificate. The way, specification and model of the high-strength bolt connection pair, as well as professional specifications, should meet the requirements of GB1228-1231-91 (big hexagon). When using the composition, it must meet the requirements of the national standard for construction, and the high-strength bolt connection pair must be stored, transported and supplied in the same batch of service facilities. The high-strength bolt connection pair should be light and light during the whole process of loading, loading, transportation and storage, so as to prevent the wooden packing box from being damaged and endangering the anchor screws. In the case of the use of high-strength bolts, a relatively common difficulty is the occurrence of displacement. So in the production process, how do we avoid the occurrence of displacement? Let's take a look at it below. On symmetrical high-strength bolt products, a symmetrical accurate positioning hole can be added in order to prevent mistakes in the bending process. When bending, the rough surface of high-strength bolt products should face the direction of bending force as much as possible to prevent the burrs from being torn apart by tensile force. If it is not allowed, try to set up a processing hole to take this opportunity to accurately locate. Rolling is a unique curved roll hole. The outer diameter specification is determined by the material thickness of the rolled iron casting. The outer diameter should be larger if it is thicker, generally d>1.5 is fine. It is not necessary to build the axis of the curling on the core of the metal sheet. If the plane of the metal sheet is used to build it at the intersection of the cylinders, the production will be more economical. Therefore, during the use of high-strength bolts, this method can prevent the occurrence of displacement and ensure their better characteristics.