What is the role of flat washers in bolted connections? -

Flat washers are usually thin pieces of various shapes that are used to reduce friction, prevent leakage, isolate, prevent loosening, or distribute pressure. Many materials and structures have such components, which are used to perform various similar functions. Limited by the material and process of threaded fasteners, the supporting surface of bolts and other fasteners is not large. Therefore, in order to reduce the compressive stress of the pressure-bearing surface and protect the surface of the connected part, washers are used. First of all, the role of flat washers in bolt connections: When bolts need to be disassembled frequently, in order to protect the surface of the connected part from being scratched, it is generally necessary to place a flat washer at the position of the nut or bolt head to prevent the surface of the connected part. Not scratched anymore. In some joints where the friction coefficient is required to be more precise, such as high-strength prestressed bolts, flat washers are required at the nut end. In this case, the bolts, nuts, and washers are all provided by the same manufacturer. The bolt manufacturer needs to correct Nuts and washers are treated accordingly to ensure that the coefficient of friction between the nuts and washers remains consistent. When the bolt strength is relatively high and the allowable compressive stress of the connected part is relatively low, in order to reduce the compressive stress of the pressure-bearing surface of the connected part, it is generally necessary to add a flat washer. In a bolt connection, the pressure transmission of the bearing surface of the bolt head or nut is gradually enlarged in a trumpet shape. The larger the bearing surface, the smaller the compressive stress. Therefore, the addition of a flat washer can reduce the compressive stress of the contact surface of the connected part. Ensure that the bolt connection is effective. In some occasions, in order to ensure the one-to-one correspondence between the bolt holes between the two connecting pieces, we need to increase the diameter of the hole to compensate for the position deviation of the hole. When the bolt hole exceeds the standard requirement, a flat washer needs to be added. Sometimes for the convenience of installation and adjustment, the bolt holes will be made into long holes, so that the installation position of the workpiece can be adjusted within a certain range. When long holes are used, thick flat washers must be used, more specific, or even special washers or more washer. The role of spring washers in bolt connections The main purpose of spring washers is to relax, and they are generally used in occasions where the pre-tightening force of the bolt is not high and the dynamic load is small. When the clamping length of the bolt is relatively short, the bolt stress relaxation is more obvious, and the spring washer can compensate for the stress relaxation. Experiments have shown that under dynamic load conditions, high-strength bolted spring washers have almost no anti-loosening effect, and will also cause rapid attenuation of bolt clamping force. Therefore, spring washers are rarely used in high-strength bolt connections abroad. The daily output of hardware-metal stamping products is 3 million punching times, and the mold can be produced within 4 days. Strictly abide by the confidentiality agreement. For more consultation calls: