China Hex Bolt Manufacturers introduced why the cylinder head hexagon socket bolts should be loosened?

1. Friction anti-loosening: This is the most widely used anti-loosening method. This method produces a positive pressure between the thread pairs that does not follow the external force to produce a friction force that can restrain the relative rotation of the thread pairs. . This positive pressure can be achieved by pressing the thread pair axially or simultaneously in two directions. For example, elastic washers, double nuts, self-locking nuts and nylon insert lock nuts are adopted. This kind of anti-loosening method is more convenient for disassembly of the nut, but in the environment of impact, vibration and variable load, the pre-tightening force of the bolt will drop due to the relaxation at the beginning. As the number of vibrations increases, the lost pre-tightening force is dull. The increase will eventually lead to the loosening of the nut and the failure of the threaded connection.

2. Mechanical anti-loosening: use split pins, stop gaskets and string wire ropes. The mechanical anti-loosening method is relatively reliable, and the mechanical anti-loosening method should be used to deal with important connections.

3. Permanent anti-loose: spot welding, riveting, bonding, etc. In this method, most of the threaded fasteners are crushed during disassembly and cannot be reused.

4. Riveting and anti-loosening
After tightening, methods such as punching, welding, and bonding are used to make the thread pair lose the characteristics of the movable pair and the connection becomes impossible to disconnect. The disadvantage of this method is that the bolt can only be used once, and the disassembly is very difficult, and the bolt pair must be crushed to be disassembled.

5. Anti-loose structure: do not rely on manpower outside the circle, only rely on its own structure. The structural anti-loosening method, namely the Down's thread anti-loosening method, is also the best anti-loosening method at the beginning and result, but it is not known to most people.

Through the above introduction, China Stud Bolt Supplier hopes that you can simply refer to the content of this article in future use.