Why do hex bolts should be loosened for better, more durable and more useful things? So, what are the anti-loose methods for hex bolt connections? Here are five types, first: friction and anti-loose method; second: mechanical anti-loose method; third: permanent anti-loose method; fourth: riveting and anti-loose method; fifth: structural anti-loose method.
This is the most widely used method of anti-looseness. This method produces a positive pressure between the thread pairs that does not follow the external force, so as to produce a frictional force that can restrain the relative rotation of the thread pair. This positive pressure can be achieved by axially or simultaneously pressing the thread pair in both directions. Such as elastic washers, double nuts, self-locking nuts and nylon insert lock nuts. This anti-loose method is convenient for disassembling the nut, but in the environment of striking, vibration and variable load, the pre-tightening force of the bolt will be caused by the looseness at the beginning, and the pre-tightening force is lost as the number of vibrations increases. Increase, the ultimate will lead to loose nuts, threaded joint failure.
Use split pins, stop washers, string wire ropes, etc. The method of mechanical anti-loose is relatively reliable, and the method of mechanical anti-loose is used to deal with important joints.
Spot welding, riveting, bonding, etc. This method mostly smashes threaded fasteners during disassembly and cannot be reused.
Riveting and anti-loose
After tightening, the method of punching, welding, bonding, etc. is received, so that the thread pair loses the active side characteristics and the connection becomes a disconnection. The disadvantage of this method is that the bolt can only be used once, and the disassembly is very difficult, and the bolt must be detached to be detachable.
The structural anti-loose does not depend on the manpower outside the circle, but only depends on its own structure. The structural anti-loosening method, that is, the Tang's thread anti-loose method, is also the best anti-loose method to start and get the result, but it is not known to most people.
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