Why should hexagon bolt prevent loose, it is to can better more permanent more useful thing.So, hexagonal bolt connection what is the method of preventing loose?The following five kinds of introduction, the first: friction control method;Second: mechanical control method;Third: permanent prevention of loose law;Fourth: riveting punching control method;Fifth: structure prevent loose method.
1.Friction locking:This is the most widely used method to prevent loosing. This method breeds a positive pressure between the screw pairs that does not change with the external force, so as to breed a friction force that can restrain the relative rotation of the screw pairs.This positive pressure can be achieved by axial or simultaneous compression of the screw pair.Such as the adoption of elastic washer, double nuts, self-locking nuts and nylon insert lock nuts.This anti-loosening method to deal with the removal of the nut is more convenient, but in the impact, vibration and variable load environment, at the beginning of the bolt will cause the pretension drop because of relaxation, with the increase of the number of vibration, the loss of pretension to blunt increase, the ultimate will lead to nut loose, thread connection failure.
2.Mechanical locking：Use cotter pin, stop gasket and string wire rope.The method of mechanical loosening prevention is more reliable, and the method of mechanical loosening prevention should be used to deal with important connections.
3.Permanent locking：Spot welding, riveting, bonding, etc.This method is mostly used to crush thread fasteners during disassembly and cannot be reused.
4.Riveting and locking：After tightening, the method of impact point, welding and bonding can be adopted to make the screw pair lose its activity and become a non-detachable joint.The disadvantage of this method is that the bolt can only be used once, and it is very difficult to remove it.
5.Locking structure：But the structure prevents loose does not depend on the outsider force, only depends on own structure.The method of structural looseness control is the method of down thread looseness control, which is the best method of looseness control at present, but is not known by most people.
hex bolts
Post time: Aug-02-2019