What are the methods to prevent the loosening of anti-loosening screws?

During the process of using tools, we often find that anti-loosening screws become loose after being used for a period of time. So, what are the methods to prevent the loosening of anti-loosening screws?

1. Anti-loosening through friction

This is a widely used anti-loosening method. This method generates a positive pressure between the threaded pairs that does not change with external forces, thereby creating a frictional force that can prevent the relative rotation of the threaded pairs. This positive pressure can be achieved by axially or bidirectionally pressing the threaded pair. Such as elastic washers, double nuts, self-locking nuts, nylon insert lock nuts, etc. This anti-loosening method of Shengyuan Anti-loosening Screw Processing Factory makes it convenient to remove the nuts. However, under impact, vibration and variable load conditions, the bolts will initially reduce the preload due to loosening. As the number of vibrations increases, the lost preload force will gradually increase, causing the nut to loosen and the threaded connection to fail.

Ii. Mechanical anti-loosening

The relative rotation of the threaded pair. For example, use cotter pins, series steel wires and stop washers. Since the stop member has no preload, when the nut loosens to the stop position, it can prevent the stop member from loosening. Therefore, this method is actually not to prevent loosening but to prevent detachment.

Iii. Riveting and anti-loosening

After tightening, the moving pairs are connected into a non-detachable connection by means of punching, welding, bonding and other methods. The disadvantage of this method is that the bolts can only be used once, and disassembly is very difficult. Before disassembly, the bolt pair must be damaged.

Iv. Structural anti-loosening

Adopt a threaded auxiliary structure. The first three anti-loosening methods mainly rely on third-party forces for anti-loosening, mainly referring to frictional forces. Their anti-loosening effects depend on the magnitude of the third-party forces. Structural anti-loosening does not rely on third-party forces but only on its own structure. The structural anti-loosening method is the Down's thread anti-loosening method, which is also an effective anti-loosening method at present, but most people are not aware of it.

If we install the tools, we can protect them through the above four methods, so that we can prevent the anti-loosening screws from being loosened too quickly.