The anti-loosening method of bolts has always been a problem that machine processors want to understand. What kind of anti-loosening is good?What kind of anti-loose method can achieve the effect of anti-loose, and the cost of anti-loose is relatively low?In actual production, the more common ways to relax are spring washers, locking steel wires and self-locking nuts.
XNUMX. Using spring washers to prevent loosening
The combined bolt design method of bolt plus spring washer plus flat washer is a relatively common design method. Many designers regard this design method as inertial thinking. As long as bolts are used, bolts, flat washers and spring washers must be used. .
From the analysis of the results of the lateral vibration anti-loosening test, it can be seen that the spring washer has no anti-loosening effect at all, and the vibration test result of the spring washer is even worse than that of the flat washer.For the bolts of the spring washers, we will find that when the bolts continue to be tightened during the tightening test until the bolts are broken, the spring washers will even be slowly unscrewed, so the spring washers have rotated out.
The use of spring washers to prevent loosening is mainly for small bolts, such as electrical connections. If the pre-tightening force is relatively large, two sides of the spring washer will appear. It was originally used to prevent loosening, but when the pre-tightening force is large , There may be reverse cutting into the connected part, which will cause the bolt contact surface to be uneven, and even damage the surface of the bolt and the connected part.
XNUMX. Lock the steel wire to prevent loosening
Locking steel wire anti-loosening is some of the more commonly used anti-loosing methods, especially used in the connection of some large-scale machinery and equipment.This kind of anti-loose method is not suitable for the production of large quantities of products, and does not use mechanization and automatic installation.
The winding direction of the steel wire needs to be careful, which is the direction in which the tightening bolts are tightened, and the locking of the steel wire to prevent loosening generally requires two bolts or one bolt to be perforated in series with another part.The anti-loosening method of the locking wire can not only have a certain anti-loosening effect, but also mainly play the role of falling after the bolt is loose or after the bolt is broken.
Three, self-locking nut anti-loosening
Self-locking nuts are divided into two types: all-metal self-locking nuts and nylon insert self-locking nuts. All-metal self-locking nuts will have opposite side pressing and head pressing, and there are types such as adding metal collars, mainly to make threads Deformation increases the effect of a certain screw-in and screw-out torque.
This kind of anti-loose does not have a very large anti-loose effect. The anti-loose effect can be clearly seen in the transverse vibration test. The anti-loose is slightly better than ordinary bolts and nuts, but the effect is also very limited.
Other commonly used anti-loosening methods include gluing, NORDLOCK, double nut, split pin and other methods, which are relatively common in actual processing and production.
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