lock washer

Introduction of lock washer
All kinds of machines and parts can not be separated from fasteners in the connection and assembly. Fasteners have brought convenience to the machinery industry, but it has an inevitable weakness, that is, it will loosen itself in severe vibration, causing damage to parts or a complete device, disintegration and even accidents.
The lock washer can prevent the thread from loosening. There are many varieties of locking washers, including butterfly washers, saddle washers, spring washers, wave spring washers, etc., known as locking washers.
The above types of anti-loosening washers all rely on increasing static friction to achieve anti-loosening effect. The anti-loosening effect can meet the needs of enterprises under low vibration, light load and uniform speed. However, in the strong vibration, high load, fast motion state can not achieve complete anti-loose effect, only to extend the nut and bolt loose time.
In order to solve this problem, scientists around the world have done a lot of experiments and research. Finally, they broke through the common practice of increasing "pre-tightening force" and "friction force" to achieve the anti-loosening effect. Instead, they changed to the latest anti-loosening principle of combining "lifting tension" and "friction force" with "geometric wedge angle". This principle is not only used in washers, but also in nuts, the application of bolts solves the problem of loosening fasteners in heavy industry enterprises, and also solves the tedious installation without referring to the screwing-in torque and the screwing-out torque.
The most effective lock washer
It consists of two pieces of gasket. The outer side is a surface with radial relief, while the inner side is a bevel tooth surface. During assembly, the inner oblique tooth surfaces are opposite to each other, and the outer radial convex surface is in an occlusal state with the contact surfaces at both ends. When the connecting piece is vibrated and the bolt tends to loosen, only the inner oblique tooth surfaces of the two washers are allowed to move relatively, resulting in lifting tension, thus achieving a locking effect of 100%. Its anti-loose principle meets military standards. (US Military MIL-STD-1312 Standard). The lock washer is not only an anti-loose locking device, but also a high-load locking device, which can be applied to all strong vibration environments. If the lock washers are used and installed correctly, the nuts and bolts do not need to be tightened again and the fasteners are secured.
Installation and working principle of lock washer
1. The installation of the lock washer is very simple, just put the two washers on the inner side of the oblique tooth surface, between the nut and the connecting material.
2. After the nut is tightened, the radial convex surface on the outer side of the anti-loosening washer is engaged with the contact surfaces at both ends, and the slope angle of the inclined tooth surface on the inner side of the washer is greater than the thread angle of the bolt.
3. When the bolt is elongated due to mechanical vibration, the nut will rotate and loosen. The friction force of the outer radial convex surface of the anti-loosening washer is greater than the friction force between the inner oblique tooth surfaces, so that in this state, only the relative dislocation between the inner oblique tooth surfaces is allowed to generate lifting tension. Bolts are elongated bolt shrinkage.
4. When the bolt shrinks, the bevel surface of the washer will cause the nut to return to its original position.
5. The lock washer is only suitable for flat and smooth metal surfaces.
6. If the connecting material is a non-metallic material, a metal plate can be fixed to the connecting material, so that the lock washer can be used.
7. It is not necessary to use a torque wrench when installing the lock washer.
8. Pneumatic tools can also be used when installing or removing lock washers.
Application industry of lock washer
Scope of application
The lock washer is applicable to the equipment with frequent vibration, such:
Automotive industry-cars, trucks, buses
Compressor
Construction machinery
Wind power generation equipment
agricultural machinery
foundry industry
Drilling equipment
ship industry
Military
Mining Equipment
Oil drilling rig (onshore or offshore)
Utilities
Rail Transit
Drive system
Metallurgical equipment
rock hammer
lock washer features
Ensure that the installed components are safe and reliable
Prevent bolt loosening due to vibration
Simple installation and disassembly
Its performance remains unchanged under lubrication
Temperature changes will not loosen
have durability
Reusable
Main features of lock washer
The surface coating is B633-98 in accordance with American Standard for Testing Materials and does not contain hexavalent chromium.
Each batch passed the microhardness test after heat treatment.
Can be used for 8.8 grade, 10.9 grade, and 12.9 grade high strength bolts.
Material of lock washer
Industrial lock washers are mostly carbon steel and stainless steel.
The hardness of carbon steel is in the Vickers 465, and the working temperature is below 180 °.
The hardness of stainless steel is 520 Vickers and the working temperature is below 420 °.