The Role Of Flat Washers And Spring Washers And Selection Criteria

Washers are one of the more important auxiliary functions of fasteners. Washers are basically used wherever fasteners are used, and they mainly play the role of increasing the contact area between the bolt and the equipment used and tightening it. When using washers, it is often suitable for nuts and nuts to cooperate with each other, so it can also effectively prevent abnormal locking of bolts and nuts.

So how do we choose a suitable gasket? Next, Jinrui will take you to understand.

Flat Washers

The role of the flat washer:

1. Increase the contact area between the screw and the machine.

2. Eliminate the damage of the spring pad to the surface of the machine when the screw is unloaded. When used, it must be: spring washer-flat washer, the flat washer is next to the surface of the machine, and the spring is placed between the flat washer and the nut. The flat washer is to increase the stress surface of the screw. In order to prevent the screw from loosening, the spring washer plays a certain amount of buffer protection when the force is applied.

3. Although flat washers can be used as sacrificial pads. But more often it is used as a supplementary pad or a flat pressure pad.

advantage:

①By increasing the contact area, the parts can be protected from damage;

②By increasing the contact area and reducing the pressure between the nut and the device, it plays a protective role.

shortcoming:

① Flat washers cannot play the role of shock resistance;

②The flat washer also has no anti-loosening effect.

spring washer

The role of the spring washer：

1. The function of the spring washer is that after the nut is tightened, the spring washer gives the nut an elastic force and presses against the nut so that it is not easy to fall off. The basic function of the spring coil is to give the nut a force after the nut is tightened, increasing the friction between the nut and the bolt.

2. Spring washers generally do not use flat washers (except for the protection of fasteners and the surface of the mounting surface, the use of flat washers and spring washers is considered).

3. Flat washers are generally used in connecting parts, one is soft and the other is hard and brittle. Its main function is to increase the contact area, disperse the pressure, and prevent the soft texture from being crushed.

advantage:

①The spring washer has a good anti-loosening effect;

②The spring washer has good anti-seismic effect;

③ Low manufacturing cost;

④ Easy to install.

shortcoming:

The spring washer is greatly affected by the material and process. If the material is not good, the heat treatment is not well grasped, or other processes are not in place, it is easy to crack, so you must choose a reliable manufacturer.

Gasket selection criteria:

1. When choosing gasket materials, attention should be paid to the electrochemical corrosion problem when different metals are in contact. The material of the flat pad is generally the same as that of the connected parts, usually steel, alloy steel, stainless steel, aluminum alloy, etc. Copper and copper alloys can be used when electrical conductivity is required.

2. The inner diameter of the flat gasket is selected according to the larger value of the thread or screw diameter, and the outer diameter of the material to be connected is softer (such as composite material) or matched with the spring washer, and the larger value should be selected.

3. When choosing to put the W washer under the head of the bolt or screw, in order to avoid interference between the fillet under the head and the washer, a flat washer with inner hole chamfering can be selected.

4. Steel washers should be used for important bolts with larger diameters or to increase extrusion resistance. Steel washers shall be used for tension bolts or tension-shear composite bolt connections.

5. Special gaskets are applied to special requirements. If electrical conductivity is required, copper gaskets can be used; sealing gaskets can be used if air-tightness requirements are required.

In addition, when the flat gasket is stored, it must be within the most effective sealing time and has the necessary important characteristics:

1. In the case of a relatively harsh environment, it should be said that the flat gasket should be sealed. When a certain temperature and pressure are working, it is not easy to leak.

2. When the flat gasket is connected with the contact surface, it is necessary to better ensure the sealing, just like the good effect.

3. When the gasket is under pressure and under the influence of temperature, the anti-wrinkle ability should be better, otherwise the screw will be damaged and hard gas will leak.

4. Do not get infected when using flat washers.

5. The use of flat washers can be disassembled very well. This is the biggest effect of choosing flat washers.

6. Remember to ensure normal use at a relative temperature when using flat washers.

In order to make better use of flat washers, when choosing flat washers, try to choose flat washers dipped in anti-rust and anti-corrosion materials. This will not only save time and effort, but also play a good role in the flat washers.