Introduction to the role of the iron ring between the nut and the bolt


We often add one or two iron rings between the nut and the bolt, so what is it for? Below, the editor will introduce it to you. Flat washers are also called flat washers, which are mainly stamped out of stainless steel plates, and generally look like a flat washer with a hole in the middle. The hole size specifications and models are generally determined according to user needs. Flat washers are generally thin pieces of various shapes to reduce friction, prevent leakage, protect, prevent shedding or disperse working pressure. Such components are found in many materials and structures to perform various similar functions. Limited by the raw materials and processing technology of external thread standard parts, the supporting surface of standard parts such as bolts is not large. Therefore, in order to reduce the compressive stress on the pressure-bearing surface and protect the surface of the connected parts, a sealing ring is used. It is generally used for high-frequency parts to enhance the support surface and cover relatively large holes to avoid damage to the surface of the parts. Large sealing rings are mostly used for wooden parts. Flat washers are generally used in joints, one is made of soft material, and the other is made of hard material and is more brittle. Its main function is to expand the contact area, disperse the pressure, and prevent the soft material from being crushed. The part between the connected part and the nut. Generally, it is a flat metal ring, which is used to ensure that the surface of the connected parts will not be scratched by the nut, and to disperse the pressure of the nut on the connected parts. The flat washer is to increase the total contact area and prevent the friction between the bolt and the casting; the main function of the flat washer is to protect the surface of the connecting piece and prevent the surface of the workpiece from being scratched when the bolt and nut are tightened. It is widely used in non-stressed structures, and its advantages are low cost, convenient installation, and suitable for places where assembly and disassembly are frequent. Spring washers are often called spring washers in the field of screws. Its materials are 304 stainless steel and alloy steel, and carbon steel is iron. Common spring washers are M3, M4, M5, M6, M8, M10, M12, M14, M16. This type of size is more common. The basic function of the spring washer is to give the nut a force after the nut is tightened to increase the sliding friction between the nut and the bolt! It is a protective measure to prevent the loosening of the tightening bolts caused by the vibration of the equipment in operation. The fastening principle of the spring washer: the fastening principle of the spring washer is that after the spring washer is laid flat, the spring washer will form a continuous elasticity, so that the flange connection pair between the nut and the bolt always maintains a sliding friction force, resulting in torque resistance , so as to prevent the nut from loosening. At the same time, the oblique angles at the interface of the spring washer are placed into the surface of the bolt and the connected part respectively, thereby preventing the bolt from rotating relative to the connected part. However, practical experience has proved that the spring washer can only give an elasticity of 10N/m, and the elasticity of 10N/m can be ignored for a bolt torque of 280N/m. Secondly, with such a small force, the bevel at the wound of the spring washer cannot be inserted into the surface of the bolt and the connected part. After disassembly, there is no obvious indentation on the surface of the bolt and the connected parts. Therefore, the fastening effect of the spring washer on the bolt can be ignored.

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