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Silicone O-ring is a kind of silicone rubber, which is a one-component liquid rubber product vulcanized at room temperature.Once exposed to air, the silane monomers in it condense to form a network structure. The system is cross-linked, cannot melt and dissolve, is elastic, and forms a rubber product state. At the same time, the object is bonded.

1. The importance of the tightness of the O-ring

 Why should we introduce the severity of the failure of the O-ring?Because O-shaped sealing rings have been widely used in our daily lives, as large as ships, automobiles, aerospace equipment, as small as our daily water taps, gas valves, refrigerators, disinfection cabinets, washing machines, etc., When a small sealing ring fails, the consequences of some equipment are unimaginable, roughly as follows：

1.Design error: caused by insufficient understanding of the product by the purchaser.For example, the pressure on the seal is underestimated, the understanding of the contact stress distribution on the sealing surface is incorrect, and the design of the groove in which the seal is placed is unreasonable.

2.Seal quality issues: The production quality of seals is closely related to the reliability of the final product.Our company has undergone many inspections, investigations and product tests in production.In the process of supplying, true and accurate inspection reports can be provided.

3.Material selection error: There are several commonly used rubber sealing materials, and their characteristics are different, so the application is also different, so you should consider many aspects when choosing materials and learn more about O-ring sealing. Knowledge.

4.Improper use of seals: If a good seal is used improperly, it will also cause the entire product to fail, such as the wrong use of lubricating oil.

2. The difference between silicone O-rings and other rubber O-rings

Silicone O-ring is a kind of silicone rubber, which is a one-component liquid rubber product vulcanized at room temperature.Once exposed to air, the silane monomers in it condense to form a network structure. The system is cross-linked, cannot melt and dissolve, is elastic, and forms a rubber product state. At the same time, the object is bonded.Its thermal conductivity is slightly higher than that of ordinary rubber products, and once cured, it is difficult to separate the bonded objects.

Silicone O-rings are highly elastic polymer compounds.Including unvulcanized and vulcanized varieties.It can be divided into two categories: natural rubber products and synthetic rubber products.Natural rubber is processed from latex obtained from rubber plants.Synthetic rubber products are prepared by polymerization or polycondensation of monomers.Unvulcanized rubber products are commonly known as raw rubber products or raw rubber.Rubber products that have been vulcanized are called vulcanized rubber products, commonly known as cooked rubber products or erasers.It is widely used in the manufacture of tires, hoses, tape, insulation materials, rubber shoes, and other rubber products.

3. Several forming processes of O-ring

1. Molding: Molding methods are commonly used to manufacture certain rubber products with complex shapes such as leather bowls and O-ring seals, and the rubber material is placed in the mold and heated to form by means of molded yin and yang molds.

2. Injection molding: It is used for more complex rubber products, such as tire tread, hose, and wire surface coating, which need to be manufactured by injection molding.It is a method of continuously modeling the rubber compound with a certain plasticity into the hopper of the extruder under the extrusion of the screw through a variety of mouth shapes, also known as templates.Before pressing out, the rubber must be preheated to make the rubber soft and easy to squeeze out to obtain an O-ring with a smooth surface and accurate size.

3. Calendering and forming: it is suitable for manufacturing simple sheet and plate products.It is a method of pressing the mixed rubber into a film of a certain thickness and a width through a calendering machine, called calendering molding.Some textile fiber materials used in rubber products such as tires, tape, hoses, etc. must be coated with a thin layer of glue. Gluing on the fiber is also called gluing or wiping. The gluing process is generally completed on the calendering machine.The fibrous material needs to be dried and dipped and dried before calendering. The purpose is to reduce the water content of the fibrous material, so as not to evaporate and bubble the water and increase the temperature of the fibrous material to ensure the quality of the calendering process.Dipping is a necessary process before hanging glue. The purpose is to improve the binding properties of fiber materials and rubber materials.

4. Analysis of the influence of temperature on the reliability of the O-ring

Generally, the O-ring is composed of rubber, a polymer material. Its design and analysis involve theoretical knowledge of solid mechanics, tribology, polymer materials science, thermodynamics and mechanical manufacturing technology. Generally, finite element software can be used to analyze the O-ring.The O-ring is compressed and greatly deformed, resulting in stress to achieve the sealing of the hydraulic system.To meet the sealing performance of the O-ring, the maximum contact stress must be at least greater than the pressure of the sealing medium under the premise of ensuring that the shear strength of the O-ring is met.There are many factors that affect the stress of the O-ring, including sealing structure parameters such as compression ratio, structure size parameters, friction factor of the contact surface and environmental factors such as sealing medium pressure and temperature.By establishing a finite element model, the influence of influencing factors on the performance of the O-ring can be analyzed.It was found that the greater the pressure of the medium, the greater the contact stress and Mises stress; it was concluded that the maximum contact stress between the O-ring and the shaft increases with the increase of compression ratio and oil pressure, but under certain oil pressure, the Mises stress does not always increase with the increase of compression ratio.；

Studies have shown that the opening gap between the upper and lower flanges and the initial compression rate of the sealing ring have a greater impact on the maximum contact stress, while the chamfering radius of the sealing groove notch and the bottom of the groove has a significant impact on the shear stress; in actual engineering applications, the temperature of the sealing medium in the sealing system is often higher, and the increase in temperature will cause changes in the stress of the O-ring and accelerate the relaxation of the O-ring, so the temperature has a great impact on the reliability of the O-ring.