Category: Manufacturing Technology knowledge

Ethylene propylene rubber is an elastomer made by copolymerization of ethylene, propylene or ethylene, propylene and a small amount of non conjugated dienes under the action of catalyst by solution method or suspension method. Ethylene propylene rubber can be divided into ethylene propylene diene monomer (EPDM) and ethylene propylene diene monomer (EPDM). Ethylene propylene rubber has excellent aging resistance (the best of general-purpose rubber), ozone resistance and heat resistance (ethylene propylene rubber can be used for a long time at 150 ℃ and intermittently at 170 ℃). Ethylene propylene rubber has the lowest specific gravity, can be filled with high…

O-ring belongs to extrusion seal, that is to say, it achieves the sealing purpose by compression deformation. Extrusion is the most commonly used type of seal, accounting for about 50%. Therefore, the wide application of O-ring is inseparable from its characteristics:  Good sealing effect, suitable for static, reciprocating and rotary seals Small and compact space; Easy to assemble and replace; ④ Wide application scope; ⑤ No adjustment is required; ⑥ Low friction; ⑦ Low price; ⑧ It can be sealed in both directions. Therefore, it is widely used in aircraft, bicycles, oil pressure, air pressure equipment, vacuum equipment, electronic…

1、 Process introduction The spray type freezing trimming machine is fully called the automatic spray type freezing trimming machine. The freezing trimming theory originated in Europe and the United States in the 1970s, and was later improved by Japan. The equipment is mainly used to remove burrs from rubber molded parts, precision injection molding and die-casting products instead of manual processing. Such equipment has been widely used in developed countries since the late 1970s, After 2000, it was gradually promoted in China and became one of the necessary equipment for the next process in the rubber and plastic industry. 2、…

Classification according to source and use: natural rubber, synthetic rubber; Synthetic rubber is also divided into general synthetic rubber and special synthetic rubber. Natural rubber Natural rubber mainly comes from clover rubber trees. When the skin of this rubber tree is cut, milky juice, called latex, will flow out. The latex can be condensed, washed, shaped and dried to obtain natural rubber. Synthetic rubber is made by artificial synthesis. Different kinds of rubber can be synthesized by using different raw materials (monomers). From 1900 to 1910, chemist C.D. Harris determined that the structure of natural rubber was a polymer of…

Natural rubber and neoprene rubber are generally used as rubber damping pads. Nitrile rubber is required for oil resistance, silicon rubber is required for high and low temperature resistance, and butyl rubber is required for high damping. The manufacturing process of rubber shock pad products is similar to model products except that rubber air springs are similar to tires. It is usually made into supports or connectors and widely used in various vehicles, ships, machinery, instruments, bridges and buildings to eliminate or mitigate the adverse consequences of vibration. Rubber is characterized by both high elasticity and high viscosity. The elasticity…

1. Do not damage the sealing surface or sealing line of the sealing element surface The sealing performance of plane seals depends on the upper and lower end faces; The sealing performance of hydraulic seals depends on the lip line associated with the hole or shaft. These parts are composed of special materials that are soft and resilient, which are resistant to temperature, corrosion and aging, such as graphite, rubber, plastic and fiber, which are vulnerable to damage. Therefore, special protection and care should be given in the process of handling, installation and pipe protection. Once damaged, it often leaves…

Hydrogenated nitrile rubber is obtained by selectively hydrogenating butadiene group in nitrile rubber. The performance of hydrogenated nitrile rubber O-ring seals depends on the content of CAN (18% - 50%) and carbon carbon bond saturation. Its main characteristics are: good heat resistance, organic peroxide vulcanized materials can be used continuously for more than 1000 hours at 160 ℃, while NBR loses its continuous use value at 150 ℃; The oil resistance is excellent, and the performance of oil resistance and alcohol based oil resistance is greatly superior to the corresponding NBR and NBR/PVC blends; Low temperature resistance is better than…

1. Main performance The section of the Y-shaped seal ring is Y-shaped, which is a typical lip shaped seal ring. It can be divided into wide type, narrow type and Yx type according to the different proportion of height and width of its section. According to whether the two lips are equal in height, they can be divided into Y-shaped seal rings with equal height for shafts and holes, Y-shaped seal rings with unequal height for shafts and Y-shaped seal rings for holes, Y-shaped sealing ring is widely used in reciprocating sealing device, and its service life is longer than…

Improper design and use of O-ring will accelerate its damage and lose its sealing performance. The experiment shows that if each part of the sealing device is reasonably designed and the pressure is simply increased, the O-ring will not be damaged. Under the working conditions of high pressure and high temperature, the main reasons for O-ring damage are the permanent deformation of O-ring materials and the gap bite caused by O-ring being squeezed into the sealing gap. The primary O-ring appears distorted during movement. 1. Permanent deformation Because the synthetic rubber material used for O-ring seal ring is viscoelastic material,…