Maintenance-free bronze bearing size chart equivalent and guide bushes, bronze with solid lubricant plugged graphite, SOB bushing equivalent, Sankyo oilless Alternatives

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Oilless Bushing Specifications:

GRAPHITE IMPREGNATED OILLESS BRONZE BUSHING WORKING PRINCIPLE & ADVANTAGES

The working principle of a graphite impregnated bronze bushing and copper sleeve :Generally solid lubricant accounts for 20-30% of friction surface, graphite and copper set of self-lubricating bearing lubrication principle is in the process of sliding friction of shaft and bearing, part of the graphite particles transferred to the shaft and the bearing friction on the surface, formed a relatively stable layer of solid lubricant membrane, prevent the shaft and bearing directly adhesive wear. This reasonable combination of metal alloy and non-metal wear reducing materials of their respective performance advantages, complementary, that is, with the metal’s high bearing capacity, but also get the wear reducing material lubrication performance. Therefore, it is especially suitable for no refueling, less refueling, high temperature, high load or water environment.

The application of graphite impregnated bronze bushing: Self-lubricating bearing, is the copper sleeve as a metal matrix friction surface to develop an orderly arrangement, the size of the appropriate holes, and embedded graphite or molybdenum disulfide as a solid lubricant, a self-lubricating product. At present, the graphite impregnated bronze bushing has been widely used in construction machinery, metallurgical machinery, mining machinery, locomotive support, steel rolling equipment, Marine machinery, die equipment, textile machinery, gas turbine and other low-speed heavy-duty, high-speed light load and other occasions.

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Tailored Service.
Large Machining Capacity.
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Engineering Sleeve Bushing Solution and Design. The Graphite impregnated bush material has thermostable, inoxidizability, wear-resisting, self-lubrication merit. 

It is based on high strength copper alloy of special techniques. The solid lubricant is by certain angle, density and special formula, and then is processed exactly. The bronze graphite bearings parts is widely applied to casting machine, mining machinery, shipping, steam turbine, Injection machinery and automobile mounding, etc.

Advantages of graphite plugged bronze bushings:

1. Good bearing capacity and good wear resistance;
2. Suitable for high load & low speed under the rotation movement, swing movement and often under the load open and close frequent and difficult to form hydrodynamic lubrication occasions;
3. Under the condition of boundary lubrication, the bearing can be maintained without refueling for a long time, while the bearing can have a longer service life with refueling in the upper layer;
4. The surface plastic layer can be left with a certain margin during the processing and forming, and can be processed by ourselves after the assembly is pressed into the seat hole, so as to achieve a better assembly s*Graphite Impregnated Oilless Bronze Bushing Supply Company. Customized Design Service: Metric Graphite Impregnated Oilless Bronze Bushing Customized Size!ize.

*Graphite Impregnated Oilless Bronze Bushing Supply Company. Customized Design Service: Metric Graphite Impregnated Oilless Bronze Bushing Customized Size!

Solid inlaid self-lubricating bearing is a product made of solid lubricant with certain shape and strength on the friction surface of ordinary sliding bearing (sleeve), bearing bush, slider, guide rail, and other parts with relative mechanical movement, through reasonable holes and grooves, and embedded in the hole grooves. Embedded lubricants include graphite, sulfide (molybdenum disulfide, tungsten disulfide, etc.), calcium fluoride, synthetic resin, polytetrafluoroethylene, etc. The thermal expansion coefficient of the embedded solid lubricant is greater than that of the embedded substrate, and the type of the embedded solid lubricant can be selected according to the working condition.
In view of the characteristics of oil (grease) lubrication, the relevant people at home and abroad continue to study lubrication technology, in the 1920s in the developed countries developed inlaid self-lubricating bearings, in the 1940s in the United States took the lead in the form of products, then Japan, Germany has also launched similar products.

What are the effects of aluminum, manganese, iron, tin, nickel, and lead content on cast copper alloys:

Alloying elements such as aluminum, manganese, iron, silicon, tin, nickel, and lead are usually added to improve the properties of common cast brass (copper-zinc binary alloy). Usually the aluminum, manganese, iron, silicon, tin, nickel and other 5 kinds of alloy elements of the sum of more than 2% of the cast brass is called high strength brass alloy (high force brass is high strength copper alloy). These elements affect the properties of cast brass.

(1) iron

The addition amount of ordinary brass is 0.3% ~ 0.5%, and the addition amount of multiple brass is 1% ~ 3%. The solid solubility of iron in copper is 0.1%-0.2%, and the high melting point of iron-rich phase compound is formed when iron exceeds this amount. Iron can refine the grain, improve the strength and hardness; When the content is too high, too many brittle compounds appear on the grain boundary, resulting in the decrease of strength, plasticity and corrosion resistance.

(2) manganese

When the amount of manganese is 2% ~ 4% in casting brass, the manganese can be dissolved in α brass in copper, and the brittle phase rich in manganese can be precipitated at room temperature. Its effect is: a small amount of manganese has a solid solution strengthening effect, improve the strength of the alloy but the plasticity is not significantly decreased; When zinc content in brass exceeds 35%, if manganese content exceeds 4%, brittle phase will appear, damaging plasticity and toughness.

(3) aluminum

The addition amount of cast brass is 2% ~ 7%. Stable β phase is formed in copper to prevent brittle γ phase from appearing. Its influence is: a small amount of aluminum can make α brass β phase, (α+β) brass β phase increase, is an important alloying element in high strength brass; When the aluminum content is high, the plasticity and toughness of the alloy decrease, and when the zinc content is high, the “cold and brittle” of the casting is caused.

(4) silicon

The addition amount in cast brass is 2% ~ 4.5%. The brittle phase Cu2Si is formed in brass. Its effect is: a small amount of silicon can make the alloy strength and hardness significantly increased, plasticity decreased; To reduce the solidification temperature range of the alloy and improve the casting properties of the alloy.

(5) lead

In casting brass, the amount is 1% ~ 3%, and fine free particles are formed in brass. Its effect is to improve the cutting performance and wear resistance of the alloy. The hardness and plasticity of the alloy are significantly reduced after 3%.

(6) tin

Less than 1% in cast brass, it is soluble in alpha solid solution. Its effect is to form a SnO2 protective film on the surface of the casting. Significantly improve the corrosion resistance of brass to sea water, so tin brass is suitable for shipbuilding industry, “naval brass” said.

(7) nickel

In the cast brass, the amount is about 1%. It can expand the alpha phase region. Its effects are as follows: refining grain size and improving corrosion resistance of alloy; It can improve the hardness of the alloy, but the effect is not significant.

Characteristics and function of graphite copper sleeve

Professional casting of all kinds of brass, bronze. Such as tin bronze, aluminum bronze, copper pipe, copper rod, copper tile, copper worm gear, copper slide plate and so on. Adopts the advanced centrifugal casting process, the quality is stable, the performance is excellent, conforms to the international standard
Graphite copper sleeve – is a kind of self-lubricating copper sleeve with high strength copper alloy as matrix and graphite as lubricant. Some customers also call it copper sleeve with black spot. This new product can completely replace the traditional copper sleeve with oil injection through the oil groove to achieve the lubrication effect.

The oil groove copper sleeve needs regular refueling and maintenance in the process of use to ensure its lubrication. If it is not refueling and maintained for a long time, the lubrication effect is lost, then the friction coefficient of the copper sleeve will increase, the wear amount is large, and it will soon be scrapped. Moreover, the oil groove copper sleeve is not easy to use in a high temperature environment, and improper treatment of the oil groove burr will cause damage to the shaft. The graphite copper sleeve produced by Chenhan Bearing has the following characteristics:

One, no need to add lubricating oil or grease as a lubricant.

Two, can operate normally at 300° high temperature, and there will be no burning tile, burning shaft phenomenon.

Three, graphite copper sleeve itself does not need to open the oil groove, through its matrix embedded graphite in the process of operation to form an oil film to play a role in self-lubrication, and can protect the shaft from being pulled.

Four, strong compressive capacity, high load, high hardness, low friction coefficient.

Five, high precision, good walking performance.

6. It is suitable for reciprocating, rotating, swinging and intermittent movement where oil film is difficult to form.