Synthetic impregnating oil for sintered metal plain bearings
 

Copper Sleeve Bearing | Electrical Appliances

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Copper Sleeve Bearing oil impregnated bronze bushings

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Sleeve Bearing

Material: Copper oil-impregnated bushing

Copper Sleeve Bearing is self-lubricating and maintenance-free. These bushings have a porous bronze matrix impregnated with lubricant. The permissible sliding velocity for sintered bronze bushings is very high, making them suitable for rotating applications. bronzegleitlager.com offers a wide range of both straight and flanged sintered bronze bushings. Advantages of these bushings include:

• very high sliding velocity
• lubrication-free
• maintenance-free operation
• good frictional properties

Powder Metallurgy Process

High-automatic Production Lines, Remote Intelligent Control Systems please call. High quality.

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oil-impregnated, ready for installation, self-lubricating, maintenance-free.

Oil-impregnated sintered bearings are maintenance-free, self-lubricating constructional elements of high reliability and performance. The material has microscopic pores that are filled with liquid (approx. 30 percent by volume oil) or solid (MOS 2) lubricant, depending on the requirements.

The main feature of Copper Sleeve Bearing:

High frictional speed at low load
The bearings – cylindrical as well as collar bearings –
are available in many dimensions and are supplied ready for installation from stock.

Permissible loads and speeds

Coefficient of friction

The coefficient of friction depends on various factors:

• Surface quality of the material of the other component    Oil-impregnated bearings: approx. 0.05 – 0.10

• Sliding speed

• Temperature                    Bearings with solid lubrication: approx. 0.15 - 0.25

Copper Sleeve Bearing is manufactured using the powdered metal process. This process ensures the uniform distribution of pores between the bronze particles which absorbs the oil by capillary action. In addition, our bearings have a self-contained oil supply which provides a uniform protective film over the entire bearing surface.
 

Copper Sleeve Bearing are manufactured using the powdered metal process. This process ensures the uniform distribution of pores between the bronze particles which absorbs the oil by capillary action. In addition our bearings have a self-contained oil supply which provides a uniform protective film over the entire bearing surface. are several steps involved in how the powdered metal process works, but the end result can be a low-cost, high-quality powdered metal part. Listed below is the typical sintered metal casting process in order:

Blending – This is the process of combining metal powders or alloys together with lubricants to produce a homogeneous mix.

Briquetting – This process is where metal powders or alloys are compressed while restricted in a die, at pressures as low as 10 to 45 tons per square inch.

Sintering – Here each individual particle bonds into a mass. The parts are heated in a protective atmosphere furnace to a high relative temperature below the melting point of the particular metal or alloy.

Repressing – This is the final pressing of a sintered metal part to obtain proper size and physical properties.

Infiltrating – This process fills the pores of a sintered metal part with a metal or alloy of a lower melting point.

Impregnation – This process fills the pores of a sintered metal part with a lubricant.

Heat Treating – This is the heating of a sintered metal part in a protective atmosphere and then oil quenching the part. The results are usually improved strength and hardness.

Machining – If required powdered metal parts can be machined to obtain the desired shape before or after heat-treating is completed.

How to improve wear resistance of powder metallurgy bearing?

Solution:

I. Vulcanization treatment of powder metallurgy products

(I) Intention of curing

When vulcanization treatment is used as antifriction data in powder metallurgy products, iron base oil-bearing is most widely used. Sintered bearing containing oil (graphite content 1%-4%) Du lining is simple in technique and low in cost. It can be used to replace bronze and Babbit alloy friction reduction data under PV < 18 ~ 25 kg · m/cm 2· s. However, under the working conditions of heavy solid lubricated bearing, if the sliding speed on the surface of conflict is too high and the unit load is too large, the wear resistance function and life of sintered parts will be reduced rapidly. In order to improve the anti-friction function of porous fe-base anti-friction parts, reduce the conflict coefficient and improve the operating temperature to expand its application range, the vulcanization treatment is a method worthy of implementation.

Sulfur and most sulfides have the certain smooth function of powder metallurgy bearing. Iron sulfide is an outstanding solid smoothening agent, especially in the dry conflict conditions, the presence of iron sulfide, with excellent anti-bite properties.

Powder metallurgy iron - based products, using its wool pores can be impregnated with a considerable amount of sulfur, after heating can make sulfur and pore surface of iron to form iron sulfide, it evenly distributed in the finished products everywhere, on the appearance of conflict has an outstanding smooth effect, and can improve the cutting function. The conflict and cutting appearance of the finished product after vulcanization treatment are very smooth.

After vulcanization treatment, the most outstanding effect of porous sintered iron is its excellent dry conflict function. It is a satisfactory self-smoothing data under oil-free smooth operating conditions (i.e., no refueling or no refueling) and has excellent bite resistance, reducing the sight of gnawing axis. In addition, the conflicting characteristics of the data are different from those of the usual anti-friction data. Usually, the data is added with the specific pressure, and the conflict coefficient starts to change little. When the specific pressure exceeds a certain value, the conflict coefficient increases sharply. After vulcanization treatment, the conflict coefficient of porous sintered iron decreases with the addition of specific pressure in a large range. This is a valuable characteristic of anti-friction data.

The vulcanized sintered iron - based oil-bearing can operate smoothly below 250℃.

(ii) Vulcanization treatment technology

The curing treatment technology is relatively simple and does not require special equipment. The technology is as follows:

Put the sulfur into the crucible and heat it to melt. When the temperature is controlled at 120 ~ 130℃, the sulfur has good fluidity at the moment. If the temperature is too high, it is not conducive to macerating. Preheat the sintered finished products that need to be impregnated to 100 ~ 150℃ first, then immerse the finished products in the molten sulfur solution for 3 ~ 20 minutes, and soak the unpreheated finished products for 25 ~ 30 minutes. The time of impregnation is determined by the density, wall thickness and amount of immersion required. Low density, wall thickness of the immersion time can be less; And vice versa. After soaking, remove the finished product and drain away the remaining sulfur. Finally, the soaked finished product will be put into the furnace, hydrogen maintenance, also can be maintained with charcoal, heating to 700 ~ 720℃ heat preservation 0.5 ~ 1 hour, at this moment, the immersed sulfur and iron effect to form iron sulfide. For the finished product with a density of 6 ~ 6.2g/cm 3, the sulfur intake was about 35 ~ 4% (component percentage). The purpose of the roasting is to form iron sulfide from the sulfur that is immersed in the pores of the part.

After vulcanization treatment, the sintered product can be treated with oil immersion and finishing.

(3) Examples of application of curing treatment

The shaft sleeve is installed at both ends of two rollers, a total of four sleeves. The roll pressure is 280 kg and the rotation speed is 700 ~ 1000 RPM (P=10 kg/cm 2, V=2 m/s). The original choice of tin bronze shaft sleeve, with oil swing ring smooth. Now the porous sintered iron with a density of 5.8g/cm 3 and S content of 6.8% is used instead. Instead of the original smooth device, a few drops of oil are needed before starting the machine. The shaft sleeve temperature is only about 40℃ after 40 hours of continuous operation. The shaft sleeve is still in normal operation.

The cone drill is an important thing in oil drilling. The cone drill has a sliding shaft sleeve on the top of the cone drill, which is subject to great pressure (pressure P=500 kg force/cm 2, speed V=0.15 m/s), and has intense sensation and impact.

Ii. Oil immersion treatment of powder metallurgy products

Powder metallurgy porous antifriction finished product immersion oil is an important process, can add the corrosion resistance of powder metallurgy finished product, improve the wear resistance, extend its use life. When the shaft rolls, the smooth oil will enter into the pores of the finished product. When the shaft rolls, it will have dynamic conflict with the sleeve and generate heat, so that the bearing temperature will rise. When the oil expands in heat, it will flow out of the pores to the shaft and the shaft sleeve to provide active oil, forming a smooth oil film and reducing friction. Immersion also prevents oxidation of the finished product.

The oil method can be divided into normal immersion oil, heating immersion oil and vacuum immersion oil.

Usually immersion oil: The clean sintered product is soaked in the oil (usually 20 ~ 30 oil). The oil is immersed into the pores of the finished product under the effect of capillary forces. This method of oil immersion power low, long immersion time, a few hours, used in the oil content is not high in the finished product.

Heat immersion oil: soak the cleaned sintered product in hot oil at 80 ~ 120℃ for 1 hour. As the finished product is heated, the air in the connected pores expands, causing some of the air to be swept away. As it cools, the remaining air shortens, drawing the oil into the pores. Because the hot oil is fluid and smooth, more oil can be soaked into the finished product. The power of this method is higher than the usual immersion rate.

Vacuum oil immersion: the finished sintered product is put into the vacuum chamber, sealed until -720mm Hg, and then the oil is put into the vacuum chamber, and then heated to 80℃ for 20 ~ 30 minutes. Because air is pumped out of the connected pores of the finished product, the oil can be immersed in the finished product in less than 10 minutes. This method of immersion oil has high power and high speed.

Another method of this method is to extract the air from the vacuum chamber where the finished product is placed, and then pass the preheated oil into the vacuum chamber to cover up the finished product, and then connect the vacuum chamber with the atmosphere, so that the oil can be quickly immersed into the pore of the finished product.

Third, waxed

Generally, the finished products of POWDER metallurgy are porous and have a large touch interface with air, which is prone to rust scene. Especially in the rainy coastal area, the corrosion of finished products is more serious due to high air humidity. In some cases, not only the outer surface of the finished product is corroded, but also the outer surface of the internal connected pores is also corroded, which seriously affects its service function and even leads to its scrap.

In order to avoid and reduce the corrosion of iron - based products, it is necessary to coat the product with wax after immersion in oil to prevent the finished product from being touched by the outside world. In this way, the finished product in long-distance transportation or a longer period of retention (according to the regulations, the finished product shall not rust within six months), will not rust.

The wax coating technology of powder metallurgy finished products is to put the wax into the wax cylinder, heat to 60 ~ 80℃, melt the wax, the finished products will be immersed in the wax liquid, and immediately take out, that is, on the surface of the finished products coated with a layer of uniform wax, cool before packaging.

Wax liquid is composed of white wax and vaseline, according to the season there are different proportions. The purpose of adding vaseline is to improve the fastness of the dried wax without cracking. When the air temperature is high, vaseline can be added less, and when the air temperature is low, the ratio of vaseline can be improved appropriately. Usually use vaseline 20%, white wax 80%.

Four, packaging

Appropriate packaging is to ensure that powder metallurgy products are not damaged or transformed during storage and transportation. It is the final process in the production of powder metallurgy. If packing is bad, can cause the loss of final goods, ought to say to be very regretful.

The way of packing is: the finished products coated with wax, to rustproof paper packaging, a number of good package into a box, each box should be put on the certificate and operation manual. Name and address of the factory, name of commodity, type and quantity, commodity scale and standard are marked on the outside of the box. Must not be different standard types of goods misshipment and mixed shipment. Then put some boxes into a box. It is necessary to put moistureproof paper around the boxes. The weight of each box should not exceed 50kg. Name and address of the factory, name of commodity, type, standard and quantity shall be marked on the outside. The packing date should be marked and the final sign "handle with care and keep away from moisture" should be affixed.