Materials And Applications Of Bimetal Bearings

- Dec 26, 2020-

Bimetal bearing is a kind of oil-free lubrication bearing. It is based on high-quality low-carbon steel back and sintered with lead-tin bronze alloy on the surface. After several times of high-temperature sintering and dense rolling, a bimetallic strip of copper and steel is formed. Rolled, suitable for a variety of applications such as bushings and thrust washers that bear medium-speed and high-impact loads.


The balance axle bushings of heavy-duty vehicles all use bimetallic bearings, which is a kind of high-load and low-speed motion bearing with wide application. In the high sliding performance, it has particularly good self-lubricating performance in the absence of lubricating medium and water as the medium. It is suitable for bimetal casting materials, corrosion-resistant bearings with high sliding speed, and bearings for crushers, water pumps, and cold rolling mills. Piston pin sleeves with loads up to 70MPa.


The product has the advantages of good wear resistance. Especially suitable for medium speed, medium load and low speed and high load. Through special technological means, various oil grooves, oil pockets and oil holes can be processed on the friction surface to adapt to the use under different lubrication conditions.


Metal-based inlaid solid self-lubricating bearing (JDB) is a novel lubricating bearing that combines the characteristics of metal bearing and self-lubricating bearing. The metal matrix bears the load, and the specially formulated solid lubricating material plays the role of lubrication. It has the characteristics of high bearing capacity, impact resistance, high temperature resistance, and strong self-lubricating ability. It is especially suitable for heavy loads, low speeds, reciprocating or swinging situations that are difficult to lubricate and form an oil film, and are not afraid of water wash and other acid erosion. And scour.


The products have been widely used in automobile engines, chassis, motorcycle clutches, gear pump wipers and lifting equipment.


Mainly widely used in heavy-duty vehicle balance bridge bushings, gaskets, automobile steel plate bushings, internal combustion engine main bushes, connecting rod bushings, rocker arm bushings, oil pump side friction plates, medium and small power internal combustion engine bearings, train engine bearings, air Press sleeves, refrigerators, etc.


Since the base body is stable of low-carbon steel material, the machining accuracy of the outer diameter of the sleeve is guaranteed, and the product does not need to be fixed by screws after the product is installed in the seat hole. The interference fit can prevent the outer circle phenomenon. The change of the chemical composition of the inner surface alloy layer can meet the requirements of different bearing pressures, different use temperatures, and different sliding speeds. The friction surface is designed with different structures of oil grooves and oil pockets in production to meet the requirements of different refueling methods and prevent biting. Axis phenomenon.


Material of bimetal bearing


Substrate material: low carbon steel, the outer surface can be plated with copper or tin with corrosion-resistant layer.


Inner wall copper layer: The inner wall copper layer is made of CuSn6Zn6Pb3 or CuSn6.5P0.1 tin bronze and CuPb10Sn10 or CuPb24Sn two lead bronzes. There are four types of copper layers and ALSn20Cu high tin aluminum alloy layers. Customers can choose the applicable ones. Copper layer material.


The standard thickness of the alloy layer is 0.25mm-0.3mm, and the alloy layer of any non-standard thickness can also be sintered according to customer requirements.


Inner wall material performance:


CuPb24Sn4: It has high fatigue strength, bearing capacity, and impact resistance. However, due to the high content of lead in the alloy and the large specific gravity, it is easy to produce lead segregation, which reduces the wear resistance of the shaft sleeve and also makes the alloy layer and steel The bonding strength of the back is reduced, and the cost of this copper layer is higher. It is used for bearings under high speed, swing and rotation conditions.


CuPb10Sn10: has high fatigue strength and load capacity, good lubrication performance, wear resistance and corrosion resistance, suitable for medium load, medium to high speed and large impact load bearings, coils used in mechanical equipment For bearings, sliding bearings with high surface pressure of washers and side pressure, such as rolling bearings, vehicle bearings, bimetallic bearings, piston pin sleeves, friction plates, etc.


CuSn6Zn6Pb3: Good wear resistance and corrosion resistance, easy to process, good casting performance and airtightness, wear and corrosion resistant parts that work under normal load and medium sliding speed, such as turbines, motors, compressors, piston clutches , Connecting rod bushings, rocker bushings, etc., currently used in larger quantities.


CuSn6.5-0.1: Lead-free bimetallic bearings, mainly widely used in heavy-duty vehicle balance bridge bushings, gaskets, internal combustion engine main bushes, connecting rod bushings, rocker bushings, oil pump side friction plates, small and medium power internal combustion engines Bearings, train engine bearings, air compressor bushings, refrigerators, etc.


ALSn20Cu: Has medium fatigue strength and load-bearing capacity, good corrosion resistance and sliding properties. It can be used with flexible shafts, and is often used as medium and small power internal combustion engine bearings, train engine bearings, air compressor sleeves, etc. It is the best product to replace Babbitt alloy.