Bearings for rolling mills must withstand heavy loads and high-speed rotations as well as very severe operating environments. In various industries, they are used under severe conditions in every respect. Tedin produces double row tapered roller bearings, four-row tapered roller bearings, and four-row cylindrical roller bearings used for hot strip mills and cold strip mills, and Z-mill (Sendzmir mill).
What Is Bearings For Rolling Mills?
Bearings for Rolling Mills are specialized rolling element bearings designed to withstand heavy loads and high temperatures in rolling mill applications. Rolling mills are used in various industries such as steel, aluminum, and paper, where they are responsible for shaping and forming metal or other materials into desired shapes or thicknesses. These mills require bearings that can handle the extreme forces and operating conditions encountered during the rolling process.Bearings for Rolling Mills are designed to support the rolls and other rotating components of the mill, allowing them to rotate smoothly and withstand the heavy loads generated during the rolling process. These bearings are subjected to high radial and axial loads, as well as high temperatures due to friction and the heat generated during the rolling operation.The main types of bearings used in rolling mills include cylindrical roller bearings, tapered roller bearings, and spherical roller bearings. Cylindrical roller bearings have high radial load capacity and are suitable for applications with high radial loads. Tapered roller bearings can handle both radial and axial loads and are commonly used in pairs or sets to support the rolls. Spherical roller bearings are designed to accommodate misalignment and can handle heavy radial and axial loads.Bearings for Rolling Mills are typically lubricated with oil or grease, depending on the specific application requirements and operating conditions. Proper lubrication is crucial to reduce friction, dissipate heat, and prevent premature wear and failure of the bearings.
The roller and the raceway are in line contact or repaired offline contact, with large radial bearing capacity, suitable for bearing heavy loads and impact loads.
The friction coefficient is small, suitable for high speed, and the limit speed is close to the deep groove ball bearing.
It can move axially, can adapt to the change of the relative position between the shaft and the housing caused by thermal expansion or installation error, and can be used as a free end support.
The processing requirements for the shaft or the seat hole are relatively high, and the relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.
The inner ring or outer ring can be separated for easy installation and disassembly.
Steel stamping cage, for high-speed bearings or bearings that require a stable operation, use solid cages. According to the use occasions and user requirements, cages made of glass fiber reinforced plastic can also be designed and provided.
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Four Row Tapered Roller Bearing M283449D-410-410DInch size four-row tapered roller bearing:. Type Code: M283449D-410-410D . Dimensions: 730.25x1035.05x755.65mm; . Precision Grade: Class P5;. Material: Case-hardened Steel G20Cr2Ni4Aread more -
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Four Row Tapered Roller Bearing LM772749D-710-710DInch size four-row tapered roller bearing:. Type Code:LM772749D-710-710D . Dimensions: 489.026x634.873x320.675mm; . Precision Grade: Class P5; . Material: Case-hardened Steel G20Cr2Ni4Aread more -
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Bearings For Rolling MillsTedin's rolling mill bearings mainly include:. double row tapered roller bearings (TDI type and TDO type), . four-row tapered roller bearings, . and four-row cylindrical roller bearings.read more -
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Bearings for Backup RollsBackup roll bearing 12DC14110 and 18DC26125 are two types of cylindrical roller bearings with thick-walled outer ring, used for KT 12-high mill. 12DC14110 is three row cylindrical roller bearing withread more
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Types of Bearings For Rolling Mills
Spherical Roller Bearings
The rolling mill bearing configuration mainly uses two sets of spherical roller bearings installed side by side on the same roll neck. This configuration basically met the production conditions at that time, and the rolling speed could reach 600rpm. However, as the speed increases, its shortcomings become and prominent: short bearing life, large consumption, low precision of finished products, serious wear of the roll neck, large axial movement of the roll, etc.
2 Spherical Roller Bearings
Four-row cylindrical roller bearing + thrust bearing
Cylindrical roller bearings adopt a tight fit between the inner diameter and the roll neck to withstand radial force. They have the advantages of large load capacity, high limit speed, high precision, separable and interchangeable inner and outer rings, easy processing, low production cost, and convenient installation and disassembly. ; The thrust bearing bears the axial force, and the specific structural type can be selected according to the characteristics of the rolling mill.
Rolling Mill Bearings
Under heavy load and low speed, thrust roller bearings are equipped to bear the thrust load with small axial clearance. When the rolling speed is high, equipped with angular contact ball bearings, not only the limit speed is high, but the axial clearance can be strictly controlled during operation. The rollers are tightly guided in the axial direction and can withstand general axial load forces. This type of bearing configuration not only has long bearing life and high reliability, but also has many advantages such as high precision of rolled products and easy control. Therefore, it is currently the most widely used and is mostly used in wire rod mills, plate mills, foil mills, and double support rolls. Support rolls for cold rolling mills and hot rolling mills, etc.
4 Four-row Tapered Roller Bearings
The tapered roller bearing can bear both radial force and axial force. There is no need to configure a thrust bearing, so the main engine is compact. The inner diameter of the tapered roller bearing and the roll neck adopt a loose fit, which is very convenient to install and disassemble. However, sometimes the loose fit may cause sliding creep, so the inner diameter is often machined with a spiral oil groove. This configuration type is still widely used, such as the work rolls of four-high hot rolling mills and cold rolling mills, blanking machines, steel beam rolling mills, etc.
Four Row Tapered Roller Bearings
Four-row cylindrical roller bearings and six-row cylindrical roller bearings are almost exclusively used in the roll necks, drums and rolling presses of rolling stands. These bearings have low friction compared to other roller bearings. Because these bearings are typically mounted with an interference fit on the roll neck, they are particularly suitable for rolling mill applications where rolling speeds are high. The low cross-section of these bearings allows the use of relatively large roll neck diameters compared to the roll diameter. Due to the large number of rollers that can be installed, the radial load capacity is very high.
Application of Bearings For Rolling Mills
Steel industry
Rolling mill bearings are essential components in the steel industry. Most rolling mills in steel production require bearings. In steel production, conveyor belts, roller tables and other places require the support of rolling mill bearings to ensure that the steel coils do not deform irregularly. Some high-purity and high-quality steel plates also require the performance and precision of rolling mill bearings to reach very high standards.
Non-ferrous metal industry
Rolling mill bearings are also often used in non-ferrous metal production. Cast alloys containing different compositions and properties must be processed and rolled on different rolling mills, which requires rolling mill bearings to have high precision, high load capacity, and good fatigue resistance.
Foundry industry
In the casting industry production, rolling mill bearings also have very important applications. In the foundry industry, common casting machines, pouring machines and other equipment require the use of rolling mill bearings. Due to the harsh production environment of casting equipment, the materials and manufacturing processes of rolling mill bearings also need to reach a higher level.
Shipbuilding industry
Applications for rolling mill bearings also include the shipbuilding industry. In the shipbuilding industry, bearings are key components for operating control equipment and ensuring their normal operation. In addition, bearings are also used in anchors and safety tool fixings on ships.
Outer Ring
The outer ring is the outermost component of the bearing and provides support and protection to the internal components. It is usually made of high-quality steel and is designed to withstand heavy loads and high temperatures.
Inner Ring
The inner ring is the innermost component of the bearing and provides the raceway for the rolling elements. It's also made from high-quality steel and precision machined to ensure proper fit and alignment with the rolling elements.
Rolling Element
The rolling elements are the load-bearing parts of the bearing. In rolling mill bearings, the most common rolling element types are cylindrical, tapered or spherical rollers. These elements roll between the inner and outer rings, distributing loads and reducing friction.
Cage
A cage, also called a cage or separator, is a component that holds the rolling elements in place and maintains their proper spacing. The cage prevents the rolling elements from contacting each other, reducing friction and wear. It is usually made of steel, brass or synthetic materials.
Seals/Guards
Rolling mill bearings may be equipped with seals or guards to protect them from contamination by water, scale, dust and other debris. Seals, usually made of rubber or synthetic materials, provide a barrier between the inside of the bearing and the outside environment. Guards, on the other hand, are metal plates that provide partial protection while allowing some lubrication to reach the rolling elements.
Lubricating
Lubrication is a critical component of rolling mill bearings. It ensures smooth operation, reduces friction and wear, and dissipates the heat generated during the rolling process. Rolling mill bearings can be lubricated with oil or grease, depending on the specific application requirements and operating conditions.
Installing and removing components
Rolling mill bearings may include mounting and dismounting components such as adapter sleeves, withdrawal sleeves or hydraulic nuts. These components facilitate the installation and removal of bearings on the rolling mill.
Material of Bearings For Rolling Mills
High Carbon Chromium Steel Bearings
High carbon chromium steel bearings are one of the most widely used bearing materials. Its main features are high hardness, wear resistance, strong corrosion resistance, high strength and long fatigue life. At the same time, the manufacturing process of high-carbon chromium steel bearings is relatively mature and the price is relatively affordable. Therefore, some traditional large-scale rolling mill equipment still uses high-carbon chromium steel bearings.
Aluminum Alloy Bearings
Aluminum alloy bearings are a relatively new choice for rolling mill bearing materials. Its main features are low density, high strength and moderate hardness. At the same time, the manufacturing cost of aluminum alloy bearings is relatively low, which can better meet the needs of modern production equipment for lightweight bearing materials. In addition, aluminum alloy bearings are more in line with environmental protection requirements and have broad application prospects.
Ceramic Bearings
Ceramic bearings are one of the representatives of new materials in recent years. Its main advantages are low density, high strength, extremely high hardness, and good wear resistance, corrosion resistance and high temperature resistance. Suitable for use in special high temperature, high pressure and corrosive environments. Therefore, ceramic bearings have broad application prospects in some special rolling mill equipment, aerospace, shipbuilding and other fields.
Lubrication of Rolling Mill Bearings
Grease lubrication also has a sealing effect. The sealing structure and lubrication facilities are simple, and grease replenishment is convenient. Therefore, as long as the working conditions permit, rolling bearings are generally lubricated with grease. Oil lubrication has a strong cooling effect and can remove dirt and moisture from the bearings. The lubrication methods of oil-lubricated roller bearings include pressure oil lubrication, oil spray lubrication, oil mist lubrication and oil-air lubrication.
Pressure oil supply lubrication is the most effective lubrication method for rolling bearings at normal speed. Oil injection lubrication is to spray lubricating oil into the inside of the bearing with a certain pressure through an oil injection nozzle installed on one side of the bearing for lubrication. Generally used in situations where high-speed roller bearings or pressure oil supply lubrication cannot meet cooling requirements.
Spray lubrication is to spray dry compressed air containing oil mist into the inside of the bearing for lubrication. The amount of oil used is minimal. Due to the action of air, the cooling effect is extremely strong. It is mainly used in large rolling mills with high rolling speed and high rolling precision requirements. Roller bearings, or roller bearings used in bearing housings that are not frequently disassembled. Both pressure oil supply lubrication and oil injection lubrication require the installation of oil inlet and outlet pipes, lubrication pumps, oil reservoirs, and sometimes lubricating oil coolers. Therefore, the cost is relatively high, and generally roller bearings are rarely used.
What Is the Working Principle of an Bearings For Rolling Mills
The working principle of bearings refers to mechanical elements that establish support and reduce friction between two relatively moving parts. The working principle of bearings is based on the principles of lubrication and rolling! Sliding friction. It usually consists of two main components: the inner ring and the outer ring, and the contact between them is through rolling elements (such as steel balls or rollers). The main principles of axial water I. operation are as follows
Grease Lubrication
The inside of the bearing is usually filled with appropriate lubricant (such as grease) to reduce friction and wear. Lubricant can form a thin lubricating film within the bearing, allowing the rolling elements to roll on the contact surface instead of sliding, thereby reducing energy loss and heat generated by friction.
Rolling Friction
The rolling elements (such as steel balls) in the bearing support and transmit linear or rotational motion by rolling rather than sliding. Rolling friction is smaller than sliding friction, thus reducing energy loss and wear.
Axial Support
Bearings also have the function of axial support and can withstand forces and moments perpendicular to the axial direction. This allows the bearing to stably support and position rotating or reciprocating parts.
Adjust The Clearance
Part of the clearance in the bearing can be used to adjust the assembly clearance between the shaft and the seat. This can adapt to parts of different sizes within a certain range and ensure proper matching of the shaft and seat to achieve good operating results.
How to Choose the Bearings For Rolling Mills Correctly
Product structure
Rolling mill bearings usually include rolling bearings and sliding bearings. Rolling bearings generally consist of inner rings, outer rings, rolling elements and cages. They have the advantages of high precision, high speed, low friction, etc. Sliding bearings reduce friction by forming an oil film on the bearing surface, and have the ability to withstand larger loads, adapt to impact loads, and withstand high temperatures.
Product selection
When selecting rolling mill bearings, comprehensive considerations need to be based on actual working conditions and usage requirements. First of all, it is necessary to determine the size and type of the bearing, and select the appropriate bearing model based on the structural characteristics of the rolling mill equipment, the requirements of the transmission system, and the size of the bearing seat. Secondly, the load-bearing capacity and rotation speed of the bearing must be considered, and the appropriate bearing material and accuracy level must be selected based on the process requirements and actual operating conditions of the rolling mill equipment.
Product advantages
Rolling mill bearings have the advantages of high precision, high speed, and low friction. They also have a strong load-bearing capacity and can accommodate shock loads and withstand high temperatures. Sliding bearings have the ability to carry larger loads, adapt to impact loads and withstand high temperatures. They also have a low coefficient of friction, ensuring rolling mill stability and efficiency.
Usage scenarios
Rolling mill bearings are mainly used in the transmission system of rolling mill equipment as support and positioning bushings. When selecting rolling mill bearings, comprehensive considerations need to be based on actual working conditions and usage requirements, including bearing size and type, load-bearing capacity and speed, usage environment, maintenance requirements and other factors. At the same time, the bearing seat size and fit tolerance need to be considered to ensure the stability of the bearing installation and reliability of use.
Storage and storage of Rolling Mill bearing. The inner and outer ring components of the bearing should be wrapped in plastic, and the packaging design of the bearing should meet the moisture-proof and dust-proof requirements of the bearing.
In order to prevent the elliptical deformation of the inner and outer rings, the roller bearing should be kept horizontally, and the bearing should be stored in the original packing box and placed in a dry place. In dusty, wet environments, bearings are not allowed to be removed from packaging and placed on pallets or open shelves.
All bearing mounting components should be clean and in good condition. Workbenches and mounting areas should be kept clean. Bearing components should not be mounted next to welding areas and machining equipment to prevent debris and dirt from entering the bearings.
Treatment of roll bearings before and after use. When the new rolls are transported into the factory, pay attention to prevent bumps. After inspection and approval from the relevant departments, the new rolls are numbered before use, installed in sequence, and auxiliary parts such as bearing inner sleeves and sealing end caps are installed at the head end.
General installation method: heat the inner sleeve of the bearing to 150% to 200% with oil or electric heater, and install it on the roll neck while hot after the inner sleeve is expanded. In order to delay fatigue damage and prevent various failures and accidents during operation, it should be checked in time and properly maintained. Institutionalization is formed to ensure that the bearings operate well during the service period.
How to Maintain a Rolling Mill: Essential Tips for Longevity and Performance
Clean And Lubricate Regularly
Regular cleaning and lubrication are basic maintenance measures for rolling mills. After each use, remove any debris, metal shavings, or dust from the rollers, guides, and gears. This can be done using a brush or compressed air. Also, lubricate moving parts, such as roller bearings and gears, according to the manufacturer's recommendations. Proper lubrication ensures smooth operation and minimizes friction, thereby reducing wear and tear on mill components.
Check And Replace Worn Parts
Regular inspections are essential to identify any worn or damaged components that may affect the performance of the rolling mill. Check rollers, guides, and other components for signs of wear, such as cracks or uneven surfaces. If you notice any problems, replace worn parts immediately to prevent further damage. Regular inspection and replacement of worn parts ensures smooth operation of the plant and consistent output quality.
Check Alignment And Leveling
Proper alignment and leveling are critical to accurate and efficient operation of a rolling mill. Periodically check the alignment of the rollers and rails to make sure they are parallel and properly adjusted. Roller misalignment can result in uneven material thickness and poor output quality. Use a leveling tool to check that the grinder is in the correct position and make any necessary adjustments to ensure it is level. Proper alignment and leveling promotes uniformity in the rolling process and prevents unnecessary stress on mill components.
Maintain Electrical And Control Systems
If your rolling mill is equipped with electrical and control systems, it is important to incorporate them into your routine maintenance. Check and clean electrical connections regularly to make sure they are tight and free of corrosion. Check the control panel and switches for any signs of faulty or loose wiring. If you notice any electrical problems, consult a qualified electrician for immediate resolution. Proper maintenance of electrical and control systems helps ensure safe and reliable operation of the rolling mill.
Implement A Preventive Maintenance Plan
To simplify maintenance and ensure consistency, develop a preventive maintenance plan for your rolling mill. Create daily, weekly, monthly and yearly to-do lists. This may include cleaning, lubrication, inspection and calibration procedures. Assign responsibilities to specific individuals or teams and track the completion of each task. By following a preventive maintenance schedule, you can proactively address potential issues before they escalate, minimizing downtime and maximizing the life of your rolling mill.
Train Operators And Users
The correct operation of a rolling mill plays a vital role in its maintenance and service life. Make sure operators and users are trained to operate and handle the mill properly. Educate them on safety precautions, proper feeding techniques and maintenance protocols. Operators are encouraged to report any unusual sound, vibration, or performance issues immediately. Well-trained operators contribute to the efficient operation of the rolling mill and help identify maintenance needs in a timely manner.
Our Factroy
LUOYANG TEDIN BEARING CO., LTD. --owns core production technology of high-end rolling bearings, focusing on R & D high-end bearings, customized bearings, and specially designed precision bearings have been in a leading position of China.
TEDIN has a variety of automatic producing lines and supporting facilities for high-precision roller bearings. The precision grade of the precision bearings can reach P5, P4, P2. TEDIN serves a wide range of customers especially in precision machine tools, rolling mills, precision rotary tables, industrial robots, high-speed railway, track traffic, military Radar, helicopter gunship, wind power, and solar energy, etc.
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