NewBee Machinery is a professional machinery parts manufacturer providing high quality precision bearings, high-quality non-standard transmission components, and intelligent CNC equipment and more.
NewBee Machinery is a professional machinery parts manufacturer providing high quality precision bearings, high-quality non-standard transmission components, and intelligent CNC equipment and more.
A Rolling Mill Support Bearing is a high-load-carrying, high-stability rolling bearing specifically designed for backup rolls of rolling mills. It mainly adopts a four-row cylindrical roller structure, with rings and rollers made of ultra-pure bearing steel (AISI 52100 or 42CrMo). After integral quenching and ultra-precision grinding, the raceway hardness reaches HRC 60-62, enabling it to stably withstand heavy radial loads (up to 5000 kN) and alternating impact loads under operating conditions of 1000-2000 rpm. It also has excellent resistance to scale contamination and temperature rise, serving as a core component of the backup roll system in hot and cold rolling production lines of steel enterprises (e.g., wide and heavy plate, strip rolling). It is also one of the categories of steel mill bearings with the strictest requirements for "load-bearing strength + working condition adaptability".
As a professional roller mill manufacturer and a technical benchmark enterprise in the rolling mill bearings field, NEWBEE Transmission’s Rolling Mill Support Bearing, relying on the "four-row roller logarithmic crown + split outer ring" design, has a contact stress 30% lower than that of ordinary rolling mill bearings under the same load. Moreover, the radial runout of the backup roll is controlled within ≤0.01 mm, significantly improving the thickness uniformity of rolled materials, fully demonstrating the ultimate breakthrough of roller mill manufacturers in the heavy-load performance of steel mill bearings.
<!--[if !supportLists]-->1. <!--[endif]-->Superior Radial Load-Carrying and Impact Resistance: Rolling Mill Support Bearings adopt a symmetric layout of four-row cylindrical rollers, combined with a widened raceway design (raceway width 25% larger than that of ordinary bearings). The maximum rated dynamic radial load can reach 5000 kN (e.g., model RMSB-1200), which can meet the heavy-load requirements of backup rolls in wide and heavy plate rolling mills. NEWBEE Transmission optimizes the logarithmic crown curve of the rollers through finite element analysis, so that when the bearing bears an instantaneous impact of 1.5 times the rated load (e.g., billet biting), the edge stress of the rollers is reduced by 40%, and the impact-resistant service life is increased by 50% compared with ordinary rolling mill bearings. As an experienced roller mill manufacturer, NEWBEE relies on imported German roll forming equipment to ensure that the dimensional consistency error of each row of rollers is ≤0.002 mm, realizing uniform load distribution among the four rows of rollers (distribution efficiency up to 95). It has become a core guarantee for the "stable load operation" of rolling mill backup rolls and sets a heavy-load performance benchmark in the field of steel mill bearings.
<!--[if !supportLists]-->2. <!--[endif]-->Adaptability to Harsh Working Conditions with Temperature and Contamination Resistance: Aiming at the harsh working conditions of rolling mills (especially hot rolling mills) such as high temperature (ambient temperature ≤200℃), heavy scale, and abundant cooling water, Rolling Mill Support Bearings adopt a combined solution of "ceramic coating + multi-layer seal" — the outer surface of the ring is sprayed with a Ni-Cr-Al-Y high-temperature resistant coating (thermal insulation coefficient increased by 35%), and the interior is equipped with a double-lip contact seal (IP66 protection level), which can effectively block scale and cooling water from entering the bearing. NEWBEE Transmission also customizes high-temperature polyurea grease (suitable for -30℃~220℃) for this bearing to avoid the failure of ordinary grease at high temperatures, solving the problem that traditional rolling mill bearings are prone to jamming in hot, humid, and dusty environments. In addition, the inner ring of the bearing is reserved with a dedicated lubrication channel, which, combined with a centralized high-pressure oil lubrication system (40 Bar pressure), can timely remove frictional heat, enabling the bearing to maintain more than 80% of its rated service life even under the working condition of 200℃. This fully reflects the in-depth optimization of roller mill manufacturers for the working condition adaptability of steel mill bearings.
<!--[if !supportLists]-->3. <!--[endif]-->Low Maintenance and Quick Overhaul Advantages: Rolling Mill Support Bearings adopt a split outer ring design, which allows on-site replacement of rollers and cages without disassembling the entire backup roll, shortening the overhaul time by 60% compared with ordinary rolling mill bearings. NEWBEE Transmission equips this bearing with a modular cage (brass or PA66 material optional), which can be replaced individually when damaged without scrapping the entire bearing, significantly reducing the operation and maintenance costs of steel enterprises. At the same time, the flanged outer ring design simplifies the axial fixing process — during installation, the outer ring only needs to be fixed to the bearing housing with bolts, and the coaxiality deviation can be controlled within ≤0.05 mm, avoiding precision loss caused by the complex installation of traditional bearings. This advantage is a key innovation of NEWBEE as a roller mill manufacturer to meet the "cost reduction and efficiency improvement" needs of steel mill bearings users and the core of the product’s market competitiveness.
<!--[if !supportLists]-->4. <!--[endif]-->Long Service Life and Rolled Material Precision Guarantee Performance: Relying on the high fatigue resistance of ultra-pure bearing steel (fatigue life L10 reaches 1500 hours) and NEWBEE Transmission’s "raceway ultra-finishing + surface phosphating" process, the service life of Rolling Mill Support Bearings is extended to 1.4 times that of ordinary rolling mill bearings, and the backup roll change cycle is increased by 40%. In addition, the high-precision cooperation of the four rows of rollers of the bearing controls the radial runout of the backup roll within ≤0.01 mm, thereby reducing the thickness tolerance of rolled materials to ±0.03 mm (e.g., cold-rolled strip), increasing the qualification rate of rolled materials by 12%-15% compared with those produced by ordinary steel mill bearings. As a core technical highlight of roller mill manufacturers, this feature makes NEWBEE’s Rolling Mill Support Bearings the preferred accessory for high-end rolled material production.
<!--[if !supportLists]-->5. <!--[endif]-->High Adaptability and Customization Capability: Rolling Mill Support Bearings cover a full specification range with inner diameters of 300-1200 mm and outer diameters of 500-1800 mm, adapting to different rolling mill types (e.g., four-high cold rolling mills, six-high hot rolling mills) with backup rolls of φ500-1800 mm. As a professional roller mill manufacturer, NEWBEE Transmission can customize bearing details according to the backup roll structure of the user’s rolling mill-for example, customizing "outer rings with positioning steps" (axial positioning accuracy increased by 30%) for wide and heavy plate rolling mills, and customizing "corrosion-resistant stainless steel inner rings" (adapting to acid-containing cooling water environments) for cold rolling mills. It also supports customization of special lubrication interfaces and seal structures, further expanding the application boundary of rolling mill bearings to meet the personalized needs of different steel plants.
With the advantages of high load-carrying capacity and high stability, Rolling Mill Support Bearings, as the core recommended products of roller mill manufacturers, are widely used in the backup roll scenarios of steel mill bearings and are key guarantees for rolled material precision and production efficiency:
Backup Rolls of Hot Rolling Wide and Heavy Plate Mills: Suitable for rolling wide and heavy plates with a thickness of 20-100 mm, NEWBEE Transmission’s Rolling Mill Support Bearing (model RMSB-1000) can bear a radial load of 4500 kN under the working condition of 1500 rpm. Combined with high-temperature grease and IP66 seals, it can effectively resist the heat conduction from 900-1100℃ rolled pieces and scale contamination during hot rolling. As a core component of steel mill bearings, this bearing has become the standard configuration for backup roll systems of major domestic wide and heavy plate mills (e.g., Baowu, Angang), extending the service life of backup rolls to 180 days compared with ordinary rolling mill bearings and reducing the number of shutdowns for roll changes.
Backup Rolls of Cold Rolling Strip Mills: Used for rolling cold-rolled strips with a thickness of 0.1-3 mm, high-precision Rolling Mill Support Bearings (P5 grade accuracy) are selected, with a radial runout of ≤0.008 mm. Combined with the uniform load distribution of four rows of rollers, it ensures the synchronous operation of backup rolls and work rolls, controlling the thickness tolerance of cold-rolled strips within ±0.02 mm and the surface finish up to Ra ≤0.8 μm. The corrosion-resistant inner ring (sprayed with CrN coating) customized by NEWBEE Transmission for this scenario can resist the erosion of acid-containing cooling water in cold rolling, and the bearing service life remains above 1200 hours even in humid environments, which is much higher than the 800-hour standard of ordinary rolling mill bearings.
Backup Rolls of Special Rolling Mills: Suitable for backup rolls of special rolling mills for non-ferrous metals such as copper and aluminum, NEWBEE Transmission can provide customized solutions - for example, selecting low-friction PA66 cages (friction coefficient reduced by 20%) for the rolling needs of soft non-ferrous metal materials to avoid scratching the rolled material surface during backup roll operation; adopting P4 grade Rolling Mill Support Bearings (radial runout ≤0.005 mm) for high-precision aluminum foil rolling mills to ensure the thickness uniformity of aluminum foil. Such customized products enable rolling mill bearings to more accurately match the needs of special rolling mills and also reflect the scenario-specific service capabilities of roller mill manufacturers.
Backup Rolls of Reversible Rolling Mills: Used for backup rolls of reversible hot and cold rolling mills, Rolling Mill Support Bearings need to adapt to the working conditions of alternating forward and reverse rotation and frequent start-stop. By optimizing the contact precision between rollers and raceways (contact area increased by 15%), NEWBEE Transmission controls the impact vibration of the bearing during forward-reverse rotation switching within ≤3 mm/s, which is 40% lower than that of ordinary steel mill bearings, ensuring stable rolling of reversible rolling mills and reducing the scrap rate of rolled material heads and tails.
The price of Rolling Mill Support Bearings is affected by multiple technical and customization requirements. As a professional roller mill manufacturer, NEWBEE Transmission can provide a transparent and accurate quotation plan to help users reasonably control the procurement cost of steel mill bearings:
<!--[if !supportLists]-->1. <!--[endif]-->Material Selection: The price of Rolling Mill Support Bearings made of standard ultra-pure bearing steel (AISI 52100) is 18%-22% higher than that of products made of ordinary bearing steel. This is because AISI 52100, after integral quenching, has better fatigue resistance and wear resistance, which is more suitable for the heavy-load needs of steel mill bearings. If customization of 42CrMo alloy steel (temperature resistance ≤300℃) or stainless steel material (SUS440C) is needed to adapt to corrosive or high-temperature scenarios, the price will increase by another 25%-30%. When the cage is made of brass (suitable for high speeds above 2000 rpm), the price is 12%-15% higher than that of PA66 cages. This is a reasonable pricing strategy formulated by roller mill manufacturers based on material performance differences.
<!--[if !supportLists]-->2. <!--[endif]-->Precision Grade: Due to the strict raceway grinding precision requirements (tolerance ≤0.005 mm) and roller dimensional consistency error ≤0.002 mm, the price of P5 grade Rolling Mill Support Bearings is 20%-25% higher than that of P6 grade ones, which is suitable for scenarios with extremely high precision requirements such as cold-rolled strips and aluminum foil. For hot rolling wide and heavy plates, section steel rolling mills, P6 grade bearings are sufficient to meet the needs with higher cost-effectiveness. As a roller mill manufacturer, NEWBEE Transmission will recommend the appropriate precision according to the user’s rolling mill type (hot rolling/cold rolling) and rolled material precision requirements to avoid cost waste caused by excessive pursuit of high precision, which is also one of the core principles for quoting rolling mill bearings.
<!--[if !supportLists]-->3. <!--[endif]-->Specification and Size: The price of small and medium-sized Rolling Mill Support Bearings with an inner diameter of 300-600 mm (e.g., RMSB-600 with an inner diameter of 300 mm) is relatively affordable. For large-sized products with an inner diameter >800 mm or an outer diameter >1500 mm (e.g., RMSB-1200 with an inner diameter of 600 mm), due to the need for large vertical lathes and ultra-precision grinding equipment (e.g., German Schneeberger S40) for processing and a 40% longer processing cycle, the price increases stepwise with the size, with an increase rate of up to 40%-60%. Relying on large-scale production (monthly output of over 300 sets), NEWBEE Transmission can reduce the unit cost of large steel mill bearings by 10%-15%, providing users with more competitive quotations.
<!--[if !supportLists]-->4. <!--[endif]-->Customization Requirements: The price of products requiring additional configuration of high-temperature resistant coatings (Ni-Cr-Al-Y), IP66 protection level seals, or high-pressure lubrication interfaces will increase by 15%-22%. For non-standard backup roll sizes (e.g., special inner/outer diameters), the price will increase by 20%-28% due to the need for re-designing tooling and molds. For example, the price of the "RMSB bearing with axial positioning steps" (step height 15 mm) customized for a certain wide and heavy plate mill is 23% higher than that of the standard model due to structural optimization and process adjustment. For specific quotations, you can contact NEWBEE Transmission to obtain exclusive rolling mill bearings solutions.
<!--[if !supportLists]-->1. <!--[endif]-->Precise Size Matching: Rolling Mill Support Bearings have an inner diameter range of 300-1200 mm, an outer diameter range of 500-1800 mm, and a width range of 150-500 mm. When purchasing, it is necessary to accurately measure the journal size (inner diameter d) of the rolling mill backup roll, the bearing housing bore diameter (outer diameter D), and the installation width (B). Special attention should be paid to the fit tolerance between the backup roll and the bearing inner ring (H7/js6 is recommended) to avoid bearing "ring slipping" or "seizure" caused by size deviation. As a roller mill manufacturer, NEWBEE Transmission provides a full range of standard models (RMSB-300 to RMSB-1200) and non-standard customization services. It can ensure that rolling mill bearings perfectly match the equipment according to the backup roll drawings provided by the user, reducing assembly failures.
<!--[if !supportLists]-->2. <!--[endif]-->Working Condition Adaptation: For hot rolling scenarios (ambient temperature ≤200℃, heavy scale), Rolling Mill Support Bearings with high-temperature resistant coatings and IP66 seals should be selected, combined with high-temperature grease; for cold rolling scenarios (acid-containing cooling water, low speed), it is recommended to customize corrosion-resistant inner rings and low-friction cages; for non-ferrous metal rolling mills, stainless steel bearings are preferred to avoid contamination by non-ferrous metal oxide layers. As a professional roller mill manufacturer, NEWBEE Transmission can optimize the structure and configuration of rolling mill bearings according to the geographical location of the user’s steel plant and rolling mill type, avoiding premature bearing failure caused by improper environmental adaptation (e.g., the service life of ordinary bearings is reduced by 60% in hot rolling scenarios).
<!--[if !supportLists]-->3. <!--[endif]-->Precision Grade Adaptation: For the production of high-precision rolled materials such as cold-rolled strips and aluminum foil (thickness tolerance ≤±0.02 mm), P5 grade Rolling Mill Support Bearings should be selected to ensure that the radial runout of the backup roll is controlled within ≤0.008 mm; for scenarios with low precision requirements such as hot rolling wide and heavy plates and section steel (tolerance ±0.1 mm), P6 grade bearings are sufficient to balance performance and cost. NEWBEE Transmission can provide authoritative precision inspection reports (including radial runout and roller dimensional consistency data). As a roller mill manufacturer, it strictly controls the quality of steel mill bearings to ensure the precision consistency of each product.
<!--[if !supportLists]-->4. <!--[endif]-->Supplier Qualification Screening: It is advisable to choose roller mill manufacturers like NEWBEE Transmission that have a complete industrial chain of "material R&D - precision processing - finished product inspection". Such manufacturers can provide material spectrum analysis reports, load test data (holding pressure for 10 minutes under 1.2 times the rated load), and after-sales technical support (installation guidance, fault diagnosis) to avoid purchasing "three-no" products (no inspection report, no quality guarantee, no technical service). As a benchmark enterprise in the rolling mill bearings field, NEWBEE Transmission’s products have passed the dual certifications of ISO 9001 and ISO 14001. Each Rolling Mill Support Bearing is attached with a "quality traceability QR code", through which production and inspection records can be queried in real time.
<!--[if !supportLists]-->5. <!--[endif]-->Price Rationality Evaluation: When comparing quotations from different roller mill manufacturers, it is necessary to avoid "only focusing on low prices" and focus on the comprehensive ratio of "load-carrying capacity - service life - cost". For example, although the quotation of P5 grade bearings from a small factory is 15% lower than that of NEWBEE, their rated dynamic load is only 80% of that of NEWBEE’s products, requiring frequent replacement during long-term use, resulting in higher operation and maintenance costs. Relying on imported equipment (German Studer grinding machines) and large-scale production, NEWBEE Transmission can control the unit cost within a reasonable range while ensuring the quality of Rolling Mill Support Bearings. It also provides an 18-month warranty and lifelong technical consultation to reduce the user’s later risks.
NEWBEE Transmission is a professional manufacturer of Rolling Mill Support Bearings. As an experienced roller mill manufacturer and a technologically leading enterprise in the rolling mill bearings field, it has been deeply engaged in the steel mill bearings field for more than ten years. Its products cover a full specification range with inner diameters of 300-1200 mm, including 10 standard models from RMSB-300 (inner diameter 300 mm) to RMSB-1200 (inner diameter 600 mm). It can customize rolling mill bearings with special structures such as positioning steps, corrosion resistance, and enhanced seals according to user needs.
Relying on imported German ultra-precision grinding equipment (Studer S40), large vertical lathes (Schiess VDF), and fully automated assembly lines, the raceway tolerance of NEWBEE Transmission’s Rolling Mill Support Bearings is controlled within ±0.003 mm, the logarithmic crown curve error of the rollers is ≤0.001 mm, and the load distribution efficiency of the four rows of rollers reaches 95%. Combined with a strict quality control system (ISO 9001 + SGS certification), each bearing undergoes "heavy-load testing" (operating for 1 hour under 1.2 times the rated load to monitor temperature rise and deformation), "seal performance testing" (IP66 waterproof and dustproof verification), and "dynamic balancing testing" (G6.3 grade) to ensure that the delivered steel mill bearings are 100% up to standard.
In addition, NEWBEE Transmission has recently achieved a breakthrough in the field of "rolling mill bearing materials"-the developed nano-ceramic reinforced bearing steel (doped with Al₂O₃ nano-particles) has increased the fatigue life of Rolling Mill Support Bearings by another 20%, further consolidating its technical advantages as a roller mill manufacturer. At present, the products have been widely used in steel enterprises in more than 20 countries and regions around the world, serving well-known customers such as Baowu, Angang, and POSCO Korea, and have become a trusted rolling mill bearings supplier for customers. For detailed parameters (e.g., rated load, maximum speed), customization plans, or technical materials of Rolling Mill Support Bearings, you can contact the technical team of NEWBEE Transmission directly.
<!--[if !supportLists]-->1. <!--[endif]-->Standard Installation Operation: When installing Rolling Mill Support Bearings, a special hydraulic installation tool (oil pressure ≤100 Bar) should be used to install the inner ring onto the backup roll journal with an interference fit to avoid raceway damage caused by knocking the rings. Wear-resistant grease (NEWBEE’s special model NB-GR90 is recommended) should be applied to the fit between the bearing outer ring and the bearing housing to ensure smooth assembly. After installation, the coaxiality (deviation ≤0.05 mm) and axial clearance (controlled at 0.05-0.1 mm) should be checked to prevent axial movement of the backup roll during operation. These standards are the core installation guidelines provided by NEWBEE Transmission as a roller mill manufacturer to users and directly affect the service life of rolling mill bearings.
<!--[if !supportLists]-->2. <!--[endif]-->Scientific Lubrication Management: Select the lubrication method according to the rolling mill speed and temperature: high-pressure oil film lubrication (oil pressure 40 Bar, 68# extreme pressure industrial gear oil is recommended, NEWBEE NB-OIL68 is preferred) is recommended for hot and cold rolling mills with a speed <1500 rpm. The oil volume should be monitored in real time (≥5 L per hour) to ensure the formation of a stable oil film on the raceway; high-speed rolling mills with a speed ≥1500 rpm need to adopt an automatic grease replenishment system, with replenishment every 500 hours, and the filling amount is 1/3-1/2 of the internal space of the bearing (excessive filling may easily lead to excessive temperature rise); mixing different types of lubricating media (e.g., mixing grease and lubricating oil) is strictly prohibited, as this will lead to lubrication failure. Improper lubrication is the primary cause of premature failure of steel mill bearings, so it is necessary to strictly follow NEWBEE’s lubrication technical manual. 3. Regular Inspection and Maintenance: During daily operation, the bearing temperature (normal working condition ≤85℃, hot rolling working condition ≤120℃) and vibration value (≤4.5 mm/s) should be monitored in real time. If the temperature rises suddenly (single temperature rise >10℃) or abnormal noise (e.g., "clunking" impact sound) occurs, the machine should be shut down immediately for inspection (which may be caused by insufficient lubrication or roller damage); the seal integrity should be checked by disassembly every 1000 hours. If the seal lip is aged or scale invades, the seal should be replaced in a timely manner and internal impurities should be cleaned; when the bearing has operated to 70% of its recommended service life, preventive testing (e.g., ultrasonic flaw detection) is recommended to detect potential faults (e.g., raceway spalling, roller cracks) in advance, avoiding sudden failure of rolling mill bearings and consequent mill shutdown (the loss of a single shutdown can reach hundreds of thousands of yuan).
For the latest price, customization plans, or technical materials of Rolling Mill Support Bearings, please contact NEWBEE Transmission:
Email: paul@newbeetrans.com
Official Website: www.newbeetrans.com
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sales@newbeetrans.com
+8615090185276