I. Product Introduction

After NMT rolling mill bearings leave the factory, they require standardized installation, correct clearance setting and ongoing maintenance management to achieve their design performance under actual operating conditions. NMT provides not only bearing products but also a systematic service system围绕 bearing installation, operation and maintenance.

 

Installation Services: NMT provides guidance services for the bearing installation process, covering pre-installation inspection (bearing model verification, visual inspection, roll neck and housing dimension verification), installation method selection (applicable conditions and key points for cold fitting, hot fitting and hydraulic installation) and post-installation acceptance (clearance measurement, rotational accuracy inspection).

 

Clearance Setting: The axial clearance of four-row tapered roller bearings is a critical control parameter during installation. NMT provides precise cold installation clearance target values based on mill type, operating temperature and load conditions, and assists users in completing clearance measurement and spacer ring fitting during installation.

 

Maintenance Guidance: NMT provides maintenance recommendations during bearing operation, including daily inspection content (temperature, vibration, noise monitoring), grease change intervals and operating procedures, and seal condition inspection and replacement timing assessment.

 

Remanufacturing Services: When bearing raceway surfaces develop fatigue spalling or wear, NMT provides remanufacturing services, removing fatigue layers through precision grinding, replacing rolling elements and cages, and restoring bearing performance to near-new levels.

 

II. Core Product Advantages

Systematic Installation Guidance: NMT provides differentiated installation guidance solutions according to different mill types and bearing specifications. Installation guidance covers the entire process from unpacking inspection to installation acceptance. For four-row tapered roller bearings, NMT provides axial clearance measurement methods and precise calculations for spacer ring fitting; for four-row cylindrical roller bearings, NMT provides interference fit recommendations for outer ring and housing配合 and installation pressure control.

 

Precise Clearance Management: Clearance is a core parameter affecting rolling mill bearing life and rotational accuracy. NMT calculates and recommends optimal cold installation clearance values based on bearing operating temperature, speed and load conditions. For four-row tapered roller bearings, clearance is achieved by adjusting spacer ring thickness between inner rings; for four-row cylindrical roller bearings, clearance is determined by the配合 between the bearing and the roll neck and housing. NMT provides measurement tool selection recommendations, measurement method guidance and result verification during clearance setting.

 

Standardized Lubrication Management Recommendations: NMT provides grease selection recommendations, fill quantity calculations and change interval recommendations based on bearing type, operating conditions and environment. Grease fill quantity is controlled at 30% to 50% of the bearing's internal free space. For mill conditions with severe water spray, NMT recommends grease formulations with excellent water resistance. Grease changes follow the “drain—flush—refill” three-step procedure, with the flushing step using a small amount of new grease to carry out residual old grease and contaminants from the bearing interior.

 

Seal System Inspection and Maintenance: The effectiveness of the sealing system directly affects bearing life. NMT provides seal condition inspection methods (visual inspection of seal lip wear, hardening or deformation; inspection of labyrinth seal gap blockage) and replacement timing judgment criteria. For bearings using combined seals, NMT recommends periodic inspection of outer labyrinth seal drain holes for畅通 and inner contact seal lip compression within reasonable range.

 

Remanufacturing and Life Extension: NMT provides bearing remanufacturing services, removing fatigue layers from raceway surfaces through precision grinding to restore geometric accuracy and surface quality, while replacing rolling elements and cages with new components of the same specifications and重新 performing clearance matching and accuracy inspection. Remanufactured bearings can achieve accuracy and load capacity close to new product levels. Remanufacturing services help extend the overall service life of bearings and reduce users' bearing cost per ton of steel.

 

III. Typical Application Scenarios

Bearing Assembly During New Mill Installation——During the equipment installation phase of new rolling lines, NMT provides on-site installation guidance services. Services include: roll neck and housing dimension verification, bearing installation method selection and operation guidance, four-row tapered roller bearing axial clearance measurement and setting, and four-row cylindrical roller bearing配合 verification. After installation, NMT assists users in rotational accuracy inspection and no-load running-in monitoring.

 

Periodic Maintenance for In-Service Mills——During mill operation, NMT provides periodic maintenance guidance services. Services include: grease condition sampling and testing recommendations, seal system inspection methods, and interpretation of temperature and vibration monitoring data. Based on monitoring data, NMT assists users in determining whether bearings require clearance adjustment, grease change or scheduled maintenance.

 

Diagnosis and Handling After Bearing Failure——When bearings experience abnormal temperature rise, increased vibration or sudden failure, NMT provides on-site diagnosis and handling recommendations. Services include: macroscopic inspection and preliminary judgment of damaged bearings, failure cause analysis and tracing, and subsequent handling plan recommendations (continue operation, scheduled replacement or emergency replacement).

 

Remanufacturing After Bearing Service Life——When bearings reach design service life or raceways develop fatigue spalling, NMT provides remanufacturing services. After bearings are returned to the NMT factory, they undergo cleaning, inspection, grinding, rolling element and cage replacement,重新 matching and other processes, and are returned to service after performance restoration.

 

IV. Quality Assurance

Precision Control During Installation: NMT emphasizes precision control of key parameters during installation guidance. Axial clearance measurement accuracy for four-row tapered roller bearings is controlled within 0.01mm. Installation advance quantity for four-row cylindrical roller bearings is precisely calculated based on interference and配合 length, with displacement sensors used to monitor advance quantity during installation. Hot-fitted bearing heating temperature is controlled within 80-120°C, using oil bath heating or induction heating to ensure uniform heating.

 

Traceability of Maintenance Records: NMT recommends that users establish independent operation files for each bearing set, recording installation date, installation clearance, initial grease type and fill quantity, each grease change date and old grease condition, daily inspection data and any abnormal events. Complete operation files help track bearing condition and provide data foundation for subsequent life assessment and failure analysis. NMT provides standardized bearing operation record sheet templates.

 

Quality Standards for Remanufacturing: NMT remanufacturing services执行 the same quality inspection standards as new products. Remanufactured bearings undergo rotational accuracy testing, vibration testing and clearance re-measurement to ensure performance restoration to near-new levels. Remanufactured bearings carry the same quality assurance as new bearings.

 

Full-Process Traceability Management: From new product出厂 to installation, routine maintenance to remanufacturing reuse, NMT assists users in establishing a full-process traceability management system for bearings. The factory serial number, installation records, maintenance records and remanufacturing records of each bearing set form a complete data chain.

 

V. Product Range

NMT offers the following service products for steel metallurgical rolling equipment:

 

Installation Guidance Services: Covering the entire process from unpacking inspection, dimension verification, installation method selection, clearance setting to installation acceptance.

 

Clearance Setting Services: Providing calculation, measurement and spacer ring fitting guidance for four-row tapered roller bearing axial clearance, and配合 verification and adjustment recommendations for four-row cylindrical roller bearings.

 

Lubrication Management Services: Providing grease selection recommendations, fill quantity calculations, change interval recommendations and grease change operation guidance.

 

Seal Inspection and Maintenance Services: Providing seal condition inspection methods, replacement timing judgment and seal upgrade recommendations.

 

Condition Monitoring and Diagnosis Services: Providing interpretation of temperature and vibration monitoring data and abnormal diagnosis recommendations.

 

Remanufacturing Services: Providing bearing cleaning, inspection, grinding, rolling element and cage replacement,重新 matching and precision inspection services.

 

Training Services: Providing specialized training for on-site maintenance personnel in bearing installation, clearance setting, lubrication management and failure identification.

 

VI. Brand Strength

NMT has accumulated sustained service experience in rolling mill bearing installation, maintenance and full lifecycle management.

 

Installation Experience: NMT has accumulated on-site bearing installation experience on multiple types of mills (hot rolling, cold rolling, continuous casting, Sendzimir, etc.). Familiar with the requirements of different mill structures for bearing installation, and able to provide flexible installation solutions according to site conditions.

 

Fault Diagnosis Capability: Based on systematic understanding of rolling mill bearing failure modes, NMT can quickly determine damage types and possible causes on site, providing targeted handling recommendations for users.

 

Completeness of Service System: NMT has built a service system from installation to remanufacturing围绕 the full lifecycle of bearings. Users can obtain corresponding technical support at various stages of the bearing lifecycle without needing to seek different service providers at different stages.

 

Continuous Service Improvement: Based on user feedback and issues encountered during on-site services, NMT continuously optimizes installation guidance solutions, maintenance recommendations and service processes. The accumulation of service experience enables NMT to more accurately anticipate issues that may arise under different operating conditions and provide preventive recommendations before users提出 needs.

 

VII. Global Collaboration

NMT provides rolling mill bearing installation, maintenance and full lifecycle management services to steel mills, non-ferrous metal processors and metallurgical equipment manufacturers worldwide.

 

Service Reach: Installation and maintenance services are适配 for various hot rolling, cold rolling, continuous casting and non-ferrous metal rolling production lines.

 

Collaboration Model: NMT provides customized installation guidance solutions and maintenance plans according to users' specific mill parameters and operating conditions. NMT can provide corresponding technical support during new mill installation, in-service mill operation and bearing remanufacturing stages.

 

On-Site Services: NMT can dispatch engineers to site to provide installation guidance, maintenance training and fault diagnosis services according to user needs. On-site service timing and content are flexibly arranged according to users' actual requirements.

 

Long-Term Technical Collaboration: NMT establishes long-term technical collaboration relationships with users, providing ongoing support in bearing selection, installation standard development and maintenance system optimization. Through regular follow-up visits and technical exchanges, NMT assists users in continuously improving bearing management levels.