Featured Industrial Instrumentation & Components
Premium solutions designed to monitor, filter, and control heavy machinery in demanding plant environments.
The Growing Demand for Precision Bearings in Bangladesh's Heavy Industries
Bangladesh is undergoing a massive industrial transformation. From the traditional ready-made garments (RMG) sector, the nation's economic landscape has rapidly expanded into capital-intensive heavy industries, including steel re-rolling mills, cement manufacturing plants, chemical processing facilities, and utility-scale thermal and hydroelectric power plants. Cities like Chittagong, Dhaka, Gazipur, and Narayanganj have emerged as major manufacturing hubs.
At the heart of this industrial expansion lies the mechanical power transmission systems that keep factories running. Rotating machinery such as steam turbines, heavy-duty electric motors, grinding mills, and rotary kilns rely heavily on precision bearings. When a high-capacity bearing fails, it can result in catastrophic downtime, costing factory operators thousands of dollars per hour. Consequently, understanding and implementing advanced bearing repair methods has become a top priority for factory managers, maintenance engineers, and bearing manufacturers operating in Bangladesh.
Advanced Repair Methods of Bearings in Modern Factories
Industrial bearings, particularly large-diameter spherical roller bearings, cylindrical roller bearings, and Babbitt alloy fluid-film bearings, represent a significant capital investment. Throwing away a worn bearing is often unnecessary, as professional refurbishment can restore the component to 90% to 100% of its original service life at a fraction of the cost. Below are the primary repair methodologies utilized by leading manufacturers and specialized service workshops:
1. Babbitt Alloy Re-Metalling and Re-Casting
Babbitt metal bearings (journal bearings) are widely used in critical high-speed rotating equipment such as steam turbines, turbogenerators, and heavy gearboxes. Over time, these bearings suffer from fatigue, cavitation, scoring, or thermal degradation. The repair process involves:
- Degreasing and Cleaning: Complete removal of old oil, grease, and carbonaceous deposits using chemical solvents.
- Old Babbitt Removal: Carefully melting out the damaged Babbitt lining without overheating the steel or bronze backing shell.
- Surface Preparation: Grit blasting or acid pickling the backing shell to ensure optimal bonding of the new alloy.
- Re-casting: Applying new tin-based or lead-based Babbitt alloy using centrifugal casting (for symmetrical cylindrical shells) or static pouring methods. Centrifugal casting is preferred as it eliminates porosity and ensures a dense, uniform grain structure.
- Ultrasonic Testing (UT): Performing non-destructive testing to verify a 100% bond between the Babbitt metal and the backing shell. Any delamination can lead to premature bearing failure under load.
- Precision Machining: CNC boring, turning, and scraping to achieve the exact design clearances and oil groove profiles required for hydrodynamic lubrication.
2. Laser Cladding and Thermal Spraying
For rolling element bearings, wear typically occurs on the shaft journal seat or within the housing bore. When these mating surfaces lose their dimensional tolerances, the bearing inner or outer ring can slip, leading to severe vibration and heat generation.
Laser Cladding is a state-of-the-art repair method where a high-energy laser beam melts a metal powder (such as cobalt or nickel-based alloys) onto the worn surface. This process creates a metallurgical bond with minimal heat-affected zones, preventing thermal distortion of the shaft. Once cladded, the surface is ground back to the exact micrometer tolerance required for a proper interference fit.
3. Raceway Regrinding and Oversized Roller Installation
When the raceways of large roller bearings exhibit minor spalling, pitting, or superficial wear, they can be remanufactured. The process involves grinding the worn raceways to remove surface defects and restore the original profile geometry. Because grinding increases the clearance between the inner and outer rings, the repair facility must install precision-matched, oversized rolling elements (balls or rollers) and design a custom cage to maintain the original internal clearance specifications.
4. Superfinishing and Polishing
Superfinishing is a low-temperature micro-stoning process that removes the amorphous "smear layer" left by grinding. It improves the surface finish to a mirror-like quality, reducing friction, lowering operating temperatures, and significantly extending the fatigue life of the repaired bearing. This is particularly beneficial in high-speed applications like turbine generators and compressor shafts.
Localized Application Scenarios in Bangladesh
How bearing repair and preventative maintenance keep key sectors operational across the country.
Cement Mills & Kilns
Bangladesh's massive cement industry relies on massive rotary kilns and ball mills. The support rollers and thrust bearings operate under extreme loads and dusty environments. Regular on-site inspection, polishing, and Babbitt re-casting prevent catastrophic structural failures.
Thermal Power Plants
Power stations in Ashuganj, Ghorashal, and Payra run large steam turbines. The rotor shaft bearings require absolute precision. Hydrodynamic journal bearing repair, coupled with oil filtration systems using high-grade elements, ensures uninterrupted power grid stability.
Steel Re-Rolling Mills
Steel plants in Chittagong subject roll neck bearings to extreme shock loads and cooling water contamination. Refurbishing these multi-row cylindrical roller bearings via raceway regrinding saves millions in replacement costs annually.
Dongfang Yoyik (Deyang) Engineering Co., Ltd.
Dongfang Yoyik (Deyang) Engineering Co., Ltd. founded in 2004, is located in Deyang, Sichuan, heavy industry base of China. YOYIK is manufacturer and trader of industrial products, integrating design, R & D, production, sales and service. The team has more than 20 professional technicians and experienced sales to provide you with professional, reliable and considerate services.
Our major products and service: steam turbine spare parts, steam turbine generator spare parts, utility boiler spare parts, control system parts, hydraulic components, pneumatic components, filters, filter elements, EH system accessories, bolt heaters, insulating materials, sealant, Babbitt alloy bearing, DC motor / AC motor accessories, motor repair, etc. Our products cover different fields such as thermal power generation, hydropower generation, minerals, chemicals, paper mills, ships, etc., and are sold to more than 30 countries and regions in Europe, Southeast Asia, South America, and Africa.
The rapid development of YOYIK has received strong support from all walks of life. The needs of our users are our reasons for existence. Our philosophy is to always care about user needs and help users solving issues.
Why Choose Us
A trusted partner for heavy industry machinery components and engineering services since 2004.
- Rich experience: spare parts expert in power industry since 2004.
- Powerful enterprise: one-step service for industrial traders and users.
- Wide range of products: over 3000 types of spare parts at your choice.
- Professional service: experienced and skilled engineers, intellectual property patents.
- Advanced equipment: high-tech production equipment and professional testing devices.
Our Services & Capabilities
Providing comprehensive manufacturing, trading, and engineering services globally.
As Manufacturer
YOYIK has strong strength in technical force and processing capabilities, fully equipped with CNC lathes, machining centers, vertical lathes, CNC boring machines, gantry planers, gantry milling machines, 80mm plate rolling machines, etc. We have provided high-quality equipment selection, construction design, installation and commissioning, after-sales service for the overhaul and technical transformation of hundreds of thermal power plants, hydropower stations, and metallurgical enterprises, and quickly and accurately provided a large number of steam turbines, generators, boilers and other spare parts.
As Trader
YOYIK provides a large number of imported NUGENT diatomite filters and other products for many steam turbine generator main engine suppliers and power plants and other industrial users. The company has great advantages in the price and delivery time of many hydraulic products, including pumps, valves, sealing materials, etc. The brands cover EATON, VICKERS, MOOG, STAR, COPALTITE, TEMP-TITE, 707, etc.
As Service Provider
With more than 17 years of experience in supplying various area of industrial products, YOYIK provides reliable solutions for the multi-factory, multi-channel and multi-brand product needs of large-scale manufacturing, large-scale trading enterprises. We have a special information management system to achieve efficient cooperation with suppliers and logistics. With many years of experience, channels and resources in export business, aiming at improving efficiency and reducing costs, we provide customers with the best choice for purchasing and reduce your worries in the process.
The History & Milestones
Our journey of innovation, research partnerships, and global project execution.
Supply of steam turbine spare parts to Qianbei Power Plant of Guizhou Xidian Electric power Co. Ltd.
We signed a supply contract of steam turbine spare parts with Nine Dragon Paper Dongguan branch (Hong Kong-owned).
We reached a strategic partnership with 707 Institution.
We started the cooperation with ABB of bearings research and development.
We undertook China CNR Corporation's project of the generator retaining rings on CRH traction engines.
We cooperated with Beijing Institute of Technology and CSR Zhuzhou Electric Locomotive Co. on researching and testing insulation materials for wind power.
Together with Xi'an Jiaotong University, we completed the research and experiment of the 3rd generation nuclear pump water lubricated bearings, and of the new bearing metal material and technology.
We completed the localization experiment of bearings for high-speed grinder together with Chongqing Hengbo Machinery Manufacturing Co. Ltd.
We studied and developed new insulating materials with Tsinghua University Shenzhen Branch.
Siemens employees from the Germany headquarters visited our company for the cooperation of mill sliding bearings.
We cooperated with Siemens Control System Department on the project of large hydropower station transformers.
We started the cooperation with Fruider India on steam turbine spare parts.
We won the bid of the stator inspection project of 600MW generator units of Guizhou Faer power Plant.
We provided steam turbine spare parts for Vietnam Electricity IDICO power plant.
We became an authorized distributor of Shanghai Xinli Machinery Plant under the Ministry of Space Industry of PRC.
Mr. Ivan from ALSTOM Ltd. visited our company.
We won the bid of the generator collecting rings and manually wrapping insulation project of Guizhou Xishui power Plant.
The Interplay of Lubrication, Filtration, and Bearing Longevity
In heavy industrial environments, bearing repair should be viewed as a secondary line of defense. The primary objective is always to prevent wear through robust predictive maintenance and high-efficiency filtration. Over 70% of all premature rolling element bearing failures are caused by lubrication issues, including contamination by solid particles, moisture ingress, or oil degradation.
For high-speed machinery like steam turbines, the lubricating oil must be kept extremely clean. Using advanced filtration elements, such as the Filter element QF1D350CJJHC or the Cellulose filter element LX-DEA16XR-JL, ensures that sub-micron particles are trapped before they can enter the bearing clearance zone. When hard particles enter the bearing, they cause micro-indentations on the raceway. As the rollers repeatedly pass over these indentations, stress concentrations develop, eventually leading to subsurface fatigue and spalling.
Furthermore, monitoring parameters such as shaft vibration and rotational speed using precision instruments like the Turbine Rotation Speed Monitor HZQS-02A or the Intelligent Rotational Speed Monitor WZ-3C-A allows engineers to detect early-stage bearing anomalies. A sudden increase in vibration amplitude or a change in the frequency spectrum often points to inner ring wear or cage instability, giving maintenance teams ample warning to schedule a planned repair before a catastrophic failure occurs.
Complete Industrial Product Catalog
Explore our full range of high-performance components, sensors, and replacement parts for industrial operations.
