Global competition pattern of China bearing manufacturer

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No.1 Asia accounts for half of the world’s from end user competition situation

Bearing is an important part of modern mechanical equipment, And its main function of rotation is to reduce the friction coefficient of the rotating body, and ensure its rotation accuracy. Therefore, its application range is very wide and the market demand is strong. Asia, represented by China and Japan, accounts for half of the global bearing consumption and becomes the largest bearing consumer market in the world. Europe and North America followed, with 25% and 20% respectively.

No.2 Supply side competition pattern: eight groups divide up the market

After years of industrial competition, the global bearing industry has formed a monopolistic competition pattern. The market is divided by eight multinational groups of Sweden, Germany, Japan and the United States, including Swedish enterprise SKF, German enterprise Schaeffler (INA+FAG), Japanese enterprise NSK, NTN, NMB, Nachi, jtket and American Enterprise TIMKEN, These eight companies account for more than 70% of the global market share.

— Competition pattern in China

Regional competition: five industrial clusters have their own characteristics

From the perspective of regional competition, China’s bearing industry has formed industrial clusters, including Wafang area of Liaoning Province, Luoyang region of Henan Province, eastern Zhejiang region, Liaocheng region of Shandong Province and Yangtze River Delta region. Each region has its own characteristics. For example, Liaoning Wafang area has the advantages of major equipment bearings, and eastern Zhejiang region is good at precision small and medium-sized bearings.

— Competition among Bearing manufacturer

Competition level: local enterprises occupy middle and low end market, From the level of competition, the high-end market of bearing manufacturing in China is mainly occupied by the eight multinational bearing groups mentioned above. China’s local enterprises mainly occupy the middle and low-end market, and the representative enterprises are renben Group Co., Ltd., Wanxiang Qianchao Co., Ltd., Wafangdian Bearing Group Co., Ltd. However, with the improvement of manufacturing technology by local bearing manufacturers, some large-scale local enterprises have been able to produce high-end products, such as the Supporting bearing of large electric wheel dump truck produced by ZWZ group, which has successfully replaced the imported products.

— Market concentration: low market concentration

China’s bearing manufacturing industry belongs to a completely competitive market with a large number of enterprises and low market concentration. According to the data of China Bearing Industry Association, in 2019, China’s bearing industry achieved a revenue of 177 billion yuan, of which the top 10 bearing manufacturers achieved 50.67 billion yuan, accounting for about 28.63 percent.

— Representative enterprise:

Representative enterprise: Renben Group’s Revenue First

In 2019, the top ten enterprises of bearing business income of Chinese bearing manufacturing enterprises

Company Name (Chinese languge) Company Name Representative products
1 人本集团有限公司 Renben Group Co., Ltd Automobile bearing, household appliance bearing
2 万向钱潮股份有限公司 Wanxiang Qianchao Co., Ltd Automobile bearing
3 瓦房店轴承集团有限公司 Wafangdian Bearing Group Corp. Spherical roller bearing
4 浙江天马轴承集团股份有限公司 Zhejiang Tianma Bearing Group Co., Ltd. Cylindrical roller bearing, deep groove ball bearing
5 洛阳LYC轴承有限公司 Luoyang LYC bearing Co., Ltd Extra large rolling mill bearings
6 浙江五洲新春集团股份有限公司 Zhejiang Wuzhou Xinchun Group Co., Ltd Small and medium precision bearings, tapered roller bearings
7 慈兴集团有限公司 Cixing Group Co., Ltd Precision ball bearing, miniature bearing
8 湖北新火炬科技股份有限公司 Hubei New Torch Science & Technology Co. Ltd wheel hub bearing
9 襄阳汽车轴承股份有限公司 Xiangyang Automobile Bearing Co., Ltd Automobile bearing
10 环驰轴承集团有限公司 Huanchi Bearing Group Co., Ltd High precision deep groove ball bearing, tapered roller bearings

— Product competition
According to the structure, Rolling bearing has the advantages of high transmission efficiency and good mechanical performance, which is the leading type in the bearing industry, the bearing type are：

1. Deep Groove ball bearing
2. Cylindrical roller bearing
3. Aligning ball bearing
4. Spherical Roller Bearing
5. Needle Roller Bearing
6. Mounted ball bearing unit
7. Angular contact ball bearing
8. Tapered Roller Bearing
9. Thrust ball bearing
10.Thrust roller bearing

And also the bearing have slide motion type

1. Spherical plain bearing
2. Linear bearing, linear guideways
3. Linear Sliding Guideway Rail

According to the size of the production: miniature and small size bearings, medium and large bearing,extra large bearing   According to the size classification, with the continuous development of bearing technology in China, bearing enterprises in China have begun to compete with foreign enterprises in the field of miniature and small bearing, with a large production volume. However, the output of bearing products above medium and large is still relatively small.   However, with the development of China’s major equipment manufacturing industries, such as aerospace and military industry, machine tools, wind power, etc., the demand for medium and large-scale bearing products is gradually increasing. Enterprises are also constantly introducing, developing and producing such bearing products, and the output has increased in recent years.

By downstream application products: Automobile bearing is the largest demand on the market   Bearings are widely used in the downstream. At present, bearings are mainly used in automobile industry, accounting for about 37%. The second are household appliance bearings, motor bearings and textile machinery bearings, accounting for 12%, 11% and 5% respectively.

New energy vehicle bearing is the new profit growth point of China Bearing Manufacturer

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ZWZ’s efforts in the field of new energy vehicle bearings have finally paid off recently. The cylindrical roller bearing of a certain specification developed by them has stood out in the competition with many international well-known bearing enterprises. In the second half of the year, they began to batch support the world-famous Nordic luxury brand new energy SUV passenger cars. A new energy automobile bearing project was recently held in the 9th China Innovation and Entrepreneurship competition (Dalian competition area) and the 6th Dalian Innovation and entrepreneurship competition Won the first prize.

As the world’s largest producer of new energy vehicles, China’s new energy vehicles are in the ascendant. In order to meet the market demand of new energy vehicles, ZWZ group( Top 1 bearing manufacturer in China) has accelerated the research and development of supporting bearings, and has successively developed high-speed silent deep groove ball bearings, tapered roller bearings and cylindrical roller bearings with high speed, low noise and long life, which are matched with the drive and deceleration mechanism of new energy vehicles. Up to now, ZWZ group has developed nearly 50 kinds of bearing supporting new energy vehicles.

According to Wen Shaoying, director of the Automobile Bearing Research Institute of ZWZ group, the working speed of new energy automobile bearing is as high as 16000rpm. After special raceway design, special seal structure design, special silent grease selection, special raw material development and special heat treatment process application, the bearing group has achieved the basic theoretical research, bearing design and manufacturing, testing and service The strong coordination of the links has achieved the supporting standards of new energy automobile enterprises. The bearing shaft is two specifications of bearings for a famous brand new energy passenger car secondary reducer with differential gear box. In the three-way limit speed test conducted in the well-known bearing test center in China, the limit speed reaches 20400rpm and the test time reaches 1300 hours.

In the development of new energy vehicle bearing market, ZWZ group is giving full play to the advantages of batch supply in overseas market, driving the expansion of domestic market share, forming a good pattern of domestic and international dual market forces and synchronous promotion of front and rear markets, making new energy vehicle bearing a new profit growth point of the company.

China high quality cylindrical roller bearing manufacturer

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Cylindrical Roller Bearings are a type of bearing that use cylindrical rolling elements instead of steel balls，These cylindrical rollers provide a larger contact area and are therefore able to support larger radial loads. Due to their design, Cylindrical Roller Bearings are unable to support significant thrust loads. Depending on the application, Cylindrical Roller Bearings are available with or without cages. Without a cage, Cylindrical Roller Bearings are able to support higher loads, however, this limits their application to low speed systems.

While Cylindrical Roller Bearings are typically supplied with both inner and outer races, these races can also be integrated into the shaft or other system components, Such design choices are often necessary when space is limited within the system.

Single Row Cylindrical Roller Bearings is one kind of Cylindrical roller bearing design. The material are adopt high quality chrome steel, this design are separable. the bearing ring with the rollers and cage assembly can be separated from the other ring, single row cylindrical roller bearings not only NU series design, but also N, NJ, NUP design, CoatMaster bearing have two integral flanges on the outer ring and no flanges on the outer ring. this kind of bearing can accommodate axial displacement of the shaft relative to the housing in both directions.

CoatMaster brand cylindrical roller bearing is the China Top Quality cylindrical roller bearing, we can see why CoatMaster higher quality than EASIER

New performance class

Cylindrical roller bearings with up to three times longer service life than the previous EASIER standard, which is superior to all other conventional cylindrical roller bearings. The performance improvements of  cylindrical roller bearings over the past 15 years have permitted downsizing, whilst still maintaining the required performance

Material

CoatMaster bearings feature an extremely clean and homogenous steel with a minimum number of inclusions. This improved steel is so much cleaner than the highest grades covered by present classifications. The reduction in the number of inclusions increases the fatigue strength in the rolling contacts and enables the bearings to operate much longer.

Heat treatment

New heat treatment procedures optimize the bearing resistance to operational damage and temperatures without affecting dimensional stability.

Logarithmic contact profile

This important feature of CoatMaster cylindrical roller bearings – for the past years – has been further refined for the rollers used in XRB bearings. The bearings are thus even less sensitive to small misalignment and can carry heavy loads.

Roller end/flange geometry

The optimized roller end/flange contacts of CoatMaster cylindrical roller bearings are also present in XRB bearings. The resultant advantages include reduced friction, lower operating temperatures and less wear

Material hardness

The hardness of the rings and rollers of CoatMaster bearings have been selected for optimum performance. This makes them less sensitive to contaminants and contributes to their extremely long service life.

Surface finish

The surface finish of the raceways on the rings and rollers has been further refined and provides enhanced lubrication conditions in CoatMaster bearings so that they can operate longer even under poor lubrication conditions.

Manufacturing quality

Upgraded manufacturing processes have contributed to a significant improvement in product quality. This means that the rings can be produced with an increased roundness and the deviation from true form of the rollers has also been further reduced. The results of the tighter tolerances may be invisible but the bearings run markedly quieter and with less vibration.

Cage design

The design and material of the cage can have a significant impact on a bearing’s ability to withstand given operating conditions. That is the reason for making XRB bearings available with up to four different cages. The design of the cages used in Coatmaster bearings contributes to good lubrication of all contact surfaces, even under occasional interruptions in lubricant supply.

Cylindrical Roller Bearings also have the other different design as follows

–Single Row Cylindrical Roller Bearings

–Double Row Cylindrical Roller Bearings

–High Capacity Cylindrical Roller Bearings

–Single Row Full Complement Cylindrical Roller Bearings

–Double Row Full Complement Cylindrical Roller Bearings

And different types of cylindrical roller bearings also have their different design according to their feather, and also many kinds of cages, just like Brass cage, Pressed Steel cage, nylon cage etc.

Feature of Cylindrical Roller Bearing

1.The rollers and raceway of inner ring and outer ring are in line contact or repair line contact, this design can make the bearing have large carry capacity. So Cylindrical roller bearing are suitable for heavy load and impact load.

  1. Low friction coefficient, suitable for high speed, its limited speed are closed to deep groove ball bearing.
  2. N and NU series Cylindrical roller bearing can move in axial direction, so they can accommodate to the changes in the relative position of the shaft and the housing due to thermal expansion or mounting errors.
  3. High standard for the machining of shaft or seat holes, Relatively skew for the axial of the outer ring should be control strictly. So the Contact stress concentration can be avoid.

The outer ring and inner ring of Cylindrical Roller Bearing are separatable, the design are easy installation and removal.

N, NU series cylindrical roller bearing

N series cylindrical roller bearing have no flange on outer ring, and double flange on inner ring. This design Allows displacement of the shaft relative to the bearing housing in both axial directions.

NU series cylindrical roller bearing have flange on both side of the outer ring, and no flange on inner ring, it also allows movement of the shaft relative to the housing in both axial directions, so this design suitable for used as floating bearing.

NJ, NF Series cylindrical roller bearing

NJ series cylindrical roller bearing have ribs on both side of the outer ring, and single flange on one side of inner ring. It Can withstand a certain degree of one-way axial load .

NF series cylindrical roller bearing have single flange on one side of outer ring, double flange on inner ring , it can carry certain degree of one way axial load. Therefore, this type of structure is suitable for use as a single direction axial locating bearing

NUP , NFP series

NUP Series cylindrical roller bearing have flange on both side of outer ring, and one fixed flange on one side of inner ring,and the other side are separable loose rib .it can bear a certain degree double direction axial load.

NFP series cylindrical roller bearing with fixed single flange on outer ring, and separable loose rib on the other side of outer ring, inner ring have flange on both side, it can take a certain degree axial load from double direction.

This kind of bearing can control the axial direction displacement of the shaft relatively bearing housing in two directions. Therefore, it is suitable for use as a fixed-end bearing.

Double Row Cylindrical Roller Bearing

Double Row cylindrical roller bearing have cylindrical bore and taper bore design, taper bore suffix K , This type of bearing has the compact structure, high rigidity, and large carrying capacity . Small deformation after load such advantage . Particularly suitable for machine tool spindle . taper bore can also play a minor role in adjusting the tolerance. And also can simplify the locating device structure . its Easy to install and remove. Commonly used double row cylindrical roller bearings have the following several forms.

XRB is the China bearing manufacturer, exporter, supplier, it can supply China Cylindrical roller bearing, Our large quantity Cylindrical Roller Bearings Stock can meet your need with good quality and fast delivery, Also you can find China cylindrical roller Bearing, the other type and brand bearing. just like NSK, SKF, NTN, KOYO, TIMKEN, McGill, PMI, ABBA, SBC, ZWZ, C&U, We accepted DHL,FEDEX,TNT express for small order and samples order,also the transportation By AIR or By Sea,by Train are all available, we asure we can ship high quality cylindrical roller bearing to your office at the first time.

China Bearing used in oil & natural gas industry

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With the development of offshore oil and natural gas, the demand for oil refining, ethylene and three major synthetic materials is gradually increasing. In this way, a large number of oil and gas pipeline gathering and transportation equipment and large-scale and efficient petrochemical equipment are needed, with emphasis on the development of large-scale oil exploration and drilling and production equipment in the desert and ocean. Therefore, the market demand for supporting and maintaining bearings, mechanical seals and packing static seals for petrochemical equipment will increase greatly every year.

It is suitable for the high temperature resistant sealed self-aligning roller bearing in the harsh environment. It is characterized by rubber seals on both sides to ensure the safe operation of bearing raceway in the dust-free environment and prevent the leakage of lubricating grease. It has the advantages of dust-proof, water-proof, high-temperature and high-pressure resistance, heavy load, etc., as well as open type and high-temperature resistant bearing suitable for specific applications. It can be used in -40 to +200 ℃ Under the condition of continuous safe operation, this is an attractive feature, which can not be replaced in many demanding applications.

The drilling equipment used in the oil industry includes mud pump, winch, top drive, crown block, etc. Working condition: heavy load, much sediment, strong corrosion, large impact vibration. The deep groove ball bearing, self-aligning roller bearing, cylindrical roller bearing, tapered roller bearing and thrust cylindrical roller bearing provided by coatmaster company increase the load capacity, improve the corrosion resistance and impact resistance performance, and extend the service life of the bearing by strengthening the design and manufacturing.Successful cases: our company’s four point contact ball bearing ar03-10, slr20 / 848 and thrust cylindrical roller bearing are used in an oil well in Shanghai, Xinjiang

Coatmaster China petroleum machinery bearing provides high-performance bearing solutions for petroleum machinery industry. In the field of petroleum machinery, the working conditions of the industry are harsh, high pressure, high temperature and various kinds of pollution seriously affect the normal operation of machinery. Coatmaster provides customers with safe and stable petroleum machinery bearing solutions for the industry environment, effectively improving energy efficiency and equipment working time Longer, less maintenance.

Coatmaster has more than 20 years of experience in rolling and sliding bearing design. It provides customers with a series of China bearing solutions specially designed for oilfield applications. Coatmaster provides us with unique capabilities using the latest analytical tools, including solid modeling, finite element analysis and proprietary bearing design programs. Using CMM enables coatmaster to accurately measure components to ensure the precision required for unique solutions to complex problems.

Mud pump and fracturing pump application

China Coatmaster heavy-duty needle roller bearing is specially designed for the position of crosshead bearing of mud pump. Coatmaster type provides higher load than single row roller. The series roller can get enough strength to guide the cage correctly. Compared with single row of rolling elements, the bearing capacity of double row of rolling elements is increased by more than 40%, and the fatigue life is increased by more than 200%.

Coatmaster offers a full range of large diameter, high quality cylindrical roller bearings, standard and custom designed, with an outside diameter of up to 60 inches (1500 mm). These bearings are made of high quality carburized or hardened steel. Coatmaster cylindrical roller bearing adopts bronze pin type cage and full roller type. Single row, double row, multi row, standard and customized bearings are available.

Coatmaster offers a wide range of single row and double row tapered roller bearings with an inside diameter of 11 inches (279 mm) or greater. Our highly specialized tapered roller bearing, inner ring, outer ring and roller are all carburized, so that the appearance is hard and the inside is soft, so that the bearing can bear heavy impact load and have better performance. The superior performance comes from the super precision of the rolling body, the raceway surface contacting with the rolling body and the unique raceway curve. The accuracy of tapered roller bearing reaches 2 kinds of standards, which is very suitable for the most demanding application requirements.

Rotary drive turntable application

Coatmaster produces highly specialized turntable bearings with a diameter of more than 60 inches (1524 mm), which are used in the design of turntable driven by oilfield equipment. Our turntable bearings are made of high-quality bearing steel and the most advanced manufacturing technology in the United States, and have achieved unparalleled performance in the most demanding environment. At the same time, many standard turret bearings are in stock and ready for shipment.

 

Top drive, swivel and hook applications

Coatmaster produces a range of heavy-duty tapered roller thrust bearings with an inside diameter of 4 inches (101 mm) to 16 inches (406 mm). Coatmaster heavy-duty tapered roller thrust bearing is specially designed for use in harsh environments. These bearings are equipped with carburized inner and outer rings and machined brass cages. The large end face of the roller is processed into a spherical shape, which is matched with the corresponding inner and outer rings. Under the guidance of the cage, the lubrication effect is improved. These bearings are well suited for extreme high thrust and shock loads. When the speed is not high and it needs to bear super-high load, we have full roller tapered roller bearing to meet your maximum load application requirements.

Coatmaster supplies a wide range of standard cylindrical roller thrust bearings from 3.5 “(89 mm) to 24” (610 mm) in outside diameter. These high load cylindrical roller thrust bearings are ideal for heavy and medium speed applications. Coatmaster cylindrical roller thrust bearing consists of two hardened and finely ground bearing steel inner and outer rings, equipped with machined brass cage, so that the roller can normally operate in each cage unit. The performance of the bearing will be enhanced according to the use of multiple rollers and different lengths in the same cage unit. Rollers placed in a staggered position create overlapping raceway grooves to prevent wear and thus extend bearing life

Pipeline treatment and application of CT injector

Coatmaster has a complete set of CAM Follower roller bearing production line, which is very suitable for the application of large impact load, high rotation speed and corrosive application environment. With a long history of innovation, coatmaster has ushered in a new era of roller bearing, which provides a maintenance free bearing in the most robust applications with higher load, higher speed.

The same innovation also comes from coatmaster CAM Follower roller bearing, which allows customers to easily and quickly lubricate the bearing where it is difficult to reach frequently or hard to touch the roller head.

Coatmaster CAM Follower roller bearings are manufactured to strict specifications and can be supplied with corrosion resistant coatings and coatings when required.

Coatmaster special injection head bearing uses our technology to improve the dynamic and static load bearing of the bearing. The carburizing treatment of the inner and outer rings makes the bearing more durable when impacted. Grease port is used in the center of end face to facilitate grease lubrication to each raceway surface.

Offshore equipment application

Coatmaster self-lubricating bearings are widely used in offshore equipment, where environmental conditions are serious and external lubrication is impractical. The bearings are made of corrosion-resistant alloy and solid lubricant developed for seawater utilization. Bearing provides reliable performance, long service life, no need to supplement lubrication, and free maintenance.

Coatmaster is capable of manufacturing slewing rings with a design range from 24 inch (610 mm) to 169 inch (4293 mm) diameter. If necessary, the slewing ring bearing can be matched with the internal and external transmission devices. The types of slewing support are single row, double row ball, single row roller and multi row roller.

SKF acquires PEER bearing production base in China

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On June 25, 2008, SKF announced in Gothenburg, Sweden that SKF had signed an agreement with the owner of peel bearing in the United States to acquire peel and its production bases in China and Thailand.

Peer is a brand trusted by the global leaders in the field of agricultural machinery bearing and garden equipment bearing products. Peer is a leading innovator of agricultural machinery bearings, and its patented maintenance free solution can help farmers and landscape designers around the world improve productivity. We are committed to improving our influence in these industries as a commitment to our customers

1. The sealing performance is superior, and the service life of various agricultural machinery is extended to the greatest extent
2. award winning custom solutions for the most demanding application environments
3. Environmental protection and maintenance free solutions can reduce labor, lubrication costs and machine purchase costs

Agricultural machinery bearing is a special sealed ball bearing widely used in foreign agricultural machinery. According to the design of disc plow, disc harrow and other agricultural farming machinery, its design has the characteristics of large transfer load, mud water easy to enter into the bearing during farming, working shaft (plough shaft or harrow shaft), etc., and it is a specially designed bearing with good sealing performance, good centering performance, large bearing capacity, easy to install and disassemble.

The world’s leading bearing brands take bearing operating temperature as an important index. Therefore, the operating temperature of low temperature bearing reflects the material technology and processing level of bearing processing. The measurement is mainly based on the temperature difference between the outer ring of the bearing and the injected cooling oil during operation. Lower operating temperature means longer service life and higher performance. World famous bearing manufacturers, relying on their own advantages, strive to obtain comparative advantages in many fields. Taking the American Fute low temperature deep groove ball bearing as an example, after strict testing, the operating temperature of this kind of product of the company is lower than that of similar products in the market, about – 25.5 ℃, while other internationally famous brands are all above – 119 ℃. The common low temperature bearings are single row deep groove ball bearings and cylindrical roller bearings.

The following is a review of the incident by people from all walks of life in China’s bearing industry

Shan Yibing, an industry expert of Luoyang Bearing Research Institute:
this merger is more significant than that of SKF in many places in China. It is not surprising that foreign capital purchases China’s small and medium-sized bearing enterprises, which will happen in the future. It is worth worrying that if there is a good enterprise, foreign capital will come to buy it. In the long run, the development of national industry and enterprises will be affected

Xu Shaoren, deputy chief engineer of Luoyang LYC bearing Co., Ltd:
Peer bearing has a narrow product range. Xinchang peer’s products are mainly foreign trade, and the product structure is not the same as that of LYC. From the current point of view, it has little impact on Luoyang LYC, and the key is the future development.

He Jiaqun, Deputy Secretary General of China Bearing Industry Association:
it’s an international practice for SKF to buy Peer, and it’s normal for foreign companies to buy Peer. Schaeffler’s acquisition of LYC is a foreign enterprise’s acquisition of China’s industry leader, with totally different nature

He long, deputy head of science and technology of Xinchang City:
Xinchang City is a big bearing industry in China, with nearly 1300 bearing enterprises, The annual output value of bearing industry is 15 billion yuan. Xinchang has the largest machining production base in Asia, and the largest bearing enterprise output value reaches 1 billion yuan. However, at present, the development of Xinchang bearing industry is uneven, and most of the enterprises are low, small and scattered. The arrival of the world’s top 500 will undoubtedly promote and accelerate the development of Xinchang bearing industry and upgrade and pull the product grade of Xinchang bearing. In this sense, we are welcome. 50 million USD per year for SKF

Zhang Feng, President of Zhejiang Wuzhou XinChun Bearing Co.,Ltd:
It should be said that the arrival of SKF is beneficial to the development of Xinchang bearing industry. From the perspective of finished bearings, SKF will bring many new products; from the perspective of supporting parts, it will bring more demand for accessories.. As xinchang peer’s products are relatively single and its technical level is medium, and SKF has invested in many enterprises in China, I think this merger has little impact on China’s bearing industry.

Why the China bearing bush of supporter of rotary kiln heating?

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When the sliding bearing works, a very thin oil film is required between the bearing bush and the shaft for lubrication. If the lubrication is poor, there will be direct friction between the bearing bush and the shaft, which will produce high temperature. Although the bearing bush is made of special high temperature resistant alloy material, the high temperature generated by direct friction is still enough to burn it out. The bearing bush may also burn due to excessive load, high temperature, impurities in lubricating oil or abnormal viscosity and other factors. The sliding bearing was damaged after burning.

As the “heart” equipment of cement plant, the operation quality of rotary kiln directly affects the production and operation efficiency of the whole cement plant.

Its power consumption is: heavy load, slow speed, high temperature, large temperature difference, outdoor operation, long-term operation in harsh environmental conditions. The kiln is lined with firebrick, the sintering temperature is thousands of degrees, the total weight of kiln is hundreds of tons, supported by six supporting wheels, each bearing bush of a supporting wheel bears dozens of tons on average, and the bearing bush of supporting wheel is often affected by impact load and adjustment.

Therefore, the heating phenomenon of the supporting wheel bearing bush is a common problem in the production and operation of the rotary kiln. If the heating of the bearing bush is not treated in time, it may cause the phenomenon of burning the bush. The best way to deal with the burning of the Bush is to scrape the bush again after the kiln is stopped. However, it usually takes about 3 days from the kiln temperature cooling down to the completion of the Bush re scraping, and it will take another 2 days from the kiln re ignition and temperature rise to the feeding, which has a serious impact on the production.

Common causes of heating of supporting wheel bearing bush

  1. The roller bearing shell is heated due to lubricating oil. If the lubricating oil of the bearing bush of the supporting wheel meets the oil change standard but does not change the oil, the viscosity of the lubricating oil will be reduced, or the oil will be emulsified, or the oil will contain dust and impurities, etc., which can cause the bearing bush to heat up.
  2. Bearing bush heating caused by oil leakage of supporting roller and falling off of lubricating device. Due to the poor sealing and serious oil leakage of the supporting axle, the oil level is reduced, or the lubricating oil scoop falls off and the lubrication is insufficient, which causes the temperature of the bearing bush to rise.
  3. The bearing bush is heated due to poor circulating water, small amount or water seepage of internal circulating water pipe. If the circulating water is not smooth or the amount is small, the poor effect of circulating cooling will cause the bearing bush to heat up. When the circulating water pipe inside the supporting wheel is aged and causes water leakage, the lubricating oil will be emulsified, the oil quality will be deteriorated, and the bearing bush will heat up.
  4. Temperature rise of bearing bush due to small clearance of bearing mouth. The contact angle between the bearing bush and the shaft becomes larger and larger when the supporting wheel bearing bush is used for a long time. At the same time, the contact clearance between the Bush mouth and the shaft becomes smaller and smaller. To a certain extent, the lubricating oil cannot enter the bottom of the Bush for lubrication, which causes the Bush to heat up.
  5. Temperature rise of bearing bush caused by stress concentration on the surface of wheel belt and supporting wheel. Under the condition of normal stress, the contact surface of the supporting wheel and the wheel belt should have the same bright color, and there is no obvious longitudinal bright and dark stripe on the wheel belt. If there are light and dark stripes, the bright side indicates that the bearing pad of the bearing pedestal is under stress, while the other side is under stress. If there is a gap between the dark stripe of the belt and the supporting wheel, and the area of the dark stripe is large, the bearing bush of the supporting wheel will generate heat.
  6. Temperature rise of bearing bush caused by large clearance between wheel belt and cylinder base plate. When the wear of the wheel belt and the cylinder base plate is serious and the gap between the wheel belt and the base plate is too large, the deformation ovality of the wheel belt increases. When the ovality of the wheel belt exceeds a certain value, it is easy to cause the heat of the supporting wheel bearing shell. At the same time, when the gap between the wheel belt and the cylinder base plate is too large, the contact surface between the two ends of the wheel belt and the supporting wheel changes, resulting in the uneven stress on the bearing pads on both sides of the supporting wheel, resulting in the bearing pad heating.
  7. The bearing bush heating caused by the running time of the hydraulic stop wheel. When the up speed of the hydraulic stop wheel is slow and uneven, and the down speed is too fast, a downward axial thrust is formed, which can also cause relative setback and friction between the supporting axle and the pad. When the contact clearance between a supporting wheel thrust plate and the end of the bearing bush is small, the bearing bush will be heated.
  8. The large radial temperature difference on the surface of kiln shell causes the heating of bearing bush. If the radial temperature difference of kiln is too large, the kiln will deform when it is over 100 ℃. When the cross-section of the cylinder is similar to that of the egg, it will cause the bearing shell of the supporting wheel to heat up.
  9. The relative deviation between the kiln center line and the supporting wheel axis causes the bearing bush to heat up. If there is a deviation between the kiln center line and a supporting wheel, when there is a positive “eight” or an inverted “eight”, when the rotary kiln cylinder is in the up or down direction, the supporting wheel with a deviation of the wheel belt pair will produce a larger axial force, which will cause the axial displacement of the supporting axle relative to the bearing, make the movement of the shaft appear radial rotation and axial movement, and break the original contact surface of the bearing bush, so as to Cause the surface of the supporting wheel bearing bush to heat up and produce wire drawing.

The heating problem of the bearing bush of the rotary kiln is the most common problem in the operation of the rotary kiln, and also the most annoying problem. There are many reasons for this, and there are many ways to deal with it. The correct choice of lubricating oil can not only avoid the heating phenomenon of the roller bearing bush and protect other equipment to the maximum extent, but also extend the use time of lubricating oil and save cost.

NSK Pillow block bearing units for industry application

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Pillow block, also named plummer block or bearing housing, different brand called different name for this industrial part. Europe bearing manufacturer call Plummer block, FAG named Plummer block and pillow block, NSK and NTN say Pillow block, it is a pedestal used to provide support for a rotating shaft with the help of compatible bearings & various accessorie s,the pillow block housing material is typically made of cast iron or cast steel.

Pillow blocks usually refer to housings which have a bearing fitted into them and thus the user need not purchase the bearings separately. Pillow blocks are usually mounted in cleaner environments and generally are meant for lesser loads of general industry. These differ from “plummer blocks” which are bearing housings supplied without any bearings and are usually meant for higher load ratings and corrosive industrial environments.

However the terms NSK Pillow block bearing units and plummer block are used interchangeably in certain parts of the world.

Pillow block bearing usually working with pillow block housing, FAG UC200, UC300 Series pillow block bearing, NSK UC series NSK Pillow block bearing units,

and also some bearings working with plummer blocks like spherical roller bearings, self-aligning ball bearing, cylindrical roller bearings, deep groove ball bearings, Carb Toroidal roller bearing, The fundamental application of both types is the same which is to mount bearings safely enabling their outer ring to be stationary while allowing rotation of the inner ring. The housing is bolted to a foundation through the holes in the base. Bearing housings are either split type or unsplit type. Split type housings are usually two piece housings where the cap and base can be detached, while certain series are one single piece housings. Various seals are provided to prevent dust and other contaminants from entering the housing. Thus the housing provides a clean environment for the expensive bearings to freely rotate, hence increasing their performance and duty cycle.

Bearing housings are usually made of grey cast iron. However various grades of metals can be used to manufacture the same.

NSK Pillow blocks are completely interchangeable with SKF Plummer block housing, FAG plummer block bearing housings, NTN pillow block housings, Now let me show some applications of NSK Plummer blocks.

General industry:  Conveyors, Roller tables, Fans and blowers

Processing industry: Crushers, hammer mills, Ball and rod mills, decanters, Kilns

Paper making equipments: Dryer cans, jack ladders, chip conveyers, pumps, pulpers, breast rolls, press rolls

Steel mills: Runout tables, strip processing lines

Part numbering system of NSK plummer blocks

SAF: Two or four bolt pillow block, cast iron

SDAF: Four bolt heavy duty type pillow block, cast iron

SAFS: Two or four bolt pillow block, cast steel

FSAF: Four bolt pillow bl ock, cast iron

FSAFS: Four bolt pillow block, cast steel

SDAFS: Four bolt heavy duty pillow block, cast steel

 

XRB (China bearing supplier) Supply complete NSK pillow block bearing units, pillow blocks, pillow block bearin gs,plummer block housings, as well as NTN,  FAG, INA, FK, ASAHI, FYH brand, MOQ is 1 pcs, we can ship the goods by DHL, TNT, fedex, we transport the big quantity by air. which total weight heavier than 100kg, and More than 1000kg will be by sea.

Electric Motor bearing Application and Installation

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Electric Motor bearing, also known as motor bearing or electrical motor bearing, is a special bearing applied to motor. The bearing used by the motor is a part that supports the shaft, it can guide the rotation of the shaft, and can also withstand the idle components on the shaft.

There are four types of bearings commonly used in motors, namely:

— Rolling bearings,

— Sliding bearings,

— Joint bearings( spherical plain bearing)

— Oil bearings.

The most common motor bearings are rolling bearings, that is, bearings with rolling elements.

— Deep groove ball bearing

— Cylindrical roller bearing

— Insulated bearing

— Hybrid bearings

— Angular contact ball bearings

— Spherical roller bearings

— CARB toroidal roller bearings

— Spherical roller thrust bearings

Operation principle of the Motor Bearing

Motor bearings use smooth metal balls or rollers and lubricated inner and outer ring metal surfaces to reduce friction. These balls or rollers “carry” the load and support the motor shaft so that the motor (rotor) can rotate smoothly.

Electric Bearing Type

— Most small and medium motors use rolling bearings.

— Large and medium-sized motors also use rolling bearings.

— Ball bearings (such as deep groove ball bearings) are used for bearings at both ends of small motors.

— Medium-sized motors use roller bearings at the load end (such as cylindrical roller bearings and tapered roller bearings. Generally used for high load conditions), and non-load ends use ball bearings (but there are also opposite cases, such as 1050kW motors). Rolling bearings are lubricated with grease, but they are also lubricated with lubricating oil.

Bearing Installation

The quality of the Electric Motor bearing installation will directly affect the accuracy, life and performance of the bearing. Therefore, please fully study the bearing installation, that is, please install the motor bearing in accordance with the operating standards including the following items:

1. Clean the motor bearings and related parts. Oil-lubricated bearings and oil seals or dust caps on both sides of the grease-lubricated bearings are not required before the seal ring bearings are installed.

2. Check the size and finishing of related parts

Installation Method:

The installation of the motor bearing should be based on the bearing structure, size and the matching nature of the bearing components. The pressure should be directly applied to the end surface of the tightly fitting ring, and the pressure should not be transmitted through the rolling element. The motor bearing installation generally adopts the following methods:

  1. Press fit

When the inner ring of the motor bearing is tightly matched with the shaft, and the outer ring is loosely fitted with the bearing seat hole, the motor bearing can be pressed on the shaft with a press, and then the shaft and the bearing are installed into the bearing seat hole together. At the end face of the inner ring of the motor bearing, a soft metal material assembly sleeve (copper or mild steel) is placed.

When the outer ring of the motor bearing fits tightly with the hole of the bearing seat, when the inner ring is loosely fitted with the shaft, the motor bearing can be pressed into the hole of the bearing seat first, then the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole.

If the bearing ring of the motor is tightly matched with the shaft and the seat hole, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time during installation. The structure of the assembly sleeve should be able to press the end surfaces of the inner and outer rings of the bearing .

  1. Heating coordination

By heating the motor bearing or bearing seat, the thermal expansion is used to transform the tight fit into a loose fit installation method. It is a common and labor-saving installation method.

This method is suitable for the installation of motor bearings with a large interference. Before hot assembly, put the bearing ring of the motor bearing or the separable bearing in the oil tank and heat it evenly at 80-100 ℃, then remove it from the oil and install it on the shaft as soon as possible. In order to prevent the end face of the inner ring and the shaft shoulder from being tight after cooling, the motor bearing can be axially tightened after cooling. When the outer ring of the motor bearing is tightly matched with the bearing seat made of light metal, the hot-fitting method of heating the bearing seat can be used to avoid scratches on the mating surface.

When heating the motor bearing with an oil tank, there should be a grid at a certain distance from the bottom of the tank, or use a hook to hang the motor bearing. The motor bearing cannot be placed on the bottom of the tank to prevent sunken impurities from entering the motor bearing or uneven heating. There must be a thermometer, and the oil temperature must be strictly controlled not to exceed 100 ° C to prevent the tempering effect and reduce the hardness of the ferrule.

China Bearing for Agricultural Machinery

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Agricultural machinery bearing is an important basic component of agricultural machinery equipment. It is widely used in agricultural vehicles, tractors, diesel engines, electric motors, rakes, balers, harvesters, threshers and other agricultural machinery. Its accuracy, performance, life and Reliability plays a decisive role in the accuracy, performance, life and reliability of the host. Agricultural machinery bearings must be able to operate in extremely challenging conditions, adapting from dry and abrasive environments to wet, corrosive, and highly polluted environments. They need to meet the requirements of long life and durability under heavy load conditions, so as to solve the farm The masters reduce the downtime and maintenance costs, and increase the output as much as possible.

Regardless of the particularity of the weather or crop harvest, the use of reliable and durable parts is a key factor in the proper maintenance of agricultural machinery and the timely harvest of crops all over the world.

Characteristics of agricultural machinery bearings

  1. Can sustain continuous vibration and high impact load;
  2. Tight and high-precision seal design, satisfying reliable operation under various weather conditions
  3. Low-maintenance or maintenance-free design;
  4. Easy to install, can provide the whole unit;
  5. The structure design is very simple;
  6. Ensure the efficient utilization of the machine

There are many types of equipment in agricultural machinery. The occasions and uses are different, so the bearings type will be different. The commonly used bearings in agricultural machinery are: agricultural machinery ball bearings (round hole, square hole or hexagonal hole, lock ring, relubrication Oil holes or nozzles), mounted ball bearings, tapered roller bearings, etc.

Tillage and seeding machinery

The high humidity in spring and autumn is a real test for agricultural farming. The hard soil quality tests the ultimate strength of all mechanical parts, which requires stronger load capacity of the bearings of the farming machine.

Tillage machinery bearings are usually integrated with flanged housings to simplify assembly. If the plow disc is connected to the bearing and has a certain inclination angle to the plow surface installation, the bearing needs to bear the lateral load, tilting moment and radial load.

Products used in farming machinery include pillow block bearings and housing units, deep groove ball bearings and angular contact ball bearings, tapered roller bearings, hexagonal and square bore bearings, and transmission chains.

Tractor machine

Gearbox bearings and components

With larger radial and axial loads, tapered roller bearings are particularly suitable for gearboxes.

Tapered roller bearings are suitable for hydraulic motors, hydraulic pumps, small bevel gear shaft support and rear axle drive integrated with the gearbox

Engine components and systems

In tractor engine applications, belt drive components, tensioning wheels and generator override pulleys, pump and fan bearings, and needle roller cage assemblies for linkages.

Harvesting Machines

In agricultural engineering applications, The seals are very important for rolling bearings. A good seal has two important functions: maintaining high-quality grease inside the bearing and preventing contaminants and moisture from entering the bearing. Efficient sealing increases the service life of bearings, and also extends the working life of agricultural machinery.

Mounted ball bearings are mainly used in harvesting machinery in the field of agricultural machinery. Mounted ball bearings and housing units are easy to install and can compensate shaft misalignment within a certain range.

CoatMaster (China Bearing Manufacturer) supply perfect service can earn customers’ trust and make sure the customers have no risk to do business with us. Before place an order, we make sure the customer know the details about the quality, the price, the delivery, and also we will be work strictly according to our agreement, after the customers received our quality bearings, we accepted return back the bearing goods if the customers was not pleased the bearing quality. Some special bearings which are not in our stock, its pleasure to ordered after confirmed the quantity and brand needed, we would like to strive our best to meet customers’ demand. So why not try to contact with us if you have demand about bearings?  And Start our first step to know each other.

Comparison between China High precision Bearing and World Top Quality

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Bearings are almost everywhere in our life, from shared bicycles on the side of the road, household appliances at home, to spaceships in the sky, aircraft carriers in the water, all of which can’t exist without bearings. However, the main bearing used in high-precision machinery is still in a blank in technology in China. The accuracy of rolling bearing is generally divided into P0, P6, P5, P4 and P2. The accuracy of bearing used on the spindle of precision machine tool shall be P5 or higher.

For high-speed, railway, aviation and other high-tech fields such as CNC machine tools and machining centers, P4 and above ultra precision bearings are required to be selected. P4 and above ultra precision bearings have high requirements for technical performance and reliability, and more than half of domestic demand depends on SKF,FAG, NSK,NTN,GRW,HQW,TIMKEN Etc.

The main reasons for the large quality gap between China’s bearing and the world’s top bearing are as follows:

1.. Quality difference of bearing finished products

A large number of tests at home and abroad show that: the machining quality of cage, ferrule and ball has different degrees of influence on bearing vibration, of which the machining quality of ball has the most obvious influence on bearing vibration, followed by the machining quality of ferrule, and the main influencing factors are the roundness, waviness, surface roughness, surface bruise, etc. of ball and ferrule.

The most prominent problem of steel ball products in China is that the vibration value is discrete, and the surface defects are serious (single point, group point, pit, etc.). Although the surface roughness, size, shape, and error are not lower than the level outside the circle, the vibration value of the bearing after the sleeve is high and even produces abnormal noise. The main problem is that the waviness is not controlled (no standard, no suitable test and analysis instrument). At the same time, the machine tool’s On the other hand, the management level should be improved to avoid random quality problems such as bump, scratch and burn. For the rings, the most serious influence on bearing vibration is the channel waviness and surface roughness. For example, when the roundness of the inner and outer raceways of medium and small deep groove ball bearings is greater than 2 μm, it will have a significant impact on the bearing vibration. When the waviness of the inner and outer raceways is greater than 0.7 μm, the vibration value of the bearing increases with the increase of the waviness. Serious gouges can increase the vibration by more than 4dB, or even cause abnormal noise.

 

Distance between production process and talents

  1. Industrial technology gap.

The social status of bearing technicians and even engineers is not respected as they should be (this situation has changed a lot in recent years). China’s education industry is developing unevenly, and technical education has not been given due attention, which leads to young people prefer to be white-collar workers and not willing to work in the production line. At the same time, it has also led to the entrepreneurship of everyone in China. Most of the small micro bearing factories and bearing companies have no high-quality technical personnel and can only produce some low-end bearing products without competitiveness.

  1. Material gap.

The world steel looks at China, the Chinese steel looks at Hebei, but this only refers to the crude steel production, which is also a reason why the world economy has declined in recent years, the domestic steel production capacity is over, and the steel price has been depressed. Alloy steel has always been the short plate of domestic steel industry, high-end metallurgical technology is strictly confidential to us in developed countries, coupled with the lack of research and development of domestic steel enterprises, resulting in the congenital shortage of bearing and even industrial technology in China.

  1. Production process gap.

Here, I will only talk about my own ideas. Production technology is the most important link in industrial technology, which is a process of cyclic, quantitative change and qualitative change. Taking machine tools as an example, bearings have a huge impact on the accuracy of machine tools. The main customer group of high-end precision bearings is machine tool spindle bearings. However, there is a huge gap between the life and accuracy of China precision bearings and world class top quality bearings.

  1. Production equipment gap.

Bearing manufacturers and application manufacturers are the relationship between fish and water. Without good bearings, no good equipment can be produced, and no reliable machine tool can produce high-quality bearings. As far as I know, most of the large-scale machining manufacturers purchase imported machine tools. However, some smaller domestic bearing manufacturers prefer to purchase the old-fashioned machine tools of the last century to transform them into special machine tools for bearing processing, rather than purchase the machine tools of domestic famous brands. There are price factors and practical factors.

  1. There are no strong supporters.

In recent years, China’s high-speed rail technology has developed rapidly, but high-speed railway bearings are purchased from Schaeffler Group. The basic reason is that under the control of some leaders, the northwest bearing factory began to cooperate with Schaeffler. However, in the course of several years’ cooperation, the northwest bearing factory has not received the technical support and lost a lot of market share, resulting in the decline of the northwest bearing today.

Blank of high end bearing application

Compared with foreign countries, there is a big gap between domestic bearings in high-end and large-scale bearings. The main industries are:

  1. Aviation

As a key basic component of aeroengine, the second generation aeroengine bearing with thrust ratio of 15-20 is being developed abroad, which is ready to be assembled into the fifth generation fighter around 2020. In the past 10 years, the second generation of bearing steel for Aeroengine has been developed in the United States. The representative steel types are css-42l bearing steel with high strength and corrosion resistance at 500 ℃ and x30 bearing steel with high nitrogen and rust resistance at 350 ℃ (cronidur30). China is developing the second generation of bearing for aeroengine.

  1. Automobile

For automobile hub bearings, the first and second generation hub bearings (ball bearings) are widely used in China, while the third generation hub bearings have been widely used in Europe. The main advantages of the third generation hub bearing are reliability, short payload spacing, easy installation, no adjustment, compact structure, etc. At present, most of the imported models in China use this lightweight and integrated structure hub bearing.

  1. Railway vehicles

At present, the bearings for heavy-duty trains in China are made of domestic electroslag remelting G20 crni2moa carburizing steel, while foreign countries have applied the vacuum degassing smelting technology, inclusion homogenization technology (IQ steel), ultra long life Steel Technology (TF steel), fine heat treatment technology, surface super hardening treatment technology and advanced seal lubrication technology to bearings Therefore, the service life and reliability of the bearing are greatly improved. China’s electroslag bearing steel is not only of low quality, but also has a higher cost of 2000-3000 yuan / ton than the vacuum degassing steel. In the future, China needs to develop ultra-high purity, fine quality, homogenization and stable quality vacuum degassing bearing steel to replace the current electroslag bearing steel.

  1. Wind power energy

For wind turbine bearings, at present, China is unable to produce spindle bearings and booster bearings with high technology content, which are basically imported. The localization of supporting bearings for wind turbine units above 3MW has not been solved. In order to improve the strength, toughness and service life of wind power bearing, a new type of special heat treatment steel SHX (40crsimo) is used in foreign countries. For yaw and variable slurry bearing, the depth of hardened layer, surface hardness, soft band width and surface crack are controlled by surface induction quenching heat treatment.

For the speed increaser bearing and the main shaft bearing, the use of Carbonitriding makes the surface of the parts get more stable retained austenite volume fraction (30% – 35%) and a large number of fine carbides and carbonitrides, which improves the service life of the bearing under the condition of polluted lubrication.

Improvement direction of China bearings in the future

The improvement is mainly reflected in four aspects:

  1. Cleanliness of bearing steel

On the premise of economy, the cleanliness of steel is further improved, the content of oxygen and titanium in steel is reduced, the content of oxygen and titanium in bearing steel is less than 6 × 10-6 and 15 × 10-6 respectively, the content and size of inclusions in steel are reduced, and the distribution uniformity is improved.

  1. Organization refinement and equalization

Through the application of alloying design and controlled rolling and controlled cooling process, the homogeneity of inclusions and carbides can be further improved, the network and ribbon carbides can be reduced and eliminated, the average size and maximum particle size can be reduced, and the average size of carbides can be less than 1 μ m; the grain size of matrix structure can be further improved, and the grain size of bearing steel can be further refined.

  1. Reduce macrostructure defects

Furthermore, the center porosity, center shrinkage and center component segregation in bearing steel are further reduced, and the uniformity of low power structure is improved.

  1. Toughness of bearing steel

The toughness of bearing steel is improved through the study of new alloying, hot rolling process optimization and heat treatment process.

Although domestic bearings and imported bearings have many gaps, but after the continuous development of the Chinese people are sure to develop more high-quality bearing products, there will be many excellent bearing enterprises.

In December 2013, “Jade Rabbit” successfully landed on the moon, which is the dream of China for many years and carries the painstaking efforts of many Chinese people. While we are feeling and excited, we can not forget the scientific researchers and enterprises who are quietly dedicated to the development of national science and technology. We may not know that the successful development and operation of the “Jade Rabbit” depends on our domestic Luoyang bearing, not imported bearing, which is of great significance. This means that the gap between domestic and imported bearings is becoming smaller and smaller, and the domestic technology is getting closer to the international high standard level, even in some technologies, it is still in a leading position. For some ordinary machines, the level of bearing may not be high, but the requirement for “Yutu” to jump on the moon is very high, it needs to bear the extremely cold and hot environment, and it also needs to operate flexibly, which is really a great test for domestic bearings, but it is gratifying that the domestic bearings are fully competent and completed very well Color. Although domestic bearings have only developed for several decades and have little advantage over foreign ones in the history of hundreds of years, they can catch up with each other in such a short time. We can only use one idiom to summarize, that is, the waves behind the Yangtze River push the waves ahead.