Self-aligning bearing assembly process

needle roller bearings‍ ‍the assembly process

(1) ring demagnetization, cleaning. bearing assembly process is as follows:

(2) sorting the outer raceway size deviation.

(3) divided into the inner stain size deviation.

(4) the holder is arranged on the inner ridicule and arranged two column ball, symmetric less loaded two balls.

(5) the inner components on the outer ring of sets.

(6) check clearance.

(7) the supplementation of two steel balls.

(8) appearance inspection, finished product inspection rotation flexibility.

(9) the demagnetization, cleaning, dehydration, drying.single direction thrust ball bearing‍

(10) oil, packaging.‍

Causes and failure analysis of the bearing failure of bearing lubrication

Bearing lubrication is important for normal bearing, must strictly control the use of lubrication conditions in order to guarantee the precision bearing and stable life. Cause 

the failure of bearing lubrication are mainly in the following aspects, this paper focuses on the analysis of.

1.... interrupt bearing oil supply system: the majority of ball bearings and roller bearing failure is due to the bearing lubricant interrupt, or lubricating mechanism can not 

effectively lubricant properly transported to the roller and raceway contact area; in order to engine failure fatal fault aviation engine main shaft bearing, retainer after 

silver ball handling and the roller in the lubricant, temporary interruption, some silver will be transferred to the raceway, add lubrication to provide low coefficient of 

friction; friction coefficient ceramic ball and roller combined bearing is better than the low friction coefficient of bearing steel. Cross roller bearings

2 thermal imbalance: at the height of the bearing in operation, the rolling body, ferrule, maintain the temperature difference between the frame must be strictly controlled, to 

avoid bearing radial preload is too large, it will cause the rolling elements and raceways frictional heating increased, if the outer ring of the bearing inner ring radiating 

aluminum above, will cause too much friction bearing lock; firstly causes lubricant oxidation and degradation, lubricants and lubricant friction increases blackening; 

overheating will cause parts of the surface chemical precipitation; with the increase of the temperature of the bearings, bearing rings and rolling elements of steel hardness 

will decline, spring will be reduced, resulting in plastic deformation;‍

Cross cylindrical roller bearing

Cross cylindrical roller bearing friction vibration often have a direct relationship with the grease properties. When the grease performance is not good or not clean, then prone 

to friction vibration, but also with the rolling bearing raceway machining quality, if this processing method is adopted for special precise, can better control the friction

Vibration. Crossed roller bearing vibration basically is caused by the vibration of bearing rings, and the bearing structure, rigidity, precision manufacturing, installation 

conditions and usage and other factors. If the bearing inner race with radial of the ripple of the inner ring road, outer ring rotation axis will produce radial vibration. Cross 

rolling

Corrugated bearing inner ring will not only cause the radial vibration of the outer ring, and

Also by the axial vibration of bearing outer ring, will make the axial bearings, the relative position change under axial load, therefore the thrust in the inner rotating 

cylindrical roller bearing outer ring also produced axial vibration export shaker at work, for bearing high speed rotation, because the ripples caused by moving the frequency, 

there may be equal to the rotational frequency of vibration exciter shaft, which produce

Resonance.

One, keep the bearings and the surrounding environment clean even the eyes can not see the tiny dust entering the bearing, can also increase the cross roller bearing wear, 

vibration and noise. Bearing and its peripheral accessories should be kept clean, especially the dust and dirt, tools and working environment must be kept clean.

Two, use the installation carefully do not allow powerful punch, do not allow the use of hammer percussion, direct bearing, not allowed to pass through the rolling pressure.

Installation tool three, use the appropriate, accurate as far as possible the use of special tools, the use of fabric and fiber or something to avoid.

Four, to prevent the corrosion of bearings directly by hand to take bearings, should wash hands sweat, and coated with high quality mineral oil before operation, during the 

rainy season and summer with particular attention to anti rust. However, in some special operating conditions, the bearing can have a longer life expectancy in traditional 

computing, especially in the light load conditions. These special operating conditions, when the rolling surface

(raceway and roller may cause surface damage) is a lubricating oil film to effectively separate and limit pollutants. In fact, in ideal conditions, the so-called permanent 

bearing life is possible.‍

Cross roller bearings

Cross roller bearings

1, deep groove ball bearing

Continuous groove type 1.1 structure of deep groove ball bearings on each ring has a cross-section of approximately spherical perimeter 1/3 raceway. It is mainly used to bear 

radial load, also can withstand the axial load.

1.2 in the bearing radial clearance increases, with the nature of angular contact ball bearing, the axial load bearing two directions alternating.

1.3 small friction, high speed.

1.4 has the advantages of simple structure, low manufacturing cost, easy to manufacture high precision.

1.5 general methods of stamping cage diameter greater than 200mm, the bearing or high-speed operation, the use of the car business entity retainer. Variant structure of deep 

needle roller bearingsas many as 60.

2, angular contact ball bearing

Can bear radial load and axial load, high speed, the larger the contact angle, the higher the axial bearing capacity. Single row bearings can only bear the axial load in one 

direction, in radial load, will cause additional axial force. The axial displacement of the bearing can limit shaft or shell in one direction. If quality.the installation, the 

outer ring of a bearing on the relative, the wide end of the wide face, narrow end face with narrow end. So to avoid the additional axial force, but also in the two direction of 

the shaft or shell limit in the axial clearance range. Structural change of angular contact ball bearing as many as 70.

The 2.1 contact angle is 15 °, 25 °. 40 degrees three, the larger the contact angle of the axial bearing capacity is higher. High precision and high speed bearings usually 

take 15 degrees contact angle, under the action of axial force, contact angle increases. The 2.2 is the inner or outer lock, inner, outer ring can not be separated. The outer 

ring and the inner ring heating after expansion, the rolling body, the holder assembly. Ball number ratio of deep groove ball bearing. Rated load in ball bearings in the 

largest, strong rigidity, smooth operation.

2.3 can use inner, outer mutual displacement adjustment radial clearance. Often used in pairs, and applying a pre load, in order to improve the bearing stiffness.

3, cylindrical roller bearings

3.1 roller and raceway for the line of contact, radial load capacity, suitable for heavy load and shock load.

3.2 the friction coefficient is small, suitable for high-speed, the speed limit is close to the deep groove ball bearing.

3.3 N type and NU type axial moving, can adapt to the changes due to thermal expansion and installation error of the shaft and the casing relative position, can be used as a 

free end bearing.

Use. The inner or outer ring can be separated, which is convenient for installation and disassembly. 3.4 the processing requirements of shaft and hole high, bearing inner and 

outer ring axis relative deviation after installation must strictly control, so as to avoid the contact stress concentration. Hole with 1:12 taper double row cylindrical roller 

bearings 3.5, radial clearance can be adjusted, radial rigidity is high, suitable for machine tool spindles.

The 3.6 cross roller bearings, cylindrical roller in a V shaped groove 90 degree roll surface through the isolated blocks are arranged vertically, so the cross roller bearings 

can bear radial load, axial load and torque load and multi direction load. The inner ring and the outer ring size is miniaturized, thin form is small size is close to the limit, 

and has the advantages of high rigidity, and the precision can reach P5 P4, P2. The rotary table is therefore suitable for industrial robot joint part and a rotating part, 

machining centers, precision equipment rotary table, medical equipment, calculators, military industry, IC manufacturing equipment etc..

4, the tapered roller bearing

Separation type bearings, bearings, have tapered raceway, roller is truncated. Roller and raceway for the line of contact, can bear radial and axial loads heavier, can also be 

subject to pure axial load. The larger the contact angle, the higher the axial bearing capacity. Contact line design of tapered roller should make the roller and the inner and 

the outer raceway extended to the bearing axis at the same point, in order to realize pure rolling. Tapered roller bearing the new design with the reinforced structure, roller 

diameter increases, the roller length, roller number increase, the convex roller, so that the bearing capacity and the fatigue life of bearing significantly improve. Spherical 

and conical surface contact between the roller large end face and large rib, improve the lubrication.

This kind of bearing according to the number of columns of the roller can be divided into single row, double row and four row tapered roller bearings of different structure 

types. This type of bearing is also used Inch series products

5, thrust ball bearing is separable bearing, the contact angle of 90 °, can be installed separately, only can withstand the axial load. Low speed limit. Steel ball and 

centrifugal force pushed the raceway outer, easy bruising, but not suitable for high speed operation. A one-way bearing can bear axial load, two-way two-way bearings can 

withstand axial load. Thrust ball bearing with spherical seat with adjustable mind

Can, can eliminate the influence of the installation error.

6, thrust cylindrical roller bearings are separable bearing. Can bear axial load, radial displacement of the shaft can limit. Bearing rigidity, small occupied space, the axial 

load capacity, low sensitivity to shock load. Suitable for low speed, the workplace is commonly used in the thrust ball bearings are not applicable. The installation does not 

allow the axis of the shaft and housing tilt.

7, spherical roller thrust bearing

Separation type bearings, the load line and the bearing axis to form a certain angle, axial load capacity, under axial load and can bear radial load certain. This type of 

bearings, spherical roller tilt alignment, raceway is spherical, with self-aligning properties, therefore allowing a plurality of inclined shaft. Can be used in heavy load 

situation, allowing high speed. The use of lubricating oil.

8, self-aligning ball bearing

The 8.1 outer raceway is spherical, with self-aligning properties. Because the processing installation and shaft bending causes for the bearing seat hole is not concentric with. 

Adjust the skew angle is within 3 degrees.

Small angle 8.2 bearing contact, almost invariant under the action of axial force, the axial bearing capacity is small. Mainly bear radial load, the radial load at the same 

time, can also be

A small amount of axial load, limit the speed ratio of deep groove ball bearing low.

9, four point contact ball bearing

Detachable type structure can bear radial load, two-way axial load, axial displacement can be limited in two directions, angular contact ball bearing axial space but more than 

double the size of the angular contact ball bearing occupies little single bearing can replace the front or back of the combination of portfolio. Because of double half inner 

(or outer ring), ball number, with larger bearing capacity. Four point contact ball bearing axial, radial loads applied to bear pure axial load or axial load in. Compared with 

the bearing and the other ball bearings, when

The radial clearance and axial clearance, smaller, higher limit speed. In normal working condition, the axial load bearing any direction, can form a contact angle, ball and 

inner, outer raceway each contact point, to avoid the occurrence of sliding friction contact zone. Therefore, the bearing should not be subjected to radial force and load.

10, spherical roller bearing

The outer ring raceway is a part of the spherical bearing, with internal self-aligning performance, adaptation to relative deflection of shaft and housing bore. Can bear radial 

load and shock load, but also can bear bidirectional certain axial load. The axial displacement of the bearing can limit shaft or shell in bearing axial clearance range. This 

kind of bearing structure principle and characteristics and self-aligning ball bearing the same load, the capacity and the speed limit's permission, can be interchanged. Tapered 

bore bearing by using fasteners or unloading easy axis of the folding.

11, thrust tapered roller bearing

Separation type bearings. A design of the shaft ring and ring raceway and roller rolling surface of the conical surface vertex to the center line. A one-way bearing can bear 

axial load, two-way two-way bearings can withstand axial load.

12, the needle thrust roller bearing

The roller length (L) and roller diameter (Dw) than L/Dw > 2.5 and roller diameter (Dw) < roller bearing 6mm is referred to as the needle roller bearing.

12.1 needle bearing radial size is small, but the radial load carrying capacity is very high, can not bear the axial load, use only as a free end bearing. Lightweight, 

miniaturization is beneficial to device.

Needle roller bearings without inner ring 12.2 with or without outer ring, only keep the needle assembly frame, the machining accuracy requirements, the match of the journal and 

bearing seat hole surface hardness should be the same with the bearing ring rolling.

The coefficient of friction of 12.3 needle bearing large, not suitable for high speed.‍

flanged ball bearing On the future development direction of Union

Previously, the Ministry issued the "Twelfth Five-Year Development Plan of e-commerce," presented to the 2015 turnover of China's e-commerce to break 18 trillion yuan, of which the size of B2B e-commerce transactions to more than 15 trillion yuan, online retail hand piece bearing transactions exceeded 3 trillion yuan, accounting for the proportion of total retail sales of social consumer goods than 9%. The plan also particularly important task to further promote the deployment of e-commerce development of SMEs.

On the future development direction of Union, China B2B Alliance chairman Zhang Tongming said that the future will be through the establishment of China's B2B alliance of public service platform, publishing industry sentiment index, to provide guidance for the daily wind power bearing operations of SMEs; build a service platform, standardized one-stop service thereby forming reduce costs, improve efficiency and expand effective models of the market. China B2B advertising alliance will further integrate resources industry websites, bring more revenue to the industry Web site; through cooperation with local governments, to further support outstanding sites, industrial upgrading, to provide greater support for the development of the industry Web site.

miniature ball bearings is a bearing in the field of leading online media

International market development matures in bringing new opportunities for the development of China's bearing industry at the same time, the sustainable development of the industry is also presented new challenges, in this situation, China's bearing industry must accelerate the pace of industrial transformation and upgrading, In-depth and comprehensive development of diversified to meet effective demand of the market.
Internet network marketing era has arrived, many bearing enterprises for sustainable economic development of enterprises, have fought in Internet network marketing, innovation and development in order to fit the market demand to create long-term competitive advantage of enterprises. China Bearing Network as an important base lay domestic bearing business network development in the opportunity of China's bearing industry development to flourish as the focus of the industry, by means of Internet technology and the bearing core business enterprises of various ways by Wed integrated to the strategic adjustment of the network structure and innovative service mechanism seize the opportunity to sell an integrated enterprise network services platform bearing the underpinning for the transformation and upgrading of industry provides a major force.
China Bearing is a bearing in the field of leading online media, is a product Buy, product pricing, industry information, business news and other information for the carrier bearing industry professional website. China's bearing industry currently is in a very favorable development opportunity, China Bearing will steadily boost innovation and sustainable development of China's bearing industry.

flanged ball bearing research and development to proceed in large bearings.

 the construction machinery market downturn great influence on the bearing, 1 to December, China's bearing industry sales fell 6%, profits fell 25%. But the economic crisis is also an opportunity, many companies from 2009 onwards began to abandon the low-end products, research and development to proceed in large bearings.
Will become a trend in the future manufacturing services, according to the Chinese bearing industry plan, "Twelve Five", revenue from services will account for about 25% of the main business income.
From the beginning of product mobile crane bearing development, to provide equipment, sales and service, which is a big chain. However, at present, bearing manufacturing enterprises pay more attention to this one, the lack of "playing the brand" awareness. This is also the place where we need to work the Association: to promote the strength of large enterprises to do the service, to play the brand, go to the international competition for markets and giants.
You know, at present, eight wind power bearing multinational companies in China has built 43 bearing factories that produced the original high-end bearings, now gradually extended to the end, take advantage of lower labor costs in China, together with the original brand and the domestic bearing business a direct collision. In China, more than 1,400 bearings business, but not one-known international brands, in competition with the large multinational companies, the brand has a competitive disadvantage relative profit margins will be much lower.