high speed bearing Silicon nitride ceramic bearings

Silicon nitride ceramic bearing rings and rolling silicon nitride (Si3N4) ceramic materials, the general use of RPA66-25, PEEK, PI, and phenolic cloth bakelite tubes. SiN4 system ZrO2 full ceramic bearings compared to material suitable for higher speed and load capacity, as well as suitable for higher ambient self aligning ball bearing‍ temperatures. While providing precision ceramic bearings for high-speed precision and high rigidity of the spindle, the highest manufacturing precision of P4 to UP level.

Full ceramic bearings, full complement ball

Full complement ball full ceramic bearing side with Tim ball gap, due to the use of cage-free design, you can load more than the ceramic ball bearing standard structure, thereby increasing its load capacity, also can avoid the restrictions shelf materials can be achieved by ceramic cage type full ceramic bearing corrosion and temperature effects. The series bearing suitable for high speed, the installation should pay attention to the gap surface mounted on one end does not bear the axial load.

Hybrid ceramic ball bearings

Especially silicon nitride ceramic balls ball with tower crane bearing‍ a low density, high hardness, low friction coefficient, wear-resistant, self-lubricating and rigidity characteristics, especially suitable for high-speed, high-precision and long life hybrid ceramic ball bearings rolling elements (inner and outer rings metal). General inner and outer rings bearing steel (GCr15) or stainless steel (AISI440C), ceramic balls can be used ZrO2, Si3N4, or SiC material.

miniature ball bearings Deep groove ball bearings

(Technical grade: P4, P5, P6, P0) deep groove ball bearings, the most representative of rolling bearings, widely used, can bear radial load and axial load. Suitable for high-speed, thin section angular contact bearings‍ low noise, low vibration and high temperature occasion or steel bearings can not be applied, the cold, corrosion, magnetic, non-insulated and other fields.

Aligning ball bearings

Aligning ball bearing outer ring raceway spherical, self-aligning, can add error misalignment and shaft deflection caused. Shaft and housing for generating different parts of the heart or shaft deflection and aligning parts of high temperatures, low cold, corrosive, non-magnetic insulation requirements. Note: The tilt is not more than 3 degrees.

Single row angular contact ball bearings

(Technical grade: P4, P5, P6, P0) angular contact bearings for high-speed and high-precision rotation, at high temperature, magnetic field, water and so does not affect its accuracy, and cross roller bearings‍ can withstand the synthesis load. Standard contact angle of 15 °, 30 ° and 40 °, the contact angle greater the greater the axial load capacity, the contact angle is smaller bearings can bear radial load and axial load. Generally installed in pairs taken. Please take note at the time of purchase.

Thrust ball bearings

Thrust ball bearings, with the ball rolling by washer-shaped raceway rings and the ball cage assembly components. Can withstand axial load, but can not bear radial load.‍

LYHY flanged ball bearing( Radial ball bearing

Radial ball bearing is a universal design that can withstand the load of different sizes in the high-speed movement. This type of rolling bearings by sets of precision ball and cage as well as the composition of the inner and outer rings. Which standard radial ball bearings there is a deep groove structure that can withstand the Double Row Ball Slewing Bearing‍ radial load and smaller axial load from any direction. Has a maximum load capacity of radial ball bearings mainly take radial load. This type of bearing a variety of sizes to choose from. Different configurations can be sealed to protect the internal components of rolling bearings and grease can be retained. Radial ball bearings are widely used in general industry, automotive industry, agriculture, chemical and household appliances industries.

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LYHY flanged ball bearing bearing

Fatigue life test is to maximize the full lubrication abrasion factor inhibiting the bearing load and speed, the enhancement to an enhanced fatigue life test method for outstanding bearing fatigue factors.

The calculation and test of fatigue life of bearing fatigue single direction thrust ball bearing‍ life is complementary, the two results are corresponding enough. But in reality, such as for each specific occasions, all selected Boying bearing a sufficient number of life test, to verify the selected bearing is suitable or not, this is very big in the economy, time and amount of labor, so the life test of automotive bearings only is used in a very necessary or important case, in most cases, the standard life calculation method to estimate the service life of the bearings, with a sufficient degree of dependency. To predict the fatigue life of bearing, determining the remaining life, need to understand the bearing fatigue all the failure phenomenon, so it will take a long time. However, because the rolling fatigue fatigue at the contact point under compressive stress occurs, to achieve the damage will occur great change of materials. Therefore, in addition to extend prior to material changes in surface cracked, raceway suffer chemical effect, crack cases, detection of material changes may judge the vehicle bearing fatigue. The main reason is the defect of bearing fault off the overload two elements. When the load across the material Angular contact ball bearings‍ strength and the formation of broken parts called overload fracture. The reason is mainly from the sudden overload machine fault or install. Are defects cause fracture can be bearing parts of the micro cracks, shrinkage, bubbles, large foreign things, organizations and local overheating burn defect is shock overload or violent vibration, known as the defect fracture. It should be noted that, automobile bearing is process, the materials into the factory inspection, casting and heat treatment quality control, process control and instrument for the precise analysis of the defects can be through with no, then must still strengthen control.

But in general, the failure of most overload bearing fracture usually.‍

high speed bearing Bearing clearance selection technique

Clearance is an important factor in rolling bearing can work normally, divided into the axial clearance and the radial clearance. Select the appropriate clearance, can make the load in the high speed bearing ‍ rolling body between the reasonable Double Row Ball Slewing Bearing‍ distribution; can limit axis (or shell) of the axial and radial displacement, ensure the rotating precision of shaft; the bearing work at a prescribed temperature; reduce the noise and vibration, to improve the bearing life. Therefore. In the selection of bearings, bearing clearance, must choose the appropriate.

Selection of bearing clearance, should consider the following aspects:

1, the bearing working conditions, such as load, temperature, speed etc.;

2, on the use of performance requirements (bearing rotation accuracy, friction torque, vibration, noise);

3, the bearing self aligning ball bearing‍ and the shaft and housing bore is in interference fit with the lead to reduction of bearing clearance;

4, when the inner and outer rings of bearing, the temperature difference caused reduction of bearing clearance;

5, because the expansion coefficient of shaft and housing materials of different, resulting in the decrease or increase of bearing clearance.

6, according to experience, the most suitable for ball bearing clearance work to nearly zero; roller bearing should keep a small amount of clearance. At the request of supporting rigid good parts, bearing preload has certain value. Here is particularly pointed out that, the so-called clearance refers to the bearing clearance, in the actual operating condition. There is also a play called the original wheel bearing‍ clearance, refers to the bearing without clearance. The original clearance than installation clearance. We choose to play, mainly is to choose appropriate clearance.

miniature ball bearings Regular maintenance and inspection of bearing

Play and its performance to maintain ball bearings ‍long-term to make the bearing fully, must cogent do regular maintenance (check). Double Row Ball Slewing Bearing‍ Through regular check for proper, do early detection of failure, to prevent accidents, is very important to improve the productivity and economy.

1, cleaning

Remove the bearings when the examination, using methods such as photographic appearance record. In addition, to confirm that the remaining amount of lubricant and lubricant sampling, and then cleaning bearings.

A bearing cleaning, rough cleaning and washing, and the metal frame at the bottom of the container placed on the use of.

B, rough when washing, Full complement cylindrical roller bearings‍ use the brush in the removal of grease or oil adhesion. At this point if oil bearing, attention will be due to foreign bodies such as damage the rolling surface.

C, sperm washing, slowly rotating bearings in oil, be careful.

Cleaning agents are commonly used as neutral without water diesel or kerosene, sometimes using temperature as needed, such as lye. No matter what kind of cleaning agents, are often filtered clean.

After cleaning, immediately on the bearing coating antirust oil or antirust grease.

2, examination and judgment

In order to determine the bearing removed can re-use, to check on the accuracy of rotation accuracy, internal clearance, and the mating surfaces, raceway, cage and sealing ring.

About the examination results, can be thin wall bearings‍ judged by the bearing or bearing are used in.

Criteria based on the mechanical properties and the important degree and the inspection cycle and different. If the following injury, bearings shall not be re used, must be replaced.

1) bearing parts of the fault and defect.

2) the raceway surface rolling surface stripping.‍

flanged ball bearing

Show cross spiral line traces the emergence of such traces is mainly due to the bus straight wheel of existence, bump phenomenon, Double Row Ball Slewing Bearing‍ when in grinding, the grinding wheel and the workpiece is only part of the contact, when the workpiece or the grinding wheel reciprocating motion after several times, cross spiral line and the naked eye reproduced on the workpiece performance will be observed. The helix pitch and workpiece speed, rotational speed of workpiece size, but also with the wheel axis and the guide rail is not parallel to the working table.

(a) the main reason for the formation of the spiral line

1 grinding wheel dressing is bad, not chamfered corner, without the use of cooling liquid dressing;

Track 2 table guide Other bearing‍ lubrication oil too much, cause the work station floating;

3 machine tool accuracy is not good;

4 the grinding pressure and flanged ball bearing.

(two) with the formation of the spiral line

1.V guide not good rigidity, the grinding wheel edge offset, just contact with the work surface;

2 dressing noisy round table reversing speed is not stable, the precision is not high, the grinding wheel is a slightly less edge trimming;

The 3 workpiece itself poor rigidity;

4 wheel is broken too peeled off the sand and grinding of iron deposition in the grinding wheel on the surface, this should be trimmed worm gear speed reducer‍ grinding wheel with cooling water rinse or wash clean;

5 wheel dressing is not good, local projection etc..

Analysis of causes of bearing grinding traces generated.‍

high speed bearing Judgment bearing will use again

Judgment bearing will use again, to high speed ‍bearing damage degree, the machine performance, importance, operating conditions, crane bearing‍ such as checking cycle later decided. Check the results, if it is found that the bearing damage and abnormal situation, hurt a section to find out the reason, countermeasures. In addition, the inspection results, if there are some defects in it, the bearing can not be used, need to replace new bearing.

A. inner and outer ring, rolling body cage, in which any cracks and debris.

B. inner and outer ring, Single Row Ball Slewing Bearing‍ rolling body which any split.

C. raceway, rib, rolling card significantly hurt.

D. retainer wear or loosen rivets.

E. raceway surface, rolling rust and bruises.

F. surface of rolling, rolling a significant indentation and trace.

A creep of G. inner diameter of surface or outer diameter.

H. thermal slewing rings‍ discoloration.

I. grease sealed bearings seals and shields to serious damage.‍

miniature ball bearings Analysis of deep groove ball bearing quality

 Compared with sliding bearing, deep groove ball bearing and miniature ball‍ bearing, general conditions of deep groove ball bearing, the rolling Needle Roller Bearing‍ efficiency and hydrodynamic bearing lubricated bearings, but a mixed lubrication bearing to the high number of;

1, ability to withstand the impact load is poor;

2, the radial clearance is relatively small, angular contact radial bearings can be preloaded available pretightening force to eliminate the clearance, high running precision; high speed heavy load bearing life is low;

3, for the same size of Thin section bearings‍ the shaft diameter, bearing width smaller than the sliding bearing, the axial structure of machine is compact; vibration and noise;

4, most of the rolling bearing can be both radial and axial load, so the bearing assembly has the advantages of simple structure; the radial size than the sliding bearing;

5, the consumption of lubricant, which is convenient for sealing, easy maintenance;

6, do not need useful nonferrous linear ball bearing‍ metal;

7, a high degree of standardization, mass production, low cost;‍

flanged ball bearing matching precision bearing installation.

In order to improve the matching precision bearing installation, must use the measurement methods and tools do not make the flanged ball ‍bearing deformation, high precision bearings‍ precision measurement of bearing inner and outer circle with the surface size of the actual project, the measurement can be related to the inner and outer diameters of all be measured, and make a comprehensive analysis of the measured data, the according to precision bearings, matching with the shaft and hole of installation parts. The distribution of shaft and hole in the actual measurement of the corresponding size and geometry, temperature and measurement should be carried out in the bearing under the same.

To guarantee Taper roller bearings‍ the higher actual tie effect, the shaft and hole matched with a bearing surface, the roughness should be as small as possible.

In the above measurement, should be in the outer circle and bearing inner hole, and the corresponding surface of the shaft and the seat hole, on both sides near the assembly chamfer, respectively two groups of marker can show the maximum deviation direction, so that in the actual assembly, the match two party of maximum deviation of the same orientation so, in the assembly, the deviation can be partially offset.

The purpose of making two sets of directional signs, is the deviation compensation can be considered, even supported at both ends of each rotating accuracy slewing bearing‍ improved, and between the two bearing seat hole and the trunnion coaxiality error on both ends are partially eliminated. The mating surface to surface strengthening measures, such as sandblasting, precision plunger diameter slightly larger plug a hole, are beneficial to improve matching precision. 

high speed bearing The sequential step bearing finishin

Bearing order superfinishing can generally be divided into three steps: cutting, cutting, semi finishing machining.

The first step: Bearing cutting

Convex peak surface conical bearing‍ contact surface and rough rolling stone, due to a smaller contact area, a force per unit area is larger, in certain pressure, stone first by bearing workpiece "anti cutting" role, the stone surface of abrasive loss and fragmentation, showing some new sharp grinding grain and edge. At the same time, surface asperity bearing workpiece by fast cutting, the cutting and anti cutting to remove the bearing surface of the workpiece and the grinding affected layer of convex peak. This stage is called the cutting stage, at this stage most of removed metal allowance.

The second mobile crane bearing‍ step: cutting bearing

As the process continues, bearing the workpiece surface has been polished. At this time, a contact with the workpiece surface area increased, the unit area pressure decreases, the cutting depth decreases, the cutting ability is abate. At the same time, hole stone surface is blocked, stone in the half cutting state. This stage is called semi cutting stage bearing finishing, half cutting stage cutting workpiece surface bearing traces of shallow, and the emergence of reali slim bearings‍ dark luster.

The third step: the finishing stage

This is the last step in ultra precision machining of bearing. With the workpiece surface to be gradually removed, the contact area of stone and workpiece surface is further increased, and, stone and bearing surface gradually by the lubricating oil film isolation, the force per unit area is very small, the cutting effect decreases, then automatically stop cutting. At this stage we Series super thin section bearings‍ call the finishing stage. The whole stage light surface workpiece without cutting mark, SKF bearing appears bright finished luster.

miniature ball bearings comprehensive up the following main indicators

Working temperature: 1 by low temperature limit the lowest temperature of lubricating parts should be higher than the grease, otherwise it will increase the resistance of the highest temperature should be below the temperature limit; grease, wind power bearing‍ otherwise it will lose because of grease lubrication capacity loss; the highest applicable temperature grease should be below the drop point 20 ~ 30 ℃.

2 speed: lubricating parts of the operation speed is higher, the shear stress of the lubricating grease is bigger, and the high speed dynamic mechanical temperature to rise quickly, easy to make the lubricant thinning and erosion, so we should select the consistency grease bigger.

3: according to the load miniature ball ‍bearing load is the key to ensure the selection of grease lubrication, lubrication points taper roller bearing‍ should be used for heavy load of base oil with high viscosity, thickened grease agent content is high; if can bear heavy load and shock load, should choose high extreme pressure and anti grinding grease resistance, such as the grease containing molybdenum disulfide.

4 conditions: environmental conditions refer to the work environment and the surrounding medium lubrication points, such as air humidity, dust and corrosive medium. In contact with water or damp environment condition, can choose the grease of water resistance. Such as calcium, lithium base; harsh conditions, should be used with grease and rust, but Angular contact ball bearings‍ should not use sodium base grease water resistance is poor; in the lubrication points with strong chemical medium environment, should be chemical resistant selection of fluorine element grease; in the environment with more dust, grease containing graphite thick optional; to seal with special requirements, should use sodium base grease.

5 cost factors: in the selection of grease, but also consider the economic use, comprehensive analysis using this grease is extending the lubrication cycle, charging times, self aligning bearing‍ fat consumption, bearing failure rate and repair cost.

flanged ball bearing Bearing use and coordination The use of bearing

Use the matters needing attention

Rolling bearings make precision parts, and therefore requested the use of the corresponding support cautious attitude, not only Thin section bearings‍ changing  flanged ball bearing high performance, if used improperly, can not achieve the expected performance, so, use of the bearing that should pay attention to the following items:

Keep the bearings and the surrounding environment clean. Even the eyes can not see the smile dirt into the bearing, also increase the bearing wear, vibration and noise.

Use the installation carefully, do not allow powerful punch, does not allow direct percussion bearing with a hammer, not allowed to pass through the Needle Roller Bearing‍ rolling pressure.

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

To prevent corrosion of bearings, the direct use of hands 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.

Bearings with

Coordination selection

Inner diameter and outer thin wall bearings‍ diameter of rolling bearings are manufactured according to the standard tolerance, bearing inner ring and shaft, tolerance of outer ring and the seat hole degree can only through tolerance and seat hole control shaft neck to achieve. With the bearing inner ring and shaft using the basic hole system, combined with the outer ring of the bearing seat hole of the shaft.

The correct choice of cooperation, must know the actual load conditions of bearing, the working temperature and other requirements, but in fact it is very difficult. Therefore, in most cases it is used according to the selection of fine grinding.

The size of load

The ring and the shaft or housing between crossed roller bearings‍ the win depends on the size of the load, heavy load by win larger, lighter load by winning the smaller amount.