INA overall eccentric arm bearing maintenance performance cautious inspection method

If the INA bearing can be used correctly if it is not selected correctly, it can be used for a long time before the service life of the whole eccentric arm bearing. On the other hand, there is an accidental early damage, and the early damage that cannot be used can be used as The reason for this early damage is that there is not enough consideration for the use of lubrication, and there are also foreign matter intrusion, the error of bearing assembly and the deflection of the shaft are large, and the research on the shaft and the bearing housing is insufficient. It can be said that these reasons overlap each other.
A comparative study of the design life of various machines and various durable overall eccentric arm bearing bearings is used, while determining the bearing size. In the selection of bearings, INA bearings tend to think that the grease life in aging, the fatigue life of the grease, wear resistance, and low noise also need to be fully studied.
In addition, depending on the application, it is necessary to select bearings for special requirements in terms of precision, clearance, cage structure, grease, etc. However, there is no order in selecting INA bearings. Rules, priority should be given to the conditions, performance, and related matters required for the overall eccentric arm bearing, especially for practical use. As long as the bearings are kept as intact as possible.
Cleaning of the bearing: Remove the bearing repair, first record the appearance of the bearing, confirm the remaining amount of lubricant, use the lubricant after sampling inspection, and clean the bearing. As a cleaning agent, gasoline and kerosene are generally used. Remove the entire eccentric arm bearing cleaning, cleaning and fine cleaning of the thick, placed in the container, put the first metal mesh bottom, so that the container does not directly contact the dirt of the bearing.
INA bearing inspection and judgment: to determine whether it can be used for cleaning the bearing to remove the bearing.
Check raceways, raceways, surface conditions, cage wear, bearing clearance and dimensional accuracy improvements, irrelevant damage, and anomalies. Non-separable small ball bearing, bearing inner ring, with one hand support level, rotating outer ring confirmed smoothly.
Therefore, it is necessary to fully understand the machine used in the bearing, the conditions of use, and the structure of the outer eccentric arm bearing. If the situation before and after the accident can be clarified, then the damage of the INA bearing and various reasons can be investigated. It can prevent the recurrence of similar accidents

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Regular inspection method for NTN thrust ball bearing lubricant

The choice of NTN bearing grease is directly related to the stable operation of the equipment. In order to better play the best condition of the bearing, the following are several important factors for selecting the grease: mechanical type; type and size of thrust ball bearing; working temperature Workload conditions; speed range; working conditions, such as vibration and the direction of the main shaft are horizontal or vertical; cooling; sealing effect; peripheral environment.
Apply a little bit of lubricant to the friction between the two fingers. If there is any contaminant, it can be felt. Or apply a lubricant on the back of the hand and then check the light.
Thrust ball bearings lubricated with oil should be refilled with fresh oil and allowed to rotate at low speed for a few minutes if the old oil is drained. As much as possible, allow the oil to collect residual contaminants and then vent the oil. Note: It is best to filter the oil before use.
1) Bearing design parameters: including the number of bearing rolling elements, ferrule wall thickness and clearance.
2) Manufacturing error of bearing parts: including NTN bearing raceway and rolling element surface roughness, ridge degree and roundness difference. A large number of experimental studies have shown that the influence of waviness on bearing vibration is dominant, while the influence of surface roughness and roundness is relatively small.
3) Bearing working conditions: During the operation of the thrust ball bearing, the load, speed and lubrication conditions have the greatest influence on the bearing vibration.
4) Bearing installation parameters: the bearing and the shaft and the bearing seat, the deflection during installation and other factors also affect the vibration of the bearing.
The use of grease-lubricated thrust ball bearings in the replacement of grease, the use of the cutter should avoid the contact of cotton with any part of the NTN bearing. Since these residual fibers may be wedged between the rolling elements and cause damage, especially the application of small bearings requires attention to this problem.
When inspecting NTN bearings, never expose the thrust ball bearings to contaminants or moisture. If the work is interrupted, cover the machine with a piece of oil-paper plastic or similar material.

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Maintenance of INA bearings on the pump

     Many of the maintenance of INA bearings are the same, but each industry has different maintenance. Today I will introduce the maintenance of the INA bearing on the pump.
(1) The pump that is newly put into use must be replaced with grease (oil) after 100 hours of operation, and then replaced once every 500 hours.
(2) Flow INA bearing lubricated with grease. After 1500 hours of operation, the grease should be replaced. The amount of oil to be filled should not be too much or too little, because too much or too little grease will cause the INA bearing to heat up. Generally, it is suitable to hold 1/2 to 2/3 of the volume of the INA bearing chamber.
(3) For INA bearings lubricated with lubricating oil, the amount of oil should be added to the specified position.
(4) The container containing lubricating oil or grease should be clean and should be sealed properly. There should be no dust, iron filings and other debris to avoid damage to the INA bearing.
(5) Motor INA bearings generally use sodium-based grease, which is characterized by high temperature resistance (125 ° C), but is easy to dissolve in water, so it can not be used for lubrication of pump INA bearings.

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Imported bearing storage and storage methods

     Precautions for use
Rolling inlet bearings are more accurate than general mechanical parts, so care should be taken when using them.
1) Keep the imported bearings and their surroundings clean
2) Careful and careful when using
If used carelessly, the imported bearings will have strong impact, which will cause injuries, indentations, breaks and other injuries on the imported bearings.
3) Use the right tools
4) Pay attention to the rust prevention of imported bearings
Avoid using it in wet areas, and wear gloves if you don't get sweat on it.
5) Users should be familiar with imported bearings
6) Formulate operational specifications for the use of imported bearings
a, the preservation of imported bearings
b. Cleaning of imported bearings and their surroundings
c. Inspection of the size and processing quality of the installation site
d, installation work
e, post-installation check
f, disassembly work {TodayHot}
g, maintenance (regular inspection)
h, lubricant supplement
Storage of imported bearings
Imported bearings are coated with an appropriate amount of anti-rust oil at the factory and packed with anti-rust paper. As long as the package is not damaged, the quality of the imported bearings will be guaranteed.
However, for long-term storage, it is recommended to store on a shelf 30cm above the ground at a temperature below 65% and a temperature of about 20 degrees Celsius. In addition, the storage place should avoid direct sunlight or contact with cold walls.

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Ways to control the effects of bearing noise

   Generally speaking, in order to control the noise influence of the rolling bearing, it is necessary to take countermeasures against the root cause of these noises in order to receive the effect of the root cause. The main route is:

(1) Select low noise bearings;

(2) Try to eliminate noise from the application of the bearing,

(3) Avoid resonance with the host and avoid resonance sensitive speed;

(4) When other methods are ineffective, take additional measures for sound insulation and noise reduction.

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Common sliding NSK bearing failures

Sliding NSK bearings NSK bearings that work under sliding friction. The sliding NSK bearing works smoothly, reliably and without noise. Under liquid lubrication conditions, the sliding surface is separated by the lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced, and the oil film also has a certain vibration absorbing capability. The use of sliding NSK bearings is also very versatile. How can we solve the problem of the occurrence of sliding NSK bearings? What better way? Let me explain the relevant knowledge to you, I hope to help you.
Common faults in sliding NSK bearings are as follows:
1, tile surface corrosion: spectral analysis found that the concentration of non-ferrous metal elements is abnormal; there are many sub-micron wear particles of non-ferrous metal components in the iron spectrum; lubricating oil moisture exceeds the standard, acid value exceeds the standard.
2. NSK imported bearing journal surface strain: iron spectrum cutting abrasive grains or black oxide particles in the iron spectrum, tempering color on the metal surface.
3, NSK bearing journal surface corrosion: Spectral analysis found that the concentration of iron is abnormal, there are many sub-micron particles of iron in the iron spectrum, the lubricating oil exceeds the standard or the acid value exceeds the standard.
4, NSK bearing surface strain: found in the iron spectrum cutting abrasive particles, abrasive particles are non-ferrous metals.
5, fretting wear behind the tile: spectral analysis found that the iron concentration is abnormal, there are many iron components in the iron spectrum sub-micron wear particles, lubricating oil moisture and acid value is abnormal.

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Calculation method of rolling bearing fault frequency

Rolling bearing outer ring fault frequency: BPFOr≌0.4Nn
Rolling bearing inner ring fault frequency: BPFIr≌0.6Nn
Rolling bearing cage failure frequency: FTFr≌0.4N

The above symbols:

n = number of rolling elements.
N = speed of the shaft.

Note: 1. The rolling bearing does not slide; 2. The rolling bearing geometry does not change; 3. The bearing outer ring is fixed and does not rotate.

Rolling bearing outer ring fault frequency: BPFOe≌N (0.5n-1.2)
Rolling bearing inner ring fault frequency: BPFIe≌N (0.5n+1.2)
Rolling bearing rolling element failure frequency: BSFe≌N (0.2n-1.2/n)
Rolling bearing cage failure frequency: FTFe≌N (0.5-1.2/n)

The above symbols:

n = number of rolling elements.
N = speed of the shaft.

Note: 1. The rolling bearing does not slide; 2. The rolling bearing geometry does not change; 3. The bearing outer ring is fixed and does not rotate.

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How to choose oil according to the Dn value of the rolling bearing

The recommended oil viscosity according to dn value / temperature is as follows:

Dn value <10000mm.r/min, oil viscosity 60mm2/s for bearing working temperature 0-30°C, suitable oil 37.8°C viscosity 115mm2/s at 30-60°C, suitable viscosity 37.8°C at 60-90°C 360mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 750mm2 / s;

The dn value is 10000-25000mm.r/min, the oil viscosity is 35mm2/s when the bearing working temperature is 0-30°C, the applicable oil is 37.8°C viscosity 95mm2/s at 30-60°C, and the applicable oil is 37.8°C at 60-90°C. Viscosity 270mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 550mm2 / s;

The dn value is 25000-60000mm.r/min, the oil viscosity is 35mm2/s when the bearing working temperature is 0-30°C, the applicable oil is 37.8°C viscosity 70mm2/s at 30-60°C, and the applicable oil is 37.8°C at 60-90°C. Viscosity 270mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 550mm2 / s;

Dn value is 60000-75000mm.r/min, oil viscosity is 20mm2/s when bearing working temperature is 0-30°C, suitable viscosity is 37.8°C 60mm2/s at 30-60°C, and suitable oil is 37.8°C at 60-90°C Viscosity 220mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 360mm2 / s;

Dn value is 75000-100000mm.r/min, oil viscosity is 20mm2/s when bearing working temperature is 0-30°C, viscosity is 60wt2/s at 30-60°C, viscosity is 60mm2/s at 60-90°C, and suitable oil is 37.8°C at 60-90°C Viscosity 160mm2 / s, suitable oil at 30-120 ° C 37.8 ° C viscosity 3600mm2 / s;

Dn value 100000-250000mm.r/min, oil viscosity 9mm2/s for bearing working temperature 0-30°C, 37.8°C viscosity 35mm2/s for 30-60°C, 37.8°C for oil at 60-90°C Viscosity 115mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 270mm2 / s;

Dn value is more than 250,000 mm.r/min, oil viscosity is 9mm2/s when the bearing working temperature is 0-30°C, 37.8°C viscosity is 35mm2/s at 30-60°C, and suitable oil is 37.8°C at 60-90°C. The viscosity is 95 mm 2 /s, and the applicable oil at 90-120 ° C is 37.8 ° C viscosity 270 mm 2 / s.

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How to maintain the water pump bearing

(1) The pump that is newly put into use must be replaced with grease (oil) after 100 hours of operation, and then replaced once every 500 hours.

     (2) Lubricating grease-lubricated flow bearings should be replaced after 1500 hours of operation. The amount of oil to be filled should not be too much or too little, because too much or too little grease will cause the bearing to heat up. It is preferably 1/2 to 2/3 of the volume of the bearing chamber.

     (3) For bearings lubricated with lubricating oil, the amount of oil should be added to the specified position.

     (4) The container containing lubricating oil or grease should be clean and should be sealed properly. There should be no dust, iron filings and other debris to avoid damage to the bearing.

     (5) Motor bearings generally use sodium-based grease, which is characterized by high temperature resistance (125 ° C), but is easily soluble in water, so it can not be used for lubrication of water pump bearings.

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Inspection, maintenance and maintenance of wheel bearings

Hub bearings are important moving parts for automobiles. The hub axle bears the burden of reducing the frictional resistance during the operation of the chassis and maintaining the normal driving of the car. If the hub bearing fails, it may cause noise, bearing heat, etc., especially the front wheel is more obvious, which may lead to dangerous phenomena such as out of control. Therefore, the hub bearings must be maintained on schedule.

1. Inspection of the hub bearing

(1) When checking the tightness of the hub bearing, firstly, the axle of the wheel at one end of the wheel of the car to be inspected is erected, and the vehicle is safely framed by means of a vehicle stool, a wooden cover, and the like.

(2) Turn the number of wheels to be inspected by hand to see if the rotation is stable and there is abnormal noise. If the rotation is not smooth and there is friction, the brake part is not normal; if there is no noise, the rotation is not smooth and it is loose when it is tight, indicating that the bearing part is not normal. The hub should be removed when the above abnormality occurs. For small cars, when inspecting the hub bearings, hold the upper and lower sides of the tires with both hands, and pull the tires back and forth with both hands and repeat them many times. If it is normal, there should be no feeling of looseness and blockage; if the swing has a feeling of looseness, the wheel should be removed.

(3) Inspection of the brakes. Usually when inspecting the hub bearing, check the wheel brake device. If there is oil on the inside of the tire, it may be caused by oil leakage from the brake cylinder or brake hose. The cause should be identified and eliminated.

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Surface treatment of bearings with diamond coating reduces loss

Bearings are a universal part, and only a few equipments do not use bearing designs. In most cases, bearings are found in all types of instruments and equipment systems. Surface treatment of ball and plain bearings with a diamond-type coating can greatly reduce the frictional losses of the bearing system. In advance, this diamond-type coating can be applied to plastic bearings through a special coating process to improve the durability of components and extend the life of the equipment.

    Ball bearings are often seen in the transmission section of bicycles, while plain bearings can be found in the shaft of a ship. Bearings play a vital role in many drive and brake designs. They not only work well under high-speed engines and high-heat composite conditions, but also help materials meet the requirements of some extremely demanding working environments. Diamond-type coatings The emergence of the application is very good.

    Scientists from the IWM Materials Performance Research Center in Freiburg, Germany, are actively developing new generations of bearings for the next generation. They have developed a special high-performance chemical coating for the bearings to provide a smooth surface in the bearing. Degree, reduce friction, so as to achieve the design requirements to extend the purpose of bearing use. These innovative coating products, mainly composed of diamond-type carbon (DLC), said Dr. Sven Meier, head of the research center, "The emergence of diamond-based coatings has given us a strong technology for future bearing design. Support. We are fully capable of designing new products that last longer than conventional bearings. The bearing technology and applications for this new coating are still under development, and we envisage that this product can be used without lubricants. The situation can be done well."

    Of course, the surface treatment of diamond coatings on bearings also requires special coating processes, and IWM scientists have also completed the development of this process. Meier went on to say, “Our coating method can be used for surface treatment of complex geometric components such as bearing cages.” Engineers are currently optimizing this technology to achieve low-coat thickness performance. Application requirements, it is reported that IWM plans to control the coating thickness below 20 microns. “Our process ensures the coating service requirements for micron-sized coating structures. At this size, the coating can completely replace traditional lubricants or lubricants to minimize system friction. Special requirements can also create super smooth material surfaces."

    Currently, researchers are further developing coating coating processes to ensure they meet the specific requirements of different sizes and shapes. IWM's goal is to reduce the high cost of existing bearing processing by optimizing the process, thereby reducing the cost of enterprise equipment procurement and equipment maintenance.

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