What are the ways to control the influence 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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FAG bearing damage and countermeasures?

FAG bearing maintenance, overhaul, and abnormal handling
In order to maintain the original performance of the bearing in a good condition for as long as possible, it is necessary to maintain, repair, and prevent accidents, ensure the reliability of operation, and improve productivity and economy. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The contents include monitoring of operating conditions, replenishment or replacement of lubricants, and inspections for periodic disassembly.

FAG bearing damage and countermeasures

In general, if the bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and cannot be used. This early damage, as opposed to fatigue life, limits the quality of what is called a fault or accident. Many of them are caused by inadvertent installation, use, and lubrication, and foreign objects intruding from the outside are insufficiently studied for the thermal effects of the shaft and the outer casing.

Regarding the damage state of the FAG bearing, for example, the jam of the ferrule of the roller bearing, as a cause, the lubricant is insufficient, unsuitable, the defect of the oil supply structure, the foreign matter intrusion, the bearing installation error, the shaft deflection If the song is too big, there will be coincidences of these reasons.

Therefore, it is difficult to know the true cause of the damage by only investigating the bearing damage. However, if you know the mechanical use of the bearing, the conditions of use, the structure around the bearing, and the situation before and after the accident, combined with the damage state of the bearing and several reasons, it can prevent similar accidents from happening again.

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Detailed explanation: spherical bearing with seat

Insert bearing with housing bearing type bearing angular contact bearing: ball and ferrule nominal contact angle greater than 0 °, and less than 90 ° rolling bearing. It can withstand both radial and axial loads. Can work at higher speeds. The larger the contact angle, the higher the axial load carrying capacity. High precision and high speed bearings typically take a 15 degree contact angle. Under the axial force, the contact angle will increase.

2, with the spherical bearing type:

1), with a set screw outer spherical surface UC type bearing;
2), with a tapered hole outer spherical surface UK bearing;

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Self-aligning ball bearing failure cause and operation check work points and daily maintenance skills

After the TIMKEN bearing is installed, check the operation in order to check if the installation is correct. The small machine can be rotated by hand to confirm whether the rotation is smooth. The inspection items have poor operation due to foreign matter, scratches, and indentations. The installation is poor, the torque generated by the mounting is not stable, and the torque is too large due to too small clearance, installation error, and sealing friction. Wait. If there is no abnormality, the power running can be started.
Large machinery cannot be rotated manually, so the power is cut off immediately after the start of the no-load, the machine is idling, and the presence or absence of vibration, noise, and contact of the rotating parts is checked. After confirming that there is no abnormality, the power is turned on.
The power running starts from the no-load low speed and slowly increases to the rated operation of the specified conditions. The items to be checked during the test run are whether there is abnormal sound, change in the temperature of the self-aligning ball bearing, leakage or discoloration of the lubricant, and the like. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary.
TIMKEN bearing temperature can generally be estimated based on the external temperature of the bearing housing. However, it is more accurate to directly measure the temperature of the outer ring of the bearing by using the oil hole. The bearing temperature gradually rises from the start of the operation, and the temperature is usually stable after 1 to 2 hours. If the bearing is poorly installed, the temperature will rise sharply and an abnormally high temperature will occur. The reasons are such as excessive lubricant, too small bearing clearance, poor installation, excessive friction of the sealing device, and the like. In the case of high-speed rotation, the selection of TIMKEN bearing structure and lubrication method is also the cause.
The rotation sound of TIMKEN bearings is checked with a stethoscope, etc., and there are strong metal noise, abnormal sounds, irregular sounds, etc. to explain abnormalities. The reasons are poor lubrication, poor accuracy of the shaft or housing, bearing damage, and foreign matter intrusion.
The surface of the steel under transient high temperature acts on the oxygen in the air and rises into a very thin (20-30 nm) thin layer of iron oxide. It is worth noting that the thickness of the oxide layer is corresponding to the test results of the total thickness of the surface-grinding metamorphic layer. This shows that the thickness of the oxide layer is directly related to the grinding process and is an important indicator of the quality of the grinding.

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The importance of proper use of lubricants for the operation of SKF bearings

Of course, if the operating speed of the imported bearings is very low and it is necessary to work in a polluted and humid environment, it is best to fill the SKF housing with grease.
The standard products offered are more than 20,000 types of bearings. In addition to rolling bearings, the Group also manufactures linear bearings, plain bearings, bearing housings, ball and roller screws, textile machinery components, retaining rings, machine tools and various precision mechanical components. With extensive experience in these areas, he has the knowledge and expertise to develop, manufacture and apply a wide range of advanced engineering products. Smaller such as micro-bearings weighing only 0.003 grams, up to each of the thirty-four tons of giant bearings. In addition, a series of bearing repair tools, grease and bearing monitoring instruments (bearing heaters, pullers, etc.) are also available, in order to achieve higher efficiency for bearing users and achieve worry-free operation.
Bearings are precision components, SKF bearings and grease contaminated, will not operate. Bearings In addition, at least 14% of all contaminations that have been sealed with grease are maintenance-free. Only a small portion of all bearings failing early is significantly affected by the use of bearings. Bearings have excellent manufacturing and design capabilities to provide a wide range of harsh working condition sealing solutions.
The grease chemically reacts with the oxygen in the air to produce an acidic substance. It first consumes the antioxidant additive in the fat, but to a certain extent, the organic acid formed will corrode the metal component and destroy the structure of the fat to make it drop. Decrease, increase in viscosity of base oil, and deterioration of fluidity. A large number of tests have shown that the higher the temperature, the more pronounced the decline in grease life. For example, when the temperature is between 90 and 100 degrees, the life of the grease is reduced by about half for every 19 degrees of temperature increase. At 10 to 150 degrees, the fat life will be reduced by half for every 15 degrees of temperature increase.
In addition, moisture, dust, and harmful gases in the environment in which the grease is used are also important factors for deterioration. For example, the wear of particles such as copper, iron, lead and bronze in the grease will catalyze the oxidation of the fat. In short, there are many reasons for the failure of grease, sometimes it may be caused by a certain cause, but more is the result of multiple factors acting together, or a breakthrough for one reason, and then other reasons work together.

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Principles and functions of grease in NTN bearings

Our customers always have some improper use methods when using all kinds of NTN bearing grease. Today we will explain the principle and function of the grease in the bearing.
  1. Principle of use of grease
Everyone is a liquid solution that is a very thick solution. This grease is composed of a reticulated soap fiber whose structure determines that it can adsorb a large amount of lubricating oil and make it work properly. But as you can imagine, if a sponge is squeezed, the water will flow out. Grease is also squeezed out of the lubricating oil, but the grease in the NTN bearing is rarely directly squeezed and drained, because a freshly lubricated imported bearing is moving in the inner space of the bearing during running. Its main working principle is "temperature".
  2. Practical function of grease
The main reason for draining grease to the sliding surface is the increase in temperature of the grease around the NTN bearing. When the bearing starts to run normally, the grease will reach the sliding friction surface. Lubrication begins to work as the temperature increases.
Advantages of NTN imported bearings with grease lubrication:
    1) Individual bearing points must be refueled by hand. If the grease is used, it will save trouble and avoid accidents caused by lack of oil.
    2) The grease itself has a sealing effect, which allows the use of a mechanism with a low degree of sealing to achieve a simplified design.
    3) Experience has shown that lithium grease lubrication has a lower temperature rise and longer bearing life than a drop method in a certain speed range (n<20000r/min or dn<20000mm.r/min).
    2, NTN imported bearing lubrication theory basis: the lubrication mechanism of the bearing is the theory of elastic fluid dynamic pressure lubrication.
    3. NTN bearing failure type and lubrication relationship: Most of the failure causes are caused by faults in the assembly and poor sealing. A small number of failures are caused by wear, gluing, corrosion and overheating due to lack or excess of lubricant or quality failure.
    4. Basic characteristics of grease and general criteria for selecting grease:
    When selecting grease, it is necessary to select the grease that is compatible with the conditions of use (temperature, speed, load, environment, etc.), which are related to the basic characteristics of the grease, and the basic characteristics of the grease depend on the thickener and base oil. kind of.

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Reasons affecting the service life of INA bearings

There may be many factors that affect the service life of the bearing, which can be further clarified from the application factors and meanings.
If the first element is used, it means whether the device adjustment, application maintenance, maintenance and repair, etc. can meet the technical request. According to the technical requirements of INA bearing device, operation, maintenance and maintenance, the monitoring and inspection of the load, speed, working temperature, vibration, noise and lubrication accepted by the bearing in operation are suspended, and the abnormality is immediately found and the adjustment is suspended. Make it back to normal. The premise of the device is one of the primary factors in the application of the element. The bearing often causes the force condition between the parts of the whole bearing to change due to the unsuitable device. The bearing runs under abnormal conditions and the service life is early.
The first element of the connotation refers to the three sketches of the quality of the bearing, such as structural design, manufacturing process and data quality.
The metallurgical quality of imported bearing data was once the primary factor affecting the early failure of rolling bearings. With the improvement of metallurgical technology (such as vacuum degassing of bearing steel), the quality of the original data has been improved. The proportion of the original data quality factor in the bearing failure analysis has been significantly reduced, but it is still one of the primary factors affecting bearing failure. The suitability of the material selection is still an essential element for the analysis of bearing failure.
Rolling bearings exhibit late failure characteristics
Rolling bearings show late fault characteristics to serious faults (generally INA bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) are not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual rolling bearing fault diagnosis, once the late fault characteristics are found, the bearing should be judged decisively and the maintenance should be arranged as soon as possible.
Rolling bearing vibration and noise begin to increase
After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the INA bearing state is very stable and enters a stable working period. After continuing to run, the vibration and noise of the rolling bearing begin to increase, sometimes abnormal sounds appear, but the change of vibration increases slowly. At this time, the kurtosis value of the imported bearing suddenly reaches a certain value. We believe that the rolling bearing is an initial failure at this time.
Bearing manufacturing is customary through multiple processes such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. Thermal processing and grinding processes that affect the quality of scrap bearings are often more directly related to bearing failure. In recent years, the research on the turbulent layer of the bearing working surface indicates that the grinding process is closely related to the bearing surface quality.
The primary obligation of INA bearing life analysis is to find out the primary factors that constitute bearing failure based on a large number of landscape data, profiling data and failure mode, so as to propose improvement measures in a targeted manner, delay bearing decommissioning period and avoid bearing An early failure of a sudden fire.

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