Analysis of the causes of NSK bearing vibration and noise

Usually when we use imported bearings, the temperature rises after starting to run for a while, but the normal temperature is about 10~40 degrees. It is normal in the range of this value. Some bearings are operated in size and size. Different speeds and lubrication methods result in some bearings heating up slowly.

When the abnormal temperature rises when the NSK bearing does not reach the normal state, the following influencing factors can be considered, and then the rapid shutdown processing will inevitably cause unnecessary loss.

First, the main reason for the abnormal temperature rise of the bearing

Second, the bearing lubricant is too much or too little.

Third, the bearing is not properly installed.

Fourth, the internal clearance of the bearing is too small, or the load is too large.

Fifth, the friction of the bearing seal is too large.

Only if you know the cause of the temperature rise of the bearing clearly can you find a better solution.

Rolling bearings show late fault characteristics to serious faults (generally 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 NSK bearing should be judged decisively and the repair 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 bearing status is very stable and enters a stable working period. After continuing to run, the vibration and noise of the rolling bearing begin to increase, and sometimes abnormal sounds appear, but the change of vibration increases slowly. At this time, the bearing kurtness value suddenly reaches a certain value. We believe that the rolling bearing is an initial failure at this time.

NSK bearings are manufactured 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 bearing life analysis is to find out the primary factors that constitute bearing failure based on a large number of configuration data, analysis data and failure mode, so as to propose improvement measures in a targeted manner, delay the decommissioning period of NSK bearings, and avoid bearings. An early failure of a sudden fire.

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Causes and avoidance measures for INA bearing noise

When using the thick in the inlet, if it makes a very harsh sound, it means the sound that is emitted when the metal slides between the metal and the metal. This is the time when there is no influence on the INA bearing, it will not affect the normal operation of the bearing. In this case, how many shapes will be unnecessary wear and reduce the service life of the bearing, then how to solve the cause of the accident to solve the problem will make the bearing no longer emit What is the harsh sound? In the first step, the radial game of the bearing is prone to such a sound when it is very large, and it is easy to appear when it is running fast, and it is easy to appear in winter.

First, the bearings accidentally entered the sand or carbon particles, acids or paint and other debris;

Second, the moisture entering the bearing clearance causes corrosion and corrosion inside the bearing;

Third, the clearance of the imported bearings is too small or too large, resulting in improper selection of bearing size;

Fourth, the choice of lubricating oil or grease is incorrect; oil or grease leaks through the seal;

5. The lubricating oil level is too low, or the seat hole is not twisted straight;

Sixth, the bearing is not matched by the roundness of the flat hole of the seat hole clamp;

7. The unevenness of the horn on the bottom surface of the imported bearing housing causes the seat hole to be deformed, and even the imported bearing housing has cracked dust particles;

8. There are residues, chips and debris in the bearing housing hole;

9. When the sealing ring is eccentric, touching the adjacent components causes friction;

There are several ways to lubricate INA bearings, and each type of bearing and all types of bearings are also different when using lubrication, which is more conducive to maximizing the service life of the bearing and maximizing the performance of the mechanical equipment. status.

1, solid lubrication

Under some special conditions, a small amount of solid lubricant is added to the grease. For example, adding 3~5% of molybdenum disulfide No. 1 can reduce wear and improve the resistance to pressure and heat. For high temperature, elegance, high vacuum and corrosion resistance. Special conditions such as anti-radiation and extremely low temperature, the solid lubricant can be added into engineering plastics or powder metallurgy materials to make bearing parts with self-lubricating properties, such as bonding the solid lubricant to the raceway with an adhesive. A lubricating film is formed on the cage and the rolling elements, which has a certain effect on reducing friction and wear.

2, oil lubrication:

Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of lubricating oil and the thickness of oil film formed between friction surfaces. The viscosity of lubricating oil at INA bearing working temperature is generally 12-15cst. The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity. Commonly used lubricating oils include mechanical oil, high-speed mechanical oil, turbine oil, compressor oil, transformer oil, cylinder oil, and the like.

Oil lubrication methods include:

a. Oil bath lubrication

Oil bath lubrication is the most common lubrication method. It is suitable for the lubrication of low and medium speed bearings. Part of the bearing is immersed in the groove. The lubricating oil is brought up by the rotating bearing parts and then flows back to the oil groove. The oil level should be slightly lower than the minimum. The center of the rolling element.

b. drip lubrication

Drip lubrication is suitable for bearing parts that need to supply lubricating oil quantitatively. The amount of dripping is generally one drop per 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.

c. Circulating oil lubrication

The filtered oil is delivered to the bearing components by an oil pump, and then filtered and cooled by the lubricating oil after the INA bearing. Since the circulating oil can take a certain amount of heat to cool the bearing, this method is suitable for bearing parts with higher rotational speed.

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Lubrication quality effectively extends the service life of KOYO tapered roller bearings

Grease is a tapered roller bearing that is indispensable in the work. Any KOYO bearing can not be separated from the grease. Some people ask, is the more grease the better? The answer is of course no, below As far as the bearing is concerned, the grease should be used.

In the case of tapered roller bearings, excessive grease actually has many hazards. Because grease has good adhesion, wear resistance, temperature resistance, rust resistance and lubricity, it can improve high temperature oxidation resistance, delay aging, dissolve carbon deposits, and prevent metal chipping and oil staining. Improve the wear resistance, pressure resistance and corrosion resistance of the machine.

1, the installation of the bearing

Whether the tapered roller bearing is installed correctly affects accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of KOYO bearings. I hope to install according to the operating standards. The items of the job standard are usually as follows:

(1) Cleaning bearings and bearing related parts

(2) Check the size and finishing of the connected parts

(3) Installation

(4) Inspection after mounting the bearing

(5) Supply lubricant

2. Basic condition monitoring of bearings

During use, the basic external conditions of the operation of tapered roller bearings are often monitored, such as temperature, vibration and noise measurements. These regular inspections will identify potential problems early and will prevent unexpected machine stops, enabling production plans, increased plant productivity and efficiency.

3. Relubricate the bearing

During operation, tapered roller bearings require proper relubrication to perfect its performance. KOYO bearing lubrication method is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, choose a lubrication method that suits the conditions of use and the purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing.

Note:

4, the unloading of the bearing

When the tapered roller bearing will reach its end of life, it should be replaced.

Although the tapered roller bearing can no longer be used, correctly removing the original KOYO bearing and replacing the new bearing in time can promote the service life of the new bearing.

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How to maintain and clean IKO bearings

1. In the process of using IKO bearings, regular cleaning is very important. How to accurately clean IKO bearings? When the bearing is first removed for inspection, first use the method of photography to make a good appearance record. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.

2. The cleaning of the bearing is divided into rough washing and fine washing, and the metal mesh frame can be placed on the bottom of the used container.

3. When rough washing, clean the grease or adhesive with a brush on the top of the oil. At this time, if the transfer bearing is moved in the oil, the rolling surface is damaged by foreign matter such as foreign matter.

4. When fine washing, slowly shifting the bearing in the oil, it must be forced to stop.

5. The cleaning agent used on weekdays is neutral non-aqueous diesel or petroleum, and sometimes uses warm alkaline liquid according to demand. Regardless of which cleaning agent is used, it is often necessary to filter and clean the cockroach.

6. Immediately after cleaning, apply anti-rust oil or anti-rust grease to IKO bearings.

If the bearing has the following defects, it can no longer be used and the new bearing should be replaced immediately. details as follows:

(1) Cracks or notches on any of the inner ring, outer ring, rolling element and cage of the bearing;

(2) There is a break in any of the ferrules and rolling elements of the bearing;

(3) There are significant jams on the raceway surface, the ribs and the rolling elements of the bearing;

(4) The bearing cage is worn significantly or the rivet is significantly slack;

(5) There is rust and injury on the raceway surface of the bearing and the rolling element;

(6) There are serious indentations and marks on the raceway surface of the bearing and the rolling elements;

(7) The inner diameter of the inner ring of the bearing or the outer diameter of the outer ring has obvious creep;

(8) The discoloration caused by heat is obvious.

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