Status, causes and measures of bearing erosion

Damage state: The so-called electric erosion refers to a phenomenon in which a current flows through a thin lubricating oil film when a circulating weight-bearing bearing race wheel and a contact portion of a rolling element flow, and localized melting and unevenness appear on the surface thereof.

Cause: The ground potential difference between the outer ring and the inner ring.

Action: When setting the circuit, the current will not flow through the bearing part. Insulate the bearing.

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Fault analysis of motor NSK bearing

There are many reasons for motor failure. Here NSK bearing dealers share with you the fault analysis related to the bearing when the motor is out of order.

When the motor is running, the sound is not normal and there is abnormal noise.

One of the causes

1 The rotor is rubbed with the stator insulating paper or the wedge;

2 bearing wear or foreign matter such as sand in the oil;

3 fixed rotor core loose;

4 bearings are short of oil;

5 air duct packing or fan air hood,

6 fixed rotor core rubbing;

7 The power supply voltage is too high or unbalanced;

8 stator windings are staggered or shorted.

Motor NSK bearing overheating

1. cause of issue

1 too much or too little grease;

2 oil quality is not good with impurities;

3 bearing improperly matched with the journal or end cap (too loose or too tight);

4 bearing inner hole eccentric, rubbing with the shaft;

5 motor end cover or bearing cover is not flat;

6 The motor and load coupling is not corrected, or the belt is too tight;

7 bearing clearance is too large or too small;

8 The motor shaft is bent.

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Analysis of the causes of nine common faults

    It is not uncommon for the bearing to malfunction during operation, so there is no need to make a fuss. A failure has occurred and it is critical to judge and deal with it. Today we will explain the reasons for the common failure of FAG bearings.

1. The bearing temperature is too high: When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When the body of the mechanism is touched by hand, it should be normal to not feel hot, otherwise the bearing temperature is too high.

The reasons for the bearing temperature being too high are: the quality of the lubricating oil does not meet the requirements or deteriorates, the viscosity of the lubricating oil is too high; the assembly of the mechanism is too tight (the gap is insufficient); the bearing assembly is too tight; the bearing race rotates on the shaft or inside the casing; Large; bearing cage or rolling body fragmentation.

2. Bearing noise: The rolling bearing is allowed to have a slight running noise during operation. If the sound is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty.

The reason for the noise generated by the rolling bearing: more complicated, 1) is the wear of the inner and outer rings of the bearing. As a result of this wear, the bearing and the housing, the bearing and the shaft are broken, causing the axis to deviate from the correct position and produce an abnormal sound when the shaft is moving at a high speed. When the bearing is fatigued, the surface metal peeling off will also increase the radial clearance of the bearing to produce abnormal noise. 2) Insufficient bearing lubrication, dry friction, and bearing crushing will produce abnormal sounds. 3) After the bearing wears loose, the cage is loose and damaged, and the abnormal bearing damage will also occur. When the rolling bearing is disassembled and inspected, the bearing failure and the cause of damage can be judged according to the damage of the bearing.

3. Metal peeling on the raceway surface: The rolling elements of the bearing and the raceway surfaces of the inner and outer rings are subjected to periodic pulsating loads, thereby generating cyclically varying contact stresses. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the rolling element or the inner and outer ring raceways. If the bearing load is too large, this fatigue will be exacerbated. In addition, the bearing is not installed correctly, the shaft is bent, and the raceway is peeled off. Fatigue spalling of the bearing races reduces the accuracy of the shaft and causes vibration and noise in the mechanism.

4, bearing burns: burned bearings have tempering color on the raceway and rolling elements. The causes of burns are generally insufficient lubrication, the quality of the lubricant does not meet the requirements or deterioration, and the bearing assembly is too tight.

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Commonly used imported bearing lubrication

    There are several ways to lubricate imported bearings, and each type of bearing and all types of bearings are also different when using lubrication, which is more conducive to maximize the service life of imported bearings, which is the highest performance of mechanical equipment. Performance 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 the lubricating oil and the thickness of the oil film formed between the friction surfaces. The viscosity of the lubricating oil at the working temperature of the bearing is generally 12-15 cst. 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, filtered through the lubricating oil after the bearings, and then cooled and used. 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.
d. Spray lubrication
The dry compressed air is mixed with the lubricating oil through a sprayer to form an oil mist. In the jet bearing, the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the lubrication of high speed, high temperature bearing components.
e. Injection lubrication
The high-pressure oil is injected into the bearing through the nozzle by the oil pump, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling elements and the cage also form a gas flow at the relatively high rotation speed of the surrounding air. It is difficult to send the lubricating oil to the bearing by the general lubrication method. At this time, the lubricating oil must be sprayed by the high-pressure injection method. In the bearing, the position of the nozzle should be placed between the inner ring and the center of the cage.

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Repair method of roller bearing

The lubricant inside the roller bearing can be roughly divided into oil and grease. Basically, most of the lubricants used in the production of SKATE are grease lubricants, and some of the products on the market are made of oil as a lubricant.
Repair method
· Preparation: Dry towel, sharp tongs, bearing cleaning night, bearing lubricant or grease.
a. Remove the C-ring and shroud: Wipe the dirt off the bearing with a dry towel, then use a pointed plier to lift the side of the C-ring and remove the C-ring and shroud.
b. Bearing cleaning fluid: soak the bearing in the bearing cleaning fluid bought on the market, and shake it at this time, the foreign matter inside the bearing will be shaken out, and some supermarkets buy ultrasonic cleaning machine is also very helpful in removing foreign matter. .
c. Drying: Remove the bearing from the cleaning solution, wipe the cleaning solution with a dry towel, and dry in a cool place.
d. Inject the lubricant according to the trend to inject grease or oil into the bearing, cover the shroud and reattach the C-ring.
e. Detection: Perform several rotations after grasping the inner ring with the fingers that have been assembled into the original state.

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Fault diagnosis and inspection of separation bearing damage

If the clutch is not able to meet the above requirements, it is considered a malfunction. After a fault occurs, first determine which phenomenon is the separation bearing damage. After the engine is started, the clutch pedal is lightly pressed. When the free travel is just eliminated, the “sand” sound that appears is the separation of the bearing rings.
When checking, the clutch bottom cover can be removed, and then a few accelerator pedals are pressed to slightly increase the engine speed. If the sound is louder, observe the presence or absence of Mars. If there is Mars, the clutch release bearing is damaged. If Mars is in a single strand, it means that the separation bearing balls are broken. If there is no Mars, but the metal breaks, it means excessive wear.

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Bearing oil and characteristics

Core Tip: Spindle bearing oil is a special lubricant for precision machine tools and similar equipment spindle bearings. It plays an important role in ensuring the working accuracy and performance of the spindle and prolonging its service life.
Spindle bearing oil is a special lubricant for spindle bearings of precision machine tools and similar equipment. It plays an important role in ensuring the working accuracy and performance of the spindle and prolonging its service life. It is also called bearing oil.
Its main performance:
1. Suitable viscosity and good viscosity temperature characteristics
In order to make the machine tool spindle temperature not too high, the machine tool will be thermally deformed, affecting the machining accuracy or making the bearing poorly lubricated. The lubricating oil of the appropriate temperature should be selected according to the spindle bearing structure, the rotating speed and the bearing clearance, and it is required to have good viscosity-temperature characteristics. To prevent the change in viscosity due to excessive changes in the operating temperature of the spindle and the ambient temperature, which affects the lubrication performance.
2. Good lubricity
In order to maintain a uniform oil film between the main shaft and the bearing contact surface, and the impact film is not damaged when the spindle starts or stops moving, maintaining good lubrication performance reduces friction and friction heat, reduces spindle temperature rise, and ensures The effect of processing accuracy requires good lubrication performance.
3. Good oxidation resistance
When the machine tool spindle adopts the circulating lubrication method, the spindle bearing oil is required to be used for a long time without deterioration, so it is required to have good oxidation resistance.
4. Good rust resistance
Since the oil is inevitably mixed into the condensed water in the air or the machine coolant during the operation of the spindle lubrication system, the oil is required to have good rust resistance.

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