Commonly used INA self-aligning ball bearing lubrication inspection method

Clean the surface of the machine before inspection, and then remove the parts around the INA unloading bearing. The oil seal is a very fragile part, so be careful to disassemble it. Do not apply excessive force. Then carefully check the oil seal and its surrounding parts. If it has been shown to be bad, be sure to replace it. A bad oil seal will cause alignment. Ball bearing damage and severe equipment downtime.
Apply a little bit of lubricant to the friction between the two fingers. If there is any contaminant, feel it, or apply a layer of lubricant on the back of the hand, then seal the light.
Oil-lubricated INA bearings are vented with old oil and, if possible, refilled with fresh oil and allowed the machine to spin at low speed for a few minutes. As far as possible, the oil collects residual contaminants and then vents the oil. The oil is preferably filtered before use.
Grease-lubricated bearings should be replaced with a cotton joint to any part of the bearing when replacing the grease, as these residual fibers may wedge between the rolling elements and cause damage, especially It is the application of the small-key ball bearing that needs to pay attention to this problem.
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.
    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 working temperature is generally 12-15 cst. The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity.
Oil lubrication methods include:
a. Oil bath lubrication
Oil bath lubrication is the most common lubrication method. It is suitable for low and medium speed lubrication. A part of the self-aligning ball bearing is immersed in the groove. The lubricating oil is brought up by the rotating parts and then flows back to the oil groove. The oil level should be slightly lower. The center of the lowest rolling body.
b. drip lubrication
Drip oil lubrication is suitable for INA bearing parts that need to supply lubricating oil quantitatively. The amount of oil dripping is generally one drop every 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.
c. Circulating oil lubrication
The filtered oil is sent to the parts by an oil pump, and the used lubricating oil is filtered and cooled for use. Since the circulating oil can take a certain amount of heat to cool down, this method is suitable for bearing parts with a higher rotational speed.
d. Spray lubrication
The dry compressed air is mixed with the lubricating oil through a sprayer to form an oil mist. During the spraying, the air flow can effectively lower the temperature and prevent the intrusion of impurities. This method is suitable for the lubrication of high speed and high temperature parts.
e. Injection lubrication
The high-pressure oil is injected through the nozzle by the oil pump, and the injected oil flows into the oil groove through the other end. When the bearing rotates at a high speed, the rolling elements and the cage also cause the surrounding air to form a gas flow at a relatively high rotational speed.
When inspecting self-aligning ball bearings, never expose the bearings to contaminants or moisture. If the work is interrupted, the machine should be covered with a piece of oil-paper plastic or similar material.
If the unshielded INA bearing is cleaned without the need for disassembly, the coated INA bearing should be cleaned with a white spirit and then blown with a lint-free cloth or blown with compressed air. Dry (be careful not to let the bearing assembly start to rotate).
Do not clean the bearing with a sealing cover or dustproof; just wipe the outer surface. If the INA bearing is damaged, it needs to be replaced. It is much more economical to replace the self-aligning ball bearing during the regular downtime maintenance period to damage the selected sudden downtime.

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INA roller bearings are maintenance inspection standards

In order to fully utilize INA bearings and maintain their proper performance for a long time, regular maintenance (regular inspection) must be performed. Through proper periodic inspections, early detection of failures and prevention of accidents are important to improve productivity and economy.
Key factors affecting the life of a roller bearing For many rotating machinery products, their service life depends on the life of the bearing components at critical parts of the product. "Maintenance-free" bearings are not one-way bearings that will never be damaged or failed but will not be damaged within a certain period of time. Here the designers calculate the service life of the bearing. The bearing life of the INA bearing is greater than or equal to the overhaul period of the mechanical product. The bearing can be “maintenance free”. When the mechanical product is overhauled, the new bearing can be replaced without using the used bearing. Carry out maintenance.
1, cleaning
When the INA bearing is removed for inspection, the appearance record is first recorded by photography. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.
a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.
b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like.
c. When washing finely, slowly rotate the bearing in the oil and carry out it carefully.
The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean.
Immediately after cleaning, apply anti-rust oil or anti-rust grease to the roller bearings.
2, inspection and judgment
In order to judge whether the removed bearing can be reused, it is important to check its dimensional accuracy, rotation accuracy, internal clearance, mating surface, raceway surface, cage and seal.
Regarding the inspection result, it can be judged by a person who is using a conventional bearing or a proficient bearing.
The criteria for judgment vary depending on mechanical properties and importance, inspection period, and the like. Roller bearings must not be reused if they are damaged and must be replaced.
1) Breakage and defects of bearing components.
2) Peeling of the rolling surface of the raceway.
When the mechanism is running, the part where the one-way 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 temperature of the INA bearing 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 roller bearing is over-tightened; the bearing race rotates on the shaft or inside the casing; Too large; bearing cage or rolling element fragmentation.
The vibration system consisting of steel, flexibility, mass, damping, etc., determined by the design parameters of the one-way bearing structure, will produce vibrations that are compatible with its mechanics under operating conditions.
The vibration caused by the deviation in the manufacturing process is smaller, and the vibration is smaller. The roundness, waviness and surface roughness of the steel ball surface are the most influential factors on the vibration of each INA bearing component, followed by the shape error and surface roughness of the inner and outer ring channels, and again the roller bearing cleanliness and Lubricant quality, etc.
Operating conditions such as installation conditions, rotational speed, axial load direction, magnitude, etc.

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