Requirements for cleaning up contaminated and rusted SKF bearings

Washing oil, gasoline, ethanol, dehydrated liquid, neutral or alkaline cleaning agents can be used to clean SKF bearings. However, it should be noted that "gasoline, washing oil, ethanol and dehydrated liquids are flammable; alkaline cleaners are corrosive.

The danger of burning, exploding and decomposing with hydrogen chloride-based solvent oil may also be harmful to health. When cleaning SKF bearings, use tools such as sharp brush, flat brush or fiber-free fabric. Once the solvent is evaporated, the SKF bearing is immediately coated with anti-rust oil. When SKF bearings have hardened oil or grease residues, the SKF bearings can be cleaned mechanically first and then treated with an aqueous solution of a strong alkaline material.

1. In the process of producing bearings, some enterprises did not strictly carry out anti-rust treatment on the bearing parts in the process and the assembled SKF bearing products in accordance with the requirements of cleaning anti-rust regulations and oil seal anti-rust packaging. If the ferrule has a long turnaround time during the turnaround, the outer ring of the outer ring is exposed to corrosive liquid or gas.

2. The quality of anti-rust lubricating oil and cleaning kerosene used by some enterprises in production cannot meet the requirements of process technology.

3. As the price of SKF bearing steel drops and then drops, the bearing steel material gradually declines. For example, the content of non-metallic impurities in the steel is too high (the increase in sulfur content in the steel causes the corrosion resistance of the material itself to decrease), the metallographic structure deviation, and the like. The source of bearing steel used in production companies is more complicated, and the quality of steel is even more.

4. Some enterprises have poor environmental conditions, high levels of harmful substances in the air, and too little turnover space, making it difficult to carry out effective anti-rust treatment. Coupled with the hot weather, production workers violated anti-rust procedures and other phenomena.

5, some enterprises' anti-rust paper, nylon paper (bag) and plastic cylinders and other SKF bearing packaging materials do not meet the requirements of rolling bearing oil seal anti-rust packaging is also one of the factors causing corrosion.

6. The turning allowance and grinding allowance of some SKF bearing rings are small, and the oxide scale and decarburization layer on the outer circle are not completely removed.

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FAG bearing inspection and cleaning method

In order to determine whether the removed FAG bearing can be reused, check the bearing after it has been cleaned. Carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase in the FAG bearing clearance, and the presence or absence of damage to the dimensional accuracy. For non-separable miniature ball bearings, use one hand to support the inner ring horizontally and rotate the outer ring to check if it is smooth.

Separate bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.

Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, and ribs. The higher the importance of bearings, the more careful inspection is required.

The judgment of whether or not to reuse is determined by considering the degree of FAG bearing damage, mechanical properties, importance, operating conditions, and the period until the next inspection. However, if you have the following defects, you can no longer use them. New bearings must be replaced.

There is a crack, or a gap, in any of the inner ring, the outer ring, the rolling element, and the cage.

There is a break in any of the ferrule and the rolling element.

There is significant slack in the raceway, ribs and rolling elements.

There are rust and damage on the raceway surface and the rolling elements.

There are severe indentations and marks on the raceway surface and rolling elements.

There is significant creep in the inner diameter surface of the inner ring or the outer diameter surface of the outer ring.

The discoloration caused by heat is obvious.

Bearings sealed with grease, seals, or dust caps are clearly damaged.

FAG bearing cleaning

When disassembling the FAG bearing for inspection, first record the appearance of the bearing, confirm the residual amount of lubricant, and after sampling the lubricant for inspection, wash the bearing. As a cleaning agent, gasoline and kerosene are commonly used. The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the bearing does not directly contact the container. In the case of fine cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.

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FAG bearing inspection and cleaning method

In order to determine whether the removed FAG bearing can be reused, check the bearing after it has been cleaned. Carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase in the FAG bearing clearance, and the presence or absence of damage to the dimensional accuracy. For non-separable miniature ball bearings, use one hand to support the inner ring horizontally and rotate the outer ring to check if it is smooth.

Separate bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.

Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, and ribs. The higher the importance of bearings, the more careful inspection is required.

The judgment of whether or not to reuse is determined by considering the degree of FAG bearing damage, mechanical properties, importance, operating conditions, and the period until the next inspection. However, if you have the following defects, you can no longer use them. New bearings must be replaced.

There is a crack, or a gap, in any of the inner ring, the outer ring, the rolling element, and the cage.

There is a break in any of the ferrule and the rolling element.

There is significant slack in the raceway, ribs and rolling elements.

There are rust and damage on the raceway surface and the rolling elements.

There are severe indentations and marks on the raceway surface and rolling elements.

There is significant creep in the inner diameter surface of the inner ring or the outer diameter surface of the outer ring.

The discoloration caused by heat is obvious.

Bearings sealed with grease, seals, or dust caps are clearly damaged.

FAG bearing cleaning

When disassembling the FAG bearing for inspection, first record the appearance of the bearing, confirm the residual amount of lubricant, and after sampling the lubricant for inspection, wash the bearing. As a cleaning agent, gasoline and kerosene are commonly used. The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the bearing does not directly contact the container. In the case of fine cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.

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NSK bearing grease for extremely low temperature applications

MolykTM 33 Extremely Low Temperature NSK Bearing Greases operate from -73° to 180°C for plastic gears, NSK bearings, cams, metal and rubber components that must operate at low operating temperatures, harsh climatic conditions or oxidizing environments Lubrication is effective.

MolykTM 33 Extremely Low Temperature NSK Bearing Greases are available in both low and medium consistency (NLGI #1 and #2) and can be used in refrigerated truck casters, freezer transfer equipment, device disconnector joints, plastic electronic alarm clock motors, large Metering meter, power factor meter, power meter, wiper motor gear, imaging equipment, optical equipment, X-ray equipment, oscilloscope, exploration equipment, light low torque equipment, starter clutch motor.

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Rolling FAG bearing basic production process

Due to the type, structure type, tolerance class, technical requirements, materials and batches of rolling FAG bearings, the basic production process is not identical.

First, the processing of the main parts of various FAG bearings:

1. The processing of the ferrule: the processing of the inner and outer rings of the FAG bearing varies according to the raw material or the blank form. The process before the machining can be divided into the following three types: the whole processing process is: bar or tube Materials (some bar materials need to be forged and annealed, normalized)----Car processing----heat treatment----grinding----finishing or polishing----final inspection of parts--- -Anti-rust----Warehouse----(to be equipped with a package)

2. The processing of steel balls and the processing of steel balls are also different depending on the state of the raw materials. The processes before the frustration or the photosphere can be divided into the following three types. The processes before the heat treatment can be further divided into the following steps. Two kinds, the whole processing process is: bar material or wire cold punching (some bars need to be punched and annealed after cold pressing)----frustration, rough grinding, soft grinding or light ball----heat treatment- --- Hard grinding----fine grinding----finishing or grinding----final inspection group----rust prevention, packaging----into the warehouse <to be combined with the package>.

3. The processing of the roller during the processing of the roller varies according to the raw materials. The process before the heat treatment can be divided into the following two types. The whole processing process is: bar processing or wire cold rolling, string ring and soft grinding ----Heat treatment----string soft point----grinding outer diameter----grinding end face----finishing end face----fine grinding outer diameter----finishing outer diameter ---- Final inspection group----rust prevention, packaging----into the warehouse (to be combined with the package).

4. The processing process of the cage of the cage can be divided into the following two categories according to the design structure and raw materials:

(1) Sheet → shear → punching → stamping forming → shaping and finishing → pickling or shot peening or stringing → final inspection → rust prevention, packaging → storage (to be combined)

(2) The processing process of the solid cage: the processing of the solid cage varies according to the raw materials or the gross damage. The following four types of blanks can be divided into the following processing: the bar is Pipe, forgings, castings----car inner diameter, outer diameter, end face, chamfering----drilling (or pulling holes, boring)----pickling----final inspection---- Anti-rust, packaging----into the warehouse.

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Rolling repair of KOYO bearings

Rolling KOYO bearings are mass-produced mechanical parts, and the manufacturing precision is very strict, and the degree of technical specialization is very high. Therefore, for most KOYO bearing varieties that are easy to buy, it should be more cost-effective to buy than repair. In the following cases, the problem of repairing KOYO bearings is considered.

(1) A large number of KOYO bearings of the same type used in large factories, the failure modes are mainly the wear of the rolling surface, fatigue or fretting abrasion, especially the damaged parts are mostly cages or rolling elements, while the ferrules or gaskets still have Repair value

(2) Large and extra large KOYO bearings, which have no major damage to the parts due to failure or failure, or expensive KOYO bearings must try to extend their effective use period;

(3) Some KOYO bearing varieties that are difficult to purchase, have no spare parts after failure and have to be repaired, especially imported KOYO bearings;

(4) KOYO bearings have minor damage, such as slight rust generated during the inventory period, and slight fretting abrasion caused by transportation. It is a pity that such repairs are easy to remove.

In addition to economics, the repair of KOYO bearings is technical, which requires the repairer to fully understand the corresponding technical requirements of KOYO bearings, and the structural, technical and material characteristics of KOYO bearings and their parts, otherwise it is difficult to guarantee KOYO bearing repairs have the desired effect.

First, the economic benefits of KOYO bearing repair

In general, KOYO bearings are small in variety, large in quantity, high in price of individual KOYO bearings, or simple in structure of KOYO bearings. If the size is large, the cost of repair is relatively low, and the economic benefit is higher.

In addition, we monitor the operation of KOYO bearings and plan to repair them before the failure of KOYO bearings, and we can get twice the result with half the effort. Following a reasonable process, using efficient repair equipment and tools, and getting help from a professional KOYO bearing plant can help increase economic efficiency.

Second, the benefits of cooperation with professional KOYO bearing companies

In the business of repairing KOYO bearings, if you can get the cooperation of professional KOYO bearing companies, you will get the following benefits:

(1) The technical requirements of each process of repair can be clarified, and how to ensure the overall quality of the repaired KOYO bearings,

 (2) It is possible to utilize the many specialized experience of the professional KOYO bearing factory, which can meet the process requirements reliably, efficiently and economically;

(3) It is possible to order the tool card mold from the professional KOYO bearing enterprise, which can be used for repair business, which may be economical and save a lot of trouble;

(4) Orders such as cages, rolling elements, rivets, etc. can be ordered from professional KOYO bearing companies, which may make the repair work simple, convenient and economical.

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IKO bearing lubrication

The purpose of IKO bearing lubrication:

The purpose of lubrication of rolling IKO bearings is to reduce the internal friction and wear of IKO bearings, to prevent sticking, and the lubricating effect is as follows.

(1) Reduce friction and wear.

In the mutual contact portion of the ferrule, the rolling element and the retainer constituting the IKO bearing, metal contact is prevented, and friction and wear are reduced.

(2), prolong the fatigue life.

The rolling fatigue life of IKO bearings is prolonged when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the thickness of the lubricating oil film is not good, it is shortened.

(3), discharge friction heat, cooling.

The circulation oil supply method or the like can be used to discharge heat generated by friction or heat from the outside to cool. Prevent IKO bearings from overheating and prevent the lubricant from aging itself.

(4), other

There is also the effect of preventing foreign matter from entering the inside of the IKO bearing or preventing rust and corrosion.

Lubrication method:

The lubrication method of IKO bearings is divided into grease lubrication and oil lubrication. In order to make the IKO 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 IKO bearing, comparing the advantages and disadvantages of grease lubrication and oil lubrication.

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