The best method and conditions for repairing KOYO bearings



KOYO bearings are mass-produced mechanical parts, and the manufacturing precision requirements are very strict. Therefore, for most of the easy-to-buy bearing types, it should be more cost-effective to buy than to repair. Only in the following cases, bearing repair is considered. The problem is:

(1) A large number of bearings of the same type used in large factories are mainly in the form of wear on the rolling surface, fatigue or fretting abrasion, especially the damaged parts are mostly cages or rolling elements, and the ferrules or gaskets are still repaired. value;

(2) Large and extra large bearings, which have no major damage to the parts due to failure or failure, or valuable bearings must be managed to extend their useful life;

(3) Some types of bearings that are really difficult to purchase, have no spare parts after failure and have to be repaired, especially imported bearings;

(4) The bearing has slight damage, such as slight rust generated during the inventory period, and slight fretting abrasion caused by transportation. It is a pity that such repair is easy and abandon.

In addition to economics, the repair of the bearing is also technical, which requires the repairer to fully understand the corresponding technical requirements of the bearing, and the structural, technical and material characteristics of the bearing and its parts, otherwise it is difficult to ensure that the bearing repair has The desired effect.

First, the economic benefits of bearing repair

In general, the number of bearings is small, the number is large, the price of a single bearing is high, or the structure of the bearing is simple. If the size is large, the cost of repair is relatively low, and the economic benefit is higher.

In addition, monitoring the operation of the bearing, and planning to repair the bearing before failure, 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 bearing plant can help increase economic efficiency.

Second, the benefits of cooperation with professional bearing companies

In the business of repairing bearings, if the cooperation of professional bearing companies can be obtained, the following benefits may be obtained:

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

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

(3) It is possible to order a tool for a professional bearing company, which can be economical and saves a lot of trouble;

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



INA bearing will change its bearing capacity, rotation precision and wear resistance due to its own quality and external conditions during use. When the performance index of INA bearing is lower than the use requirements and cannot work normally, INA bearing will occur. If the fault occurs or even fails, the INA bearing will stop after the failure, and the machine and equipment will stop and there will be various abnormal phenomena such as loss of function. Therefore, it is necessary to find out the cause in a short period of time and take corresponding measures.

In order to ensure that INA bearings can maintain their proper performance under long-term conditions and must be used for a long time. INA bearings must be inspected and maintained. Inspection and maintenance are very important to prevent malfunctions. In operation, it is important to check the rolling sound of INA bearings. , vibration, temperature and lubricant.

2. Vibration of INA bearings

The vibration of INA bearing has obvious influence on the failure of INA bearing. For example: peeling, indentation, corrosion, crack, wear, etc. will be reflected in the vibration test of INA bearing, so the special INA bearing vibration measuring device (frequency analyzer) is adopted. And the vibrometer, etc.) can measure the magnitude of the vibration, and the specific situation of the abnormal vibration can be inferred by the frequency distribution. The measured value differs depending on the use conditions of the INA bearing or the mounting position of the sensor, and therefore needs to be in advance for each machine. The measured values ​​are analyzed and compared to determine the criterion.

3. INA bearing temperature

Usually, the temperature of the INA bearing rises slowly with the start of operation, and reaches a steady state after 1 to 2 hours. The normal temperature of the INA bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If lubrication or installation is not suitable, then The temperature of the INA bearing will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the machine and take necessary precautions.

4. Lubricant

Lubrication has an important influence on the fatigue life and friction, wear, temperature rise, vibration, etc. of the rolling INA bearing. Without normal lubrication, the INA bearing can not work. Analysis of the damage of the INA bearing indicates that about 40% of the INA bearing damage is associated with Lubrication is related. Therefore, the good lubrication of INA bearings is an effective measure to reduce the friction and wear of INA bearings. In addition, the lubrication of INA bearings also plays a role in heat dissipation, rust prevention, sealing, and mitigation. Can not expire, the selection should be correct. The lubrication of the INA bearing of the harvester is divided into oil lubrication and grease lubrication. For large gearbox oil lubrication, GL-5 80W90 gear oil is used. Grease lubrication is generally lubricated with lithium molybdenum disulfide. Grease, lubricator, stepless speed change lower unit must be lubricated with Mobil XHP222 or better grease.
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