The importance of proper use of lubricants for the operation of SKF bearings

    Of course, if the operating speed of the imported bearings is very low and it is necessary to work in a polluted and humid environment, it is best to fill the SKF housing with grease.
    The standard products offered are more than 20,000 types of bearings. In addition to rolling bearings, the Group also manufactures linear bearings, plain bearings, bearing housings, ball and roller screws, textile machinery components, retaining rings, machine tools and various precision mechanical components. With extensive experience in these areas, he has the knowledge and expertise to develop, manufacture and apply a wide range of advanced engineering products. Smaller such as micro-bearings weighing only 0.003 grams, up to each of the thirty-four tons of giant bearings. In addition, a series of bearing repair tools, grease and bearing monitoring instruments (bearing heaters, pullers, etc.) are also available, in order to achieve higher efficiency for bearing users and achieve worry-free operation.
   Bearings are precision components, SKF bearings and grease contaminated, will not operate. Bearings In addition, at least 14% of all contaminations that have been sealed with grease are maintenance-free. Only a small portion of all bearings failing early is significantly affected by the use of bearings. Bearings have excellent manufacturing and design capabilities to provide a wide range of harsh working condition sealing solutions.
   The grease chemically reacts with the oxygen in the air to produce an acidic substance. It first consumes the antioxidant additive in the fat, but to a certain extent, the organic acid formed will corrode the metal component and destroy the structure of the fat to make it drop. Decrease, increase in viscosity of base oil, and deterioration of fluidity. A large number of tests have shown that the higher the temperature, the more pronounced the decline in grease life. For example, when the temperature is between 90 and 100 degrees, the life of the grease is reduced by about half for every 19 degrees of temperature increase. At 10 to 150 degrees, the fat life will be reduced by half for every 15 degrees of temperature increase.
   In addition, moisture, dust, and harmful gases in the environment in which the grease is used are also important factors for deterioration. For example, the wear of particles such as copper, iron, lead and bronze in the grease will catalyze the oxidation of the fat. In short, there are many reasons for the failure of grease, sometimes it may be caused by a certain cause, but more is the result of multiple factors acting together, or a breakthrough for one reason, and then other reasons work together.
   When the grease is in use, it will be subjected to mechanical shearing and centrifugal force, and the grease will be pulled out of the friction interface to separate the oil, resulting in a decrease in grease oil content, a reduction in the degree of penetration and hardening. To a certain extent, the grease will be greased. It will completely fail; under the action of mechanical shearing, the grease structure will be loved to break (such as the dissociation or orientation of soap fiber), causing its softening, decreasing consistency and increasing oil deposition, which will eventually lead to failure. Normally, the grease transfer speed is increased by 2000r/min, and its life will be reduced by about half. Under high shear stress, the speed is doubled and the service life is only 1/10 of the original life.
   Free base refers to an excess of alkali that does not interact with fatty acids in the manufacture of soap-based grease; free organic acid refers to a fatty acid that is not saponified during the manufacturing process, or the hydrocarbon-based lipid itself contains an acid (naphthenic acid), or It is a product of oxidation or saponification decomposition of mineral oil in fat.
Although you can install all types of SKF bearing seals that are "free", 36% of the early failure of the bearings is still incorrect grease technology and improper use. Any bearing that is not properly lubricated will inevitably fail in normal life. Mechanical and equipment bearings are usually the most difficult part of the job, and no fixed lubrication will be a problem. In the case of manual maintenance, it is impossible to achieve an automatic lubrication system that can be developed to achieve the best lubrication. The grease, tools and effective lubrication techniques needed will help to significantly reduce downtime.

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Introduction to the method of solving the heating fault of SKF bearing by 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 maximizing the service life of SKF bearings, which is the highest performance of mechanical equipment. Performance status
     1. 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 SKF 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, 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.
The bearing is a fixed part of the machine and is the main body of the machine. Its function is basically to maintain the center position of the shaft and the mechanism for controlling the movement. SKF bearings play an important role in any machine. If there is no bearing, the machine will not work.
Many users have reported that when using imported bearings, the fault of the bearing heat is the most common, which will affect the life and performance of SKF bearings. So how is this failure formed? Below, is the knowledge that is summarized for everyone.
1. The oil level is too low and the lubricant is lost from the oil seal;
2. The grease in the bearing housing is completely filled or the oil level is too high. This can lead to excessive lubrication, high temperature or oil leakage;
3. The contact type (friction) oil seal is too dry or the spring is too tight;
4. The inner hole of the bearing box is not round; the bearing box is twisted and deformed; the bearing surface is not flat; the inner diameter of the box hole is too small;
5. The contact type (friction) oil seal is too dry or the spring is too tight.

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