The function of the FAG bearing is to make the stationary ring and the rotating ring of the needle bearing and the stationary part (usually the bearing seat) and the rotating part (usually the shaft) of the mounting part are respectively fixed together, thereby transmitting the load under the rotating state. And the basic task of defining the position of the motion system relative to the stationary system.
On the shaft and in the housing, the rolling bearing requires its position to be fixed in three directions: radial, axial and tangential directions. Radial and tangential positioning is achieved by tight fit of the bearing ring. Axial positioning is only used in a few cases; usually axial stops are used, such as end caps and retaining rings. Limited to the clearance range.
FAG bearings should pay attention to the following four points when choosing to cooperate
The circumferential surface of the bearing ring should have good support and uniform force to reduce deformation and give full play to the bearing capacity of the FAG bearing;
The bearing ring cannot slide in the tangential direction in its mating surface, otherwise the mating surface will be damaged;
The free end bearing must be compatible with the length change of the shaft and the housing bore, ie it must have the ability to accommodate the axial position to swim within a certain range;
It is necessary to make the needle roller bearing easy to install and disassemble, saving labor, time and money.
It is very beneficial to make good use of the needle roller bearing. I also hope that everyone will fully consider the above four points when choosing.
For grease-lubricated bearings and oil seals or dust caps on both sides, the FAG bearing seals do not need to be cleaned before installation. Check the size and finishing of the relevant parts.
1, grease lubrication
Relubrication of FAG bearings is best carried out during planned equipment downtime and is periodically replenished, while removing old grease or extruding old grease through the drain. Wipe the grease fittings clean before adding fresh grease. If the bearing housing does not have a grease fitting, the bearing housing cover or end cap should be opened to remove the old grease and, after cleaning, replenish the same type of fresh grease.
2, lubricating oil lubrication
Regularly check the oil level and oil quality of the lubricating oil. Under normal circumstances, the normal oil level should be within the range of 1/3-2/3 of the equipment oil level window or mark. The oil filling method is oil cup, the oil level shown only represents the oil replenishing capacity, and the bearing tank oil level is to meet the operation requirements. The oil level in the oil cup is less than 1/4 of its total volume.
Check and replenish the oil method, take a small amount of lubricating oil as a sample and compare it with fresh oil. The competent unit can consider the oil quality test to ensure the oil quality is qualified. If the sample looks cloudy, it may be the result of mixing with water, which is commonly referred to as oil emulsification. At this point, the lubricant should be replaced.
If the sample is darkened or thickened, it may indicate that the lubricant has begun to carbonize and the old lubricant should be completely replaced. If possible, flush the oil line with fresh oil. When changing the lubricating oil, make sure that the new and old models of the replaced oil are the same and supplement the required oil level.
Use an oil bath type lubrication system. If the oil temperature is below 60 ° C (140 ° F) and the lubricant is not contaminated, replace the lubricant once a year. If the oil temperature is between 60-100 ° C (140-210 ° F), the lubricant needs to be replaced four times a year. If the oil temperature is between 100 and 120 ° C (210-250 ° F), the lubricant needs to be replaced once a month. If the oil temperature is above 120 ° C (250 ° F), the lubricant needs to be replaced once a week.
Lubrication points during the operation of FAG linear bearings
Mix two incompatible oils and never mix incompatible oils. Usually the consistency will be soft, and finally the damage will be caused by the loss of grease. If you don't know the grease you used in FAG bearings, you should first remove all the original grease and then add a grease to lubricate.
In the process of using linear bearings, we often encounter such a situation. How are these situations formed? How to solve them when they are formed has always been the biggest headache for the technicians of major enterprises. The causes and solutions for the phenomenon of overheating of the bearing during use are explained in detail: The instantaneous high temperature in the grinding zone can be heated to a temperature higher than the tempering heating temperature of the workpiece at a certain depth (10 to 100 nm). In the case where the austenitizing temperature is not reached, as the temperature to be heated is increased, the surface layer will be re-tempered or high-temperature tempered in accordance with the heating temperature, and the hardness will also decrease. The higher the heating temperature, the more the hardness decreases.
In the grinding process, the grinding wheel and the workpiece contact area consume a large amount of energy, generating a large amount of grinding heat, resulting in local instantaneous high temperature in the grinding zone. Using the linear heat transfer heat transfer theoretical formula to derive, calculate or apply the infrared temperature and thermocouple method to measure the instantaneous temperature under experimental conditions, it can be found that the instantaneous temperature in the grinding zone can be as high as 1000-1500 °C in 0.1-0.001 ms. Such instantaneous high temperature is sufficient to cause high temperature oxidation, amorphous structure, high temperature tempering, secondary quenching, and even burn cracking of the surface layer at a certain depth on the working surface.
The surface of the steel under transient high temperature acts on the oxygen in the air and rises into a very thin (20-30 nm) thin layer of iron oxide. It is worth noting that the thickness of the oxide layer is corresponding to the test results of the total thickness of the surface-grinding metamorphic layer. This shows that the thickness of the oxide layer is directly related to the grinding process and is an important indicator of the quality of the grinding.
The grease used in FAG bearings has rust resistance. The performance of rust prevention is mainly based on the solubility of oil, different viscosity and grease formed by different materials, with different levels of anti-volume and anti-rust properties. Generally speaking, the viscosity is large and the fat solubility is poor. The grease is more water-repellent. Even if the grease is filled with water in the linear bearing cavity, it can form a layer of oil film that can resist the appearance of the steel. Because of the low rotation speed of the bicycle, the choice of grease can be relatively high, but the water resistance is very strong. Because the bicycle is often used in car wash, rain, and off-road, it is very important to deal with water, even if it is The slightly viscous grease will not affect the smoothness under low rotation, and once the surface is oxidized, the entire peeling process and aging process will be rapidly intensified.
In the process of using linear bearings, we often encounter such a situation. How are these situations formed? How to solve them when they are formed has always been the biggest headache for the technicians of major enterprises. The causes and solutions for the phenomenon of overheating of the bearing during use are explained in detail: The instantaneous high temperature in the grinding zone can be heated to a temperature higher than the tempering heating temperature of the workpiece at a certain depth (10 to 100 nm). In the case where the austenitizing temperature is not reached, as the temperature to be heated is increased, the surface layer will be re-tempered or high-temperature tempered in accordance with the heating temperature, and the hardness will also decrease. The higher the heating temperature, the more the hardness decreases.
In the grinding process, the grinding wheel and the workpiece contact area consume a large amount of energy, generating a large amount of grinding heat, resulting in local instantaneous high temperature in the grinding zone. Using the linear heat transfer heat transfer theoretical formula to derive, calculate or apply the infrared temperature and thermocouple method to measure the instantaneous temperature under experimental conditions, it can be found that the instantaneous temperature in the grinding zone can be as high as 1000-1500 °C in 0.1-0.001 ms. Such instantaneous high temperature is sufficient to cause high temperature oxidation, amorphous structure, high temperature tempering, secondary quenching, and even burn cracking of the surface layer at a certain depth on the working surface.
The surface of the steel under transient high temperature acts on the oxygen in the air and rises into a very thin (20-30 nm) thin layer of iron oxide. It is worth noting that the thickness of the oxide layer is corresponding to the test results of the total thickness of the surface-grinding metamorphic layer. This shows that the thickness of the oxide layer is directly related to the grinding process and is an important indicator of the quality of the grinding.
The grease used in FAG bearings has rust resistance. The performance of rust prevention is mainly based on the solubility of oil, different viscosity and grease formed by different materials, with different levels of anti-volume and anti-rust properties. Generally speaking, the viscosity is large and the fat solubility is poor. The grease is more water-repellent. Even if the grease is filled with water in the linear bearing cavity, it can form a layer of oil film that can resist the appearance of the steel. Because of the low rotation speed of the bicycle, the choice of grease can be relatively high, but the water resistance is very strong. Because the bicycle is often used in car wash, rain, and off-road, it is very important to deal with water, even if it is The slightly viscous grease will not affect the smoothness under low rotation, and once the surface is oxidized, the entire peeling process and aging process will be rapidly intensified.
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