First, the choice of grease lubrication has an extremely important impact on the operation and life of the INA bearing. Here is a brief introduction to the general principles for selecting grease. Grease is made of base oil, thickener and additives. The grease performance of different types and different grades varies greatly. The allowable rotation limit is different. Be careful when selecting. The performance of grease is mainly determined by the base oil. Generally, the low viscosity base oil is suitable for low temperature, high speed and high viscosity for high temperature and high load. The thickener is also related to the lubricating properties, and the water resistance of the thickener determines the water resistance of the grease. In principle, the different greases of the brand cannot be mixed, and even the grease of the same thickener may have a bad influence on each other due to the different additives. Second, the bearing must be cleaned before the bearing surface is coated with anti-rust oil, you must carefully clean with clean gasoline or kerosene, and then apply clean high-quality or high-speed high-temperature grease to install and use. The effect of cleanliness on rolling bearing life and vibration noise is very large. But we must remind you that the fully enclosed bearings do not need to be cleaned and refueled. 3. When installing and disassembling, do not directly hammer the INA bearing end face and the non-stressed surface. The bearing should be evenly stressed by the clamp, sleeve or other installation tools (tooling). Do not install by the rolling body transmission force. If the mounting surface is coated with oil, it will make the installation smoother. If the interference is large, the bearing should be placed in mineral oil and heated to 80~90 °C and installed as soon as possible. The oil temperature should not be strictly controlled to exceed 100 °C to prevent the tempering effect from decreasing and affecting dimensional recovery. When disassembling is difficult, it is recommended that you use the disassembly tool to pull outward while carefully pouring hot oil onto the inner ring. The heat will cause the inner ring of the rolling bearing to expand, making it easier to fall off. 4. Requirements for the installation surface and installation site If there are foreign objects such as iron filings, burrs, dust, etc. in the INA bearing, the bearings will generate noise and vibration during operation, and even damage the raceway and rolling elements. Therefore, before installing the bearings, you must ensure that the mounting surface and the installation environment are clean. 5. When lubricating the bearing, the more grease is not coated, the better the lubrication of the INA bearing. The more grease is applied, the better. This is a common misconception. Excessive grease in the bearing and bearing chambers will cause excessive agitation of the grease, resulting in extremely high temperatures. The amount of lubricant filled in the rolling bearing is preferably 1/2 to 1/3 of the internal space of the bearing, and should be reduced to 1/3 at high speed. 6. The radial clearance of the bearing is not as small as possible. Not all INA bearings require a minimum working clearance. You must select the appropriate clearance according to the conditions. In GB 4604-93, the radial clearance of rolling bearings is divided into five groups - 2 groups, 0 groups, 3 groups, 4 groups, 5 groups. The clearance values ​​are from small to large, and 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, conventional temperature and common interference fit; rolling bearings with high temperature, high speed, low noise, low friction and other special conditions should use large radial clearance; Small radial clearance should be used for precision spindles and bearings for machine tool spindles; a small amount of working clearance can be maintained for roller bearings. In addition, there is no play for the separate type of bearing; finally, the working clearance after the bearing is installed is smaller than the original clearance before installation, because the bearing is subject to a certain load rotation, and the INA bearing fit and load are generated. The amount of elastic deformation. After the bearing is installed, check the operation in order to check if the installation is correct. The small machine can be rotated by hand to confirm whether the rotation is smooth. The inspection items have poor operation due to foreign matter, scratches, and indentations. Due to poor installation, the torque generated by the mounting of the mount is unstable, and the torque is too large due to too small clearance, installation error, and sealing friction. Wait. If there is no abnormality, the power running can be started. The power running starts from the no-load low speed and slowly increases to the rated operation of the specified conditions. The items to be checked during the test run are whether there is abnormal sound, INA bearing temperature change, lubricant leakage or discoloration, etc. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary. The bearing temperature can generally be estimated based on the external temperature of the bearing housing. However, it is more accurate to directly measure the temperature of the outer ring of the bearing by using the oil hole. The rolling bearing temperature gradually increases from the start of the operation, and the temperature is usually stable after 1 to 2 hours. If the bearing is poorly installed, the temperature will rise sharply and an abnormally high temperature will occur. The reasons are such as excessive lubricant, too small INA bearing clearance, poor installation, excessive friction of the sealing device, and the like. The rotation of the bearing is checked with a stethoscope, etc., and there are strong metal noise, abnormal sounds, irregular sounds, etc. to explain the abnormality. The reasons are poor lubrication, poor accuracy of the shaft or housing, bearing damage, and foreign matter intrusion. Material :Natural slate , quartz,sandstone ,marble etc .
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