1、 Are there any requirements for the appearance and occasion of the device? yes. If foreign matters such as iron filings, burrs and dust enter the bearing, the fag imported bearing will produce noise and vibration during operation, and even damage the raceway and rolling element. Therefore, before installing the bearing, you must ensure that the appearance and condition of the device are clean.
2、 Is it necessary to clean the fag bearing device before importing it? The bearing surface is coated with antirust oil. You must carefully clean it with clean gasoline or oil, and then Bearing Installation apply clean, high-quality or high-speed and high-temperature smooth grease before using the device.
Cleanliness has a great influence on bearing life and vibration noise. Bearing Installation However, we would like to remind you that there is no need to clean and refuel the fully sealed bearing.
3、 How to choose smooth grease? Smoothness has a very important impact on the operation and service life of bearings. Here we briefly introduce you to the general criteria for selecting smooth grease. Smooth grease is made of base oil, thickener and additives. The smooth grease functions of different varieties and unified varieties and different trademarks are very different.
The allowable torsion limit is different, so you must pay attention to it when selecting. The function of smooth grease is mainly determined by the base oil. Ordinary base oil with low viscosity is used for low temperature and high speed, and high viscosity is used for high temperature and high Bearing Installation load. Thickener is also related to the smooth function.
The water resistance of thickener determines the water resistance of smooth grease. In principle, different brands of smooth grease cannot be mixed, and even smooth grease with the same thickener will have a bad Bearing Installation impact on each other due to different additives.
4、 In smooth bearings, the more grease the better? Smooth bearings, the more grease the better, this is a common misconception. Excessive grease in the bearing and bearing chamber will form excessive mixing of grease, and then extremely high temperature will occur. The number of bearing filling smoothing agent should be 1 / 2 ~ 1 / 3 to fill the internal space of the bearing, and should be reduced to 1 / 3 at high speed.
5、 How to install and disassemble? Do not directly hammer the fag inlet bearing end face and non stressed surface when installing the device. Use pressure block, sleeve or other devices (Tooling) to make the bearing bear average stress. Do not pass through the rolling element power transmission device. If the surface of the device is coated with smooth oil, the device will be smoother.
If the common interference is large, put the bearing into mineral oil and Bearing Installation heat it to 80 ~ 90 ℃, install it as soon as possible, and strictly control the oil temperature not exceeding 100 ℃, so as to avoid tempering effect, hardness reduction and size recovery. In case of difficulties in disassembly,
it is recommended that you use the method of pulling the disassembled things outward and carefully pour hot oil on the inner ring. The heat will Bearing Installation expand the bearing inner ring and make it easier to fall.
6、 Is the smaller the radial clearance of fag imported bearing, the better? Not all bearings require small task clearance. You must select the appropriate clearance according to the premise. In national standard 4604-93, the radial clearance of rolling bearing is divided into five groups – Bearing Installation group 2, group 0, group 3, group 4 and group 5.
The fundamental radial clearance combination is used for common operation premise, conventional temperature and common Bearing Installation interference; Under the special premise of high temperature, high speed, low noise and low friction, large radial clearance should be selected for the bearing of the task;
Small radial clearance should be selected for fine spindle and fag imported bearing for machine tool Bearing Installation spindle; With regard to roller bearings, a few task clearances can be adhered to. In addition, there is no clearance for separate bearings;
Finally, the task clearance after the installation of the bearing is smaller than the original clearance before the device, because the bearing has to accept the inevitable load torsion, as well as the elastic deformation caused by the common load and load of the bearing.
Power operation, starting from no-load low speed, slowly increase to the rated operation under the specified conditions. During the test run, the inspection items are whether there is abnormal sound, the temperature change of fag inlet bearing, lubricant leakage or discoloration, etc. If any abnormality is found, stop the operation immediately, check the machinery, and remove the bearing for inspection if necessary.
The fag inlet bearing temperature can generally be inferred from the external temperature of the bearing pedestal. However, it is more accurate to directly measure the temperature of the bearing outer ring by using the oil hole. The bearing temperature rises gradually from the beginning of operation, and the temperature is usually stable after 1 ~ 2 hours.
If the bearing is not installed properly, the temperature will rise sharply, resulting in abnormal high temperature. The reasons are too much lubricant, too small bearing clearance, poor installation, excessive friction of sealing device, etc.
The rotating sound of fag imported bearing is checked with stethoscope, and there are strong metal noise, abnormal sound, irregular sound and other abnormalities. The reasons include poor lubrication, poor accuracy of shaft or bearing seat, bearing damage, foreign matter intrusion, etc.