When installing the INA rolling bearings puzzle answers common questions
First, how to choose the grease?
Lubrication has a very important impact on the operation and life of INA bearings, here to brief you choose grease general principles. Grease the base oil, thickener and additives, grease performance of different types and different brands of the same species vary greatly in different rotation limit allowed, the choice is important to note. Is mainly determined by the performance of the grease base oil, low viscosity base oils generally suitable for low temperature, high speed, high viscosity at high temperature, high load. Thickeners are also related to the lubricating properties, grease thickeners water determines the water resistance. In principle, you can not mix greases of different brands, and even the same kind of grease thickeners, also because of different additives adversely affect each other.
Second, the bearings must be cleaned before installation?
Bearing surface is coated with anti-rust oil, you must use gasoline or kerosene to clean carefully cleaned and then coated with a clean high-quality or high temperature grease before installation. Cleanliness of rolling bearing life and impact of noise and vibration is very large. But we want to remind you that: fully enclosed bearings do not need to clean fuel.
Third, how to install and remove?
Do not hammer directly INA Bearing face and non-face installation force should be briquetting, sleeve or other installation tool (tooling) uniform bearing force, do not pass through the rolling power installation. If the mounting surface coated with oil, will make the installation more smoothly. Such as interference with larger bearings should be placed within the mineral oil is heated to the installation as soon as possible after 80 ~ 90 ℃, and strictly control the oil temperature does not exceed 100 ℃, in order to prevent tempering effect of reducing hardness and impact dimensions recovery. When removing the difficulties, we recommend that you use the removal tool to pull out while the inner ring carefully poured hot oil, heat causes expansion of the rolling bearing inner ring, making it easier to fall off.
Fourth, the mounting surface and installation site requirements?
Yes it is. If the INA bearing iron filings, burrs, dirt and other foreign matter entering the bearings will make noise and vibration during operation, or even damage the raceways and rolling elements. So, before installing the bearing, you must make sure to clean the mounting surface and installation environment.
Fifth, when lubricated bearings, oil coated better?
INA bearing lubrication, oil coated the better, which is a common misconception. Bearings and bearing interior excess grease will cause excessive fat stirring, resulting in extremely high temperatures. Filling quantity of lubricant to the rolling bearing inside the bearing space filled with 1/2 to 1/3 is appropriate, when the high-speed reduction to 1/3.
Sixth, the bearing radial clearance smaller better?
Not all INA bearings require minimal clearance work, you must choose the appropriate clearance according to the conditions. GB 4604-93, the bearing radial clearance is divided into five groups of Group 2, 0, group 3, group 4 and group 5, followed by small to large clearance values, where 0 is the standard clearance group. The basic radial clearance group for general operating conditions, temperature, and commonly used conventional interference fit; Rolling in special conditions of high temperature, high speed, low noise, low friction work are advised to use a large radial clearance; right precision spindle, machine tool spindle bearings should choose a smaller radial clearance; roller bearings can be maintained for a small amount of clearance work. In addition, the separated type bearings are indifferent clearance; Finally, the installed capacity of the bearing clearance after work, than the small original clearance before installation, because the bearings to withstand a certain load rotation, as well as cooperation and load bearing INA arising elastic deformation.
After bearing installation, in order to check for proper installation, operation should be checked. Small machines can be rotated by hand to verify rotate smoothly. Check the items are dysfunctional because nick, indentation caused due to poor installation, poor mount the torque generated by the processing of instability, torque due to the clearance is too small, the installation error, seal friction caused by too large and so on. If no abnormal power operation can begin.
Power operation, from the low-load starts to slowly improve the conditions set forth in rated operation. Commissioning items to check whether there is abnormal sound, INA bearing temperature, so leakage of the lubricant or discoloration. If abnormal, should be immediately discontinued operation, inspection machinery, if necessary, to remove the bearing inspection.
Bearing temperature, and can speculate based on external temperature of the bearing seat. But the use of direct measurement of the bearing outer ring hole temperature is more accurate. Rolling temperature is gradually increased from the start of the operation, the temperature is usually 1 to 2 hours after steady. If the bearing mounting bad, the temperature will soar, abnormal high temperature. The reason for such a lubricant too, INA Bearing clearance is too small, poor installation, seal friction and too big.
Turn the sound INA bearings with a stethoscope and other tests, there is a strong metal noise, abnormal sound, sound, etc. Exceptions irregular. The reasons are poor lubrication, shaft or bad bearing accuracy, bearing damage, foreign invasion and so on.