Standard method and lubrication maintenance for installing NSK rolling bearings

Since the rolling bearings are rust-proofed and packaged, do not open the package until installation.
In addition, the anti-rust oil coated on the bearing has good lubricity. For general-purpose NSK bearings or grease-filled bearings, it can be used without cleaning. However, for instrument bearings or bearings for high-speed rotation, the cleaning oil should be washed with a clean cleaning oil. The bearing is prone to rust and cannot be placed for a long time.
Clean the bearing and the casing to confirm the burrs left by scratches or machining. There must be no abrasive (SiC, Al2O3, etc.) sand or chips in the outer casing.
Secondly, check whether the size, shape and processing quality of the shaft and the casing are in accordance with the drawings.
The method of installing the rolling bearing depends on the fit, condition and structure of the NSK bearing. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings, press with multiple presses, or use hot charging methods. For taper holes, mount directly on the taper shaft or with a sleeve.
When installed in the outer casing, the general clearance fits a lot, and the outer ring has an interference amount, which is usually pressed by a press or a cold shrink fit method after cooling. When dry ice is used as the coolant and the shrinkage is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate rust prevention measures are required.
Mounting bearing: Whether the rolling bearing is installed accurately, affecting accuracy, life and function. Therefore, the bearing installation plan and the disassembly part are enriched. I hope I can install it according to my homework. The names of the homework scales are as follows:
(1) Clearing and bearing related components;
(2) Check the size and packing components related to the case;
(3) installation;
(4) Checking after bearing installation;
(5) A smoothing agent supplied.
Just close the packaging bearing before installation. Generally smooth grease is smooth, not clean, and directly adds smooth grease. Smooth oil, generally not clean, but use instruments or high-speed bearings and clean with clean oil to remove the rust inhibitor applied to NSK bearings. Remove the bearing, rust and rust inhibitor, we can't open it. In addition, it has been sealed up, the VTC grease bearing, not washed directly. The mounting method of the bearing differs depending on the bearing layout and the premise. Generally, more shafts are twisted, and the inner ring nuisance is suitable for the request.

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FAG spherical roller bearing damage maintenance measures maintenance method

1, the cleaning of the bearing
When disassembling the lower roller bearing for inspection, first record the appearance of the FAG bearing, confirm the residual amount of the lubricant, and then wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the FAG bearing does not directly contact the container. When rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.
Fine washing is to carefully clean the spherical roller bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.
2. Inspection and judgment of bearings
In order to judge whether the disassembled spherical roller bearing can be reused, it is necessary to check after the bearing is cleaned, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the FAG bearing clearance and Whether there are damages or abnormalities in which the dimensional accuracy is lowered. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.
Separate bearings such as spherical roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.
Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of FAG bearings, the more careful inspection is required.
The judgment of whether or not to reuse is determined in consideration of the degree of bearing damage, mechanical properties, importance, operating conditions, and the period until the next inspection. However, if the following defects are not available, the new spherical roller bearings must be replaced:
(a) cracks or notches on any of the inner ring, the outer ring, the rolling elements, and the cage;
(b) rupture on any of the ferrules and rolling elements;
(c) Significant jams on the raceway surface, ribs and rolling elements;
(d) the cage is worn significantly or the rivet is significantly slack;
(e) There is rust and injury on the raceway surface and the rolling elements;
(f) There are severe indentations and marks on the raceway surface and rolling elements;
(g) The inner diameter of the inner ring or the outer diameter of the outer ring has obvious creep;
(h) discoloration due to heat;
(i) Bearings sealed with grease, the seal or dust cover is damaged.

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