How to clean and judge whether to replace SKF cylindrical roller bearing

When disassembling the lower bearing inspection, first record the appearance of the SKF cylindrical roller bearing, confirm the residual amount of the lubricant, and 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 bearing does not directly contact the container. In rough cleaning, if the bearing is rotated with dirt, it will damage the moving surface of the SKF cylindrical roller bearing, so you should pay attention to it. 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 bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.

2. Inspection and determination of SKF cylindrical roller bearings

In order to determine whether the removed SKF cylindrical roller bearing can be reused, check the SKF cylindrical roller bearing after cleaning. Carefully check the raceway surface, the dynamic spring surface, the state of the mating surface, the wear of the cage, and the bearing clearance. The increase and the presence or absence of damage and abnormality regarding the decrease in dimensional accuracy. 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 SKF cylindrical roller bearings such as tapered roller bearings can be inspected separately for the raceway surface of the moving body and the outer ring.

Because large bearings cannot be rotated by hand, pay attention to checking the appearance of moving bodies, raceways, cages, ribs, etc. The higher the importance of bearings, the more careful inspection is required.

The determination of whether it can be reused is determined by considering the damage degree, mechanical function, importance, operation premise of the German SKF cylindrical roller bearing, and the period until the next inspection. However, if there are the following defects, they can no longer be used, and new bearings must be replaced:

(a) cracks or gaps in any of the inner ring, the outer ring, the moving body and the cage;

(b) There is a break in any of the ferrule and the moving body;

(c) obvious jamming on the raceway surface, ribs and moving body;

(d) The cage is significantly worn or the rivet is significantly slack;

(e) There is rust and injury on the raceway surface and the moving body;

(f) There are severe indentations and marks on the raceway surface and the moving body;

(g) There is significant creep in the inner diameter surface of the inner ring or the outer diameter surface of the outer ring;

(h) significant discoloration due to heat;

(i) SKF cylindrical roller bearings sealed with grease, and the seal or dust cover is damaged.

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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.

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