Cleaning, overhaul and judgment of nsk bearings

1, the cleaning of the bearing

When disassembling the lower bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the lubricant, and clean 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. 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, use a brush to remove the grease and 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 solution. In addition, the cleaning oil should always be kept clean.

2. Inspection and judgment of bearings

In order to judge whether the removed bearing can be reused, check the bearing after cleaning, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the bearing clearance and whether there is dimensional accuracy. Falling damage, abnormality. For non-separable ball bearings, use one hand to support the inner ring horizontally, and turn the outer ring to check if it is in a smooth rotation.

Separate bearings such as tapered 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, the more careful inspection is required.

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IKO tapered roller bearing vibration maintenance detection method

Maintaining the bearing is a necessary condition for the operation of the tapered roller bearing. The common maintenance is to lubricate the IKO bearing. When reading how to select the lubrication method of the bearing, under the premise of understanding the lubrication mode of the bearing, it is also known to the maintenance of the bearing system. It is necessary to let us see how to carry out bearing lubrication maintenance.

1. Keep the bearing lubricated clean

Before inspecting the tapered roller bearing, the surface of the bearing should be cleaned first, and then the oil seal of the bearing and its surrounding parts should be carefully inspected. If there are any bad symptoms, be sure to replace it. The bad oil seal will cause damage, making IKO The bearing cloud is not normal and the equipment is shut down.

2. Pay attention to cover exposed bearings

When inspecting tapered roller bearings, do not expose the bearings to contaminants or moisture. If the work is interrupted, the machine should be covered with a piece of oil-paper plastic or similar material. If the unshielded bearing is cleaned without performing disassembly and may be inspected, use a brush for application to clean with a petroleum solvent, then dry it with a lint-free cloth or blow it with compressed air (be careful not to let The bearing assembly starts to rotate). Check the track surface, retainers and beads of the IKO bearing with a small mirror and a probe similar to that used by dentists. Do not clean the bearing with a sealing cover or dustproof; just wipe the outer surface. If the bearing is damaged, it needs to be replaced. Replacing bearings during regular downtime maintenance is far more economical than the loss of sudden downtime selected due to damage to the array.

3. Check the lubricant of the bearing

Lubricants are important not only for bearings but also for all bearings. However, please note that it is not advisable to add too much grease to tapered roller bearings. Then it is to replace the lubricant of the bearing. Bearings lubricated with oil should be refilled with fresh oil and allowed to rotate at low speed for a few minutes if the old oil is drained. As much as possible, allow the oil to collect the contaminants from the wreckage and then vent the oil. For grease-lubricated IKO bearings, when replacing grease, the cutter used should avoid any contact with the cotton material in any part of the bearing. Since these residual fibers may be wedged between the rolling elements and cause damage, in particular the application of the bearing needs to pay attention to this problem.

When the waviness of the component is closely matched between the bearing ring and the bearing housing or the transmission shaft, the bearing ring may be deformed in cooperation with the shape of the adjacent component. If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the housing and drive shaft to the required tolerances.

Local damage A small number of bearing raceways and rolling elements may be damaged due to handling or installation errors. In operation, rolling a damaged bearing component produces a specific vibration frequency. Vibration frequency analysis identifies damaged bearing components. Vibration Behavior in Applications In many applications, the stiffness of an IKO bearing is the same as the stiffness of the surrounding structure. Due to this feature, it is possible to reduce the vibration in the application as long as the bearings (including preload and clearance) are properly selected and their configuration in the application.

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