Bearing installation

Precautions before installation

1) bearing preparation

Because of the bearing after antirust processing and packaging, so don't come not to open the packing before installation.

In addition, the bearing coating of anti rust oil with good lubrication performance, for general use of bearings or filling grease bearings, do not have to clean the direct use of. But for the instrument bearing or used for high-speed rotating bearings, the application of clean oil will rust oil wash away, then the bearing is easy to rust, can not be placed for a long time.

2) shaft and housing inspection

Clean the bearing and the shell, confirm the burr free from the wound or machining. The shell shall be absolutely abrasive (SiC, Al2O3) sand, chip etc..

The second inspection axis and shell size, shape and processing quality is consistent with the drawings.

Before installing the bearing, in the inspection of qualified shaft and casing of the coating of the mechanical oil.

Bearing installation method

The bearing installation method is different from the type of bearing and the matching condition.

Due to the general multi axis rotation, the inner ring and the outer ring can be used for interference fit and clearance fit, and the outer ring rotation, the outer ring with the interference fit.

(1) pressing in installation

Press in general installation by the press, and can also use the bolt and nut has no available hammer into.

(2) installation of hot cover

Heating the bearing in oil to make it expand and then mounted on the shaft can make the bearing avoid unnecessary external force and complete the installation work in a short time.

Heating matters needing attention:

1) general heating not more than 100 degrees celsius.

2) the bearing is not allowed to contact the bottom of the oil groove.

In addition, the heating device can also use the induction heating device to heat the bearing so that the bearing can be expanded and then installed on the shaft.

Bearing disassembly

When checking or replacing parts regularly, the bearing is required. Usually shaft and bearing boxes are almost always to be used, bearings are often used to continue to use. Therefore, the structure design should take into account the demolition of bearings, less damage to the bearing, shaft, bearing boxes and other parts, but also to prepare the appropriate removal tool. Remove static matching rings, can only increase tension in the ring, not scroll through the pull ring.

Bearing maintenance

In order to give full play to the bearing and maintain its proper performance for a long time, it is necessary to do a good job in regular maintenance (periodic inspection).

Through proper regular check, so early to find the fault, prevent the accident in the bud, to improve the productivity and economy is very important.

1, cleaning

When the bearing is removed, the first photograph and other methods are used to make a good appearance. In addition, to confirm the amount of residual lubricant and the lubricant sampling, and then clean the bearing.

A, bearing cleaning is divided into coarse and fine washing, and can be used at the bottom of the container placed on the metal grid.

B, coarse wash, in the oil with a brush, such as the removal of grease or adhesive. At this time, if the rotation of the bearings in oil, attention will be due to foreign bodies and other damage to the rolling surface.

C, fine wash, the oil in the slowly rotating bearing, must be carefully carried out.

Cleaning agents are commonly used as neutral water diesel or kerosene, sometimes using temperature as needed, such as lye. No matter what kind of cleaning agent, should always filter to keep clean.

Immediately after cleaning, the bearing is coated with rust proof oil or rust proof grease.

2, check and judge

In order to determine split bearing can be re used to check on the dimensional accuracy, precision rotation, internal clearance as well as the mating surfaces, the raceway surface, holder and sealing ring.

On the inspection results, can be used to judge the use of bearings or bearing.

The criteria for judging are different according to the mechanical properties and the importance and the inspection period. If there are any of the following damage, the bearing may not be re used, and must be replaced.

1) fracture and defect of bearing parts.

2) stripping of rolling surface material.

Bearing fault identification method

Without disassembly inspection, it is important to identify or predict whether there is a fault in the bearing in operation, which is very important to improve the productivity and economy.

The main identification methods are as follows:

1) to identify by sound

It is necessary to have a wealth of experience to identify the sound through the sound. Must be fully trained to be able to identify bearing sound and non bearing sound. To this end, it should be as far as possible to carry out this work. To use a listening device or a microphone attached to the shell to clearly hear the sound of the bearing.

2) identification by working temperature

The method belongs to the comparative identification method, which is limited to the use in the running state of the situation is not changed. To this end, a continuous record of temperature must be carried out. When a fault occurs, not only the temperature rises, but also the irregular changes.

3) to identify the status of the lubricant.

Analysis on lubricant sampling, judging by the pollution level is mixed with foreign body or metal powder etc.. The method can not be close to the observation of the bearings or large bearings are particularly effective.