The correct installation of TIMKEN bearings affects accuracy, life and performance. Therefore, the design and assembly department should fully study the bearing installation. Hope to install according to the operation standard.
The work standard items are usually as follows:
Check the size and finishing of related parts;
Installation;
Supply lubricants;
Cleaning TIMKEN bearings and TIMKEN bearing related parts;
Inspection after installing TIMKEN bearing;
The TIMKEN bearing packaging was opened just before installation. Lubricating oil is not necessary to be cleaned, but TIMKEN bearings for instruments or high-speed bearings should be cleaned with clean oil to remove the anti-rust agent applied to TIMKEN bearings. General grease is lubricated and filled with grease directly without cleaning. Furthermore, bearings that have been sealed with grease are used without cleaning. The TIMKEN bearing with the anti-rust agent removed is easy to rust, so it can not be left unattended. TIMKEN 22216 EJW33C3 bearings online , pls click here :
When installed to the shell, there is usually a large amount of clearance fit, and the outer ring has an interference amount. It is usually pressed in with a press, or there is a cold shrink fit method for installation after cooling. Dry ice is used as a coolant, and when shrink-fitting is installed, moisture in the air will condense on the surface of the TIMKEN bearing. Therefore, appropriate anti-rust measures are required.
The installation method of TIMKEN bearing varies with bearing structure, fit and conditions. Generally, since most of them are shaft rotation, the inner ring needs an interference fit. In case of tapered hole, install it directly on the taper shaft, or install it with a sleeve. Cylindrical hole TIMKEN bearings are usually pressed in with a press or hot-packed.
After the TIMKEN bearing is installed, it needs to be carefully adjusted and straightened, which may cause the TIMKEN bearing to suffer additional load, friction and vibration. This may accelerate fatigue and reduce life, and may damage the life span of other machine parts. In addition, vibration and friction may greatly increase and the risk of premature failure.
During operation, the bearing requires correct relubrication to perfect its performance. TIMKEN bearing lubrication methods are divided into grease lubrication and oil lubrication. In order to make TIMKEN bearings function well, first of all, we must choose a lubrication method suitable for the conditions of use and purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. But grease lubrication has the advantage of simplifying the structure around TIMKEN bearings.
When the TIMKEN bearing will reach its end-use period, it should be replaced. Although bearings can no longer be used, but the right to remove the original TIMKEN bearings, timely replacement of new TIMKEN bearings, new bearings for extended life can play a good role in promoting. Firs, the use of tools for proper removal methods will help prevent damage to other machine components, and second, incorrect removal techniques may cause harm to the operator.
During the use process, the basic external conditions of TIMKEN bearing operation must be monitored frequently, such as temperature monitoring, vibration and noise measurement.The production plan can be realized and the plant productivity and efficiency can be improved. TIMKEN 33281 bearings online , pls click here :
After the installation of TIMKEN bearings is completed, in order to check whether the installation is correct, a running inspection is required. Small machinery can be rotated by hand to confirm whether it rotates smoothly. The inspection items include poor operation due to foreign objects, scratches, and indentations, unstable torque due to poor installation, poor processing of the mounting seat, excessive torque due to too small clearance, installation errors, and seal friction, etc. Wait. If there is no abnormality, power operation can be started. Large machinery cannot be rotated manually, so the power is cut off immediately after no-load start, the machine is idling, check whether there is vibration, noise, whether the rotating parts are in contact, etc. After confirming that there is no abnormality, enter the power operation. The power operation starts from the no-load low speed and gradually increases to the rated operation under the specified conditions. The items to be checked during the trial operation are whether there is abnormal sound, changes in the temperature of the flat bearing, leakage or discoloration of lubricant, etc. If an abnormality is found, the operation should be stopped immediately, the machine should be inspected, and the bearing should be removed for inspection if necessary.
The temperature can generally be estimated based on the external temperature of the bearing housing. However, it is more accurate to use the oil hole to directly measure the temperature of the outer ring of the TIMKEN bearing. The bearing temperature gradually increases from the start of operation, and the temperature is usually stable after 1 to 2 hours. If the bearings are not properly installed, the temperature will rise sharply and abnormally high temperatures will appear. The reasons are too much lubricant, bearing clearance is too small, poor installation, excessive friction of the sealing device, etc. In the case of high-speed rotation, the wrong choice of structure and lubrication method is also the reason.
Keep bearings and their surroundings clean
Even small dust that is invisible to the eyes can have a bad effect on TIMKEN bearings. Therefore, keep the surrounding clean so that dust will not invade the plane bearings.
Use with care
When the bearing is used, the TIMKEN bearing will be strongly impacted, which will cause scratches and indentation, which will cause the accident. In severe cases, cracks and breaks may occur, so care must be taken.
Use appropriate operating tools
Avoid using existing tools instead, you must use appropriate tools
Pay attention to the corrosion of plane bearings
When operating bearings, sweat on your hands can cause rust.
Pay attention to use clean hands, it is best to wear gloves as much as possible.
It is very important to understand how to use TIMKEN bearings will achieve twice the result with half the effort.
When the mechanical parts near the bearing have been lubricated with oil or need to rely on lubricating oil to dissipate heat, the bearing should be lubricated with oil. When the bearing is under heavy load or high speed, or when external heat is introduced, there may be heat dissipation requirements.
The use of trace lubrication methods, such as drip oil lubrication, oil mist lubrication or oil-air lubrication, can ensure that the oil loss and bearing friction are very small.
When using air as a carrier, it can directly supply oil and make the airflow help to seal.
Where flat bearings have extremely high speeds and require good cooling of the suburban fruit, a large amount of lubricating oil can be sprayed directly onto all contact surfaces.
Most TIMKEN bearing failures are normal under proper lubrication and sealing, installation and maintenance conditions, because when the rolling body rolls along the ring, the contact seal of the object has different contact stress. After a certain number of cycles, the stress will produce micro cracks on the lower surface. The penetration and squeezing of lubricating oil can cause micro-cracks and pitting.
Under excessive static load and impact load, uneven plastic deformation pits will appear on the roller or raceway of the ring. This usually occurs in bearings with very low speeds or oscillations.
Imported TIMKEN bearing failure is easy to wear when the seal is unreliable and dusty. Sliding friction usually exists between the roller and the ring, especially between the roller and the cage. If the lubrication is not good and the heating is serious, the roller may be tempered and even cause adhesive wear. The higher the speed, the more severe the wear.
In addition, due to improper installation, disassembly and operation will also cause damage to bearing parts, such as breakage, should be avoided.
The design constraints that should be satisfied in the verification are mainly to avoid bearing failure and ensure the normal operation of the bearing within the specified time. In general, the main failure modes of bearings under different working conditions are different. For TIMKEN bearing failure, fatigue pitting corrosion is its main form of failure. The design constraints are to ensure that the bearing has sufficient fatigue life, and should be checked according to the fatigue life. For high-speed bearings, high temperatures often lead to excessive wear and minor injuries. Design constraints not only ensure that the bearing has sufficient fatigue life, but also restrict its speed not to exceed the limit value, that is, except for high-speed bearings. In addition to life calculation, but also bi shall check the bearing speed limit. For bearings that do not rotate or rotate at low speeds, the main form of failure is excessive plastic deformation. TIMKEN bearing failure design constraints are designed to prevent excessive plastic deformation, which requires a static strength check.
In addition, the rational design of the bearing combination structure to ensure adequate lubrication and reliable sealing is essential to improve the bearing life and ensure normal operation.
Bearing fault detector can detect the lubrication and running status of various rolling bearings and sliding bearings. Through this online sampling method, you can predict bearing failures, ensure reliable operation of TIMKEN bearing failures, determine the appropriate lubricant replacement cycle, reduce maintenance labor intensity, and avoid economic losses. Bearing damage by the good integrity of the device.
Bearing Fault Detector Product parameters bearing fault detector, also known as bearing failure stethoscope, can not fen case of using the solution bearings, bearing not stop running.
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