How can I tell if a cross cylindrical roller bearing needs to be replaced?

What is cross cylindrical roller slewing ring

The cross cylindrical roller slewing ring is composed of two seats, the internal cylindrical rollers are arranged in a cross and are separated and positioned by the isolation block, and the unique structure of the roller in contact with the raceway line makes it able to bear strong axial force, radial force and overturning moment at the same time, with the advantages of high load bearing and high precision; It can realize the stable connection and flexible rotation of relatively rotary moving parts, and is widely used in hoisting machinery, construction machinery, port machinery and industrial robots and other equipment with high requirements for bearing capacity and rotation accuracy, providing a strong guarantee for the stable and reliable operation and efficient work of the equipment.

Features of cross cylindrical roller slewing rings

High load-bearing capacity: The cylindrical roller structure with cross arrangement is adopted, and the rollers are in linear contact with the raceway, which can withstand greater axial force, radial force and overturning moment than the point-contact structure, which can meet the needs of heavy equipment and high-load conditions.

High precision: the precise arrangement of the rollers and the positioning of the isolation block make the slewing ring maintain a high rotation accuracy during operation, effectively reduce the shaking and deviation during operation, and can meet some equipment with high requirements for motion accuracy, such as precision machine tools, radar antenna bases, etc.

Compact structure: The structural design of this slewing ring is more compact, occupies less space, and has more advantages in the space layout of the equipment, which is conducive to the miniaturization and lightweight design of the equipment, especially suitable for occasions with limited space but high bearing capacity.

Easy installation: its structural form makes the installation process relatively simple, generally only need to connect the two seat rings with the fixed parts and rotating parts of the equipment respectively through bolts, which can effectively shorten the assembly time of the equipment and improve the production efficiency.

High rigidity: Due to the reasonable arrangement of the rollers and the design of the seat ring, the whole has high rigidity, and the deformation is small when bearing the load, which can ensure the stability of the equipment during operation and prolong the service life of the equipment.

Good interchangeability: The standardized design and manufacture make the cross cylindrical roller slewing ring have good interchangeability, when a component is damaged, it is easy to replace the corresponding part, reducing the maintenance cost and downtime of the equipment.

Wear resistance: The selection of high-quality materials and advanced heat treatment technology makes the roller and raceway surface have high hardness and wear resistance, which can maintain good performance in long-term operation and reduce the impact of wear.

Strong adaptability: It can adapt to different working environments and working conditions, whether it is in high temperature, low temperature, humid or dusty and other harsh environments, as long as appropriate protective measures are taken, it can work reliably and has strong environmental adaptability.

How can I tell if a cross cylindrical roller bearing needs to be replaced?

To determine whether a cross cylindrical roller bearing needs to be replaced, it can be evaluated from the following aspects:

Visual inspection

Surface wear: Observe the raceway and roller surfaces of the bearing, if there are obvious wear marks, scratches, spalling or pitting, this indicates that the bearing has been damaged to a greater extent and may need to be replaced.

Deformation and cracks: Check the inner and outer rings, rollers and cages of the bearing for deformation or cracks. Especially in the case of large shock loads, bearings are prone to cracks, and once found, the bearings should be replaced immediately to avoid sudden failures.

Corrosion and rust: Check the bearing surface for corrosion or rust. If the rust is severe, it will affect the accuracy and flexibility of the bearing, reduce its service life, and generally need to be replaced.

Running sounds

Abnormal noise: The sound of the bearing in normal operation is smooth and uniform. If you hear harshness, friction, impact or other abnormal noises during operation, it may be caused by the wear, damage, or poor lubrication of the rollers and raceways inside the bearing, and further inspection is required to determine whether it needs to be replaced.

Noise changes: If the noise is significantly higher or changes irregularly than the sound used in normal operation, it may also be a sign of bearing failure.

Vibration conditions

Vibration amplitude: Feel the vibration of the bearing when it is running through vibration monitoring equipment or hand touch. If the amplitude of the vibration increases significantly beyond the normal range, it may be caused by increased clearance of the bearing, uneven roller wear, or other internal faults, which may mean that the bearing needs to be replaced.

Vibration frequency: Abnormal vibration frequency is also an important basis for judging bearing failure. When there is a vibration frequency that is different from the normal operating frequency of the equipment, it may be caused by bearing damage and requires a detailed inspection.

temperature conditions

Temperature is too high: There will be a certain temperature rise in the bearing during normal operation, but if the temperature is too high and exceeds the specified range (in general, the working temperature of the bearing should not exceed 80 - 90 °C), it may be caused by poor lubrication, overload, excessive friction inside the bearing, etc. If other factors are ruled out and the bearing temperature remains persistently high, it may indicate that the bearing has been damaged and needs to be replaced.

Abnormal temperature changes: If there is a sudden increase or large fluctuation in temperature compared to the normal operating temperature, it may also be a sign of a bearing problem.

Clearance check

Measure with professional tools: Use professional tools such as feeler gauges and dial gauges to measure the clearance of bearings. If the clearance is outside the specified range, whether it is too large or too small, it will affect the performance and life of the bearing, and it is necessary to consider replacing the bearing.

Compare the original data: Compare the measured clearance value with the original specification data of the bearing or the initial clearance value of the equipment when the equipment is installed, if the deviation is large, the bearing may have been worn or deformed, and further evaluation is required to determine whether it needs to be replaced.

Lubrication condition

Lubricant deterioration: check the quality of the lubricant, if the lubricant is found to be dark, thickened, smelly, or contains impurities such as metal chips, it means that the lubricant has deteriorated or been contaminated, and may not be able to provide good lubrication for the bearing, at this time, the lubricant needs to be replaced in time, and further check whether the inside of the bearing is affected.

Insufficient lubrication: If it is found that the bearing has serious dry friction or serious loss of grease and insufficient lubricating oil supply during operation, it will accelerate the wear of the bearing, and the lubricant should be replenished or replaced in time, and the subsequent operation of the bearing should be observed to determine whether the bearing is damaged due to lubrication problems.

In practical application, it is usually necessary to combine the above factors to determine whether the cross cylindrical roller bearing needs to be replaced. For the bearings in some key equipment, regular monitoring, fault diagnosis and other technical means can also be used to predict the service life and failure of the bearing in advance, so as to take replacement measures in time to avoid sudden failure of the equipment, affecting production and safety.

Cross cylindrical roller slewing ring supplier

As a well-known supplier of slewing bearings with 30 years’ experience, LTZC bearings is committed to providing slewing bearings with high quality and low price. The specific price needs to be comprehensively evaluated according to the size, load, material and accuracy requirements of the bearings. Please contact us if necessary.