Hengding hub said bearing in the installation process, the emergence of the scar of the main reasons is: bearing is device, when assembling the emergence of inner and outer rings of skew; perhaps is is assembling device and the process of the emergence of strikes, load, and ultimately the formation of scar to emerge in the bearing.
Is bearing device to be in accordance with the job specification to stop, will not form many achievements, such as devices in the form or method not when, it will form a bearing rolling on the surface of the road surface and Gulu formed the emergence of linear bearing the scars. Device of deep groove ball bearings with indirect reaction precision, and use the function of bearing life.
Bearing quality and other aspects, although it is relatively good, but the rolling bearings are precision components, its use must be carefully carried out accordingly. No matter how high the performance of the bearings, if used improperly, it will not be expected to high performance. Note on the use of bearings have the following several:
(1) clean the bearing and its surroundings.
Even the eyes can not see the small dust, but also will bring bad impact on the bearing. Therefore, to keep the surrounding clean, so that the dust does not cause intrusion bearing.
(2) use of caution.
Bearing a strong impact on the use of the bearing, will produce scars and indentation, as the cause of the accident. In serious cases, will crack, fracture, so we must pay attention to.
(3) using appropriate tools.
To avoid using existing tools instead, you must use the appropriate tools.
(4) to pay attention to the corrosion of bearing.
Operating bearing, the sweat on the hand will become the cause of rust. Should pay attention to the use of clean hands, it is best to try to bring gloves.
Hengding hub said in order to achieve the effect a permanent cure, in general, to control bearing of noise effects, must be aimed at the noise causes to take countermeasures. The main approach is:
(1) select low noise cylindrical roller bearing;
(2) to avoid resonance with the host, to avoid the resonance sensitive speed;
(3) try to eliminate the noise from the application of cylindrical roller bearings;
(4) additional measures for noise reduction and noise reduction when other methods are not effective.
When the bearing temperature rise, the first to determine whether the false action, such as the rise, should do the following treatment:
Check the cooling water pressure, water flow and piping system is normal. If the water pressure is low may be filter clogging, can not be handled in a timely manner, can be shut down, when the confirmation can work, and then put into use.
Should check the governor's hydraulic pressure, if low oil pressure may lead to the closure of the cooling water hydraulic valve.
Check bearing whether there is abnormal sound, and detection of cylindrical roller bearings, whether there are abnormal swing.
Oil sampling observation of oil color is changing, and tests to see if spoilage. If the deterioration of the confirmation, should be shut down to replace the new oil.
Check oil level is normal, if normal, check whether the tank vent valve shut. If you have secured, fill oil, if the seal oil leakage, should stop processing.
Three factors of bearing failure
1 contact fatigue failure
Contact fatigue failure is the failure of bearing working surface under the action of alternating stress. Contact fatigue spalling occurred on the surface of the sliding bearing, often accompanied by fatigue crack, first of all from the contact surface following the largest alternating cut stress produced, and then extended to form different flake shape on the surface, such as point like peeling or pitting corrosion, peeling off into small flakes are shallow flaking says. Due to the gradual expansion of the peeling surface, and often to the deep expansion, the formation of deep peeling. Deep peeling is the source of contact fatigue failure.
The failure of 2 clearance change
Bearing in the work, due to the impact of external or internal factors, the original clearance change, the accuracy is reduced, and cause "killed" known as the clearance change failure. External factors such as the amount of interference is too large, installation is not in place, the temperature rise caused by the amount of expansion, instantaneous overload, internal factors such as residual austenite and residual stress in the unstable state is a major cause of failure of the clearance change.
3 wear failure
Wear failure refers to the relative sliding friction between the surface of the work surface and the failure of the metal. Continuous wear will cause damage to the bearing parts, and ultimately lead to the loss of sliding bearing size and other related issues. Wear may affect the shape change, increased clearance and surface morphology changes may affect lubricant or its pollution reaches a certain degree and cause the loss of lubrication function, thus bearing the loss of rotational accuracy and can not operate normally. Hengding hub said wear failure is all kinds of bearing the common failure mode of, according to the wear form usually can be divided into the most common grinding abrasive wear and adhesive wear.
First of all, the structure design is reasonable at the same time with advanced, will have a longer bearing life. Hendin said wheel bearing manufacturing generally after forging, heat treatment, machining, grinding and assembling multi-channel processes. The rationality of the processing technology, advanced nature, stability will affect the life of the bearing. Which affects the quality of the finished product bearing the quality of heat treatment and grinding process, often with the failure of the bearing has a more direct relationship. In recent years, the research on the modification of the bearing working surface shows that the grinding process is closely related to the surface quality of the bearing.
The metallurgical quality of bearing materials was the main factor affecting the early failure of rolling bearing. With the progress of Metallurgical Technology (such as vacuum degassing of bearing steel, etc.), the quality of raw materials has been improved. Raw material quality factors in the bearing failure analysis of the proportion has decreased significantly, but it is still bearing failure is one of the main factors.
