Causes and countermeasures of the oil film bearing burning in the roller box of high-speed wire finishing mill.

Oct 18, 2024

In high-speed wire production lines, the burning of oil film bearings in the roller box of high-speed wire finishing mills has always been an important factor restricting production efficiency and product quality. The burning of oil film bearings will not only cause equipment shutdown and production interruption but also cause high maintenance costs and spare parts consumption. This article will introduce the causes and countermeasures of oil film-bearing burning.

1. Causes of oil film-bearing burning.

Oil pollution and excessive water content

Oil pollution is one of the main reasons for oil film-bearing burning. During the rolling process, cooling water may penetrate the box through the gap of the seal, resulting in excessive water content in the oil. Water will destroy the stability of the oil film and reduce the load-bearing capacity of the oil film, thereby accelerating the wear and burning of the bearing. In addition, solid particles such as rust and iron oxide may be mixed into the oil, and these impurities will also aggravate the wear of the bearing.

Seal failure

Seal failure is also an important cause of water ingress to the roller box. During long-term use, seals such as double-lip seals and O-rings will experience wear and aging problems. If they are not replaced in time or adjusted improperly, cooling water will penetrate the box. In addition, the increase in the gap between the sealing plate and the 8-shaped plate will also cause water to enter the roller box.

Assembly accuracy and improper operation

The assembly accuracy and operation specifications of the roller box have a direct impact on the operating status of the oil film bearing. Errors and improper operation during the assembly process, such as unreasonable eccentric disc size and damage to the inner coating of the oil slinger, will affect the operation and stability of the oil film. At the same time, if the operator needs to maintain and inspect the equipment in place, it will also lead to equipment failures that are not discovered and handled in time.

Lubrication system problems

The performance of the lubrication system directly affects the lubrication effect of the oil film bearing. Suppose the parameters such as the oil supply pressure and oil supply temperature are set unreasonably, or the oil cleanliness needs to meet the standard. In that case, it will affect the formation and load-bearing capacity of the oil film. In addition, more drainage and dehydration capacity of the oil tank will also prevent the water content in the oil from exceeding the standard.

2. Countermeasures and Suggestions

Strengthen oil management and monitoring.

Periodically test and analyze the oil to ensure that the cleanliness and moisture content of the oil is within the allowable range. At the same time, strengthen the drainage and dehydration of the oil tank and use efficient vacuum dehydration devices to reduce the moisture content in the oil. In addition, the oil should be filtered and replaced regularly to ensure the stable performance of the oil.

Optimize the sealing structure and seal selection.

Optimize the design of the sealing structure to ensure the sealing effect of the seal. Select high-quality seals and regularly check and maintain the status of the seals. For seals with severe wear, they should be replaced in time to prevent cooling water from penetrating the box.

Improve assembly accuracy and operating skills.

Strengthen the training and skill improvement of assembly personnel to ensure the assembly accuracy and operational standardization of the roller box. During the assembly process, the assembly should be carried out strictly in accordance with the assembly process, and the assembly dimensions should be strictly checked. At the same time, strengthen the training and assessment of operators to improve their maintenance and inspection capabilities of the equipment.

Improve the lubrication system.

Optimize and improve the lubrication system to ensure that parameters such as oil supply pressure and oil supply temperature are set reasonably. Strengthen the inspection and maintenance of the lubrication system to detect and handle faults in a timely manner. At the same time, regularly drain and dehydrate the oil tank to maintain the stable performance of the oil.

Strengthen equipment monitoring and fault prevention.

Regularly check the vibration, bearing temperature, water content of the lubrication system and oil cleanliness of the rolling mill every shift. Use the time of changing specifications to check the wear of the lip seal and the oil thrower to ensure that the oil circuit is unobstructed. In addition, an equipment failure prevention mechanism should be established to predict and prevent possible failures.

In summary, the burning problem of the oil film bearing of the high-speed wire finishing mill involves many aspects, and it is necessary to carry out comprehensive management from multiple aspects such as oil management, seal selection, assembly accuracy, lubrication system and equipment monitoring. By taking a series of effective measures and countermeasures, the burning rate of the oil film bearing can be significantly reduced, and the service life and production efficiency of the equipment can be improved.