Analysis of Roll Shaft Breakage

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Rolling Shaft Fracture Analysis

With the development of industry and the continual emergence of new materials, there is an increasing demand for manufacturing and machining of materials with extreme hardness and strength. Rolling is one of the most common methods used to shape materials. It involves continuously passing metal through specially designed rollers which apply force to the metal, flattening and shaping it to the desired dimensions.

However, due to the arduous nature of the process, rolling shafts are subject to potential fracture and breakage. The most common cause of a fractured rolling shaft is metal fatigue, which is caused by repeatedly bending or stretching the shaft. In extreme cases, metal fatigue can result in a complete fracture, which can cause costly delays in production.

In order to avoid catastrophic failure and disruption to the production process, it is essential to identify the root causes of rolling shaft fracture. Through careful inspection and analysis of the pieces, technicians can accurately identify the location and characteristics of the fracture, as well as its contributing factors. This can provide valuable insight into production processes and can help to prevent similar occurrences in the future.

One of the most common factors contributing to rolling shaft fracture is cause by an uneven application of force. This can be caused by a misaligned spindle, or an uneven distribution of material during the rolling process. Uneven material can cause the application of greater pressure in some spots, resulting in the shaft fracturing from the excessive strain.

Additionally, rolling shafts can also fracture due to inadequate lubrication. Poorly lubricated rolling surfaces can cause sections of the surface to rub harshly against one another, resulting in fatigue and eventual fracture.

In order to prevent rolling shaft fractures, it is essential to ensure that the rollers and spindles are correctly aligned and that the surrounding environment is properly lubricated. Regular inspections of the rolling shafts should also be implemented, as this can help to detect signs of metal fatigue before they become serious issues.

In summary, rolling shafts are susceptible to fracture and breakage, which can cause costly delays in production. To prevent this from occurring, technicians should identify the root causes of possible shaft fracture, ensuring that the rollers and spindles are correctly aligned and the environment is properly lubricated. By taking the necessary precautions and conducting regular inspections, rolling shaft failure can be avoided.

Roll damaged bearing analysis

Roll bearing is one of the most important spare parts of rolling mill, its maintenance and repair has direct impact on the working efficiency and production quality of rolling mill. This paper introduces the causes and influence of bearings damage and the relevant preventive measures.

The main causes of bearing damage are vibration, fatigue damage, thermo-elastic deformation, corrosion, surface defects and so on. In production, vibration is an important factor that affects the normal operation of bearings, due to the high speed and load of the bearing, and improper assembly. These will cause the centrifugal force to cause the bearing to vibrate during rotation, resulting in bearing damage.

In addition, fatigue damage will also cause bearing damage. As the bearing operating temperature increases, the bearing will cause thermal deformation, resulting in a significant increase in bearing clearance. At this time, hard particles caused by poor lubrication will accelerate the bearing wear. In addition, the defects of the surface of the bearing or external parts such as shaft, improperly installed shaft key, improper bearing installation and improper chamfering of the bearing hole in the bearing house will cause irreversible damage to the bearing.

In order to reduce the damage to bearings, the first is the dynamic balance of the rolls. It helps to reduce the vibration of the bearing. In the installation of shaft and bearing, the use of special bearing fitting tool is necessary to ensure the accuracy of the installation. Secondly, in the choice of oil, should pay attention to the choice of oil performance suitable for the working environment. In terms of lubrication, it is important to perform periodic lubrication to ensure that there is no wear due to insufficient lubrication.

Therefore, the analysis of bearing damage during rolling mill operation is very important. In order to prolong the service life of bearings and ensure the safety of rolling mill operation, we should do a good job of bearing regular maintenance and replace worn bearings in time to improve the production efficiency and product quality of the rolling mill.