Bearing Surface Grinding Defects Causes and Countermeasures
Grinding is the most used method in the machining process of bearings and other parts. The purpose of grinding is mainly to refine the surface and reduce the surface roughness of the bearing surface. However, due to various factors, during grinding, various surface defects may occur, such as scratch or uneven surface. The study of the causes and countermeasures of these defects helps to improve the quality and efficiency of machining.
1. Causes of Bearing Surface Grinding Defects
The common surface defects of the bearing grinding process are: surface grinding, chipping, scratches, burning, holes and so on. The main causes of these defects are as follows:
(1) The grinding force is too large: The grinding force is too large and the grinding wheel is overloaded to form a groove on the surface of the bearing. Also, the large grinding force speeds up the grinding wheel abrasive wear and eliminate the boundary layers on both sides of the grinding wheel to generate a muddy grinding phenomenon.
(2) Poor grinding selection: Grinding is a cutting process, and the grinding wheel itself is the cutting tool. The selection of grinding wheel is related to the progress of grinding process. A wrong grinding wheel will lead to poor grinding efficiency and poor processing quality.
(3) Poor grinding fluid selection: Generally, grinding fluid is essential in the grinding process, so we should select suitable grinding fluid. However, due to improper selection, the grinding fluid cannot play a significant role during grinding process and will cause a lot of defects, such as chipping of the parts.
(4) Improper grinding process parameters: In the grinding process of the bearing surface, the grinding parameters play an important role. If the grinding parameters are incorrect, it will cause a series of problems, such as scratch on the surface of the bearing, thus affecting the final accuracy of the surface of the bearing.
2. Countermeasures of Bearing Surface Grinding Defects
(1) Grinding force regulation: The grinding force should not be too large when grinding the bearing surface. When grinding, the grinding force should be adjusted according to the composition and properties of the grinding wheel and the bearing, so as to ensure the efficiency of the grinding wheel and the accuracy of the grinding surface of the bearing.
(2) Proper selection of grinding wheel: In the grinding process, the grinding wheel should be selected according to the hardness, shape and size of the bearing, so as to ensure the effect of grinding and avoid grinding defects.
(3) Proper selection of grinding fluid: The choice of grinding fluid is also very important. We should consider the aspects of space and noise when selecting the grinding fluid to ensure that the grinding fluid can play a significant role in the grinding process.
(4) Process Parameter Regulation: The process parameters should be adjusted scientifically. Generally, the grinding speed should be lower, the feed rate should be smaller, and the process parameters should be adjusted with reference to the type of grinding wheel and the bearing material.
3. Conclusion
In summary, the surface defects of bearing grinding mainly include scratches, grinding, burning holes, chipping and so on. The main causes of these defects are the excessive grinding force, improper selection of grinding wheel and grinding fluid, and improvising of process parameters. In order to reduce the defects in the grinding process of bearing surface, we must take corresponding countermeasures according to the causes. In the selection of grinding wheel and grinding fluid, the properties of bearing and grinding wheel and the process requirements of grinding process should be taken into account. Meanwhile, scientific and reasonable process parameters should be selected to ensure the influence of surface grinding defects on the bearing performance.
