**Analysis of the Causes of Several Grinding Marks on Bearings During the Grinding Process**
Home > Bearing Knowledge > Analysis of the Causes of Several Grinding Marks on Bearings During the Grinding Process
Source: China Bearing Network | Time: May 18, 2014
During the grinding process, bearings are subjected to high-speed rotation of a grinding wheel. If not properly operated and adjusted according to the manufacturer's instructions, various imperfections may appear, which can affect the overall quality of the bearing. In the fine grinding stage, where precision is crucial, visible grinding marks on the surface of the workpiece are common.
One of the most noticeable types of grinding marks is the interpenetrating spiral pattern. This usually occurs when the grinding wheel has poor flatness, resulting in a wavy or uneven surface. When the grinding wheel comes into contact with the workpiece, it only touches slightly. As the workpiece or the grinding wheel moves back and forth several times, the irregularities on the wheel can create spiral patterns that are visible to the naked eye. The pitch of these spirals depends on the speed of the worktable, the rotational speed of the workpiece, and whether the grinding wheel axis is parallel to the worktable rail.
Common causes for such spiral marks include:
1. Poorly dressed grinding wheels with sharp edges and no chamfering.
2. Excessive lubricating oil on the workbench guide rails, causing the workbench to float.
3. Low machine tool accuracy.
4. Excessive grinding pressure applied during the process.
Another type of grinding mark appears when the V-shaped guide rail lacks rigidity. This can cause the grinding wheel to shift during operation, resulting in only the edge of the wheel making contact with the workpiece. Additionally, unstable workbench speed during repairs, insufficient wheel dressing, or a workpiece with poor rigidity can also lead to irregular grinding patterns. Residual debris, such as broken abrasive particles or metal shavings, sticking to the grinding wheel’s surface can further contribute to uneven finishes. To prevent this, the grinding wheel should be cleaned or rinsed with coolant after use.
Good wheel dressing is essential to ensure a smooth and even surface, avoiding bumps or irregularities that could transfer to the workpiece.
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This article was originally published on China Bearing Network. For more information, visit [China Bearing Network](http://www.chinabearing.net).
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