**Analysis of Wear Marks on Bearings in Fine Grinding**
Home > Bearing Knowledge > Analysis of the Wear Marks of Bearings in Fine Grinding
Source: Bearing Network | Time: August 11, 2013
Fine grinding is a precise process that often leads to visible wear marks on the surface of the workpiece. These marks are typically spiral-shaped and can be easily observed with the naked eye. The formation of these interpenetrating spiral patterns is primarily due to poor flatness of the grinding wheel. When the wheel has uneven surfaces—either concave or convex—it comes into contact with the workpiece in a limited way during the grinding process.
As the workpiece or the grinding wheel reciprocates several times, the irregularities on the grinding wheel are transferred onto the workpiece, resulting in visible spiral marks. The spacing between these spirals depends on the speed of the worktable and the rotational speed of the workpiece, as well as the alignment between the grinding wheel axis and the worktable rail.
There are several key factors that contribute to the formation of these spiral marks:
1. **Poor Wheel Trimming**: If the grinding wheel is not properly dressed, it may have sharp edges or untrimmed coolant channels.
2. **Excessive Lubrication on Guide Rails**: Too much oil on the machine’s guide rails can cause the workbench to float, leading to instability.
3. **Low Machine Precision**: A machine that lacks proper calibration can result in uneven contact between the wheel and the workpiece.
4. **Excessive Grinding Pressure**: Applying too much pressure can cause the wheel to dig into the material, creating uneven wear patterns.
Additionally, other causes include:
1. **Inadequate Rigidity in V-Guideways**: If the V-shaped guide rails are not rigid enough, the grinding wheel may shift during operation, causing uneven contact.
2. **Unstable Worktable Speed**: During wheel dressing, if the worktable speed fluctuates, it can lead to inconsistent grinding results.
3. **Poor Workpiece Rigidity**: A workpiece that is not rigid enough can deform under pressure, affecting the grinding outcome.
4. **Contamination on the Grinding Wheel**: Accumulated debris or metal shavings on the wheel can create irregularities, so it's important to clean the wheel regularly with cooling water.
5. **Improper Wheel Dressing**: Any bumps or imperfections on the wheel surface can leave visible marks on the workpiece.
To prevent such issues, regular maintenance of the grinding wheel, proper lubrication control, and consistent machine calibration are essential. Ensuring that the grinding wheel is properly dressed and free from contaminants can significantly improve the quality of the finished product.
**Related Bearing Knowledge:**
- Protection, Overhaul, and Abnormal Handling of Pressure-Hydraulic Static Guide Bearings
- Use of NSK Bearings in Machine-Paired Bearings
- Features of SKF Imported Bearings
- Hardness and Relative Wear Rate of SKF Bearing Grinding Oxide
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