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The reason why the bearing forms a spiral defect in the grinding process
**The Reason Behind Spiral Defects in Bearings During the Grinding Process**
Home > Bearing Knowledge > The Reason for the Shortcomings of the Bearing in the Grinding Process
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**Why Do Bearings Develop Spiral Defects During Grinding?**
During the grinding process, bearings are subjected to high-speed rotation of a grinding wheel, which shapes and refines their surfaces. If the grinding is not performed according to the proper procedures and guidelines, various defects can occur, affecting the overall quality and performance of the bearing.
One common issue is the formation of spiral marks on the surface of the bearing. These spiral patterns are often visible to the naked eye and are caused by several factors. A primary cause is the poor flatness of the grinding wheel's surface, leading to uneven contact with the workpiece. When the grinding wheel has irregularities—such as concave or convex areas—it only touches the workpiece at certain points during each pass. Repeated movements of the workpiece or grinding wheel result in these visible spiral patterns.
The pitch of the 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 guide rails. If they are not parallel, this misalignment can also contribute to the formation of spiral defects.
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**Common Causes of Spiral Marks:**
1. **Poor Grinding Wheel Dressing:** The grinding wheel may not be properly dressed, leading to sharp edges that create uneven cuts.
2. **Excessive Lubricating Oil on the Workbench Guide:** This can cause the workbench to float, resulting in unstable grinding.
3. **Low Machine Tool Accuracy:** Inaccurate machine setup can lead to inconsistent grinding results.
4. **Excessive Grinding Pressure:** Too much pressure can cause the grinding wheel to dig into the material, creating unwanted marks.
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**Other Contributing Factors:**
1. **Poor Rigidity of the V-Shape Guide Rail:** This can cause the grinding wheel to shift during operation, leading to uneven contact.
2. **Unstable Workbench Speed During Repairs:** An unstable speed can affect the consistency of the grinding process.
3. **Low Rigidity of the Workpiece:** A weak or flexible workpiece can vibrate or deform during grinding, causing irregularities.
4. **Contamination on the Grinding Wheel:** Residual debris or metal shavings from the workpiece can stick to the grinding wheel, affecting its cutting ability.
5. **Improper Dressing of the Grinding Wheel:** Uneven dressing can create bulges or uneven surfaces, leading to defects in the finished product.
The main reason for fish-scale-like patterns is when the cutting edge of the grinding wheel becomes dull, leading to a "squatting" effect during grinding. This causes the surface to appear uneven and textured.
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- Substantial noise in FAG bearings (Part 1).
- Detailed discussion on the disassembly methods of various types of bearings.
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This article was originally published on China Bearing Network.
Please refer to http://www.chinabearing.net for more information.
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