Analysis of Wear Marks on Bearings in Fine Grinding
Source: Bearing Network | Date: August 11, 2013
In fine grinding processes, bearings often show visible wear marks on the surface of the workpiece. These marks are typically caused by the high level of precision required during the operation. One common type of mark is the interpenetrating spiral pattern, which can be easily observed with the naked eye. The formation of these spiral patterns is primarily due to poor flatness of the grinding wheel. If the wheel has a concave or convex surface, it may only make slight contact with the workpiece during each pass. As the workpiece or grinding wheel moves back and forth multiple times, the spiral pattern is repeated and becomes visible. The pitch of these spirals depends on the speed of the worktable and the rotation speed of the workpiece, as well as the alignment between the grinding wheel axis and the worktable rail. There are several main causes behind the formation of these spiral marks: 1. **Poor Trimming of the Grinding Wheel**: If the wheel is not properly trimmed or chamfered, it can lead to uneven contact with the workpiece. 2. **Excessive Lubrication on the Workbench Guide**: Too much oil can cause the workbench to float, leading to instability during grinding. 3. **Low Machine Tool Accuracy**: Inaccurate machine tools can result in improper alignment and uneven pressure distribution. 4. **Excessive Grinding Pressure**: High pressure can cause localized wear and irregular patterns on the workpiece surface. Other contributing factors include: 1. **Insufficient Rigidity in V-shaped Guide Rails**: This can cause the grinding wheel to shift during operation, resulting in edge contact rather than even surface contact. 2. **Unstable Workbench Speed During Repair**: An unstable or imprecise movement of the workbench can lead to inconsistent grinding results. 3. **Poor Rigidity of the Workpiece**: A flexible or unstable workpiece may vibrate or shift, causing irregular wear patterns. 4. **Contamination on the Grinding Wheel**: Accumulated debris, such as broken abrasive particles or metal shavings, can affect the grinding process. It’s important to clean the grinding wheel regularly with cooling water. 5. **Improper Wheel Trimming**: Any bumps or irregularities on the wheel surface can leave visible marks on the workpiece. To prevent such issues, regular maintenance and precise adjustment of the grinding wheel and machine tool are essential. Additionally, proper lubrication control and cleaning procedures should be followed to ensure consistent and high-quality grinding results.
Related Bearing Knowledge: - Protection, Overhaul, and Abnormal Handling of Pressure-Hydraulic Static Guide Bearings - Use of NSK Bearings in Machine-Paired Bearings - SKF Imported Bearing Data and Functional Requirements - Hardness and Relative Wear Rate of SKF Bearing Grinding Oxide This article is linked from http:// Please cite China Bearing Network at http:// Previous: Analysis of Rolling Bearing Accuracy Next: Introduction to Self-Lubricating Rod End Joint Bearings
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