Bearing in Grinding (Part 1) Home > Bearing Knowledge > Bearing in Grinding (1) **Source: China Bearing Network | Date: June 26, 2014** Grinding is a critical process in bearing manufacturing, where the workpiece surface is polished using a high-speed rotating grinding wheel. If not operated and adjusted properly according to the instructions, various issues may arise during the grinding process, which can affect the overall quality of the bearing. During fine grinding, the surface of the workpiece often shows visible grinding marks due to the high precision required. One common issue observed is the formation of spiral patterns on the surface. These spirals occur when the grinding wheel and workpiece make only slight contact, and after several reciprocating motions, the pattern is repeated and becomes visible to the naked eye. 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. **Main Causes of Spiral Marks:** 1. Poorly dressed grinding wheel with unchamfered edges or insufficient coolant. 2. Excessive lubricating oil on the workbench guide rails, causing it to float. 3. Inaccurate machine tool setup. 4. Excessive grinding pressure. **Additional Causes of Spiral Patterns:** 1. Poor rigidity in the V-shaped guide rail, leading to misalignment of the grinding wheel. 2. Unstable worktable speed during dressing, low precision, or improper wheel dressing. 3. Poor rigidity of the workpiece itself. 4. Broken abrasive grains or metal shavings stuck on the grinding wheel surface, requiring cleaning with cooling water. 5. Improper wheel dressing resulting in uneven surfaces. Another common issue is the appearance of fish-scale-like patterns on the workpiece surface. This typically occurs when the cutting edges of the grinding wheel are dull, leading to a "squatting" effect and increased vibration during grinding. **Reasons for Fish-Scale Appearance:** 1. Contaminants such as debris or oil on the grinding wheel surface. 2. The wheel is not properly dressed. 3. Dull grinding wheel with poor sharpening. 4. Weak diamond mounting frame or low-quality diamond. 5. Uneven hardness across the grinding wheel. The roughness or fluffiness on the workpiece surface is often caused by coarse abrasive grains that remain behind after grinding. These particles can become embedded between the workpiece and the grinding wheel. **Causes of Rough Surface After Grinding:** 1. Residual marks from rough grinding that weren’t fully removed during fine grinding. 2. Coarse and fine abrasive particles in the coolant not being cleaned thoroughly. 3. Abrasive grains falling off after the coarse grinding stage. 4. Incorrect tolerance settings or an overly soft grinding wheel. 5. Incompatible abrasiveness and workpiece material properties. **Related Bearing Knowledge:** - Thrust Ball Bearing Analysis and Features - SKF Single Row Tapered Roller Bearing Minimum Load - IKO Needle Bearing Corrosion Issues - LM48548/10 Tapered Roller Bearing - Basic Production Process of Rolling Bearings This article was originally published on China Bearing Network. For more information, visit [http://...]. Previous: Classification of Imported Bearings Next: How to Correct Equipment and Protect Reverse Support *Note: This content has been rewritten and expanded to ensure originality and readability, while maintaining the technical details from the original text.*

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