Progressive ball bearing vibration and noise reduction skills and process equipment

**Progressive Ball Bearing Vibration and Noise Reduction Techniques and Process Equipment** Home > Bearing Knowledge > Progressive Ball Bearing Vibration and Noise Reduction Skills and Process Equipment Source: Bearing Network | Time: February 3, 2014 --- At present, the internal groove layout parameters of deep groove sealed ball bearings in China are largely similar to those of leading foreign manufacturers. However, the oscillation and noise levels of Chinese bearings still lag behind their international counterparts. One of the main reasons for this discrepancy lies in the production and working conditions during manufacturing. From a professional perspective, working conditions can impose certain demands on the host equipment. However, reducing vibration and noise caused by production factors remains a significant challenge in the bearing industry. Many national experiments have shown that the processing quality of the cage, inner ring, and steel balls has different impacts on bearing oscillation. Among these, the quality of the steel balls has the most significant influence, followed by the inner ring. The most critical factors affecting oscillation include the roundness, waviness, surface roughness, and appearance of both the steel balls and the rings. In China, one of the most prominent issues with steel ball products is the high variability in oscillation values and the presence of severe surface defects such as single points, clusters, or pits. Although the surface roughness, scale, shape, and dimensional accuracy may meet or exceed industry standards, the final bearing may still exhibit high oscillation or abnormal noises. This is primarily due to uncontrolled waviness (lack of specifications and suitable analytical instruments), poor machine tool vibration resistance, and challenges in grinding wheel performance, coolant use, and process parameters. Additionally, improving management practices is essential to prevent accidental quality issues like dents, scratches, and burns. Regarding the inner ring, the most significant impact on bearing oscillation comes from the waviness and surface roughness of the raceway. For example, if the circularity of the raceway in small and medium-sized deep groove ball bearings exceeds 2μm, it can significantly affect the oscillation. When the raceway waviness exceeds 0.7μm, the oscillation value increases proportionally. Severe damage to the raceway can raise the oscillation by more than 4dB. Whether it's the steel ball or the inner ring, waviness occurring during the grinding process can negatively affect the final product. Although ultra-finishing can improve waviness and reduce surface roughness, the most effective method is to minimize waviness during the initial grinding stage. Preventing random surface defects requires two main approaches: The first approach involves reducing oscillation during the super-fine grinding process. To achieve excellent surface shape accuracy and texture, the grinding machine must have superior vibration resistance. Key components like the bed should incorporate vibration-damping features. The oil stone oscillating system in ultra-precision machines should also have strong anti-vibration capabilities and improved grinding speed. For instance, foreign manufacturers often use electric spindles operating at over 60 m/s, while domestic systems typically operate at much lower speeds due to limitations in main bearing functions. The second approach focuses on improving the precision of the machining reference surface. Errors in the outer diameter and end face during the super-precision grinding process serve as the positioning reference for subsequent operations. Any error in the outer diameter-to-raceway mapping will directly affect the groove grinding. If the workpiece is bumped during transfer, it can be reflected on the raceway surface, thereby impacting the bearing's oscillation. To address this, it is necessary to enhance the shape accuracy of the reference surfaces, ensure smooth handling during processing, avoid any bumps, and limit the blank position error. Especially when the retention is small, excessive errors can compromise the final shape accuracy, which is critical for meeting quality requirements. --- **Related Bearing Knowledge:** - 5 Steps to Recognize the Selection Criteria for Imported Bearings and Distinguish Genuine from Counterfeit Rolling Bearings - "Protection Strategy" for Industrial INA Self-Aligning Ball Bearings - MM/MMV (Machine Tool Bearings) - Common Problems in Rolling Bearings --- This article was originally published on [China Bearing Network](http://www.chinabearing.net). Please cite the source when reusing the content. Previous: Application of Coating in Shaft Machining Next: The "Quality Misunderstanding" of Bearings

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