Basic Knowledge of Hard Grinding of Bearing Steel Balls

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Bearings are an essential part of many mechanical systems, from bicycles to cars. You might have seen them, but do you know how the steel balls inside a high-quality bearing like SKF are made? The manufacturing process of a bearing is complex and highly technical, especially when it comes to producing the steel balls that ensure smooth operation and long life. One crucial step in this process is hard grinding. This technique involves using a grinding wheel to refine the surface of the steel ball after initial shaping. The purpose of hard grinding is to eliminate imperfections left from softer grinding methods, remove oxidation layers formed during heat treatment, and correct issues like decarburization, deformation, and improper microstructure. It also helps improve the precision, surface finish, and overall quality of the steel ball. During or after the hard grinding process, the appearance of the steel ball should be carefully inspected for any defects. After cold pickling, signs of burning can be identified. These burns typically fall into two categories: secondary tempering burns and secondary quenching burns. Secondary tempering burns appear black after pickling, while secondary quenching burns show as gray martensite surrounded by black troostite. Burns can manifest in different forms, such as linear burns, spot burns, or even large-scale "arctic burns" in the poles of the ball. The causes of arctic burns are often related to machine tool design or maintenance. For example, certain dead zones in the grinding equipment may cause a single ball to rotate in place without proper contact with the grinding wheel, leading to localized overheating. Another common issue is when a groove becomes blocked by debris or material buildup, which can prevent the ball from moving correctly and result in burning at the poles. Understanding these processes and potential issues is vital for ensuring the reliability and performance of bearings used in critical applications. Whether in industrial machinery, automotive systems, or consumer products, the quality of the steel ball directly impacts the efficiency and lifespan of the bearing. If you're interested in learning more about bearing technology, we recommend exploring related topics such as the advantages of bearing materials, quality inspection methods for imported bearings, and the use of deep groove ball bearings in various applications. This article is sourced from China Bearing Network. Please visit their website for more information. Previous: Analysis of Rolling Bearing Damage Methods Next: How to Describe Adjustable Clearance Rolling Ball Bearings

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