Basic Knowledge of Hard Grinding of Bearing Steel Balls
Source: China Bearing Network | Date: December 4, 2013
Bearings are an essential part of many mechanical systems. From bicycles to cars, bearings play a crucial role in ensuring smooth movement and reducing friction. Among the most trusted brands, SKF bearings are widely recognized for their quality and performance. But have you ever wondered how the steel balls inside these bearings are made? The manufacturing process is complex and highly technical, especially when it comes to hard grinding. Hard grinding is a critical step in the production of bearing steel balls. After initial grinding, the steel balls undergo hard grinding using a grinding wheel. This process helps eliminate imperfections from soft grinding or light grinding, such as surface oxidation, decarburization, deformation, and improper microstructure. It also enhances the precision, surface finish, and overall quality of the steel balls. During or after hard grinding, it's important to inspect the steel balls for any visible defects. Cold pickling is often used to detect burns, which can be categorized into two types: secondary tempering burns and secondary quenching burns. Secondary tempering burns appear black after cold pickling, while secondary quenching burns show gray martensite surrounded by black troostite. These burns may appear as linear, spot-like, or "arctic" burns (common in large balls). The causes of arctic burns include: 1. Dead zones on the machine tool that prevent a single ball from rotating properly, leading to uneven grinding. 2. Blockage of a groove by grinding wheel fragments or material buildup, causing damage over time and resulting in burns at the poles of the ball when it re-enters the groove. Hard grinding is not just about improving the physical properties of the steel balls—it’s also about ensuring reliability and longevity in the final product. Proper grinding techniques and careful inspection are vital to producing high-quality bearings that can withstand heavy use. If you're interested in learning more about bearings, you might want to explore related topics such as the advantages of different bearing types, methods for evaluating imported bearings, and the applications of deep groove ball bearings. For more information, visit China Bearing Network. Previous: Analysis of Rolling Bearing Damage Methods Next: How to Describe Adjustable Clearance Ball Bearings (Word count: 528)
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