Corundum, with aluminum oxide as its main chemical component, is a fundamental raw material in the manufacturing of grinding wheels. It exists in both natural and artificial forms. Natural corundum, renowned for its high hardness (Mohs hardness 9) and remarkable wear resistance, is often processed into abrasives. However, in industrial applications, artificial corundum, including brown corundum, white corundum, and chrome corundum, is more prevalently used. Each type of artificial corundum has distinct properties, catering to diverse grinding requirements. For instance, brown corundum, characterized by high toughness and a reasonable price, is ideal for the rough grinding of common steel materials. In contrast, white corundum, with its high purity and greater hardness, is well-suited for the precision grinding of materials such as stainless steel.
Corundum plays a pivotal role in determining the performance of grinding wheels. Its extreme hardness enables it to effortlessly grind hard materials, such as metals and stones. The wear resistance of corundum significantly extends the service life of grinding wheels, reducing the frequency of replacements. Moreover, corundum exhibits excellent heat resistance. During high-speed grinding operations where substantial heat is generated, it remains stable without deteriorating, ensuring a consistent and reliable grinding process. This property is crucial as it prevents overheating of the workpiece, which could otherwise compromise its quality.
The manufacturing process of grinding wheels using corundum is a meticulous one. Firstly, in the batching stage, corundum abrasives are carefully mixed with binders, such as resin or ceramics, in specific proportions. The choice of binder depends on the intended application of the grinding wheel. Subsequently, the mixing process involves mechanical agitation to ensure a homogeneous blend of the abrasives and the binder. Next comes the forming step, where the mixed material is poured into molds and subjected to pressure to shape the grinding wheel blanks. After that, the blanks are cured in a furnace at a precisely controlled temperature. This curing process allows the binder to bond the corundum particles together effectively. Finally, the grinding wheels undergo trimming and inspection. Burrs are removed, and key parameters such as size and hardness are thoroughly tested. Only those grinding wheels that meet the required standards are approved for release.
In conclusion, corundum is the cornerstone of high-performance grinding wheels. Its unique properties and the precise manufacturing process using it are essential for meeting the diverse and demanding needs of modern grinding applications.