The application of wear-resistant materials in the production of ore dressing equipment and sand making equipment
Release time:
2021-08-04
Abrasion-resistant materials are widely used in mining machinery such as ore dressing and sand-making equipment. The abrasive environment refers to the object being abraded, the contact method between the abrasion-resistant material and the abrasive, the relative motion state, the interaction relationship, the common cavity and its temperature and humidity. In China, the sand-making equipment and ore dressing equipment in the mining equipment industry are products with severe corrosion during production, especially the sand-making machine, sand washing machine, vibrating screen, rod mill, jaw crusher, etc., in the sand-making equipment. During production, they are in long-term friction contact with stones or other materials, and are easily abraded. Therefore, the quality of ore dressing equipment and sand-making equipment produced by domestic companies is closely related to the corrosion resistance of the product.
Material wear mechanisms: According to the mechanism, material wear can be divided into abrasive wear, impact wear, sliding wear, contact fatigue wear, fretting wear, erosion wear, adhesive wear, and abrasive wear. Among them, abrasive wear accounts for more than 50% of all wear losses. In the cement industry, abrasive wear is mostly the main wear mode.
Abrasive wear—abrasive wear refers to the process of material surface loss caused by the interaction between abrasive particles or hard asperities and the surface material. For example, the wear caused by the mutual movement and friction between equipment components and ore, sand, soil, clinker, coal, etc.
Abrasive wear is divided into cutting abrasive wear, high-stress abrasive wear, and low-stress abrasive wear according to the stress and impact on the material surface. 1) Cutting abrasive wear. The characteristic of this type of wear is that the impact force is large, and the abrasive cuts into the metal surface with a large impact, chiseling off large particles of metal from the friction surface, producing deeper grooves and indentations on the worn surface. For example, the wear on the surface of parts such as ore crusher hammers. 2) High-stress abrasive wear. The characteristic of this type of wear is that the stress is high, and the stress on the abrasive exceeds the crushing strength of the abrasive. The crushed abrasive particles are polygonal, scratching the metal, leaving grooves and pits on the friction surface. For example, the damage to the surface of the jaw plate of an ore crusher. 3) Low-stress abrasive wear. The characteristic of this type of wear is that the stress is low, and the stress of the abrasive acting on the friction surface does not exceed its own crushing strength. The material surface has scratches and small cutting marks. For example, the wear of the impeller of a mud pump.
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