Abrasive has a significant effect on the performance of high-pressure water jets, especially in the abrasive water jet cutting, the choice of abrasive directly affects the cutting speed and the cutting surface quality. Many types of abrasives theoretically. According to sources can be divided into natural abrasive and artificial abrasive. Natural abrasive is made by minerals in nature crushing and screening, it is usually easier to impurities, but the cost is cheap; the second is artificial abrasive smelting by chemical methods, high purity, good performance, but the manufacturing process is complicated and expensive.
Garnet's chemical name: aluminum (calcium) silicate, to zhongtiao mountains garnet ore as raw materials, with the modern craft sticks refined, products high self-sharpening, grinding efficiency, sand consumption is low, wear parts good finish. The abrasive shell-shaped fracture, moderate hardness, good toughness, sharp corners, can be in continuous grinding new edges and side edges formed in the classification, make it better than other abrasive grinding, which has high hardness, specific gravity, chemical properties stable and unique self-sharpening of advantages, later also widely used in water jet cutting, therefore, also known as water jet sand. Natural almandine garnet because of its unique physical characteristics, high hardness, moderate cutting ability, no free silicon to become the best and most economical high-pressure water jet cutting medium.
According to the research, it is indicated that the water jet cutting any material has an optimum abrasive particle size, that is the same jet pressure and flow, can get the maximum cutting depth at a certain size, and increase or decrease the size, cutting depth are reduced accordingly. And for different hardness of the abrasive, for cutting different materials, the effect of different. For brittle materials, plastic materials and soft materials, the requirements of the abrasive are also different. For the same kind of abrasive, the same kind of cutting material, different water pressure and sand flow, the effect of cutting is also very great. Cutting process, water pressure and sand flow also has an optimal state.
Currently, the water jet grade garnet sand mainly 60 mesh, 80 mesh and 120 mesh, the basic is natural gravel screening process. The main origin of India, China, the United States, Australia and other regions, the domestic mainly concentrated in Hebei Xingtai and Lianyungang East China Sea area. In the price, the higher price of imported garnet sand, and lower price of domestic sand, quality is also very good.
Source: http://www.waterjetnozzles.com Abrasive Waterjet Nozzles.
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