Waterjet because of the need to use a powerful pressure, so water jet diameter is very small, so as to produce strong pressure. Water jet is through ultra high pressure generator pressure water to 300MPa or more, spray through a fine nozzle made of advanced carbide, sapphire, diamond or others, its speed is several times of the sound speed, this high pressure water flow with a strong cutting ability, but also by adding sand and other abrasives which can make the cutting ability of several fold enhancement.
High-pressure water jet can cut almost all materials quickly: glass, rubber, fibers, fabrics, steel, stone, plastic, titanium, chromium and other nonferrous metals, composite materials, stainless steel, reinforced concrete, colloids, soil. So to speak, in addition to the diamond and tempered glass (friable), there is no material that the high-pressure water jet cutting machine can not cut. And it can be safely cutting inflammable and explosive materials, as applied to the abandoned shells, bombs dismantled cutting.
Waterjet cutting small kerf (about 1-2MM), high cutting accuracy (0.0002mm), can be free to cut a variety of complex graphics, waterjet cutting incision smooth, no burrs, no heat no annealing phenomenon, cutting surface flat, widely used in aircraft parts, precision mechanical gear, printers, Walkman gear, parts and so on.
Waterjet has relatively high requirement for water, pipes, nozzle. Such as pipes, water jet is the use of high pressure tool after the water pressure and spray out, must have a very high pressure to cut the hard cutting materials, so the pipe must be able to withstand extremely high pressure, the pressure is much greater than 700 MPa, because thin steel plate (the material being cut) itself can withstand the pressure of 700MPa. Secondly, waterjet used water completely free of impurities is wrong. Because the pressure is much greater than 700MPa, for the pipeline and other sealing devices, no matter how good the sealing performance, pure water will always make them wear and leakage. To solve this problem, the water jet used water should add 5% soluble emulsified oil, improve the sealing effect. For the high-pressure pump, but also add some oil to improve the sealing performance.
Source: http://www.waterjetnozzles.com High Pressure Waterjet Sealing Parts.
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