Material of nozzle for ultra-high pressure water jet

It is wrong that the water used for the ultra-high pressure water jet is completely free of impurities

To achieve this, there is a relatively high demand for water, pipelines and nozzles.For example, pipelines, ultra-high pressure water knife is a high-pressure tool to inject water after pressure, must have a very high pressure to cut the hard cutting material, so the pipeline must be able to withstand extremely high pressure, this pressure is far greater than 700 MPa, because the thin steel plate (cut material) itself can withstand 700 MPa pressure.

Secondly, it is wrong that the water used for the ultra-high pressure water knife is completely free of impurities.Because the water pressure is far greater than 700 MPa, no matter how good the sealing performance is for sealing equipment such as pipelines, pure water will always wear them out and leak.To solve this problem, 5% soluble emulsified oil should be added to the water used for ultra-high pressure water knife to improve the sealing effect.For high-pressure pumps, some oil should also be added to improve their sealing performance.

As mentioned above, the nozzle of the ultra-high pressure water knife is made of cemented carbide, sapphire and other materials. The diameter of the nozzle is only 0.05 millimeters, and the inner wall of the hole is smooth and flat. It can withstand the pressure of 1700 MPa, so the high pressure water ejected can cut the material like a knife.Some water also adds long-chain polymers, such as polyethylene militaries, which increase the water's "viscosity" and make the ejected water look like a "thin line".

Its processing accuracy is high, and its cutting width is only 0.1-0.8 mm. It can process parts with complex profiles.The machined parts cut smoothly and neatly, without need of trimming.Especially for the processing of easy-to-heat profile-finding materials, "ultra-high pressure water knife" has more unique advantages.

"Ultra-high pressure water knife", just because it is not a knife, it does not have wear problems like the knife, the abrasives and wastewater incorporated in the water jet can be recycled, the equipment is relatively simple, and the processing cost is low.The vibration and noise caused by the processing process are very small, the amount of chips is only 15%-20% of the mechanical processing, and the shoulder crushing goes along with the water, and will not hurt the operator by flying, so it opens up a broad field of use.Cutting composite materials is a difficult problem in processing.If the traditional processing method is used, there will be delamination and tearing, and the "ultra-high pressure water knife" is the ideal tool to solve this problem.The effect of using "ultra-high pressure water knife to remove ceramic coating of components is better than that of mechanical and chemical methods."Ultra-high pressure water knife" can be used for punching and crushing materials.Attachments on the hull and propeller surfaces, fouling in chemical pipelines, and cleaning with an "ultra-high pressure water knife" are also convenient.

Ultra-high pressure water knife can also be used in surgery.(Tests with a 0.7 MPa "ultra-high pressure water knife" at the Tokyo University School of Medicine on home immunity show that it can be used in the operation of liver, kidney and other organs without damaging surrounding tissues, and is not susceptible to infection.