High Pressure Water Cutting

The so-called "water jet" uses a high-pressure pump to pressurize the sealed water, and sprays it through a very fine nozzle made of high-grade carbide, sapphire, diamond, etc., to cut the material.

To do this, there is a high demand for water, pipes, and spouts. Such as pipes, water jets use high-pressure tools to pressurize water and shoot out. It must have extremely high pressure to cut hard cutting materials, so pipes must be able to withstand extremely high pressure, which is far greater than 700 trillion Pa, because the thin steel plate (the material to be cut) itself can withstand a pressure of 700 MPa.

Secondly, it is not right that the water used for the water jet is completely free of impurities. Because the water pressure is much greater than 700 MPa, for sealing equipment such as pipes, no matter how good the sealing performance is, pure water will always cause them to wear and leak. In order to solve this problem, 5% soluble emulsified oil should be added to the water jet water to improve the sealing effect. For high-pressure pumps, some oil should also be added to improve its sealing performance.

The nozzle of the water jet is made of cemented carbide, sapphire and other materials, the diameter of the nozzle is only 0.05 mm, and the inner wall of the hole is smooth and flat, and can withstand the pressure of 1700 MPa, so the high-pressure water sprayed can be like a knife cut material. Some water also adds some long-chain polymers, such as polyethylene oxide, to increase the "viscosity" of the water, making the water spray like a "thin line".