What is the development history of cemented carbide waterjet?

2020-06-03

What is the cemented carbide waterjet The nozzle of the waterjet 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, can withstand the pressure of 1700 MPa, so the high pressure water jet Cut the material like a knife. Some water is also added with some long-chain polymers, such as polyethylene oxide, which increases the viscosity of the water" and makes the sprayed water look like a "thin line"

Ordinary water passes through an ultra-high pressure pressurizer, pressurizes the water to 4,000 bar 60,000 psi, and then passes through a small nozzle with a diameter of 0.004 inches to 0.016 inches to produce a water arrow that triples the speed of sound at 915 meters per second. This water arrow can be used for various surface treatment and cutting various non-metallic materials such as paper, diapers, glass, fiber, sponge, etc. To achieve this, there is a relatively high demand for water, pipes and spouts. Such as pipelines, water jets use high-pressure tools to pressurize the water and shoot it out. It must have extremely high pressure to cut hard cutting materials, so the pipeline must be able to withstand extremely high pressures, which are far greater than 700 trillion Pa, because the thin steel plate (the material being cut) can withstand a pressure of 700 MPa. The processing precision is high, the cutting width is only 0.10.8 mm, and the parts with complex shapes can be processed. The cut of the processed parts is smooth and tidy, and no trimming is required. Especially for the processing of materials that are easily deformed by heat, the "waterjet" has a unique advantage. Unlike the cutter, there is no wear problem. The abrasive and wastewater mixed into the water jet can be recycled and used. The equipment is relatively simple and the processing interest is low. Processing The vibration and noise caused by the process are very small, the amount of chips is only 15% and 20% of the machining, and the debris flows with the water, and will not fly and hurt the operator. Pure water jet is an early water cutting method. A commercial The application began in the mid-1970s and was used to cut corrugated cardboard. The big application of pure waterjet is to cut disposable diapers, cotton paper and automotive interior parts. For cotton paper and disposable diapers, it is in line with other technologies Than, waterjet technology leaves less moisture on the material.

Since ancient times, humans have used the impact of water flow to make waterwheels, watermills and other hydraulic machinery. If the water flow is ejected from the high-pressure water gun, the impact force is greater. The former Soviet Union was used in the coal mining industry, known as hydraulic coal mining. The water flow spouted at high speed is blocked by the coal seam, the speed drops suddenly, and a sufficient impact force will be generated in a moment to cause brittle fracture of the coal seam and complete the coal mining operation. Inspired by this, scientists from the former Soviet Union developed high-pressure water jet cutting technology, and the American company obtained the patent of this technology to commercialize it. Normal water passes through an ultra-high pressure pressurizer, pressurizing the water to 4,000 bar (60,000 psi), and then passing through a fine nozzle (having a diameter of 0.004 inches to 0.016 inches), can produce a channel of up to 915 meters per second (about Water arrows, three times the speed of sound), this water arrow can be used for various surface treatments and cutting various non-metallic materials such as paper, diapers, glass, fiber, sponge, etc. For cutting metal and hard materials such as various stones, glass, ceramics, ceramic tiles, etc., Flow also developed a patented and more complete design, which is to mix sand and water arrows to enhance its cutting ability. This kind of high-speed sanding waterjet can cut almost any material. It does not have the problem of abrasion like a tool. The abrasive and waste water mixed into the water jet can be recycled and used. The equipment is relatively simple and the processing cost is low. The vibration and noise caused by the machining process are very small, the amount of chips is only 15%-20% of the mechanical processing, and the debris flows with the water, and will not fly and hurt the operator.

"Waterjet" opened up a vast field of use just because it is not a sword. Cutting of composite materials is a thorny issue in processing. If the traditional processing method is adopted, there will be delamination and tearing, and the "waterjet" is the ideal tool to solve this problem. Using "waterjet" to remove the ceramic coating of the parts is better than mechanical and chemical methods. "Waterjet" can be used for punching and crushing materials. The attachments on the hull and the surface of the propeller, and the fouling in the chemical pipes are also very convenient to clean with a "waterjet". Secondly, it is wrong that the water used for waterjet 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 make them wear and leak. In order to solve this problem, waterjet water should be added with 5% soluble emulsified oil to improve the sealing effect. For the high-pressure pump, some oil should also be added to improve its sealing performance. As mentioned above, the nozzle of the waterjet is made of 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. Cut the material like a knife. Some water also incorporates some long-chain polymers, such as polyethylene oxide, to increase the "viscosity" of the water and make the sprayed water look like a "thin line." It has high processing accuracy, the cutting width is only 0.1-0.8 mm, and it can process parts with complex shapes. The cut of the processed parts is smooth and tidy, and no trimming is required. Especially for the processing of materials that are easily deformed by heat, the "waterjet" has unique advantages.

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