What is the principle of water jet?
150mm steel plate, iron hammer, titanium metal, bullet, axe, bulletproof glass, as if any object is in front of it, even the hardest diamond in the world is so fragile that it can be easily cut. Moreover, the material cut with a water knife will keep its original characteristics unchanged.
What kind of knife is this? Why are knives made of water so powerful? Lao Bai will take you to review the history of water jets first.
In 1936, experts in the United States and the former Soviet Union tried to pressurize water, thus forming high-pressure water jets, and they used high-pressure water for mining operations in mining areas.
In 1950, Franz, the father of ultra-high pressure, flushed water out of a very small nozzle for the first time. The moment the water was flushed, a high-pressure jet was formed, and the high-pressure water at this time could be used to cut some wood.
In 1979, Dr. Mohammad Hashish began to study how to cut metal materials with water jets. He added garnets to ordinary water jets. You may not be familiar with garnets. In fact, it is a commonly used material on our sandpaper. A sanded water jet capable of cutting almost any material.
In 1980, the abrasive waterjet was used for the first time in cutting metal, glass and concrete.
In 1983, the world's first commercial abrasive waterjet cutting system was born. The first industry used was aerospace, and since then, more and more industries have begun to use abrasive water jets.
After 2000, the water jet has developed rapidly, and the entire cutting and processing industry has almost been changed by it. And the trend of intelligence is becoming more and more obvious, three-axis, four-axis, and five-axis water jets have all begun to appear.
At present, sanding water jets are widely used in stone, construction, shipyard, ceramic tile, glass and other industries.
The working principle of the water jet is actually very simple. It is to increase the pressure of the water flow to more than 200 MPa and rush it out in a very small nozzle to form a high-pressure water jet. When cutting, the heat generated by the water jet is carried away by the high-speed water jet, and importantly, no new harmful substances are generated when cutting.
What are the types of water jets? At present, water jets can be divided into low pressure water jets, high pressure water jets, and ultra-high pressure water jets. The difference here is mainly determined by the water pressure. The water jet when the water is pressurized to more than 30 MPa is a low-pressure water jet, which can cut some simple materials. When the pressure reaches 100 MPa, it is a high-pressure water jet. This When the water jet can complete most of the cutting work, when the pressure continues to increase to more than 200 MPa, it is the ultra-high pressure water jet.