150 mm steel plate, hammer, titanium, bullets, axes, bulletproof glass, as if any object in front of it, even the world's hardest diamond is so fragile that it can be easily cut. Moreover, the substance cut with a water knife will also maintain its original characteristics.
What kind of knife is this? Why is a knife made of water so powerful? Lao Bai first takes everyone to review the history of waterjets.
In 1936, experts from the United States and the former Soviet Union tried to pressurize the water, which created a high-pressure water jet, which they used for mining operations in the mining area.
In 1950, the father of ultra-high pressure, Franz first flushed water out of a very small nozzle, and the moment the water rushed out, it formed a high-pressure jet, and the high-pressure water at this time could be used to cut some wood.
In 1979, Dr. Mohammed Hashesh began to study how to use a waterjet to cut metal materials, he added garnet to ordinary waterjet, you may not be familiar with garnet, in fact, it is a material commonly used on our sandpaper. Sanded waterjets that can cut almost any material.
In 1980, sandjet waterjets were used for the first time in cutting metal, glass and concrete.
In 1983, the world's first official commercialized waterjet cutting system was born. The earliest industry used was aerospace, and since then, more and more industries have begun to use sand-filled waterjets.
After 2000, waterjets 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, five-axis waterjets have begun to appear.
At present, sanding waterjets are widely used in stone, construction, shipyards, tiles, glass and other industries.
The working principle of the waterjet is actually very simple, that is, to increase the pressure of the water flow to more than 200 megapascals, and to rush out in a very small nozzle to form a high-pressure waterjet. When cutting, the heat generated by the waterjet is carried away by the high-speed flowing water jet, and it is important that no new harmful substances are produced when cutting.
What are the types of waterjets? At present, waterjets can be divided into low-pressure waterjets, high-pressure waterjets, and ultra-high pressure waterjets. The difference here is mainly determined by the water pressure, the water is pressurized to more than 30 megapascals of waterjet is a low-pressure waterjet, can cut some simple materials, when the pressure reaches 100 megapascals, it is a high-pressure waterjet, this time the waterjet can complete most of the cutting work, when the pressure continues to increase, after reaching more than 200 megapascals, it is an ultra-high pressure waterjet.
Currently, the highest waterjet pressure in the world can reach 600 megapascals. The water pressure of the waterjet we currently use in China is about 200 to 400 MPa. Well, this issue is here, pay attention to the old man, we will see you in the next issue.