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How Is The Magnet Made?

Nov. 24, 2019

Magnets are very common in our lives, and we can find them in mobile phones, headphones, refrigerators, and microwave ovens. In the beginning, it was thought that magnets could only be obtained from nature until two hundred years ago, scientists mastered the method of generating magnets by applying electricity to the alloy. Today, let the Segment Neodymium Magnet Manufacturer introduce us to the method of making the magnet!


Artificially made magnets must first start with a mold. There are four U-shaped magnet-shaped projections on the tray, then the tray is placed in the machine and filled with sand. Once filled, remove the tray and smooth the surface. Then, enter the machine again, at this time the machine will use the pump to inject chemicals into the sand to make the sand together and make it strong and durable. In addition to the conventional U-shaped magnet mold, there are other shapes of molds such as ring magnets.


Precast Concrete Magnet


Precast Concrete Magnet


After the mold is completed, the magnet ingredients can be melted and mixed. Ingredients include copper, cobalt, sulfur, nickel, iron, aluminum and titanium. Put all of these ingredients in an induction furnace. An AC-powered induction furnace produces a pulsating electromagnetic field that heats the metal to 1,650 degrees Celsius and melts all metals.

Next, the metal in a molten state is poured into the mold. The high temperature will burn some of the material in the sand mold. At this time, the worker will push down the metal-injected mold and smash it with a hammer, so that the material in the sand mold is completely burned. Subsequently, all the pieces are shoveled into the tray and the alloy material is picked up using off-the-shelf magnets, at which time the cast magnets are not magnetic. A magnet designed for the motor is attached to a rod and placed in a copper tube. Fill the inside of the copper tube with silica powder to ensure a fixed position.


Finally use a cement seal. The copper tube is then placed in an induction cooker for heating. The high temperature allows the unformed magnet to obtain some weak magnetic properties. The copper tube is placed in water, and a low voltage and high current is passed through the water to cause it to be weakly magnetized. But the magnet at this time still has no magnetism. In order to obtain permanent magnetization of the magnet and to obtain strong magnetism, we need a magnetizer to magnetize it. The hard magnetic substance is magnetized by the principle of electromagnetic induction. In this way, the magnet was born magically.


In addition, NdFeB magnets are currently found to have the highest commercial performance magnets, mainly Block Neodymium Magnet, segmental neodymium magnets, etc., which are known as magnetic kings and have extremely high magnetic properties. Its mechanical processing performance is also quite good. Operating temperatures up to 200 degrees Celsius. Moreover, its texture is hard, its performance is stable, and it has a good cost performance, so its application is extremely extensive. However, because of its strong chemical activity, it must be treated with a surface coating. (such as Zn, Ni, electrophoresis, passivation, etc.).


The magnet was introduced by Sumitomo Special Metals in 1984 and is the strongest magnet on the market. The strongest magnet before this was a samarium-cobalt magnet developed in Europe and America. Both magnets are now used as parts for small engines or speakers. The reason why many machines can be miniaturized can be said to benefit from a small and powerful magnet.


When such a magnet is used, when the magnet is used, people will not say that "the magnet is a substance that adsorbs iron, cobalt, or nickel." Rather, it will be associated with "any substance has magnetic induction", but the magnetic properties of iron, cobalt and nickel are strong, and the magnetic induction phenomenon is more obvious. Other materials can not see the magnetic induction phenomenon without using a strong magnet. In fact, the magnet is divided into two types: paramagnetism of iron absorption and reverse magnetism of repellent.


The above is how the magnets introduced by the Precast Concrete Magnet supplier are made, I hope to help everyone.

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