We all know that magnets have various shapes, such as square, round, bar, circular, tile and other shapes. Among them, discs are more common, so permanent magnets are How did it happen? How are powerful magnets produced? Is the process simple?
As the name implies, a permanent magnet is an object that can maintain its own magnetism for a long time without an external magnetic field. Depending on the material, it can generally be kept for many years. The permanent magnet can be made of ferromagnetic materials, such as iron and nickel.
Its atomic structure is special, and the atom itself has a magnetic moment. Generally, the molecular arrangement of these minerals is chaotic, and the magnetic regions interact with each other to show magnetism, but under the guidance of an external force such as a magnetic field, the molecular arrangement direction tends to be the same, and it shows magnetism, which is commonly known as a magnet, iron, cobalt, nickel, is The more commonly used magnetic substances are basically divided into permanent magnets and soft irons. Permanent magnets are added with strong magnetism to make the spin and electron angular momentum of the magnetic substances align in a fixed direction; Iron slowly loses its magnetism. Magnet is just a general term, which generally refers to things with magnetism, and the actual composition does not necessarily contain iron. The purer metallic iron itself has no permanent magnetism, only when it is close to the permanent magnet will it be induced to generate magnetism. The general permanent magnet is added with other impurity elements such as carbon to stabilize the magnetism, but this will make the electrons free It is low and not easy to conduct electricity, so the bulb will not light up when the current passes. Iron is a common magnetic element, but many other elements have stronger magnetism. Many powerful magnets are made of a mixture of rubidium, iron and boron. Resistivity is the measure by which a permanent magnetic material maintains its permanent magnetism against magnetic and non-magnetic disturbances.
Manufacture of magnets
How are permanent magnets made? Some substances can be rubbed into magnets. The material is either iron or steel, but not all steels can be made into magnets because they contain their substances. Stainless steel cannot act as a magnet.
Let's make a magnet. A magnet and a screwdriver are the materials you need. Use a magnet to rub the metal part of the screwdriver. From one end to the other, they rub repeatedly to create a magnetic screwdriver.
Magnet production process:
How are powerful magnets produced? The manufacturing process of NdFeB magnets, SmCo magnets, AlNiCo magnets, and ferrite magnets is also different. In terms of technology, there are sintered NdFeB magnets and bonded NdFeB magnets. We mainly talk about sintered NdFeB magnets.
Magnet process:
Batching → smelting ingot making → powder making → pressing → sintering and tempering → magnetic testing → grinding → pin cutting → electroplating → finished product.
Among them, the ingredients are the basis, and sintering and tempering are the key. Production tools for NdFeB magnets include melting furnaces, jaw crushers, ball mills, jet mills, compression molding machines, vacuum packaging machines, isostatic presses, sintering furnaces, heat treatment vacuum furnaces, Magnetic performance tester, Gauss meter.
NdFeB magnet processing tools:
There are special slicing machines, wire cutting machine tools, flat grinding machines, double-sided machines, punching machines, chamfering machines, and electroplating equipment.