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What is injection magnets
Sep 01, 2018

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The injection magnets is composed of nylon magnetic powder and produced by injection molding with special injection molding machine. Compared with other methods of making permanent magnet, injection molding has unique and irreplaceable advantages.


What are the unique advantages of injection magnets?


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Injection molding can make magnets with complex shapes. In addition, the injection molding process can use "embedded molding", "multi-step molding" and "multi-part molding" to combine the magnet and other parts into one, thus saving the cost of secondary processing and assembly. Injection molding technology can produce both isotropic and anisotropic magnets. When anisotropic magnets are formed, an oriented magnetic field is applied to make the magnetic powder have a certain orientation in the polymer in the molten state, that is, the orientation occurs, and multipole magnetization can be realized. The injection molding process makes the product have better consistency in size and performance. During the molding process, the mold cavity is completely filled with the material at the highest concentration under the strong injection pressure. In addition, the material contains thermoplastic binder, which makes the magnet obtain good physical and mechanical properties.


Property: due to the high content of polymer binder in the injection magnet, the magnet itself has a strong corrosion resistance, which usually does not require surface coating protection.


Dimensional accuracy: because the size of the injection molding product is consistent with that of the injection mold cavity, the dimensional accuracy of the product can be controlled relatively high. In addition, the size of the product will change due to shrinkage of the binder in the material during cooling. The degree of shrinkage depends on the thickness and shape of the product. The typical size tolerance is: + / - 0.05mm.


PS: injection magnetic also has one feature: it can be resistant to 20~150 degrees of non-demagnetization! The magnetic strip of the motor will demagnetization when the working environment is over 80 degrees.


Injection molding magnets are widely applied in automation equipment, rotor brushless dc motor rotor, frequency, frequency conversion air conditioning fan motor rotor motor, brushless dc refrigerator damper motor rotor, energy-saving smoke lampblack machine, automobile fuel tank magnetic ring, instrument, lamps and lanterns, printer and copier magnetic roller, buffer cylinder, water pump motor, water heaters accessories, energy-saving induction cooker, swimming pool equipment pipe fittings, motorcycles, cameras, clocks and watches, audio, all kinds of motor sensing devices, home appliances, home floor electric fan, ceiling fan, exhaust fan, cooling fan, blower, office automation, transmission, all kinds of toys, magnetic therapy of medicine and health products and daily life all the fields Domain etc.