Dongguan Weida Magnetic Industry Co., Ltd. is located in Tiantou First Industrial Zone, Hengli Town, Dongguan City, Guangdong Province. It was registered and operated in July 2009 and has passed the ISO9001-2015 quality system certification; A high-tech enterprise specializing in the research and production of neodymium iron boron magnetic materials, certified by the ISO9001-14000 environmental system, and its high-performance sintered neodymium iron boron (Nd Fe-B) permanent magnets. Nd-Fe-B rare earth permanent magnet, as the third-generation permanent magnet material, is the foundation material for the electromechanical and information industries with the best performance among international magnetic materials and is currently irreplaceable. Its main products are high remanence and high coercivity, which have excellent characteristics such as high magnetic field strength, good temperature resistance, long-lasting magnetism and never demagnetization. It is widely used in many industries and fields such as new energy vehicles, motors, and electroacoustics. In various high-end applications, it is demonstrating its first-class professional level and growing into a high-quality supplier of magnetic materials that customers can choose from.
Material melting
Coming from and surpassing subversion
The dual alloy multi main phase process using optimized design of high corrosion resistant secondary phase and multi basic phase mixed powder production ensures long-term stability of the magnetic domain produced, with a magnetic service life of more than 10 years and a attenuation of less than 4%.
Technological process
Hydrogen fragmentation
Coming from and surpassing subversion
The oxygen content in the magnet is controlled within the range of 400-900ppm using methods such as "rapid solidification strip casting", "powder metallurgy", and self-developed "oxygen free production process" and "low potential secondary phase".
Technological process
Airflow mill
Coming from and surpassing subversion
The use of heavy rare earths in high-end products (with comprehensive magnetic performance (magnetic energy product+intrinsic coercivity reaching 72) has been reduced by 10-30%. Mid range products with performance grades of 40SH and below do not use heavy rare earth elements (Dy, Tb), and the product price is highly competitive.
Technological process
Compression molding
Coming from and surpassing subversion
Insert the crushed magnetic powder into the mold, apply an external magnetic field for orientation, and press the powder after orientation. Powder magnetic field orientation is one of the key processes for producing high-performance sintered neodymium iron boron. In terms of molding technology, there are currently three commonly used methods in the industry: molding method, molding plus cold isostatic pressing, and rubber mold isostatic pressing. Under the same neodymium content, rubber mold isostatic pressing can obtain a larger magnetic energy product.
Technological process
Heat treatment
Coming from and surpassing subversion
After pressing, the relative density of the magnet compacts is relatively high. In order to achieve high permanent magnetic performance of the magnet, it is necessary to heat the compacts to a temperature below the basic melting point of the powder for a period of time, which is also known as sintering. After high-temperature quenching, it is necessary to perform tempering treatment at a certain temperature to optimize the microstructure and obtain the best magnetic properties. (Tempering refers to cooling the sintered magnetic powder blank to a certain temperature and then heating it up again.)
Technological process
Machining
Coming from and surpassing subversion
Due to the characteristics and technical limitations of the magnetic field oriented forming process, it is difficult for sintered magnets to directly achieve the shape and dimensional accuracy of practical applications at once. Many finished magnets have small volumes and complex shapes, and can only be processed from rough magnets of a certain shape. Sintered neodymium iron boron material is hard and brittle, and general mechanical processing can only be carried out by cutting, drilling, grinding, and rolling.
Technological process
Surface treatment
Coming from and surpassing subversion
Sintered neodymium iron boron is a highly chemically active powder material with small pores and voids inside, which are prone to corrosion and oxidation in the air. Over time, it will cause attenuation or even loss of magnetic properties. Therefore, strict surface anti-corrosion treatment must be carried out before use. At present, neodymium iron boron anti-corrosion treatment commonly adopts methods such as electroplating, chemical plating, electrophoresis, and phosphating, among which electroplating is widely used as a mature metal surface treatment method.
Technological process
Magnetization
Coming from and surpassing subversion
Magnetization is a crucial step in obtaining magnetism in sintered neodymium iron boron permanent magnets. A magnetization machine is a tool for magnetizing magnetic materials or devices, by applying a magnetic field to the magnetized neodymium iron boron magnet. If the magnetized magnetic field cannot reach the technical saturation magnetic field, the residual magnetism Br and coercive force Hcj of the permanent magnet cannot reach the expected values. In addition to ordinary monopole magnetization, sintered neodymium iron boron can also be subjected to multipole magnetization according to actual needs, that is, after magnetization, multiple N and S poles can appear on a plane.
Technological process
Packaging and shipping
Coming from and surpassing subversion
Packaging and shipping is the last step before the magnet leaves the factory. Magnet manufacturers can package according to the requirements of the purchaser. If the purchaser has special packaging requirements, they can explain them to the supplier in advance. Sintered neodymium iron boron permanent magnets have strong magnetism, so land transportation is generally used for domestic transportation. Exported to the open sea through special barriersAfter magnetic packaging and professional organization testing and identification, air freight can be used.
Technological process
136-8895-2526
136-8895-2526
Dongguan Weida Magnetic Industry Co., Ltd., No. 6 Longxing Road, Hengli Town, Dongguan City, Guangdong Province
