Fabricating Process of Neodymium Magnets 20170313-3
Permanent Magnets Manufacturer China Rare Earth Magnet Limited
1. Raw Materials Preparation and Preprocessing
It is to do some preprocessing like weigh, smash, rust cleaning to the raw materials.
Processing Equipment: Steel bar Shearing Machine/Tumbling Machine
2. Smelting of Neodymium Permanent Magnet
Compound the preprocessing materials of praseodymium neodymium, pure iron and Ferro-boron in certain proportion, and make high-temperature melting in vacuum melting furnace with argon protection. After that, make melt-spinning to achieve homogeneous composition and great degree of orientation.
Processing Equipment: Vacuum Melting Furnace
3. Hydrogen Explosion
As the hydrogen absorption character among rare earths, the neodymium alloy will expand and crack in hydrogen, which makes neodymium have a loose structure. The process not only improves powdering efficiency, but also lowering cost greatly.
Processing Equipment: Vacuum Hydrogen-treated Furnace
4. Powdering Process
Without any pollution and any abrasion to the machine, powdering process is to make high velocity impact for the materials themselves by Airflow Grinder, which is efficient and convenient.
Processing Equipment: Airflow Grinder
5. Molding and Orientation
Molding is to make the powder a fixed size and shape, and orientation is to determine a magnetized direction for the disorder powders. Commonly, the magnetic field pressing machine and isostatic pressing machine and used in this process, while for the special shaped NdFeB permanent magnets, it is necessary to use mold to shaping directly.
Processing Equipment: Magnetic Field Pressing Machine/ Isostatic Pressing Machine
6. Sintering
Having a series of physical and chemical changes of the materials in high temperature, sintering is the last step of forming process, which is vital to the density and micro-structure of neodymium magnets.
Processing Equipment: Vacuum Sintering Furnace
7. Machining
The neodymium magnets after sintering are just workblank, and the further machining is necessary to achieve an accurate dimensions and shape. Generally, there are two ways of machining: Grinding and Cutting.
Processing Equipment: Flat Grinder/Paralled Surface Grinding Machine/Chamfering Machine
8. Surface Treatment
Surface treatment like Ni, Zn, NiCuNi, phosphate and so on, are necessary to achieve a good appearance and corrosion resistance.
9. OQC and Packaging
Before packaging, the permanent magnet manufacturer should do a series of inspection, such as high temperature test, salt spray test, etc. to ensure the magnets meet requirements.
1. Raw Materials Preparation and Preprocessing
It is to do some preprocessing like weigh, smash, rust cleaning to the raw materials.
Processing Equipment: Steel bar Shearing Machine/Tumbling Machine
2. Smelting of Neodymium Permanent Magnet
Compound the preprocessing materials of praseodymium neodymium, pure iron and Ferro-boron in certain proportion, and make high-temperature melting in vacuum melting furnace with argon protection. After that, make melt-spinning to achieve homogeneous composition and great degree of orientation.
Processing Equipment: Vacuum Melting Furnace
3. Hydrogen Explosion
As the hydrogen absorption character among rare earths, the neodymium alloy will expand and crack in hydrogen, which makes neodymium have a loose structure. The process not only improves powdering efficiency, but also lowering cost greatly.
Processing Equipment: Vacuum Hydrogen-treated Furnace
4. Powdering Process
Without any pollution and any abrasion to the machine, powdering process is to make high velocity impact for the materials themselves by Airflow Grinder, which is efficient and convenient.
Processing Equipment: Airflow Grinder
5. Molding and Orientation
Molding is to make the powder a fixed size and shape, and orientation is to determine a magnetized direction for the disorder powders. Commonly, the magnetic field pressing machine and isostatic pressing machine and used in this process, while for the special shaped NdFeB permanent magnets, it is necessary to use mold to shaping directly.
Processing Equipment: Magnetic Field Pressing Machine/ Isostatic Pressing Machine
6. Sintering
Having a series of physical and chemical changes of the materials in high temperature, sintering is the last step of forming process, which is vital to the density and micro-structure of neodymium magnets.
Processing Equipment: Vacuum Sintering Furnace
7. Machining
The neodymium magnets after sintering are just workblank, and the further machining is necessary to achieve an accurate dimensions and shape. Generally, there are two ways of machining: Grinding and Cutting.
Processing Equipment: Flat Grinder/Paralled Surface Grinding Machine/Chamfering Machine
8. Surface Treatment
Surface treatment like Ni, Zn, NiCuNi, phosphate and so on, are necessary to achieve a good appearance and corrosion resistance.
9. OQC and Packaging
Before packaging, the permanent magnet manufacturer should do a series of inspection, such as high temperature test, salt spray test, etc. to ensure the magnets meet requirements.
