NdFeB Magnet?the third generation of the rare earth magnetic material, is on of the best cost performance permanent magnetic materials with high coercive and excellent Br and Bh(max), which is made of Nd,Fe,B,Dy,Co and other minor elements. Because of good mechanical properties, it can be easily shaped into different sizes, therefore, it is widely used in motors, wind energy, Audio products, telecommunication, meters, magnetic resonance product, magnetic levitation product, VCM, MRI, etc.
Neodymium, Iron, Boron and a few transition metals will be made into the NdFeB powder, then fine NdFeB powder will be compacted in a die and sintered, fusing the powder into a solid material. There are 2 forms of pressing: die pressing and isocratic pressing. Sintered parts normally need some finish machining in order to meet final tolerances.
Machining & Tolerance
Generally, NdFeB magnets must be machined using diamond-grinding techniques. Sometimes, machining operations may be performed on NdFeB materials using carbide tools, but surface finishes thus obtained may be less than optimal. The Standard tolerances for NdFeB magnets are +/- 0.1mm for ground dimensions, but sticter tolerances are possible if specially required.
Magnetizing & Packing
NdFeB magnets require extremely high magnetizing fields, and can be magnetized in any direction as long as it is aligned properly. In some instances multiple pole magnetization is possible with special fixtures.All NdFeB magnets are anisotropic, and can only be magnetized in the orientation direction, so particular consideration must be given to this when designing complex assemblies, if it is intended to magnetize after assembly.NdFeB magnets are mechanically weak, and magnetically very strong. They should be packed properly in order to help user to use and handle them.