The sintered Nd-Fe-B magnets are usually formed by powder metallurgical processes. The general fabricating process routine is as follow:
· Melting------alloying ingot;
· Milling------powders with suitable particle size;
· Pressing-------magnetic field oriented green compaction;
· Sintering-------condensed magnet;
· Annealing------increase coercivity of the magnet;
· Magnetic properties testing;
· Grinding for rough magnet profile modification;
· Machining processes such as cutting, drilling or milling to final shape;
· Plating processes such as Ni, Zn, Al, epoxy coating etc.;
· Quality inspecting and testing for final products;
· Packing and delivering.