Multi-pole radial orientation sintered neodymium-iron-boron circular ring and preparation method thereof

The invention belongs to the technical field of sintered neodymium-iron-boron ring magnet preparation, and provides a multi-pole radial orientation sintered neodymium-iron-boron ring and a preparation method thereof, and the sintered neodymium-iron-boron ring is prepared by combining a plurality of tile-shaped sintered neodymium-iron-boron magnets; the stage number of the sintered neodymium-iron-boron circular rings is 4-72; the included angle of the orientation directions of the two adjacent poles of the sintered neodymium iron boron circular ring is 5-90 degrees. According to the multi-pole radial orientation sintered neodymium-iron-boron circular ring designed by the invention, the tile-shaped green bodies are firstly produced by adopting a forming process and then spliced into the circular ring structure, and compared with radiation forming orientation forming, the multi-pole radial orientation sintered neodymium-iron-boron circular ring has higher magnetic performance and higher percent of pass; and afte