Manufacturing method for rare earth-iron-boron permanent magnet magnetic ring

The invention relates to a manufacturing method for a magnetic ring, in particular to a manufacturing method for a rare earth-iron-boron permanent magnet magnetic ring, which is used for solving the problem that either a radiation magnetic ring prepared with the prior art cannot be prepared into a multi-pole magnetic ring or the mechanical strength is insufficient. The manufacturing method comprises the following steps of: (1) machining permanent magnets into magnets of regular shapes which can be arranged into a complete circular ring; (2) cleaning the surfaces of the magnets of regular shapes; (3) arranging a layer of film material between two adjacent magnets, arranging into a complete circular ring, and putting into a fixing device for clamping; and (4) putting the magnetic ring and the fixing device into a vacuum sintering furnace, and adjusting the vacuum degree in the furnace below 10 Pa. The manufacturing method has the advantages that a reasonable design is adopted, and the mechanical strength of a radiation magnetic ring of the rare earth-iron-boron permanent magnet manufactured from a flux alloy film material by using the method is increased greatly.