An anisotropic bonded NdFeB multi-pole magnetic ring and its preparation method

Abstract

The invention provides an anisotropic bonded NdFeB multi-pole magnetic ring and a preparation method thereof. The multi-pole magnetic ring is an anisotropic bonded NdFeB 2n-pole magnetic ring, wherein n is greater than or equal to A natural number of 2, 2n splicing lines are faintly visible or clearly visible at the splicing of the magnetic tiles on the magnetic ring, and the magnetic ring is an anisotropic tile type bonded with 2n center angles of π / n after orientation pressing The blanks are spliced ​​and pressed in a secondary molding method after the ring mold. The preparation method of the invention has the characteristics of high magnetic ring orientation degree, high orientation magnetic field strength, easy availability and good versatility, adjustable demagnetization magnetic field strength, short production process, high production efficiency, low cost and the like.

Description

technical field [0001] The invention relates to an anisotropic bonded NdFeB multi-pole magnetic ring and a preparation method thereof. Background technique [0002] Among anisotropic NdFeB magnetic rings, bonded NdFeB multipolar magnetic rings are compared with sintered NdFeB multipolar magnetic rings and hot-pressed and heat-deformed NdFeB multipolar magnetic rings, although their maximum magnetic energy product is lower. 30-50%, but it has the advantages of high material utilization rate, high dimensional accuracy, short manufacturing cycle, and easy processing. Therefore, anisotropic bonded NdFeB multipole magnetic ring has developed rapidly in recent years and has a good market prospect. [0003] However, the difficulty of preparing anisotropic bonded NdFeB multipole magnetic rings is far more difficult than that of isotropic bonded NdFeB magnetic rings. The difficulty in the preparation of anisotropic bonded NdFeB multipolar magnetic rings mainly lies in the design of t...

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Problems solved by technology

Although the patent proposes that its method can also be used for bonded magnets, except that the same bonded magnet and sintered magnet have similar matrix components, other preparation principles and methods are completely different, from the process flow, preparation environment, preparation equipment, to the preparation process. The powder preparation method, powder particle size, powder shape, binder, additive, powder formability and molding conditions, sintering or curing conditions, etc. are different, and the key process methods of its preparation have almost no translation and reference value

If this method is to be used in the preparation of bonded magnets, according to the characteristics of the preparation process of bonded magnets, it is not difficult to find that when using this method to compact two parts of bonded magnetic powder, especially the first two parts of bonded magnetic powder, the Under the action, the magnetic powder at the 2nd part of the pressure will partially move to the other non-pressurized parts of the annular cavity, destroying the uniformity of the magnetic powder in the annular cavity, in order to seek the balance of the force, and the final result is the prepared magnetic ring The circumferential density distribution is uneven, the magnetic properties of the magnetic ring are poor in uniformity, and the circumferential size is poor in consistency, and every two parts undergoes at least two orientation compaction processes and one demagnetization process, resulting in long production cycles and low efficiency.

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