Injection molding anisotropic bonded neodymium-iron-boron magnetic shoe radiation orientation forming method and device

Abstract

The invention provides an injection molding anisotropic bonded neodymium-iron-boron magnetic shoe radiation orientation forming method and an injection molding anisotropic bonded neodymium-iron-boronmagnetic shoe radiation orientation forming device. The device comprises an A-type oriented permanent magnet, a B-type oriented permanent magnet, a C-type oriented permanent magnet, a magnetic flow channel, an inner mold core and a non-magnetic outer mold core, the problems that a conventional built-in permanent magnet orientation field adopted by an anisotropic injection molding neodymium-iron-boron bonded magnet is low, and the orientation degree of a product is not high are solved, the orientation magnetic field in the mold is larger than 1T based on the HALBACH array and combination of permanent magnets of different specifications, and then the injection molding neodymium-iron-boron orientation process is met. On the basis of permanent magnet orientation magnetic circuit combination design, anisotropic injection molding neodymium iron boron tile-shaped magnet radiation orientation is achieved, the material performance (BH)max is larger than 11 MGOe, and the product surface magneticinduction intensity is larger than 2000 Gs.

Description

technical field [0001] The invention relates to a permanent magnet radiation orientation forming device for injection molding NdFeB magnetic tiles, in particular to a radiation orientation forming device for injection molding anisotropic bonded NdFeB magnetic tiles. Background technique [0002] As a third-generation permanent magnet, NdFeB is widely used in household appliances, automobiles, computers, aerospace, medical equipment and other fields due to its high magnetic energy product and good temperature resistance. As one of them, bonded NdFeB has the advantages of high Br, (BH)max, diversified molding processes, and large degree of freedom in product structure and size. Its application places and fields are being greatly expanded. In recent years, its annual output has been growing rapidly. [0003] Bonded magnet is a new type of composite material prepared by using rare earth permanent magnet powder and organic resin as binder through powder metallurgy, injection mol...

AI Technical Summary

Problems solved by technology

Due to the high coercive force of this type of magnetic powder, it is necessary to have a sufficient external magnetic field in the mold cavity, otherwise the easy magnetization direction of the magnetic powder is not enough to fully face the direction of the external magnetic field, thus forming a bonded magnet with incomplete orientation , the performance of this type of bonded magnet is relatively low

There are two main ways to apply the orientation magnetic field corresponding to the injection molding process. One is the built-in type. The orientation permanent magnet or electromagnet is directly built into the mold. The magnetic circuit structure is relatively simple, and the magnetic consistency of the product is relatively good, but the conventional single The orientation magnetic field strength of the magnet combination is relatively low, and the orientation degree of the injection molding process is poor; the other is the external type, which can provide sufficient orientation magnetic field by using several sets of electromagnetic coils installed outside the mold, but the mold needs to pass through different types of magnetic conduction. / Non-magnetic material guides the magnetic circuit

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