Forming die of sintered neodymium-iron-boron permanent magnet

Abstract

The invention belongs to the technical field of neodymium-iron-boron permanent magnet machining, and particularly relates to a forming die of a sintered neodymium-iron-boron permanent magnet. The forming die comprises a forming device, an anti-oxidation device and an extruding device, wherein the forming device comprises a female die, a raw material injection port, a lower pressure head and an upper pressure head, the female die is a hollow cylinder, and a containing cavity is formed in the female die. According to the forming die, inert gas can be introduced into the interior of the female die, so that neodymium-iron-boron material is prevented from being oxidized by oxygen in the injection process of the neodymium-iron-boron material, moreover, bublbles are avoided, and the quality of the neodymium-iron-boron permanent magnet is higher when the neodymium-iron-boron permanent magnet is manufactured; during use, firstly, an inert gas connecting port is connected with an inert gas source, and the inert gas is introduced into the interior of the female die, so that internal air is driven out, then the neodymium-iron-boron material is prevented from being oxidized during injection, then raw materials are injected into the female die through the raw material injection port, meanwhile, the inert gas is continuously introduced into the interior of the female die so that the neodymium-iron-boron material can be pressurized, the air inside the neodymium-iron-boron material can be extruded, and oxidation is avoided at the same time.

Description

technical field [0001] The invention belongs to the technical field of NdFeB permanent magnet processing, and more specifically relates to a molding die for sintered NdFeB permanent magnets. Background technique [0002] NdFeB permanent magnet materials can also undergo oxidation reactions quickly at room temperature. As the temperature increases, the oxidation phenomenon becomes more serious. During the process, the temperature needs to be raised to about 150C. Therefore, it is necessary to add various additives to study the influence of the oxidation resistance, fluidity, compressive strength and melt fluidity of the magnetic powder surface on the performance of the magnet. [0003] The original NdFeB permanent magnet will be oxidized with the increase of processing temperature during processing, which will cause the performance of the NdFeB permanent magnet material to decline when the permanent magnet is synthesized. The difference in shape may contain bit-discharged ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a molding die for sintered NdFeB permanent magnets, to solve the problem that the original NdFeB permanent magnets in the above background technology will be oxidized with the increase of processing temperature during processing. The performance of the NdFeB permanent magnet material is reduced when the permanent magnet is synthesized, and when the original mold is processing the material, due to the difference in the processing shape, there may be air bubbles discharged from the position, which reduces the performance of the permanent magnet.

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