Cold treatment device and processing method of neodymium-iron-boron magnet

Abstract

The cold treatment device comprises a melt-spinning furnace, a stirring furnace, a soaking furnace, a profiling furnace, a first conveying pipe, a second conveying pipe, a third conveying pipe, a first pressure pump, a second pressure pump and a third pressure pump, the melt-spinning furnace comprises a melt-spinning furnace inner cavity, a preheating layer, an evacuation pump, an evacuation pipe and a melt-spinning furnace base, the stirring furnace comprises a stirring furnace inner cavity, a cooling layer, a stirring device, a stirring furnace base, a stirring motor, a stirring shaft and stirring blades. According to the cold treatment device for the neodymium-iron-boron magnet and the machining method of the neodymium-iron-boron magnet, the nitrogen spraying device in the soaking furnace can conduct cold treatment on the neodymium-iron-boron magnet in liquid nitrogen, crystal grains and crystal boundary phases on the surface layer of the neodymium-iron-boron magnet cannot be damaged, and the profiling furnace can increase the magnetism of the neodymium-iron-boron magnet; the neodymium-iron-boron magnet has a wide hysteresis loop, high coercive force and high residual magnetism, and the controller can control the duration of soaking in the soaking furnace and set the duration of the powder making device and the duration of the forming press.

Description

technical field [0001] The invention relates to the technical field of cold treatment devices, in particular to a cold treatment device of a neodymium iron boron magnet and a processing method thereof. Background technique [0002] As a rare earth permanent magnet material, NdFeB has extremely high magnetic energy product and coercive force, and at the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology. It is possible to reduce the size, weight and thickness of equipment such as instruments, electroacoustic motors, and magnetic separation and magnetization. The advantages of NdFeB are high cost performance and good mechanical properties; the disadvantages are that the working temperature is low, the temperature characteristics are poor, and it is easy to be pulverized and corroded. It is necessary to adjust its chemical composition and take certain treatments to improve its related p...

AI Technical Summary

Problems solved by technology

The advantages of NdFeB are high cost performance and good mechanical properties; the disadvantages are that the working temperature is low, the temperature characteristics are poor, and it is easy to pulverize and corrode. It is necessary to adjust its chemical composition and take certain treatments to improve its related properties. Meet the requirements of practical application

[0003] Under the existing technology, for the cold treatment process of NdFeB magnets, the current cold treatment machine can only cold process NdFeB magnets with one magnetic flux, which cannot be applied to multi-scenario working environments, and in its processing process, It is easy to cause damage to the grains and grain boundary phases on the surface of the NdFeB magnet, damage the magnetic properties of the NdFeB magnet, and cause the NdFeB magnet to induce subtle structural changes and stress redistribution; Iron boron magnets lose wide hysteresis loops, high coercivity and high remanence

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