A kind of NdFeB magnet manufacturing method

Abstract

The invention discloses a method for manufacturing a neodymium iron boron magnet. The method comprises steps of raw material preparation and pretreatment, a magnet is weighed, broken, cut and derusted by a steel cutter and a barrel polishing machine; smelting, the pretreated magnet is smelted by a vacuum smelting furnace to form neodymium iron boron alloy; hydrogen explosion, hydrogen explosion of the smelted neodymium iron boron alloy is performed by a vacuum hydrogen treatment furnace; milling, a magnet crusher is utilized to break neodymium iron boron alloy pieces after hydrogen explosion into powder; molding orientation, the powder is shaped through utilizing a magnetic field press and an isostatic press; sintering, a formed semi-finished product is sintered by a vacuum sintering furnace; and machining, the sintered NdFeB magnet is machined through utilizing a grinding machine. The method is advantaged in that the method is simple to implement, can fully stir the magnet pieces heated in a crucible to achieve uniform heating, and avoid the need for secondary rework due to uneven heating due to local heat unevenness.

Description

technical field [0001] The invention belongs to the field of NdFeB magnet processing, and in particular relates to a manufacturing method of NdFeB magnets. Background technique [0002] As the third generation rare earth permanent magnet material, NdFeB magnets have a high performance-price ratio. NdFeB magnets are widely used in energy, transportation, machinery, medical, IT, home appliances and other industries, but traditional NdFeB magnets The processing method will make the magnet fragments in the middle of the crucible unable to be completely smelted because the inner flame temperature of the flame is lower than the outer flame during smelting. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the present invention provides a NdFeB magnet manufacturing method capable of uniformly stirring the magnet fragments in the crucible so that the magnet fragments in the crucible are evenly heated and completely dissolved. [0004] In o...

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Problems solved by technology

[0002] As the third generation rare earth permanent magnet material, NdFeB magnets have a high performance-price ratio. NdFeB magnets are widely used in energy, transportation, machinery, medical, IT, home appliances and other industries, but traditional NdFeB magnets The processing method will make the magnet fragments in the middle of the crucible unable to be completely smelted because the temperature of the inner flame of the flame is lower than that of the outer flame during smelting.

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