Forming method and device of anisotropic neodymium iron boron bonded permanent magnet
An anisotropic and bonded magnet technology, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of difficult control of explosion parameters and poor safety of explosive explosion molding, so as to shorten the production cycle and avoid Difficulty in fabrication, effects of improved density and magnetic properties
Active Publication Date: 2013-06-26
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
The technology closest to the present invention is the explosive molding of NdFeB bonded magnets, as disclosed in patent CN200510111923.5, anisotropic NdFeB bonded magnets are prepared by explosive explosion, that is, a certain number of NdFeB magnets are arranged around the NdFeB magnetic powder. The explosives, using the shock wave generated by the explosion of the explosives to bond and compact the magnetic powder from multiple directions, this method can obtain anisotropic NdFeB magnets with high density and high magnetic properties, but the safety of explosive explosive molding is poor , and the explosion parameters are not easy to control, the forming method is difficult to popularize
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[0026] Example: uniformly mix anisotropic NdFeB magnetic powder with 0.5wt% binder and 0.15wt% curing agent, then put it into a split mold 8 with an inner diameter of φ4mm and a height of 5mm, and vibrate while loading Real, and at the same time apply a 1.2T magnetic field treatment, heating to a temperature of 110°C with a resistor 7. The parameters of the laser pulse beam 3 are that the spot diameter is φ4mm, the wavelength is 532nm, the pulse width is 8ns, and the energy of the laser pulse is 200mJ. After the above-mentioned laser-induced shock wave punching, after cooling in the split mold 8 for 45min, a φ4mm ×4mm anisotropic bonded NdFeB magnet, the magnet properties are: remanence Br=0.725T (Tesla), intrinsic coercive force jHc=689KA / m, maximum energy product (BH) max=85KJ / m 3 .
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Abstract
The invention discloses a forming method and device of an anisotropic neodymium iron boron bonded permanent magnet, belongs to the technical field of forming of bonded permanent magnets. According to the forming method and device, mixed powder of anisotropic neodymium iron boron magnetic powder, an epoxy resin binder and a curing agent is contained by adopting a split type mould, and is placed in a certain magnetic field for orientation, the mould and the mixed powder are heated to be up to a certain temperature through a resistor, and a laser impact irradiating the anisotropic neodymium iron boron powder directly is generated by using lasers to directly press the powder. According to the forming method and device, because a small amount of the binder is used and the pressure pressing of a higher laser impact wave is adopted, the magnetic property of a binding neodymium iron boron magnet is improved; and the powder is pressed when being heated, the forming procedure and the curing procedure are combined into one, and thus the circulation time of a product in the production process is reduced, the production period of the product is shortened, and the production efficiency is further improved.
Description
technical field [0001] The invention belongs to the technical field of bonded magnet molding, and in particular relates to a method and device for molding anisotropic NdFeB bonded magnets by using laser-induced shock waves, and is particularly suitable for pressing and molding miniature products. Background technique [0002] Neodymium iron boron (Nd-Fe-B) permanent magnet devices are widely used in many fields such as communications, information electronics, transportation, medical and health care, and have become indispensable components for many high-tech industries. With the development of modern industry, the demand for NdFeB applications in electric vehicles, wind power generation, large-scale high-speed motors, etc. is also expanding, and these fields require magnets to have good comprehensive performance, not only to have sufficient magnetic properties, but also to Higher requirements are put forward for the stability of working temperature, mechanical properties and...
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IPC IPC(8): B22F3/14H01F41/02
Inventor 张兴权左立生余晓流郑如周煜陈六三余建平李欢程伟
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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