Sintered magnet preparation method and pressure forming equipment thereof
A technology of sintered magnets and molding equipment, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc. It can solve the problems of short life of rubber molds, irregular product shapes, and unsatisfactory magnetic properties of permanent magnets in the way of pressure.
Active Publication Date: 2021-03-19
TAIYUAN KAIYUAN INTELLIGENT EQUIP CO LTD +1
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Problems solved by technology
[0003] The invention solves the problems of unsatisfactory magnetic properties of the obtained permanent magnets, irregular shape of the product, and short service life of the rubber mold caused by the unreasonable pressure application method in the above-mentioned prior art, and provides a preparation method of sintered magnet and its pressure molding equipment
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[0018] The preparation method of the sintered magnet is realized by the following steps, 1) filling the magnetic powder into the rubber mold, and making the magnetic powder reach a certain density in the rubber mold; 2) applying a magnetic field to the rubber mold to orient the magnetic powder in the rubber mold; 3 ) Apply quasi-isostatic pressure to the rubber mold: During the pressing process, the magnetic powder in the rubber mold is not actively pressed in the direction of the orientation magnetic field and the length in the direction of the orientation magnetic field remains unchanged, and the other surfaces outside the two ends of the orientation magnetic field direction Subject to isostatic pressing to obtain a magnetic powder compact; 4) Sinter the magnetic powder compact to obtain a sintered magnet.
[0019] In order to obtain a better shape, the higher the packing density, the better, but when the density exceeds a certain level, the orientation will be affected. Afte...
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Abstract
The invention relates to a preparation method of a sintered magnet and equipment thereof, particularly relates to the preparation method of the sintered magnet and compression molding equipment thereof and aims to solve problems that in the prior art, magnetic performance is not ideal, the product shape is irregular, and the service life of a rubber mold is short due to an unreasonable pressure applying mode. The preparation method of the sintered magnet is realized by steps of 1) filling magnetic powder into the rubber mold and enabling the magnetic powder to reach a certain density in the rubber mold; 2) applying a magnetic field to the rubber mold to orientate the magnetic powder in the rubber mold; (3) applying quasi-isostatic pressing to the rubber mold, specifically, in the pressingprocess, not actively pressing the magnetic powder in the rubber mold in the orientation magnetic field direction, keeping the length of the magnetic powder in the orientation magnetic field directionunchanged, applying isostatic pressing to other surfaces except the two end faces in the orientation magnetic field direction, and obtaining a magnetic powder pressed shape; and 4) sintering the magnetic powder pressed shape to obtain the sintered magnet. The method is advantaged in that the method is more suitable for magnets in the shape of a rotating body, such as magnets in cylinders, balls and rings.
Description
technical field [0001] The invention relates to a preparation method of a sintered magnet and equipment thereof, in particular to a preparation method of a sintered magnet and pressure forming equipment thereof. Background technique [0002] The current mainstream magnetic field forming method is a two-step forming method, which involves magnetic field forming and isostatic pressing, which is difficult to automate. The Chinese patent application CN91107588.7 discloses "Method and device for manufacturing permanent magnet". The method is to fill the magnetic powder into the rubber mold with a certain density, press the rubber mold and the magnetic powder inside, and complete the pressure molding of the magnetic powder to obtain a magnetic powder compact, which is sintered to obtain a permanent magnet. Due to the unreasonable way of applying pressure in this method, the magnetic performance of the obtained permanent magnet needs to be improved. At the same time, since its pr...
Claims
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IPC IPC(8): H01F41/02
CPCH01F41/0253H01F41/0266
Inventor 董永安郑方
Owner TAIYUAN KAIYUAN INTELLIGENT EQUIP CO LTD