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A method and device for pressing and forming permanent magnets

A press-forming, permanent magnet technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, circuits, etc., can solve the problems of limited magnet performance, large volume of preparation structure, and inability to meet actual engineering needs.

Active Publication Date: 2022-02-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a permanent magnet pressing molding method and device, which are used to solve the technical problem that the existing permanent magnet pressing molding process cannot meet the actual needs of the project due to the large volume of the prepared structure and the limited performance of the produced magnet.

Method used

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  • A method and device for pressing and forming permanent magnets
  • A method and device for pressing and forming permanent magnets
  • A method and device for pressing and forming permanent magnets

Examples

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Effect test

Embodiment 1

[0039] A permanent magnet press molding method 100, such as figure 1 shown, including:

[0040] Step 110, setting the driving coil so that an electromagnetic force is generated when there is a transient current in the driving coil, so as to apply a forming pressing force to the magnetic powder to be pressed; at the same time, setting an orientation coil so that an orientation magnetic field is generated when a current is passed in the orientation coil, so that Make the magnetic powder to be pressed anisotropic;

[0041] Step 120, synchronously feed the transient current to the drive coil and the orientation coil to synchronously generate the electromagnetic force and the orientation magnetic field, and complete the press molding of the permanent magnet; wherein, by changing the parameters of the transient current, the magnitude of the electromagnetic force and The strength of the orientation magnetic field.

[0042] An electromagnetic coil is used to generate an orientation ...

Embodiment 2

[0058] A permanent magnet pressing and forming device includes: a driving module, a pressure head, a mold, and an orientation coil. Among them, the center of the mold is provided with a groove for filling the magnetic powder to be pressed; the bottom of the indenter is in contact with the magnetic powder to be pressed, and the top is in contact with one end of the drive module, and the central axes of the indenter and the groove coincide; The electromagnetic force in the permanent magnet pressing molding method described in the first embodiment above is used to drive the pressure head to apply the molding pressing force to the magnetic powder to be pressed; Orientation magnetic field in permanent magnet press-forming method.

[0059] The driving module includes: two driving coils, or one driving coil, or one driving coil and a driving board. It is used to pass in transient current to generate transient magnetic field, cooperate with the drive board to generate electromagnetic...

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Abstract

The invention belongs to the field of permanent magnet compression molding, and specifically relates to a permanent magnet compression molding method, which includes: setting a driving coil, so that an electromagnetic force is generated when a transient current flows through the driving coil, so as to apply a molding compression force to the magnetic powder to be pressed; setting Orientation coils, so that orientation coils generate orientation magnetic fields when transient currents pass through them, so that the magnetic powder to be pressed is anisotropic; synchronously pass transient currents to the drive coils and orientation coils to synchronously generate electromagnetic forces and orientation magnetic fields, The press molding of the permanent magnet is completed; the magnitude of the electromagnetic force and the strength of the orientation magnetic field are respectively changed by changing the peak value of the transient current. The method adopts transient coils to generate an orientation magnetic field, and the orientation magnetic field can reach a high level, thereby improving the magnetic performance of the permanent magnet; using the transient coil to generate electromagnetic force to suppress the magnetic powder, increasing the density of the permanent magnet, and the pressing time is short, which solves the problems in the prior art The electromagnet has a large volume and cannot further increase the strength of the orientation magnetic field, which is practical and strong.

Description

technical field [0001] The invention belongs to the field of permanent magnet compression molding, and more specifically relates to a permanent magnet compression molding method and device. Background technique [0002] At present, the permanent magnet production processes involved in industry mainly include sintering, bonding, casting and hot pressing and thermal deformation. Among them, the sintering process is the most widely used production process. Most of the sintered permanent magnets are anisotropic magnets. The loose magnetic powder is placed in the cavity of the press to form it under the action of an external orientation magnetic field and pressure. The magnetic powder After oriented pressing and molding, it will be sintered into a sintered permanent magnet. [0003] The bonding process is to place the mixture of magnetic powder and binder in the cavity of the press to form it under pressure without going through the sintering process. If the magnetic powder has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F13/00H01F41/02
CPCH01F13/003H01F41/0266H01F41/0273B22F3/087B22F2999/00B30B11/008C22C2202/02B22F3/02B22F2003/033B22F3/03B30B1/42B22F2202/05B22F3/003
Inventor 李亮吕以亮吴添
Owner HUAZHONG UNIV OF SCI & TECH
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