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Permanent magnet production method

一种永磁体、成型体的技术，应用在永磁体制造、制造工具、电感/变压器/磁铁制造等方向，能够解决永磁体断开部分龟裂、产率降低、磨削量增大等问题，达到优异磁各向异性、提高生产效率、改善产率的效果

Active Publication Date: 2013-07-10
DAIDO STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the manufacturing method disclosed in Japanese Patent Laid-Open No. 2001-15325, there is a concern that when the body is extruded, the crystal orientation at the portion of the columnar body broken by the fin of the mandrel is misaligned, and thus the obtained permanent The magnetic properties of the magnet decrease at the disconnected portion
In addition, since the green body is broken while being extruded, stress increases at the broken portion, and the broken portion of the obtained permanent magnet may be cracked.
Therefore, the cracked defective portion must be ground off in a later step, resulting in a problem that the amount of grinding increases so that the yield decreases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0041] figure 1A preferred embodiment of the extrusion device used in the permanent magnet manufacturing method is shown. The extrusion device 10 includes: an extrusion die 12 in which a through hole 12a is formed so as to penetrate the extrusion die along the extrusion direction; The opening is inserted into the through hole 12a; and the mandrel 16 which is inserted into the through hole 12a from the other opening of the through hole and has a diameter smaller than the diameter of the through hole 12a. In the state where the mandrel 16 is inserted into the through hole 12a, between the inner surface of the through hole 12a (the inner wall of the extrusion die 12 defining the through hole 12a) and the outer surface of the mandrel 16, along the mandrel The manner in which the entire periphery of 16 communicates defines a fill space. The filling space 20 is formed as a cylindrical space composed of a plurality of molding spaces 20a which are continuously defined in such a mann...

Embodiment approach 1

[0045] In Embodiment Mode 1, a manufacturing process of the permanent magnet 18 having a rectangular cross section will be described. In Embodiment 1, such as figure 2 As shown, a through hole 12 a having a substantially rectangular opening shape is formed in the extrusion die 12 . In addition, in the extrusion die 12 , a slope inclined at a predetermined angle (45° in this embodiment) is formed at each corner of the through hole 12 a. The mandrel 16 has a rectangular cross section smaller than the through hole 12a. Next, in a state where the mandrel 16 is inserted into the through hole 12a, a filling space 20 having an angular cylindrical shape as a whole is defined along the entire outer circumference of the mandrel 16. As shown in FIG. In the state where the mandrel 16 is thus arranged, molding spaces 20a each having a rectangular section are defined outside the four surfaces of the mandrel 16, and by connecting these molding spaces 20a together at the corners of the thr...

Embodiment approach 2

[0051] Although the manufacture of the permanent magnet 18 having a rectangular cross section has been described in Embodiment 1, by changing the respective shapes of the mandrel 16 and the through hole 12a in the extrusion die 12, it is possible to manufacture a permanent magnet having a shape such as Figure 4B A permanent magnet 32 ​​of crescent cross-section is shown.

[0052]That is, when manufacturing the permanent magnet 32 ​​having a crescent-shaped cross section, the respective shapes of the mandrel 16 and the through hole 12a are set so that in the state where the mandrel 16 is inserted into the through hole 12a, the mandrel 16 A cylindrical filling space 20 is defined between the outer surface of the through hole 12a and the inner surface of the through hole 12a. In the cylindrical filling space 20, forming spaces 20a each having a crescent-shaped cross-section extend in the circumferential direction in a communicating manner. Next, by pressing the columnar preform ...

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Abstract

With a mandrel inserted in a through hole formed in an extrusion die, a preform filled in the through hole is extruded into a filling space defined between an inner surface of the through hole and an outer surface of the mandrel by pressing the preform with a pressing punch. Consequently, a cylindrical extruded form in which a plurality of stress concentration portions extending along an extruding direction are formed so as to be spaced apart from each other in a circumferential direction is formed. Then, an external force is applied to the extruded form thus obtained to thereby divide the extruded form at the stress concentration portions into a plurality of permanent magnets.

Description

technical field [0001] The present invention relates to a method of manufacturing a plurality of permanent magnets by extrusion. Background technique [0002] Formed from rare earths, iron group metals and boron, with rectangular, curved, semi-elliptical or crescent-shaped cross-sections and endowed with magnetic anisotropy by means of hot (warm) plastic working, permanent magnets have been used industrially and commercially. magnet. The manufacturing method of these permanent magnets is as follows, for example. [0003] A raw material prepared by mixing rare earths, iron-group metals, and boron is melted, and the molten magnet alloy thus obtained is sprayed onto, for example, a copper rotating roll to produce extremely rapidly quenched, composed of nano-sized grains thin ribbon. The magnet alloy powder obtained by the quenching treatment is pulverized into particles of a desired diameter, and these particles are then cold-pressed into compacts. The compact is then hot-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02B29C48/09B29C48/32B29C48/92
CPCB29K2995/0008B21C23/085B30B11/221H01F41/028B29C48/09B29C48/0022B29C48/32B29C48/92B29C2948/92704B29C48/022
Inventor 宫胁宽森田敏之篭桥达哉
Owner DAIDO STEEL CO LTD