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NdFeB sintered magnet production method and production device, and NdFeB sintered magnet produced with said production method

A technology of sintered magnets and manufacturing methods, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems such as the decrease of the squareness of the demagnetization curve, the decrease of the magnetic properties of the squareness, the decrease of the material utilization efficiency, and the increase of the manufacturing cost, etc. Effects of residual magnetic flux density, easy handling, and inexpensive manufacturing

Inactive Publication Date: 2014-12-31
INTER METALLICS KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chips generated in the cutting process cannot be reused as magnets, which reduces the utilization efficiency of materials and increases the production cost.
In addition, the mechanical damage caused by cutting makes the squareness of the demagnetization curve (H K / H CJ ) and other problems of magnetic property degradation also exist

Method used

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  • NdFeB sintered magnet production method and production device, and NdFeB sintered magnet produced with said production method
  • NdFeB sintered magnet production method and production device, and NdFeB sintered magnet produced with said production method
  • NdFeB sintered magnet production method and production device, and NdFeB sintered magnet produced with said production method

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Embodiment

[0067] use Figure 5 and Image 6 An example of the manufacturing apparatus of the NdFeB-based sintered magnet of the present invention will be described. The basic structure of the device is figure 1 The structure is the same, but the orientation part 3 is different in that an induction heating coil 20 that heats the alloy powder 11 together with the mold 10 is provided. In the sintered magnet manufacturing apparatus of this embodiment, the mold 10 is inserted inside the induction heating coil 20, and current is supplied to the induction heating coil 20, thereby heating the alloy powder 11 together with the mold 10. Since the induction heating coil 20 is arranged on the upper part of the conveying line so that its central axis coincides with the central axis of the magnetic field applying coil 19, heating and magnetic field application can be continuously performed only by moving the lifting table 18 up and down.

[0068] In addition, the heating method is not limited to the ab...

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Abstract

Provided is a method and system for producing a slim-shaped sintered NdFeB magnet having a high level of coercive force and high degree of orientation, as well as a sintered NdFeB magnet produced by the aforementioned method or system. A system for producing a slim-shaped sintered NdFeB magnet according to the present invention includes: a filling unit 1 for supplying and filling alloy powder with a predetermined content of Dy into a mold 10 at a density within a range from 3.0 to 4.2 g / cm 3 ; an orienting unit 3 for subjecting the molds 10 holding the alloy powder 11 to an orienting process in a magnetic field; a sintering furnace (not shown) for sintering the alloy powder 11 together with the molds 10 holding the alloy powder 11 after the powder is oriented by the orienting unit 3; and a conveying unit, consisting of a belt conveyer and a manipulator (not shown), for conveying the molds 10 to any of the aforementioned units or the sintering furnace. The orienting unit 3 is provided with a heating and orienting coil 20 for heating the alloy powder 11 in the molds 10 before and / or after the application of the magnetic field so as to decrease the coercive force of the individual particles of the alloy powder 11.

Description

Technical field [0001] The present invention relates to a manufacturing method and manufacturing apparatus for manufacturing a thin-shaped NdFeB-based sintered magnet having excellent magnetic properties, particularly coercivity and orientation, and the NdFeB-based sintered magnet manufactured by the manufacturing method. Background technique [0002] The NdFeB (neodymium·iron·boron) series sintered magnet was discovered by Sagawa (the inventor of the present application) and others in 1982. It has the advantage of having magnetic characteristics far exceeding that of the permanent magnets at the time, and it can be made of Nd (A kind of rare earths), iron and boron are relatively abundant and inexpensive raw materials. Therefore, NdFeB-based sintered magnets are used in voice coil motors such as hard disks, hybrid or electric vehicles driving motors, battery-assisted bicycle motors, industrial motors, high-end speakers, headsets, permanent magnet magnetic resonance diagnosis In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02B22F1/00B22F3/00B22F3/02B22F3/10C22C33/02C22C38/00H01F1/053H01F1/08
CPCB22F3/10C22C38/06B22F2999/00H01F41/0266B22F2998/00H01F41/0273C22C38/10C22C38/16H01F1/0577B22F3/005C22C33/02C22C38/00B22F3/004B22F3/02B22F2202/05
Inventor 佐川真人沟口彻彦朝妻通康林真一
Owner INTER METALLICS KK
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