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Manufacturing method of sintered magnet

A technology of sintered magnets and manufacturing methods, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., and can solve problems such as shortening the life cycle of devices, consuming energy, and deteriorating material yields

Active Publication Date: 2018-02-27
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reheating to around 900°C after once cooling to 400°C or less consumes excess energy compared to a case where reheating is not performed, and this becomes a major factor of cost increase accordingly.
[0007] In addition, by significantly changing the temperature of the sintered body, the thermal burden on the structure of the device for heating and cooling increases, which also becomes a factor that shortens the life cycle of the device and increases equipment investment costs.
In addition, as in Patent Document 1, in the method of performing cutting after the sintering process, a part of the so-called rare earth metal containing Nd or Dy contained in the sintered magnet is cut and not used in the product, and the material yield is deteriorated. class questions

Method used

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  • Manufacturing method of sintered magnet
  • Manufacturing method of sintered magnet
  • Manufacturing method of sintered magnet

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0060] figure 1 It is a flowchart showing the manufacturing method of the sintered magnet according to Embodiment 1 of the present invention. In this embodiment, the sintered magnet of the R-Fe-B system is produced through the production of an alloy as a raw material (step S1), coarse pulverization (step S2), fine pulverization (step S3), forming in a magnetic field (step S4), and sintering (step S4). Step S5), size correction (step S6), aging heat treatment (step S7), surface treatment (step S8), inspection (step S9), and magnetization (step S10).

[0061] The production of the raw material alloy is carried out by strip continuous casting or other dissolution methods in a vacuum or an inert gas environment (step S1). The sintered magnet of this embodiment uses Nd 2 Fe 14 B is the main phase, and Dy, Tb, Pr, etc. are appropriately added to Nd therein. The retention force of the sintered magnet can be improved by adding the above-mentioned rare earth metal with Nd as the ma...

Embodiment approach 2

[0105] Figure 6 (A) to (F) are schematic diagrams for explaining a method of manufacturing a sintered magnet according to Embodiment 2 of the present invention, Figure 7 It is a graph showing temperature changes when performing the sintering step, the dimension correction step, and the aging heat treatment step in the above-mentioned sintered magnet manufacturing method. in addition, Figure 8 It is a cross-sectional view showing an apparatus used in the sintering step, the dimension correction step, and the aging heat treatment step in the above-mentioned sintered magnet manufacturing method. In addition, the same code|symbol is attached|subjected to the same structure as Embodiment 1, and description is abbreviate|omitted.

[0106] In Embodiment 1, the aging heat treatment step is performed in the container of the dimension correcting unit 200 to cool the sintered magnet, but the aging heat treatment step and the cooling step may be performed as follows.

[0107] In Emb...

Embodiment approach 3

[0117] Figure 9 It is a graph showing the temperature change when performing the sintering process, the dimension correction process, and the aging heat treatment process of the manufacturing method of the sintered magnet according to Embodiment 3 of the present invention, Figure 10 It is a cross-sectional view showing an apparatus used in the sintering process, the dimension correction process, and the aging heat treatment process of the above-mentioned sintered magnet manufacturing method. In Embodiments 1 and 2, the sintering step and the dimension correction step are performed with different configurations, but the following configurations may also be employed. In addition, the schematic procedure of manufacturing the sintered magnet of Embodiment 3 is the same as figure 2 (A)~ figure 2 (D) is the same, so illustration is omitted.

[0118] In Embodiment 3, a conveyance space for the workpiece W is provided in the storage container of the dimension correction unit in...

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Abstract

The present invention provides a method for manufacturing a sintered magnet, which realizes the efficiency of the energy used in the sintering process to the aging heat treatment process, and improves the material yield. The present invention has the steps of stamping the magnet powder constituting the R-Fe-B system sintered magnet containing the rare earth element R containing Nd as the main component, and forming a green compact formed by compressing the magnet powder; The sintering process of sintering the pressed powder body under the condition of sintering temperature and forming the sintered magnet; the size correction process of correcting the size of the sintered magnet by pressing and forming the sintered magnet under the condition of heating to a temperature not exceeding the sintering temperature; using An aging heat treatment process in which the heated atmosphere generated in the dimension correction process adjusts the structure of the sintered magnet.

Description

technical field [0001] The present invention relates to a method of manufacturing sintered magnets used in high-performance motors and the like. Background technique [0002] The permanent magnets used in electric motors of hybrid vehicles are mostly Nd-Fe-B based sintered magnets, which are expected to increase in future demand due to their excellent magnetic properties. [0003] In the existing manufacturing method of Nd-Fe-B system sintered magnets, raw materials such as Nd, Fe, B are dissolved in vacuum or in argon ambient gas, and the sintered magnets are processed by jaw crusher and jet mill. The dissolved raw materials are coarsely pulverized and finely pulverized. Then, the pulverized raw material is formed into a predetermined shape in a magnetic field, sintered and heat-treated, cut and ground using a slicer or a grinder, and magnetized after surface treatment and inspection. [0004] In Patent Document 1, in order to suppress the precipitation of ferromagnetic c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02B22F3/00B22F3/24C22C33/02C22C38/00H01F1/057H01F1/08
CPCC22C38/002C22C38/005C21D1/26C21D2201/00B22F3/164B22F2998/10H01F1/0577H01F41/0293B22F3/02B22F3/10B22F2003/248B22F3/12B22F3/24B22F3/26H01F41/0266
Inventor 迫道大藤川真一郎池田明彦松苗宏树古屋崇
Owner NISSAN MOTOR CO LTD