Manufacturing method of small-size sintered NdFeB multi-pole magnetic ring

A technology of multi-pole magnetic ring and manufacturing method, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc., can solve the problems of inconvenient manufacturing, poor magnetic performance, low pressing pass rate and efficiency, and achieve pressing qualified The effects of increased efficiency, uniform magnetic ring density, improved pressing efficiency and pressing qualified rate

Active Publication Date: 2021-01-01
SINOSTEEL ANHUI TIANYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of inconvenient manufacture, poor magnetic performance, low pressing pass rate and low efficiency when manufacturing small-sized sintered NdFeB multi-pole magnetic rings by existing methods, and provides a small-sized sintered NdFeB magnetic ring. Manufacturing method of boron multipole magnetic ring

Method used

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  • Manufacturing method of small-size sintered NdFeB multi-pole magnetic ring
  • Manufacturing method of small-size sintered NdFeB multi-pole magnetic ring
  • Manufacturing method of small-size sintered NdFeB multi-pole magnetic ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]A pneumatic pressing device for making sintered NdFeB four-stage magnetic rings according to the above structure. Then make the powder with the brand name N35UH, weigh the N35UH powder with a weight of 4.0g in a closed box with an oxygen content lower than 300ppm, and press it with the pneumatic pressing device made according to the above operation. Then take out the compact according to the above operation. Then the obtained compact is subjected to isostatic pressing, high temperature sintering and tempering twice, that is, the sintering temperature is 1050°C during high temperature sintering, and the holding time is 4h; h; during the first tempering treatment, the temperature was raised to 450°C and kept for 5 hours; after the two tempering treatments were completed, a sintered NdFeB quadrupole magnetic column was obtained. Finally, the obtained multi-pole magnetic cylinder is subjected to outer circle machining, inner circle machining (casing, milling), end face grin...

Embodiment 2

[0050] A pneumatic pressing device for making sintered NdFeB four-stage magnetic rings according to the above structure. Then make the powder with the brand name N35UH, weigh a certain amount of N35UH powder in a closed box with an oxygen content of less than 300ppm, and press it with the pneumatic pressing device made according to the above operation. Then take out the compact according to the above operation. Then the obtained compact is subjected to isostatic pressing, high-temperature sintering and tempering twice, that is, the sintering temperature is 1100°C during high-temperature sintering, and the holding time is 3h; h; during the first tempering treatment, the temperature was raised to 520°C and kept for 3 hours; after the two tempering treatments were completed, a sintered NdFeB quadrupole magnetic column was obtained. Finally, the obtained multi-pole magnetic cylinder is subjected to outer circle machining, inner circle machining (casing, milling), end face grindin...

Embodiment 3

[0052] A pneumatic pressing device for making sintered NdFeB four-stage magnetic rings according to the above structure. Then make the powder with the brand name N35UH, weigh a certain amount of N35UH powder in a closed box with an oxygen content of less than 300ppm, and press it with the pneumatic pressing device made according to the above operation. Then take out the compact according to the above operation. Then the obtained compact is subjected to isostatic pressing, high temperature sintering and two tempering treatments, that is, the sintering temperature is 1080°C during high temperature sintering, and the holding time is 3.5h; the temperature is raised to 900°C during the first tempering treatment and kept 2h; during the first tempering treatment, the temperature was raised to 500°C and kept for 4h; after the two tempering treatments were completed, a sintered NdFeB quadrupole magnetic column was obtained. Finally, the obtained multi-pole magnetic cylinder is subject...

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Abstract

The invention discloses a manufacturing method of a small-size sintered NdFeB multi-pole magnetic ring, and belongs to the technical field of permanent magnet material preparation. According to the method, a pneumatic pressing device is adopted for pressing and forming sintered neodymium-iron-boron powder, then a pressed blank is taken out and subjected to isostatic pressing treatment, high-temperature sintering, tempering treatment and trepanning and grinding treatment, and the sintered NdFeB multi-pole magnetic ring is obtained. The pneumatic pressing device comprises an orientation mechanism and a pressing die, the orientation mechanism is composed of an even number of sintered NdFeB magnetic shoes which are evenly distributed in the circumferential direction at intervals, a die installation cavity is formed among the sintered NdFeB magnetic shoes in a surrounding mode, and the pressing die is correspondingly installed in the die installation cavity. By the adoption of the technicalscheme, the small-size sintered NdFeB multi-pole magnetic ring can be effectively manufactured, the manufacturing process is convenient, the equipment investment cost is low, the manufactured multi-pole magnetic ring is good in magnetic performance, and meanwhile the pressing percent of pass and the overall efficiency of the multi-pole magnetic ring are improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet material preparation, and more specifically, designs a method for manufacturing a small-sized sintered NdFeB multi-pole magnetic ring. Background technique [0002] Sintered NdFeB multi-pole magnetic ring is a new product developed in recent years. It is a new direction for the development of sintered NdFeB permanent magnet materials. It is mainly used in high-performance permanent magnet motors and sensors. It has high precision, stable operation and Low noise and other advantages, it is the first choice for high-speed, high-precision control motors, and is widely used in high-speed drive motors, servo motors and other industrial equipment automation, digital, intelligent equipment and other fields. [0003] Sintered NdFeB multi-pole magnetic ring has the following advantages compared with the traditional magnetic ring spliced ​​by multi-tile-shaped magnetic blocks: its overall magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0253H01F41/0266H01F1/0576H01F1/0577
Inventor 孙红军周军宋伟刘军聂明王立异
Owner SINOSTEEL ANHUI TIANYUAN TECH
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