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Orientation forming process of anisotropic rubber composite rare earth permanent magnet

An anisotropic, composite rare earth technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as low orientation, poor orientation effect, and low magnetic properties of NdFeB

Active Publication Date: 2022-02-08
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnetic properties of traditional rubber NdFeB are low, and the maximum magnetic energy product is lower than 9MGOe, generally 3-7MGOe, and the magnetic properties cannot meet the needs of high-end customers.
[0005] patent application CN201110152832.1 discloses a calendered anisotropic flexible rare-earth bonded magnet and its manufacturing method. In this method, anisotropic rare-earth composite permanent magnet powder is first , adhesives, and processing aids are evenly mixed and crushed, and calendered. This molding method mainly adopts the stress field orientation of calendering double-roller pressing. The orientation effect is poor, and the orientation degree is low, far inferior to the magnetic field orientation.

Method used

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  • Orientation forming process of anisotropic rubber composite rare earth permanent magnet
  • Orientation forming process of anisotropic rubber composite rare earth permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Select 92 parts of anisotropic SmFeN powder with a magnetic energy product of 35MGOe, 4 parts of CPE, 3 parts of EVA, 0.3 part of antioxidant (RD), and 0.7 part of plasticizer (soybean oil). Put the material into the banbury mixer for banburying, the banburying temperature is 115°C, and the banburying time is 25 minutes. After the banburying is completed, the material is poured out and crushed into φ3mm pellets. Orientation molding process: 1. Equipment preheating, first stage temperature: 80°C, second stage temperature: 125°C, third stage temperature: 135°C; 2. After the equipment is preheated, put the crushed pellets into the hopper , turn on the extruder, set the speed at 300 rpm, and push the pellets into the die through the screw; 3. Turn on the electromagnet to generate a 1.5 (T) Tesla electromagnetic field, and the upper and lower magnetic poles of the magnetic head are N, S pole, when the heated material passes through the die with a magnetic field, it is arrange...

Embodiment 2

[0038] The difference from Example 1 is that the formula and process conditions have been adjusted. Specifically, 94 parts of anisotropic SmFeN powder with a magnetic energy product of 35MGOe, 5.2 parts of nitrile rubber, 0.2 parts of vulcanizing agent (DCP), 0.2 parts of antioxidant (RD), and 0.4 parts of plasticizer (soybean oil) were selected. Put the material into the banbury mixer for banburying, the banburying temperature is 135°C, and the banburying time is 30 minutes. After the banburying is completed, the material is poured out and crushed into φ3mm pellets. Orientation molding process: 1. Equipment preheating, first stage temperature: 95°C, second stage temperature: 130°C, third stage temperature: 145°C; 2. After equipment preheating, put the crushed pellets into the hopper , turn on the extruder, set the speed at 150 rpm, and push the pellets into the die through the screw; 3. Turn on the electromagnet to generate a 1.5 (T) Tesla electromagnetic field, and the upper...

Embodiment 3

[0040] The difference from Embodiment 1 is that the intensity of the orientation magnetic field is increased to 2.5 (T) Tesla.

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Abstract

The invention belongs to the technical field of magnetic materials, and discloses an orientation forming process of an anisotropic rubber composite rare earth permanent magnet. The orientation forming process of an anisotropic rubber composite rare earth permanent magnet comprises the following steps: (1) uniformly mixing a binder, an auxiliary material and magnetic powder through a banburying process, and crushing the mixed material into particles or powder by using crushing equipment; (2) carrying out extrusion molding on the crushed material by using an extruder, wherein the molding process flow comprises the following steps: 1, preheating equipment; 2, adding the crushed materials into a hopper after equipment preheating, starting the extruder, and arranging the heated materials in order according to the direction of a magnetic field when the heated materials pass through a mouth mold with a magnetic field so as to realize the orientation purpose and to obtain a magnetic strip; and 3, cooling and forming the oriented magnetic strip through a heat insulation piece and a cooling guide mold. According to the process, after particles are heated and softened, the magnetic field is applied for arrangement orientation forming, and the flexible rubber composite rare earth permanent magnet with the maximum magnetic energy product larger than 10 MGOe can be prepared.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to an anisotropic rubber composite rare earth permanent magnet orientation molding process. Background technique [0002] The rubber composite rare earth permanent magnet is prepared by using rare earth permanent magnet powder, thermoplastic rubber and a small amount of processing aids through calendering, extrusion and other processes. Its processing technology is simple and easy to shape. Because it can be prepared into sheets, strips, rings and other complex shapes to meet different requirements, it can be widely used in micro-motors, refrigerator door seals, toys, stationery, advertising and other industries. [0003] At present, most of the flexible rubber compound rare earth permanent magnet products on the market are isotropic, and their maximum magnetic energy product is generally lower than 10MGOe, so the application is limited. Although injection molding rare e...

Claims

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Application Information

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IPC IPC(8): H01F41/02
CPCH01F41/0253H01F41/0266H01F41/0273
Inventor 杜军杰赵宇航曹江
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD