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Method for manufacturing injection-molding rare-earth radial magnetic ring

A technology of injection molding and rare earth magnetic powder, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc.

Inactive Publication Date: 2009-10-07
BEIJING BEILILONG MAGNETIC MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a manufacturing method of injection molding rare earth radial magnetic ring, which solves the forming problem of rare earth anisotropic radial magnetic ring, overcomes the limitation of electromagnetic field and the deficiency of traditional permanent magnetic field

Method used

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  • Method for manufacturing injection-molding rare-earth radial magnetic ring
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  • Method for manufacturing injection-molding rare-earth radial magnetic ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0058] Three grades of nylon 12 were selected as the binder alone or mixed as the binder, namely nylon A, nylon B and nylon C. The characteristics are shown in Table 1.

[0059] Table I

[0060]

[0061] Description of the processing conditions of embodiment 1-5:

[0062] 1. Anisotropic rare earth magnetic powder content: 92% (by weight)

[0063] 2. Barrel temperature of the twin-screw extruder: 170°C at the feed end - 200°C at the discharge end

[0064] 3. Injection machine barrel temperature: 200-260°C

[0065] 4. Injection mold temperature: 80°C

[0066] 5. Injection pressure: 1080kg / cm 2

[0067] 6. Orientation magnetic field: 18kOe

[0068] 7. Sample size: a disc with a diameter of 12mm and a thickness of 7mm.

[0069] The data of embodiment 1-5 are shown in table two

[0070] Table II

[0071]

Embodiment 6-10

[0073] Description of embodiment 6-10 processing conditions:

[0074] 1. The traditional method of adding antioxidant: mechanically mix antioxidant powder with magnetic powder and nylon in a high-speed mixer.

[0075] 2. The traditional coupling agent addition method: Dilute the coupling agent with a solvent and mix it with magnetic powder and nylon in a high-speed mixer; mix it mechanically at a mixture temperature of 60-80°C, and remove the solvent while mixing. until the solvent is completely removed.

[0076] 3. The amount of EBS added: 0.1% of the weight of nylon

[0077] 4. Nylon: 8% of the magnetic powder weight, nylon C and nylon B each account for 50% (weight ratio)

[0078] 5. Coupling dose: 0.6% of the weight of magnetic powder

[0079] 6. The barrel temperature of the injection machine: 200-260°C.

[0080] The data of embodiment 6-10 are shown in table three

[0081] Table three

[0082]

[0083] 2. Injection molding rare earth anisotropic radiation...

Embodiment 11

[0085] Anisotropic rare-earth magnet formed by radiating an orientation magnetic field.

[0086] Using a general-purpose injection machine without an electromagnetic field device, a magnetic field orientation mold was produced by using the first orientation magnetic field method of the present invention, and the measured radiation orientation magnetic field reached 14.5KOe. An anisotropic rare-earth magnet formed by a radiation orientation magnetic field with a size of φ22.6×φ18.6×6 mm was injection-molded using the mold. Because the ring magnet formed by radiation orientation is radial 2 poles, that is, the inner surface is N pole; the outer surface is S pole, or the inner surface is S pole; the outer surface is N pole, and the magnet actually used is For multi-pole, this embodiment uses a pulse magnetization power supply with a multi-pole magnetization device to magnetize the injection-molded ring magnet into a 12-pole magnet. The magnetic flux density distribution on the ou...

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Abstract

A method for manufacturing injection-molding rare-earth radial magnetic ring belongs to the technical field of rare earth magnet preparing. The method of the invention comprises the following technical processes: mixing and drying the rare-earth magnetic powder which is coated by the coupling agent and antioxidant in negative pressure until the dissolvent and the absorbed gas is totally released, then placing the thermoplastic organic resin powder into a mixing machine for mixing to uniform in inert protective atmosphere, then placing a double-screw extruder with protective atmosphere, fully compounding the thermoplastic organic binding agent with magnetic powder, granulating for obtaining the granulate for rare-earth anisotropic bonded permanent magnet, placing the granulate into a magnetic field injector with magnetic field mold for preparing into the magnetic ring oriented along the radial direction, wherein the magnetic ring comprises radially oriented magnetic ring and multipole magnetic ring. The method of the invention has the advantage that the granulate manufactured by organic resin has excellent oxidation resistance, fluidity and magnetic characteristic. The radiating, quadrupole and multipole oriented magnetic field which is obtained by matching the permanent magnet repulsive permutation and combination and magnetic material is higher than the permanent magnetic field in which N and S are alternately permutated and combined. An energy saving effect is obtained.

Description

technical field [0001] The invention belongs to the technical field of preparing rare earth magnets, and in particular provides a method for manufacturing an injection-molded rare earth radial magnetic ring, including particles for rare earth anisotropic bonded magnets used to manufacture the rare earth anisotropic bonded magnet. The material method, the manufacturing method of the rare earth anisotropic radial orientation ring magnet injection molding using the pellets, and the magnetic field design to meet the requirements of the orientation magnetic field in the molding process of the material. technical background [0002] Rare-earth bonded magnets are manufactured by combining rare-earth magnetic powder and organic resin as a binder into magnetic powder and resin pellets according to requirements, and then molding this mixture into a magnet of the desired shape under specific conditions. The forming method Usually compression molding, injection molding and extrusion mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/053B22F1/02B22F3/00
Inventor 林崇业仝成利魏刚肖耀福郑增琨
Owner BEIJING BEILILONG MAGNETIC MATERIALS TECH
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