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Flow channel device capable of extruding out a plurality of magnets once for extruding machine and preparation method using same

An extrusion molding machine and flow channel technology, applied in the direction of magnetism of inorganic materials, can solve the problems of uneven magnet density, uneven density, component segregation, etc., easy to achieve size and shape tolerance, good central symmetry, density easy consistent effect

Active Publication Date: 2009-08-26
BEIJING ZHONG KE SAN HUAN HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compression-molded bonded NdFeB magnets have the following disadvantages: limited in pressing height, for example, thin-walled (1mm) ring magnets are difficult to prepare when the height is greater than 10mm, the density of the magnet is not uniform, and the shape of the magnet has a certain Deformation, large taper after magnet forming, etc.; injection-molded bonded NdFeB magnets have lower magnetic properties than compression-molded ones
However, the production efficiency of extrusion molding is very low. Usually, a machine can only be equipped with one extrusion port. One of the ways to improve production efficiency is to extrude multiple pieces of magnets at a time.
[0005] Chinese Patent No. ZL96119267.4, the name of the invention is "Rare Earth Bonded Magnet and Rare Earth Bonded Magnet Composition", Chinese Patent No. ZL 961119416, the name of the invention is "Rare Earth Bonded Magnet and Rare Earth Magnet Composition", Both give the composition of extrusion bonded NdFeB and the general preparation method, but do not involve the preparation technical conditions of extruding multiple pieces of bonded NdFeB at one time
However, for a set of bonded NdFeB magnets with multiple pieces, its application requires high dimensional accuracy, consistent density, and no segregation of components, so one extrusion of multiple pieces of bonded NdFeB magnets and plastics Multi-piece extrusion techniques vary widely
In addition, since the magnetic powder in the magnet raw material contains more than 85% and only a small amount of binder (nylon, resin, etc.), the density difference between the magnetic powder and the binder is about 6 times, and the extrusion process may cause component segregation or uneven density. Therefore, The multi-piece bonded NdFeB magnet extrusion technology in one set of equipment is more stringent in the control of process parameters

Method used

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  • Flow channel device capable of extruding out a plurality of magnets once for extruding machine and preparation method using same
  • Flow channel device capable of extruding out a plurality of magnets once for extruding machine and preparation method using same
  • Flow channel device capable of extruding out a plurality of magnets once for extruding machine and preparation method using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] The NdFeB magnetic powder used in the magnet accounts for 84 wt%, the ferrite magnetic powder accounts for 1 wt%, and the binder PPS accounts for 15 wt%. After uniform mixing and kneading, it is made into kneading powder. Using the extrusion flow channel device of the present invention, under the conditions of temperature, extrusion speed and extrusion pressure of each flow channel of the extrusion device shown in Table 2, one-time extrusion molding was performed to obtain multiple pieces of magnets.

[0092] Table 2

[0093] parts

Main hot runner 6

Sub-hot runner 7 front

(near main road)

Sub-hot runner 7 rear

(near exit)

Formed

magnet 4

temperature(°C)

310～320

290～300

250～260

≤135

Extrusion speed(mm / s)

3～4

5～6

5～6

5～6

Extrusion pressure (MPa)

≥10

≥8

≥7

-

[0094] The texture of each point of the obtained tile-shape...

Embodiment 2

[0097] The NdFeB magnetic powder used in the magnet accounts for 96 wt% of the total weight, and the polyamide resin accounts for 4 wt% of the total weight. After uniform mixing and kneading, it is made into kneading powder. Using the extrusion flow channel device of the present invention, under the conditions of temperature, extrusion speed and extrusion pressure of each flow channel of the extrusion device shown in Table 3, one-time extrusion molding was performed to obtain multiple pieces of magnets.

[0098] table 3

[0099] parts

Main hot runner 6

Sub-hot runner 7 front

(near main road)

Sub-hot runner 7 rear

(near exit)

Formed

magnet 4

temperature(°C)

240～243

220～230

135～145

≤135

Extrusion speed(mm / s)

2～3

4～5

4～5

4～5

Extrusion pressure (MPa)

≥10

≥9

≥6

-

[0100] The texture of each point of the obtained fan-shaped long bar magnet is un...

Embodiment 3

[0103] The NdFeB magnetic powder used in the magnet accounts for 22 wt%, the ferrite magnetic powder accounts for 70 wt%, and the polyamide resin accounts for 8.0 wt%. After uniform mixing and kneading, it is made into kneading powder. Using the extrusion flow channel device of the present invention, under the conditions of the temperature, extrusion speed and extrusion pressure of each flow channel of the extrusion device shown in Table 4, one-time extrusion molding was performed to obtain multiple pieces of magnets.

[0104] Table 4

[0105] parts

[0106] The texture of each point of the obtained ring-shaped magnet is uniform, so the magnetic performance is very uniform, and the size meets the requirements of the drawing. The obtained ring-shaped magnet is as follows Figure 5 As mentioned above, wherein, the outer diameter φ51=17.30±0.05mm, the inner diameter φ52=15.30±0.05mm, the roundness of the outer circular surface is 0.025mm, the coaxiality of the outer ci...

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Abstract

The invention provides a flow channel device capable of extruding out a plurality of rare earth magnets once for an extruding machine, and a method for preparing the plurality of the rare earth magnets extruded out once by the extruding flow channel device. The flow channel device comprises a device main body (1), a core rod (2), a cooling pipe (3), a cooler (5), a main heat flow channel (6), a plurality of branched heat flow channels (7), temperature sensors (8) and (12), and a mixing material inlet (9). The flow channel device can efficiently obtain novel rare earth magnets which have even texture, uniform magnetic property, high dimension precision in the length direction and good corrosion resistance without conicity and needle eyes.

Description

technical field [0001] The invention relates to a channel device for extruding multiple pieces of rare earth magnets at one time for an extrusion molding machine, and a method for preparing multiple rare earth magnets at one time by using the extrusion channel device. Background technique [0002] One of the main application fields of permanent magnet materials is motors. In the structure of most micro motors, the permanent magnets are in the shape of rings or tiles. The gap between the permanent magnets and the rotor is very small, 0.10-0.15mm or even smaller. It is accumulated by permanent magnet tolerance, rotor tolerance, assembly tolerance, etc. The large tolerance of the magnet or the taper in the length direction will directly affect the change of the gap size, thereby affecting the strength and reasonable distribution of the gap magnetic field, causing the motor to run unstable, and there are many technical problems such as noise and vibration. Therefore, in additio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/20H01F1/06
Inventor 魏强周兆暖卢冯昕饶晓雷陈玮
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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