CN105268980B - The extruder grain method of soft magnetic powder - Google Patents
The extruder grain method of soft magnetic powder Download PDFInfo
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- CN105268980B CN105268980B CN201410336080.8A CN201410336080A CN105268980B CN 105268980 B CN105268980 B CN 105268980B CN 201410336080 A CN201410336080 A CN 201410336080A CN 105268980 B CN105268980 B CN 105268980B
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- soft magnetic
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Abstract
The invention discloses a kind of extruder grain method of soft magnetic powder, including：By soft magnetic powder and cohere agent solution and be mixed and stirred for uniformly；By the soft magnetic powder mixed and cohere agent solution put into a feed bin in；Carry out extruder grain；Carry out disc granulation.The characteristics of prilling powder that the method according to the invention is obtained has high apparent density, good fluidity；This method then makes powder morphology turn to nearly ellipse from strip change in the case where keeping soft state by by the combination of extruder grain and disc granulation, making powder early stage obtain the strip pattern of narrow particle size distribution in soft state by the height centrifugal motion of disk.Thus obtained powder has the good feature of narrow particle size distribution, pattern, therefore the apparent density and mobility of prilling powder are significantly improved.Specifically, apparent density >=2.0g/cm3, mobility was less than or equal to 55 seconds.
Description
Technical field
The present invention relates to the forming method of soft magnetic powder, especially a kind of prilling process of soft magnetic powder.
Background technology
Metal dust is as a kind of metal form in addition to block, band, with three-dimensional dimension is small, excellent, appearance
The characteristics of easy-formation, flexible material composition.But general metal dust can not be applied directly, and it is certain to need compressing
Profile, and product workable for could turning into by corresponding post processing.Therefore, powder need to have certain mobility and
Density could complete the process of shaping, therefore it is the powder with apparent density and mobility that metal dust, which is usually required by granulation,
End could meet technological requirement.
Common prilling process has following several：
First, mechanical crushing method
As the term suggests it is exactly the little particle for dry bulky grain being broken for the method for machinery certain particle size.This side
Metal dust prepared by method needs higher briquetting pressure, and powder morphology is typically all with jagged, and size distribution is wide, apparent density
It is bad with mobility.
2nd, extruder grain method
Extruder grain is that metal dust is forced through screen cloth on the premise of adhesive is mixed with by the strength of machinery.
Powder prepared by this method has the advantages that narrow particle size distribution, simple to operate, but its powder morphology is poor, prilling powder surface is thick
Rough, apparent density and the bad shortcoming of mobility.
3rd, disc granulation method
Metal dust is orderly put into disk by granulating disc, while there is close-burning organic liquid to make powder for sprinkling
Last random reunion is together.The advantage of disc granulation：Product pattern is subsphaeroidal, powder surface is smooth, granulating efficiency high, operation are straight
Sight, powder flowbility are good, and skewness, the powder for have the disadvantage that size distribution is wide, cohering agent content are excessive.
4th, fluidized bed comminution granulation
Feed liquid is atomized into tiny drop inside fixed fluidized bed by atomizer, drop in fluidized bed with locating
Contacted in the material of fluidised variable grain, and be attached to particle surface and complete drying-granulating process；Its advantage be will granulation,
Dry, cooling can be completed in a fluidized bed, granule size is adjustable within the specific limits in addition, and powder morphology is good, powder
Last surface is smooth, powder flowbility and the advantages of good apparent density, but its size distribution is wide, adhesive content distribution may be deposited
Uneven the problem of.
5th, spray granulation
Spray granulation is to rotate powder at a high speed with cohering to be continually fed into material by the pump housing after agent solution is mixed
Ground dispersion impeller, so that metal dust and adhesive are crushed as little particle simultaneously, it is outer when being run into by scattered compound particles
Moment is dried and shaped during portion's high-temperature gas, so as to obtain the powder with reunion shape；This method granulation efficiency is high, granulation
Powder morphology is good, smooth powder surface, powder flowbility and the advantages of good apparent density, but its size distribution is wide, diluent
The problem of consumption is big, adhesive content distribution there may be uneven.
Above existing method can not obtain the subsphaeroidal or oval prilling powder of narrow particle size distribution, pattern, be allowed in work
More or less in the presence of filling out, powder is uneven, fill out the phenomenons such as powder material leakage in industry production.
The content of the invention
It is an object of the invention to provide a kind of extruder grain method of soft magnetic powder, the apparent density of prilling powder is improved
And mobility.
In order to reach above-mentioned purpose, the present invention provides a kind of extruder grain method of soft magnetic powder, and it is used with sieve
The Squeezinggranulator and granulating disc of net, this method include step：(1) by soft magnetic powder and cohere agent solution and be mixed and stirred for
Uniformly；(2) by the soft magnetic powder mixed and cohere agent solution input feed bin；(3) extruder grain is carried out；And (4) carry out disk
Granulation.
In an aspect, method of the invention further includes the powder obtained in above-mentioned steps (3) extruder grain and received by one
The screw of material system.
Wherein, material-receiving system is, for example, inverted rescinded angle circular cone cell body, and material-receiving system is made by being placed in the motor at center
Rotary motion, makes to spin immediately motion by the first prilling powder of screen cloth.
In an aspect, disc granulation is rotary motion or centrifugal motion.
A humidifier is installed in an aspect, above granulating disc is used for make-up diluent to soft magnetic powder, so that
Adjust the soft or hard state on soft magnetic powder surface.
In an aspect, granulating disc has a disk, and this disk is in central rotation or eccentric rotary.
Wherein, the disk of granulating disc has oscillating movement simultaneously.
Wherein, the vibration of the disk of granulating disc can be simple vibration or ultrasonic vibration, or simple vibration and super
The complex vibration of acoustic vibration.
Wherein, the direction of vibration of the disk of granulating disc can be disk plane or perpendicular to disk plane.
In an aspect, the prilling powder mobility obtained by the method for the present invention is less than or equal to 55 seconds, and apparent density >=
2.0g/cm3。
The extruder grain method of the soft magnetic powder of the present invention, makes prilling powder while having the nearly ball of narrow particle size distribution, pattern
The feature of shape or ellipse, so as to fundamentally improve the apparent density and mobility of prilling powder.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Brief description of the drawings
Fig. 1 is the step flow chart of the extruder grain method of soft magnetic powder of the present invention.
Fig. 2 device systems schematic diagrames used in the extruder grain method of soft magnetic powder of the present invention.
Fig. 3 is the operational flowchart of the extruder grain method of soft magnetic powder of the present invention.
Wherein, reference：
20 Squeezinggranulators
202 screen clothes
204 fixed mechanisms
206 pressing mechanisms
208 receiving mechanisms
22 material-receiving systems
222 motors
224 air inlets
226 gas outlets
24 granulating discs
242 disks
30 materials mixed
32 first prilling powders
S10~S18 steps
Embodiment
Detailed description for the present invention and technology contents, coordinate schema to be described as follows, but institute's accompanying drawings only provide ginseng
Examine and used with explanation, not for being any limitation as to the present invention.
It refer to shown in Fig. 1, Fig. 1 is the step flow chart of the extruder grain method of soft magnetic powder of the present invention.The present invention is carried
For a kind of extruder grain method of soft magnetic powder, it uses Squeezinggranulator and granulating disc with screen cloth, this method bag
Containing step：S10, by soft magnetic powder and coheres agent solution and is mixed and stirred for uniformly；S12, by the soft magnetic powder mixed and coheres
Agent solution puts into feed bin；S14, carries out extruder grain；S16, the powder that extruder grain is obtained is transported by the spiral of a material-receiving system
It is dynamic；And S18, carry out disc granulation.
Then, Fig. 2, Fig. 2 device systems signals used in the extruder grain method of soft magnetic powder of the present invention be refer to
Figure.Device systems used in the extruder grain method of soft magnetic powder of the present invention, which are included, has Squeezinggranulator 20, material-receiving system
22 and granulating disc 24.The basic structure of Squeezinggranulator 20 by screen cloth 202 and its fixed mechanism 204, pressing mechanism 206,
Receiving mechanism 208 is constituted, and wherein screen cloth 202 and its fixed mechanism 204 are core institutions, and the specification of screen cloth 202 determines granulation
The particle size range of powder.Material-receiving system 22 is, for example, inverted rescinded angle circular cone cell body, and material-receiving system 22 is by being placed in center
Motor 222 rotates, and makes to spin immediately motion by the first prilling powder of screen cloth 202.Material-receiving system 22 can be wrapped more
Containing air inlet 224 and gas outlet 226, import gas and carry out air blowing rotating granulation.Granulating disc 24 has disk 242, disk
242 motion can be rotation or eccentric rotary even while extraneous vibration, vibration can be simple vibration or ultrasonic vibration, shake
Dynamic direction can be disk plane or perpendicular to disk plane；It may be significantly by disk post exercise prilling powder pattern
Improve, the corner angle on surface are substantially eliminated, while surface becomes smooth.
Then, Fig. 3 is refer to, Fig. 3 is the operational flowchart of the extruder grain method of soft magnetic powder of the present invention.The present invention is needed
The advantage of extruder grain and disc granulation is combined, while the shortcomings of avoiding surface material loss again, mix uneven, therefore
Need to undergo following steps：
First, a certain amount of adhesive (the generally 1.0-5.0wt% of powder weight) is weighed, and uses corresponding diluent
It is made into and coheres agent solution, amount of diluent is generally the 3.0-15.0% of powder weight, adhesive is generally organic high score
Subtree fat, such as phenolic resin, epoxy resin, polyamide and special engineering resin；Then, it would be desirable to the gold of granulation
Category powder is mixed and stirred for cohering agent solution, untill being sufficiently mixed uniformly.
In order to obtain the prilling powder of narrow particle size distribution, it is necessary to first pass through the material 30 mixed in Squeezinggranulator
Mechanical force is forced through screen cloth, and the screen cloth specification between the mesh of 20 mesh -100 can be selected as needed.Squeezinggranulator 20 it is basic
Structure is made up of screen cloth 202 and its fixed mechanism 204, pressing mechanism 206, receiving mechanism 208, wherein screen cloth and its fixed mechanism
It is core institution, the specification of screen cloth determines the particle size range of prilling powder.Specific method is first by the dilute of the material being stirred
The remaining content control of agent is released in the 1-5% of powder weight, then the material is put into Squeezinggranulator and extruder is opened
Structure, by being fallen under the first prilling powder 32 of screen cloth in material-receiving system 22.
Cuboid is generally by the first pattern of prilling powder 32, its surface has obvious corner angle, therefore to make its shape
Looks change；The present invention is reached by transforming material-receiving system 22, and specifically material-receiving system 22 is justified for inverted rescinded angle
Cell body is bored, the inverted rescinded angle circular cone cell body rotates by being placed in the motor 222 at center, made by screen cloth 202
First prilling powder 32 is spinned motion immediately, and so one side can improve the pattern of first prilling powder 32, another aspect
Prilling powder reunion can be avoided or wall is sticked；Afterwards, had by the first prilling powder 32 of screw from material-receiving system 22
Sequence throws away and fallen into the disk 242 of the high speed rotation of lower section granulating disc 24, and the motion of disk 242 can be rotation or bias
Rotation is even while extraneous vibration, vibration can be simple vibration or ultrasonic vibration, and direction of vibration can be disk plane or hang down
Directly in disk plane；Improvement is may be significantly by disk post exercise prilling powder pattern, the corner angle on surface are substantially eliminated,
Surface becomes smooth simultaneously；In this process can be according to the dry and wet degree make-up diluent of powder, specific method is by atomization
Device sprays a certain amount of diluent in disk, it is therefore an objective to soften powder surface, but can not be excessive, the powder otherwise granulated
Again can be reunited even glutinous bottom together.
Dry it powder granulated progress baking, suitable baking system is typically selected according to adhesive resin
Degree, such as 60 DEG C -80 DEG C are toasted one hour；In addition, lubricant can be added as needed on, lubricant content is generally prilling powder
The 0.1-1.0wt% of weight, lubricant can select stearic acid, stearate, paraffin etc..
Thus obtained prilling powder measures its mobility using Hall flowmeter, and funnel uses dew eye for 2mm funnel,
Its liquidity scale is：The time that 50 grams of prilling powder needs is less than or equal to 55 seconds；Obtained using apparent density tester
Data be >=2.0g/cm3。
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence
Various corresponding changes and deformation, but these corresponding changes and deformation can be made according to the present invention by knowing those skilled in the art
The protection domain of the claims in the present invention should all be belonged to.
Claims (8)
1. a kind of extruder grain method of soft magnetic powder, it is characterised in that it uses Squeezinggranulator and disk with screen cloth
Comminutor, this method includes step：
(1) by soft magnetic powder and cohere agent solution and be mixed and stirred for uniformly；
(2) by the soft magnetic powder mixed and cohere agent solution put into a feed bin in；
(3) extruder grain is carried out, the powder that extruder grain is obtained passes through the screw of a material-receiving system, and the material-receiving system is
The rescinded angle circular cone cell body put, and the material-receiving system includes air inlet and gas outlet, is made by importing gas progress air blowing rotation
Grain；And
(4) disc granulation is carried out.
2. the extruder grain method of soft magnetic powder according to claim 1, it is characterised in that the disc granulation is rotation fortune
It is dynamic.
3. the extruder grain method of soft magnetic powder according to claim 1, it is characterised in that pacify above the granulating disc
Filling a humidifier is used for make-up diluent to soft magnetic powder, so as to adjust the soft or hard state on soft magnetic powder surface.
4. the extruder grain method of soft magnetic powder according to claim 1, it is characterised in that the granulating disc has one
Disk, the disk is in central rotation or eccentric rotary.
5. the extruder grain method of soft magnetic powder according to claim 4, it is characterised in that the disk of the granulating disc
There is oscillating movement simultaneously.
6. the extruder grain method of soft magnetic powder according to claim 5, it is characterised in that the disk of the granulating disc
Vibration be ultrasonic vibration.
7. the extruder grain method of soft magnetic powder according to claim 5, it is characterised in that the disk of the granulating disc
Direction of vibration be disk plane or perpendicular to disk plane.
8. the extruder grain method of soft magnetic powder according to claim 1, it is characterised in that the granulation obtained by this method
Powder flowbility is less than or equal to 55 seconds, apparent density >=2.0g/cm3。
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| CN105268980B true CN105268980B (en) | 2017-08-04 |
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| CN105834441B (en) * | 2016-04-20 | 2017-12-01 | 昆山磁通新材料科技有限公司 | The prilling process and equipment of a kind of soft magnetic powder using electromagnetic field containment soft magnetic materials movement locus |
| CN107552777A (en) * | 2017-09-05 | 2018-01-09 | 昆山玛冀电子有限公司 | A kind of powder particle composition and production technology for inductance production |
| CN107695344A (en) * | 2017-09-08 | 2018-02-16 | 张家港创博金属科技有限公司 | Composition metal bead preparation method and device |
| CN107617736A (en) * | 2017-09-08 | 2018-01-23 | 张家港创博金属科技有限公司 | Metal-resin composite pellets preparation method and device |
| CN114082367A (en) * | 2021-11-15 | 2022-02-25 | 山东金格瑞机械有限公司 | Granulator for organic fertilizer |
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| CN1056442A (en) * | 1991-06-12 | 1991-11-27 | 湖南省化学工业设计院 | Spherical granular barium carbonate industrial production method and prilling granulator |
| JP3312931B2 (en) * | 1992-10-01 | 2002-08-12 | 株式会社アスクテクニカ | Powder granulated product and method for producing the same |
| JP4028121B2 (en) * | 1999-02-25 | 2007-12-26 | 株式会社大川原製作所 | Granulator |
| CN201006416Y (en) * | 2006-12-15 | 2008-01-16 | 刘玉忠 | Pelleting machine |
| JP5539627B2 (en) * | 2008-05-20 | 2014-07-02 | 大鵬薬品工業株式会社 | Extrusion granulator |
| CN103769596A (en) * | 2013-11-26 | 2014-05-07 | 王利民 | Method for preparing high-stacking-density oblate powder material |
| CN103768995B (en) * | 2014-01-28 | 2016-01-13 | 西安建筑科技大学 | A kind of prilling process of ultra-fine and nano soft magnetic ferrite powder |
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