CN106199468A - A kind of evaluation methodology of bonded permanent ferrite magnetic powder magnetic characteristic - Google Patents
A kind of evaluation methodology of bonded permanent ferrite magnetic powder magnetic characteristic Download PDFInfo
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- CN106199468A CN106199468A CN201610576502.8A CN201610576502A CN106199468A CN 106199468 A CN106199468 A CN 106199468A CN 201610576502 A CN201610576502 A CN 201610576502A CN 106199468 A CN106199468 A CN 106199468A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
Abstract
The present invention relates to the evaluation methodology of a kind of bonded permanent ferrite magnetic powder magnetic characteristic, it is characterized in that, the step of described evaluation methodology includes: in the device being used for manufacturing multipole magnet assembly, bonded permanent ferrite magnetic powder is shaped to multipole magnet assembly, is evaluated the magnetic characteristic of described bonded permanent ferrite magnetic powder by the magnetic characteristic measuring described multipole magnet assembly；Wherein, the described device for manufacturing multipole magnet assembly includes at least two orientation magnet being distributed on the circular base formed by non-magnet material, and described at least two orientation magnet multipole magnet assembly in making circular base on described circular base in a fixed manner forms many magnetic poles characteristic in magnetic field.Bonded permanent ferrite magnetic powder is injection molded into many pole piece and comes test surfaces magnetic field and magnetic flux by the present invention, evaluates magnetic characteristic by Surface field and magnetic flux, and evaluation result more accurately with effectively, meets producer's Surface field to magnetic powder and the understanding demand of magnetic flux.
Description
Technical field
The present invention relates to the technical field of bonded permanent ferrite magnetic powder, particularly relate to a kind of bonded permanent ferrite magnetic powder
The evaluation methodology of magnetic characteristic.
Background technology
Within 1933, add rattan and Wu Jing have developed the Conjugate ferrite of cubic system, open the research of permanent-magnet ferrite oxide
Prelude, Barium hexaferrite and strontium ferrite are come out one after another subsequently, and permanent-magnet ferrite material has become each commercial production neck even to this day
Indispensable basic material in territory.Permanent-magnet ferrite can be divided into sintering permanent magnet and bonded permanent magnet according to moulding process at present,
The former uses prior powder metallurgy technique to prepare, and the latter uses calendering or injection molding process to prepare.
Bonded permanent magnet be magnetic powder is mixed homogeneously by a certain percentage with binding agent and other additive after, take suitably to become
Shape technique and a kind of composite of preparing.It has the feature of magnet and plastics concurrently, can use the process equipment of common plastics
Shape with manufacturing process.Compared with sintered magnet, although bonded permanent magnet magnetic property is low, poor heat resistance, but it has following excellent
Point:
(1). product processing method is many: as rolled, extrude, inject, molding；
(2). shape of product degree of freedom is big: as ring, post, sheet, block, watt and other various complicated shapes；
(3). product size precision is high, it is not necessary to secondary operations；
(4). joint product can be made with other component global formation；
(5). technique is simple, can high-volume automated production, efficiency is high；
(6). finished product rate is high, up to about 95%；
(7). product machining property is good, assembles easily, is not susceptible to fracture and desquamation phenomenon；
(8). by adjusting the ratio of magnetic powder and binding agent, may be manufactured without the product of same physicochemical property.
Being based on above-mentioned advantage, in recent years, bonded permanent magnet is developed rapidly.
Injection moulding is a kind of important binding electromagnetic material forming method.
Injection moulding be magnetic powder, binding agent and auxiliary agent are mixed by a certain percentage after, prepare particulate material through mixing and pelletize,
Then shape at certain technological parameter hemostasis, after cooling, i.e. obtain product.
During injection moulding, particulate material is in molten condition, and its mobility is fine, has the magnetic powder of uniaxial anisotropy
Easily rotate under the effect of alignment magnetic field, thus injection technique compares and suitably forms anisotropic bonded magnet.
Although injection binding magnet magnetic property is low compared with molding bonded permanent magnet, but its production efficiency is high, shape of product degree of freedom
Greatly.Further, since the binder content big (volume fraction is more than 30%) added, define adhesive film in magnet surface,
Improve the corrosion resistance of magnet, typically can not carry out surface anticorrosion process.
Magnetic powder is the key factor determining injection moulding magnet magnetic property, and the evaluation of magnetic powder magnetic characteristic needs effective test
And evaluation methodology.At present, magnetic powder is mainly mixed homogeneously by the methods of testing and evaluating of injecting ferrite magnetic powder with bonding agent, logical
Cross double screw extruder pelletize ferrite pellet, use this pellet injection mo(u)lding ferrite cylinder on magnetic field orientating forming machine,
The test remanent magnetism (Br) of cylindrical sample, magnetic strength coercivity (Hcb), in grasp coercivity (Hcj), maximum magnetic energy product (BH) max, different
Magnetic powder all uses same recipe and technique to prepare cylindrical laboratory block, and aforementioned four indices characterizes Magnetic Properties of Magnetic.
But, during producing and using, Magnet manufacturer focuses more on table field and the magnetic flux of device, passes
Unified test method for testing test four performance indications (remanent magnetism (Br), magnetic strength coercivity (Hcb), in grasp coercivity (Hcj), maximum magnetic flux
Energy product (BH) max) although the table field of device is had a certain impact, but device table field influence factor is numerous, does not exist accurately
Corresponding relation, even it sometimes appear that four performance indications of magnetic powder injection standard sample are more or less the same, but the table of resulting devices
Field and magnetic flux but differ greatly, and the method for the most existing sign magnetic powder exists certain limitation.
The difference that actual product and test sample exist between sample shape test parameter is as shown in table 1:
Table 1: existing sample and the difference of multipole device
| Alignment magnetic field/Gs | Device | Test parameter | |
| Test standard specimen | ＞ 9000 | The two poles of the earth cylinder | Br、Hcb、Hcj、(BH)max |
| Multipole device | 1500～3000 | Multi-pole magnet-ring | Surface field, magnetic flux |
Both alignment magnetic field differences, test standard specimen uses solenoid orientation, and alignment magnetic field is high, reaches 9000Gs, magnetic powder
Almost it is fully oriented, and multipole device is affected by die space, use permanent magnetism orientation, the relatively low (1500-of alignment magnetic field
3000Gs), magnetic powder orientation is low, causes the magnetic property of magnetic powder to be brought into play the most completely.Particularly with magnetic powder body in detection formula
Fraction is higher, such as more than 2.0MGOe formula, the difference that two kinds of method of testings are brought becomes apparent from.
The invention provides the evaluation methodology of a kind of bonded permanent magnet oxysome magnetic powder magnetic characteristic, entered by test table field and magnetic flux
And characterize magnetic powder magnetic characteristic, compensate for the deficiency of tradition magnetic characteristic evaluation methodology, there is bigger practical characteristic.
Chinese patent (CN 103930775 A) discloses a kind of magnetic evaluation methodology, uses magnetic evaluating apparatus
Evaluating magnet, this magnetic evaluating apparatus has: magnet exciting coil, and it produces the magnetic field of the range size being equivalent to region below,
This region at least include a magnetic sheet in the above-mentioned magnet that multiple magnetic sheets are engaged by insulant and this magnetic sheet with
The adjacent insulant between other magnetic sheet；And detection coil, its coil diameter than an above-mentioned magnetic sheet at above-mentioned magnetic sheet
Length in orientation is little, and this magnetic evaluation methodology is characterised by, comprises the following steps: produce according in above-mentioned magnet
The relation of vortex flow and caloric value obtain the threshold value of vortex flow amount in advance；And above-mentioned magnet is applied by above-mentioned magnet exciting coil
The magnetic field produced, is judged as defective in the case of the vortex flow amount gone out by above-mentioned detection Coil Detector exceedes above-mentioned threshold value.
Although this patent can evaluate magnetic field and the magnetic of magnetic, but can not the Surface field that formed of effective evaluation magnetic powder and magnetic
Logical.
Summary of the invention
For the deficiency of prior art, the present invention provides the evaluation methodology of a kind of bonded permanent ferrite magnetic powder magnetic characteristic,
It is characterized in that, the step of described evaluation methodology includes:
Bonded permanent ferrite magnetic powder is shaped to multipole magnet assembly in the device being used for manufacturing multipole magnet assembly,
The magnetic characteristic of described bonded permanent ferrite magnetic powder is evaluated by the magnetic characteristic measuring described multipole magnet assembly；Its
In,
The described device for manufacturing multipole magnet assembly includes being distributed on the circular base formed by non-magnet material
At least two orientation magnet, described at least two orientation magnet is for making circular base in a fixed manner on described circular base
Multipole magnet assembly in Zuo forms many magnetic poles characteristic in magnetic field.
According to a preferred implementation, there is the described bonded permanent ferrite magnetic powder of uniaxial anisotropy with molten state
Be injected in the injection molding in described circular base, and under the influence of a magnetic field rotational forming for having many magnetic poles characteristic
Multipole magnet assembly.
According to a preferred implementation, the melt temperature of described bonded permanent ferrite magnetic powder is 250 DEG C～300 DEG C,
Wherein, described bonded permanent ferrite magnetic powder heating-up temperature of five parts through injection device during injection moulding depends on
Secondary it is: 260 DEG C, 270 DEG C, 280 DEG C, 290 DEG C, 300 DEG C.
A kind of device for manufacturing multipole magnet assembly, it is characterised in that described device includes being distributed in by non-magnetic material
At least two orientation magnet on the circular base of the hollow that material is formed, described at least two orientation magnet is in described annular
The multipole magnet assembly in circular base is made to form many magnetic poles characteristic, described circular base in magnetic field on pedestal in a fixed manner
At least two it is provided with for being detachably secured the screens of described alignment magnetic field outside Zuo.
According to a preferred implementation, orientation magnet described at least two in equidistant mode uniformly in radiation point
Cloth is in the screens of described circular base.
According to a preferred implementation, being unevenly distributed of described orientation magnet, described orientation magnet is not according to
The uniform regularity of distribution is fixed in the screens of described circular base.
According to a preferred implementation, described circular base includes circular rings pedestal, straight-flanked ring pedestal or regular polygon
Ring group seat.
A kind of multipole magnet assembly, it is characterised in that described multipole magnet assembly is made being used for by bonded permanent ferrite magnetic powder
Make molding in the injection molding of multipole magnet assembly, evaluate described bonded permanent magnet by the magnetic characteristic measuring described multipole magnet assembly
The magnetic characteristic of ferromagnetic oxide powder；Wherein,
Integrated described multipole magnet assembly includes that the first annulus that concentric arranges, interior diameter are more than described first circle
Second annulus of ring overall diameter and at least two connect the first annulus and the spoke of the second annulus, and the height of described first annulus is big
Height in described second annulus.
According to a preferred implementation, described spoke is that the elongated central line of radiation profiles and described spoke converges at institute
State a bit on the axle center of the first annulus；Or
Described spoke is the axle center that the elongated central line of radiation profiles and described spoke does not converge at described first annulus；Or
Person
Described spoke is that the mode of identical angle is equal according to elongated central line and the tangent line of described first annulus overall diameter
Even it is distributed between described first annulus and described second annulus.
According to a preferred implementation, described first annulus of described multipole magnet assembly and described second annulus crosscutting
Face is the annular of plane, and described spoke includes circular bar, rectangular strip and/or polygon bar, and described circular bar also includes isometrical
Bar and reducing bar.
The Advantageous Effects of the present invention:
Bonded permanent ferrite magnetic powder is injection molded into multipole magnet assembly and comes test surfaces magnetic field and magnetic flux by the present invention, logical
Crossing Surface field and magnetic flux and evaluate magnetic characteristic, evaluation result more accurately and effectively, meets producer to the Surface field of magnetic powder and magnetic
Logical understanding demand.The present invention can accurate evaluation bonded permanent ferrite magnetic powder magnetic characteristic, for magnetic powder prepare high-performance bonding
Permanent magnetic ferrite magnetic powder provides fast and convenient detection method.
Accompanying drawing explanation
Fig. 1 is the logical schematic of the evaluation methodology of the present invention；
Fig. 2 is the schematic top plan view of the ten six types of severe debility disease magnet ring devices of the present invention；
Fig. 3 is the longitudinal surface schematic diagram of the ten six types of severe debility disease magnet ring devices of the present invention；
Fig. 4 is the schematic diagram of the device for manufacturing multipole magnet assembly of the present invention；
Fig. 5 is the schematic diagram of the magnetic flux test fixture of the present invention；With
Fig. 6 is the ten six types of severe debility disease magnet ring table curve of field distribution figures of the present invention.
Accompanying drawing mark and list
1: orientation magnet 2: ten six types of severe debility disease magnet ring 3: circular rings pedestal
Detailed description of the invention
It is described in detail below in conjunction with the accompanying drawings.
After permanent magnet material refers to be magnetized by externally-applied magnetic field, remove external magnetic field, remain to retain a more ferromagnetic class material.
The magnetic characteristic of the present invention refers to magnetic flux and Surface field.
In the case of testing conditions is identical, the H of magnetic materialcjMeet threshold value requirement, general test magnetic flux and table
Field is the highest, it is meant that magnetic particle capability is preferable.Therefore, the present invention is by measuring by the multipole magnetic of bonded permanent ferrite magnetic powder molding
The magnetic characteristic of parts evaluates the magnetic characteristic of bonded permanent ferrite magnetic powder.
Multipole magnet assembly in the present invention, refers to the magnetic pole number of poles magnetic part more than 1.
Orientation magnet in the present invention, refers to have magnetic bar-shaped magnet.One end of orientation magnet is S pole, and one end is N
Pole.Orientation magnet can be the bar-shaped magnet of rectangle, it is also possible to be columned magnet.Orientation magnet can be solid magnet,
Can also be center be empty hollow magnet.
The present invention provides the evaluation methodology of a kind of bonded permanent ferrite magnetic powder magnetic characteristic, it is characterised in that evaluation methodology
Step include:
Bonded permanent ferrite magnetic powder is shaped to multipole magnet assembly in the device being used for manufacturing multipole magnet assembly,
The magnetic characteristic of bonded permanent ferrite magnetic powder is evaluated by the magnetic characteristic measuring multipole magnet assembly；Wherein,
Include being distributed on the circular base formed by non-magnet material at least for manufacturing the device of multipole magnet assembly
Two orientation magnets, at least two orientation magnet multipole magnetic in making circular base on circular base in a fixed manner
Parts form many magnetic poles characteristic in magnetic field.As it is shown in figure 1, the evaluation of the bonded permanent ferrite magnetic powder magnetic characteristic of the present invention
Method includes:
S1: bonded permanent ferrite magnetic powder is shaped to multipole magnet assembly in the device being used for manufacturing multipole magnet assembly.
S2: evaluated the magnetic characteristic of bonded permanent ferrite magnetic powder by the magnetic characteristic measuring multipole magnet assembly.
Bonded permanent ferrite magnetic powder is shaped in the device being used for manufacturing multipole magnet assembly the step of multipole magnet assembly
Suddenly include:
S11: surface treated permanent magnetic ferrite magnetic powder and binding agent are mixed to form bonded permanent ferrite magnetic powder.
Specifically, surface treated permanent magnetic ferrite magnetic powder and binding agent are mixed to form bonded permanent ferrite magnetic
The step of powder includes:
KH-590 coupling agent dehydrated alcohol is diluted to the standard solution that concentration is 10%,
It is dried 2 hours in 100 DEG C of drying baker after permanent magnetic ferrite magnetic powder is mixed with standard solution.
Surface treated permanent magnetic ferrite magnetic powder forms bonded permanent ferrite with lubricant, binding agent mixed at high speed
Magnetic powder, permanent magnetic ferrite magnetic powder is 100: 12: 1 with lubricant, the mixed proportion of binding agent.
S12: bonded permanent ferrite magnetic powder is carried out mixing granulator at high operating temperatures thus forms bonded permanent oxygen
Body magnetic powder particle.
Use torque rheometer that bonded permanent ferrite magnetic powder is carried out extruding pelletization.Preferably, bonded permanent ferrite
It is 200 DEG C～250 DEG C that magnetic powder carries out the high-temperature temperature of mixing granulator.Wherein, bonded permanent ferrite magnetic powder carries out mixing granulator
During be followed successively by through the heating-up temperature of five parts of granulation apparatus: 210 DEG C, 240 DEG C, 240 DEG C, 240 DEG C, 220 DEG C.This
In invention, the extruding pelletization rotating speed in torque rheometer granulation process is 190 revs/min.During mixing granulator, record is also
Monitoring moment of torsion, extrusion pressure, parameter the normally forming with guarantee bonded permanent ferrite granule of material temperature process.
S13: the bonded permanent ferrite magnetic powder particle with uniaxial anisotropy is injected in circular base with molten state
Injection molding in, and rotational forming is the multipole magnet assembly with many magnetic poles characteristic under the influence of a magnetic field.
Bonded permanent ferrite magnetic powder particle is melted temperature 270 DEG C, and it is molten to test bonded permanent ferrite magnetic powder
Melt the melt index values of state.
Bonded permanent ferrite magnetic powder particle is injected into molten state the injection molding being arranged in circular base and becomes
Type, so that the bonded permanent ferrite magnetic powder with uniaxial anisotropy rotates under the effect of alignment magnetic field and becomes
Type.
Preferably, the injection temperature of bonded permanent ferrite magnetic powder particle is 250 DEG C～300 DEG C.Wherein, bonded permanent
Oxysome magnetic powder particle heating-up temperature of five parts through injection device during injection moulding is followed successively by: 260 DEG C, 270
℃、280℃、290℃、300℃。
The hollow formed by non-magnet material for the device that manufacture multipole magnet assembly including be distributed in the present invention
At least two orientation magnet on circular base.At least two orientation magnet is for making ring in a fixed manner on circular base
Multipole magnet assembly in shape pedestal forms many magnetic poles characteristic in magnetic field.Be provided with outside circular base at least two for
The screens in dismountable mode fixed orientation magnetic field.Circular base includes circular rings pedestal, straight-flanked ring pedestal or regular polygon ring
Pedestal.
According to a preferred implementation, orientation magnet can be to be evenly distributed on circular base.Orientation magnet it
Between distance be equal.Such as, orientation magnet is evenly distributed in the screens of round base.
According to a preferred implementation, the distribution of orientation magnet can be uneven.Orientation magnet can be according to not
The uniform regularity of distribution is fixed in the screens of circular base.Such as, the pole pitch between the magnetic pole of two orientation magnets includes
Distance A and distance B.Orientation magnet is according to the rule distribution that pole pitch is ABAB.
The multipole magnet assembly of the present invention is multi-pole magnet-ring.Multi-pole magnet-ring by bonded permanent ferrite magnetic powder be used for manufacturing many
Molding in the device of pole magnet assembly, the magnetic being evaluated bonded permanent ferrite magnetic powder by the magnetic characteristic measuring multipole magnet assembly is special
Property.Multi-pole magnet-ring includes that the first annulus that concentric arranges, interior diameter are more than the second annulus of the first annulus overall diameter and at least
Two connect the first annulus and the spoke of the second annulus.The height of the first annulus is more than the height of the second annulus.
After multipole magnet assembly molding, need to detect the magnetic characteristic of multipole magnet assembly.The parameter of magnetic characteristic that the present invention measures
Including Surface field parameter and magnetic flux parameter.The present invention is come by the Surface field parameter and magnetic flux parameter evaluating multipole magnet assembly
Evaluate the magnetic characteristic of bonded permanent ferrite magnetic powder.
Measure the magnetic flux parameter of multipole magnet assembly.Multi-pole magnet-ring is arranged on the center of magnetic flux test fixture.At least
Two test poles centered by multi-pole magnet-ring in radiation profiles.Test pole is wound around and phase according to right-hand rule by insulated conductor
The winding direction of the insulated conductor of adjacent test pole is contrary, seals magnetic flux test fixture and carries out magnetic flux test, obtaining multipole magnetic portion
The magnetic flux parameter of part.
Measure the Surface field parameter of multipole magnet assembly.Use the Surface field compartment system surface magnetic to multipole magnetic device
Field measures, and obtains the Surface field parameter of multipole magnet assembly.
The present invention chooses at least one permanent magnetic ferrite magnetic powder and uses the evaluation methodology of the present invention to make standard multipole magnetic portion
Part sample, and measure remanent magnetism (Br) parameter, magnetic strength coercivity (Hcb) parameter, in grasp coercivity (Hcj) parameter, maximum magnetic energy
Long-pending (BH) max) parameter.The alignment magnetic field of standard multipole magnet assembly sample is 9000Gs, four of evaluation criterion multipole magnet assembly
Parameter comparative result.
The magnetic characteristic evaluation methodology of the present invention and traditional foundation quadrinomial parameter remanent magnetism (Br) parameter, magnetic strength coercivity
(Hcb) parameter, in grasp coercivity (Hcj) parameter, maximum magnetic energy product (BH) max) result difference of the magnetic characteristic method of parameter is relatively
Greatly.The present invention is accurate to the magnetic flux of bonded permanent ferrite magnetic powder magnetic characteristic and the evaluation comparison of Surface field.
Embodiment 1
The present embodiment is to further illustrate the present invention.
The present embodiment is evaluated bonding by measuring by the magnetic characteristic of ten six types of severe debility disease magnet rings of bonded permanent oxygen magnetic powder molding
Permanent magnetic ferrite magnetic powder magnetic characteristic.The present embodiment is not limited to ten six types of severe debility disease magnet rings, applies also for other multipole magnet assemblies.
First, surface treated permanent magnetic ferrite magnetic powder and binding agent are mixed to form bonded permanent ferrite magnetic
Powder.
Permanent magnetic ferrite magnetic powder is carried out surface process.Use silane coupler KH-590 that ferromagnetic oxide powder is carried out surface
Process.Preferably, weigh 1kg permanent magnetic ferrite magnetic powder, 10ml KH-590 coupling agent dehydrated alcohol is diluted to the mark of 10%
Quasi-solution；Permanent magnetic ferrite magnetic powder is mixed homogeneously with standard solution, and mixed solution is placed in 100 DEG C of drying baker dry
Dry 2 hours stand-by.
Surface treated permanent magnetic ferrite magnetic powder and binding agent are mixed to form bonded permanent ferrite magnetic powder.Preferably
Ground, surface treated permanent magnetic ferrite magnetic powder forms bonded permanent ferrite magnetic powder with lubricant, binding agent mixed at high speed.
Permanent magnetic ferrite magnetic powder is 100: 12: 1 with lubricant, the mixed proportion of binding agent.Preferably, 1kg surface is handled well forever
Magnetic ferrites magnetic powder, 120g nylon 12,10g stearic acid amide lubricant mix homogeneously in high-speed mixer, form bonding forever
Magnetic ferrites magnetic powder.
Bonded permanent ferrite magnetic powder is carried out mixing granulator at high operating temperatures thus forms bonded permanent ferrite magnetic
Powder particles.
Specifically, select torque rheometer that bonded permanent ferrite magnetic powder carries out mixing granulator, form bonded permanent
Oxysome magnetic powder particle.During mixing granulator, the parameter such as real time record moment of torsion, pressure, material temperature.
Torque rheometer is divided into five sections from the heating part of feed end to mouth die, and heating-up temperature is 200 DEG C～250 DEG C.Its
In, bonded permanent ferrite magnetic powder carry out during mixing granulator through torque rheometer five parts heating-up temperature successively
For: 210 DEG C, 240 DEG C, 240 DEG C, 240 DEG C, 220 DEG C.
The process of mixing granulator is:
A. opening equipment, set the temperature from feed end to mouth die successively, device temperature arrives after design temperature 30 minutes
Extruding pelletization work can be carried out；
B. equipment moment of torsion and pressure are zeroed out operation；
C. adjustment screw speed is to 190 revs/min, adjusts equipment feed rotation to 8 revs/min；Torque rheometer dynamic realtime
Record the parameters such as the moment of torsion in granulation process, extrusion pressure, material temperature；
D., after treating that pelletize extrusion is stable, extrusion 20 minutes continuously, according to the number of this time period preserved on equipment
According to, calculate the average torque under steady extruding state, average extrusion pressure etc..
Preferably, the present invention selects four parts of permanent magnetic ferrite magnetic powders to be shaped to four ten six types of severe debility disease magnet rings.Permanent-magnet ferrite magnetic
Powder numbered 1#, 2#, 3#, 4#.Bonded permanent ferrite magnetic powder include 17 type samarium-cobalt permanent-magnetic materials ((BH) max more than 28MGOe,
Hcj is more than 20KOe) or sintered Nd-Fe-B permanent magnetic material (grasping coercivity EH and UH series in height).Bonded permanent ferrite magnetic
The parameter of powder mixing granulator process is as shown in table 1.
Table 1: mixing granulator procedure parameter
After mixing granulator, the bonded permanent ferrite magnetic powder particle with uniaxial anisotropy is injected into ring with molten state
In injection molding in shape pedestal, and rotational forming is the multipole magnet assembly with multipole magnetic characteristic under the influence of a magnetic field.
Specifically, enter mixing granulation process at bonded permanent ferrite magnetic powder and form bonded permanent ferrite magnetic powder particle
After, use the melt index values of fusion index instrument test extruding pelletization.Preferably, test temperature is 270 DEG C, load 5kg.Melted
Index is as shown in table 2.
Bonded permanent ferrite magnetic powder particle is injected into molten state the injection molding being arranged in circular base, thus
The bonded permanent ferrite magnetic powder with uniaxial anisotropy is made to rotate under the influence of a magnetic field and molding.
Preferably, the injection temperature of bonded permanent ferrite magnetic powder particle is 250 DEG C～300 DEG C.Wherein, bonded permanent
Oxysome magnetic powder particle heating-up temperature of five parts through injection device during injection moulding is followed successively by: 260 DEG C, 270
℃、280℃、290℃、300℃.It is further preferred that bonded permanent ferrite magnetic powder particle warp during injection moulding
The heating-up temperature of five parts crossing injection device is followed successively by: 260 DEG C, 270 DEG C, 280 DEG C, 290 DEG C, 295 DEG C.
As in figure 2 it is shown, caking property permanent magnetic ferrite magnetic powder is cooled into one in the device for manufacturing multipole magnet assembly
The multi-pole magnet-ring of body.Multi-pole magnet-ring includes the first annulus and the second annulus that concentric arranges.First annulus and the second annulus it
Between by the incorgruous spoke of at least two connect.The interior diameter of the second annulus is more than the overall diameter of the first former ring, and the second annulus sets
Put the outside at the first annulus.First annulus and the second annulus have different height.Spoke is in radiation profiles and spoke
Heart extended line converges at a bit on the axle center of the first annulus.Such as, what two spokes were arranged on through the first annulus center of circle is same
Symmetric position on straight line, and be arranged between the first annulus and the second annulus, thus by the second annulus and the second circle
Ring is connected as an entirety.Such as, in approximately the same plane, four spokes converge in the circle at the first annulus with elongated central line
The heart, and the elongated central wire clamp angle of adjacent spoke is 90 degree of angles.The elongated central line of the most adjacent spoke is orthogonal.
As it is shown on figure 3, the first annulus in ten six types of severe debility disease annulus and the second annulus is the most different.Indulging of first annulus
The longitudinally height of the second annulus it is more than to height.The longitudinal direction of the present invention refers to the normal direction vertical with the circular cross section of the first annulus
Direction.I.e. longitudinally identical with the axial direction of ten six types of severe debility disease magnet rings.Preferably, the present invention is with formation in ten six types of severe debility disease alignment magnetic fields
As a example by ten six types of severe debility disease annulus, the size of multipole annulus is illustrated.As shown in Figure 2.The inside diameter of the first annulus is 7mm, the
The outside diameter of one annulus is 10mm.The inside diameter of the first annulus and the difference of outside diameter are 3mm, the thickness of the i.e. first annulus
Degree is 3mm.The inside diameter of the second annulus is 15mm, and the outside diameter of the second annulus is 17mm.The inside diameter of the second annulus
Being 2mm with the difference of outside diameter, the thickness of the i.e. first annulus is 2mm.As it is shown on figure 3, the longitudinal direction height of the second annulus is
8mm.The longitudinal direction height of the first annulus is 1Omm.The outside of the first annulus is connected by spoke with the inner side of the second annulus, spoke
A length of 5mm, a width of 1mm.The longitudinally height of spoke is the most identical, for 8mm with the second annulus.Spoke be shaped as square
Shape strip.
After ten six types of severe debility disease magnet ring molding, need to detect Surface field parameter and the magnetic flux parameter of ten six types of severe debility disease magnet rings, thus comment
The magnetic characteristic of valency bonded permanent ferrite magnetic powder.
Measure the magnetic flux parameter of ten six types of severe debility disease magnet rings.Ten six types of severe debility disease magnet rings are arranged on the center of magnetic flux test fixture.Extremely
Lack two test poles centered by ten six types of severe debility disease magnet rings in radiation profiles.Test pole is wound around according to right-hand rule by insulated conductor
And the winding direction of the insulated conductor of adjacent test pole is contrary.Seal magnetic flux test fixture and carry out magnetic flux test, obtaining multipole
The magnetic flux parameter of magnet assembly.
Fig. 5 is the schematic diagram of magnetic flux test fixture.As it is shown in figure 5, magnetic flux test fixture is circular flat board, the thickness of flat board
For 15mm.The central authorities of circular flat board are provided with the circular magnetic loop identical with circular plate center and embed mouth.16 test poles with
In radiation profiles centered by circular magnetic loop embedding mouth.Preferably, the size of magnetic flux test fixture is: circular flat board a diameter of
70mm；Circular magnetic loop embeds a diameter of 17.5mm of mouth；The outer surrounding circle that test pole in radiation profiles is formed a diameter of
28mm；The cross-sectional width of single test pole is 1.5mm.
Ten six types of severe debility disease magnet rings are placed on the center of magnetic flux test fixture, i.e. circular magnetic loop embed in mouth.By pulling and pushing
Method tests the magnetic flux of ten six types of severe debility disease magnet rings.By the enamel-covered wire of each test pole 0.2mm on magnetic flux test fixture according to right hand spiral shell
Rotation rule is wound around 20 circles, and the coiling direction changing copper cash makes the opposite polarity of adjacent cartridge.With epoxy E44 tree after having prepared
Fat and 651 firming agent, by copper cash theater good seal, reserve lead-in wire and test for magnetic flux.Magnetic flux parameter is as shown in table 2.
Use Surface field compartment system that the Surface field of many magnetic poles device is measured, obtain ten six types of severe debility disease magnet rings
Surface field parameter.The Surface field parameter of ten six types of severe debility disease magnet rings is as shown in table 2.Surface field distribution curve is as shown in Figure 6.
The process of the Surface field distribution testing ten six types of severe debility disease magnet rings is:
A. the Surface field test software of Surface field test system support is started；
B. test fixture, fixing test sample and test probe are selected according to the feature of magnet ring；
Note: test probe is close proximity to sample surfaces；But it is not in close contact；
C. hit testing starts, and tests Surface field.
Comparative example
Select 1#, 2#, 3#, 4# permanent magnetic ferrite magnetic powder used in embodiment, by through mixing granulator PROCESS FOR TREATMENT
Bonded permanent ferrite magnetic powder particle is shaped to testing standard sample in injection molding mode.
The technological process of testing standard sample formation particularly as follows:
A. magnetic powder surface processes
Use silane coupler KH-590 that ferromagnetic oxide powder carries out surface and process concrete.Preferably, 1kg ferrite is weighed
Magnetic powder, is diluted to the standard solution of 10% by 10ml KH-590 coupling agent dehydrated alcohol；Magnetic powder is mixed all with standard solution
Even, and mixed solution is placed in 100 DEG C of drying baker be dried 2 hours stand-by.
B. mix
Surface treated permanent magnetic ferrite magnetic powder and binding agent are mixed to form bonded permanent ferrite magnetic powder.Will
Permanent magnetic ferrite magnetic powder that 1kg handles well on surface, 120g nylon 12,10g stearic acid amide lubricant are mixed in high-speed mixer
Close uniformly, form bonded permanent ferrite magnetic powder.
C. mixing granulator
Bonded permanent ferrite magnetic powder is carried out mixing granulator.Preferably, select torque rheometer to bonded permanent oxygen
Body magnetic powder carries out mixing granulator, forms bonded permanent ferrite magnetic powder particle.During mixing granulator, real time record is turned round
The parameters such as square, pressure, material temperature.
Torque rheometer is divided into five sections from the heating part of feed end to mouth die, and heating-up temperature is 200 DEG C～250 DEG C.Its
In, bonded permanent ferrite magnetic powder carry out during mixing granulator through torque rheometer five parts heating-up temperature successively
For: 210 DEG C, 240 DEG C, 240 DEG C, 240 DEG C, 220 DEG C.
D. melt index test
After bonded permanent ferrite magnetic powder entered mixing granulation process formation bonded permanent ferrite magnetic powder particle, use
The melt index values of fusion index instrument test extruding pelletization.Preferably, test temperature is 270 DEG C, load 5kg.Melt index is such as
Shown in table 2.
E. magnetism testing standard sample is formed in injection molding mode
Bonded permanent ferrite magnetic powder particle is formed magnetism testing standard sample in injection molding mode.Bonding is forever
The injection temperature of magnetic ferrites magnetic powder particle is 250 DEG C～300 DEG C.Wherein, bonded permanent ferrite magnetic powder particle is being injected into
During type, the heating-up temperature of five parts through injection device is followed successively by: 260 DEG C, 270 DEG C, 280 DEG C, 290 DEG C, 295 DEG C.
Standard sample is the two poles of the earth cylinder.Standard sample size: Φ 20mm × 10mm, alignment magnetic field 9000Gs, tests four
Performance parameter: remanent magnetism (Br) parameter, magnetic strength coercivity (Hcb) parameter, in grasp coercivity (Hcj) parameter, maximum magnetic energy product (BH)
Max parameter.Quadrinomial parameter is as shown in table 2.
Table 2: embodiment 1 and comparative example parameter list
Comparing embodiment parameter of magnetic characteristic and comparative example parameter of magnetic characteristic, the evaluation result of embodiment and the evaluation of comparative example
Result difference is bigger.
If four kinds of magnetic powders all use comparative example method of testing, remanent magnetism is ordered as 2# ＞ 1# ＞ 3# ＞ 4#；The magnetic characteristic of 2# is relatively
Good.
If four kinds of magnetic powders all use embodiment method of testing, Surface field is ordered as 4# ＞ 2# ＞ 3# ＞ 1#, wherein 1#,
2#, 3# table field is more or less the same, and 4# Surface field is than 1# big about 4%, and the magnetic characteristic of 4# is preferable.
Comparative example pass through four performance parameters: remanent magnetism (Br) parameter, magnetic strength coercivity (Hcb) parameter, in grasp coercivity
(Hcj) parameter, the magnetic characteristic of maximum magnetic energy product (BH) max parameter evaluation bonded permanent ferrite magnetic powder.Although quadrinomial parameter with
The Surface field of magnetic device has certain association to affect relation, but magnetic device Surface field influence factor is numerous, does not exists
Accurate and strict corresponding relation, even it sometimes appear that four performance indications of magnetic powder injection standard sample are more or less the same, but
Table field and the magnetic flux of final magnetic device but differ greatly, and therefore the evaluation result of comparative example exists limitation.
In the case of testing conditions is identical, magnetic flux and the Surface field of magnetic device are the highest, it is meant that magnetic powder magnetic characteristic
Better performances.The present invention passes through magnetic flux and Surface field parameter, and the magnetic characteristic more directly and accurately characterizing magnetic powder is good and bad.
Embodiment 2
The present embodiment is improving further and illustrating for manufacturing the device of multipole magnet assembly embodiment 1.With enforcement
The content that example 1 is identical repeats no more.
The hollow formed by non-magnet material for the device that manufacture multipole magnet assembly including be distributed in the present invention
At least two orientation magnet on circular base.At least two orientation magnet is for making ring in a fixed manner on circular base
Multipole magnet assembly in shape pedestal forms many magnetic poles characteristic in magnetic field.Be provided with outside circular base at least two for
The screens in dismountable mode fixed orientation magnetic field.Circular base includes circular rings pedestal, straight-flanked ring pedestal or regular polygon ring
Pedestal.
Fig. 4 is a kind of preferred implementation of the device for manufacturing multipole magnet assembly of the present invention.As shown in Figure 4, take
It is high-performance rare-earth permanent magnet material to the permeability magnetic material of magnet 1.Circular base is circular rings pedestal 3.The non-of circular rings pedestal 3 is led
Magnetic material includes hard alloy and austenitic stainless steel material.Multipole magnet assembly is multi-pole magnet-ring 2.Multi-pole magnet-ring 2 is formed at ring
In injection molding in shape pedestal 3.
According to a preferred implementation, orientation magnet is distributed and adjacent pole in homogeneous radiation centered by circular base
Opposite polarity.In injection molding, multi-pole magnet-ring it is injection molded into by caking property permanent magnetic ferrite magnetic powder in circular base.Note
Perforation is arranged on injection molding.
Caking property permanent magnetic ferrite magnetic powder forms multi-pole magnet-ring after molding cooling in injection molding.Multiple orientation magnet shapes
The alignment magnetic field become defines the pole number of multi-pole magnet-ring.Such as, the number of orientation magnet is eight, then eight orientation magnet shapes
Become the alignment magnetic field of eight magnetic poles.The caking property permanent-magnetic oxyferrite magnetic ring formed in the alignment magnetic field of eight magnetic poles is ends of the earth magnetic
Ring.If the number of orientation magnet is 12, then 12 orientation magnets form the alignment magnetic field of 12 magnetic poles.At 12 magnetic
The caking property permanent-magnetic oxyferrite magnetic ring formed in the alignment magnetic field of pole is 12 pole magnet rings.Preferably, the magnetic conduction material of orientation magnet 1
Material is high-performance rare-earth permanent magnet material.The non-magnet material of circular base includes hard alloy and austenitic stainless steel material.Many
Pole magnet ring 2 is formed in circular base 3.
The present invention is formed 16 by bonded permanent ferrite magnetic powder in the annulus pedestal that 16 orientation magnets are distributed
Pole magnet ring.As shown in Figure 4, the device for manufacture ten six types of severe debility disease magnetic devices includes 16 orientation magnets, non-magnetic circular ring group
Seat and injection molding.Being provided with the equally distributed screens of at least two outside circular rings pedestal, screens is used for fixed orientation magnet.
16 equally distributed screens it are provided with outside circular rings pedestal.Preferably, outside circular rings pedestal uniform distribution full with
The screens of orientation magnet coupling, it is simple to the number of on-demand installation orientation magnet.
The orientation magnet being made up of permeability magnetic material be cross section be rectangular cube.The polarity at the two ends of orientation magnet
Difference, one end is S pole, and one end is N pole.16 orientation magnets around centered by non-magnetic circular rings pedestal in radiation profiles.
One end of orientation magnet and circular rings base into contact, and the center of circle that the elongated central line of orientation magnet is by circular rings pedestal.
The adjacent orientation magnet polarity near one end of circular rings pedestal is different and noncontact each other.That is, the S pole of oriented adjacent magnet
The most adjacent with N and be spaced from each other a distance.Preferably, orientation magnet is cuboid.Orientation magnet cross section is rectangle.Long
Square a length of 20mm, width is 2mm.The height of orientation magnet is 15mm.Circular rings pedestal is for be made up of non-magnet material
There is certain thickness circular base.Circular rings pedestal has inner radius and outer radius.The inner radius of annulus is with outer
The difference of side radius is 2mm.That is, the thickness of circular rings pedestal is 2mm.
Preferably, orientation magnet 1 also includes cylindrical magnet and polygon bar-shaped magnet.Orientation magnet 1 can be solid
Magnet, it is also possible to be the inside hollow magnet with cavity.Cylindrical orientation magnet 1 can be isometrical magnet, it is also possible to be
Reducing magnet.Reducing magnet refers to the magnet that the diameter at magnet two ends is different and gradually changes.
According to a preferred implementation, orientation magnet around centered by circular rings pedestal in uneven radiation profiles.
That is, the spacing of adjacent orientation magnet is unequal.Such as, be 1,2,3 by 16 orientation magnet number consecutivelies ... 14,15,
16.The N pole of orientation magnet 1 contacts with circular base.The S pole of orientation magnet 2 contacts with circular base.Orientation magnet 3
N pole contact with circular base.The S pole of orientation magnet 4 contacts with circular base.... the N pole of orientation magnet 15 and ring
Shape base into contact.The S pole of orientation magnet 16 contacts with circular base.The contact jaw of adjacent orientation magnet and circular base that
This is different.Distance between orientation magnet is regularity distribution.Pole pitch between orientation magnet is distributed with the rule of ABAB.
Such as, the N pole of orientation magnet 1 is A with the distance of the S pole of orientation magnet 2, the S pole of orientation magnet 2 and orientation magnet 3
Number the distance of N pole be B.The N pole of orientation magnet 3 is A with the distance of the S pole of orientation magnet 4, the S pole of orientation magnet 4
It is B with the distance of the N pole of orientation magnet 5.By that analogy, the adjacent distance between orientation magnet is A and B is interspersed.
Preferably, the pole pitch between orientation magnet is distributed with the rule of AABB.Such as, the N pole of orientation magnet 1 with take
Distance to the S pole of magnet 2 is A, and the S pole of orientation magnet 2 is A with the distance of the N pole of orientation magnet 3.Orientation magnet 3
Number the distance of S pole of N pole and orientation magnet 4 be B, the S pole of orientation magnet 4 with the distance of the N pole of orientation magnet 5 is
B.The N pole of orientation magnet 5 is A with the distance of the S pole of orientation magnet 6, the S pole of orientation magnet 6 and orientation magnet 7
The distance of N pole is A.By that analogy, the adjacent distance between orientation magnet is AA and BB is interspersed.
Preferably, the pole pitch between orientation magnet is distributed with the rule of AAAABBBB.
Preferably, according to the difference of orientation magnet number, the pole pitch between orientation magnet can also be in ABCABC rule
Distribution.Such as, for manufacturing the device of nine pole magnet rings, including nine orientation magnetic centered by circular base in radiation profiles
Body.Then the pole pitch between nine orientation magnets is ABCABCABC distribution.
The alignment magnetic field formed according to the orientation magnet of rule distribution is uniform.In alignment magnetic field, injection is formed many
The magnetic of pole magnet ring is uniform.Special by the magnetic flux of test multi-pole magnet-ring and the magnetic of table field sign caking property permanent magnetic ferrite magnetic powder
Property.
Embodiment 3
Multipole magnet assembly in previous embodiment is further improved and illustrates by the present embodiment, and identical content is no longer
Repeat.
A kind of multipole magnet assembly, multipole magnet assembly by bonded permanent ferrite magnetic powder many for manufacturing multipole magnet assembly
Molding in magnetic pole injection molding.The magnetic being evaluated bonded permanent ferrite magnetic powder by the magnetic characteristic measuring multipole magnet assembly is special
Property.Wherein, integrated multipole magnet assembly includes that the first annulus that concentric arranges, interior diameter are more than the first annulus overall diameter
The second annulus and at least two connect the first annulus and the spoke of the second annulus, the height of the first annulus is more than the second annulus
Highly.
Spoke is that the elongated central line of radiation profiles and spoke converges at a bit on the axle center of the first annulus.Such as Fig. 2 institute
Show, be provided with four spokes between the first magnet ring and the second magnet ring, thus increase stablizing between the first annulus and the second annulus
Property.Preferably, between concentric is arranged the first annulus and the second annulus by four spokes with adjacent center extended line intersection it is
The mode of an angle of 90 degrees converges at a bit on axle center.The setting of four spokes avoids the first annulus in use owing to being subject to
The consequence that power is unbalanced and deforms, adds the stability between the first annulus and the second annulus, makes multi-pole magnet-ring entirety be difficult to
Deformation, increases the service life.Meanwhile, at least one spoke in use has supporting role to the second annulus, it is to avoid
The deformation of the second annulus.Compared with the multi-pole magnet-ring that single annulus is formed, the stability of the multi-pole magnet-ring of the present invention is higher, less
Yielding.
Preferably, spoke is the axle center that the elongated central line of radiation profiles and spoke does not converge at the first annulus.Spoke
Elongated central line does not converge at the axle center of the first annulus, converges at other positions.It is arranged between the first annulus and the second annulus
Spoke there is isolation the effect that supports equally.
Preferably, spoke is that the mode of identical angle is uniform according to the tangent line of elongated central line and the first annulus overall diameter
It is distributed between the first annulus and the second annulus.Such as, at least two spoke is the side at 60 degree of angles with the tangent line with the first annulus
Formula is distributed between the first annulus and the second annulus, the first annulus and the second annulus is connected as one.
Preferably, spoke includes circular bar, rectangular strip and/or polygon bar.Circular bar also includes isometrical bar and reducing bar.
Isometrical bar refers to that the diameter of the cylinder between circular bar two ends is the most equal.Reducing bar refers to the cylinder between circular bar two ends
Diameter is unequal, and the diameter between two ends gradually changes.
Preferably, the first annulus of multi-pole magnet-ring and the annular that cross section is plane of the second annulus.Or, multipole magnetic
First annulus of ring and the annular cross section of the second annulus are the arcwall face with radian.Or, the first annulus of multi-pole magnet-ring
It is the polygon ring surface with crest line with the annular cross section of the second annulus.
As in figure 2 it is shown, the inside diameter of the first annulus of ten six types of severe debility disease magnet rings is 7mm, the outside diameter of the first annulus is
10mm.The inside diameter of the first annulus and the difference of outside diameter are 3mm, and the thickness of the i.e. first annulus is 3mm.Second annulus
Inside diameter is 15mm, and the outside diameter of the second annulus is 17mm.The inside diameter of the second annulus with the difference of outside diameter is
2mm, the thickness of the i.e. first annulus is 2mm.As it is shown on figure 3, the longitudinal direction height of the second annulus is 8mm.The longitudinally height of the first annulus
Degree is 10mm.The outside of the first annulus is connected by spoke with the inner side of the second annulus, a length of 5mm of spoke, a width of 1mm.Spoke
The longitudinally height of bar is the most identical, for 8mm with the second annulus.Spoke be shaped as rectangular strip.
The size of the multipole magnet assembly of the present invention is not limited to above-mentioned size.The multi-pole magnet-ring of the present invention has sizes,
Can equal proportion expand or shrink as required.And, the present invention can adjust injection molding according to actual needs, thus adjusts
Distance between first annulus and the second annulus.
It should be noted that above-mentioned specific embodiment is exemplary, those skilled in the art can be open in the present invention
Find out various solution under the inspiration of content, and these solutions also belong to disclosure of the invention scope and fall into this
Within bright protection domain.It will be understood by those skilled in the art that description of the invention and accompanying drawing thereof be illustrative and not
Constitute limitations on claims.Protection scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. the evaluation methodology of a bonded permanent ferrite magnetic powder magnetic characteristic, it is characterised in that the step bag of described evaluation methodology
Include:
Bonded permanent ferrite magnetic powder is shaped to multipole magnet assembly in the device being used for manufacturing multipole magnet assembly,
The magnetic characteristic of described bonded permanent ferrite magnetic powder is evaluated by the magnetic characteristic measuring described multipole magnet assembly；Wherein,
The described device for manufacturing multipole magnet assembly includes being distributed on the circular base formed by non-magnet material at least
Two orientation magnets, described at least two orientation magnet is for making circular base in a fixed manner on described circular base
Multipole magnet assembly in magnetic field, form many magnetic poles characteristic.
2. the evaluation methodology of bonded permanent ferrite magnetic powder magnetic characteristic as claimed in claim 1, it is characterised in that there is single shaft
Anisotropic described bonded permanent ferrite magnetic powder is injected in the injection molding in described circular base with molten state, and
Rotational forming is the multipole magnet assembly with many magnetic poles characteristic under the influence of a magnetic field.
3. the evaluation methodology of bonded permanent ferrite magnetic powder magnetic characteristic as claimed in claim 2, it is characterised in that described bonding
The melt temperature of permanent magnetic ferrite magnetic powder is 250 DEG C～300 DEG C, and wherein, described bonded permanent ferrite magnetic powder is in injection moulding
During be followed successively by through the heating-up temperature of five parts of injection device: 260 DEG C, 270 DEG C, 280 DEG C, 290 DEG C, 300 DEG C.
4. the device being used for manufacturing multipole magnet assembly, it is characterised in that described device includes being distributed in by non-magnet material
At least two orientation magnet on the circular base of the hollow formed, described at least two orientation magnet is in described circular base
The multipole magnet assembly in circular base is made to form many magnetic poles characteristic, described circular base in magnetic field on seat in a fixed manner
Outside is provided with at least two for being detachably secured the screens of described alignment magnetic field.
5. the device for manufacturing multipole magnet assembly as claimed in claim 4, it is characterised in that be orientated magnetic described at least two
Body in equidistant mode uniformly in radiation profiles in the screens of described circular base.
6. the device for manufacturing multipole magnet assembly as claimed in claim 4, it is characterised in that the distribution of described orientation magnet
Being uneven, described orientation magnet is fixed in the screens of described circular base according to the uneven regularity of distribution.
7. the device for manufacturing multipole magnet assembly as described in one of aforementioned claim 4 to 6, it is characterised in that described ring
Shape pedestal includes circular rings pedestal, straight-flanked ring pedestal or regular polygon ring group seat.
8. a kind of multipole magnet assembly as described in one of aforementioned claim, it is characterised in that described multipole magnet assembly is by boning
Permanent magnetic ferrite magnetic powder molding in the injection molding for manufacturing multipole magnet assembly, by measuring the magnetic of described multipole magnet assembly
Characteristic evaluates the magnetic characteristic of described bonded permanent ferrite magnetic powder；Wherein,
Integrated described multipole magnet assembly includes that the first annulus that concentric arranges, interior diameter are more than outside described first annulus
Second annulus of diameter and at least two connect the first annulus and the spoke of the second annulus, and the height of described first annulus is more than institute
State the height of the second annulus.
9. multipole magnet assembly as claimed in claim 8, it is characterised in that described spoke is in radiation profiles and described spoke
Heart extended line converges at a bit on the axle center of described first annulus；Or
Described spoke is the axle center that the elongated central line of radiation profiles and described spoke does not converge at described first annulus；Or
Described spoke uniformly divides according to the mode that the tangent line of elongated central line with described first annulus overall diameter is identical angle
Cloth is between described first annulus and described second annulus.
10. multipole magnet assembly as claimed in claim 8 or 9, it is characterised in that described first annulus of described multipole magnet assembly
With the annular that cross section is plane of described second annulus, described spoke includes circular bar, rectangular strip and/or polygon bar,
Described circular bar also includes isometrical bar and reducing bar.
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| CN111638477A (en) * | 2020-05-18 | 2020-09-08 | 广州天兹新材料科技有限公司 | Method for nondestructive testing of sheet metal magnetic powder magnetic permeability |
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