CN101673606B - Isotropic bonded NdFeB magnet and magnetic roller consisting of same - Google Patents
Isotropic bonded NdFeB magnet and magnetic roller consisting of same Download PDFInfo
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- CN101673606B CN101673606B CN 200810042620 CN200810042620A CN101673606B CN 101673606 B CN101673606 B CN 101673606B CN 200810042620 CN200810042620 CN 200810042620 CN 200810042620 A CN200810042620 A CN 200810042620A CN 101673606 B CN101673606 B CN 101673606B
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Abstract
The invention relates to a magnetic roller used in a laser printer and a copier. An isotropic bonded NdFeB magnet used by the magnetic roller contains rare earth permanent magnetic powder and adhesive resin, wherein the rare earth permanent magnetic powder is a mixture of NdFeB magnetic powder and ferrit magnetic powder, and the formed magnet has the length of between 210 and 910mm. When the isotropic bonded NdFeB magnet is used to replace one or more ferrit permanent magnet poles in the magnetic roller, because the bonded NdFeB magnet has stronger magnetic performance than ferrit magnets, a strong magnetic filed can be formed on an outer surface taking the bonded NdFeB magnet as a pole so as to provide stronger magnetic filed adsorptive power, contribute to the size distribution of multiple kinds of color matching powder, and reduce the grey back of copying and printing to contribute to clear imaging.
Description
Technical field
The present invention relates to use the magnetic roller technical field in printer, photocopier.
Background technology
The magnetic roller is the critical component that develops in laser printer and photocopier, the quality of its performance direct relation imaging.At present, typical magnetic roller comprises mandrel, is fixed on the outer cylindrical permanent-magnet body of said mandrel, and permanent magnet surfaces has a plurality of magnetic poles that extend vertically, and magnetic roller overcoat has sleeve, and the magnetic roller can rotate relative to sleeve.Its operation principle is: by relatively rotating of magnetic roller and sleeve, the magnetic roller is adsorbed onto the magnetic developer on the surface of sleeve, then is transported to imaged sector and utilizes static charge developing.Usually such magnetic roller external diameter has 10～60mm, and length 200～350mm is elongated cylindrical.
By above-mentioned magnetic roll structure as can be known, its core is the permanent magnet as pole material, maximum magnetic roller pole material of using at present is by isotropic ferrite sintered magnet or ferromagnetism particle (as Sr ferrite and Ba ferrite) etc., itself and resin (polyamide, polyvinyl chloride etc.) are mixed, then after whole compressing or injection moulding, magnetize and get according to certain pole configuration mode in magnetic field.The disclosed a kind of magnetic roller of example European patent EP 0092440A, its pole material adopts the barium strontium ferrite, and magnetic pole is attached to the magnetic conduction mandrel surface of rectangle, and the magnetic roller diameter that obtains is about 35mm.
There is certain defective in above-mentioned integrally formed permanent magnet pole material.On technique, there is difficulty in the magnet monolithic molding, is difficult for multipole magnetization after monolithic molding.On performance, the material of use mostly is ferrite permanent magnet, is subjected to the restriction of material itself, and its magnetic property is lower, and the absorption affinity that the magnetic roller provides is not strong, can not satisfy the demand that high-quality image quality is printed.Simultaneously, ferrite permanent-magnet materials Hc is lower, easily demagnetization.
In order to satisfy the requirement of printing high-quality image quality, in the industry from aspects such as structure, materials, to having done a lot of improvement as the permanent magnet of the pole material in the magnetic roller.
At first the structure of the permanent magnet in the magnetic roller is improved, it is divided into several magnets from original whole magnet, on axle according to different magnetic poles configuration bonding left magnetic roller after magnetizing, the benefit of doing like this facilitates magnet to be shaped exactly, can also carry out configurations of magnets according to the demand of different magnetic poles performances.For example Chinese patent 90101761 discloses a kind of magnetic roller, and its pole material is take the CeCoCuFe rare-earth permanent magnet as matrix, and different magnetic poles is partly allocated the SmCo of different amounts into
5The alloyed powder die forming, the centre is the magnetic conduction mandrel of polygonal cross-section, between each magnetic pole with resin filling, be bonded together and consist of the magnetic roller.
The above-mentioned CeCoCuFe rare-earth permanent magnet as pole material, different magnetic poles mix the SmCo of different amounts according to the magnetic property power
5, its advantage is that magnet is convenient to make, and is convenient to magnetize.But due to the restriction that is subjected to material, its magnetic property is also lower, and the absorption affinity that the magnetic roller provides is not strong, can not satisfy the needs that high-quality image quality is printed.
Also disclose in the industry with the invention of the stronger anisotropic bonded rare earth magnet of magnetic property as magnetic roller pole material.For example China Patent Publication No. is that CN1315679A discloses a kind of magnetic roller, it is characterized by, have a plurality of magnetic poles on the surface, at least one pole parts adopts the anisotropic bond magnetite, it is magnetic and binding resin that described bonding magnetite comprises R-T-N, can provide the magnetic property stronger than ferrite permanent magnet to satisfy the demand of printing.But, as anisotropic bonding R-T-N magnet, can provide higher magnetic field intensity, but it can not as isotropic magnet, form any pole configuration by magnetization.And, because size is long, be difficult to the magnetic field of the homogeneous that obtains in axial direction to go up, and the axial uniformity in magnetic field can affect the quality of imaging to a great extent.Simultaneously, also involve complex process, the problem such as production cost is higher.
To sum up state, compared to existing technology, we think, need a kind of like this magnetic roller, and it can provide stronger magnetic field, and magnetic field along the magnetic roll shaft to uniformity fine, satisfy the demand that high image quality is printed.Simultaneously, also to consider the pole material preparation in the magnetic roller, the complexity of the technique such as magnetize.
Summary of the invention
One of purpose of the present invention is to provide a kind of isotropic Agglutinate neodymium-iron-boron magnet.
Another object of the present invention is to provide the magnetic roller that comprises that above-mentioned isotropic Agglutinate neodymium-iron-boron magnet forms.This New Magnetic Field Controlled roller overcomes the defects that the class prior art exists, and can satisfy better the needs of relevant branch of industry.
Isotropic Agglutinate neodymium-iron-boron magnet of the present invention is made of rare earth permanent magnet powder and binding resin, and wherein rare earth permanent magnet powder is the mixture of neodymium iron boron class magnetic and ferromagnetic oxide powder, and the shaping magnet length is 210mm～910mm.
Magnet has good body, the mm of flexibility≤(L/1000) along its length, and wherein L is the length of magnet.
Above-mentioned isotropic Agglutinate neodymium-iron-boron magnet, wherein the percentage by weight of NdFeB magnetic powder and ferromagnetic oxide powder is 2～9:1.
Above-mentioned binding resin is selected from polyamide, one or more in preferred nylon 6, nylon 12, nylon 6-12, nylon 66 and NYLON610 etc.Add thermoplastic polyamide, can significantly improve the formability of magnet, the product mechanical strength of acquisition is high.
Above-mentioned neodymium iron boron class magnetic can use the market universal product, the fast quenching NdFeB magnetic powder of preferable particle size 50-100 μ m.
Above-mentioned ferromagnetic oxide powder is the market universal product, and preferable particle size is the ferromagnetic oxide powder of 0.5-3 μ m, can be barium ferrite (BaO
6Fe
2O
3), can be also strontium ferrite (SrO
6Fe
2O
3).Add ferromagnetic oxide powder, its benefit is: because the particle of ferrite permanent-magnet powder is fine and closely woven than the particle of neodymium iron boron class magnetic, the appropriate interpolation also after sufficiently mixing, can fill the space between the neodymium-iron-boron powder particles, thereby improve the magnet shaping density, and can improve the mobility of raw material, be convenient to be shaped.But excessive interpolation ferrite hydromagnetic powder can reduce the magnetic property of magnet to a certain extent.
By the composition proportion of binding resin and rare earth permanent magnet powder in the adjustment raw material, can adjust the magnetic property of described magnet, satisfy the demand of different magnetic poles configuration, preferred percentage by weight is:
Rare earth permanent magnet powder 90～96%, binding resin 4%～10%.
Add the magnetic property that too much resin can reduce magnet, the binding resin content of recommendation is 4%～10%, and preferred content range is 4%～7%.
The preparation method of the said isotropic Agglutinate neodymium-iron-boron magnet of the present invention comprises the steps:
A, at first above each raw material is mixed according to proportioning;
B, will more than raw material after mixing mixing, obtain granular composition;
C, above-mentioned granular composition is sent in extruder, heating makes the composition melting, more successively by mould, then cooling, be shaped at last, form Len req and shape after cutting;
Above-mentioned step a, mixing can be carried out in common mixer, the preferred 3-5 of incorporation time minute.
Above-mentioned step b adopts the mixing rolls such as two axle mixing rolls or roll-type mixing roll, kneader to carry out mixing, and melting temperature should be higher than the melting temperature of binding resin, generally at 200 ℃～270 ℃.Mixing time is advisable with 20kg per hour～50kg material.After mixing, obtain being applicable to prepare the granular composition of isotropic Agglutinate neodymium-iron-boron magnet.
Above-mentioned step c, above-mentioned granular composition is sent in extruder by the extrusion shaper feed arrangement, heating makes the composition melting, 200 ℃～270 ℃ of heating-up temperatures, melting temperature higher than binding resin, extruder inside is 6MPa～10Mpa to the melting charge applied pressure, controls fused mass at the flow velocity of extruder inside by the pressure of adjusting extruder inside, thereby controls the speed of product shaping.Fused mass successively by mould, cuts to needed length after cooling under the effect that extruder is exerted pressure, the shape of magnet is determined by the shape of cross section of mould.
Isotropic Agglutinate neodymium-iron-boron magnet is to use the extrusion method preparation, and extrusion method and the other two kinds of production methods of bonded permanent magnet: compression molding is compared with injection moulding, is suitable for preparing longilineal Agglutinate neodymium-iron-boron magnet.Therefore, the bonded permanent magnet that utilizes extrusion method to prepare can be prepared longer, homogeneous magnet easily, namely meet the magnet shape characteristics, be beneficial to again the magnet shaping, thereby satisfy the needs of different print sizes, and can effectively reduce the volume of magnetic roller.
Before magnet uses, can utilize as required following methods to magnetize: magnet is placed in the middle of two coils, be connected with direct current in coil, direct current can be provided by common steady current source, difference according to product, in control coil, current strength is 15～20 amperes, according to the needs of pole configuration, magnet is carried out saturation magnetization.
Utilize isotropic Agglutinate neodymium-iron-boron magnet of above method preparation, its shape of cross section is restriction not, can be block, fan-shaped, rectangle etc.
Above-mentioned equipment such as mixer, mixing roll, extrusion shaper are all the general product in market, there is no specific (special) requirements in the present invention.
Utilize isotropic Agglutinate neodymium-iron-boron magnet of said method preparation, its residual magnetic flux density Br is 600～720mT, more than (BH) max reaches 7MGOe.
The present invention has also announced a kind of a kind of magnetic roller that is made of above-mentioned isotropic Agglutinate neodymium-iron-boron magnet, this magnetic roller comprises mandrel and is fixed on permanent magnet pole on axle, the quantity of its magnetic pole is N, N is the integer greater than 2, it is characterized in that, wherein at least one magnetic pole contains isotropic Agglutinate neodymium-iron-boron magnet.
Above-mentioned magnetic roller, preferred number of magnetic poles N:4≤N≤8.All the other magnetic poles can adopt other permanent magnetic material, as ferrite permanent magnet etc.
Magnetic roller of the present invention is assembling like this:
With isotropic Agglutinate neodymium-iron-boron magnet and the permanent-magnet ferrite magnet of saturation magnetization, the method by bonding is bonded on mandrel, use resin filling between each magnetic pole, then carries out surface treatment, makes total become elongate cylindrical shape, formation one magnetic roller.
In addition, magnetic roller of the present invention can also be equipped like this: closely be fixed on the ferrite permanent magnet magnetic pole on mandrel, leave a groove in the ferrite permanent-magnet surface, isotropic Agglutinate neodymium-iron-boron magnet of preparation is fixed in groove, isotropic Agglutinate neodymium-iron-boron magnet forms separately one or more magnetic poles, magnetic roller of whole formation.
Beneficial effect of the present invention:
Isotropic Agglutinate neodymium-iron-boron magnet of the present invention than ferrite permanent magnet and other hydromagnetic material, has higher magnetic energy product and remanent magnetism, can provide stronger magnetic field to satisfy the needs of printing.And, because neodymium iron boron magnetic body has higher Hc, be difficult for demagnetization, thereby extended useful life.Simultaneously, because Agglutinate neodymium-iron-boron magnet is isotropic, institute can obtain more uniform magnetic field vertically so that magnetize.
Magnet length scope of the present invention is at 210mm～910mm, is fit to the needs of from A4 to A0 different breadth printers or photocopier.
Be all that ferrite permanent magnet is compared as the magnetic roller of pole material, magnetic roller of the present invention has advantages of following: when pole material all is ferrite permanent magnet, the magnetic field shape of each magnetic pole on magnetic roller surface is sinusoidal shape of cycle or zigzag distributes, and each magnetic pole peak value does not have too big-difference.in the magnetic roller, the effect of each magnetic pole is different, the magnetic field intensity of each magnetic pole is also different, design according to magnetic roller magnetic circuit, when using isotropic Agglutinate neodymium-iron-boron magnet to replace one or more ferrite permanent magnet magnetic pole, because Agglutinate neodymium-iron-boron magnet has stronger magnetic property than ferrimagnet, therefore, can form a stronger magnetic field at the outer surface that Agglutinate neodymium-iron-boron magnet is magnetic pole, thereby can provide stronger magnetic field absorption affinity, the particle size distribution that is conducive to various chromatic timing powders (its carrier is little iron powder), reduce and duplicate, the grey end of printing, thereby be conducive to blur-free imaging.
Description of drawings
Fig. 1 is the resulting magnetic roller of the embodiment of the present invention 1 cross-sectional view
Fig. 2 is the resulting magnetic roller of the embodiment of the present invention 2 cross-sectional view
Fig. 3 is the resulting magnetic roller of the embodiment of the present invention 3 cross-sectional view
Fig. 4 is the resulting magnetic roller of the embodiment of the present invention 4 cross-sectional view
Embodiment
Referring to Fig. 1～Fig. 4, magnetic roller of the present invention, it is shaped as cylinder, comprises mandrel and permanent magnet pole fixed thereon.The quantity of its magnetic pole is N, and N is the integer greater than 2, and is preferred, number of magnetic poles N=4～8.Wherein, at least one pole parts is comprised of isotropic Agglutinate neodymium-iron-boron magnet, and all the other magnetic poles can adopt other permanent magnetic material, as the ferrite water magnet.
In figure, 11 is the mandrel of magnetic roller, and 12 is isotropic Agglutinate neodymium-iron-boron magnet, and 13 is ferrite permanent magnet, fills with resin 14 between each magnetic pole.S1, S2, S3, S4, N1, N2, N3, N4 represent magnetic poles different on the magnetic roller.
The cross sectional shape of the magnetic pole 12 that isotropic Agglutinate neodymium-iron-boron magnet forms is thousand meanings, there is no impact for effect of the present invention.Typical example, rectangle as shown in Figure 1, the straight flange as shown in Fig. 2,3,4 is fan-shaped, can be also that hypotenuse is fan-shaped etc.
The length of said Agglutinate neodymium-iron-boron magnet determines according to different printer breadths, for example goes for the printer of A4 breadth, also goes for the demand of the printer of A0 breadth.Its length range is: 220～910mm.
Magnet has good body, the mm of flexibility≤(L/1000) along its length, and wherein L is the length of magnet.
By adjusting the proportioning of each component in raw material, the residual magnetic flux density Br of isotropic Agglutinate neodymium-iron-boron magnet is 600～720mT, more than magnetic energy product (BH) max reaches 7MGOe.
A kind of magnetic roller, structure are provided with 4 magnetic poles as shown in Figure 1, and one of them magnetic pole N1 is that isotropic Agglutinate neodymium-iron-boron magnet 12 forms.11 is the mandrel of magnetic roller, and all the other magnetic poles are comprised of ferrite permanent magnet 13, and 14 for filling the resin of use.
Magnetic pole N1 is comprised of isotropic Agglutinate neodymium-iron-boron magnet, each component proportion of described magnet following (weight):
Agglutinate neodymium-iron-boron class permanent magnetism powder 86%,
Ferrite permanent-magnet powder 10%
Binding resin 4%
Said Agglutinate neodymium-iron-boron class permanent magnetism powder, the particle diameter of raw material is about 70～100 μ m;
The ferromagnetic oxide powder particle diameter is 0.9～1.2 μ m;
Binding resin is selected from polyamide nylon 6 and nylon 12, and the part by weight of nylon 6 and nylon 12 is 1:1;
Said isotropic Agglutinate neodymium-iron-boron magnet is preparation like this:
At first above each raw material is mixed after according to the proportioning accurate weighing, be blended in common mixer and carry out, incorporation time 4-5 minute.
Adopt the roll-type mixing roll to carry out in the material after above mixing mixing, 230 ℃～240 ℃ of melting temperatures are higher than the melting temperature of binding resin.Mixing time is with 40kg～43kg per hour.After mixing, obtain being applicable to prepare the granular composition of isotropic Agglutinate neodymium-iron-boron magnet, the composition average grain diameter is at 2～3mm.
Again above-mentioned granular composition is sent in extruder by the extrusion shaper feed arrangement, heating makes the composition melting, 240 ℃～250 ℃ of heating-up temperatures, higher than the melting temperature of binding resin, extruder inside is 7MPa～8MPa to the melting charge applied pressure.Fused mass passes through mould successively under the effect that extruder is exerted pressure, then cooling, is shaped at last, after cutting, obtain isotropic Agglutinate neodymium-iron-boron magnet, its cross sectional shape such as Fig. 1, length is 220mm, and flexibility is 0.15mm along its length, is applicable to the printer of A4 breadth.The maximum magnetic energy product of magnet (BH) max is 10MGOe, and Br is 710mT.
The resulting magnetic roller of the present embodiment is to equip like this.
With the isotropism Agglutinate neodymium-iron-boron magnet of preparation with after ferrite permanent magnet magnetizes as requested, each magnetic pole is bonded on mandrel, then use resin filling between each magnetic pole, carry out obtaining after surface treatment magnetic roller as shown in Figure 1.
A kind of magnetic roller, structure such as Fig. 2 are provided with 6 magnetic poles, and wherein two magnetic pole N1, S1 are comprised of isotropic Agglutinate neodymium-iron-boron magnet.11 is the mandrel of magnetic roller, and the residue magnetic pole is comprised of ferrite permanent magnet 13.
Magnetic pole N1, S1 are comprised of isotropic Agglutinate neodymium-iron-boron magnet, and each component proportion of described magnet is as follows: (weight)
Agglutinate neodymium-iron-boron class permanent magnetism powder 78%,
Ferrite permanent-magnet powder 15%
Binding resin 7%
Said Agglutinate neodymium-iron-boron class permanent magnetism powder, the particle diameter of raw material is about 70～100 μ m;
The ferromagnetic oxide powder particle diameter is 0.9～1.2 μ m;
Binding resin is selected from nylon 6, nylon 12 and nylon 6-12, and the part by weight of nylon 6, nylon 12 and nylon 6-12 is 1: 1: 1;
Said isotropic Agglutinate neodymium-iron-boron magnet is preparation like this:
At first above each raw material is mixed after according to the proportioning accurate weighing, be blended in common mixer and carry out, incorporation time 4-5 minute.
Adopt the roll-type mixing roll to carry out in the material after above mixing mixing, 250 ℃～260 ℃ of melting temperatures are higher than the melting temperature of binding resin.Mixing time is with 45kg～48kg per hour.After mixing, obtain being applicable to prepare the granular composition of isotropic Agglutinate neodymium-iron-boron magnet, the composition average grain diameter is at 2～3mm.
Again above-mentioned granular composition is sent in extruder by the extrusion shaper feed arrangement, heating makes the composition melting, 260 ℃～270 ℃ of heating-up temperatures, higher than the melting temperature of binding resin, extruder inside is 6MPa～8Mpa to the melting charge applied pressure.Fused mass passes through mould successively under the effect that extruder is exerted pressure, then cooling, is shaped at last, after cutting, obtain isotropic Agglutinate neodymium-iron-boron magnet, its cross sectional shape such as Fig. 2, length is 310mm, and flexibility is 0.23mm along its length, is applicable to the printer of A3 breadth.The magnetic energy product of product is 9MGOe, and Br is 680mT.
The resulting magnetic roller of the present embodiment is to equip like this.
With the isotropism Agglutinate neodymium-iron-boron magnet of preparation with after ferrite permanent magnet magnetizes as requested, according to the pole configuration requirement, be that fan-shaped block magnet is bonded in fixed central spindle with each cross section, obtain magnetic roller as shown in Figure 2.
A kind of magnetic roller, structure such as Fig. 3 are provided with 8 magnetic poles, and wherein two magnetic pole N1, S1 are comprised of isotropic Agglutinate neodymium-iron-boron magnet.11 is the mandrel of magnetic roller, and the residue magnetic pole is comprised of ferrite permanent magnet 13.
Magnetic pole N1, S1 are comprised of isotropic Agglutinate neodymium-iron-boron magnet, and each component proportion of described magnet is as follows: (weight)
Agglutinate neodymium-iron-boron class permanent magnetism powder 70%,
Ferrite permanent-magnet powder 20%
Binding resin 10%
Said Agglutinate neodymium-iron-boron class permanent magnetism powder, the particle diameter of raw material is about 70～100 μ m;
The ferromagnetic oxide powder particle diameter is 0.9～1.5 μ m;
Binding resin is selected from nylon 6, nylon 66 and nylon 12, and the part by weight of nylon 6, nylon 66 and nylon 12 is 2: 1: 1;
Said isotropic Agglutinate neodymium-iron-boron magnet is preparation like this:
At first above each raw material is mixed after according to the proportioning accurate weighing, be blended in common mixer and carry out, incorporation time 4-5 minute.
Adopt the roll-type mixing roll to carry out in the material after above mixing mixing, 260 ℃～270 ℃ of melting temperatures are higher than the melting temperature of binding resin.Mixing time is with 40kg～42kg per hour.After mixing, obtain being applicable to prepare the granular composition of isotropic Agglutinate neodymium-iron-boron magnet, the composition average grain diameter is at 2～3mm.
Again above-mentioned granular composition is sent in extruder by the extrusion shaper feed arrangement, heating makes the composition melting, 260 ℃～270 ℃ of heating-up temperatures, higher than the melting temperature of binding resin, extruder inside is 5MPa～6Mpa to the melting charge applied pressure.Fused mass passes through mould successively under the effect that extruder is exerted pressure, then cooling, is shaped at last, after cutting, obtain isotropic Agglutinate neodymium-iron-boron magnet, its cross sectional shape such as Fig. 2, length is 310mm, and flexibility is 0.25mm along its length, is applicable to the printer of A3 breadth.The magnetic energy product of product is 8MGOe, and Br is 630mT.
The resulting magnetic roller of the present embodiment is to equip like this.
With the isotropism Agglutinate neodymium-iron-boron magnet of preparation with after ferrite permanent magnet magnetizes as requested, according to the pole configuration requirement, be that fan-shaped block magnet is bonded in fixed central spindle with each cross section, obtain magnetic roller as shown in Figure 3.
A kind of magnetic roller, structure such as Fig. 4 are provided with 4 magnetic poles, and four magnetic pole sections are comprised of isotropic Agglutinate neodymium-iron-boron magnet.11 is the mandrel of magnetic roller.
Magnetic pole N1, S1, N2, S2 are comprised of isotropic Agglutinate neodymium-iron-boron magnet, and each component proportion of described magnet is as follows: (weight)
Agglutinate neodymium-iron-boron class permanent magnetism powder 60%,
Ferrite permanent-magnet powder 30%
Binding resin 10%
Said Agglutinate neodymium-iron-boron class permanent magnetism powder, the particle diameter of raw material is about 70～100 μ m;
The ferromagnetic oxide powder particle diameter is 0.9～1.5 μ m;
Binding resin is selected from NYLON610, nylon 66 and nylon 12, and the part by weight of NYLON610, nylon 66 and nylon 12 is 2: 1: 1;
Said isotropic Agglutinate neodymium-iron-boron magnet is preparation like this:
At first above each raw material is mixed after according to the proportioning accurate weighing, be blended in common mixer and carry out, incorporation time 4-5 minute.
Adopt the roll-type mixing roll to carry out in the material after above mixing mixing, 260 ℃～270 ℃ of melting temperatures are higher than the melting temperature of binding resin.Mixing time is with 40kg～42kg per hour.After mixing, obtain being applicable to prepare the granular composition of isotropic Agglutinate neodymium-iron-boron magnet, the composition average grain diameter is at 2～3mm.
Again above-mentioned granular composition is sent in extruder by the extrusion shaper feed arrangement, heating makes the composition melting, 260 ℃～270 ℃ of heating-up temperatures, higher than the melting temperature of binding resin, extruder inside is 6MPa～7Mpa to the melting charge applied pressure.Fused mass passes through mould successively under the effect that extruder is exerted pressure, then cooling, is shaped at last, after cutting, obtain isotropic Agglutinate neodymium-iron-boron magnet, its cross sectional shape such as Fig. 2, length is 910mm, and flexibility is 0.90mm along its length, is applicable to the printer of A0 breadth.The magnetic energy product of product is 7MGOe, and Br is 610mT.
The resulting magnetic roller of the present embodiment is to equip like this.
With the isotropism Agglutinate neodymium-iron-boron magnet of preparation with after ferrite permanent magnet magnetizes as requested, according to the pole configuration requirement, be that fan-shaped block magnet is bonded in fixed central spindle with each cross section, obtain magnetic roller as shown in Figure 4.
Claims (18)
1. isotropic Agglutinate neodymium-iron-boron magnet, consisted of by rare earth permanent magnet powder and binding resin, the weight content of rare earth permanent magnet powder is 90～96%, the weight content of binding resin is 4%～10%, wherein rare earth permanent magnet powder is the mixture of neodymium iron boron class magnetic and ferromagnetic oxide powder, binding resin is polyamide, and the shaping magnet length is 210mm～910mm.
2. isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: the shaping magnet is the mm of flexibility≤(L/1000) along its length, and wherein L is the length of magnet.
3. isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: the residual magnetic flux density Br of magnet is 600～720mT, more than (BH) max reaches 7MGOe.
4. isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: the percentage by weight of NdFeB magnetic powder and ferromagnetic oxide powder is 2～9: 1.
5. isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: the weight content of binding resin is 4%～7%.
6. isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: the particle diameter of cohesive neodymium iron boron magnetic particle is 50-100 μ m.
7. isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: the particle diameter of ferromagnetic oxide powder is 0.5-3 μ m.
8. isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: ferromagnetic oxide powder is barium ferrite or strontium ferrite magnetic powder.
9. isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: polyamide is one or more in nylon 6, nylon 12, nylon 6-12, nylon 66 and nylon 6-10.
10. isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: the shape of cross section of magnet is fan-shaped or rectangle.
11. the preparation method of the described isotropic Agglutinate neodymium-iron-boron magnet of claim 1～10 comprises the steps:
A, at first above each raw material is mixed according to proportioning;
B, will more than raw material after mixing mixing, obtain granular composition;
C, above-mentioned granular composition is sent in extruder, heating makes the composition melting, more successively by mould, then cooling, be shaped at last, form Len req and shape after cutting.
12. the preparation method of isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 11 is characterized in that: step a carries out in mixer, incorporation time 3-5 minute.
13. the preparation method of isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 11 is characterized in that: it is mixing that step b adopts two axle mixing rolls, roll-type mixing roll or kneader to carry out, and melting temperature is at 200～270 ℃.
14. the preparation method of isotropic Agglutinate neodymium-iron-boron magnet as claimed in claim 11 is characterized in that: in step c, the temperature of heating and melting is 200 ℃～270 ℃, and extruder inside is 6MPa～10Mpa to the melting charge applied pressure.
15. a magnetic roller comprises mandrel and be fixed on permanent magnet pole on axle that the quantity of its magnetic pole is N, N is the integer greater than 2, it is characterized in that, wherein at least one magnetic pole contains just like the described isotropic Agglutinate neodymium-iron-boron magnet of claim 1～10.
16. magnetic roller as claimed in claim 15 is characterized in that: number of magnetic poles N:4≤N≤8.
17. magnetic roller as claimed in claim 15 is characterized in that: magnetic pole is bonded on mandrel by the method for bonding, uses resin filling between each magnetic pole, and total becomes elongate cylindrical shape.
18. magnetic roller as claimed in claim 15, it is characterized in that: the ferrite permanent magnet magnetic pole closely is fixed on mandrel, be provided with a groove in the ferrite permanent-magnet surface, isotropic Agglutinate neodymium-iron-boron magnet is fixed in groove, and isotropic Agglutinate neodymium-iron-boron magnet forms separately one or more magnetic poles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810042620 CN101673606B (en) | 2008-09-08 | 2008-09-08 | Isotropic bonded NdFeB magnet and magnetic roller consisting of same |
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| CN 200810042620 CN101673606B (en) | 2008-09-08 | 2008-09-08 | Isotropic bonded NdFeB magnet and magnetic roller consisting of same |
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| CN101673606A CN101673606A (en) | 2010-03-17 |
| CN101673606B true CN101673606B (en) | 2013-06-12 |
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| FR2997221B1 (en) * | 2012-10-22 | 2016-01-01 | Valeo Equip Electr Moteur | HYBRID MAGNET, METHOD FOR MANUFACTURING A HYBRID MAGNET, AND ROTATING ELECTRIC MACHINE COMPRISING SUCH HYBRID MAGNETS |
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| CN106938332B (en) * | 2017-04-26 | 2019-03-15 | 北京科技大学 | A kind of method that the printing of 3D gel prepares neodymium iron boron magnetic body |
| CN108132296B (en) * | 2017-11-09 | 2021-09-21 | 宁波恒信工程检测有限公司 | Magnetic leakage detection device for storage tank |
| CN112164575B (en) * | 2020-09-28 | 2022-06-24 | 中钢天源股份有限公司 | Manufacturing method of small-size sintered neodymium-iron-boron multi-pole magnetic ring |
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