CN101599333B - Method for manufacturing anisotropic multi-pole magnetic ring through dry-press forming - Google Patents
Method for manufacturing anisotropic multi-pole magnetic ring through dry-press forming Download PDFInfo
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- CN101599333B CN101599333B CN2009103019028A CN200910301902A CN101599333B CN 101599333 B CN101599333 B CN 101599333B CN 2009103019028 A CN2009103019028 A CN 2009103019028A CN 200910301902 A CN200910301902 A CN 200910301902A CN 101599333 B CN101599333 B CN 101599333B
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Abstract
The invention relates to the field of magnetic materials, in particular to a method for manufacturing an anisotropic multi-pole magnetic ring through dry-press forming. Aiming at the problem that the multi-pole magnetic ring manufactured by the prior art through the dry-press forming is easy to crack, has low yield and the like, the invention provides the method for manufacturing the anisotropic multi-pole magnetic ring through the dry-press forming, and for the multi-pole magnetic ring manufactured by the method, the surface magnetism is more than 1,500 Gs, the Br is more than 3,600 Gs, and the Hcb is more than 3,000 Oe. The aim of the invention is achieved through the following technical proposal: performing wet method pulverization on magnetic powder; adding more than one binding agent and lubricating agent into the magnetic powder which is dried; then performing prepressing and pre-magnetization on the mixture, and then performing a mixing process for mixing the mixture by using a high-speed disintegrator; performing a double-sided equal pressure forming process on the powder in a radial magnetic field; and performing a sintering process for sintering the formed sample, wherein the magnetic powder contains a pre-sintering material and an additive.
Description
Technical field
The present invention relates to field of magnetic material, especially relate to a kind of manufacture method of anisotropic multi-pole magnetic ring through dry-press forming.
Background technology
Multi-pole magnet-ring is two utmost points or two utmost points being commonly called as with upper rotor part.Anisotropic permanent-magnet ferrite multi-pole magnet-ring has widely-used in fields such as convertible frequency air-conditioner motor, mahjong machine, washing machine, Oil pump electrical machinery, servomotor and stepping motors, Figure 1 shows that the multipole anisotropic permanent-magnet ferrite of cylindrical multi-pole magnet-ring, Fig. 2 is the multipole anisotropic permanent-magnet ferrite of an interior circle multi-pole magnet-ring.The manufacturing process of anisotropic permanent-magnet ferrite multi-pole magnet-ring mainly contains two kinds of methods at present, the first adopts traditional wet therapy forming process, promptly adopt the axial orientation moulding process, this process using be the compacting square ferrite magnetic patch, and then cutting, the technology of trepanning, though this technology performance and rate of finished products are all very high, owing to be the axial orientation moulding, the table magnetic variation of top and bottom is original just very big, table magnetic variation between its pole-face reaches 200Gs or bigger, in magneto, can not use, even solved later the problem of pole-face table magnetic variation, because it increases cutting, technologies such as trepanning have just increased production cost virtually, product lacks the market competitiveness, and the concrete application of this scheme is not a lot of at present.It two is to adopt the moulding of dry-pressing radial magnetic field, owing to lack necessary decentralized medium between the particle in the dry mash, dry-pressing formed orientation in the pressing under magnetic field process is relatively poor, is to improve the degree of orientation to adopt add an amount of organic bond in powder.A kind of manufacture method that relates to dry-pressing formed permanent-magnet ferrite is disclosed as Chinese patent application (application number 02803279.9), when being dry-pressing formed, its core added the adhesive of a kind of molecular weight at 400～600 fatty acid series wax, thereby effectively improved the flowability of powder particle, obtained higher magnetic property.But because the height of general radial multi-pole magnetic ring is more a lot of than big with diameter, shrink when when compacting, having the upper and lower end face at sintering inconsistent, thereby produce cracking, rate of finished products is extremely low.
The present invention just is being based on this actual conditions proposition, purpose is on the basis of good pre-burning material formula, by process modification, select suitable organic bond and suitable addition, effectively improve the orientation of dry-pressing powder, adopt the precompressed premagnetization, the radial oriented moulding process of two-way equipressure, prepare the high radial multi-pole permanent-magnetic oxyferrite magnetic ring of performance, its magnetic property: table magnetic is greater than 1500Gs, Br is greater than 3600Gs, and Hcb is greater than 3000Oe.
Summary of the invention
Easy to crack when the present invention is directed to the dry-pressing formed manufacturing multi-pole magnet-ring of prior art, problem such as rate of finished products is low, a kind of manufacture method of anisotropic multi-pole magnetic ring through dry-press forming is provided, the multi-pole magnet-ring table magnetic that it makes is greater than 1500Gs, and Br is greater than 3600Gs, and Hcb is greater than 3000Oe.
The objective of the invention is to be implemented by the following technical programs:
Magnetic powder is carried out waterproof pulverization; Add more than one adhesive and lubricant in the magnetic powder after drying; Carry out the precompressed premagnetization then, the mixed processes that adopts high speed disintegrator to mix again; Carry out the two-sided isotactic pressing operation of aforementioned powder in radial magnetic field; Carry out sintering circuit to the sample sintering after the moulding; Described magnetic powder comprises pre-imitation frosted glass and additive.
The selected pre-imitation frosted glass magnet powder of the present invention comprises the Hxagonal ferrite principal phase that contains A, R, B and Fe, and has the molecular formula of following feature: A
1～xR
x[(Fe
3+ aFe
2+ b)
12～yB
y]
zO
19, wherein, A represents one or both elements among Sr, the Ba; The R representative is selected from least a element among rare earth element and the Bi, and must contain La; B represents at least a element among Co, Ti, Mn, Zn, Ge, As and the W, wherein must contain Co, and the chemical valence of Co element is positive trivalent; Wherein, a+b equals 1; Z is preferably 0.9～1.1; A is preferably 0.97～0.999, and b is preferably 0.001～0.03; Described x and y preferable range are: 0≤x≤0.54,0≤y≤0.45, and the best value of preferred x, y, z is; 1.0≤x/y≤1.5, z is 1.
Except in pre-imitation frosted glass, adding conventional SiO
2, CaCO
3Outside additive, also add at least a organic dispersing agent in polyethylene glycol (PEG), the calcium stearate, addition is 0～1.0wt%.SiO
2, CaCO
3Deng the adding of additive, help to form in the sintering process crystal boundary, hinder growing up of ferrite crystal grains, thereby effectively improve the coercive force of product.The effect of grinding aid is played in the adding of organic dispersing agent on the one hand in crushing process, make that the magnet powder particle diameter after grinding is more even; Performance to the dry-pressing product also increases on the other hand, and especially molecular weight is that about 800 polyethylene glycol (PEG) adds and can improve the HCJ 300～500Oe of product on the basis that does not reduce remanent magnetism.
The adhesive that can add comprises one or more in polyvinyl alcohol, polyethylene glycol (PEG), fatty acid series wax, camphor and the stearate, and addition is 0～1.5wt%.For the ease of fully contacting of adhesive and dry powder, above-mentioned adhesive can dissolve the back with alcohol, acetone and other organic solvent and add, and effect is better.The adding of organic bond, effectively improved the flowability of magnetic powder particle on the one hand, reduced the resistance when powder granule rotates, improved the degree of orientation of magnetic powder particle when dry-pressing formed, thereby the remanent magnetism that improves product there is contribution, based on above-mentioned same reason, organic adding also can cause the decline of product density on the other hand, thus the remanent magnetism of the product that reduces.So the addition of organic bond is extremely important, addition should be controlled at 0～1.5wt%, is preferably 1.0～1.2wt%.
Mixed magnetic is crossed 40～60 mesh sieves.
To through the dry powder after the one or many precompressed premagnetization in above-mentioned radial magnetic field molding procedure, the water content of the dry-pressing magnetic before the moulding is controlled at 0.2～0.5wt%, moulding magnetic field is not less than 8000Oe.
In the precompressed premagnetization, preload pressure 10～25Mpa, premagnetization magnetic field 5000～6500Oe.
The sintering circuit of the sample after the moulding being carried out sintering adopts 45m roller kilns Fast Sintering technology, 300～500 ℃ of processing of coming unstuck, carries out 0.5～2 hour sintering at 1240～1260 ℃.
Material of the present invention compared with prior art has the following advantages:
The inventor proposes to adopt precompressed premagnetization operation first in the technology of making radial permanent magnet ferrite multi-pole magnet-ring, the starting point that adopts precompressed premagnetization technology is that expectation is after one or many precompressed premagnetization, the thick relatively point of the granularity of the powder after high speed disintegrator is pulverized, thereby be convenient to moulding, reduce cracking, and powder is through repeatedly being convenient to improve the degree of orientation after the premagnetization in final radially moulding, and obtains good performance.
The inventor proposes to adopt the bidirectional pressed moulding operation first in the technology of making radial permanent magnet ferrite multi-pole magnet-ring, the purpose that adopts this technology is thicker and cause cracking in order to solve the product height, the density of two end faces is inconsistent up and down in forming process, so in sintering process, just cause the different of shrinkage, thereby produce cracking.The density contrast that adopts the bidirectional pressed moulding operation can solve upper and lower surface is tried one's best consistent, adopts two-sided while pressing mode just can guarantee the consistent in density at product two ends, thereby fundamentally solves the cracking problem of this product.
Adopt the precompressed premagnetization, the radial oriented moulding process of two-way equipressure, prepare the high radial multi-pole permanent-magnetic oxyferrite magnetic ring of performance, its magnetic property: table magnetic is greater than 1500Gs, and Br is greater than 3600Gs, and Hcb is greater than 3000Oe.
Description of drawings
Fig. 1 is the multipole permanent-magnetic oxyferrite magnetic ring of cylindrical.
Fig. 2 is the multipole permanent-magnetic oxyferrite magnetic ring of interior circle.
Embodiment
Below be the specific embodiment of the present invention, technical characterictic of the present invention is described further, but the present invention is not limited to these embodiment.
Embodiment 1:
Base-material employing application number is the prescription in 200510023312.5 (manufacture method of magnet powder, sintered magnet and products thereof) patent, and the pre-burning material package is drawn together the Hxagonal ferrite principal phase that contains A, R, B and Fe, and has the molecular formula of following feature: A
1～ xR
x[(Fe
3+ aFe
2+ b)
12～yB
y]
zO
19, wherein, A represents one or both elements among Sr, the Ba; The R representative is selected from least a element among rare earth element and the Bi, and must contain La; B represents at least a element among Co, Ti, Mn, Zn, Ge, As and the W, wherein must contain Co, and the chemical valence of Co element is positive trivalent; Wherein, a+b equals 1; Z is preferably 0.9～1.1; A is preferably 0.97～0.999, and b is preferably 0.001～0.03; Described x and y preferable range are: 0≤x≤0.54,0.≤y≤0.45.
The concrete technology of its of anisotropic multi-pole magnetic ring through dry-press forming is as follows:
1, ball-milling technology
Earlier permanent ferrite prefiring material is carried out the secondary wet-milling, add the secondary additive as required simultaneously, the secondary ball milling technology during its technology is produced as traditional permanent-magnet ferrite.
2, stoving process
Then the slip behind the secondary sand milling being dried, is to carry out 10～12 hours dryings in 120 ℃ in drying box, and it is dry with kiln drying perhaps this slip to be placed on electrical kiln, in the water content requirement 0.3wt% of the powder after the general requirement oven dry.
3, precompressed premagnetization prilling
Powder after at first will drying mixes with the bonding agent methocel solution, and the bonding agent ratio is 40wt%, magnetizes in magnetic field then, and then oven dry, at last powder is carried out high speed disintegrator and pulverize, and cross 60 mesh sieves, make radially moulding powder of dry-pressing permanent-magnet ferrite.Preload pressure 25Mpa, premagnetization magnetic field 6500Oe.
4, moulding process radially
On 45T experiment press, carry out the moulding of permanent-magnet ferrite radial multi-pole magnetic ring, pressure 3MPa, the water content of the dry-pressing magnetic before the moulding is at 0.2wt%, moulding radial magnetic field 10000Oe.Adopt the mode compression moulding of two-sided isobaric compression moulding.
5, sintering, grinding
Sintering process is identical as the sintering process of present wet pressing product, 300～500 ℃ of processing of coming unstuck, carry out 2 hours sintering of 1250 ℃ of insulations of sintering temperature then, its lime light is to prevent that the organic volatilization in the sintering process from producing the too fast generation cracking of cooling in cracking and the cooling procedure.The box type furnace sintering is adopted in the laboratory, and factory is then with the electrical kiln sintering, and magnetic property and table magnetic are mainly tested in performance test.
Embodiment 2:
The concrete technology of its of anisotropic multi-pole magnetic ring through dry-press forming is as follows:
3, precompressed premagnetization prilling
Powder after at first will drying mixes with the bonding agent methocel solution, and the bonding agent ratio is 40wt%, magnetizes in magnetic field then, and then oven dry, at last powder is carried out high speed disintegrator and pulverize, and cross 60 mesh sieves, make radially moulding powder of dry-pressing permanent-magnet ferrite.Preload pressure 10Mpa, premagnetization magnetic field 5000Oe.
4, moulding process radially
On 45T experiment press, carry out the moulding of permanent-magnet ferrite radial multi-pole magnetic ring, pressure 3MPa, the water content of the dry-pressing magnetic before the moulding is at 0.2wt%, moulding radial magnetic field 10000Oe.Adopt the mode compression moulding of two-sided isobaric compression moulding.
All the other are identical with embodiment 1.
Embodiment 3:
The concrete technology of its of anisotropic multi-pole magnetic ring through dry-press forming is as follows:
3, precompressed premagnetization prilling
Powder after at first will drying mixes with the bonding agent methocel solution, and the bonding agent ratio is 40wt%, magnetizes preload pressure 25Mpa, premagnetization magnetic field 6500Oe then in magnetic field.And then oven dry, at last powder is carried out high speed disintegrator and pulverize, and cross 60 mesh sieves, make radially moulding powder of dry-pressing permanent-magnet ferrite.Carry out the precompressed premagnetization after the oven dry again, preload pressure 25Mpa, premagnetization magnetic field 6500Oe.
4, moulding process radially
On 45T experiment press, carry out the moulding of permanent-magnet ferrite radial multi-pole magnetic ring, pressure 3MPa, the water content of the dry-pressing magnetic before the moulding is at 0.5wt%, moulding radial magnetic field 9000Oe.Adopt the mode compression moulding of two-sided isobaric compression moulding.
Embodiment 4:
The concrete technology of its of anisotropic multi-pole magnetic ring through dry-press forming is as follows:
3, precompressed premagnetization prilling
Powder after at first will drying mixes with the bonding agent methocel solution, and the bonding agent ratio is 40wt%, magnetizes preload pressure 25Mpa, premagnetization magnetic field 5000Oe then in magnetic field.And then oven dry, at last powder is carried out high speed disintegrator and pulverize, and cross 60 mesh sieves, make radially moulding powder of dry-pressing permanent-magnet ferrite.Carry out the precompressed premagnetization after the oven dry again, preload pressure 25Mpa, premagnetization magnetic field 5000Oe.
4, moulding process radially
On 45T experiment press, carry out the moulding of permanent-magnet ferrite radial multi-pole magnetic ring, pressure 3MPa, the water content of the dry-pressing magnetic before the moulding is at 0.2wt%, moulding radial magnetic field 10000Oe.Adopt the mode compression moulding of two-sided isobaric compression moulding.
The comparative example 1:
The employing application number is the method in 200510023312.5, and prescription carries out Wet-pressing molding as embodiment 1.
The comparative example 2:
Do not adopt the precompressed premagnetization prilling of the 3rd step, all the other are identical with embodiment 1.
The comparative example 3:
Do not adopt the precompressed premagnetization prilling of the 3rd step, all the other are identical with embodiment 3.
Table 1 magnetic property and table magnetic
Embodiment illustrates the present invention's spirit.The technical staff of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although the present invention has been made detailed explanation and has quoted some instantiations as proof, to those skilled in the art, only otherwise leave that the spirit and scope of the present invention can be done various variations or correction is obvious.
Claims (6)
1. the method for a dry-pressing formed manufacturing anisotropy multi-pole magnet-ring, its step comprises:
Magnetic powder is carried out waterproof pulverization; Add more than one adhesive and lubricant in the magnetic powder after drying; Described adhesive comprises more than one in polyvinyl alcohol, polyethylene glycol, fatty acid series wax, camphor, the methylcellulose, and addition is 0～1.5wt%,
Carry out the precompressed premagnetization then, in the described precompressed premagnetization step, preload pressure 10～25MPa, premagnetization magnetic field 5000～6500Oe, the mixed processes that adopts high speed disintegrator to mix again;
Carry out the two-sided isotactic pressing operation of aforementioned powder in radial magnetic field, in the described two-sided isotactic pressing operation, the water content of the dry-pressing magnetic before the moulding is at 0.2～0.5wt%, and the moulding radial magnetic field adopts the mode compression moulding of two-sided isobaric compression moulding greater than 9000Oe;
Carry out sintering circuit to the sample sintering after the moulding;
Described magnetic powder comprises pre-imitation frosted glass, and the pre-burning material package is drawn together the Hxagonal ferrite principal phase that contains A, R, B and Fe, and has the molecular formula of following feature: A
1-xR
x[(Fe
3+ aFe
2+ b)
12-yB
y]
zO
19, wherein, A represents one or both elements among Sr, the Ba; The R representative is selected from least a element among rare earth element and the Bi, and must contain La; B represents at least a element among Co, Ti, Mn, Zn, Ge, As and the W, wherein must contain Co, and the chemical valence of Co element is positive trivalent; Wherein, a+b equals 1; Z is 0.9～1.1; A is 0.97～0.999, and b is 0.001～0.03; Described x and y scope are: 0≤x≤0.54,0≤y≤0.45.
2. the method for dry-pressing formed manufacturing anisotropy multi-pole magnet-ring according to claim 1 is characterized in that, described adhesive addition is 1.0～1.2 wt%.
3. the method for dry-pressing formed manufacturing anisotropy multi-pole magnet-ring according to claim 1 is characterized in that described adhesive dissolves with organic solvent.
4. the method for dry-pressing formed manufacturing anisotropy multi-pole magnet-ring according to claim 3 is characterized in that, described organic solvent is alcohol, acetone.
5. the method for dry-pressing formed manufacturing anisotropy multi-pole magnet-ring according to claim 1 is characterized in that, after the described mixed processes, has comprised that also mixed magnetic crosses the step of 40～60 mesh sieves.
6. the method for dry-pressing formed manufacturing anisotropy multi-pole magnet-ring according to claim 1 is characterized in that, described sintering circuit adopts the roller kilns Fast Sintering, comes unstuck at 300～500 ℃, carries out sintering at 1240～1260 ℃.
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| CN101205137A (en) * | 2007-01-18 | 2008-06-25 | 横店集团东磁股份有限公司 | Method for manufacturing sintered permanent magnetic ferrite formed by dry pressing |
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| CN106514843A (en) * | 2016-12-23 | 2017-03-22 | 安徽龙磁科技股份有限公司 | Mold of permanent magnetic ferrite radial direction uniform orientation magnetic ring and manufacturing method of permanent magnetic ferrite radial direction uniform orientation magnetic ring |
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