CN101847914A - Production technology of hemimorphic square loop sintered ferrite magnetic steel - Google Patents
Production technology of hemimorphic square loop sintered ferrite magnetic steel Download PDFInfo
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- CN101847914A CN101847914A CN201010135039A CN201010135039A CN101847914A CN 101847914 A CN101847914 A CN 101847914A CN 201010135039 A CN201010135039 A CN 201010135039A CN 201010135039 A CN201010135039 A CN 201010135039A CN 101847914 A CN101847914 A CN 101847914A
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- hemimorphic
- sintered ferrite
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Abstract
A production technology of hemimorphic square loop sintered ferrite magnetic steel relates to a production technology of magnetic steel. The production technology comprises the following steps: processing powder, pelleting, forming in magnetic field, sintering, grinding and magnetizing for test. The production technology is simple; the production cost and the assembly cost are less; the product has no air-gap and stable performance; the performance of the electric motor can be greatly improved, the service life of the electric motor can be prolonged and the development of the DC brushless motor can be promoted.
Description
Technical field:
The present invention relates to a kind of production technology of magnet steel, be specifically related to a kind of production technology of hemimorphic square loop sintered ferrite magnetic steel.
Background technology:
The most original definition of magnet steel promptly is alnico alloy (magnet steel AlNiCo in English is the abbreviation of aluminium nickel cobalt), and magnet steel is by several hard strong metals, and is synthetic as iron and aluminium, nickel, cobalt etc., is that copper, niobium, tantalum are synthetic sometimes, is used for making the exceptional hardness permanent-magnet alloy.The formation difference of its metal ingredient, the magnetic property difference, thus purposes is also different, is mainly used in fields such as various transducers, instrument, electronics, electromechanics, medical treatment, teaching, automobile, aviation, military technology.Alnico magnet is the most ancient a kind of magnet steel, is called natural magnet by people, though he is the most ancient, the adaptability to high temperature that he is outstanding makes it be still one of most important magnet steel so far.Aluminium nickel cobalt can be under the high temperature more than 500 ℃ operate as normal, this is the characteristics of his maximum, also the magnet than other is strong for corrosion resistance in addition.
Ferrite magnetic steel is most widely used a kind of permanent magnetic material, with the powder metallurgic method manufacturing, mainly be divided into two kinds in barium material (Ba) and strontium material (Sr), and be divided into anisotropy and isotropism two classes, be to be difficult for the uncorruptible a kind of permanent magnetic material of demagnetization, maximum operating temperature can reach 250 ℃, and is harder and crisp, instrument cutting processing such as available diamond sand are with the mould one-shot forming of alloy processing just.This series products is widely used in magneto (Motor) and loud speaker fields such as (Speaker).
And in recent years, Nd-Fe-B magnet steel has been widely used in fields such as information technology, automobile, nulcear magnetic resonance (NMR), wind power generation and motor as the rising industry of energy-conserving and environment-protective, and the compound growth rate of estimating following 3-5 is about 20%.Because China has tangible resource, cost and the market advantage, world's neodymium iron boron industry shifts to China, and Chinese neodymium iron boron output had accounted for more than 70% of global output in 2005.The multipole magnetite of conventional circular utilizes multi-disc magnet steel gummed to form, and because of its finished product easily produces the serious leakage field of air gap, influences motor performance.
Summary of the invention:
The purpose of this invention is to provide a kind of production technology of hemimorphic square loop sintered ferrite magnetic steel, its technology is simple, and the production and assembly cost is few, product does not have air gap, and stable performance can increase substantially motor properties, prolong the useful life of motor, promote the development of DC Brushless Motor.
In order to solve the existing problem of background technology, the present invention is by the following technical solutions: its production technology is: the powder processing procedure → granulation → pressing under magnetic field → sintering → grind → test of magnetizing.
Described powder making technology is: the prescription exploitation.
Described prilling is: granulating technique exploitation and the assessment of orientation degree.
Described pressing under magnetic field technology is: mold design improvement, orientation field magnetic Circuit Design and database are set up.
Described sintering process is: the control of contraction ratio and magnetic, mechanical strength control.
Described grinding technics is: the control of out of roundness and dimensional tolerance, out of roundness are 28-32 μ m, cylindricity≤0.04mm.
The described test technology that magnetizes is: a magnetic Circuit Design that magnetizes, magnetic field intensity wave analysis ability is set up.
Technology of the present invention is simple, and the production and assembly cost is few, and product does not have air gap, and stable performance can increase substantially motor properties, prolongs the useful life of motor, promotes the development of DC Brushless Motor.
Embodiment:
This embodiment is by the following technical solutions: its production technology is: the powder processing procedure → granulation → pressing under magnetic field → sintering → grind → test of magnetizing.
Described powder making technology is: the prescription exploitation.The calcining material that Bei Kuang is bought places in the ball mill: 1.5 tons of 5-8um calcining raw materials, steel ball 9 tons of (8 * 6 tons of 6.5 * 3 tons+Φ of Φ), 1.8 tons in water and additives, milling time is 16 hours, grinding the back particle diameter is 0.8-0,85%, and additive has following several: CaCO
31.35%, SiO
20.2%, Al
2O
30.4%, H
3P
2O
30.4%.
Described prilling is: granulating technique exploitation and the assessment of orientation degree.Because anisotropy strontium based ferrite orientation face shrinkage is 22%, non-orientation face shrinkage is 13%, and both gaps are so big, when at 1230 ℃ of sintering of high temperature, and promptly because of two kinds of different shrinkages, and generation slight crack or break.Annular magnetite internal diameter all has axle, causes the attenuation of pan feeding wall thickness, so filler is difficult, and the granulation of appropriateness is necessary.But particle diameter too conference influences magnetic characteristic, and relatively the granularity of Shi Heing is 40-60 order/inch.Because through magnetic field orientation prilling, former shrinkage becomes 17% by 22%, so greatly reduces the gap of orientation face and non-orientation face shrinkage.
Described pressing under magnetic field technology is: mold design improvement, orientation field magnetic Circuit Design and database are set up.
Described sintering process is: the control of contraction ratio and magnetic, mechanical strength control.The magnetism characteristic and the temperature of magnetite are closely bound up, and when temperature was too high, remanent magnetism understands height but coercive force reduces, and just in time opposite when temperature is low, the suitable temperature curve and the temperature hold-time of high-temperature region all must be carried out correct selection.Extremely different side's magnetite orientation face grinds number can influence the magnetic characteristic height, when the too big magnetic characteristic of magnetite external diameter reduces (grinding too many); External diameter is too little, out of roundness not enough (grinding not enough).When the mechanical strength of magnetite decision main shaft combines with magnetite injection moulding easily whether, when insufficient strength, magnetite easily breaks, so the raising of eliminating probability influences quality and efficient.
Described grinding technics is: the control of out of roundness and dimensional tolerance, out of roundness are 28-32 μ m, cylindricity≤0.04mm.
The described test technology that magnetizes is: a magnetic Circuit Design that magnetizes, magnetic field intensity wave analysis ability is set up.Because therefore magnetite must position processing in the orientation of when compacting when magnetic, position processing as using Nd-Fe-B permanent magnetic etc.When checking extremely different magnetite, peak value, orientation waveform, total quantity of magnetism number, the demagnetize size that is subjected to foreign current and the specification value of each size etc. that must test surfaces magnetic number density.
This embodiment technology is simple, and the production and assembly cost is few, and product does not have air gap, and stable performance can increase substantially motor properties, prolongs the useful life of motor, promotes the development of DC Brushless Motor.
Claims (7)
1. production technology of hemimorphic square loop sintered ferrite magnetic steel is characterized in that its production technology is: the powder processing procedure → granulation → pressing under magnetic field → sintering → grind → test of magnetizing.
2. production technology of hemimorphic square loop sintered ferrite magnetic steel according to claim 1 is characterized in that described powder making technology is: the prescription exploitation.
3. production technology of hemimorphic square loop sintered ferrite magnetic steel according to claim 1 is characterized in that described prilling is: granulating technique exploitation and the assessment of orientation degree.
4. production technology of hemimorphic square loop sintered ferrite magnetic steel according to claim 1 is characterized in that described pressing under magnetic field technology is: mold design improvement, orientation field magnetic Circuit Design and database are set up.
5. production technology of hemimorphic square loop sintered ferrite magnetic steel according to claim 1 is characterized in that described sintering process is: the control of contraction ratio and magnetic, mechanical strength control.
6. production technology of hemimorphic square loop sintered ferrite magnetic steel according to claim 1 is characterized in that described grinding technics is: the control of out of roundness and dimensional tolerance, out of roundness are 28-32 μ m, cylindricity≤0.04mm.
7. production technology of hemimorphic square loop sintered ferrite magnetic steel according to claim 1 is characterized in that the described test technology that magnetizes is: a magnetic Circuit Design that magnetizes, magnetic field intensity wave analysis ability is set up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010135039A CN101847914A (en) | 2010-03-30 | 2010-03-30 | Production technology of hemimorphic square loop sintered ferrite magnetic steel |
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| CN201010135039A CN101847914A (en) | 2010-03-30 | 2010-03-30 | Production technology of hemimorphic square loop sintered ferrite magnetic steel |
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| CN101847914A true CN101847914A (en) | 2010-09-29 |
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| CN201010135039A Pending CN101847914A (en) | 2010-03-30 | 2010-03-30 | Production technology of hemimorphic square loop sintered ferrite magnetic steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115547668A (en) * | 2022-11-04 | 2022-12-30 | 惠州市高斯强电子有限公司 | Processing technology of circular ring magnetic steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797625A (en) * | 2004-12-30 | 2006-07-05 | 秀波电子股份有限公司 | Method for fabricating direction matched magnet in profiled square inner diameter of annular ferrite magnetic pole, and structure |
-
2010
- 2010-03-30 CN CN201010135039A patent/CN101847914A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797625A (en) * | 2004-12-30 | 2006-07-05 | 秀波电子股份有限公司 | Method for fabricating direction matched magnet in profiled square inner diameter of annular ferrite magnetic pole, and structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115547668A (en) * | 2022-11-04 | 2022-12-30 | 惠州市高斯强电子有限公司 | Processing technology of circular ring magnetic steel |
| CN115547668B (en) * | 2022-11-04 | 2023-11-28 | 惠州市高斯强电子有限公司 | Circular ring magnetic steel processing technology |
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Application publication date: 20100929 |