CN102103925A - Method and mold capable of controlling orientation of magnetic field in molding cavity - Google Patents
Method and mold capable of controlling orientation of magnetic field in molding cavity Download PDFInfo
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- CN102103925A CN102103925A CN 200910258142 CN200910258142A CN102103925A CN 102103925 A CN102103925 A CN 102103925A CN 200910258142 CN200910258142 CN 200910258142 CN 200910258142 A CN200910258142 A CN 200910258142A CN 102103925 A CN102103925 A CN 102103925A
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Abstract
The invention discloses a method capable of controlling the orientation of a magnetic field in a molding cavity, which comprises the steps: a low-magnetoconductivity area is formed on at least one of an upper punch and a lower punch and used as the pressing end part of the upper punch and/or the lower punch so as to gather magnetic lines of force to the middle part of a working face of a pressed magnetic shoe to enable the magnetic field formed in the magnetic shoe to be distributed normally, wherein the magnetoconductivity of the area is smaller than 5 H/m. The invention also provides a mold capable of controlling the orientation of the magnetic field in the molding cavity. In the method disclosed by the invention, the upper punch or the lower punch is compounded with the low-magnetoconductivity area, which has a changeable magnetic path and is used as the pressing end part of the upper punch or the lower punch as so to control the orientation of the magnetic field in the molding cavity of the mold to achieve the purpose of controlling the orientation of magnetic field of the magnetic shoe, thus the magnetic lines of force are gathered to the middle part of the working surface of the pressed magnetic shoe. The magnetic shoe produced by pressing with the method has the advantage of better distribution of magnetic field, thus the problems of jitter and high noise of a motor caused by usage of the magnetic shoe can be avoided.
Description
Technical field
The present invention relates to a kind of mould that can be controlled to the method for die cavity internal magnetic field orientation and adopt this method made, be applicable to production mould, the especially production mould of wet type sintering anisotropy magnetic shoe of sintering anisotropy magnetic shoe.
Background technology
As shown in Figure 1, the production mould of traditional sintering anisotropy ferrite magnetic shoe mainly comprises: bottom punch base plate 7, bottom punch 6, forming cavity position 5, upper punch 2 and board upper bed-plate 1.In the forming process, the trend in magnetic field is: central shaft 8 → bottom punch base plate 7 → bottom punch 6 → forming cavity position 5 → upper punch, 2 → board upper bed-plate 1, and get back to central shaft 8 through board as the loop more at last, thereby form the magnetic loop of a closure.
Poor by the prepared sintering anisotropy ferrite magnetic shoe magnetic field orientating that comes out of this method, the gap magnetic field skewness that causes magnet to provide uses the motor shake of this magnetic shoe big, noise is serious, and working life is short.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of mould that can be controlled to the method for die cavity internal magnetic field orientation and adopt this method made, can improve the magnet gap Distribution of Magnetic Field, thereby avoids because of using this magnetic shoe to cause motor shake and the big problem of noise.
In order to address the above problem, the invention provides a kind of method that can be controlled to die cavity internal magnetic field orientation is: wherein form the low permeability zone at least one at upper punch and bottom punch, compacting end as described upper punch and/or bottom punch, so that the magnetic line of force is assembled in the middle of the working face of downtrodden magnetic shoe, the magnetic field that described magnetic shoe is formed is normal distribution; Wherein, the permeability in described zone is less than 5 henry/rice.
Preferably, described low permeability zone is made by 7Mn15Cr2Al3V2WMo nonmagnetic steel or 1Cr18Ni9Ti stainless steel.
The present invention also provides a kind of mould that can be controlled to die cavity internal magnetic field orientation, comprising:
Mould bases;
Cavity plate is arranged on the described mould bases, and described cavity plate has the forming cavity position;
Bottom punch is set in the described forming cavity position;
Upper punch is arranged on the described cavity plate;
Wherein be formed with the low permeability zone at least one at described upper punch and bottom punch, compacting end as described upper punch and/or bottom punch, so that the magnetic line of force is assembled in the middle of the working face of downtrodden magnetic shoe, the magnetic field that described magnetic shoe is formed is normal distribution; Wherein, the permeability in described zone is less than 5 henry/rice.
Preferably, the cross section of described zone and described upper punch or the contacted end face of bottom punch is circular, trapezoidal and rectangle.
Preferably, described low permeability zone is made by 7Mn15Cr2Al3V2WMo nonmagnetic steel or 1Cr18Ni9Ti stainless steel.
The present invention is by the compound zone that can change the low permeability of magnetic circuit on upper punch or bottom punch, compacting end as upper punch or bottom punch, thereby can control magnetic field, position, mould molding chamber trend, reach control magnetic shoe magnetic field orientating, so that the magnetic line of force is assembled in the middle of the working face of downtrodden magnetic shoe, the magnetic field that magnetic shoe is formed is normal distribution.Have better Distribution of Magnetic Field by the magnetic shoe that the present invention suppressed out, thereby can avoid because of using this magnetic shoe to cause motor shake and the big problem of noise.
Description of drawings
Fig. 1 moves towards schematic diagram for the structure and the magnetic field of existing mould;
Fig. 2 moves towards schematic diagram for the structure and the magnetic field of mould of the present invention;
Fig. 3 a is the cross sectional representation of an example in the zone of low permeability in the present invention, and Fig. 3 b is another routine cross sectional representation in the zone of low permeability in the present invention, and Fig. 3 c is the cross sectional representation of an example again in the zone of low permeability in the present invention; Fig. 3 d is the cross sectional representation of an example in the zone of low permeability under the present invention, and Fig. 3 e is another routine cross sectional representation in the zone of low permeability under the present invention;
Fig. 4 a is that the embodiment of the invention 2 does not add the surperficial magnetic value distribution map that loads the magnetic shoe of being suppressed in the low permeability zone, and Fig. 4 b is the surperficial magnetic value distribution map that the embodiment of the invention 2 adds down the magnetic shoe of being suppressed in the low permeability zone.
Reference numeral
1---the board upper bed-plate;
2---upper punch;
3---cavity plate;
4---mould bases;
5---the forming cavity position;
6---bottom punch;
7---the bottom punch base plate;
8---central shaft;
10---go up the low permeability zone;
11---following low permeability zone.
Embodiment
The present invention is by changing the mould magnetic circuit, change composite construction into by traditional structure, move towards thereby control magnetic field, position, mould molding chamber, reaching the purpose of control magnetic shoe magnetic field orientating.
The present invention is described in detail below in conjunction with accompanying drawing.
The present invention is different with traditional mould to be: as shown in Figure 2, upper and lower stamping 2,6 has installed low permeability zone 10 and following low permeability zone 11 on the composite element of being made by low-permeability material additional, for example, adopt 7Mn15Cr2Al3V2WMo nonmagnetic steel or 1Cr18Ni9Ti stainless steel etc.(magnetic permeability mu of composite material is about 1 henry/rice because the magnetic permeability of composite material is than 45# steel low many, and the magnetic permeability mu of 45# steel reaches 300 henries/more than the rice), computing formula according to magnetic resistance Rm: Rm=l/ μ s, obviously, it is bigger than the local magnetic resistance of pure 45# to have added the place of composite element.Like this, magnetic circuit trend also be intensive to the little local magnetic field of magnetic resistance, that magnetic resistance is big is local sparse.Therefore, we just can reach the distribution that changes magnetic resistance in the mould molding chamber by the shape that changes the upper and lower stamping composite material of mould, further control magnetic shoe field orientation purpose is about to the magnetic line of force and assembles in the middle of the working face of magnetic shoe, thereby improves the effective magnetic field intensity of magnetite; Magnetic shoe magnetic field is normal distribution.
The magnetic shoe of suppressing out by the mould with These characteristics is after installation, and the motor shake is little, noise is low, long working life.
Shown in Fig. 3 a, 3b, 3c, three kinds of forms commonly used of upper punch 2 composite materials of mould of the present invention are respectively circular, trapezoidal and rectangle with the cross section of upper punch 2 contacted end faces.A, b, c, d, be die size numerical value respectively, its big I changes within the specific limits: a＜b≤2a, 1.2c≤d≤10c.Shown in Fig. 3 d, 3e, be that lower mould of the present invention dashes two kinds of forms commonly used of 6 composite materials, with the cross section of bottom punch 6 contacted end faces be circular and anti-circle.A, b, c, d, be die size numerical value respectively, its big I changes within the specific limits: 0.5a≤c≤2b, 3mm≤d≤45mm.
Embodiment 1:
Adopt traditional moulds to produce product (being called for short the tradition product) and the embodiment of the invention 1 die production product, the properties of product contrast is as follows:
Table one: the performance comparison of tradition product and present embodiment 1 product
Table two: installation rear motor performance comparison
Embodiment 2:
Shown in Fig. 4 a, 4b, be the surperficial magnetic value distribution schematic diagram that does not add down low permeability zone 11 and add down the magnetic shoe that regional 11 mades of low permeability come out.As shown in the figure, the prepared magnetic shoe that comes out of present embodiment has better Distribution of Magnetic Field.
Table three: installation back performance comparison
Present embodiment to upper mould dash 2 and the structure of bottom punch 6 all improve, shown in Fig. 3 c and Fig. 3 d, the cross section of last low permeability zone 10 end faces that contact with upper punch 2 is a rectangle, concrete specification is: a=35.51mm, b=39.51mm, c=9.15mm, d=15, last low permeability zone 10 adopts the 7Mn15Cr2Al3V2WMo nonmagnetic steel to make, following low permeability zone 11 is circular with the cross section of the end face of bottom punch 6, and concrete specification is: a=36.1mm, R (b)=14.8mm, R (c)=25.2mm, d=10.46mm.Following low permeability zone 11 adopts the 1Cr18Ni9Ti stainless steel to make.The product that adopts present embodiment to produce, specification (unit: mm): (R16.9～R12.1) * 37～30.
Table four: tradition product and the contrast of embodiment 3 properties of product
Table five: installation rear motor performance comparison
In sum; being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention, therefore; all any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. one kind can be controlled to the method that the die cavity internal magnetic field is orientated, be wherein to form the low permeability zone at least one at upper punch and bottom punch, compacting end as described upper punch and/or bottom punch, so that the magnetic line of force is assembled in the middle of the working face of downtrodden magnetic shoe, the magnetic field that described magnetic shoe is formed is normal distribution; Wherein, the permeability in described zone is less than 5 henry/rice.
2. the method for claim 1 is characterized in that, described low permeability zone is made by 7Mn15Cr2Al3V2WMo nonmagnetic steel or 1Cr18Ni9Ti stainless steel.
3. one kind can be controlled to the mould that the die cavity internal magnetic field is orientated, and comprising:
Mould bases;
Cavity plate is arranged on the described mould bases, and described cavity plate has the forming cavity position;
Bottom punch is set in the described forming cavity position;
Upper punch is arranged on the described cavity plate;
It is characterized in that, wherein be formed with the low permeability zone at least one at described upper punch and bottom punch, as the compacting end of described upper punch and/or bottom punch, so that the magnetic line of force is assembled in the middle of the working face of downtrodden magnetic shoe, the magnetic field that described magnetic shoe is formed is normal distribution; Wherein, the permeability in described zone is less than 5 henry/rice.
4. mould as claimed in claim 3 is characterized in that, the cross section of described zone and described upper punch or the contacted end face of bottom punch is circular, trapezoidal and rectangle.
5. as claim 3 or 4 described moulds, it is characterized in that described low permeability zone is made by 7Mn15Cr2Al3V2WMo nonmagnetic steel or 1Cr18Ni9Ti stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910258142 CN102103925B (en) | 2009-12-16 | 2009-12-16 | Method and mold capable of controlling orientation of magnetic field in molding cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910258142 CN102103925B (en) | 2009-12-16 | 2009-12-16 | Method and mold capable of controlling orientation of magnetic field in molding cavity |
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| Publication Number | Publication Date |
|---|---|
| CN102103925A true CN102103925A (en) | 2011-06-22 |
| CN102103925B CN102103925B (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910258142 Active CN102103925B (en) | 2009-12-16 | 2009-12-16 | Method and mold capable of controlling orientation of magnetic field in molding cavity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104552572A (en) * | 2014-12-25 | 2015-04-29 | 安徽金寨将军磁业有限公司 | Coordination method for working surfaces of upper die and medium die of permanent magnetic ferrite tile die |
| CN106925778A (en) * | 2015-12-30 | 2017-07-07 | 上海三环磁性材料有限公司 | A kind of anisotropic bonded magnet planar orientation mould |
-
2009
- 2009-12-16 CN CN 200910258142 patent/CN102103925B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104552572A (en) * | 2014-12-25 | 2015-04-29 | 安徽金寨将军磁业有限公司 | Coordination method for working surfaces of upper die and medium die of permanent magnetic ferrite tile die |
| CN106925778A (en) * | 2015-12-30 | 2017-07-07 | 上海三环磁性材料有限公司 | A kind of anisotropic bonded magnet planar orientation mould |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102103925B (en) | 2013-01-16 |
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Address after: No. 8 Longwan Road, Jiangmen, Guangdong Patentee after: Guangdong led Limited by Share Ltd Address before: No. 8 Longwan Road, Jiangmen, Guangdong Patentee before: JPMF Guangdong Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200811 Address after: No. 359, Jinou Road, Jianghai District, Jiangmen City, Guangdong Province:282 Nanshan Road, Jianghai District, Jiangmen City; 126 Gaoxin West Road, Jianghai District, Jiangmen City) No. 359, Jinou Road, Jianghai District, Jiangmen City, Guangdong Province (place of business: No. 282, Nanshan Road, Jianghai District, Jiangmen City; No. 126, Gaoxin West Road, Jianghai District, Jiangmen City) Patentee after: Jiangmen Jiangyi magnetic material Co.,Ltd. Address before: 529000 No. 8, Longwan Road, Jiangmen, Guangdong Patentee before: Guangdong led Limited by Share Ltd. |