CN105845424A - Forming method of magnetic ring - Google Patents
Forming method of magnetic ring Download PDFInfo
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- CN105845424A CN105845424A CN201610009870.4A CN201610009870A CN105845424A CN 105845424 A CN105845424 A CN 105845424A CN 201610009870 A CN201610009870 A CN 201610009870A CN 105845424 A CN105845424 A CN 105845424A
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- field
- magnetic field
- magnetic
- orientation
- demagnetization
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a forming method of a magnetic ring. The forming method comprises steps of blank forming and sintering and thermal processing, the step of blank forming comprises magnetizing and pressing and demagnetizing after pressing, in the step of magnetizing and pressing, magnetic powder is arranged in an annular die cavity and is oriented by an orientation magnetic field, the magnetic powder is compacted and formed by stress during orientation to obtain an oriented blank, the orientation magnetic field rotates relative to the magnetic powder in the annular die cavity during orientation, the direction of the demagnetization magnetic field is consistent with the direction of the orientation magnetic field, the field intensity of the demagnetization magnetic field is constant and is smaller than the field intensity of the orientation magnetic field, and in the step of demagnetizing, the oriented blank is demagnetized in the demagnetization magnetic field, and the demagnetization magnetic field rotates relative to the oriented blank in the annular die cavity during demagnetizing. With the scheme disclosed by the invention, the magnet forming efficiency is higher, a gradually-changing magnetic field in the same direction or a reverse magnetic field is not needed, the maneuverability is higher, the forming time is greatly saved, and thus, the production efficiency can be improved.
Description
Technical field
The present invention relates to the forming method of a kind of annular permanent magnet, the forming method of a kind of magnet ring.
Background technology
Neodymium iron boron magnetic body, the intermetallic compound being mainly made up of with ferrum, boron rare-earth element R.R be mainly neodymium or neodymium and other
The combination of rare earth element, the most also replaces part ferrum with elements such as cobalt, aluminum, vanadium.It is broadly divided into sintered NdFeB and bonding neodymium ferrum
Boron two kinds, Agglutinate neodymium-iron-boron all directions are all magnetic, corrosion-resistant；And sintered NdFeB is because of perishable, surface needs coating, one
As have zinc-plated, nickel, zinc electroplating bath, environmental protection nickel, ambrose alloy nickel, environmental protection ambrose alloy nickel etc..And sintered NdFeB typically divide axial charging with
Radial magnetizing, determines according to required work surface.
Nd-Fe-B permanent magnet material is the permanent magnet material based on intermetallic compound RE2FE14B.Be mainly composed of rare earth (RE),
Ferrum (Fe), boron (B).Its middle rare earth ND can be with other rare earth gold such as part dysprosium (Dy), praseodymium (Pr) in order to obtain different performance
Belonging to and substituting, ferrum also can be substituted by other metal parts such as cobalt (Co), aluminum (Al), and the content of boron is less, but to forming four directions
Crystal structure intermetallic compound plays an important role, and the compound made has high saturation and magnetic intensity, high uniaxial anisotropy
With high Curie temperature.
Neodymium iron boron magnetic body is by a kind of new permanent-magnet of Contemporary Japanese scientist Zuo Chuan true man invention, and November 29 nineteen eighty-three
In metal academic discussion, SUMITOMO CHEMICAL particulate metal company neodymium, ferrum, the manufacture of boron permanent magnet material are proposed at first.
It is main by neodymium, ferrum, three kinds of elementary composition alloy magnets of boron, is the permanent magnet that present magnetic is the strongest, because neodymium atom is
Flat, electron cloud limited, make iron atom to offset, thus form constant magnetic force.
Neodymium iron boron magnetic body has the strongest magnetocrystalline anisotropy and the highest saturation magnetization.In permanent magnet material, sintered Nd-Fe-B
Magnet performance is the highest, maximum magnetic energy product (BH) max=360kJ/m3 of commercial product, but the Curie temperature of this magnet relatively low (314 DEG C),
Temperature stability and corrosion resistance are poor, limit and use at relatively high temperatures, and need as a rule to use protective coating.
The manufacturing process of neodymium iron boron magnetic body has powder metallurgic method and melt-quenching method.Because magnetic property is excellent, Nd-Fe-B type magnet obtains
It is widely applied, is mainly used in motor, electromotor, acoustic wave transducer, various sensor, medical apparatus and instruments and magnetic machinery etc..
The annular magnet (be called for short radiation ring) radially oriented along radius or diametric(al) has extensively in the field such as motor, electromotor
Application.The maximum technological difficulties making radiation ring are molding (or die mould) stage orientations to magnetic powder.During orientation, magnetic powder is executed
Adding magnetic field, magnetic powder can arrange along direction of easy axis in magnetic field, utilizes pressure head that magnetic powder is applied pressure simultaneously, makes magnetic powder keep magnetic
Field differently-oriented directivity, is suppressed into the blank that density is about 4～4.5g/cm3 by magnetic powder.If do not demagnetized, then blank is with magnetic
Property can be adhered magnetic powder, simultaneously because blank relatively high magnetism can produce and cause blank to ftracture under magnetic repulsion, serious conditions, and at this moment hair
Base is the most easily inhaled together, affects blank sintering and puts.If it addition, do not demagnetize, mould also has residual magnetic field, residual
When residual magnetism field makes again to add powder, magnetic powder is attracting with mould, causes and adds powder difficulty, therefore uses tradition molding mode to enter
Row demagnetization.Tradition demagnetization is that the magnetic field applying size suitable, in opposite direction makes blank demagnetize.Former and magnetic powder phase during demagnetization
Static for cartridge, simply FR.The method needs to adjust magnetic direction, and first magnetic field be reduced to zero by maximum and then will
Electric current reversely produces opposing magnetic field and demagnetizes molded blank.In practical operation, owing to electric current needs to be reduced to zero by maximum
The most reverse process causes relatively inefficient, affects output.
Summary of the invention
For solving the problems referred to above, the invention discloses the forming method of a kind of magnet ring, by disappearing with in the same direction constant at degaussing phase
Magnetic magnetic field carries out demagnetization to the base substrate after orientation, operates the easiest, and demagnetization efficiency significantly improves.
The forming method of magnet ring disclosed by the invention, including blank forming, sintering heat treatment, blank forming include magnetizing compacting with
And the demagnetization after compacting, magnetize and be compressed to magnetic powder in annular die cavity, alignment magnetic field the magnetic powder in annular die cavity is orientated,
While orientation magnetic powder receive pressure and compaction moulding and obtain being orientated base substrate, during orientation, alignment magnetic field is relative in annular die cavity
Magnetic powder rotates；The direction of erasing field is consistent with the direction of alignment magnetic field, and the field intensity of erasing field is constant and is less than orientation magnetic
The field intensity of field, demagnetization is orientation base substrate demagnetization in erasing field, and during demagnetization, erasing field is relative to the orientation base in annular die cavity
Body rotates.
A kind of improvement of the forming method of magnet ring disclosed by the invention, alignment magnetic field in annular die cavity circumference range be stationary magnetic field,
The magnetic field of regular change or irregular magnetic field.
A kind of improvement of the forming method of magnet ring disclosed by the invention, erasing field is that alignment magnetic field keeps that its direction is constant to reduce
Field intensity obtains.
A kind of improvement of the forming method of magnet ring disclosed by the invention, erasing field is parallel magnetic field or divergent magnetic field.
A kind of improvement of the forming method of magnet ring disclosed by the invention, erasing field is for being provided or by two magnetic sources by a magnetic source
Or two or more magnetic source superposition provides jointly.
A kind of improvement of the forming method of magnet ring disclosed by the invention, the maximum field strength of erasing field is less than or equal to 1T.
In the present invention program, directly change with alignment magnetic field and be adjusted to erasing field, and without using, magnetic direction is adjusted
Or the mode gradually adjusted magnetic field intensity is to obtain erasing field, and use limit field intensity with alignment magnetic field in the same direction
Stationary magnetic field is as erasing field, and while reaching demagnetization purpose, the realization of technical scheme and operation operation are the simplest high
Effect, either the cost of production cost or equipment is the cheapest, production in hgher efficiency, and overall efficiency improves more than 15-30%,
It is more obvious that the most large-scale magnet ring then efficiency improves.
Detailed description of the invention
Below in conjunction with detailed description of the invention, it is further elucidated with the present invention, it should be understood that following detailed description of the invention is merely to illustrate this
Bright rather than limit the scope of the present invention.
Embodiment 1
The forming method of the present embodiment middle magnetic ring, including blank forming, sintering heat treatment, blank forming include magnetizing compacting and
Demagnetization after compacting, magnetizes and is compressed to magnetic powder in annular die cavity, alignment magnetic field be orientated the magnetic powder in annular die cavity,
While orientation magnetic powder be under pressure and compaction moulding and obtain be orientated base substrate, during orientation, alignment magnetic field is relative in annular die cavity
Magnetic powder rotates；The direction of erasing field is consistent with the direction of alignment magnetic field, and the field intensity of erasing field is constant and is less than orientation magnetic
The field intensity of field, demagnetization is orientation base substrate demagnetization in erasing field, and during demagnetization, erasing field is relative to the orientation base in annular die cavity
Body rotates.Depending on the number of turns (angle) the rotated during orientation intensity with technological requirement and alignment magnetic field；Rotate during demagnetization
The number of turns (angle) intensity with technological requirement and erasing field depending on.When orientation or during demagnetization, the number of turns (angle of rotation
Degree) be 15 °, 20 °, 30 °, 45 °, 50 °, 60 °, 120 °, 160 °, 200 °, 250 °, 300 °, 360 °,
2 circles, 2.5 circles, 3 circles etc..
Embodiment 2
The forming method of the present embodiment middle magnetic ring, including blank forming, sintering heat treatment, blank forming include magnetizing compacting and
Demagnetization after compacting, magnetizes and is compressed to magnetic powder in annular die cavity, and alignment magnetic field is stationary magnetic field in annular die cavity circumference range,
By alignment magnetic field, the magnetic powder in annular die cavity is orientated, while orientation magnetic powder be under pressure and compaction moulding and be orientated
Base substrate, during orientation, alignment magnetic field rotates relative to the magnetic powder in annular die cavity；The direction of erasing field and the side of alignment magnetic field
To unanimously, the field intensity of erasing field is constant and field intensity less than alignment magnetic field, and demagnetization is orientation base substrate demagnetization in erasing field,
During demagnetization, erasing field rotates relative to the orientation base substrate in annular die cavity.The number of turns (angle) rotated during orientation is with technique
Require and depending on the intensity of alignment magnetic field；The number of turns (angle) rotated during demagnetization is with technological requirement and the intensity of erasing field
Depending on.When orientation or during demagnetization, the number of turns (angle) of rotation is 15 °, 20 °, 30 °, 45 °, 50 °, 60 °,
120 °, 160 °, 200 °, 250 °, 300 °, 360 °, 2 circles, 2.5 circles, 3 circles etc..
Embodiment 3
The forming method of the present embodiment middle magnetic ring, including blank forming, sintering heat treatment, blank forming include magnetizing compacting and
Demagnetization after compacting, magnetizes and is compressed to magnetic powder in annular die cavity, and alignment magnetic field is regular change in annular die cavity circumference range
The magnetic field (distributed wave that magnetic field (is radially observed) in circumference range is sinusoidal, rectangular-shaped, repetition zigzag etc.) changed,
By alignment magnetic field, the magnetic powder in annular die cavity is orientated, while orientation magnetic powder be under pressure and compaction moulding and be orientated
Base substrate, during orientation, alignment magnetic field rotates relative to the magnetic powder in annular die cavity；The direction of erasing field and the side of alignment magnetic field
To unanimously, the field intensity of erasing field is constant and field intensity less than alignment magnetic field, and demagnetization is orientation base substrate demagnetization in erasing field,
During demagnetization, erasing field rotates relative to the orientation base substrate in annular die cavity.The number of turns (angle) rotated during orientation is with technique
Require and depending on the intensity of alignment magnetic field；The number of turns (angle) rotated during demagnetization is with technological requirement and the intensity of erasing field
Depending on.When orientation or during demagnetization, the number of turns (angle) of rotation is 15 °, 20 °, 30 °, 45 °, 50 °, 60 °,
120 °, 160 °, 200 °, 250 °, 300 °, 360 °, 2 circles, 2.5 circles, 3 circles etc..
Embodiment 4
The forming method of the present embodiment middle magnetic ring, including blank forming, sintering heat treatment, blank forming include magnetizing compacting and
Demagnetization after compacting, magnetizes and is compressed to magnetic powder in annular die cavity, and alignment magnetic field is irregular change in annular die cavity circumference range
(distributed wave that magnetic field (is radially observed) in circumference range is random water waviness, random dentation in the magnetic field changed
Deng), alignment magnetic field the magnetic powder in annular die cavity is orientated, while orientation magnetic powder be under pressure and compaction moulding and obtain
Orientation base substrate, during orientation, alignment magnetic field rotates relative to the magnetic powder in annular die cavity；The direction of erasing field and alignment magnetic field
Direction consistent, the field intensity of erasing field is constant and field intensity less than alignment magnetic field, and demagnetization disappears in erasing field for orientation base substrate
Magnetic, during demagnetization, erasing field rotates relative to the orientation base substrate in annular die cavity.During orientation rotate the number of turns (angle) with
Depending on the intensity of technological requirement and alignment magnetic field；The number of turns (angle) rotated during demagnetization is with technological requirement and erasing field
Depending on intensity.When orientation or during demagnetization, the number of turns (angle) of rotation is 15 °, 20 °, 30 °, 45 °, 50 °,
60 °, 120 °, 160 °, 200 °, 250 °, 300 °, 360 °, 2 circles, 2.5 circles, 3 circles etc..
Embodiment 4
The forming method of the present embodiment middle magnetic ring, including blank forming, sintering heat treatment, blank forming include magnetizing compacting and
Demagnetization after compacting, magnetizes and is compressed to magnetic powder in annular die cavity, alignment magnetic field be orientated the magnetic powder in annular die cavity,
While orientation magnetic powder be under pressure and compaction moulding and obtain be orientated base substrate, during orientation, alignment magnetic field is relative in annular die cavity
Magnetic powder rotates；The direction of erasing field is consistent with the direction of alignment magnetic field, and erasing field is that alignment magnetic field keeps its direction
Constant and reduce field intensity and obtain, the field intensity of erasing field is constant and field intensity less than alignment magnetic field (field intensity such as erasing field is constant
For 0.95 times of field intensity of alignment magnetic field, 0.9 times, 0.8 times, 0.7 times, 0.6 times, 0.5 times, 0.4 times, 0.3 times, 0.2 times,
0.1 times etc.), demagnetization is orientation base substrate demagnetization in erasing field, and during demagnetization, erasing field is relative to the orientation base in annular die cavity
Body rotates.Depending on the number of turns (angle) the rotated during orientation intensity with technological requirement and alignment magnetic field；Rotate during demagnetization
The number of turns (angle) intensity with technological requirement and erasing field depending on.When orientation or during demagnetization, the number of turns (angle of rotation
Degree) be 15 °, 20 °, 30 °, 45 °, 50 °, 60 °, 120 °, 160 °, 200 °, 250 °, 300 °, 360 °,
2 circles, 2.5 circles, 3 circles etc..
Embodiment 5
The forming method of the present embodiment middle magnetic ring, including blank forming, sintering heat treatment, blank forming include magnetizing compacting and
Demagnetization after compacting, magnetizes and is compressed to magnetic powder in annular die cavity, alignment magnetic field be orientated the magnetic powder in annular die cavity,
While orientation magnetic powder be under pressure and compaction moulding and obtain be orientated base substrate, during orientation, alignment magnetic field is relative in annular die cavity
Magnetic powder rotates；The direction of erasing field is consistent with the direction of alignment magnetic field, and erasing field is that alignment magnetic field keeps its direction
Constant and reduce field intensity and obtain, erasing field be parallel magnetic field that field intensity is constant and less than the field intensity of alignment magnetic field (such as erasing field
0.95 times of the constant field intensity for alignment magnetic field of field intensity, 0.9 times, 0.8 times, 0.7 times, 0.6 times, 0.5 times, 0.4 times, 0.3
Times, 0.2 times, 0.1 times etc.), demagnetization is orientation base substrate demagnetization in erasing field, and during demagnetization, erasing field is relative to annular die cavity
In orientation base substrate rotate.Depending on the number of turns (angle) the rotated during orientation intensity with technological requirement and alignment magnetic field；
Depending on the number of turns (angle) the rotated during demagnetization intensity with technological requirement and erasing field.When orientation or during demagnetization, turn
The dynamic number of turns (angle) is 15 °, 20 °, 30 °, 45 °, 50 °, 60 °, 120 °, 160 °, 200 °, 250 °,
300 °, 360 °, 2 circles, 2.5 circles, 3 circles etc..
Embodiment 6
The forming method of the present embodiment middle magnetic ring, including blank forming, sintering heat treatment, blank forming include magnetizing compacting and
Demagnetization after compacting, magnetizes and is compressed to magnetic powder in annular die cavity, alignment magnetic field be orientated the magnetic powder in annular die cavity,
While orientation magnetic powder be under pressure and compaction moulding and obtain be orientated base substrate, during orientation, alignment magnetic field is relative in annular die cavity
Magnetic powder rotates；The direction of erasing field is consistent with the direction of alignment magnetic field, and erasing field is that alignment magnetic field keeps its direction
Constant and reduce field intensity and obtain, erasing field be divergent magnetic field that field intensity is constant and less than the field intensity of alignment magnetic field (such as erasing field
0.95 times of the constant field intensity for alignment magnetic field of field intensity, 0.9 times, 0.8 times, 0.7 times, 0.6 times, 0.5 times, 0.4 times, 0.3
Times, 0.2 times, 0.1 times etc.), demagnetization is orientation base substrate demagnetization in erasing field, and during demagnetization, erasing field is relative to annular die cavity
In orientation base substrate rotate.Depending on the number of turns (angle) the rotated during orientation intensity with technological requirement and alignment magnetic field；
Depending on the number of turns (angle) the rotated during demagnetization intensity with technological requirement and erasing field.When orientation or during demagnetization, turn
The dynamic number of turns (angle) is 15 °, 20 °, 30 °, 45 °, 50 °, 60 °, 120 °, 160 °, 200 °, 250 °,
300 °, 360 °, 2 circles, 2.5 circles, 3 circles etc..
Distinguish with above-described embodiment, erasing field for being provided by a magnetic source (erasing field can also be by two magnetic sources or
Three magnetic sources of person or four magnetic sources or five magnetic source superposition offers jointly etc.).
Distinguishing with above-described embodiment, the maximum field strength of erasing field is that (maximum field strength of erasing field can also be 1T
0.95T、0.98T、0.97T、0.88T、0.86T、0.83T、0.80T、0.79T、0.78T、0.75T、0.73T、0.70T、
0.65T、0.6T、0.55T、0.5T、0.45T、0.4T、0.35T、0.3T、0.25T、0.2T、0.15T、0.1T、0.05T
And other arbitrary value less than 1T).
The present invention program, as a example by the technical scheme of embodiment 1, is contrasted by the present invention program with prior art means, and not
As the restriction of scope, in place of the excellence of the present invention program to be described, its detailed content is as shown in the table:
As seen from the above table, the present invention program compared with prior art, achieves in the production efficiency of product and is obviously improved, with
Shown in upper conclusion, not just for the explanation to embodiment 1 technical scheme, and it is equally applicable to the bag for technical solution of the present invention
Include and be not limited to the display of all possible technical scheme superiority cited by above-described embodiment.
This place embodiment is to right in place of the claimed non-limit of technical scope midrange and in embodiment technical scheme
Single or multiple technical characteristic replace the new technical scheme formed on an equal basis, the most all in the scope of protection of present invention
In；Simultaneously in all embodiments enumerated or do not enumerate of the present invention program, parameters in the same embodiment is merely representative of
One example (i.e. a kind of feasible scheme) of its technical scheme, and there is not strict cooperation between parameters and close with limiting
System, the most each parameter can mutually be replaced, except special declaration when stating ask without prejudice to axiom and the present invention.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned technological means, also include by more than
The technical scheme that technical characteristic combination in any is formed.The above is the detailed description of the invention of the present invention, it is noted that for
For those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to make some improvement and profit
Decorations, these improvements and modifications are also considered as protection scope of the present invention.
Claims (6)
1. the forming method of a magnet ring, it is characterised in that: including blank forming, sintering heat treatment, described blank forming includes magnetizing
Demagnetization after compacting and compacting, described in magnetize and be compressed to magnetic powder in annular die cavity, by alignment magnetic field to the magnetic in annular die cavity
Powder is orientated, while orientation magnetic powder be under pressure and compaction moulding and obtain be orientated base substrate, during orientation alignment magnetic field relative to
Magnetic powder in annular die cavity rotates；The direction of described erasing field is consistent with the direction of alignment magnetic field, the field intensity of erasing field
Constant and less than the field intensity of alignment magnetic field, described demagnetization is orientation base substrate demagnetization in erasing field, and during demagnetization, erasing field is relative
Orientation base substrate in annular die cavity rotates.
The forming method of magnet ring the most according to claim 1, it is characterised in that: described alignment magnetic field is in annular die cavity circumference range
In be stationary magnetic field or the magnetic field of regular change or irregular magnetic field.
The forming method of magnet ring the most according to claim 1, it is characterised in that: described erasing field is that alignment magnetic field keeps its side
To constant and reduce field intensity and obtain.
The forming method of magnet ring the most described, it is characterised in that: described erasing field be parallel magnetic field or
Divergent magnetic field.
The forming method of magnet ring the most described, it is characterised in that: described erasing field is for be carried by a magnetic source
Supply or jointly provided by two magnetic sources or two or more magnetic source superposition.
6. according to the forming method of the magnet ring described in claim 1 or 3 or 4 or 5, it is characterised in that: the maximum of described erasing field
Field intensity is less than or equal to 1T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009870.4A CN105845424A (en) | 2016-01-06 | 2016-01-06 | Forming method of magnetic ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009870.4A CN105845424A (en) | 2016-01-06 | 2016-01-06 | Forming method of magnetic ring |
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ID=56580337
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| CN201610009870.4A Pending CN105845424A (en) | 2016-01-06 | 2016-01-06 | Forming method of magnetic ring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396425A (en) * | 2018-12-13 | 2019-03-01 | 宁波韵升股份有限公司 | A kind of neodymium iron boron powder moulding mold for drift angle of magnetizing |
| 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 |
-
2016
- 2016-01-06 CN CN201610009870.4A patent/CN105845424A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396425A (en) * | 2018-12-13 | 2019-03-01 | 宁波韵升股份有限公司 | A kind of neodymium iron boron powder moulding mold for drift angle of magnetizing |
| 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 |
| CN111638477B (en) * | 2020-05-18 | 2022-09-27 | 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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Application publication date: 20160810 |