CN1434467A - Permanent magnet for suction - Google Patents
Permanent magnet for suction Download PDFInfo
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- CN1434467A CN1434467A CN 02126903 CN02126903A CN1434467A CN 1434467 A CN1434467 A CN 1434467A CN 02126903 CN02126903 CN 02126903 CN 02126903 A CN02126903 A CN 02126903A CN 1434467 A CN1434467 A CN 1434467A
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- suction
- permanent magnet
- magnet
- orientation
- magnetic
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- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The present invention provides an attractive permanent magnet for improving the attractive force by attracting and fixing a fixed object, such as paper or a sheet on an attracted object, such as an application iron plate or a notice board and hardly slipping off these fixed objects carelessly. The permanent magnet, consisting of an injection molding of a magnet composition comprising 35-75 vol.% of magnetic powder and the remainder part of a synthetic resin, consists of an anisotropic magnet re- magnetizing reverse magnetic field application in alignment simultaneous magnetization or in the same pattern as the alignment simultaneous magnetization so that the axis of easy magnetization of the magnetic powder, constituting the permanent magnet passes from an attractive interaction face to a magnet inside and returns to the attraction interaction face again.
Description
TECHNICAL FIELD OF THE INVENTION
The present invention relates to permanent magnet for suction, concrete related permanent magnet for suction is: the absorption affinity of utilizing this permanent magnet, fixed objects such as paper or thin slice are absorbed and fixed on the absorption objects such as japanning iron plate (blank), electronic blackboard, bulletin board, and these fixed objects also are difficult to come off accidentally the time, have improved absorption affinity.
Technology in the past
In the past, this permanent magnet for suction was to use the sintered magnet or the synthetic resin magnet of rare earth metal or ferrite series.As shown in figure 17, the direction of orientation of the magnetic of these magnet is axial (axial direction) anisotropic magnets, and therefore, the quality of absorption affinity depends on kind and the containing ratio that uses magnetic.
Improving on this aspect, special public clear 63-59243 communique motion the direction of easy magnetizing axis have the sintering anisotropy permanent magnet that boundling is orientated.The problem that invention solves
As shown in figure 18, the described permanent magnet of above-mentioned communique is the direction that makes easy magnetizing axis from non-suction-operated face (the whole faces beyond the suction-operated face) to suction-operated face boundling orientation (below be designated as simple boundling orientation), utilizes this magnet can make that the flux density of per unit area is bigger than in the past magnet.
But necessarily the absorption affinity than axial orientation magnet is big just enough to it is hard to tell above-mentioned simple boundling orientation magnet, also hopes and further improves absorption affinity.
And sintered magnet is when sintering, because the difference of the shrinkage of easy magnetizing axis and hard axis exists easily to cause problems such as warpage, crackle.In this case, can obtain goods even select sintering condition to prevent warpage or crackle, but resulting goods are because in the use of absorption, desorption, there is the frequent defective that crackle takes place in inner distortion.
As shown in figure 19, in order to prevent this crackle, to improve absorption affinity, the method of using has: the back yoke 10 of combination ferromagnetism body on sintered magnet 9, but the problem that exists is: the surface of magnet 9 is not easy to be positioned at on the one side with the end face of back yoke 10, that is: be not easy to constitute flush, when back yoke end face leans on the back than magnet surface, can reduce absorption affinity, and when back yoke end face is more outstanding than magnet surface, not only can reduce absorption affinity, and when absorption, damage the face that is adsorbed of bulletin board, electronic blackboard etc. easily.
In view of this actual conditions, the invention provides the permanent magnet for suction that further improves absorption affinity than above-mentioned simple boundling orientation magnet.Solve the means of problem
The result that the present inventor studies with keen determination in order to solve above-mentioned problem is: the magnet constituent that contains the specified quantitative magnetic is by injection molding permanent magnet, make it in specific direction orientation, and make average orientation more than particular value, find the scheme that accomplishes the end in view therefrom, finished the present invention.
That is: the solution of the present invention 1 relates to a kind of permanent magnet for suction, it is characterized in that: be the permanent magnet that injection molded article constituted of the magnet constituent formed of synthetic resin by magnetic, the remainder of 35～75vol%, constitute this permanent magnet magnetic easy magnetizing axis from suction-operated face by magnet inside, turn back to suction-operated face again and be orientated simultaneously magnetization like this, perhaps use with being orientated the counter field that magnetizes same way as (Pattern) simultaneously and apply magnetized anisotropic magnet again, average orientation is more than 80%.
The solution of the present invention 2 is as scheme 1 described permanent magnet for suction, it is characterized in that: synthetic resin is select from polyamide, acrylonitrile-butadiene-styrene (ABS) (ABS) resin, Corvic, polyphenylene sulfide (PPS) resin, liquid crystalline resin, synthetic rubber at least a.
The simple declaration of figure
Fig. 1 is the skeleton diagram that is expressed as magnetic field orientating injecting molding die one example of making permanent magnet for suction of the present invention.
Fig. 2 is the I-I profile of Fig. 1.
Fig. 3 is the II-II profile of Fig. 1.
Fig. 4 is the profile of shape one example of expression permanent magnet for suction of the present invention.
Fig. 5 is the profile of shape one example of expression permanent magnet for suction of the present invention.
Fig. 6 is expressed as the magnetic force loop of manufacturing permanent magnet for suction of the present invention and the skeleton diagram of state of orientation.
Fig. 7 is expressed as the magnetic force loop of manufacturing permanent magnet for suction of the present invention and the skeleton diagram of state of orientation.
Fig. 8 is expressed as the magnetic force loop of manufacturing permanent magnet for suction of the present invention and the skeleton diagram of state of orientation.
Fig. 9 is expressed as the magnetic force loop of manufacturing permanent magnet for suction of the present invention and the skeleton diagram of state of orientation.
Figure 10 is expressed as the magnetic force loop of manufacturing permanent magnet for suction of the present invention and the skeleton diagram of state of orientation.
Figure 11 is expressed as the magnetic force loop of manufacturing permanent magnet for suction of the present invention and the skeleton diagram (III-III section) of state of orientation.
Figure 12 is expressed as the magnetic force loop of manufacturing permanent magnet for suction of the present invention and the skeleton diagram of state of orientation.
Figure 13 is expressed as the magnetic force loop of manufacturing permanent magnet for suction of the present invention and the skeleton diagram (IV-IV section) of state of orientation.
Figure 14 is that expression uses permanent magnet for suction of the present invention paper to be adsorbed on the skeleton diagram of japanning iron plate state.
Figure 15 is that expression uses axial orientation magnet paper to be adsorbed on the skeleton diagram of japanning iron plate state.
Figure 16 is that expression uses the axial orientation magnet that the back yoke is installed paper to be adsorbed on the skeleton diagram of japanning iron plate state.
Figure 17 is a skeleton diagram of representing axial orientation permanent magnet in the past.
Figure 18 is a skeleton diagram of representing simple boundling orientation permanent magnet in the past.
Figure 19 is the skeleton diagram of the axial orientation permanent magnet of yoke after the installation of representing in the past.
The working of an invention form
The present inventor at first thinks: in order to improve the absorption affinity of permanent magnet, when making magnet absorption, be not to make that the waste magnetic line of force that radiates from non-suction-operated face is few more good more, but the easy magnetizing axis that makes magnetic from suction-operated towards magnet inside, and then the orientation of the suction-operated face of turning back to is best.Through the further result of research with keen determination, finding to make average orientation is more than certain value, and the permanent magnet that can obtain having abundant absorption affinity, thereby realized the present invention.
Absorption permanent magnet of the present invention is made of the magnetic of 35～75vol%, the magnet constituent that all the other are formed for synthetic resin.
Magnetic used in the present invention can use and contain the magnetic etc. that ferrite series magnetic, ferro-aluminum nickel cobalt (alloy) series magnetic and SmCo series magnetic or neodymium-iron-boron series magnetic, samarium-iron-nitrogen system row magnetic etc. contain the rare earth metal element, can use well-known in the past any, the diameter of its averaged particles, normally usedly be: ferrite series is about 0.5～2.0 μ m, and other series is about 2～50 μ m.
Synthetic resin as binding agent used in the present invention can use well-known in the past any.As its typical example, can use: polyamide 6, polyamide 12, polyamide 66, contain the polyamide series resin of the aromatic polyamide etc. of aromatic ring; The polyolefin series resin of single or copolymer such as Corvic, polyethylene vinyl acetate ester copolymer resin, plexiglass, polystyrene resin, polyethylene and polypropylene; The commodity of polyurethane resin, silicone resin, polycarbonate resin, polybutylene terephthalate (PBT) (PBT), PETG mylar such as (PET), polyether-ether-ketone (PEEK) resin, polyphenylene sulfide (PPS) resin, haloflex (CPE) resin, chlorosulfonated polyethylene resin E.I.Du Pont Company are called " high Bel ", acrylonitrile-butadiene-styrene (ABS) (ABS) resin, liquid crystalline resin, epoxy series plastics, phenolic aldehyde series plastics etc.; Rubber such as isoprene, chlorobutadiene, butylbenzene, butadiene, acrylonitrile butadiene; The synthetic rubber of alkene series ethylene-propylene-alkadienes-methylene (EPDM), urethanes series, polyester series etc. etc.Can use these single materials, or can use mixing more than 2 kinds as required.In these materials, preferably use polyamide, ABS resin, Corvic, PPS resin, liquid crystalline resin, synthetic rubber.
Magnetic with the ratio that cooperates as the synthetic resin of binding agent is: magnetic is that 35～75vol%, synthetic resin are the scope of 65～25vol%, and magnetic is the scope of 60～72vol% preferably.During magnetic deficiency 35vol%, there is not sufficient absorption affinity, in addition, when magnetic surpassed 75vol%, melt viscosity increased and is difficult to injection moulding, and promptly allows to injection moulding, also be easy to generate crackle,, be easy to generate the damage of breaking using absorption repeatedly with magnet, repeatedly during desorption.
In addition, in others, certainly use plasticizer in the past commonly used and antioxidant, surface conditioning agent etc. according to purposes.
Permanent magnet for suction of the present invention is to be made of anisotropic magnet, promptly, constitute this permanent magnet magnetic easy magnetizing axis from suction-operated face by magnet inside, turn back to suction-operated face again and be orientated simultaneously magnetization like this, perhaps use and be orientated the counter field that magnetizes same way as simultaneously and apply magnetization again.This anisotropic magnet for example, can use die for injection molding shown in Figure 1 to make.
Fig. 1 is the skeleton diagram of die for injection molding one example produced of a plurality of magnet of expression, the 1st, and die cavity, the 2nd, cast gate, the 3rd, runner, the 4th, permanent magnet, the 5th, yoke (permanent magnet), the 6th, nonmagnetic material, the 7th, outstanding pole.Fig. 2 is that I-I profile, the Fig. 3 among Fig. 1 is the II-II profile.
Be that the resin magnet constituent of main component is through cast gate 2, runner 3 and in the filling die cavity 1 with magnetic and synthetic resin, as shown by arrows, making the easy magnetizing axis of magnetic particle turn back to suction-operated face along the magnetic line of force from suction-operated face again by magnet inside is orientated like this.In addition, example shown in Figure 1 is to use permanent magnet 4, can certainly use electromagnet to replace permanent magnet.The permanent magnet for suction 8 that is taken out by die cavity 1 has suction-operated face K and non-suction-operated face H.
Permanent magnet for suction of the present invention is to be obtained by injection moulding, can not obtain the good adsorption permanent magnet with other forming method.
For example, situation about having can not compression forming with magnetic, for example, mean particle diameter is the little ferrite of 1～5 μ m or the magnetic of SmFeN series, particularly when making the situation of thin objects, when the blank moulding bridge joint phenomenon can take place, magnetic can not enter in the die cavity swimmingly, causes that so-called filling is bad.As a result, goods produce the space, cause mechanical strength not enough, and are when falling down accidentally in the use, damaged easily.
In addition, extrusion molding is to keep shape must set high viscosity extruding the back, and can not improve the degree of orientation because the application time of alignment magnetic field is short, and the result is difficult to obtain the high goods of absorption affinity.Therefore, must make extruded velocity extremely slow,, but can reduce production efficiency like this and increase cost significantly so that the magnetic field orientating time is long.
And on the other hand, the viscosity during injection moulding filling die cavity is low, can guarantee the magnetic field application time, promptly to cooling curing fully, can guarantee fully the orientation time, can obtain well-behaved permanent magnet for suction with low cost.Though reaction injection molding (RIM) must have special formation system,, it can be used as the forming method use because of having both injection molding strong point.
Permanent magnet for suction average orientation of the present invention must be adjusted into more than 80%.Average orientation less than 80% can not obtain the good permanent magnet of absorption affinity even improve the containing ratio of magnetic, preferably more than 90%.
In addition, in the present invention, average orientation is tried to achieve by following method.
Determined sample relative orientation direction is vertically severed, with the orientation conditions of its section each several part with take a picture obtained benchmark degree of orientation sample relatively with SEM in advance, determine each several part the degree of orientation, be averaged the degree of orientation.The manufacture method of benchmark degree of orientation sample is as follows, for example, its degree of orientation roughly is divided into the intensity of the alignment magnetic field when setting sample making at quarter of 5%.The following setting in the visual field that the SEM of determined sample takes a picture is divided into 10 parts till being orientated from suction-operated face to magnet inside, turning back to suction-operated face again, adopt its mean value.
The magnetic field orientating exciting method can use known permanent magnet mode and electromagnet mode.When using rare earths series magnetic, the electromagnet mode that can apply big magnetic field is favourable, and when ferritic situation, uses the mode of permanent magnet to possess the advantage that helps the mould miniaturization.
As the exciting permanent magnet of magnetic field orientating, known neodymium-iron-boron series sinter magnet, Sm-Co sintered magnet are suitable for.
Permanent magnet for suction of the present invention has the suction-operated face of the face that is adsorbed according to absorption objects such as japanning iron plate (blank), electronic blackboards.The face of being adsorbed is generally the plane, if but the face that is adsorbed is a curved surface, then make the suction-operated face of curved surface.Whole shape can be disc-shape, oval plate shape and other different shape.For example can enumerate: polygons such as triangle, pentagon shape, hexagonal configuration, anistree shape, have at central portion that the ring-type of through hole, hemispherical etc. part are spherical, cone shape, polygonal hammer shape etc., the shape that two above disks are connected etc. in addition.
Permanent magnet for suction of the present invention for example, as Fig. 4, shown in Figure 5, preferably is the non-suction-operated face H of the opposite side of suction-operated face K greatlyyer than suction-operated face K.Because make such shape, when using permanent magnet for suction, arrest with hand easily.Example shown in Figure 4 is the shape that the large diameter disc-shape portion of the disc-shape portion of the minor diameter of suction-operated face K side and non-suction-operated face H side is connected, and example shown in Figure 5 is the cone shape that dwindles from non-suction-operated face H side direction suction-operated face K side.
And permanent magnet of the present invention also can be in non-suction-operated face one side (not only comprise an opposite side of suction-operated face, also comprise the side) with identical magnet constituent mounting knob.Handle can use well-known shapes such as pot cover mode, the form of falling the carnival hat.In addition,, help economical with materials, also help cost the non-suction-operated face side of permanent magnet for suction not too the work magnet constituent of part of absorption is cut down and removed and the shape of handle is set.And, also can come after moulding handle, the moulding by being packed with or the bonding handle that forms with the synthetic resin beyond the magnet constituent.
Fig. 6～Figure 13 is the magnetic force loop of expression permanent magnet for suction of the present invention and several examples of state of orientation.And, in these figure, numeral be only to be the example of reference dimension (mm).
Effect
What Figure 14, Figure 15, Figure 16 represented respectively is: the axial orientation permanent magnet of use permanent magnet for suction of the present invention, axial orientation permanent magnet, the back yoke being installed is absorbed and fixed at paper 11 skeleton diagram of the state on the japanning iron plate 12.
By these figure as can be known, because permanent magnet for suction of the present invention is few from the magnetic line of force of radiation that non-suction-operated face is wasted, the magnetic line of force is used in the suction-operated effectively, so can think that the present invention is the permanent magnet for suction of the powerful absorption affinity of performance.
Embodiment
Below enumerate embodiment, comparative example the present invention is described in further detail, but these not any limitation of the invention.
Use the die for injection molding in setting magnetic force loop shown in Figure 1,, make the magnet of the disc-shape of diameter 30mm, thickness 5mm by injection moulding with following cooperation and condition of molding.Estimate the rerum natura of resulting permanent magnet for suction by following method and standard.Evaluation result is shown in the table 1.In addition, below boundling orientation of the present invention is designated as suction-operated face boundling orientation.Cooperate
Magnetic (ferromagnetic oxide powder: lead oxide magnetic ferrites class Sr serial ferrite)
Mean particle diameter (1.5 μ m) 68vol%
Synthetic resin (polyamide 12) 31vol%
Plasticizer (TTS: 1vol% condition of molding isopropyl triisostearoyltitanate)
Injection cylinder temperature: 280 ℃
Mold temperature: 100 ℃
Injection pressure: 1500kg/cm
2
The excitatory time: 20 seconds
Cooling time: 25 seconds
Infusion cycles: 40 seconds evaluation methods and standard
Absorption affinity: the absorption affinity (g/cm when using permanent magnet for suction that 1 A4 copy paper absorption is remained on japanning iron plate
2).
◎: extremely strong (1200g/cm
2More than)
Zero: strong (900～1200g/cm
2Below)
△: common (600～900g/cm
2Below)
*: weak (600g/cm
2Below)
Warpage after the moulding: with the naked eye estimate the warpage after the permanent magnet for suction moulding.
◎: do not approve warpage
*: the approval warpage
Space: the space of with the naked eye estimating permanent magnet for suction.
◎: do not approve the space
△: approval space
Crackle: the crackle of with the naked eye estimating permanent magnet for suction.
◎: confirm flawless
△: confirm to have a little crackle
*: confirm to have remarkable crackle
Crackle when using repeatedly: the crackle when with the naked eye estimating the using repeatedly of permanent magnet for suction.
◎: confirm flawless
△: confirm to have a little crackle
*: confirm to have remarkable crackle
Shatter test: the state of permanent magnet for suction when the 1m height is fallen the concrete floor face detects by an unaided eye.
◎: confirm the outward appearance no change
Zero: confirm to have a little fragment
△: confirm to have many slightly fragments
*: confirm to have significant fragment
Embodiment 2～8
As shown in table 1, change data and other and the embodiment 1 identical permanent magnet for suction of making are estimated its rerum natura.Evaluation result is shown in the table 1.
Table 1
Comparative example 1～7
| Embodiment | ||||||||
| ????1 | ????2 | ?????3 | ?????4 | ?????5 | ????6 | ?????7 | ?????8 | |
| Magnetic | The S ferrite | The S ferrite | The S ferrite | The S ferrite | The S ferrite | The S ferrite | The S ferrite | The S ferrite |
| Synthetic resin | ??PA12 | ???PA12 | ???PA12 | PA aromatic ring family row | ???PPS | ??CPE | ???PEEK | ???PA6 |
| Forming method | Injection | Injection | Injection | Injection | Injection | Injection | Injection | Injection |
| Magnetic containing ratio (vol%) | ??68 | ???45 | ???68 | ??62 | ???62 | ??62 | ???58 | ???68 |
| Average orientation (%) | ??90 | ???95 | ???80 | ??90 | ???90 | ??90 | ???90 | ???90 |
| Shape | Disk | Disk | Disk | Disk | Disk | Disk | Disk | Annulus |
| Absorption affinity | ??◎ | ???○ | ???○ | ??○ | ???○ | ??○ | ???○ | ???○ |
| Warpage after the moulding | ??◎ | ???◎ | ???◎ | ??◎ | ???◎ | ??◎ | ???◎ | ???◎ |
| The space | ??◎ | ???○ | ???◎ | ??◎ | ???◎ | ??◎ | ???◎ | ???◎ |
| Crackle | ??◎ | ???◎ | ???◎ | ??◎ | ???◎ | ??◎ | ???◎ | ???◎ |
| Crackle when using repeatedly as absorption stationery | ??◎ | ???◎ | ???◎ | ??◎ | ???◎ | ??◎ | ???◎ | ???◎ |
| Shatter test | ??◎ | ???◎ | ???◎ | ??◎ | ???◎ | ??◎ | ???◎ | ???◎ |
Comparative example 1～2nd is changed into axial orientation (comparative example 1), simple boundling orientation (comparative example 2) respectively with suction-operated face boundling orientation, and comparative example 3 is that average orientation 80% is changed into 70%, comparative example 4 be change injection moulding into compression forming and other identical with embodiment 1 and permanent magnet for suction, estimate the rerum natura of above example.In addition, comparative example 5～7th, the example of the sintered magnet that obtains with following cooperation and condition of molding, axial orientation and yoke (comparative example 5), axial orientation and have back yoke (comparative example 6), simple boundling to be orientated (comparative example 7) without male offspring.The evaluation result of rerum natura is shown in the table 2.
In addition, for relatively, with the also expression in the lump of result of the permanent magnet for suction of embodiment 1.Cooperate
Magnetic (ferromagnetic oxide powder: lead oxide magnetic ferrites class Sr serial ferrite)
Mean particle diameter (1.5 μ m) 50vol%
Water 50vol% condition of molding
Water discharge method: interior cavity method
Excitatory method: vertical pressing under magnetic field
Forming temperature: 25 ℃
Firing temperature: 1250 ℃ of evaluation methods and standard
The evaluation method and the standard of the rerum natura of not showing in the table 1 are as described below.
Absorption bed knife: use permanent magnet for suction that the A4 copy paper is absorbed and fixed at maximum numbers on the japanning iron plate.
Scratch during absorption: when permanent magnet for suction is adsorbed on japanning iron plate and goes up and make it laterally to slide, the scratch on the iron plate painted surface that detects by an unaided eye.
Table 2
| Embodiment | Comparative example | |||||||
| ????1 | ????1 | ????2 | ????3 | ????4 | ????5 | ????6 | ????7 | |
| The magnetic force loop | Suction-operated face boundling orientation | Axial orientation | Simple boundling orientation | Suction-operated face boundling orientation | Suction-operated face boundling orientation | Axial orientation | Axial orientation | Simple boundling orientation |
| Magnetic | The S ferrite | The S ferrite | The S ferrite | The S ferrite | The S ferrite | The S ferrite | The S ferrite | The S ferrite |
| Synthetic resin | ??PA12 | ??PA12 | ???PA12 | ??PA12 | ??PA12 | ??- | ??- | ??- |
| Forming method | Injection | Injection | Injection | Injection | Compression | Sintering | Sintering | Sintering |
| Magnetic contains rate (vol%) | ??68 | ??68 | ???68 | ??68 | ??90 | ??100 | ??100 | ??100 |
| Average orientation (%) | ??90 | ??90 | ???90 | ??70 | ??80 | ??95 | ??95 | ??95 |
| Absorption affinity | ??◎ | ??× | ???△ | ??△ | ??○ | ??△～○ | ??◎ | ??- |
| Absorption affinity bed knife (opening) | ??25 | ??15 | ???18 | ??18 | ??20 | ??20 | ??10 | ??- |
| Warpage after the moulding | ??◎ | ??◎ | ???◎ | ??◎ | ??◎ | ??◎ | ??◎ | ??× |
| The space | ??◎ | ??◎ | ???◎ | ??◎ | ??△ | ??◎ | ??◎ | ??- |
| Crackle | ??◎ | ??◎ | ???◎ | ??◎ | ??△ | ??◎ | ??◎ | ??× |
| Crackle when using repeatedly as absorption stationery | ????◎ | ????◎ | ????◎ | ????◎ | ????△ | ????○ | ????○ | ????× |
| Shatter test | ????◎ | ????◎ | ????◎ | ????◎ | ????○ | ????× | ????○ | ????× |
| Scratch during absorption | ????◎ | ????◎ | ????◎ | ????◎ | ????◎ | ????○ | ????× | ????△ |
| Iron back yoke | Do not have | Do not have | Do not have | Do not have | Do not have | Do not have | Have | Do not have |
From the result of table 1 and table 2 as can be known, the absorption affinity of the synthetic resin permanent magnet of the simple boundling orientation of the axial orientation of comparative example 1 and comparative example 2 is insufficient, and, shown in comparative example 3, even suction-operated face boundling orientation, when average orientation less than 80%, absorption affinity is still insufficient.And shown in comparative example 4, the permanent magnet that obtains with compression forming has following problem: be easy to generate space and crackle during manufacturing, and as adsorbing stationery in using repeatedly, easy crackle.
In addition, fragment is arranged in shatter test can confirm the sintered magnet of the axial orientation of comparative example 5, this shortcoming, shown in comparative example 6, though can improve by the back yoke is set, but when absorption, damage the absorbate surface easily.And shown in comparative example 7, the shortcoming of simple boundling orientation situation has: goods generation warpage and crackle, and also shatter test also has fragment.
The effect of invention
According to above explanation, according to the present invention, there are not in the mill space and crackle, and, can not produce fragmentation even in use fall yet, in addition, can not damage the absorbate surface, cheap absorption magnet can be provided.
Symbol description
1: die cavity
2: cast gate
3: runner
4: permanent magnet
5: yoke (ferromagnetism body)
6: nonmagnetic material
7: outstanding pole
8: permanent magnet for suction
9: sintered magnet
10: rear yoke
11: paper
12: japanning iron plate
K: suction-operated face
H: non-suction-operated face
Claims (2)
1. permanent magnet for suction, it is characterized in that: be the permanent magnet that injection molded article constituted of the magnet constituent formed of synthetic resin by magnetic, the remainder of 35～75vol%, constitute this permanent magnet magnetic easy magnetizing axis from suction-operated face by magnet inside, turn back to suction-operated face again and be orientated simultaneously magnetization like this, perhaps use with being orientated the counter field that magnetizes same way as simultaneously and apply magnetized anisotropic magnet again, average orientation is more than 80%.
2. permanent magnet for suction as claimed in claim 1 is characterized in that: synthetic resin is select from polyamide, acrylonitrile-butadiene-styrene (ABS) (ABS) resin, Corvic, polyphenylene sulfide (PPS) resin, liquid crystalline resin, synthetic rubber at least a.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002012652A JP2003217923A (en) | 2002-01-22 | 2002-01-22 | Attractive permanent magnet |
| JP12652/2002 | 2002-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1434467A true CN1434467A (en) | 2003-08-06 |
Family
ID=27649805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02126903 Pending CN1434467A (en) | 2002-01-22 | 2002-07-25 | Permanent magnet for suction |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2003217923A (en) |
| CN (1) | CN1434467A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063997A (en) * | 2010-10-19 | 2011-05-18 | 李泽 | Magnet for absorbing impurities with ferromagnetic materials in fluids |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6920812B2 (en) * | 2016-11-30 | 2021-08-18 | 橘コンサルタンツ株式会社 | Multiple magnetizing units Permanent magnets, their manufacturing methods, molds, and magnetic circuits |
-
2002
- 2002-01-22 JP JP2002012652A patent/JP2003217923A/en not_active Withdrawn
- 2002-07-25 CN CN 02126903 patent/CN1434467A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063997A (en) * | 2010-10-19 | 2011-05-18 | 李泽 | Magnet for absorbing impurities with ferromagnetic materials in fluids |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003217923A (en) | 2003-07-31 |
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