CN100513124C - Method for manufacturing magnet roller - Google Patents
Method for manufacturing magnet roller Download PDFInfo
- Publication number
- CN100513124C CN100513124C CNB028147472A CN02814747A CN100513124C CN 100513124 C CN100513124 C CN 100513124C CN B028147472 A CNB028147472 A CN B028147472A CN 02814747 A CN02814747 A CN 02814747A CN 100513124 C CN100513124 C CN 100513124C
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- Prior art keywords
- magnetic
- yoke
- roller
- patch
- magnetic force
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- 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
- H01F41/0273—Imparting anisotropy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1701—Component parts, details or accessories; Auxiliary operations using a particular environment during moulding, e.g. moisture-free or dust-free
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/20—Inserts
- B29K2105/203—Magnetic parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
- B29K2995/0008—Magnetic or paramagnetic
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Method for molding plastic magnet and magnetizing yoke used for it, and method for manufacturing magnet roller. For molding a plastic magnet by injecting a resin material mixed with a compounded magnetic powder into a molding cavity (3) wherein a magnetic field is produced by a magnetizing yoke (4), a strong magnetic field is produced in the molding cavity (3) by a narrow-width projection (5) of the magnetizing yoke (4), and a relatively weak magnetic field is produced by a recessed part (7) in a predetermined region on one side of this strong magnetic field region. Thus, a required circumferential magnetic force pattern for the plastic magnet is realized in a short time without needing many know-hows. Especially, when manufacturing a magnet roller by combining magnet pieces, the magnetic force produced at an axial end of the magnet roller is almost equal to that at the center part. Thus, a method for manufacturing a magnet roller which dispenses with the adjustment of a magnetic force by grinding a formed magnet roller.
Description
Technical field
The present invention relates to be roughly fan-shaped etc. the magnetic patch and the manufacture method of the forming method of other plastic magnets, the yoke that is used for this method and magnetic roller with the component parts of the magnetic roller of uses such as roller and section configuration as the development of for example duplicator, printer.
Background technology
In devices such as electro-photography apparatus such as duplicator, printer or electrostatic recording etc., keep the visual visualization way of electrostatic latent image on the body as the sub-image that makes light-sensitive roller etc., well-known developing method is: the magnetic roller that configuration is formed by resin magnet in revolving cylinder, utilize the magnetic force property of magnetic roller, making the toner that is carried on the cylinder surface fly to sub-image keeps on the body, utilize chattering, keep the surface that toner is provided to sub-image, electrostatic latent image is visual.
When making this magnetic roller, now the manufacture method of generally using is: earlier the resin material that is mixed with magnetic powder such as ferrite among the adhesive of thermoplastic resins such as nylon or polypropylene is injected in the magnetic field of die cavity of metal molding die, formation has after the bar-shaped magnetic patch of fan-shaped section, make these magnetic patch threaded shafts again and adjoin each other, be combined into cylindric along circumferencial direction.
Figure 12 represents the simple sectional drawing of the magnetic roller 90 that can make with this method, and magnetic patch 91,93 threaded shafts 95 that make the magnetic patch 92,94 with N utmost point and have the S utmost point also dispose along circumferencial direction with adjoining each other, thus formation magnetic roller 90.So the magnetic roller that forms has following two problem points:
First problem points is, when giving the circumferential magnetogram of magnetic roller, existing way is by making the section configuration optimization of each magnetic patch, realize this magnetogram, so needing cost manufactures experimently for a long time, simultaneously also need to use a lot of experimental technologies, just can obtain the net shape of best magnetic patch.In some cases,, also can't obtain being enough to gratifying required magnetic force performance even manufacture experimently repeatedly.
In the prior art, with the magnetic patch moulding time, as shown in the significant points skiagraph of the metal molding die among Figure 13 and the magnetic flux line like that, between patrix 81 and counterdie 82, divide section configuration and be roughly fan-shaped shaping mold cavity 83, and be formed on patrix 81 on and divide the corresponding position of for example substantial middle portion of the arcuation face 84 of shaping mold cavity 83, the narrow projection front end face that makes yoke 85 is fixed the situation among the patrix 81 of being configured near arcuation face 84 ground under, to having formed by yoke 85 in the shaping mold cavity 83 in magnetic field, injection is mixed with the resin material of Magnaglo, thus, can Magnaglo be concentrated orientation at the part place of the close yoke 85 of magnetic patch, thereby form magnetic pole at this position.
Yet, when constituting as shown in figure 12 magnetic roller 90 when the polylith magnet 91-94 that uses the said method moulding being carried out bonding, magnetic characteristic with respect to 90 requirements of magnetic roller, the situation that the N utmost point for example offsets to one side from the circumferential central portion of the outer peripheral face of magnetic patch 92 appears, at this time yoke 85 is disposed with offseting to one side from the central portion of arcuation face 84 by skew with the circumferencial direction of the N utmost point, can correctly form the position of magnetic pole of the N utmost point, Zhou Fangxiang magnetogram in this case can be owing to causing occurring the shoulder Sh shown in Figure 14 between the magnetic pole at interval greatly, so need revise or change its all direction magnetogram, make it become the level and smooth curve shown in Figure 15.
In addition, more than explanation all is relevant explanations that form the problem points that takes place under the situation of magnetic patch 91-94 by injection moulding.Yet, in the extrusion molding of carrying out magnetic patch 91-94, also have same problem.
Promptly, when carrying out extrusion molding, at the extrusion molding mould peristome place that has formed magnetic field by yoke, after the resin material that has mixed Magnaglo extruded, it is cut off with set length, thereby formation magnet, the sectional drawing of this extrusion molding mould and extrusion molding mould peristome is similar with the sectional drawing shown in Figure 13, with the corresponding position, for example substantial middle position of the arcuation face of dividing the extrusion molding mould peristome, the narrow projection front end face that makes yoke is near this arcuation face, be configured on the extrusion molding mould thereby be fixed, at this moment, make the resin material that is mixed with Magnaglo by in the extrusion molding mould peristome that has formed magnetic field by yoke, magnetic patch is carried out extrusion molding, can make Magnaglo concentrate orientation whereby at the part place of the close yoke of magnetic patch, thereby form magnetic pole at this place, but, because the configuration of described yoke and shape, the same when forming magnetic patch by injection moulding, yoke can cause having shoulder Sh on the described circumferencial direction magnetogram, so there is the problem that must revise this magnetogram.
Therefore, the advanced development of left magnetic roller, when producing such circumferencial direction magnetogram, adopt the side that forms fan-shaped magnetic patch 92 is cut, with means such as change fan shape, the circumferencial direction magnetogram is confirmed on the limit, and the limit limits especially to the net shape of magnetic patch 92, and makes metal molding die or extrusion molding mould with this net shape.Other magnetic patch also is same, after existing manufacture method will be passed through the process of such complexity, can limit the net shape of magnet 91-94 especially, and the result who does like this has above-mentioned first problem.
Second problem points is, the magnetic force skewness of the roll axial direction of the latter made magnetic roller 90 of combination magnetic patch 91-94, for being distributed, this magnetic force reaches even distribution, must carry out the magnetic force of magnetic roller 90 is measured operations such as operation or cutting operation, will spend number and equipment investment in unnecessary man-hour for this reason.
Promptly, there is following problem in the prior art, the axial middle body of the magnetic roller 90 that behind simple combination magnetic patch 91-94, obtains, the magnetogram of the magnetic roller circumferencial direction that can obtain to expect, but, in axial two ends, magnetic force is higher than the magnetic force of axial middle body, produce so-called " shoulder shape riser portions ", therefore, when using on equipment such as duplicator, can't bring into play the performance of its expection at axial place, end to such magnetic roller, the image of the part of coaxial end correspondence with compare with the corresponding image of middle body, color is darker or more shallow.
Figure 16 is the curve map that illustrates the axial magnetic distribution of the N utmost point on the magnetic patch 92 that is positioned at magnetic roller 90.Transverse axis is represented the position that it is axial, and the longitudinal axis is illustrated in the magnetic force on each axial location, and Pc represents the axial central point of this magnetic roller 90, and P1 and P2 represent to make the axial both ends of live part of the magnetic force performance function of this magnetic roller respectively.Between P1 and the P2 and be near near these points the end position, its magnetic force is greater than the magnetic force of central part, produces so-called " takeing on the shape riser portions ".And, the magnetic roller 90 that has produced this " shoulder shape riser portions " is carried when using on devices such as duplicator, may cause with the end of the corresponding image of part of should " takeing on the shape riser portions " of magnetic roller 90 that image is bad.
In order to address this is that, existing way is, after 90 formation of magnetic roller are cylindric, must be according to the order that pre-establishes, perhaps according to the measurement result of magnetic force, both certain portions of the axial end portion of magnetic roller 90 are carried out grinding cutting processing, carry out the magnetic force adjustment whereby.Second above-mentioned problem points that Here it is.
Problem of the present invention is to solve these problem points that exist in the prior art.Its objective is: at first problem points, the yoke of using in a kind of forming method of plastic magnet and this forming method is provided, this method is under constant situation such as the shape that keeps plastic magnets such as magnetic patch, the shape by particularly changing yoke or the method for its structure realize required circumferential magnetogram, compare with prior art, need not many experimental technologies, can carry out the correction or the change of circumferential magnetogram at short notice, and, make the common injection moulding of plastic magnet become possibility;
In addition, at second problem points, a kind of manufacture method of magnetic roller is provided, this method can make the magnetic force of the coaxial central portion of magnetic force of the axial end portion of the magnetic roller that magnetic patch is combined to form at circumferencial direction form basic identically, and, needn't after forming columned magnetic roller, carry out adjustment magnetic force such as grinding cutting to it.
Summary of the invention
The present invention carries out for achieving the above object, and its main contents constitute and act on as follows.
(1)
The forming method of plastic magnet of the present invention is: be mixed with the resin material of Magnaglo in injection in the shaping mold cavity that has been formed magnetic field by yoke, or when the extrusion molding mould peristome that has been formed magnetic field by yoke is extruded the resin material that is mixed with Magnaglo and is made the plastic magnet moulding
With the yoke of the most close shaping mold cavity or extrusion molding mould peristome part in described shaping mold cavity or the extrusion molding mould peristome form high-intensity magnetic field, simultaneously, with the set zone of at least one side of forming this high magnetic field area in shaping mold cavity or the extrusion molding mould peristome form more weak magnetic field relatively.
This forming method is invented at above-mentioned first problem points, it can be injected into the molten resin material that is mixed with Magnaglo in the shaping mold cavity, perhaps at the extrusion molding mould peristome place that has formed magnetic field by yoke, utilize the high-intensity magnetic field part in magnetic field that Magnaglo is concentrated orientation on the plastic magnet of the resin material that is mixed with Magnaglo being extruded and forming, thereby locate the formation magnetic pole at this.
And, utilize this forming method, can produce significant action effect as described below.Promptly, when only forming magnetic patch in shaping mold cavity or under the high-intensity magnetic field in the extrusion molding mould peristome, on circumferential magnetogram, can produce shoulder Sh as shown in Figure 14, according to the inventive method, set zone at least one side that forms high magnetic field area, for example with the corresponding zone of above-mentioned shoulder Sh, form more weak magnetic field relatively in shaping mold cavity or in the extrusion molding mould peristome, part in this low-intensity magnetic field, make Magnaglo carry out to a certain extent orientation, by this kind method, can in fact remove the shoulder Sh shown in Figure 14 of circumferential magnetogram, thereby become the level and smooth circumferential magnetogram of representing among Figure 15.
Therefore, according to this forming method, the special qualification that need not to carry out to bring to its net shape because of the shape that changes plastic magnet etc., based on the metal molding die of this net shape or the making of extrusion molding mould etc., can within the short time, realize the circumferential magnetogram of expection simply.
(2)
The yoke preferred of the present invention that is used to implement said method is made of magnetic material, and it is configured in shaping mold cavity or extrusion molding mould peristome place near plastic magnet, in shaping mold cavity or extrusion molding mould peristome, form magnetic field, it also is provided with the yielding part, this yielding part is arranged in the horizontal section of yoke at least one side in the narrow projection of the most close shaping mold cavity or extrusion molding mould peristome, and should yielding partly have along with the tendency of leaving shaping mold cavity away from narrow projection gradually.
Herein, why use " tendency ", be meant that in related fields be also contained in the foregoing invention and make a concession part away from narrow projection midway, part is near the situation of shaping mold cavity with the shape of shaping mold cavity or extrusion molding mould peristome and the shape of yielding part etc.
Because such yoke can form high-intensity magnetic field with narrow projection in shaping mold cavity or in the extrusion molding mould peristome, and can form more weak magnetic field relatively to make a concession part, therefore, by implementing said method, can obtain aforesaid action effect.
In this yoke, in desired magnetic characteristic with not being provided with aspect related between original magnetic characteristic of making a concession part, as shown in figure 15, the yielding part that the narrow projection place is provided with can be brought into play such function, promptly remove shoulder Sh shown in Figure 14, and improve the magnetic force of the original part that shoulder does not take place artificially.These are provided with and can only carry out in a side of narrow projection, also can carry out in its both sides.
(3)
The yielding part of the yoke among the present invention can be made the yielding part of inclined plane type, also can make one or more stair-stepping yielding part.
According to this yoke, when this yielding part is made inclined plane type, can make the magnetic field that in shaping mold cavity or extrusion molding mould peristome, forms along with weakening gradually away from narrow projection, in addition, make stair-stepping the time when this yielding part, magnetic field can be along with weakening by stages away from narrow projection.
(4)
The manufacture method of magnetic roller of the present invention is that a manufacture method of magnetic roller is arranged, wherein, described have a magnetic roller to be: make a plurality of bar-shaped magnetic patch circumferentially adjoining each other along the periphery of axle, form cylindric, and a plurality of magnetic poles that extend are vertically arranged on the periphery of cylinder, this bar-shaped magnetic patch is made by the resin material that magnetic material is blended in the resin binder, it is characterized in that:
At least one magnetic patch in the above-mentioned magnetic patch is being magnetized into the part place on its circumferencial direction at least, the magnetic force at the both ends that it is axial is lower than the magnetic force of axial central portion, afterwards, this magnetic patch is made up with remaining magnetic patch, thereby forms the magnetic roller.
The manufacture method of magnetic roller of the present invention is the invention at above-mentioned second problem points.In order to investigate in existing magnetic roller magnetic force produces shoulder shape riser portions in the end reason, the inventor distributes distribute magnetic force with the part that is combined into this magnetic patch behind the magnetic roller of the axial magnetic of magnetic patch monomer to compare.The result shows, occurred end shoulder shape riser portions during the axial magnetic of magnetic patch monomer distributes, and in the magnetic roller that forms behind the combination magnetic patch, the magnetic force of the end that this is local has produced more obvious shoulder shape riser portions.
The manufacture method of magnetic roller of the present invention is invented with regard to being based on the knowledge and the opinion that newly obtain.According to this manufacture method, when forming magnetic patch, make axial end portion magnetic force lower than the magnetic force of axial middle body, the magnetic force recruitment of the end shoulder shape riser portions that the part of its reduction takes place when being the combination magnetic patch, so behind the combination magnetic patch, can make the magnetic force of axial end portion of magnetic roller just in time the magnetic force with middle body is equal substantially because of the shoulder shape rising phenomenon that produces in this combination, axially has the magnetic roller that even magnetic force distributes thereby can be formed on.Thus, needn't after forming the magnetic roller, carry out operations such as grinding cutting, can be simply and make the magnetic roller at an easy rate.
(5)
The manufacture method of magnetic roller of the present invention is the manufacture method of the magnetic roller on the basis of the invention described in (4), wherein, among the magnetic pole of above-mentioned a plurality of utmost points of described magnetic roller, have at least a pair of adjacent and have a repeller of identical polar, and on the periphery between these repellers, being provided with magnetic force almost is zero Gauss's band zero, that the distribution of the magnetic force on Zhou Fangxiang is smooth, and the manufacture method of this magnetic roller is characterised in that:
Described magnetic patch is made for the magnetic force that magnetic force that the part that it is included this zero Gauss's band and be adjacent to the repeller of these both sides is magnetized into both ends in the axial direction is lower than axial central portion.
Using in the magnetic roller on the duplicator etc., in order to improve the rate of recovery of toner, adopt such magnetic roller: among a plurality of magnetic poles that are provided with on the circumference of left magnetic roller, at least dispose one group of adjacent repeller, and on the periphery between these magnetic poles that repel mutually, having magnetic force roughly is zero, the circumferential smooth zero Gauss's band of magnetic force distribution.Because in general, the intensity of magnetization of this zero Gauss's band itself is little, so when the influencing of the repeller that is subjected to being positioned at its circumferential both sides, its magnetic force distributes and becomes unstable easily, the magnetic force of its axial end portion particularly, be subjected to the influence of the discontinuity of end magnetic force distribution, unstability more becomes.Than common magnetic pole, there is the more difficult problem of shoulder shape rising phenomenon of control end magnetic force in this magnetic roller.
In the manufacture method of this magnetic roller, include zero Gauss's band owing to make, and be adjacent to and repel between electrode and the magnetic force at the axial both ends of the magnetic patch of combination is lower than the magnetic force ground of axial central portion and magnetizes, so after on this magnetic patch combination left magnetic roller, utilize the shoulder shape effect of increasing of end magnetic force, can make axial magnetic force reach even distribution, thereby can obtain good especially effect.
(6)
The manufacture method of magnetic roller of the present invention is the manufacture method of the magnetic roller on the basis of the invention described in (5), it is characterized in that:
The magnetic patch that has above-mentioned zero Gauss's band is formed corresponding to the outer peripheral face of axle and section to form curved shape and has magnetic pole with the opposite polarity polarity of above-mentioned repeller in axially extended inner peripheral surface one side, make the side of the both sides of itself and inner peripheral surface adjacency form the magnetic pole that has with the repeller identical polar respectively, thereafter, this magnetic patch is carried out demagnetization
Then, in inner peripheral surface side position in opposite directions yoke is set with magnetic patch, so that this yoke is magnetized into inner peripheral surface with the opposite magnetic of repeller magnetic, with two above-mentioned side positions in opposite directions yoke is being set, so that this yoke is magnetized into these two sides with the identical magnetic of repeller polarity, and yoke is set in axial two end portions position in opposite directions with the outer peripheral face side, so that this yoke applies with the zero opposite polarity magnetic force of Gauss's band this two end portions, thereby the magnetic force that this magnetic patch is magnetized into its axial both ends is lower than the magnetic force of axial central portion.
The manufacture method of this magnetic roller, as mentioned above, be particularly related to zero Gauss's band that it is difficult to form magnetic force, inner peripheral surface side at axle, formation is with the opposite polarity magnetic pole of above-mentioned repeller, side in both sides, form the magnetic pole that has identical polar with above-mentioned repeller respectively, afterwards, make this magnetic patch demagnetization,, yoke is being set inner peripheral surface being magnetized into the opposite polarity of repeller with the inner peripheral surface side position in opposite directions of magnetic patch thereafter, two with above-mentioned side position in opposite directions, yoke is set these sides are magnetized into the identical polarity of repeller, so can suppress from the magnetic line of force quantity of this magnetic patch outer peripheral face, thereby make the magnetic field intensity of zero Gauss's band become zero substantially by in this magnet, forming from its two sides to the magnet that inner peripheral surface significantly is orientated to the outside.
And then, in the manufacture method of this magnetic roller, after with the demagnetization of magnetic roller, except inner peripheral surface and two the above-mentioned yokes that the side is located that are configured in this magnetic patch, in the magnetic patch outer peripheral face office, both ends with axial two end portions position in opposite directions side yoke is set also, to apply magnetic force with zero Gauss's band opposite polarity, thus, because magnetic patch is magnetized, and the magnetic force that makes the axial both ends of this magnetic patch is lower than the magnetic force of axial central portion, so as mentioned above, be combined to this magnetic patch on the columned magnetic roller after, can form the magnetic roller that the axial magnetic force of zero Gauss's band is evenly distributed.
(7)
The manufacture method of magnetic roller of the present invention is the manufacture method of the magnetic roller on the basis of the invention described in (6), it is characterized by:
The above-mentioned yoke that is configured in the axial two end portions position in opposite directions of magnetic patch outer peripheral face side is disposed obliquely, make it along with away from axial central portion and near the side face of magnetic patch.
Manufacture method according to this magnetic roller, because the above-mentioned yoke that will be configured in the axial two end portions position in opposite directions of magnetic patch outer peripheral face side disposes obliquely, so can form magnetic force on zero Gauss's band of magnetic patch distributes to the magnetic force that the end descends smoothly from axial central portion, the effect that the shape effect of increasing is cancelled out each other is takeed in the end of having played just in time and having occurred when being combined to this magnetic patch on the magnetic roller because this magnetic force distributes, so under with the state after the magnetic patch combination, can form and have the magnetic roller of zero Gauss's band uniformly that distributes all from axial middle body to end magnetic force.
Description of drawings
Fig. 1 is the skiagraph of expression yoke application examples.
Fig. 2 illustrates the skiagraph that is used for injection molding metal molding die device significant points.
Fig. 3 is the yoke skiagraph of the alternate manner of expression yoke.
Fig. 4 is the figure that the variation of part is made a concession in expression.
Fig. 5 is the simple sectional drawing of expression magnetic roller.
Fig. 6 is the magnetogram (curve) of magnetic roller.
Fig. 7 is the curve map that the magnetic force of zero Gauss's band of expression magnetic patch distributes.
Fig. 8 is the curve map that the magnetic force of zero Gauss's band of expression magnetic patch distributes.
Fig. 9 is the sectional drawing of the magnetized orientation of expression magnetic patch.
Figure 10 is the side view of the configuration of expression yoke.
Figure 11 is the XI-XI sectional drawing of Figure 10.
Figure 12 is to use the sectional drawing of the magnetic roller of existing method manufacturing.
Figure 13 is to use the skiagraph of the metal molding die of existing yoke.
Figure 14 is the figure that illustrates the circumferencial direction magnetogram of existing magnetic roller.
Figure 15 is the figure that illustrates revised circumferencial direction magnetogram.
Figure 16 is the curve map that expression uses the magnetic force of the N utmost point of the magnetic roller that existing method makes to distribute.
Figure 17 represents that use has method now and carried out the curve map that the magnetic force of zero Gauss's band of magnetized magnetic patch distributes.
The specific embodiment
Below, the accompanying drawings embodiments of the invention.
At first, to the working of an invention mode at first problem points, promptly first embodiment describes.Fig. 1 is the skiagraph of the metal molding die of expression yoke application examples of the present invention, and 1,2 represent upper and lower mould respectively among the figure, and the section configuration that 3 expressions are formed between the upper and lower mould is fan-shaped shaping mold cavity substantially.
At this, yoke 4 fixed configurations in patrix 1, the front end face of the narrow projection 5 of this yoke 4 is located near described arc surface 6 in the corresponding position of central part with the patrix arc surface 6 of dividing shaping mold cavity 3, simultaneously, the yielding part 7 of inclined plane type is set on yoke 4, this makes a concession a side (being the left side in the drawings) of the described narrow projection 5 of part 7 in the horizontal section of yoke 4, and it is along with leave shaping mold cavity 3 gradually away from narrow projection 5.
In this metal molding die, by nonmagnetic substance 8 around such yoke 4, thereby by magnetic material 9 its upper surfaces of supporting it is installed among the patrix 1 simultaneously, in addition, on magnetic material 11, form the recess 10 of the counterdie 2 of dividing shaping mold cavity 3.
Shown in the part sectional drawing among Fig. 2, aforesaid metal molding die 12, tetrad is made metal molding die device 13 and is used for injection moulding.In this case, by the magnetizing coil 14 on every side that is arranged on device 13 is switched on, the yoke 4 of each metal molding die 12 forms magnetic field in shaping mold cavity 3, in addition, never behind the cast gate of the molten resin material that contains Magnaglo that penetrates in the illustrated injection nozzle outside down gate 15 process runners 16 and figure, pressurized being filled in the shaping mold cavity 3.
Be filled into the resin material in the shaping mold cavity 3 like this, shown in the magnetic flux line that Fig. 1 dotted line is represented, in the influence that is subjected to high-intensity magnetic field with the narrow projection 5 corresponding zones of the big yoke 4 of magnetic flux line density, thus, concentrated orientation at this zone Magnaglo, this zone is endowed magnetic pole.On the other hand, with making a concession in the part 7 corresponding regional 17,, carry out the orientation to a certain extent of Magnaglo because resin material is subjected to the influence in more weak relatively magnetic field.
Thus, when use does not have the existing yoke 85 of making a concession part 7, become the Zhou Fangxiang magnetogram that has shoulder Sh as shown in figure 14; In being provided with the yoke of the present invention 4 of making a concession part 7, can be easy to realize Zhou Fangxiang magnetogram as shown in figure 15.
In addition in this occasion, also can be on the right side of narrow projection 5, replace as shown in fig. 1 yielding part 7 or on the basis that keeps this part, the same occasion yielding part the same shape or that changed shape is set in addition, thus, can increase the magnetic force of an opposite side of the peak of above-mentioned circumferential magnetogram.
Fig. 3 is the sectional drawing of the alternate manner of expression yoke, the yoke deflection is formed magnetic pole by a side of the magnetic patch of moulding (being the deflection right side in the drawings), simultaneously in order to prevent that shoulder from appearring in the Zhou Fangxiang magnetogram near magnetic pole, in the left side of narrow projection 5, the yielding part 7 of the inclined plane type of more widening than last example is set.
This situation also is under the effect of making a concession part 7, forms low-intensity magnetic field in the zone 17 of making a concession part 7 correspondences, is orientated by the Magnaglo to this place, can reach its intended purposes.
Fig. 4 is the figure of the yielding variation partly of expression yoke.Yielding part 7 among Fig. 4 a forms direct with the continuous inclined plane shape of the front end face of narrow projection 5, is equivalent to omit from Fig. 1 and Fig. 3 the step descending branch on the direction of leaving shaping mold cavity 3.
In addition, in Fig. 4 b, make yielding part 7 planar for one section the level that the front end face step from narrow projection 5 descends.
As shown in the above description, can be based on the shape of making a concession part 7, select as requested by the intensity of making a concession the magnetic field that part 7 forms.
Therefore, under the situation that Fig. 4 a represents, can suitably change the angle of inclination of making a concession part 7; Under the situation that Fig. 4 b represents, also can be suitably change over stepped more than two sections making a concession part 7.
Next, based on the working of an invention mode of Fig. 5-Figure 11 explanation at second problem points, i.e. second embodiment.Fig. 5 is the simple sectional drawing of the section of expression magnetic roller 21 of the present invention.Around axle 22, six bar-shaped magnetic patch 31-36 that combination along the circumferential direction adjoins each other form magnetic roller 21, and these magnetic patch 31-36 has the N1-N3 utmost point in order respectively, the S1 utmost point, the magnetic pole of the S2 utmost point and zero Gauss's band N0.The magnetic pole of the N1-N3 utmost point herein is the magnetic pole with N polarity, and the magnetic pole of the S1-S2 utmost point is the magnetic pole with S polarity, and N2 wherein is the magnetic pole of a pair of mutual repulsion with N3.
Fig. 6 is the curve map that the magnetogram of the circumferencial direction that obtains behind the magnetic force on the side face of this magnetic roller 21 has been measured in expression.The transverse axis use angle is represented circumferential locations, and the longitudinal axis is represented the size of magnetic force.A pair of repeller N2 on the left magnetic roller 21 is with being provided with zero Gauss's band between the N3, the polarity of the magnetic force of this zero Gauss's band is N, and its magnetic force is distributed as: magnetic force flatly expands out at circumferencial direction being roughly under zero the state.
Fig. 7 is the curve map that is illustrated in the axial magnetic distribution that is combined to the zero Gauss's band N0 on magnetic roller 21 magnetic patch 36 in the past, and transverse axis is represented axial position, and the longitudinal axis is represented the size of magnetic force.Scope between the P1-P2 is the effective range of the magnetic force after being installed in this magnetic roller 21 on the device, in the manufacture method of this magnetic roller, when magnetization magnetic patch 36, the magnetic force that makes near the axial location the end on P1 and P2 next door is less than the axially magnetic force ground formation of central portion, and past more end magnetic force ninor feature more becomes.
Fig. 8 is that expression is made up the magnetic patch 31-35 of magnetic patch 36 with other together, the curve map that the axial magnetic of zero Gauss's band N0 behind the formation magnetic roller 21 distributes, it is illustrated in the magnetic roller after the magnet 31-36 combination, can control the magnetic force that makes zero Gauss's band N0 and evenly distribute in the axial direction, and to make magnetic force be zero substantially.
Thus, in order to give magnetic roller 21 with magnetic force distribution uniformly in the axial direction, importantly make the magnetic force of the end magnetic force at the zero Gauss's band place that is combined into magnetic roller 21 magnetic patch 36 before less than central portion, this point can be realized with following illustrational method.
At first, be injected in the shaping mold cavity of the metal molding die that is applied with magnetic field, perhaps this material extruded in the extruder head that is applied with magnetic field, thereby made magnetic patch 36 moulding having mixed the resin material behind the Magnaglo.Fig. 9 is the sectional drawing of orientation of Magnaglo of section part that is illustrated in the magnetic patch 36 of this stage moulding, metal molding die or extruder head are applied that moulding is carried out in magnetic field so that the orientation of Magnaglo becomes these magnetic patch 36 inner peripheral surfaces 41 sides is the S utmost point, two sides 42 sides are the N utmost point.Next, this magnetic patch 36 is applied AC magnetic field, once it was carried out demagnetization, afterwards, around this magnetic patch 36, yoke is set, this magnetic patch 36 is magnetized.
Figure 10 is the side view of the configuration of expression yoke, and Figure 11 represents the sectional drawing of XI-XI section among Figure 10.Configuration polarity is that the yoke 51 of the N utmost point makes it in opposite directions in the inner peripheral surface 41 of magnetic patch 36, and then, configuration polarity is that the yoke 52 of the S utmost point makes it in opposite directions in the two sides 42 of magnetic patch 36, and the result is magnetized into the S utmost point to inner peripheral surface 41, and two sides 42 are magnetized into the N utmost point.
Meanwhile, by two ends of 43 on the outer circumference surface of magnetic patch 36, configuration polarity is the yoke 53 of the N utmost point, reduce original just only a little to the N utmost point one side-draw to the magnetic force of end of zero Gauss's band N0.And then, tilt to set yoke 53, make its along with from the axial central portion of magnetic patch 36 towards end direction gradually near the outer peripheral face 43 of magnetic patch 36, therefore, between the outer peripheral face 43 of magnetic patch 36 was with yoke 53, being provided with section was the non magnetic liner 54 of triangle.
By carrying out the configuration of aforesaid yoke 51-53, make magnetic patch 36 magnetization, can form the magnetic patch 36 that axial end portion magnetic force is lower than zero Gauss's band N0 that the magnetic force of central portion magnetic force distributes that has as shown in Figure 3.
If do not use yoke 53, then this magnetic patch 36 becomes the axial magnetic shown in Figure 17 that end magnetic force produces shoulder shape riser portions and distributes, if on such magnetic patch 36 combination left magnetic rollers, then the magnetic force in axial end can produce and take on the shape riser portions greatly, can't use in practice, at this, the effect of yoke 53 is to improve the magnetic patch and the magnetic roller that can't use in this reality.
In addition, in above-mentioned manufacture method, after once magnetic patch 36 demagnetizations of moulding in magnetic field, carried out magnetization once more, still,,, also can obtain effect same according to the magnetization condition even not demagnetization is just magnetized once more.In addition, though in this embodiment, the magnetic patch 36 that zero Gauss's band is arranged is illustrated, its effect size shoulds be regarded as a different matter, but by under the state before being combined into the magnetic roller at magnetic patch 31-35 it being carried out same processing at other, make the magnetic force of axial end portion be reduced to the degree that is lower than central portion magnetic force, can make the axial magnetic force that is combined into behind the magnetic roller distribute more even.
(embodiment)
The resin material that has mixed Magnaglo is injected in the metal molding die that is applied with magnetic field, make after magnetic patch 36 moulding its demagnetization, then as Figure 10, shown in Figure 11, configuration yoke 51-53, make magnetic patch 36 magnetization again, and assemble this magnetic patch 36, create the magnetic roller 21 of form of fracture as shown in Figure 5, with this magnetic roller 21 as embodiment, the axial magnetic of measuring zero Gauss's band N0 of magnetic roller 21 among this embodiment distributes, and its magnetic force distribution of magnetic patch 36 being magnetized the existing magnetic roller of formation with not disposing the yoke 53 in the yoke shown in Figure 10 is contrasted.Magnetic roller manufacture method in the conventional example is compared with the manufacture method of magnetic roller among the embodiment, and except that not disposing yoke 53, both are identical.
In addition, for this relatively the external diameter of the magnetic roller of usefulness be 14.5mm.In addition, the external diameter that is configured in the cylinder that the periphery of this magnetic roller uses is 16mm, therefore, and when measuring the magnetic field intensity of this magnetic roller, the position of the front-end configuration of mensuration probe at distance magnetic roll shaft heart 8mm.
In the table 1 respectively with the maximum of end magnetic force and the magnetic force deviation after from the maximum magnetic force in the effective range of axial magnetic, deducting minimum magnetic force represent the axial magnetic Determination of distribution result of embodiment with zero Gauss's band of the magnetic roller of conventional example.When this magnetic roller being installed on the device printing image, the maximum and the magnetic force deviation of the end magnetic force of the magnetic roller of no problem are respectively 4mT and 3mT, and the distribution of the magnetic force of zero Gauss's band of not allowed in the table 1 expression magnetic roller with conventional example is improved as the situation of the level that quilt is allowed in according to the magnetic roller of the manufacture method manufacturing of embodiment.
Table 1
| Assessment item | Conventional example | Embodiment |
| End magnetic force maximum | 6.5mT | 2.0mT |
| The magnetic force deviation | 6.0mT | 1.5mT |
From the above description obviously as seen, according to invention at first problem points, particularly form high-intensity magnetic field in the shaping mold cavity near the part of shaping mold cavity with yoke, while is by the set zone of at least one side that forms this high magnetic field area, form the relative more weak magnetic field in the shaping mold cavity, consequently, magnetogram is unlike prior art, the present invention need not many experimental technologies, in addition can the short time with interior required correction or the change of magnetogram that realizes the Zhou Fangxiang of plastic magnet simply, and can make the common injection moulding of plastic magnet become possibility.
In addition, according to invention at second problem points, because after the magnetic patch magnetization, this magnetic patch is made up with remaining magnetic patch, make the magnetic roller and make the part on its circumferencial direction at least, axial both ends magnetic field intensity is lower than the magnetic field intensity of axle center, can make axial magnetic field intensity magnetic roller so the magnetic roller does not carry out the magnetic adjustment to the uniform magnetic roller of axial magnetic field intensity distributions integral body.
Claims (2)
1. the manufacture method of a magnetic roller, be that a manufacture method of magnetic roller is arranged, wherein, described have a magnetic roller to be: make a plurality of bar-shaped magnetic patch circumferentially adjoining each other in the periphery of axle, form cylindric, and a plurality of magnetic poles that extend are vertically arranged on the periphery of cylinder, and this bar-shaped magnetic patch is made by the resin material that magnetic material is blended in the resin binder, it is characterized in that:
Among the magnetic pole of described a plurality of utmost points of described magnetic roller, have at least a pair of adjacently and have the repeller of identical polar, and on the side face between these repellers, be provided with magnetic force and almost be zero, the magnetic force on Zhou Fangxiang distributes smooth zero Gauss's band,
Adopt following method that at least one magnetic patch in the described magnetic patch is made for: the magnetic force that the part that it is included described zero Gauss's band and be adjacent to the repeller of described both sides is magnetized into its axial both ends is lower than the magnetic force of axial central portion, afterwards, this magnetic patch is made up with remaining magnetic patch, thereby form the magnetic roller
This method is: the magnetic patch that has described zero Gauss's band is formed corresponding to the outer peripheral face of axle and section form curved shape and have magnetic pole with the opposite polarity polarity of described repeller in axially extended inner peripheral surface one side, make the side of the both sides of itself and inner peripheral surface adjacency form the magnetic pole that has with the repeller identical polar respectively, thereafter, this magnetic patch is carried out demagnetization
Then, in inner peripheral surface side position in opposite directions yoke is set with magnetic patch, so that this yoke is magnetized into inner peripheral surface with the opposite magnetic of repeller magnetic, with two described side positions in opposite directions yoke is being set, so that this yoke is magnetized into these two sides with the identical magnetic of repeller polarity, and yoke is set in axial two end portions position in opposite directions with the outer peripheral face side, so that this yoke applies with the zero opposite polarity magnetic force of Gauss's band this two end portions, thereby the magnetic force that this magnetic patch is magnetized into its axial both ends is lower than the magnetic force of axial central portion.
2. the manufacture method of magnetic roller as claimed in claim 1 is characterized by:
The described yoke that is configured in the axial two end portions position in opposite directions of magnetic patch outer peripheral face side is disposed obliquely, make it along with away from axial central portion and near the side face of magnetic patch.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001225414 | 2001-07-26 | ||
| JP225414/2001 | 2001-07-26 | ||
| JP387371/2001 | 2001-12-20 | ||
| JP2001387371A JP2003188011A (en) | 2001-12-20 | 2001-12-20 | Method of manufacturing magnet roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1538902A CN1538902A (en) | 2004-10-20 |
| CN100513124C true CN100513124C (en) | 2009-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028147472A Expired - Fee Related CN100513124C (en) | 2001-07-26 | 2002-07-11 | Method for manufacturing magnet roller |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100513124C (en) |
| WO (1) | WO2003011558A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240416A (en) * | 2013-05-03 | 2013-08-14 | 浙江中元磁业股份有限公司 | Method and mould for manufacturing NeFeB (Neodymium iron boron) radiation-orientated ring magnet |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7597188B2 (en) * | 2006-06-12 | 2009-10-06 | Habasit Ag | Belt module with magnetic properties |
| CN103631115A (en) * | 2012-08-22 | 2014-03-12 | 大地磁性材料(香港)有限公司 | Manufacturing method for magnetic roller and system used therein |
| CN106003560A (en) * | 2016-05-25 | 2016-10-12 | 北京小米移动软件有限公司 | Processing technology for magnetic injection molding piece |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6021296A (en) * | 1997-03-06 | 2000-02-01 | Bridgestone Corporation | Magnet roller and manufacturing method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60144911A (en) * | 1984-01-05 | 1985-07-31 | Matsushita Electric Ind Co Ltd | Magnet roll for magnetic brush development |
| JP2512025B2 (en) * | 1987-10-28 | 1996-07-03 | 松下電器産業株式会社 | Magnet roll manufacturing method |
| JP3399625B2 (en) * | 1994-03-31 | 2003-04-21 | 松下電器産業株式会社 | Method of manufacturing roll-shaped magnet for development |
| JP4071371B2 (en) * | 1997-09-26 | 2008-04-02 | 株式会社リコー | Magnet member, method for manufacturing magnet member, magnet structure, magnet device, developing roller, and developing device |
| JP2000153540A (en) * | 1998-11-19 | 2000-06-06 | Bridgestone Corp | Manufacture of resin magnet moldings |
| JP4365923B2 (en) * | 1999-02-15 | 2009-11-18 | キヤノン株式会社 | Apparatus and method for analyzing orientation distribution of magnetic particles |
| JP2002031955A (en) * | 2000-07-17 | 2002-01-31 | Ricoh Co Ltd | Developing roll, its manufacturing method and developing device |
-
2002
- 2002-07-11 CN CNB028147472A patent/CN100513124C/en not_active Expired - Fee Related
- 2002-07-11 WO PCT/JP2002/007073 patent/WO2003011558A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6021296A (en) * | 1997-03-06 | 2000-02-01 | Bridgestone Corporation | Magnet roller and manufacturing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240416A (en) * | 2013-05-03 | 2013-08-14 | 浙江中元磁业股份有限公司 | Method and mould for manufacturing NeFeB (Neodymium iron boron) radiation-orientated ring magnet |
| CN103240416B (en) * | 2013-05-03 | 2015-01-14 | 浙江中元磁业股份有限公司 | Method and mould for manufacturing NeFeB (Neodymium iron boron) radiation-orientated ring magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1538902A (en) | 2004-10-20 |
| WO2003011558A1 (en) | 2003-02-13 |
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