JPH0624173B2 - Mold for magnet manufacturing - Google Patents
Mold for magnet manufacturingInfo
- Publication number
- JPH0624173B2 JPH0624173B2 JP59236774A JP23677484A JPH0624173B2 JP H0624173 B2 JPH0624173 B2 JP H0624173B2 JP 59236774 A JP59236774 A JP 59236774A JP 23677484 A JP23677484 A JP 23677484A JP H0624173 B2 JPH0624173 B2 JP H0624173B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnet
- mold
- permanent magnet
- molding space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、磁石製造用金型に係り、とくにマグネットロ
ール用の永久磁石を射出成型や押し出し成型するのに適
した磁石製造用金型に関する。Description: TECHNICAL FIELD The present invention relates to a magnet manufacturing die, and more particularly to a magnet manufacturing die suitable for injection molding or extrusion molding of a permanent magnet for a magnet roll. .
（従来の技術及び問題点） 従来、静電式複写機等に用いるマグネットロールとし
て、第３図のように円筒体を複数個に分割した断面扇形
の棒状永久磁石１を組み合わせた構造のものがある。こ
のような永久磁石１としてはマグネットロール外周面の
磁極を強力とするために異方性磁石が好ましい。(Prior Art and Problems) Conventionally, as a magnet roll used in an electrostatic copying machine or the like, one having a structure in which a rod-shaped permanent magnet 1 having a fan-shaped cross section in which a cylindrical body is divided into a plurality of parts is combined as shown in FIG. is there. As such a permanent magnet 1, an anisotropic magnet is preferable in order to strengthen the magnetic pole on the outer peripheral surface of the magnet roll.
第４図は異方性を有する永久磁石の一列であって、特開
昭５５−８６１０４号に示されているものである。この
場合、永久磁石１Ａは、厚み方向に異方性を有するシー
ト状磁石材２を湾曲させ積層一体化し、図中矢印のよう
に円弧面３から両側面４に向かう異方性を持たせ、この
異方性の方向に着磁処理を施したものである。このよう
な異方性を持つ永久磁石は、単にマグネットロールの半
径方向に異方性を持つものよりもマグネットロールの磁
極を強力にすることができる。FIG. 4 shows a row of permanent magnets having anisotropy, which is shown in JP-A-55-86104. In this case, in the permanent magnet 1A, the sheet-like magnet material 2 having anisotropy in the thickness direction is curved to be laminated and integrated, and has anisotropy from the arc surface 3 to both side surfaces 4 as indicated by an arrow in the figure. A magnetizing treatment is applied in this anisotropic direction. Such an anisotropic permanent magnet can make the magnetic poles of the magnet roll stronger than those having anisotropy in the radial direction of the magnet roll.
しかし、第４図の永久磁石１Ａは、積層構造であるため
構造に手間がかかり、実用的ではない。However, since the permanent magnet 1A shown in FIG. 4 has a laminated structure, it takes a lot of time to construct the structure and is not practical.
そのため、本出願人において、第５図に示すような金型
１０を用いて、ゴムあるいはその他の樹脂にフェライト
等の磁性粉末を混合した材料を磁界中にて押し出し成型
することにより第６図の断面扇形の成型体である棒状樹
脂永久磁石(樹脂マグネット)１Ｂを得るようにしてい
た。ここで、第５図の金型１０は、円弧面１１と、該円
弧面１１に接しかつ相互に対向する側面１２と、該両側
面１２を結ぶ底面１３とからなる断面扇形の成型用空間
１４を有している。そして、前記円弧面１１の一部を第
１のヨーク１５Ａの先端面で構成するとともに、前記両
側面及び底面を第２のヨーク１５Ｂの先端面で構成して
おり、残りの部分はステンレス等の非磁性材１６となつ
ている。前記ヨーク１５Ａは同一厚みで金型外面に延び
ている。Therefore, the applicant of the present invention uses a mold 10 as shown in FIG. 5 to extrude and mold a material obtained by mixing magnetic powder such as ferrite with rubber or other resin in a magnetic field. The rod-shaped resin permanent magnet (resin magnet) 1B, which is a molded body having a fan-shaped cross section, is obtained. Here, the mold 10 of FIG. 5 has a molding space 14 having a fan-shaped cross section, which is composed of an arcuate surface 11, side surfaces 12 in contact with the arcuate surface 11 and facing each other, and a bottom surface 13 connecting the both side surfaces 12. have. A part of the arcuate surface 11 is formed by the tip end surface of the first yoke 15A, the both side surfaces and the bottom surface are formed by the tip end surface of the second yoke 15B, and the remaining portion is made of stainless steel or the like. It is a non-magnetic material 16. The yoke 15A extends to the outer surface of the mold with the same thickness.
これらの磁性材であるヨーク１５Ａ,１５Ｂ間に磁界を
印加した状態で空間１４内の材料を成型した場合、得ら
れた第６図の永久磁石１Ｂの異方性の方向は第４図の場
合に近似し、該永久磁石１Ｂ自体は、特開昭５８−１０
７６０９号で公知となっている（但し、第５図の金型構
造は本出願人は公開していない）。但し、第６図の場
合、望ましい実線矢印の異方性の方向だけでなく、点線
矢印（径方向）の配向も発生する。When the material in the space 14 is molded while a magnetic field is applied between the yokes 15A and 15B, which are magnetic materials, the anisotropy direction of the obtained permanent magnet 1B in FIG. 6 is as shown in FIG. The permanent magnet 1B itself is similar to that of JP-A-58-10.
No. 7609 is publicly known (however, the mold structure of FIG. 5 is not disclosed by the applicant). However, in the case of FIG. 6, not only the desired anisotropy direction of the solid line arrow but also the orientation of the dotted line arrow (radial direction) occurs.
第５図の従来の金型を用いて押し出し成型した第６図の
樹脂永久磁石の円弧面に現れる磁極の強さは、第４図の
積層構造の永久磁石の場合と同程度かあるいはやや劣る
きらいがあった。その理由は、上述のように、第５図の
従来金型であると、第６図中点線矢印のように径方向に
配向した異方性が発生するためであると考えられる。The strength of the magnetic poles appearing on the arc surface of the resin permanent magnet of FIG. 6 extruded using the conventional die of FIG. I didn't like it. It is considered that the reason is that, as described above, the conventional mold shown in FIG. 5 causes anisotropy oriented in the radial direction as indicated by a dotted arrow in FIG.
（問題点を解決するための手段） 本発明は、上記の点に鑑み、よりいっそう強力な磁極を
有する樹脂永久磁石を得ることが可能な磁石製造用金型
を提供しようとするものである。(Means for Solving the Problems) In view of the above points, the present invention is to provide a magnet manufacturing mold capable of obtaining a resin permanent magnet having an even stronger magnetic pole.
本発明の磁石製造用金型は、円弧面と、該円弧面に接し
かつ相互に対向する側面と、該両側面を結ぶ底面とから
なる成型用空間を有し、金型外面から該成型用空間に向
けてテーパ状に幅が狭くなった第１の磁性ヨークの先端
面で前記円弧面の一部を構成し、前記成型用空間の各側
面の少なくとも一部を第２及び第３の磁性ヨークの先端
面で構成し、前記成型用空間の底面の全てと前記円弧面
及び各側面の残りの面を非磁性材で構成するようにして
いる。The magnet manufacturing die of the present invention has a molding space composed of an arc surface, side surfaces in contact with the arc surface and facing each other, and a bottom surface connecting the both side surfaces. A part of the arcuate surface is formed by the front end surface of the first magnetic yoke that is tapered in width toward the space, and at least a part of each side surface of the molding space is provided with the second and third magnetic materials. All of the bottom surface of the molding space, the arc surface and the remaining surfaces of the side surfaces are made of a non-magnetic material.
（実施例） 以下、本発明に係る磁石製造用金型の実施例を図面に従
って説明する。(Example) Hereinafter, an example of a mold for manufacturing a magnet according to the present invention will be described with reference to the drawings.
第１図において、磁石製造用金型２０は、円弧面２１
と、該円弧面２１に接しかつ相互に対向する側面２２
と、該両側面２２を結ぶ２３とからなる断面扇形の成型
用空間２４を有している。そして、前記円弧面２１の一
部を第１のヨーク２５Ａの先端面で構成し、一方の側面
の大部分を第２のヨーク２５Ｂの先端面で構成し、他方
の側面の大部分を第３のヨーク２５Ｃの先端面で構成
し、残りの部分はステンレス等の非磁性材２６Ａ，２６
Ｂ，２６Ｃとなっている。すなわち、磁性材であるヨー
ク全体は３極構造であり、ヨーク２５Ａは金型外面から
成型用空間２４に向かって幅の狭くなるテーパー状断面
を有している。これは、得られる永久磁石の円弧面の磁
界を部分的に強力にするのに有効である。また、ヨーク
２５Ｂ，２５Ｃの先端面が、第５図のヨーク１５Ｂと違
い、成型用空間２４の左右側面２２の大部分を構成し、
底面は全て非磁性材２６Ｃとなっているため、成型用空
間２４の円弧面から両方の側面２２に集中して配向され
ることになって（配向度を増すことになって）、得られ
る永久磁石の円弧面における表面磁束密度をよりいっそ
う強くすることができる。In FIG. 1, a magnet manufacturing die 20 has an arc surface 21.
And side surfaces 22 that are in contact with the arcuate surface 21 and face each other.
And a molding space 24 having a fan-shaped cross section, which is formed by connecting the side surfaces 22 with each other. A part of the arcuate surface 21 is formed by the tip surface of the first yoke 25A, most of one side surface is formed by the tip surface of the second yoke 25B, and most of the other side surface is formed by the third surface. Of the non-magnetic material 26A, 26 made of stainless steel or the like.
B and 26C. That is, the entire yoke, which is a magnetic material, has a three-pole structure, and the yoke 25A has a tapered cross section whose width decreases from the outer surface of the mold toward the molding space 24. This is effective in partially strengthening the magnetic field of the arc surface of the obtained permanent magnet. Further, unlike the yoke 15B of FIG. 5, the tip surfaces of the yokes 25B and 25C constitute most of the left and right side surfaces 22 of the molding space 24,
Since the bottom surface is entirely made of non-magnetic material 26C, it is concentrated and oriented from the arc surface of the molding space 24 to both side surfaces 22 (increasing the degree of orientation), resulting in a permanent magnet. The surface magnetic flux density on the arc surface of the magnet can be further increased.
それらのヨーク２５Ａとヨーク２５Ｂ,２５Ｃ間に磁界
を印加した状態で空間２４内の材料(ゴムあるいはその
他の樹脂にフェライト等の磁性粉末を混合した材料)を
射出成型した場合、得られた第２の断面扇形の棒状樹脂
永久磁石１Ｃの異方性の方向は第７図の実線矢印のよう
になり、従来の第６図の点線矢印のように径方向に配向
していた部分をも両方の側面４に向けて集中させること
ができ、第６図の従来のものよりも配向度が向上するた
め、円弧面３の磁極の表面磁束密度は第４図及び第６図
（第５図の金型によるもの）の場合よりも向上する。When the material in the space 24 (material in which magnetic powder such as ferrite is mixed with rubber or other resin) is injection-molded while a magnetic field is applied between the yoke 25A and the yokes 25B and 25C, the second obtained The direction of anisotropy of the rod-shaped resin permanent magnet 1C having a fan-shaped cross section is as shown by the solid line arrow in FIG. 7, and the portion that has been oriented in the radial direction as shown by the dotted line arrow in FIG. Since it can be concentrated toward the side surface 4 and the orientation degree is improved as compared with the conventional one shown in FIG. 6, the surface magnetic flux density of the magnetic pole of the arc surface 3 is shown in FIGS. 4 and 6 (gold in FIG. 5). It is better than the case of (by type).
以上の表に本実施例による断面扇形の棒状永久磁石１Ｃ
の円弧面３の磁極の表面磁束密度(Ｇ)と、円弧面３にお
ける配向度(円弧面に対し垂直な方向についてのもの)及
び側面４における配向度(側面に垂直な方向についての
もの)とを、第４図の従来例１及び第５図の従来例２の
場合と比較して示す。The bar-shaped permanent magnet 1C having a fan-shaped cross section according to this embodiment is shown in the above table.
The surface magnetic flux density (G) of the magnetic poles on the arc surface 3, and the orientation degree on the arc surface 3 (in the direction perpendicular to the arc surface) and the orientation degree on the side surface 4 (in the direction perpendicular to the side surface). Is shown in comparison with the case of the conventional example 1 in FIG. 4 and the conventional example 2 in FIG.
以上の表より、第１図の金型を使用して磁界中で射出成
型を実行した実施例の場合、円弧面の配向度及び側面の
配向度はともに５０％以上となり、従来例とくに従来例
２場合に比べ配向度の大幅向上を図ることができ、ひい
ては円弧面に現れた磁極の表面磁束密度を従来よりもか
なり高い１７００Ｇ程度にすることが可能なことがわか
る。 From the above table, in the case of the embodiment in which the injection molding is performed in the magnetic field using the mold of FIG. 1, both the degree of orientation of the arc surface and the degree of orientation of the side surface are 50% or more. It can be seen that the degree of orientation can be significantly improved as compared with the case of 2, and the surface magnetic flux density of the magnetic poles appearing on the arc surface can be made to be about 1700 G, which is considerably higher than the conventional one.
なお、上記実施例により得られた断面扇形の棒状樹脂永
久磁石１Ｃを第８図のように複数個組み合わせた場合、
両方の側面４の配向度が高いため、隣接する永久磁石の
磁極同士の磁路が短くなり、さらに強力な磁極を構成で
きる。When a plurality of rod-shaped resin permanent magnets 1C having a fan-shaped cross section obtained in the above embodiment are combined as shown in FIG.
Since the degree of orientation of both side surfaces 4 is high, the magnetic path between the magnetic poles of adjacent permanent magnets is shortened, and a stronger magnetic pole can be formed.
また、上記実施例では、第１図の金型で射出成型した場
合で説明したが押し出し成型をした場合にも同様な特性
の向上が得られる。Further, in the above-mentioned embodiment, the case of injection molding with the mold shown in FIG. 1 has been described, but the same improvement in characteristics can be obtained when extrusion molding is performed.
（発明の効果） 以上説明したように、本発明の磁石製造用金型によれ
ば、円弧面と、該円弧面に接しかつ相互に対向する側面
と、該両側面を結ぶ底面とからなる成型用空間を有し、
金型外面から該成型用空間に向けてテーパー状に幅が狭
くなった第１の磁性ヨークの先端面で前記円弧面の一部
を構成し、前記成型用空間の各側面の少なくとも一部を
第２及び第３の磁性ヨークの先端面で構成し、前記成型
用空間の底面の全てと前記円弧面及び各側面の残りの面
を非磁性材で構成したので、強力な磁極を有するマグネ
ットロール等に好適な樹脂永久磁石を得ることが可能で
ある。(Effects of the Invention) As described above, according to the magnet manufacturing die of the present invention, the molding including the arc surface, the side surfaces in contact with the arc surface and facing each other, and the bottom surface connecting the both side surfaces. Has a space for
A part of the arcuate surface is formed by the front end surface of the first magnetic yoke that is tapered in width from the outer surface of the die toward the molding space, and at least a part of each side surface of the molding space is formed. A magnet roll having strong magnetic poles because it is composed of the tip surfaces of the second and third magnetic yokes, and all of the bottom surface of the molding space and the arc surface and the remaining surface of each side surface are composed of a non-magnetic material. It is possible to obtain a resin permanent magnet suitable for the above.
第１図は本発明に係る磁石製造用金型の実施例を示す側
断面図、第２図は得られた永久磁石を示す斜視図、第３
図は断面扇形の永久磁石を組み合わせた従来のマグネッ
トロールの一例を示す側断面図、第４図は従来の積層構
造の永久磁石を示す側面図、第５図は本出願人が従来用
いていた金型を示す側断面図、第６図は第５図の金型で
得られた永久磁石の側面図、第７図は本発明の実施例で
得られた永久磁石の側面図、第８図は実施例の永久磁石
を複数個組み合わせた状態の側面図である。 １,１Ａ,１Ｂ,１Ｃ……永久磁石、３……円弧面、４…
…側面、２０……磁石製造用金型、２１……円弧面、２
２……側面、２３……底面、２４……成型用空間、２５
Ａ,２５Ｂ,２５Ｃ……ヨーク、２６……非磁性材。FIG. 1 is a side sectional view showing an embodiment of a magnet manufacturing die according to the present invention, FIG. 2 is a perspective view showing the obtained permanent magnet, and FIG.
The figure is a side sectional view showing an example of a conventional magnet roll in which permanent magnets having a fan-shaped cross section are combined, FIG. 4 is a side view showing a conventional permanent magnet having a laminated structure, and FIG. 5 is a conventional one used by the present applicant. FIG. 6 is a side sectional view showing a die, FIG. 6 is a side view of a permanent magnet obtained by the die of FIG. 5, FIG. 7 is a side view of a permanent magnet obtained by an embodiment of the present invention, and FIG. [Fig. 3] is a side view showing a state in which a plurality of permanent magnets of the embodiment are combined. 1, 1A, 1B, 1C ... Permanent magnet, 3 ... Arc surface, 4 ...
… Side face, 20 …… Metal manufacturing die, 21 …… Arc surface, 2
2 ... side surface, 23 ... bottom surface, 24 ... molding space, 25
A, 25B, 25C ... Yoke, 26 ... Non-magnetic material.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｌ 31:34 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location B29L 31:34
Claims (1)
する側面と、該両側面を結ぶ底面とからなる成型用空間
を有し、金型外面から該成型用空間に向けてテーパー状
に幅が狭くなった第１の磁性ヨークの先端面で前記円弧
面の一部を構成し、前記成型用空間の各側面の少なくと
も一部を第２及び第３の磁性ヨークの先端面で構成し、
前記成型用空間の底面の全てと前記円弧面及び各側面の
残りの面を非磁性材で構成したことを特徴とする磁石製
造用金型。1. A molding space having a circular arc surface, side surfaces in contact with the circular arc surface and facing each other, and a bottom surface connecting the both side surfaces, and a taper from the outer surface of the mold toward the molding space. The front end surface of the first magnetic yoke having a narrow width forms a part of the arc surface, and at least a part of each side surface of the molding space is formed by the front end surfaces of the second and third magnetic yokes. Configure and
A magnet manufacturing mold, wherein all of the bottom surface of the molding space, the arcuate surface, and the remaining surfaces of each side surface are made of a non-magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59236774A JPH0624173B2 (en) | 1984-11-12 | 1984-11-12 | Mold for magnet manufacturing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59236774A JPH0624173B2 (en) | 1984-11-12 | 1984-11-12 | Mold for magnet manufacturing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61115316A JPS61115316A (en) | 1986-06-02 |
| JPH0624173B2 true JPH0624173B2 (en) | 1994-03-30 |
Family
ID=17005592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59236774A Expired - Lifetime JPH0624173B2 (en) | 1984-11-12 | 1984-11-12 | Mold for magnet manufacturing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0624173B2 (en) |
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| 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 |
| JP6536289B2 (en) * | 2014-09-30 | 2019-07-03 | 日亜化学工業株式会社 | Bond magnet, bond magnet piece and method of manufacturing bond magnet |
| JP2020140998A (en) * | 2019-02-27 | 2020-09-03 | 株式会社玉川製作所 | Structure of pole piece and mold of electromagnet for molding machine in magnetic field used for manufacturing tile-like anisotropic magnet radially oriented to both ends |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5194406A (en) * | 1975-02-19 | 1976-08-19 | JISEIFUNMATSUSEIKEIPURESUYOKANAGATA | |
| JPS6028377B2 (en) * | 1979-02-08 | 1985-07-04 | 松下電器産業株式会社 | Manufacturing method for rolled magnets |
| JPS55138218A (en) * | 1979-04-12 | 1980-10-28 | Matsushita Electric Ind Co Ltd | Magnetic field oriented metal mold |
| JPS58107609A (en) * | 1981-12-21 | 1983-06-27 | Tdk Corp | Magnet and apparatus of the same |
-
1984
- 1984-11-12 JP JP59236774A patent/JPH0624173B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9583244B2 (en) | 2014-09-30 | 2017-02-28 | Nichia Corporation | Bonded magnet, bonded magnet component, and bonded magnet production method |
| US10832863B2 (en) | 2014-09-30 | 2020-11-10 | Nichia Corporation | Bonded magnet, bonded magnet component, and bonded magnet production method |
| EP3002854B1 (en) * | 2014-09-30 | 2020-12-23 | Nichia Corporation | Bonded magnet and production method thereof |
| US11735358B2 (en) | 2014-09-30 | 2023-08-22 | Nichia Corporation | Bonded magnet, bonded magnet component, and bonded magnet production method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61115316A (en) | 1986-06-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| EXPY | Cancellation because of completion of term |