JPH07111924B2 - Magnetic roll and method for manufacturing cylindrical magnet for magnetic roll - Google Patents
Magnetic roll and method for manufacturing cylindrical magnet for magnetic rollInfo
- Publication number
- JPH07111924B2 JPH07111924B2 JP59073191A JP7319184A JPH07111924B2 JP H07111924 B2 JPH07111924 B2 JP H07111924B2 JP 59073191 A JP59073191 A JP 59073191A JP 7319184 A JP7319184 A JP 7319184A JP H07111924 B2 JPH07111924 B2 JP H07111924B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnet
- magnetic roll
- cylindrical magnet
- roll
- 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
Description
【発明の詳細な説明】 〔技術分野〕 本発明は、乾式現像装置用磁気ロールの改良に関するも
のである。TECHNICAL FIELD The present invention relates to an improvement of a magnetic roll for a dry developing device.
従来の乾式用磁気ブラシ現像装置は、磁気ロール、等方
性フエライト磁石またはゴム磁石を用いていた。近時現
像装置の小型化、高画質化、または、低コスト化など求
望されて来た。このため、本発明者等はすでに特開昭57
−72162号で磁気ブラシ現像装置を提案した。しかし本
案は、次のような欠点を有していた。A conventional dry magnetic brush developing device uses a magnetic roll, an isotropic ferrite magnet, or a rubber magnet. Recently, there has been a demand for smaller size, higher image quality, and lower cost of the developing device. Therefore, the present inventors have already disclosed in
-72162 proposed a magnetic brush developing device. However, this proposal had the following drawbacks.
一軸異方性希土類樹脂結合結合型磁石を配向させ、
圧縮プレス法でつくるため、薄い厚さのものができにく
い。Orient the uniaxially anisotropic rare earth resin bond-bonded magnet,
Since it is made by the compression press method, it is difficult to make thin ones.
大きさの制限がある。 There is a size limit.
柱状芯に巻きつけるため、接着硬化するなど工程が
はん雑であり、量産性に劣る。Since it is wound around a columnar core, the process such as adhesion and hardening is complicated, and mass productivity is poor.
本発明はこのような問題点を解決するもので、その目的
とするところは、磁気ロール用磁石量産性を高め且つ低
コスト化をはかる。また他の目的は小型、軽量化を容易
にする。The present invention solves such a problem, and an object of the present invention is to enhance the mass productivity of magnets for magnetic rolls and reduce the cost. Another purpose is to facilitate miniaturization and weight reduction.
本発明の磁気ロール用磁石は、希土類金属間化合物樹脂
ボンド（結合）磁石で、異方性はラジアル方向にあり、
且つその製造法は、押出成形でつくることに特徴があ
る。The magnet for a magnetic roll of the present invention is a rare earth intermetallic compound resin bonded magnet, and the anisotropy is in the radial direction,
Moreover, the manufacturing method is characterized in that it is produced by extrusion molding.
磁石粉末は50vol％以下では、磁気特性が低くなり（|BH
|max.4MGoe以下では、フエライト磁石と変わらない）ま
た、80vol％以上になると、ラジアル異方性化及び、押
出成形のスピードが遅くなり生産性が悪くなるためであ
る。バインダーである樹脂の材質は、熱可塑性樹脂又は
熱硬化性樹脂のいずれでもかまわない。次に異方性方向
は、円筒磁石に対してラジアル（径）方向に放射状に磁
石粉末を配向させなければならず、且つダイス型内の空
間部磁場強さは、6Koe〜30Koe工業的に量産する上では
より低い方が良いが、磁気性能への影響があるため、好
ましくは2,0Koe以下〜8Koe付近である。When the magnetic powder is 50 vol% or less, the magnetic properties become low (| BH
| max.4MGoe or less does not change from ferrite magnets.) Further, if it is 80 vol% or more, radial anisotropy and extrusion molding speed become slow, resulting in poor productivity. The material of the resin as the binder may be either a thermoplastic resin or a thermosetting resin. Next, in the anisotropic direction, the magnet powder must be oriented radially in the radial direction with respect to the cylindrical magnet, and the magnetic field strength in the space inside the die is 6 Koe to 30 Koe industrially mass-produced. However, it is preferably not more than 2.0 Koe and in the vicinity of 8 Koe because it affects the magnetic performance.
第１図は、原理的な磁気プラン現像装置の磁気ロールの
構成である。１はトナーを蓄積するホツバー、２はトナ
ー積高さを制御するドクタープレードで、５の非磁性材
料でつくられたスリーブ内に、磁石３が、６のシャフト
に固定された構成になつている。FIG. 1 shows the structure of a magnetic roll of a magnetic plan developing device in principle. Reference numeral 1 is a hot bar for accumulating toner, 2 is a doctor blade for controlling the toner stack height, and a magnet 3 is fixed to a shaft of 6 in a sleeve made of a non-magnetic material of 5. .
磁気ロール３は、表面で500〜1300ガウスの磁束密度を
実現するため、等方性フエライト磁石が使われている。
また、ほとんど６極,8極など多極着磁を行つているた
め、等方性磁石を使用している。このため大型となり重
量が重くなり装置のコンパクト化のためには、現状の磁
気ロール用磁石は、問題があつた。本発明者等は、第３
図A,Bに示す磁気ロールを提案することにより従来の欠
点を解決できることを見出した。The magnetic roll 3 uses an isotropic ferrite magnet in order to realize a magnetic flux density of 500 to 1300 gauss on the surface.
Also, since most of the magnets are multi-pole magnetized such as 6 poles and 8 poles, isotropic magnets are used. Therefore, in order to make the apparatus large and heavy and the apparatus compact, the current magnetic roll magnet has a problem. The present inventors
We have found that the conventional defects can be solved by proposing the magnetic rolls shown in FIGS.
先ず磁石粉末は次のようにして製造した。First, the magnet powder was manufactured as follows.
原子比組成でSm（CobalCu0.07Fe0.33Zr0.016）7.5なる
組成の合金を、Ar雰囲気下低周波溶解炉によつて溶解し
合金を得た。次に磁気硬化を目的に、やはりArガス雰囲
気炉中で、次の条件で熱処理を行つた。An alloy with an atomic ratio of Sm (Co bal Cu 0.07 Fe 0.33 Zr 0.016 ) 7.5 was melted in a low-frequency melting furnace in an Ar atmosphere to obtain an alloy. Next, for the purpose of magnetic hardening, heat treatment was performed under the following conditions also in an Ar gas atmosphere furnace.
溶体化−1150℃×24時間 時 効− 800℃×16時間 熱処理後合金インゴツトは、トツプグラインダーで粗粉
砕し、アトライターミルで微粉砕し３μｍ〜80μｍの粉
末を得た。次に粉末とバインダーとしてナイロン12を混
合した。混合比率は磁石粉末65容量％、残部ナイロン12
とし、混練材で温度280℃に加熱バインダーは溶融混練
し、コンパウンドとした。コンパウンドは、第２図に示
す。押出成形装置に、装入され、磁気ロールをラジアル
配向しながら製造した。Solution heat treatment-1150 ° C x 24 hours Aging-800 ° C x 16 hours After heat treatment, the alloy ingot was roughly pulverized with a top grinder and finely pulverized with an attritor mill to obtain a powder of 3 µm to 80 µm. Next, the powder and nylon 12 as a binder were mixed. Mixing ratio is 65% by volume of magnet powder, balance nylon 12
Then, the binder was melted and kneaded at a temperature of 280 ° C. with a kneading material to form a compound. The compound is shown in FIG. The magnetic roll was charged into an extrusion molding apparatus and manufactured while radially orienting the magnetic roll.
コンパウンド14は、13のバレル内に装入され12のスクリ
ユーにより、前方に運ばれる。ここで、16のヒーターで
19ダイス部は約260℃±３に加熱される。コンパウンド
は流動物となり、17,18のコイルにDC通電されるため矢
印のごとく磁場が放射状に発生する。この磁場中を通過
することにより異方性を付与され且つ、20の断熱材を介
して、21部で水冷却され固化された円筒状磁石が出来上
がる。Compound 14 is loaded into 13 barrels and carried forward by 12 screws. Where 16 heaters
19 Die part is heated to about 260 ℃ ± 3. The compound becomes a fluid and DC current is applied to the coils of 17 and 18, so that a magnetic field is radially generated as shown by the arrow. By passing through this magnetic field, anisotropy is imparted, and a cylindrical magnet that is water-cooled and solidified at 21 parts through 20 heat insulating materials is completed.
本発明方法で出来た磁石寸法は、外径30m/m、内径26m/
m、長さ約300m/mに切断した。The dimensions of the magnet made by the method of the present invention are an outer diameter of 30 m / m and an inner diameter of 26 m / m.
It was cut into m and a length of about 300 m / m.
なお基礎的な磁気性能は次の通りであつた。The basic magnetic performance was as follows.
なお比較例のフエライト磁石は、|BH|max1.1MGoeと低い
ものであつた。 The ferrite magnet of the comparative example had a low value of | BH | max1.1MGoe.
本発明法の磁石を磁気ロールに組み立てたものが、第３
図A,Bに示してある。Assembling the magnet of the method of the present invention into a magnetic roll is the third
This is shown in Figures A and B.
第３図A,Bは、磁気ロールの断面図であり、８はラジア
ル（放射状）異方性を示す。該磁石８は、７のアルミス
リーブと９−ａのアルミ枠でサンドイツチされ、その両
サイド９−ｂは11の回転シヤフトで固定された構造にな
つている。3A and 3B are cross-sectional views of a magnetic roll, and 8 indicates radial (radial) anisotropy. The magnet 8 is sandwiched between an aluminum sleeve 7 and an aluminum frame 9-a, and both sides 9-b thereof are fixed by 11 rotary shafts.
10は中空部である。従来品の磁気ロールに比べコストは
約1/2、重量は1/4に軽量化できた。10 is a hollow part. The cost is about 1/2 and the weight is 1/4 compared with the conventional magnetic roll.
本実施例では、着磁は８極で行なつたが、磁石の厚みが
ｔ＝2m/mと薄いこと、及びラジアル異方性を付与したこ
とによつて、磁気特性の角型性が向上したため、着磁し
易い材料であつた。In this example, the magnetization was performed with 8 poles, but the squareness of the magnetic characteristics was improved by the fact that the magnet had a thin thickness of t = 2 m / m and the radial anisotropy was imparted. Therefore, the material was easily magnetized.
以上詳述したように本発明は、磁気特性を向上でき
る、薄肉磁石ができることによつて、磁気ロールの軽
量化を容易に達成できる上、小型軽量化及び低コスト化
できるなど、工業的に大変役立つものである。このよう
な効果を有するため、磁気ブラシ用ロール磁石、あるい
は中型モーター用磁石などに利用できる。INDUSTRIAL APPLICABILITY As described in detail above, the present invention is capable of improving the magnetic characteristics, and by being able to form a thin magnet, it is possible to easily achieve the weight reduction of the magnetic roll, and also to reduce the size and weight and the cost, which is industrially very difficult It is useful. Since it has such an effect, it can be used as a roll magnet for a magnetic brush, a magnet for a medium-sized motor, or the like.
第１図は、従来の磁気ブラシ現像装置及び磁気ロールの
断面図。 第２図は、本発明における磁気ロール用磁石の押出成形
方法を示す図。 第３図A,Bは、本発明磁気ロールの断面図。FIG. 1 is a sectional view of a conventional magnetic brush developing device and a magnetic roll. FIG. 2 is a diagram showing an extrusion molding method of a magnet for a magnetic roll according to the present invention. 3A and 3B are sectional views of the magnetic roll of the present invention.
Claims (2)
つくられたスリーブとからなり、乾式トナー現像を行う
磁気ブラシ現像装置で使用する磁気ロールにおいて、 結晶異方性磁石粉末と結合材からなる混合物をラジアル
異方性に配向させる樹脂結合法（焼結法を除く。）によ
りえられた前記円筒状磁石と前記回転シャフトとをアル
ミ枠が固定し、前記円筒状磁石と前記回転シャフトとの
間に円筒状の空間を有することを特徴とする磁気ロー
ル。1. A magnetic roll comprising a cylindrical magnet, a rotating shaft and a sleeve made of a non-magnetic material, which is used in a magnetic brush developing device for dry toner development, comprising crystalline anisotropic magnet powder and a binder. An aluminum frame fixes the cylindrical magnet and the rotary shaft, which are obtained by a resin bonding method (excluding the sintering method) for orienting the resulting mixture in radial anisotropy, and the cylindrical magnet and the rotary shaft are A magnetic roll having a cylindrical space between the magnetic rolls.
合物を磁場中で押出成形してつくられる磁気ロール用円
筒状磁石の製造方法において、 前記磁石粉末は50〜80容量％の結晶異方性希土類磁石粉
末であり、残部が有機物樹脂結合材からなる混合物を、
加熱工程、冷却工程およびラジアル磁場配向工程を断熱
部を有するダイス中で押出成形してつくられることを特
徴とする磁気ロール用円筒状磁石の製造方法。2. A method for manufacturing a cylindrical magnet for a magnetic roll, which is produced by extruding a mixture of magnet powder and an organic resin binder in a magnetic field, wherein the magnet powder is 50-80% by volume of crystal anisotropic material. Of rare earth magnet powder, the balance consisting of organic resin binder,
A method for producing a cylindrical magnet for a magnetic roll, comprising a step of heating, a step of cooling, and a step of orienting a radial magnetic field by extrusion molding in a die having a heat insulating portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59073191A JPH07111924B2 (en) | 1984-04-12 | 1984-04-12 | Magnetic roll and method for manufacturing cylindrical magnet for magnetic roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59073191A JPH07111924B2 (en) | 1984-04-12 | 1984-04-12 | Magnetic roll and method for manufacturing cylindrical magnet for magnetic roll |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8225646A Division JP2768356B2 (en) | 1996-08-27 | 1996-08-27 | Method for manufacturing resin-bonded magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60216512A JPS60216512A (en) | 1985-10-30 |
| JPH07111924B2 true JPH07111924B2 (en) | 1995-11-29 |
Family
ID=13510998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59073191A Expired - Lifetime JPH07111924B2 (en) | 1984-04-12 | 1984-04-12 | Magnetic roll and method for manufacturing cylindrical magnet for magnetic roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07111924B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5229738A (en) * | 1987-06-16 | 1993-07-20 | Kinetron B.V. | Multipolar rotor |
| WO1990016017A1 (en) * | 1989-06-21 | 1990-12-27 | Seiko Epson Corporation | Developing apparatus |
| JP3120451B2 (en) * | 1989-06-21 | 2000-12-25 | セイコーエプソン株式会社 | Developing device |
| JP4019522B2 (en) * | 1998-10-13 | 2007-12-12 | セイコーエプソン株式会社 | Method for manufacturing sintered body |
| US7883662B2 (en) | 2007-11-15 | 2011-02-08 | Viper Technologies | Metal injection molding methods and feedstocks |
| US8124187B2 (en) | 2009-09-08 | 2012-02-28 | Viper Technologies | Methods of forming porous coatings on substrates |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55157218A (en) * | 1979-05-28 | 1980-12-06 | Hitachi Metals Ltd | Magnet roll |
| JPS5626414A (en) * | 1979-08-09 | 1981-03-14 | Hitachi Metals Ltd | Permanent magnet roll |
-
1984
- 1984-04-12 JP JP59073191A patent/JPH07111924B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60216512A (en) | 1985-10-30 |
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