JP2001138351A - Method of molding cylindrical magnet rubber - Google Patents
Method of molding cylindrical magnet rubberInfo
- Publication number
- JP2001138351A JP2001138351A JP32352899A JP32352899A JP2001138351A JP 2001138351 A JP2001138351 A JP 2001138351A JP 32352899 A JP32352899 A JP 32352899A JP 32352899 A JP32352899 A JP 32352899A JP 2001138351 A JP2001138351 A JP 2001138351A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- ring
- rubber ring
- cylindrical magnet
- molding
- 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.)
- Granted
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)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、磁力が高く円周状
に磁性バラツキの少ない円筒形をしたマグネットゴムの
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cylindrical magnet rubber having a high magnetic force and a small magnetic variation around the circumference.
【0002】[0002]
【従来の技術】従来、磁性を有するゴム環の製造にあっ
ては、磁性粉を適量ゴム材料に混合した後ロールのシー
ティングにより平板状の未加硫ゴム生地を形成し、この
板状未加硫ゴム生地を適当幅と長さに裁断してリング状
に繋ぎ合わせ、この未加硫リング生地を金型に供給して
成形していたが、その継ぎ目部分が起因して周上で磁性
のバラツキ発生するため、昨今では未加硫ゴム生地をリ
ング状に打抜いて生地リングを形成し、これを金型へ供
給して圧縮成型せしめ円周状の磁性ゴム環を形成するも
のへと変わって来ている。また、作業性と成型性の向上
を期待して、磁性粉を含む未加硫ゴム生地を成形型内へ
中心部から直接注入して加熱成型せしめ、円周状の磁性
ゴム環を成型する射出成型方法も広く用いられるように
なっている。また、コイルへの通電によって磁界を形成
し、この磁界中で磁性粉を含む未加硫ゴム生地を型によ
って成形し、磁性粉を一方向に整列させる成型方法も実
施することが可能である。2. Description of the Related Art Conventionally, in producing a rubber ring having magnetism, an appropriate amount of magnetic powder is mixed with a rubber material, and then sheet-shaped rolls are used to form a flat unvulcanized rubber material. The vulcanized rubber fabric was cut to an appropriate width and length, joined together in a ring shape, and this unvulcanized ring fabric was supplied to a mold and molded. Due to the occurrence of variations, these days, unvulcanized rubber dough is punched into a ring to form a dough ring, which is supplied to a mold and compressed and formed to form a circumferential magnetic rubber ring. Are coming. In addition, with the expectation of improved workability and moldability, unvulcanized rubber dough containing magnetic powder is directly injected into the mold from the center and heated and molded to form a circular magnetic rubber ring. Molding methods have also been widely used. It is also possible to carry out a molding method in which a magnetic field is formed by energizing the coil, the unvulcanized rubber material containing the magnetic powder is molded by a mold in the magnetic field, and the magnetic powder is aligned in one direction.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うなゴム材料を混練し、ロールシーティングを行ない、
平板状生地から打抜き形成した成型方法にあっては、前
記ロールシーティングによる平板状生地の方向性が成形
物にそのまま現われ、磁力がバラツキ、周上に均一とな
らない大きな欠点を有している。また、未加硫ゴム生地
を成形型内へ注入成型する射出成型方法では、ゴム粘度
を低くして射出注入しなければ外観上も精度上も満足す
るものが得られないが、ここでの場合、強い磁気を得る
ためにゴム材料に磁性粉を多量に混合してあるため生地
の硬度がどうしても高くなるから作業性が極めて悪くな
り、とても実用化できる水準に達しているとは云い難い
ものであった。そして、磁界中での成型においては、磁
界発生装置と金型との組合せ構造が大がかりで複雑にな
るのは避けられず、これを用いた成形作業性も極端に悪
くなるので製造コストに負担を掛ける大きな要因となっ
ていた。However, such a rubber material is kneaded, and roll sheeting is performed.
The molding method of stamping and forming from a plate-like material has a large defect that the directionality of the plate-like material by the roll sheeting appears as it is on the molded product, the magnetic force varies, and the circumference is not uniform. In addition, in the injection molding method in which unvulcanized rubber material is injected and molded into a mold, it is not possible to obtain satisfactory appearance and accuracy unless the rubber viscosity is reduced and injection is performed. Because a large amount of magnetic powder is mixed with the rubber material to obtain strong magnetism, the hardness of the dough is inevitably increased, so the workability is extremely poor, and it is difficult to say that it has reached a level that can be practically used. there were. In molding in a magnetic field, it is inevitable that the combined structure of the magnetic field generator and the mold is large and complicated, and the molding workability using this is extremely deteriorated, so that a burden is imposed on the manufacturing cost. It was a big factor to multiply.
【0004】本発明はこのような欠点に鑑み、円筒形ゴ
ム環の磁力特性を円周方向に均一にするためにゴム材料
と磁性粉を均一に流してバラツキの少ないマグネットゴ
ム環を形成する製造方法を提供することを目的としてい
る。In view of the above drawbacks, the present invention provides a method of forming a magnet rubber ring having a small variation by uniformly flowing a rubber material and magnetic powder in order to make the magnetic force characteristics of a cylindrical rubber ring uniform in the circumferential direction. It is intended to provide a way.
【0005】[0005]
【課題を解決しようとする手段】本発明を図面に基づい
て説明すると、図4に示すような円筒形をしたマグネッ
トゴムAの成形方法であって、フェライト等の磁性粉を
混合し、押し出し機によって紐状に押し出し形成された
ゴム生地を用意し、前記ゴム生地を切断した両端面に傾
斜部を形成してその両端面の傾斜部を接合し合い、図1
に示すように成形物の中心径とほぼ同形のゴム環1を形
成せしめ、下金型2aへ刻設したキャビティ21aの入
口部に前記ゴム環1の載置される溝部22aを設けると
共に、該溝部22aの両側部を外方に向かって開くテー
パー形状とし、図2に示すように前記溝部22aのテー
パー形状に合わされる凸部32aを持つ上金型3aと組
み合わされ、この上・下金型3a、2aの間に前記ゴム
環1を投入し、図3に示すように圧縮加熱せしめて形成
することを特徴としている。The present invention will be described with reference to the accompanying drawings. This is a method for molding a magnet rubber A having a cylindrical shape as shown in FIG. A rubber material extruded in a string shape is prepared, and inclined portions are formed on both end surfaces obtained by cutting the rubber material, and the inclined portions on both end surfaces are joined to each other.
As shown in FIG. 5, a rubber ring 1 having substantially the same shape as the center diameter of the molded product is formed, and a groove 22a on which the rubber ring 1 is placed is provided at the entrance of a cavity 21a cut into the lower mold 2a. Both sides of the groove 22a are tapered so as to open outward, and are combined with an upper mold 3a having a projection 32a that matches the taper of the groove 22a as shown in FIG. It is characterized in that the rubber ring 1 is charged between 3a and 2a and is formed by compression and heating as shown in FIG.
【0006】また、図1に示すように前記ゴム環1の紐
の直径は円筒形マグネットゴムAのゴム部厚さの3〜1
0倍の太さに形成することを特徴としている。As shown in FIG. 1, the diameter of the string of the rubber ring 1 is 3 to 1 of the thickness of the rubber portion of the cylindrical magnet rubber A.
It is characterized in that it is formed to have a thickness of 0 times.
【0007】[0007]
【発明の実施の形態】本発明は上記したように、磁性粉
を混合した未加硫ゴムを押し出し機を用いて押し出し形
成し、これを適当寸法に切断・接合してOリング状に形
成する時、その接合面に傾斜を形成してこれらを接続せ
しめリング状のゴム環1を形成しており、このようにし
て形成された前記ゴム環1を上下に分割された上金型3
aと下金型2aをもって軸方向に加熱圧縮せしめ円筒形
マグネットゴムAを造形している。これを形成する金型
は、下金型2aのキャビティ21aの入口部にテーパー
形状の溝部22aを形成し、この溝部22aと合わされ
る凸部32aを持った上金型3aとを組み合わせる。そ
して成形にあっては、前記下金型2aの溝部22aへゴ
ム環1を投入し、上金型3aの凸部32aをもって前記
ゴム環1を圧縮してキャビティ21a内に押し込み充填
せしめると、ゴム材料中の磁性粉が円筒の軸方向へ平行
に並ぶ状態となって流れ一つの方向性をもって充填され
る。このとき紐状のゴム環1を円筒部へ圧縮充填するの
でゴム圧が高く確保され、キャビティ21aのすみずみ
まで流れ充填され良好な成形性を得られる効果も発す
る。このような製造方法によって形成した円筒形マグネ
ットゴムAは、その外周に着磁を施すと、高い磁力を発
揮し円周状に磁性のバラツキの少ない磁石が形成できる
ものとなる。BEST MODE FOR CARRYING OUT THE INVENTION As described above, the present invention extrudes unvulcanized rubber mixed with magnetic powder using an extruder, and cuts and joins it to an appropriate size to form an O-ring. At this time, a slant is formed on the joint surface and these are connected to form a ring-shaped rubber ring 1. The rubber ring 1 thus formed is divided into upper and lower molds 3.
a and the lower mold 2a are axially heated and compressed to form a cylindrical magnet rubber A. In the mold for forming the groove, a tapered groove 22a is formed at the entrance of the cavity 21a of the lower mold 2a, and the upper mold 3a having a convex portion 32a to be fitted with the groove 22a is combined. In molding, the rubber ring 1 is put into the groove 22a of the lower mold 2a, and the rubber ring 1 is compressed by the convex portion 32a of the upper mold 3a and pushed into the cavity 21a to be filled. The magnetic powder in the material is arranged in parallel in the axial direction of the cylinder, and flows with one direction. At this time, since the cord-shaped rubber ring 1 is compression-filled into the cylindrical portion, a high rubber pressure is ensured, and the flow is filled up to every corner of the cavity 21a, so that good moldability can be obtained. When the outer periphery of the cylindrical magnet rubber A formed by such a manufacturing method is magnetized, a magnet having a high magnetic force and a circumferentially small magnetic variation can be formed.
【0008】[0008]
【実施例】本発明の実施において、押し出し機によるゴ
ム生地は、混入した磁性粉(例えばフェライト)が押し
出し方向に整列され(断面上は対称となる)、これの接
合部の円周方向のフェライト配列の均一性は切断面が圧
縮成形の方向つまり軸方向に垂直な面に近いほどその配
列の不規則性が薄められるので、その切断面を傾斜に形
成して接合することが重要であり、圧縮方向に対し垂直
な傾斜角度に近い切断面が好ましいものとなる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the practice of the present invention, a rubber material produced by an extruder is arranged such that mixed magnetic powder (for example, ferrite) is aligned in the extrusion direction (the cross section is symmetrical), and the ferrite in the circumferential direction of the joint portion is joined. The uniformity of the arrangement is such that the closer the cut surface is to the direction of compression molding, that is, the surface perpendicular to the axial direction, the less the irregularity of the arrangement is, so it is important to form the cut surface at an angle and join it, A cut surface close to a tilt angle perpendicular to the compression direction is preferable.
【0009】このような磁性粉はNBRとか、H−NB
R(水素添加NBR)等のポリマーへ重量比70〜98
%程度に配合し、ゴム薬品と共に混合せしめて未加硫ゴ
ムを形成する。これを押し出し機を用いて押し出し成形
するものであり、形成されるゴム環1の紐の直径として
は、円筒形マグネットゴムAのゴム部厚さの3〜10倍
の太さに形成されるのが目安となる。具体例として、ゴ
ム部厚さ1mm、高さ8mmの製品に対して、4〜6m
mのひもの直径が目安となる。Such magnetic powders include NBR, H-NB
R (hydrogenated NBR) and other polymers in a weight ratio of 70 to 98
% And mixed with rubber chemicals to form an unvulcanized rubber. This is extruded using an extruder. The diameter of the string of the rubber ring 1 to be formed is 3 to 10 times the thickness of the rubber portion of the cylindrical magnet rubber A. Is a guide. As a specific example, for a product having a rubber part thickness of 1 mm and a height of 8 mm, 4 to 6 m
The diameter of the string of m is a guide.
【0010】ここで用いる磁性粉としては、安価で強磁
性を保持せしめることのできるフェライト粉末が最も適
するものであり、練り作業性あるいは押し出し作業性か
ら見ても取り扱いが容易であるので薦められる磁性材料
となっている。As the magnetic powder used here, ferrite powder which is inexpensive and can retain ferromagnetism is the most suitable, and is easy to handle in view of kneading workability or extrusion workability. Material.
【0011】また、ゴム生地からゴム環1へのリング形
状の接合形成においては、ゴム生地だけを単独でOリン
グ状に丸め形成することもできるが、図1、図2及び図
3に示されたように製品の補強を目的にカラー状の芯金
4が埋設配置される場合には、該芯金4を加熱して圧接
してゴム環1と芯金4を一体化せしめることが可能とな
り、この圧接方法ではその丸め形成が容易となるのは勿
論、保管・搬送から金型への投入までその作業性を飛躍
的に向上させる。In the formation of a ring-shaped joint from the rubber material to the rubber ring 1, the rubber material alone may be formed into an O-ring shape by itself, as shown in FIGS. 1, 2 and 3. As described above, when the metal core 4 is buried and arranged for the purpose of reinforcing the product, the rubber core 1 and the metal core 4 can be integrated by heating and pressing the metal core 4. In addition, this press-contact method not only facilitates the rounding, but also dramatically improves the workability from storage / transportation to loading into a mold.
【0012】[0012]
【発明の効果】本発明によると、磁性粉を混合した未加
硫ゴムを押し出し、その接続部面に傾斜を形成してゴム
環1を形成し、これを円筒形のスキマに一方向から流し
込むことにより磁性粉を平行に並ばせたもので、これは
ゴム材料中の磁性粉つまりフェライトの整った方向、配
列が磁力を強くせしめ、周上にバラツキがなく均一に分
布するものとなっている。その未加硫ゴムの充填率に対
する寸法設定においては、紐状の直径のみの調整で事足
りるので極めてシンプルである。また、未加硫ゴムの断
面形状が円型の紐状であるのでネジレ、倒れなどの載置
ミスによる影響が少なく、また接合部の加工、接合等が
簡単で取扱性に優れている。According to the present invention, the unvulcanized rubber mixed with the magnetic powder is extruded, and a slope is formed on the connecting surface to form a rubber ring 1, which is poured into a cylindrical gap from one direction. In this way, the magnetic powder is arranged in parallel, and the magnetic powder in the rubber material, that is, the ferrite is arranged in a uniform direction and arrangement enhances the magnetic force, and it is distributed uniformly without variation on the circumference . In setting the dimensions for the filling rate of the unvulcanized rubber, it is sufficient to adjust only the diameter of the string, which is extremely simple. In addition, since the cross-sectional shape of the unvulcanized rubber is a circular string shape, it is less affected by placement errors such as twisting and falling, and the processing and bonding of the bonding portion are simple and excellent in handling.
【図1】本発明の成形前の実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention before molding.
【図2】本発明の成形状態を示す断面図である。FIG. 2 is a sectional view showing a molding state of the present invention.
【図3】図2から型締めした状態を示す断面図である。FIG. 3 is a sectional view showing a state where the mold is clamped from FIG. 2;
【図4】円筒形マグネットゴムを示す斜視図である。FIG. 4 is a perspective view showing a cylindrical magnet rubber.
A 円筒形マグネットゴム 1 ゴム環 2a 下金型 21a キャビティ 22a 溝部 3a 上金型 32a 凸部 4 芯金 A Cylindrical magnet rubber 1 Rubber ring 2a Lower mold 21a Cavity 22a Groove 3a Upper mold 32a Convex part 4 Core
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) B29K 105:00 B29K 105:00 105:16 105:16 B29L 31:34 B29L 31:34 Fターム(参考) 4F202 AA45 AB13 AD03 AD18 AG08 AH33 CA09 CB01 CB12 CK01 CK15 CK41 CK52 CQ01 4F204 AA45 AB13 AD03 AD18 AG08 AH33 FA01 FB01 FB12 FF01 FF06 FF21 FG01 FG08 FH19 FN11 5E062 CC02 CE03 CE07 CG01 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) B29K 105: 00 B29K 105: 00 105: 16 105: 16 B29L 31:34 B29L 31:34 F term (Reference) 4F202 AA45 AB13 AD03 AD18 AG08 AH33 CA09 CB01 CB12 CK01 CK15 CK41 CK52 CQ01 4F204 AA45 AB13 AD03 AD18 AG08 AH33 FA01 FB01 FB12 FF01 FF06 FF21 FG01 FG08 FH19 FN11 5E062 CC01 CE03 CG07
Claims (3)
て、磁性粉を混合し紐状に押し出し形成されたゴム生地
を用意し、前記ゴム生地の切断両端面を傾斜部としその
両端面の傾斜部を接合して成形物の中心径とほぼ同形の
ゴム環を形成せしめ、下金型へ刻設したキャビティの入
口部に前記ゴム環の載置される溝部を設けると共に、該
溝部の両側部を外方に向かって開くテーパー形状とし、
前記テーパー形状の溝部に合わされる凸部を持つ上金型
と組み合わされ、この上・下金型間に前記ゴム環を投入
し圧縮加熱せしめて形成することを特徴とした円筒形マ
グネットゴムの成形方法。1. A method of molding a cylindrical magnet rubber, comprising preparing a rubber material extruded in a string shape by mixing magnetic powder, making both cut end surfaces of the rubber material inclined portions, and inclining the both end surfaces. The rubber parts are joined to form a rubber ring having substantially the same shape as the center diameter of the molded product. At the entrance of the cavity cut into the lower mold, a groove part for mounting the rubber ring is provided, and both side parts of the groove part are provided. With a tapered shape that opens outward,
Forming a cylindrical magnet rubber, which is combined with an upper mold having a convex portion to be fitted to the tapered groove portion, and the rubber ring is put between the upper and lower molds and compressed and heated to form. Method.
トゴムのゴム部厚さの3〜10倍の太さに形成すること
を特徴とする請求項1の円筒形マグネットゴムの成形方
法。2. The method according to claim 1, wherein the diameter of the rubber ring is 3 to 10 times the thickness of the rubber portion of the cylindrical magnet rubber.
は、円筒形マグネットゴムに埋設される芯金の表面に付
着せしめて環形成されることを特徴とする請求項1ない
し2の円筒形マグネットゴムの成形方法。3. A cylindrical ring according to claim 1, wherein said rubber ring for joining said rubber material is formed into a ring by adhering to a surface of a metal core embedded in a cylindrical magnet rubber. Method of molding magnet rubber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32352899A JP3564341B2 (en) | 1999-11-15 | 1999-11-15 | Molding method of cylindrical magnet rubber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32352899A JP3564341B2 (en) | 1999-11-15 | 1999-11-15 | Molding method of cylindrical magnet rubber |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2001138351A true JP2001138351A (en) | 2001-05-22 |
JP3564341B2 JP3564341B2 (en) | 2004-09-08 |
Family
ID=18155713
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Application Number | Title | Priority Date | Filing Date |
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JP32352899A Expired - Fee Related JP3564341B2 (en) | 1999-11-15 | 1999-11-15 | Molding method of cylindrical magnet rubber |
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JP (1) | JP3564341B2 (en) |
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-
1999
- 1999-11-15 JP JP32352899A patent/JP3564341B2/en not_active Expired - Fee Related
Cited By (11)
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US6689297B1 (en) * | 2000-02-22 | 2004-02-10 | Uchiyama Manufacturing Corp. | Method of manufacturing magnetic rubber ring |
EP1764537A1 (en) * | 2005-09-15 | 2007-03-21 | Denso Corporation | Solenoid drive apparatus |
CN100455863C (en) * | 2005-09-15 | 2009-01-28 | 株式会社电装 | Solenoid drive apparatus |
US7552908B2 (en) | 2005-09-15 | 2009-06-30 | Denso Corporation | Solenoid drive apparatus |
JP2009222469A (en) * | 2008-03-14 | 2009-10-01 | Bridgestone Corp | Conveyor belt and method of manufacturing the same |
CN106003558A (en) * | 2016-05-13 | 2016-10-12 | 郎溪亚博磁电科技有限公司 | Production technology of high-strength cracking-prevention variable speed induction signal components |
CN106003558B (en) * | 2016-05-13 | 2018-07-20 | 郎溪亚博磁电科技有限公司 | A kind of production technology of high intensity crack resistence speed change inductive signal component |
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KR101982808B1 (en) * | 2018-08-13 | 2019-09-03 | 에스티엠(주) | Encoder manufacturing apparatus and encoder manufacturing method |
CN117140821A (en) * | 2023-10-31 | 2023-12-01 | 北京中科三环高技术股份有限公司 | Annular magnetic sheet forming device and forming method |
CN117140821B (en) * | 2023-10-31 | 2024-02-23 | 北京中科三环高技术股份有限公司 | Annular magnetic sheet forming device and forming method |
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