JPH0845720A - Pellet and bond magnets - Google Patents
Pellet and bond magnetsInfo
- Publication number
- JPH0845720A JPH0845720A JP6183163A JP18316394A JPH0845720A JP H0845720 A JPH0845720 A JP H0845720A JP 6183163 A JP6183163 A JP 6183163A JP 18316394 A JP18316394 A JP 18316394A JP H0845720 A JPH0845720 A JP H0845720A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- weight
- pellets
- pellet
- liquid resin
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/083—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Hard Magnetic Materials (AREA)
Abstract
(57)【要約】
【目的】 本発明は、ペレットおよびボンド磁石に関
し、磁粉に固形樹脂および液状樹脂を所定割合で混練し
てペレットを作成し、ペレットを金型に充填して圧縮成
形・キュアしてボンド磁石を作成し、圧縮成形時に流動
性を持たせると共に金型にはりつかない量産性に優れた
ペレットを実現すると共に、このペレットを使用して圧
縮成形したときに、キュア強度大、高密度にして高磁気
特性化、および成形圧力伝達性良好にして寸法安定性向
上させたボンド磁石を作成することを目的とする。
【構成】 磁粉を（１００−Ｘ）重量％、固形樹脂をＸ
×（１００−Ｙ）÷１００重量％、および液状樹脂をＸ
×Ｙ÷１００重量％を混練した後、乾燥および解砕して
作成したペレット。
但し、０．５≦Ｘ≦１．５ ５≦Ｙ≦１０
(57) [Summary] [Object] The present invention relates to a pellet and a bonded magnet, wherein magnetic powder is kneaded with a solid resin and a liquid resin at a predetermined ratio to prepare a pellet, and the pellet is filled in a mold to perform compression molding / curing. In this way, a bond magnet is created to have fluidity during compression molding and to realize pellets with excellent mass productivity that do not stick to the mold, and when this pellet is compression molded, the cure strength is high, It is an object of the present invention to produce a bonded magnet having a high density and high magnetic characteristics, and a good molding pressure transferability to improve dimensional stability. [Composition] Magnetic powder (100-X)% by weight, solid resin X
X (100-Y) ÷ 100% by weight, and liquid resin X
Pellets prepared by kneading × Y ÷ 100% by weight, drying and crushing. However, 0.5 ≦ X ≦ 1.5 5 ≦ Y ≦ 10
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁粉に固形樹脂と液状
樹脂を混練したペレットおよびボンド磁石に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pellet and a bonded magnet in which magnetic powder is kneaded with a solid resin and a liquid resin.
【０００２】[0002]
【従来の技術】従来、Ｎｄ−Ｆｅ−Ｂボンド磁石は、磁
粉に熱硬化性の樹脂を混練・乾燥し粉砕して所定粒径の
ペレットを作成し、このペレットを金型に充填し圧縮成
形し、所望の形状のボンド磁石を製造している。2. Description of the Related Art Conventionally, in Nd-Fe-B bond magnets, thermosetting resin is mixed with magnetic powder, dried and crushed to prepare pellets having a predetermined particle size, and the pellets are filled in a mold and compression molded. Then, a bonded magnet having a desired shape is manufactured.
【０００３】[0003]
【発明が解決しようとする課題】この際、ボンド磁石の
高磁気特性化のために、成形体の高密度化が必要であ
り、そのために成形圧力を増したり、液状樹脂を使用す
るなどが考えられる。At this time, in order to improve the magnetic characteristics of the bonded magnet, it is necessary to increase the density of the molded body. For this reason, it is considered to increase the molding pressure or use a liquid resin. To be
【０００４】前者の成形圧力を増した場合、金型が壊れ
易くなってしまう問題がある。後者の液状樹脂を使用し
た場合、ペレットが金型に充填し難くなったり、充填で
きない事態が生じるという問題がある。この事態を避け
るために液状樹脂をカプセル化して磁粉と混合しペレッ
トの金型充填性を向上させている例もあるが、この場
合、成形体強度が弱くなってしまったり、成形体が金型
にはりつくなどの点が残るため、取り出し方法を工夫す
る必要や、成形サイクルが長くなってしまう問題があ
る。When the former molding pressure is increased, there is a problem that the mold is easily broken. When the latter liquid resin is used, there is a problem in that it becomes difficult or impossible to fill the pellets in the mold. In order to avoid this situation, there are some examples in which liquid resin is encapsulated and mixed with magnetic powder to improve the mold filling property of pellets, but in this case, the strength of the molded body becomes weak, or the molded body is Since there are still sticking points, it is necessary to devise a taking-out method and the molding cycle becomes long.
【０００５】本発明は、これらの問題を解決するため、
磁粉に固形樹脂および液状樹脂を所定割合で混練してペ
レットを作成し、このペレットを金型に充填して圧縮成
形・キュアしてボンド磁石を作成し、圧縮成形時に流動
性を持たせると共に金型にはりつかない量産性に優れた
ペレットを実現すると共に、このペレットを使用して圧
縮成形したときに、キュア強度大、高密度にして高磁気
特性化、および成形圧力伝達性良好にして寸法安定性を
向上させたボンド磁石を作成することを目的としてい
る。The present invention solves these problems.
Solid resin and liquid resin are kneaded with magnetic powder at a predetermined ratio to create pellets, which are filled in a mold and compression molded / cured to create bond magnets, which have fluidity during compression molding and gold. Achieves mass-producible pellets that do not cling to the mold, and when these pellets are used for compression molding, they have high cure strength, high density, high magnetic characteristics, and good molding pressure transmission characteristics. The purpose is to create a bonded magnet with improved stability.
【０００６】[0006]
【課題を解決するための手段】図１を参照して課題を解
決するための手段を説明する。図１において、秤量工程
１は、磁粉、固形樹脂、および液状樹脂を所定の割合に
秤量する工程である。[Means for Solving the Problems] Means for solving the problems will be described with reference to FIG. In FIG. 1, the weighing step 1 is a step of weighing the magnetic powder, the solid resin, and the liquid resin at a predetermined ratio.
【０００７】混練工程２は、秤量工程１で所定割合に秤
量した磁粉、固形樹脂、および液状樹脂を溶剤で希釈
し、良く混練する工程である。乾燥工程３は、混練した
混練物を乾燥する工程である。The kneading step 2 is a step of diluting the magnetic powder, the solid resin, and the liquid resin, which are weighed in a predetermined ratio in the weighing step 1, with a solvent and kneading well. The drying step 3 is a step of drying the kneaded product.
【０００８】解砕工程４は、乾燥工程３で乾燥した粒状
物を細かく解砕する工程である。ふるい分け工程５は、
解砕工程４で解砕した粒状物をふるいで所定粒径のペレ
ットにふるい分けする工程である。The crushing step 4 is a step of finely crushing the granular material dried in the drying step 3. The sieving process 5,
This is a step of sieving the granular material crushed in the crushing step 4 into pellets having a predetermined particle size.
【０００９】成形工程６は、ペレットを図示外の金型に
充填し、加圧成形する工程である。キュア工程７は、所
定の温度で樹脂を熱硬化させる工程である。The molding step 6 is a step of filling pellets in a mold (not shown) and pressure molding. The curing step 7 is a step of thermally curing the resin at a predetermined temperature.
【００１０】[0010]
【作用】本発明は、図１に示すように、秤量工程１で磁
粉を（１００−Ｘ）重量％、固形樹脂をＸ×（１００−
Ｙ）÷１００重量％、および液状樹脂をＸ×Ｙ÷１００
重量％を秤量し、混練工程２でこれら秤量した磁粉、固
形樹脂、および液状樹脂に溶媒で希釈して混練した後、
乾燥工程３で混練物を乾燥し、解砕工程４で混練物を解
砕し、ペレットを作成するようにしている。In the present invention, as shown in FIG. 1, in the weighing step 1, (100-X)% by weight of magnetic powder and XX (100-
Y) ÷ 100% by weight, and liquid resin X × Y ÷ 100
After the weight% is weighed and diluted in a solvent to the weighed magnetic powder, solid resin and liquid resin in the kneading step 2 and kneaded,
In the drying step 3, the kneaded material is dried, and in the crushing step 4, the kneaded material is crushed to form pellets.
【００１１】ここで、０．５≦Ｘ≦１．５、５≦Ｙ≦１
０である。この際、磁粉としてＮｄ−Ｆｅ−Ｂ急冷磁石
粉体を使用するようにしている。また、成形工程６で作
成したペレットを金型に充填して圧縮成形し、キュア工
程７で圧縮成形した成形体をキュア（所定温度で樹脂を
熱硬化）して高密度化したボンド磁石を作成する。Here, 0.5 ≦ X ≦ 1.5, 5 ≦ Y ≦ 1
0. At this time, Nd-Fe-B quenched magnet powder is used as the magnetic powder. Further, the pellets created in the molding step 6 are filled in a mold and compression-molded, and the molded body compression-molded in the curing step 7 is cured (thermosetting of resin at a predetermined temperature) to form a high-density bond magnet. To do.
【００１２】従って、磁粉に固形樹脂および液状樹脂を
所定割合で混練してペレットを作成し、このペレットを
金型に充填して圧縮成形・キュアしてボンド磁石を作成
することにより、圧縮成形時に流動性を持たせると共に
金型にはりつかない量産性に優れたペレットを実現する
ことが可能となると共に、このペレットを使用して圧縮
成形したときに、キュア強度大、高密度にして高磁気特
性化、および成形圧力伝達性良好にして寸法安定性向上
させたボンド磁石を作成することが可能となる。Therefore, the magnetic powder is kneaded with the solid resin and the liquid resin at a predetermined ratio to form pellets, and the pellets are filled in a mold and compression-molded and cured to form bond magnets. It becomes possible to realize pellets that have fluidity and that do not cling to the mold and are excellent in mass productivity. Also, when these pellets are used for compression molding, they have high cure strength, high density, and high magnetic properties. It becomes possible to produce a bonded magnet with improved dimensional stability by better characterization and molding pressure transmission.
【００１３】[0013]
【実施例】次に、図１から図６を用いて本発明の実施例
の構成および動作を順次詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the construction and operation of an embodiment of the present invention will be described in detail with reference to FIGS.
【００１４】図１は、本発明の１実施例説明図を示す。
図１において、Ｓ１は、秤量する。これは、秤量工程１
によって行い、右側に記載したように、 の重量％の割合で秤量する。分かり易く説明すると、 磁粉：樹脂＝９８．５〜９９．５：０．５〜１．５ の範囲内とし、この樹脂は、 固形樹脂：液状樹脂＝９０〜９５：５〜１０ の範囲内とする。即ちペレットのうち樹脂の割合が０．
５〜１．５重量％の範囲であり、かつ樹脂のうち液状樹
脂の割合が５〜１０重量％の範囲内とする。FIG. 1 shows an explanatory view of one embodiment of the present invention.
In FIG. 1, S1 is weighed. This is the weighing step 1
Done as described on the right Is weighed at a weight percentage of. To explain in an easy-to-understand manner, magnetic powder: resin = 98.5 to 99.5: 0.5 to 1.5, and this resin is solid resin: liquid resin = 90 to 95: 5 to 10. To do. That is, the ratio of resin in the pellets is 0.
It is in the range of 5 to 1.5% by weight, and the proportion of the liquid resin in the resin is in the range of 5 to 10% by weight.
【００１５】Ｓ２は、混練する。これは、混練工程２に
よって行い、Ｓ１で秤量した磁粉、固形樹脂、および液
状樹脂に、当該固形樹脂と液状樹脂の両者を良く溶かす
溶剤（例えばトルエンなど）で希釈し、よく混練する。In S2, kneading is performed. This is performed in the kneading step 2, and the magnetic powder, solid resin, and liquid resin weighed in S1 are diluted with a solvent (for example, toluene) that dissolves both the solid resin and the liquid resin well, and kneaded well.
【００１６】Ｓ３は、乾燥する。これは、乾燥工程３に
よって行い、Ｓ２で良く混練した混練物を乾燥し、溶剤
を蒸発させる。Ｓ４は、解砕する。これは、解砕工程４
によって行い、Ｓ３で良く乾燥した粒状物を解砕して粉
末にする。S3 is dried. This is performed in the drying step 3, and the kneaded material well kneaded in S2 is dried to evaporate the solvent. S4 disintegrates. This is the crushing process 4
And the well dried granules are crushed into powder in S3.
【００１７】Ｓ５は、ふるい分けする。これは、ふるい
分け工程５によって行い、Ｓ４で解砕した粉末を所定の
枡目を持つふるいでふるい分けを行い、所定粒径のペレ
ットとする。At S5, screening is performed. This is performed in the sieving step 5, and the powder crushed in S4 is sieved with a sieve having predetermined meshes to obtain pellets having a predetermined particle size.
【００１８】Ｓ６は、成形する。これは、成形工程６に
よって行い、Ｓ５でふるい分けして生成したペレットを
金型に充填し加圧成形して成形体を生成する。Ｓ７は、
キュアする。これは、キュア工程７によって行い、Ｓ６
で成形した成形体を例えば不活性雰囲気中で所定の温度
の熱硬化をおこない、ボント磁石にする。そして、着磁
を行い製品となる。In step S6, molding is performed. This is performed in the molding step 6, and the pellets generated by sieving in S5 are filled in a mold and pressure-molded to generate a molded body. S7 is
Cure. This is performed by the curing step 7, and S6
The molded body molded in step 1 is heat-cured at a predetermined temperature in, for example, an inert atmosphere to form a bond magnet. Then, it is magnetized and becomes a product.
【００１９】図２は、本発明の実験結果例（その１）を
示す。これは、欄の下段に記載したように、 ・磁粉：Ｎｄ−Ｆｅ−Ｂ急冷磁石粉体 ・樹脂：総樹脂量１．５重量％ 固形樹脂：液状樹脂＝９０：１０の重量比率で混合 ・成形体：φ１８．１×φ１６×４．５のリング体（単
位はｍｍ） ・１００ケ連続成形し、その中から１０ケ抽出して評価 ・カッコ内の数字は、従来手法を１００として場合の相
対値 ・外径寸法差：３次元的（高さ方向）に外径を順次測定
して算出 ・空孔減少率：従来手法の成形体内の空孔体積を基準と
した場合の減少比率（計算値：総樹脂量１．５重量％の
理論密度は６．９６ｇ／ｃｍ3とした） としたときのものである。FIG. 2 shows an example (1) of the experimental result of the present invention. This is, as described in the lower part of the column, magnetic powder: Nd-Fe-B quenched magnet powder, resin: 1.5% by weight of total resin, solid resin: liquid resin, mixed at a weight ratio of 90:10. Formed body: φ18.1 × φ16 × 4.5 ring body (unit is mm) ・ 100 pieces are continuously formed, and 10 pieces are extracted from them, and evaluated ・ Numbers in parentheses are based on the conventional method of 100 Relative value ・ Outer diameter dimension difference: Calculated by sequentially measuring the outer diameter three-dimensionally (in the height direction) ・ Porosity reduction rate: Reduction rate based on the volume of pores in the molded body of the conventional method (calculation Value: The total resin amount was 1.5% by weight, and the theoretical density was 6.96 g / cm 3 ).
【００２０】表中の従来（固形樹脂のみを使用した場
合）と、本発明（固形樹脂＋液状樹脂を使用した場合）
とは、図示のように、 密度が（６．２８／６．０５）×１００＝１０４％
となり、４％の密度が大きくなっている。この密度は、
従来でも密度を高めるように工夫が施されている状態
で、更に高密度化したものである。この点は、総樹脂量
１．５重量％とすると理論密度は６．９６ｇ／ｃｍ2と
求まり、空孔の減少率で計算すると、欄中に記載したよ
うに、従来に比し、本発明は２５．２％も減少し、固形
樹脂に液状樹脂を適量混練したことにより、圧縮成形時
に成形圧力伝達性が良くなり空孔が大幅に減少し、結果
として磁粉を高密度に成形して緻密化できたこととな
る。Conventional (when only solid resin is used) and the present invention (when solid resin and liquid resin are used) in the table
As shown in the figure, the density is (6.28 / 6.05) × 100 = 104%
Therefore, the density of 4% is increased. This density is
It has been further densified in the state where the conventional device has been devised to increase the density. This point is obtained when the total amount of the resin is 1.5% by weight, and the theoretical density is found to be 6.96 g / cm 2, and when calculated by the reduction rate of pores, as shown in the column, the present invention has a 25.2% decreased, and by mixing an appropriate amount of liquid resin with solid resin, molding pressure transferability was improved during compression molding, and voids were significantly reduced, resulting in high density molding of magnetic powder and compaction. It has become possible.
【００２１】 未キュア強度（ｇｆ）が、従来の２９
０から本発明の４６０となり、（４６０／２９０）×１
００＝１５９％となり、５９％の強度が向上した。これ
は、固形樹脂に適度の液状樹脂を混練したため、樹脂が
軟らかくなり、未キュア強度が向上したものである。未
キュア強度が向上したことにより、成形した成形体の取
り扱いが容易となる。The uncured strength (gf) is 29
From 0 to 460 of the present invention, (460/290) × 1
00 = 159%, and the strength was improved by 59%. This is because the solid resin was kneaded with an appropriate amount of liquid resin, so that the resin became soft and the uncured strength was improved. The improved uncured strength facilitates handling of the molded body.
【００２２】 キュア後強度が従来の２．２から本発
明の３．０となり、１３６％で強度が増したこととな
る。 外径寸法誤差が従来の２２から本発明の９となり、
成形後の外径寸法の差が小さくなって寸法安定性が大幅
に向上した。これは、固形樹脂に液状樹脂を混練したペ
レットとしたため、成形時に成形圧の伝達性が改善さ
れ、外径寸法の差が場所によって異なる割合が非常に小
さくなり、結果として寸法安定性が大幅に向上したもの
である。The post-curing strength was changed from 2.2 in the past to 3.0 in the present invention, and the strength was increased to 136%. Outer diameter dimension error is changed from the conventional 22 to 9 of the present invention,
The difference in outer diameter dimension after molding was reduced and dimensional stability was greatly improved. This is because pellets made by kneading a liquid resin with a solid resin are used to improve the transferability of the molding pressure during molding, and the difference in the difference in outer diameter between locations is extremely small, resulting in a large dimensional stability. It is an improved one.
【００２３】図３は、本発明の総樹脂量の説明図を示
す。ここで、欄中に記載したように、 総樹脂量が０．５重量％未満の場合：強度不足、成
形性劣化（キレツ、ワレ等）が顕著になる。FIG. 3 is an explanatory view of the total resin amount of the present invention. Here, as described in the column, when the total amount of resin is less than 0.5% by weight: insufficient strength and deterioration of moldability (breaks, cracks, etc.) become remarkable.
【００２４】 ０．５〜１．５重量％の範囲の場合：
強度、成形性、磁力の面で特に問題ない為、この範囲に
限定される（図２の実験結果参照）。In the range of 0.5 to 1.5% by weight:
Since there are no particular problems in terms of strength, moldability, and magnetic force, the range is limited (see experimental results in FIG. 2).
【００２５】 １．５重量％より多い場合：樹脂過剰
により磁力が低下する。 図４は、本発明の実験結果例（その２）を示す。これ
は、図２の実験結果の液状樹脂の比率（１０重量％）の
みを０、４、５、１０、１５の５種類に変化させたとき
の高さ、密度、空孔減少率、特記事項を測定およびその
ときの状態を記載したものである。When it is more than 1.5% by weight: The magnetic force is reduced due to excess resin. FIG. 4 shows an example (2) of the experimental result of the present invention. This is the height, density, vacancy reduction rate, and special notes when only the liquid resin ratio (10% by weight) in the experimental result of FIG. 2 is changed to 0, 4, 5, 10, and 15. Is described and the state at that time is described.
【００２６】 液状樹脂比率 高さ 密度 空孔減少 特記事項 （重量％） σn-1(mm) ｇ／ｃｍ3 率％ ０ ０．０２ ６．０５ − 比較用（従来手法） ４ ０．０２ ６．０７ 2.3 高密度化の効果は発現しない ５ ０．０２ ６．２６ 22.9 ペレット流動特性を損なうこと なく、高密度化が可能 １０ ０．０２ ６．２８ 25.2 ペレット流動特性を損なうこと なく、高密度化が可能 １５ ０．２１ ６．３０ 27.5 ペレット流動特性劣化、金型へ のはりつき発生 上述したように、 樹脂中の液状樹脂の重量％が０〜４では、空孔減少
率（％）が殆ど現れず、高密度化の効果が発現しない。Liquid resin ratio Height Density Pore reduction Remarks (weight%) σ n-1 (mm) g / cm 3 rate% 0 0.02 6.05-Comparison (conventional method) 4 0.02 6 0.07 No effect of densification 5 0.02 6.26 22.9 High density without loss of pellet flow characteristics 10 0.02 6.28 25.2 High density without loss of pellet flow characteristics 15 0.21 6.30 27.5 Deterioration of pellet flow characteristics and sticking to the mold As mentioned above, when the weight% of the liquid resin in the resin is 0 to 4, the void reduction rate (%) is almost zero. It does not appear, and the effect of high density is not exhibited.
【００２７】 樹脂中の液状樹脂の重量％が５〜１０
では、空孔減少率（％）が２２．９〜２５．２だけ小さ
くなり、明らかにペレットの流動特性を損なうことな
く、高密度化できた。The weight percentage of the liquid resin in the resin is 5 to 10
In, the vacancy reduction rate (%) was reduced by 22.9 to 25.2, and the density could be increased without obviously impairing the flow characteristics of the pellet.
【００２８】 樹脂中の液状樹脂の重量％が１５で
は、空孔減少率（％）が２７．５だけ小さくなり、高密
度化は達成されるが、しかしペレットの流動特性が劣化
し、金型へのはりつきが発生した（液状樹脂の特徴が現
れ、金型へのはりつきが発生するようになってしまっ
た）。When the weight% of the liquid resin in the resin is 15, the void reduction rate (%) is reduced by 27.5 and the densification is achieved, but the flow characteristics of the pellets are deteriorated and the mold is Adhesion to the mold occurred (the characteristic of the liquid resin appeared, and the adhesion to the mold started to occur).
【００２９】従って、固形樹脂中に５〜１０重量％の液
状樹脂を混練したときのペレットが、圧縮成形したとき
に高密度化が得られ、しかも金型へのはりつきが発生し
ない状態を実現できた。ここで、液状樹脂は、１種に限
る必要はなく、２種以上であっても、当該液状樹脂の全
体の割合が５〜１０重量％の範囲内であればよい結果が
得られる。Therefore, the pellets obtained by kneading 5 to 10% by weight of the liquid resin in the solid resin can be densified at the time of compression molding, and the sticking to the mold does not occur. It was Here, the liquid resin does not have to be limited to one type, and even if two or more types are used, good results can be obtained as long as the total proportion of the liquid resin is within the range of 5 to 10% by weight.
【００３０】尚、本実施例では、固形樹脂として、常温
で固形のエポキシ樹脂を溶剤で希釈したもの（例えば菱
電化成株式会社製のＶ−１４０−５０）を使用した。ま
た、液状樹脂として、常温で液状のエポキシ樹脂（例え
ば油化シェルエポキシ株式会社製のエピコート（商品
名）８１９）を使用した。これら２者に限ることなく、
常温で固形および液状であって、両者が溶剤に溶解する
ものであればよい。In this example, a solid resin obtained by diluting a solid epoxy resin with a solvent at room temperature (for example, V-140-50 manufactured by Ryoden Kasei Co., Ltd.) was used. As the liquid resin, an epoxy resin that is liquid at room temperature (for example, Epicoat (trade name) 819 manufactured by Yuka Shell Epoxy Co., Ltd.) was used. Not limited to these two,
It may be a solid or a liquid at room temperature, and both can be dissolved in a solvent.
【００３１】図５は、本発明の固形樹脂／液状樹脂量の
説明図を示す。ここで、欄中に記載したように、 液状樹脂の比率が５重量％未満の場合：高密度化の
効果は発現しない。FIG. 5 is an explanatory view of the solid resin / liquid resin amount of the present invention. Here, as described in the column, when the ratio of the liquid resin is less than 5% by weight: the effect of increasing the density is not exhibited.
【００３２】 液状樹脂の比率が５〜１０重量％の範
囲の場合：高密度化の効果を有し、かつペレット流動特
性（量産性）も良好である 液状樹脂の比率が１０重量％より多い場合：高密度
化の効果はあるが、ペレット流動特性（量産性）が劣化
する。When the ratio of the liquid resin is in the range of 5 to 10% by weight: It has the effect of increasing the density and also has good pellet flow characteristics (mass productivity). When the ratio of the liquid resin is more than 10% by weight. : Pellets flow characteristics (mass productivity) are deteriorated, although there is an effect of high density.
【００３３】図６は、本発明の高密度化の説明図を示
す。図６の（ａ）は、ペレットを示す。このペレットの
状態では、磁粉の外周を樹脂で覆っている図６の（ｂ）
は、従来の圧縮成形後の製品（ボンド磁石）を示す。こ
の従来の場合には、固形樹脂を磁粉の外周に覆ったペレ
ットを、金型に充填して圧縮成形しているため、流動性
や圧力伝達性が本発明に比して悪く、図示のように空孔
の割合が大きく、結果として密度が小さくなり、高密度
化した製品（ボンド磁石）を成形できない。FIG. 6 is an explanatory view of the high density of the present invention. FIG. 6A shows a pellet. In the state of this pellet, the outer periphery of the magnetic powder is covered with resin (b) in FIG.
Shows a conventional product (bonded magnet) after compression molding. In this conventional case, since the pellets in which the solid resin is coated on the outer periphery of the magnetic powder are filled in the mold and compression-molded, the fluidity and the pressure transmissibility are worse than those of the present invention, and as shown in the figure. In addition, the ratio of voids is large, and as a result, the density is low, and it is not possible to form a high-density product (bond magnet).
【００３４】図６の（ｃ）は、本発明の圧縮成形後の製
品（ボンド磁石）を示す。この本発明の場合には、固形
樹脂に液状樹脂を５〜１０重量％混ぜて磁粉の外周に覆
ったペレットを、金型に充填して圧縮成形しているた
め、流動性や圧力伝達性が従来に比して非常に良好で、
金型にはりつくことなく、図示のように空孔の割合が小
さく、結果として密度が大きくなり、高密度化した製品
（ボンド磁石）を成形できる。FIG. 6C shows the product (bonded magnet) after compression molding of the present invention. In the case of the present invention, since the solid resin is mixed with the liquid resin in an amount of 5 to 10% by weight and the pellets covered with the outer periphery of the magnetic powder are filled in the mold and compression-molded, fluidity and pressure transferability are improved. Very good compared to the past,
As shown in the figure, the ratio of voids is small without sticking to the mold, resulting in a high density, and a high-density product (bonded magnet) can be molded.
【００３５】[0035]
【発明の効果】以上説明したように、本発明によれば、
磁粉に固形樹脂および液状樹脂を所定割合で混練してペ
レットを作成し、このペレットを金型に充填して圧縮成
形・キュアしてボンド磁石を作成する構成を採用してい
るため、圧縮成形時に流動性を持たせると共に金型には
りつかない量産性に優れたペレットを作成できると共
に、このペレットを使用して圧縮成形したときに、キュ
ア強度大、高密度にして高磁気特性化、および成形圧力
伝達性良好にして寸法安定性向上させたボンド磁石を作
成できた。As described above, according to the present invention,
Solid resin and liquid resin are kneaded with magnetic powder at a predetermined ratio to make pellets, and the pellets are filled in a mold and compression-molded and cured to create bond magnets. It is possible to create pellets that are fluid and have excellent mass productivity that do not cling to the mold, and when these pellets are used for compression molding, they have high cure strength, high density, high magnetic characteristics, and molding. A bonded magnet having good pressure transferability and improved dimensional stability could be produced.
【図１】本発明の１実施例説明図である。FIG. 1 is an explanatory diagram of an embodiment of the present invention.
【図２】本発明の実験結果例（その１）である。FIG. 2 is an example (1) of the experimental result of the present invention.
【図３】本発明の総樹脂量の説明図である。FIG. 3 is an explanatory diagram of a total resin amount of the present invention.
【図４】本発明の実験結果例（その２）である。FIG. 4 is an example (2) of the experimental result of the present invention.
【図５】本発明の固形樹脂／液状樹脂量の説明図であ
る。FIG. 5 is an explanatory view of the amount of solid resin / liquid resin of the present invention.
【図６】本発明の高密度化の説明図である。FIG. 6 is an explanatory diagram of high density of the present invention.
１：秤量工程 ２：混練工程 ３：乾燥工程 ４：解砕工程 ５：ふるい分け工程 ６：成形工程 ７：キュア工程 1: Weighing process 2: Kneading process 3: Drying process 4: Crushing process 5: Sieving process 6: Molding process 7: Cure process
Claims (4)
Ｘ×（１００−Ｙ）÷１００重量％、および液状樹脂を
Ｘ×Ｙ÷１００重量％を混練した後、乾燥および解砕し
て作成したペレット。 但し、０．５≦Ｘ≦１．５ ５≦Ｙ≦１０1. A magnetic powder of (100-X)% by weight, a solid resin of X × (100-Y) ÷ 100% by weight, and a liquid resin of X × Y ÷ 100% by weight, which are then dried and crushed. Pellets created by. However, 0.5 ≦ X ≦ 1.5 5 ≦ Y ≦ 10
溶解する溶剤で希釈し、上記磁粉と混練し、乾燥および
解砕して作成することを特徴とする請求項１に記載のペ
レット。2. The pellet according to claim 1, which is prepared by diluting with a solvent in which both the solid resin and the liquid resin are dissolved, kneading with the magnetic powder, drying and crushing.
したことを特徴とする請求項１あるいは請求項２に記載
のペレット。3. The pellet according to claim 1 or 2, wherein the magnetic powder is Nd-Fe-B quenched magnet powder.
縮成形およびキュアして作成した高密度化したボンド磁
石。4. A densified bond magnet produced by compressing and molding the pellets thus prepared in a mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6183163A JPH0845720A (en) | 1994-08-04 | 1994-08-04 | Pellet and bond magnets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6183163A JPH0845720A (en) | 1994-08-04 | 1994-08-04 | Pellet and bond magnets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0845720A true JPH0845720A (en) | 1996-02-16 |
Family
ID=16130898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6183163A Pending JPH0845720A (en) | 1994-08-04 | 1994-08-04 | Pellet and bond magnets |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0845720A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997035331A1 (en) * | 1996-03-18 | 1997-09-25 | Seiko Epson Corporation | Process for producing rare earth bond magnet, composition for rare earth bond magnet, and rare earth bond magnet |
| JPH11312603A (en) * | 1998-04-30 | 1999-11-09 | Seiko Epson Corp | Rare earth bonded magnet, composition for rare earth bonded magnet, and method for manufacturing rare earth bonded magnet |
-
1994
- 1994-08-04 JP JP6183163A patent/JPH0845720A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997035331A1 (en) * | 1996-03-18 | 1997-09-25 | Seiko Epson Corporation | Process for producing rare earth bond magnet, composition for rare earth bond magnet, and rare earth bond magnet |
| US6001272A (en) * | 1996-03-18 | 1999-12-14 | Seiko Epson Corporation | Method for producing rare earth bond magnet, composition for rare earth bond magnet, and rare earth bond magnet |
| JPH11312603A (en) * | 1998-04-30 | 1999-11-09 | Seiko Epson Corp | Rare earth bonded magnet, composition for rare earth bonded magnet, and method for manufacturing rare earth bonded magnet |
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