JP2013094811A - Manufacturing method and manufacturing apparatus of magnet ribbon - Google Patents
Manufacturing method and manufacturing apparatus of magnet ribbon Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 79
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims description 16
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 5
- 238000007712 rapid solidification Methods 0.000 abstract description 13
- 229910045601 alloy Inorganic materials 0.000 abstract description 12
- 239000000956 alloy Substances 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 8
- 239000013078 crystal Substances 0.000 description 6
- 230000005347 demagnetization Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000002490 spark plasma sintering Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 229910001004 magnetic alloy Inorganic materials 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
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Abstract
Description
本発明は、急冷凝固による磁石薄帯の製造方法および製造装置に関する。 The present invention relates to a method and apparatus for manufacturing a magnet ribbon by rapid solidification.
ネオジム磁石（Ｎｄ２Ｆｅ１４Ｂ）で代表される希土類磁石は、磁束密度が高く極めて強力な永久磁石として種々の用途に用いられている。優れた磁気特性を得るために、ナノサイズの結晶粒または非晶質から成る微細組織を安定して確保する必要がある。そのため、希土類磁石の組成を有する合金溶湯を単ロール法、双ロール法等により急冷凝固させて薄帯（急冷リボン）を形成する方法が行なわれている。 Rare earth magnets typified by neodymium magnets (Nd 2 Fe 14 B) are used in various applications as permanent magnets with high magnetic flux density and extremely high strength. In order to obtain excellent magnetic properties, it is necessary to stably secure a microstructure composed of nano-sized crystal grains or amorphous. Therefore, a method of forming a ribbon (quenched ribbon) by rapidly solidifying a molten alloy having a composition of a rare earth magnet by a single roll method, a twin roll method or the like is performed.
例えば特許文献１には、上記のような急冷凝固により永久磁石を製造する方法が提案されている。 For example, Patent Document 1 proposes a method of manufacturing a permanent magnet by rapid solidification as described above.
しかし、合金溶湯を急冷凝固過程においては、一定した冷却速度を安定して得ることが困難なため、望ましいナノ結晶粒組織または非晶質組織を安定して得ることができず、両者の混在組織となったり、粗大な結晶粒組織が生成したり、これらの３種類の混在組織が生成してしまうため、優れた磁気特性を安定して確保することができないという問題があった。 However, in the rapid solidification process of the molten alloy, it is difficult to stably obtain a constant cooling rate, so it is impossible to stably obtain a desired nanocrystalline structure or amorphous structure. Or a coarse crystal grain structure is generated, or these three kinds of mixed structures are generated, and thus there is a problem that excellent magnetic properties cannot be secured stably.
本発明は、急冷凝固により磁石合金の薄帯を製造する際に、望ましくない冷却速度で生成した薄帯の混在を防止することにより、均一な微細組織とそれによる優れた磁気特性を達成することができる磁石薄帯を製造する方法および装置を提供することを目的とする。 The present invention achieves a uniform microstructure and excellent magnetic properties by preventing the mixing of ribbons generated at an undesirable cooling rate when producing ribbons of magnet alloys by rapid solidification. It is an object of the present invention to provide a method and apparatus for manufacturing a magnet ribbon that can be used.
上記の目的を達成するために、本発明によれば、磁石合金の溶湯を冷却ロールの表面に吐出して急冷凝固する磁石薄帯の製造方法において、
上記急冷凝固する溶湯の冷却速度を連続的に測定し、所定の凝固組織が生成する範囲内の冷却速度で生成した薄帯を選択的に回収することを特徴とする磁石薄帯の製造方法が提供される。
In order to achieve the above object, according to the present invention, in a method for producing a magnet ribbon that rapidly solidifies by discharging a molten metal alloy onto the surface of a cooling roll,
A method for producing a magnet ribbon characterized by continuously measuring the cooling rate of the rapidly solidified molten metal and selectively recovering the ribbon generated at a cooling rate within a range where a predetermined solidified structure is generated. Provided.
上記の目的を達成するために、本発明によれば、磁石合金の溶湯を冷却ロールの表面に吐出して急冷凝固する磁石薄帯の製造装置において、
上記急冷凝固する溶湯の冷却速度を連続的に測定する冷却速度測定手段と、所定の凝固組織が生成する範囲内の冷却速度で生成した薄帯を選択的に回収する回収手段とを有することを特徴とする磁石薄帯の製造装置も提供される。
In order to achieve the above object, according to the present invention, in a magnet ribbon manufacturing apparatus that rapidly cools and solidifies by discharging a molten metal alloy onto the surface of a cooling roll,
A cooling rate measuring means for continuously measuring the cooling rate of the rapidly solidified molten metal, and a recovery means for selectively recovering the ribbon generated at a cooling rate within a range where a predetermined solidified structure is generated. An apparatus for producing the featured magnet strip is also provided.
本発明によれば、望ましい凝固組織が生成する範囲内の冷却速度で生成した薄帯を選択的に回収するので、望ましくない冷却速度で生成した薄帯の混在を防止することができ、均一な微細組織とそれによる優れた磁気特性を達成することができる。 According to the present invention, since the ribbons generated at a cooling rate within a range in which a desired solidified structure is generated is selectively recovered, mixing of ribbons generated at an undesirable cooling rate can be prevented, and uniform Fine structure and excellent magnetic properties can be achieved.
図１に、磁石合金の薄帯を製造するための冷却ロールによる急冷凝固手段を示す。 FIG. 1 shows rapid solidification means using a cooling roll for producing a magnetic alloy ribbon.
冷却ロールＲは回転軸Ｘの周りをＶ方向に回転する。磁石合金の溶湯ＭはノズルＮから冷却ロールＲの表面Ｓに吐出されて急冷され、凝固して薄帯（急冷リボン）ＢとなってＤ方向に生成する。 The cooling roll R rotates around the rotation axis X in the V direction. The melt M of the magnet alloy is discharged from the nozzle N onto the surface S of the cooling roll R, rapidly cooled, solidified, and formed into a ribbon (quenched ribbon) B in the D direction.
冷却ロールＲの表面Ｓで急冷凝固により生成した合金薄帯Ｂは、冷却速度の変動に起因して組織が種々に変化している。すなわち、冷却速度が低速度から高速度に変化するの伴って、粗大結晶粒組織→微細結晶粒組織→非晶質組織と変化し、更にそれぞれの中間の冷却速度ではそれぞれ粗大結晶粒／微細結晶粒の混在組織あるいは微細結晶粒／非晶質の混在組織が生成する。一般に、良好な磁気特性を確保するには微細結晶粒組織または非晶質組織であることが必要である。非晶質組織は、後に熱処理で結晶化させて微細結晶粒組織に改質して用いる。従来は、このように冷却速度の変動に応じて種々の組織が生成した薄帯が混在した状態であり、良好な磁気特性を安定して得られないという問題があった。 The alloy ribbon B formed by rapid solidification on the surface S of the cooling roll R has various structures that change due to fluctuations in the cooling rate. That is, as the cooling rate changes from a low rate to a high rate, the coarse grain structure → fine grain structure → amorphous structure changes, and at each intermediate cooling rate, the coarse grain / fine crystal respectively changes. A mixed grain structure or a mixed structure of fine crystal grains / amorphous is formed. In general, a fine crystal grain structure or an amorphous structure is required to ensure good magnetic properties. The amorphous structure is used after being crystallized by heat treatment and modified to a fine grain structure. Conventionally, the ribbons formed by various structures according to the fluctuation of the cooling rate are mixed, and there is a problem that good magnetic properties cannot be stably obtained.
上記従来の問題を解消するための本発明の特徴を、図２を参照して説明する。 The features of the present invention for solving the above-described conventional problems will be described with reference to FIG.
図２（１）に、本発明により磁石合金の急冷凝固薄帯を製造する装置の全体を示す。図１に示した冷却ロールＲで急冷凝固により生成した薄帯Ｂは、ロール回転周速ｖで左方に飛び出し、片状になって左端の回収機構Ａ内に進入し、案内スリーブ１３０内を落下して、回収容器１００内へ回収される。 FIG. 2 (1) shows the entire apparatus for producing a rapidly solidified ribbon of magnet alloy according to the present invention. The ribbon B generated by rapid solidification with the cooling roll R shown in FIG. 1 jumps out to the left at the roll rotational peripheral speed v, enters into the collection mechanism A at the left end in a piece, and passes through the guide sleeve 130. It falls and is collected in the collection container 100.
図２（２）の（Ａ）および（Ｂ）に示すように、回収容器１００は、２つの回収槽１１０と回収槽１２０に分けられている。例えば、適正な冷却速度で生成した薄帯Ｂは回収槽１１０へ、不適正な冷却速度で生成した薄帯Ｂは回収槽１２０へと分別回収される。２つの回収槽への振り分けは、（Ａ）に示すように振り分け板１４０が左右に旋回することにより、落下する薄帯Ｂを振り分けるようにしても良いし、（Ｂ）に示すように回収容器１００を左右に移動させて薄帯Ｂを振り分けるようにしても良い。この移動は、図示したように平行移動であってもよいし、回転移動（図示せず）であってもよい。 As shown in (A) and (B) of FIG. 2 (2), the recovery container 100 is divided into two recovery tanks 110 and a recovery tank 120. For example, the ribbon B generated at an appropriate cooling rate is collected separately into the recovery tank 110, and the ribbon B generated at an inappropriate cooling rate is collected separately into the recovery tank 120. The distribution to the two recovery tanks may be performed by distributing the falling ribbon B by turning the distribution plate 140 left and right as shown in (A), or as shown in (B). 100 may be moved to the left and right to distribute the ribbon B. This movement may be a parallel movement as shown, or may be a rotational movement (not shown).
また、説明を簡潔にするために、回収容器１００を２つの回収槽１１０と１２０に分けた例を述べたが、必要ならば３つ以上の回収槽に分けることもできる。この場合、多数個の回収槽を円形に組み合わせて回転移動させ、冷却速度の区分に応じて振り分けるようにすることができる。 In addition, for the sake of simplicity, an example in which the collection container 100 is divided into two collection tanks 110 and 120 has been described. However, if necessary, the collection container 100 may be divided into three or more collection tanks. In this case, a large number of recovery tanks can be combined in a circle and rotated to be distributed according to the classification of the cooling rate.
このように、適正な冷却速度で生成し望ましい微細組織から成る薄帯Ｂのみを磁石の素材として用いることにより、優れた磁気特性を安定して確保できる。 As described above, by using only the thin ribbon B that is generated at an appropriate cooling rate and has a desirable fine structure as the material of the magnet, excellent magnetic characteristics can be stably secured.
図３に、本発明の製造方法の基本的なフローチャートを示す。 FIG. 3 shows a basic flowchart of the manufacturing method of the present invention.
図３（１）は、冷却速度データのフィードバック制御する場合のフローチャートであり、図３（２）は、フィードバック制御しない場合のフローチャートである。冷却速度のフィードバック制御は、制御パラメータとして溶湯温度、冷却ロール表面温度、冷却ロール周速度を用いて行なうことができる。 FIG. 3 (1) is a flowchart when the feedback control of the cooling rate data is performed, and FIG. 3 (2) is a flowchart when the feedback control is not performed. The feedback control of the cooling rate can be performed using the molten metal temperature, the cooling roll surface temperature, and the cooling roll peripheral speed as control parameters.
以下に、実施例により本発明を更に詳細に説明する。 Hereinafter, the present invention will be described in more detail with reference to examples.
〔実施例１〕
組成がＮｄ１４．７Ｆｅ７９．０３Ｂ５．６７Ｇａ０．３Ｃｕ０．１Ａｌ０．２のネオジム磁石合金をアーク溶解炉にて溶製し、図２に示した製造装置にて合金薄帯（急冷リボン）を作製した。表１に作製条件を示す。
[Example 1]
A neodymium magnet alloy having a composition of Nd 14.7 Fe 79.03 B 5.67 Ga 0.3 Cu 0.1 Al 0.2 is melted in an arc melting furnace, and the alloy is produced using the production apparatus shown in FIG. A ribbon (quenched ribbon) was produced. Table 1 shows the manufacturing conditions.
図４に示すように、赤外カメラＫ（ＮＥＣアビオ製：ＴＳ９２３０Ｈ−Ａ０１）にて、凝固前後の溶湯温度を測定し、吐出中の急冷速度を評価した。 As shown in FIG. 4, the melt temperature before and after solidification was measured with an infrared camera K (manufactured by NEC Avio: TS9230H-A01), and the quenching rate during discharge was evaluated.
すなわち図５に示すように、赤外カメラＫにて溶湯Ｍが冷却ロールＲに接触する直前の範囲を設定し、その範囲内での最高温度をＴ１とした。冷却ロール表面上で凝固後に距離Ｌ（ｍ）の範囲を設定し、その範囲内での最高温度をＴ２とした。Ｔ１とＴ２との温度差ΔＴ（Ｋ）から冷却速度を下式により算出した。本実施例においては、Ｌ＝０．００５ｍとした。ｖは、冷却ロールＲの周速度［ｍ／ｓ］である。 That is, as shown in FIG. 5, the range immediately before the molten metal M contacts the cooling roll R is set by the infrared camera K, and the maximum temperature within the range is set to T1. A range of distance L (m) was set after solidification on the surface of the chill roll, and the maximum temperature within the range was defined as T2. The cooling rate was calculated from the temperature difference ΔT (K) between T1 and T2 by the following equation. In this embodiment, L = 0.005 m. v is the peripheral speed [m / s] of the cooling roll R.
冷却速度［Ｋ／ｓ］＝ΔＴ・ｖ／Ｌ
本実施例では、冷却速度をフィードバック制御しないで、図６に示すように吐出時間の経過に伴い漸次降下する冷却速度を（Ｉ）１０６Ｋ／ｓ以上、（II）１０５〜１０６Ｋ／ｓ、（III）１０５Ｋ／ｓ以下の３水準に区分して、各区分で生成した薄帯を分別して回収した。回収容器として、３槽を円形に組み合わせた回収容器を用い、各冷却速度区間の境目で順次回転させて３水準に振り分け回収した。
Cooling rate [K / s] = ΔT · v / L
In this embodiment, the cooling rate that gradually decreases with the elapse of the discharge time as shown in FIG. 6 is (I) 10 6 K / s or more and (II) 10 5 to 10 6 K without feedback control of the cooling rate. / S, (III) It was classified into three levels of 10 5 K / s or less, and the ribbons produced in each category were separated and collected. As a collection container, a collection container in which three tanks were combined in a circle was used, and was sequentially rotated at the boundary of each cooling rate section, and was collected in three levels.
回収した３種類の薄帯Ｉ、II、IIIについて、ＶＳＭによる磁気特性の測定と、ＳＥＭによる組織観察を行なった。図７および表２に、測定結果を示す。 The three kinds of collected ribbons I, II, and III were measured for magnetic properties by VSM and observed for structure by SEM. FIG. 7 and Table 2 show the measurement results.
上記の結果から、冷却速度が（Ｉ）１０６Ｋ／ｓ以上、（II）１０５〜１０６Ｋ／ｓ、（III）１０５Ｋ／ｓ以下と変化するのに伴って保磁力が変化している。保磁力は、冷却速度中間域IIで最も高く、冷却速度最低域IIIでやや低下し、冷却速度最高域Ｉで最も低い。 From the above results, the coercive force changes as the cooling rate changes to (I) 10 6 K / s or more, (II) 10 5 to 10 6 K / s, (III) 10 5 K / s or less. doing. The coercive force is highest in the middle cooling rate region II, slightly lower in the lowest cooling rate region III, and lowest in the highest cooling rate region I.
図８に、冷却速度が（１）最低域IIIおよび（２）中間域IIの薄帯の厚さ断面についてＳＥＭによる組織写真を示す。図８（１）の冷却速度最低域IIIの薄帯では、ロール面（最高速急冷凝固部）が微細結晶粒組織であるが、フリー面（最低速急冷凝固部）では粗大な結晶粒組織が観察される。図８（２）の冷却速度中間域IIの薄帯では、ロール面からフリー面にかけて薄帯断面全体が微細結晶粒組織であることが分かる。すなわち、微細結晶粒組織であることにより高い保磁力が得られた。冷却速度最高域Ｉについては、組織写真を示していないが、薄帯断面全体が非晶質であり、良好な磁性の発現には結晶化熱処理が必要である、と推察される。 FIG. 8 shows a structure photograph by SEM of the thickness cross section of the ribbon having a cooling rate of (1) the lowest region III and (2) the intermediate region II. 8 (1), the roll surface (the fastest rapid solidification part) has a fine grain structure in the ribbon of the lowest cooling rate region III, but the coarse grain structure on the free surface (lowest rapid quenching part). Observed. In the thin ribbon in the cooling rate intermediate region II in FIG. 8B, it can be seen that the entire cross section of the thin ribbon has a fine crystal grain structure from the roll surface to the free surface. That is, a high coercive force was obtained due to the fine grain structure. Although the structure photograph is not shown for the maximum cooling rate region I, it is assumed that the entire cross section of the ribbon is amorphous, and that crystallization heat treatment is necessary for the development of good magnetism.
〔実施例２〕
実施例１と同様の条件および手順により同じ合金組成の薄帯を作製した。冷却速度中間域II（１０５〜１０６Ｋ／ｓ）の回収槽から薄帯２ｇを採取し、放電プラズマ焼結（ＳＰＳ：Spark Plasma Sintering）により、１００ＭＰａ加圧下にて、５７０℃加熱、５ｍｉｎ保持で焼結した。
[Example 2]
A ribbon having the same alloy composition was produced under the same conditions and procedures as in Example 1. 2 g of a ribbon is taken from a recovery tank in the cooling rate intermediate region II (10 5 to 10 6 K / s) and heated at 570 ° C. under a pressure of 100 MPa by spark plasma sintering (SPS) for 5 minutes. Sintered by holding.
比較例として、実施例２で作製した３水準の冷却速度域Ｉ、II、IIIの回収槽の薄帯を混合して、混合物から無作為に２ｇ採取し、放電プラズマ焼結（ＳＰＳ：Spark Plasma Sintering）により、１００ＭＰａ加圧下にて、５７０℃加熱、５ｍｉｎ保持で焼結した。 As a comparative example, the ribbons of the recovery tanks of the three levels of cooling rates I, II, and III prepared in Example 2 were mixed, and 2 g were randomly sampled from the mixture and subjected to spark plasma sintering (SPS: Spark Plasma). Sintering), sintering was performed at a pressure of 100 MPa and heated at 570 ° C. for 5 minutes.
実施例２および比較例の焼結体について、ＶＳＭによる磁気特性の測定およびＳＥＭによる組織観察を行なった。 For the sintered bodies of Example 2 and the comparative example, the magnetic properties were measured by VSM and the structure was observed by SEM.
図９に、実施例２および比較例について、焼結体の減磁曲線を示す。冷却速度中間域II（１０５〜１０６Ｋ／ｓ）で生成した薄帯のみを用いた実施例２の焼結体は、３水準の冷却域で生成した薄帯を混合した比較例の焼結体に比べて、高い保磁力が得られた。 FIG. 9 shows the demagnetization curves of the sintered bodies for Example 2 and the comparative example. The sintered body of Example 2 using only the ribbons produced in the cooling rate intermediate zone II (10 5 to 10 6 K / s) is a comparative example in which the ribbons produced in the three-level cooling zone are mixed. High coercive force was obtained compared to the bonded body.
図１０に、実施例２および比較例について、組織のＳＥＭ像を示す。図１０（１）に示すように、実施例２の焼結体は均一な微細粒組織が観察された。これに対して、図１０（２）に示すように、比較例の焼結体には粗大粒が混在する組織が観察された。これは冷却速度最低域IIIで生成した薄帯中の粗大粒が混在したためである。また、冷却速度最高域Ｉ（１０６Ｋ／ｓ以上）で生成した薄帯の非晶質組織と微細結晶組織が混在した薄帯において、焼結時に一部が粗大化した可能性も考えられる。 In FIG. 10, the SEM image of a structure | tissue is shown about Example 2 and a comparative example. As shown in FIG. 10 (1), a uniform fine grain structure was observed in the sintered body of Example 2. On the other hand, as shown in FIG. 10 (2), a structure in which coarse grains were mixed was observed in the sintered body of the comparative example. This is because coarse grains in the ribbon formed in the lowest cooling rate region III are mixed. In addition, in a thin ribbon in which the amorphous structure and the fine crystalline structure of the ribbon generated in the maximum cooling rate region I (10 6 K / s or more) are mixed, there is a possibility that a part of the ribbon is coarsened during sintering. .
このように、急冷凝固時の冷却速度の変動による種々の組織の混在により磁気特性が劣化する。本発明により、冷却速度に連動して、適正な冷却速度で生成した薄帯を選択的に回収することにより、均一な微細粒組織が得られ、安定して良好な磁気特性が確保できる。 As described above, the magnetic characteristics are deteriorated due to the mixture of various structures due to the fluctuation of the cooling rate during the rapid solidification. According to the present invention, a thin ribbon formed at an appropriate cooling rate is selectively recovered in conjunction with the cooling rate, whereby a uniform fine grain structure can be obtained and stable and good magnetic properties can be secured.
本発明によれば、急冷凝固により磁石合金の薄帯を製造する際に、望ましくない冷却速度で生成した薄帯の混在を防止することにより、均一な微細組織とそれによる優れた磁気特性を達成することができる磁石薄帯の製造方法および製造装置が提供される。 According to the present invention, when a ribbon of magnet alloy is manufactured by rapid solidification, a uniform microstructure and excellent magnetic properties are achieved by preventing the mixing of ribbons generated at an undesirable cooling rate. A method and apparatus for producing a magnet ribbon that can be provided are provided.
Ｒ 冷却ロール
Ｓ 冷却ロールＲの表面
Ｘ 冷却ロールＲの回転軸
Ｖ 冷却ロールＲの回転方向
Ｔ 冷却ロールＲの往復移動方向
Ｍ 磁石合金の溶湯
Ｎ ノズル
Ｈ 誘導コイル
Ｐ 誘導コイルと冷却ロール表面との間に設けた遮蔽板
Ｂ 磁石合金の薄帯（急冷リボン）
Ｄ 薄帯の生成方向
Ａ 薄帯の回収機構
１００ 回収容器
１１０ 回収槽（適正薄帯用）
１２０ 回収槽（不適正薄帯用）
１３０ 案内スリーブ
１４０ 振り分け板
R Cooling roll S Surface of cooling roll R X Rotating shaft of cooling roll R V Rotating direction of cooling roll R T Reciprocating direction of cooling roll R M Molten metal alloy N Nozzle H Induction coil P Induction coil surface and cooling roll surface Shielding plate provided between them B Magnetic alloy ribbon (quenched ribbon)
D Thin ribbon generation direction A Thin strip recovery mechanism 100 Recovery container 110 Recovery tank (for appropriate strip)
120 Collection tank (for inappropriate ribbon)
130 Guide sleeve 140 Sorting plate
Claims (6)
上記急冷凝固する溶湯の冷却速度を連続的に測定し、所定の凝固組織が生成する範囲内の冷却速度で生成した薄帯を選択的に回収することを特徴とする磁石薄帯の製造方法。 In the manufacturing method of the magnet ribbon that discharges the molten metal alloy onto the surface of the cooling roll and rapidly solidifies,
A method for producing a magnet ribbon, comprising: continuously measuring a cooling rate of the rapidly solidified molten metal and selectively recovering the ribbon generated at a cooling rate within a range in which a predetermined solidified structure is generated.
上記急冷凝固する溶湯の冷却速度を連続的に測定する冷却速度測定手段と、所定の凝固組織が生成する範囲内の冷却速度で生成した薄帯を選択的に回収する回収手段とを有することを特徴とする磁石薄帯の製造装置。 In a magnet ribbon manufacturing apparatus that rapidly cools and solidifies by discharging a molten metal alloy onto the surface of a cooling roll,
A cooling rate measuring means for continuously measuring the cooling rate of the rapidly solidified molten metal, and a recovery means for selectively recovering the ribbon generated at a cooling rate within a range where a predetermined solidified structure is generated. An apparatus for producing a magnet ribbon.
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| JP2021065901A (en) * | 2019-10-22 | 2021-04-30 | 大同特殊鋼株式会社 | Method and device for manufacturing metal strip |
| WO2023106008A1 (en) * | 2021-12-07 | 2023-06-15 | ミネベアミツミ株式会社 | Method for producing rare earth iron sintered magnet, apparatus for producing rare earth iron sintered magnet, and rare earth iron sintered magnet |
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