JPH01112716A - Manufacture of ring magnet with special inside-diameter configuration - Google Patents
Manufacture of ring magnet with special inside-diameter configurationInfo
- Publication number
- JPH01112716A JPH01112716A JP27120887A JP27120887A JPH01112716A JP H01112716 A JPH01112716 A JP H01112716A JP 27120887 A JP27120887 A JP 27120887A JP 27120887 A JP27120887 A JP 27120887A JP H01112716 A JPH01112716 A JP H01112716A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- shape
- sintering
- circle
- ring magnet
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000005245 sintering Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 4
- 239000000956 alloy Substances 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 4
- 229910052723 transition metal Inorganic materials 0.000 claims description 4
- 238000000748 compression moulding Methods 0.000 claims description 2
- 150000003624 transition metals Chemical class 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 150000002739 metals Chemical class 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 230000001052 transient effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、内径が非円形の特殊形状をしたリング状の希
土類−遷移金属系永久磁石の内面研削等を不要とする製
造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a ring-shaped rare earth-transition metal permanent magnet having a special shape with a non-circular inner diameter, which eliminates the need for internal grinding or the like.
希土類（Ｒ）一遷移金属（ＴＭ）系永久磁石、例えばＲ
ＣＯＳ， ＲｚＣｏｌｔ＋ ＲｚＦｅｌ４Ｂ磁石は全て
金属間化合物によるものであるため硬い。従って、内面
中空、特に非円形（例えば楕円，長円）のリング状磁石
の製造においては、内面研削等の機械加工を必須として
いた。Rare earth (R)-transition metal (TM) based permanent magnets, such as R
COS, RzColt+ RzFel4B magnets are all made of intermetallic compounds and are therefore hard. Therefore, in manufacturing a ring-shaped magnet with a hollow inner surface, especially a non-circular (for example, elliptical or elliptical) magnet, machining such as inner surface grinding is indispensable.
なお、成形体の外形を楕円形として焼結することにより
焼結後に円形とする製造方法も提案されている（特開昭
５９−１９３０３号公報参照）。A manufacturing method has also been proposed in which the outer shape of the molded body is sintered into an elliptical shape, thereby making it circular after sintering (see Japanese Patent Laid-Open Publication No. 19303/1983).
゜しかじ、内面研削は硬質の焼結体を砥石等によって加
工するものであり、コスト高となることのみならず、加
工途中に磁石の割れ、欠けが発生しやすかった。However, internal grinding involves processing a hard sintered body using a grindstone or the like, which not only increases costs, but also tends to cause the magnet to crack or chip during processing.
また、特殊形状の金型の加工費は極めて高いものであっ
た。In addition, the processing costs for specially shaped molds were extremely high.
また、外形を楕円形として焼結後円形とする前述の製造
方法も、収縮の異方性のために制御は極めて困難であり
、実用には至らなかった。Further, the above-mentioned manufacturing method in which the outer shape is made into an elliptical shape and becomes circular after sintering is extremely difficult to control due to the anisotropy of shrinkage, and has not been put to practical use.
本発明は、希土類元素の一種以上と遷移金属の一種以上
からなる合金粉末を、圧縮成形、焼結。The present invention involves compression molding and sintering an alloy powder consisting of one or more rare earth elements and one or more transition metals.
熱処理をして磁石を製造する方法において、非円筒形状
の物体を中芯に入れた状態で焼結することを特徴とする
特許
である。This patent is a method for manufacturing magnets by heat treatment, which is characterized by sintering a non-cylindrical object inside the core.
本発明において、非円筒形状とは長円、楕円等の円形以
外の形状を言う．物体は金属でも、セラミクスでもよく
、焼結温度に十分耐えられ、かつ磁石との反応を起こさ
ないものならば何でもよい。In the present invention, a non-cylindrical shape refers to a shape other than a circle, such as an ellipse or an ellipse. The object may be metal or ceramic, or anything that can withstand the sintering temperature and does not react with the magnet.
本発明は、従来通り円形の中空部なるように成形した成
形体の中芯に第１図に示すように製品要求形状、例えば
楕円の焼結用治具を挿入して焼結すると収縮過程で治具
の形状に倣い最終製品ができることを見出したものであ
る。In the present invention, a sintering jig having a shape required for the product, for example, an ellipse, as shown in FIG. It was discovered that the final product can be made following the shape of the jig.
なお、本発明においては内径の形状には一定の制限があ
る．つまり、第２図に示す楕円形の場合には短径をＤｌ
とした場合、長径は１．１００１以下でないと本発明の
効果が得られない．第３図に示す長円形の場合には、円
形部分の曲率半径をｒ，とした時、中心点間の距離ｌは
Ｑ，ｌＸｒ，の範囲にあることが必要である。Note that in the present invention, there are certain restrictions on the shape of the inner diameter. In other words, in the case of the ellipse shown in Figure 2, the minor axis is Dl.
In this case, the effect of the present invention cannot be obtained unless the major axis is 1.1001 or less. In the case of the oval shape shown in FIG. 3, the distance l between the center points must be in the range of Q, lXr, when the radius of curvature of the circular part is r.
以下、実施例によって、本発明を具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to Examples.
（実施例１）
重量比でＳｍ２６％，Ｃｏ５２％，Ｆｅｌ５％，Ｃｕ４
％，Ｚｒ３％なる組成の合金をアーク溶解で作製し、水
冷銅鋳型の中に鋳造してインゴットとした。水をブラウ
ンミルで５０μ程度に粗粉砕した後、Ｎ２中ジエツトミ
ルで平均粒度５μに微粉砕した。(Example 1) Weight ratio Sm26%, Co52%, Fel5%, Cu4
An alloy having a composition of 3% and 3% Zr was produced by arc melting, and cast into a water-cooled copper mold to form an ingot. The water was coarsely pulverized in a Brown mill to a particle size of about 50 μm, and then finely pulverized to an average particle size of 5 μm in a jet mill in N2.
この粉末を圧縮方向と直角方向にｌＱＫＯｅの磁場を印
加した状態で３．０００ ｋｇ／一で圧縮成形した。This powder was compression molded at 3.000 kg/1 with a magnetic field of 1QKOe applied in a direction perpendicular to the compression direction.
成形体は外径７６×内径５５×厚さ１４（ｔｍ）のリン
グ形状とした。それから成形体の中空部にＳＵＳ３０４
で作製した長径４９，短径４６ｈｎ）の楕円断面をした
治具を挿入した状態で１２００℃×１時間焼結した．焼
結体は炉冷して室温まで取り出したところ割れ、欠けの
ない製品が得られた．しかも、内径の寸法公差は±０．
０５ｍｍ以内におさまるうえ、外観上も艶があり、表面
粗さを測定したら５μであった。The molded body had a ring shape with an outer diameter of 76 x inner diameter of 55 x thickness of 14 (tm). Then, the hollow part of the molded body was made of SUS304.
The sample was sintered at 1200°C for 1 hour with a jig with an elliptical cross section with a major axis of 49 mm and a minor axis of 46 hn prepared in the above process being inserted. When the sintered body was cooled in the furnace and taken out to room temperature, a product with no cracks or chips was obtained. Moreover, the dimensional tolerance of the inner diameter is ±0.
The surface roughness was within 0.05 mm and had a glossy appearance, and the surface roughness was 5 μm when measured.
比較例として、従来の内面研削によって同一形状のもの
を製造したところ、内面の寸法公差は±０、１２０、表
面粗さは２３μであった。As a comparative example, when the same shape was manufactured by conventional internal grinding, the internal dimensional tolerance was ±0.120, and the surface roughness was 23μ.
従って、本発明による内面楕円形状を有するリング磁石
の優れていることがわかる。Therefore, it can be seen that the ring magnet having an inner elliptical shape according to the present invention is superior.
（実施例２）
実施例１と同様にして、内面形状を長円形状としたもの
を製造した。第３図の記号で示すとｒ＝３０ｍ■、Ｉｌ
＝５ｍのものであり、この場合も内面は無加工で精度±
０．０８ｍｍ，表面粗さ１２μのものが得られた。(Example 2) In the same manner as in Example 1, an inner surface having an oval shape was manufactured. Indicated by the symbols in Figure 3, r=30m■, Il
= 5m, and in this case too, the inner surface is unprocessed and the accuracy is ±
A sample having a diameter of 0.08 mm and a surface roughness of 12 μm was obtained.
本発明によれば、従来の内面研削等では得ることができ
なかった高精度で、かつ表面粗さも小さな特殊形状の内
径をもったリング磁石が安価に大量生産できる。According to the present invention, it is possible to inexpensively mass-produce a ring magnet having a specially shaped inner diameter with high precision and small surface roughness, which could not be obtained by conventional internal grinding or the like.
第１図は、本発明の一実施例を示す図、第２図は本発明
によって作った内面が楕円形のリング磁石を示す図、第
３図は本発明によって作った内面が長円形のリング磁石
を示す図である。
第１図
第２図
第３図FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a ring magnet having an oval inner surface made according to the present invention, and FIG. 3 is a diagram showing a ring magnet having an oval inner surface made according to the present invention. It is a figure showing a magnet. Figure 1 Figure 2 Figure 3
Claims (3)
る合金粉末を、圧縮成形、焼結、熱処理をして磁石を製
造する方法において、非円筒形状の物体を中芯に入れた
状態で焼結することを特徴とする内径特殊形状リング磁
石の製造方法。1. A method of manufacturing a magnet by compression molding, sintering, and heat treating an alloy powder consisting of one or more rare earth elements and one or more transition metals, in which a non-cylindrical object is sintered in the core. A method for manufacturing a ring magnet with a special inner diameter shape.
求の範囲第１項に記載の内径特殊形状リング磁石の製造
方法。2. The method for manufacturing a ring magnet with a special inner diameter shape according to claim 1, wherein the non-cylindrical shape is an ellipsoid.
＿１以下であることを特徴とする特許請求の範囲第１項
又は第２項に記載の内径特殊形状リング磁石の製造方法
。3. If the short axis of the ellipse is D_1, the long axis is 1.10D
The method for manufacturing a ring magnet with a special inner diameter shape according to claim 1 or 2, wherein the inner diameter is _1 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27120887A JPH01112716A (en) | 1987-10-27 | 1987-10-27 | Manufacture of ring magnet with special inside-diameter configuration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27120887A JPH01112716A (en) | 1987-10-27 | 1987-10-27 | Manufacture of ring magnet with special inside-diameter configuration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01112716A true JPH01112716A (en) | 1989-05-01 |
Family
ID=17496855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27120887A Pending JPH01112716A (en) | 1987-10-27 | 1987-10-27 | Manufacture of ring magnet with special inside-diameter configuration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01112716A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6625872B1 (en) | 1999-01-06 | 2003-09-30 | Murata Manufacturing Co., Ltd. | Method for sintering magnetic core |
| EP1675140A2 (en) * | 2004-12-21 | 2006-06-28 | TDK Corporation | Cylindrical sintered magnet, motor and method for producing cylindrical sintered magnet |
| JP2010136578A (en) * | 2008-12-08 | 2010-06-17 | Asmo Co Ltd | Rotor and motor |
-
1987
- 1987-10-27 JP JP27120887A patent/JPH01112716A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6625872B1 (en) | 1999-01-06 | 2003-09-30 | Murata Manufacturing Co., Ltd. | Method for sintering magnetic core |
| EP1675140A2 (en) * | 2004-12-21 | 2006-06-28 | TDK Corporation | Cylindrical sintered magnet, motor and method for producing cylindrical sintered magnet |
| EP1675140A3 (en) * | 2004-12-21 | 2010-11-10 | TDK Corporation | Cylindrical sintered magnet, motor and method for producing cylindrical sintered magnet |
| JP2010136578A (en) * | 2008-12-08 | 2010-06-17 | Asmo Co Ltd | Rotor and motor |
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