JPH0612727B2 - Manufacturing method of oxide permanent magnet - Google Patents
Manufacturing method of oxide permanent magnetInfo
- Publication number
- JPH0612727B2 JPH0612727B2 JP59176720A JP17672084A JPH0612727B2 JP H0612727 B2 JPH0612727 B2 JP H0612727B2 JP 59176720 A JP59176720 A JP 59176720A JP 17672084 A JP17672084 A JP 17672084A JP H0612727 B2 JPH0612727 B2 JP H0612727B2
- Authority
- JP
- Japan
- Prior art keywords
- molding
- permanent magnet
- oxide
- upper punch
- 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.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 230000005291 magnetic effect Effects 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 description 28
- 238000005498 polishing Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は酸化物永久磁石の製造法に係り、特に湿式成形
によって製造される酸化物永久磁石の製造方法に関す
る。The present invention relates to a method for manufacturing an oxide permanent magnet, and more particularly to a method for manufacturing an oxide permanent magnet manufactured by wet molding.
［従来の技術］ 一般に、ＭＯ・６Ｆｅ２Ｏ３（ＭはＢａまたはＳｒ）等
からなるフェライト異方性磁石である酸化物永久磁石を
湿式成形によって成形するには、酸化物磁性微粉末を液
体からなる分散媒に懸濁したスラリーを、成形型のキャ
ビティ内に圧送充填し、磁場中で加圧することでキャビ
ティ内から液体を排除しながら成形するものである。In the prior art] Generally, an oxide permanent magnets (in M B a or Sr) MO · 6F e2 O 3 ferrite anisotropic magnet made of such a molding by wet molding, an oxide magnetic powder A slurry suspended in a dispersion medium composed of a liquid is pressure-filled into a cavity of a molding die and pressurized in a magnetic field to remove the liquid from the cavity during molding.
しかしながら、従来の成形品は磁石の濾過体側の縁端部
が、成型と同時に面取りを形成することが困難であった
ため、シャープエッジとなっており、磁石の研摩時等に
カケ、ハガレ等の欠陥が生じやすく歩留まりを落とす原
因の１つとなっていた。However, in the conventional molded product, it was difficult to form a chamfer at the edge of the magnet on the filter body side at the same time as molding, resulting in a sharp edge, resulting in defects such as chipping and peeling when polishing the magnet. This is one of the reasons why the yield is likely to occur.
又、磁石の濾過体側の縁端部がシャープエッジのままモ
ーター等の組み立てに用いられると、組み立て時カケが
発生しやすく、モーターの異常音発生やモーターロック
の原因ともなっていた。このため、モーター等に利用さ
れる湿式成形のセグメント磁石はその濾過体側の縁端部
に面取りを施す必要がある。しかし、成形と同時に磁石
の濾過体側の縁端部に面取り部分を形成しようとする
と、クラック等が多く発生して良品が得られないため、
成形後に手作業で研摩し、面取りを施したり、燒結後に
砥石を具備した機械で研摩して面取りを施し、研摩時に
於けるカケ、ハガレ発生の防止及びモーター等の組み立
て時のカケ発生を防止している。このため、該面取り磁
石は生産効率が悪く、コスト高になっているが現状であ
る。If the edge of the magnet on the filter body side is used as a sharp edge for assembling a motor or the like, chipping is likely to occur during assembly, which causes abnormal noise of the motor and causes a motor lock. For this reason, it is necessary to chamfer the edge portion on the filter body side of the wet-molded segment magnet used for a motor or the like. However, if an attempt is made to form a chamfered portion at the edge of the magnet on the filter body side at the same time as molding, many cracks will occur and a good product cannot be obtained.
After molding, chamfer by hand and chamfer, or after sintering, chamfer by grinding with a machine equipped with a grindstone to prevent chipping and chipping during polishing and chipping during motor assembly. ing. For this reason, the chamfered magnet has a low production efficiency and a high cost, but at present.
［発明が解決しようとする課題］ 本発明は上述の事情に鑑みてなされたものであり、作業
性を良好にして歩留まりを向上せしめた酸化物磁性微粉
末の湿式加工成形品からなり、該成形品の水抜き用濾過
体側の少なくとも片面の縁端部が面取りされていること
を特徴とする酸化物永久磁石の製造法を提供することを
目的としている。[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and includes a wet-processed molded product of an oxide magnetic fine powder which has improved workability and improved yield. It is an object of the present invention to provide a method for producing an oxide permanent magnet, characterized in that at least one edge of the product on the side of the filter body for draining water is chamfered.
［問題点を解決するための手段］ この目的を達成するため本発明は、成形条件を検討した
結果、面取角度が１０度〜４５度の面取り部が形成され
た上パンチと、下パンチとダイとによってキャビティが
形成され、このキャビティ内に酸化物磁性微粉末を懸濁
したスラリーを圧送充填し、磁場中成形する際にスラリ
ー内の液体を上パンチ側に設けた濾過体で濾過する製造
法によって、成形と同時に、成形品の水抜き用濾過体側
の少なくとも片面の縁端部に面取角度が１０度〜４５度
の面取り部分を形成することを可能としたものである。[Means for Solving the Problems] In order to achieve this object, as a result of examining molding conditions, the present invention provides an upper punch and a lower punch each having a chamfered portion with a chamfering angle of 10 to 45 degrees. A cavity is formed by a die, and a slurry in which magnetic oxide fine powder is suspended is pressure-fed and filled into the cavity, and the liquid in the slurry is filtered by a filter provided on the upper punch side when molding in a magnetic field. According to the method, it is possible to form a chamfered portion having a chamfering angle of 10 to 45 degrees at the edge of at least one surface of the molded article on the side of the filter body for draining water simultaneously with the molding.
［作用］ 面取角度を１０度〜４５度とすることにより、湿式成形
において成形と同時に少なくとも片面の縁端部が面取り
された、クラックのない、酸化物永久磁石が製造でき
る。[Operation] By setting the chamfering angle to 10 degrees to 45 degrees, it is possible to manufacture a crack-free oxide permanent magnet in which at least one edge is chamfered at the same time as molding in wet molding.
［実施例］ 以下、本発明の一実施例を添付の図面を参照して具体的
に説明する。[Embodiment] An embodiment of the present invention will be specifically described below with reference to the accompanying drawings.
第１図は本発明の一実施例による酸化物永久磁石１の斜
視図であり、弓形に湾曲され、上面部２が弱磁性面とな
り、下面部が強磁性面となっており、Ｍは磁化容易軸方
向である。この磁石は酸化物磁性微粉末を湿式によって
加圧することで弓形状に成形され、弱磁性面である上面
部２の前後の縁端部が所定角度のテーパ面４，４となる
ように面取りされており、上面部２とテーパ面４とのな
す角度を面取角度とする。湿式成形では面取部にクロス
や紙などの濾過体があるために加圧中にそれらがたわむ
ことなどによってクラックが発生しやすく、従来は成形
と同時に面取りを形成することが困難であった。また、
加工研削によりクラックが顕在化しやすい。このクラッ
ク防止のためには、面取角度が４５度以下、好ましくは
３０〜１０度の範囲であることが判明した。従って、前
記面取角度は４５〜１０度の範囲に湿式成形する。FIG. 1 is a perspective view of an oxide permanent magnet 1 according to an embodiment of the present invention, which is curved in an arc shape, an upper surface 2 is a weak magnetic surface, a lower surface is a ferromagnetic surface, and M is a magnetization. Easy axis direction. This magnet is formed into a bow shape by pressing the oxide magnetic fine powder by a wet process, and the front and rear edges of the upper surface 2 which is a weak magnetic surface are chamfered so as to form tapered surfaces 4 and 4 at predetermined angles. The chamfer angle is defined by the angle between the upper surface 2 and the tapered surface 4. In wet molding, since there is a filter such as cloth or paper in the chamfered portion, cracks are likely to occur due to bending of the filter during pressurization, and conventionally it was difficult to form a chamfer simultaneously with molding. Also,
Cracks are easily revealed by processing and grinding. In order to prevent this crack, it has been found that the chamfer angle is 45 degrees or less, preferably in the range of 30 to 10 degrees. Therefore, the chamfering angle is wet-molded in the range of 45 to 10 degrees.
上記のように面取角度を１０度〜４５度とすることによ
り、成形と同時に少なくとも片面の縁端部が面取りされ
た酸化物永久磁石をクラックが発生することなく、得る
ことが可能となる。この面取りの形成によって磁石の研
摩時に於けるカケ、ハガレの発生が効果的に防止されて
歩留まりが向上するが、この面取りは磁石１の加圧成形
時に成形と同時に形成されるものであり、手作業による
面取りや機械面取りに比べて面取り工程を省略できるこ
と及びカケ、ハガレ発生の要因が除去できるので、研摩
のスピードを上げることも可能となり、コストダウンに
つながる。By setting the chamfering angle to 10 to 45 degrees as described above, it is possible to obtain an oxide permanent magnet having a chamfered edge portion on at least one side at the same time as molding without cracking. The formation of this chamfer effectively prevents the occurrence of chipping and peeling during polishing of the magnet and improves the yield, but this chamfer is formed at the same time as the molding of the magnet 1 during pressure molding. Since the chamfering process can be omitted as compared with chamfering by work or machine chamfering, and the cause of chipping and peeling can be eliminated, polishing speed can be increased, leading to cost reduction.
第２図及び第３図はこの面取りを成形と同時に行うため
の成形型であり、１１は支柱１２によって床上に支承さ
れたダイス、１３は上パンチ、１４は下パンチである。
そして、１５はダイス１１の外周部分に取り付けられた
磁場コイルであり、成形の際に配向可能とするものであ
る。各パンチ１３及び１４はシリンダ１６，１７によっ
て上下に移動可能となっており、上パンチ１３は下降し
てダイス１１の上面に当接し、又、下パンチ１４はダイ
ス１１に開設された貫通部内を上昇して加圧成形を行う
ようになっている。従って、酸化物磁性微粉末のスラリ
ーは上パンチ１３、下パンチ１４及びダイス１１によっ
て形成されたキャビティ内に充填されて成形されるもの
であり、このため、ダイス１１にはキャビティに連通す
る供給路１７が形成されている。2 and 3 show a forming die for simultaneously carrying out this chamfering simultaneously with forming, 11 is a die supported on the floor by the columns 12, 13 is an upper punch, and 14 is a lower punch.
A magnetic field coil 15 is attached to the outer peripheral portion of the die 11 and can be oriented during molding. The punches 13 and 14 can be moved up and down by the cylinders 16 and 17, the upper punch 13 descends and abuts the upper surface of the die 11, and the lower punch 14 moves inside the penetrating portion formed in the die 11. It is designed to rise and perform pressure molding. Therefore, the slurry of the oxide magnetic fine powder is filled and molded in the cavity formed by the upper punch 13, the lower punch 14 and the die 11. Therefore, the die 11 has a supply path communicating with the cavity. 17 are formed.
前記上パンチ１３は第１図に示す永久磁石１の弱磁性面
２を形成し、又、下パンチ１４は強磁性面を形成するも
のである。前記各パンチ１３，１４には成形される永久
磁石の形状に合わせた窪み部１３ａ及び隆起部１４ａが
夫々、形成されている。又、上パンチ１３には加圧によ
ってスラリーから押し出される液体を外部に配設するた
めの排液孔１８，１８…が複数穿設されており、この排
液孔１８，１８…が排液路１９に連通している。さら
に、上パンチ１３側には濾過体２０が取り付けられてお
り、加圧時に液体のみを排液孔１８内に押し出し、磁性
微粉末をキャビティ内に溜める作用をなしている。この
濾過体はロール２１，２１に巻回されており、該ロール
の回転で適宜、巻き取りされるようになっており、交換
を要することなく連続成形が可能となっている。The upper punch 13 forms the weak magnetic surface 2 of the permanent magnet 1 shown in FIG. 1, and the lower punch 14 forms the ferromagnetic surface. Each of the punches 13 and 14 is formed with a recess 13a and a protrusion 14a that match the shape of the permanent magnet to be formed. Further, the upper punch 13 is provided with a plurality of drainage holes 18, 18 for arranging the liquid pushed out from the slurry by pressure to the outside, and these drainage holes 18, 18 ... It communicates with 19. Further, a filter body 20 is attached to the side of the upper punch 13 and has a function of pushing out only the liquid into the drain hole 18 at the time of pressurization and collecting the magnetic fine powder in the cavity. This filter body is wound around rolls 21 and 21, and is appropriately wound by the rotation of the rolls, and continuous molding is possible without requiring replacement.
第４図乃至第６図は前記上パンチ１３を示しており、成
形のための窪み部１３ａ，１３ａが形成されている。そ
して、この窪み部１３ａの両側端部には面取り部１３ｂ
が形成され、永久磁石１の縁端部の面取りを行うように
なっている。この面取り部１３ｂは窪み部１３ａの底面
から一定の勾配で傾斜して突出している。この場合、面
取り部１３ｂの傾斜角度は４５度以下が好ましく、望ま
しくは３０〜１０度が良好である。４５度以上の場合に
は加圧成形の際に応力が集中して濾過体のたわみが大き
くなり、クラックが発生しやすくなるので、良好な成型
体が得られないためである。また、１０度未満では面取
りを形成することによる効果が得られなくなるからであ
る。 4 to 6 show the upper punch 13 in which recesses 13a, 13a for forming are formed. Then, chamfered portions 13b are provided at both end portions of the recessed portion 13a.
Is formed to chamfer the edge of the permanent magnet 1. The chamfered portion 13b is inclined and protrudes from the bottom surface of the recess 13a at a constant gradient. In this case, the angle of inclination of the chamfered portion 13b is preferably 45 degrees or less, and more preferably 30 to 10 degrees. This is because if it is 45 degrees or more, stress concentrates during pressure molding, the deflection of the filter body becomes large, and cracks easily occur, so that a good molded body cannot be obtained. On the other hand, if the angle is less than 10 degrees, the effect of forming the chamfer cannot be obtained.
次いで、以上のように構成された装置によって酸化物永
久磁石を成形する場合を第３図を参照して説明する。シ
リンダ１６の作動で上パンチ１３がダイス１１の上面に
当接すると共に、下パンチ１４が下降して上パンチ１
３、ダイス１１及び下パンチ１４によって成形のための
キャビティが形成され、このキャビティ内に酸化物磁性
微粉末のスラリーが圧送、充填される。この圧送はキャ
ビティに開口した供給路１７から行われ、この供給の後
に、下パンチ１４が上昇してスラリーを加圧する。この
加圧によってスラリー内の液体は濾過体２０で濾過され
て排液孔１８内に押し出され、排液口１９から外部に排
出されると共に、磁性微粉末は上パンチ１３と下パンチ
１４によって圧搾され、所定形状の永久磁石１が成形さ
れる。そして、この成形の際には上パンチ１３の面取り
部１３ｂによって成形品の縁端部が面取りされる。な
お、かかる面取りは永久磁石の上面部のみでなく、下面
部にも形成してもよく、又、成形される永久磁石の形状
は第７図（イ）乃至（ロ）に示すように、磁石の用途に
応じて適宜変更が可能であり、いずれの場合にも縁端部
４が面取りされるものである。Next, a case where an oxide permanent magnet is molded by the apparatus configured as described above will be described with reference to FIG. The upper punch 13 comes into contact with the upper surface of the die 11 by the operation of the cylinder 16, and the lower punch 14 descends to move the upper punch 1 to the upper punch 1.
3, a cavity for molding is formed by the die 11 and the lower punch 14, and a slurry of oxide magnetic fine powder is pressure-fed and filled into the cavity. This pumping is performed from the supply path 17 opened to the cavity, and after this supply, the lower punch 14 moves up to pressurize the slurry. By this pressurization, the liquid in the slurry is filtered by the filter body 20 and pushed out into the drainage hole 18 and discharged from the drainage port 19 to the outside, while the magnetic fine powder is squeezed by the upper punch 13 and the lower punch 14. Then, the permanent magnet 1 having a predetermined shape is molded. At the time of this molding, the chamfered portion 13b of the upper punch 13 chamfers the edge of the molded product. The chamfering may be performed not only on the upper surface of the permanent magnet but also on the lower surface thereof, and the shape of the molded permanent magnet is as shown in FIGS. Can be appropriately changed according to the application, and in any case, the edge 4 is chamfered.
［発明の効果］ 以上説明した本発明によると、湿式成形において、成形
と同時に少なくとも片面の縁端部が面取りされた酸化物
永久磁石をクラックが発生することなく、得ることが可
能となる。また加圧成形された永久磁石の縁端部が面取
りされるため、該磁石を研摩する際カケ、ハガレ等の欠
陥の発生を防止でき、歩留りを向上させることができる
と共に、研摩のスピードを上げることも可能となる。
又、この面取りの形成は磁石の加圧成形と同時に行われ
るから作業性が良いのでコストダウンにつながる、とい
う効果がある。[Effects of the Invention] According to the present invention described above, it is possible to obtain an oxide permanent magnet having a chamfered edge portion on at least one side at the same time as molding without forming cracks in the wet molding. Further, since the edge portion of the pressure-molded permanent magnet is chamfered, defects such as chipping and peeling can be prevented when polishing the magnet, and the yield can be improved and the polishing speed can be increased. It is also possible.
In addition, since the chamfering is performed simultaneously with the pressure molding of the magnet, the workability is good and the cost can be reduced.
第１図は本発明の一実施例の斜視図、第２図及び第３図
はその成形のため装置の全体断面図及び要部の断面図、
第４図乃至第６図は上パンチの底面図、Ｖ−Ｖ線断面
図、VI−VI線断面図、第７図（イ）乃至（ハ）はいずれ
も別の実施例の斜視図である。 １……酸化物永久磁石、４……テーパ面、 １１……ダイス、１３……上パンチ、 １３ｂ……面取り部、１４……下パンチ、 ２０……濾過体。FIG. 1 is a perspective view of an embodiment of the present invention, FIGS. 2 and 3 are overall cross-sectional views of an apparatus for molding the same and cross-sectional views of essential parts,
4 to 6 are bottom views of the upper punch, sectional views taken along the line VV, sectional views taken along the line VI-VI, and FIGS. 7A to 7C are perspective views of another embodiment. . 1 ... Oxide permanent magnet, 4 ... Tapered surface, 11 ... Die, 13 ... Upper punch, 13b ... Chamfer part, 14 ... Lower punch, 20 ... Filter body.
Claims (1)
成された上パンチと、下パンチとダイとによってキャビ
ティが形成され、このキャビティ内に酸化物磁性微粉末
を懸濁したスラリーを圧送充填し、磁場中成形する際に
スラリー内の液体を上パンチ側に設けた濾過体で濾過す
ることを特徴とする酸化物永久磁石の製造法。1. A slurry in which an oxide magnetic fine powder is suspended in a cavity formed by an upper punch having a chamfered portion with a chamfering angle of 10 to 45 degrees, a lower punch and a die. The method for producing an oxide permanent magnet is characterized in that the liquid in the slurry is filtered by a filter provided on the upper punch side when the powder is filled by pressure and is molded in a magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59176720A JPH0612727B2 (en) | 1984-08-27 | 1984-08-27 | Manufacturing method of oxide permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59176720A JPH0612727B2 (en) | 1984-08-27 | 1984-08-27 | Manufacturing method of oxide permanent magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6154601A JPS6154601A (en) | 1986-03-18 |
| JPH0612727B2 true JPH0612727B2 (en) | 1994-02-16 |
Family
ID=16018593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59176720A Expired - Lifetime JPH0612727B2 (en) | 1984-08-27 | 1984-08-27 | Manufacturing method of oxide permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0612727B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008246526A (en) * | 2007-03-30 | 2008-10-16 | Tdk Corp | Powder molding equipment, molding die and permanent magnet |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0353445Y2 (en) * | 1987-08-19 | 1991-11-22 | ||
| JP3485485B2 (en) | 1998-12-28 | 2004-01-13 | 住友特殊金属株式会社 | Powder pressing device, punch and powder pressing method |
| CN102294477B (en) * | 2011-08-26 | 2013-06-19 | 四川川西磁业有限责任公司 | Permanent ferrite magnetic shoe wet pressing molding mould |
| JP6011350B2 (en) * | 2013-01-15 | 2016-10-19 | Tdk株式会社 | Sintered magnet and preform before firing |
| CN103071792B (en) * | 2013-01-25 | 2016-08-03 | 无锡钻探工具厂有限公司 | A kind of curved plate forming mold of hard alloy |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58110019A (en) * | 1981-12-24 | 1983-06-30 | Hitachi Metals Ltd | Method and apparatus for manufacturing compound integral permanent magnet |
| JPS5961023A (en) * | 1982-09-29 | 1984-04-07 | Hitachi Metals Ltd | Manufacture of composite integrated permanent magnet |
| JPS5992513A (en) * | 1982-11-18 | 1984-05-28 | 松下電器産業株式会社 | Method of producing laminated ceramic condenser |
| JPS59100510A (en) * | 1982-11-30 | 1984-06-09 | 日本電気ホームエレクトロニクス株式会社 | Method of producing laminated ceramic condenser |
-
1984
- 1984-08-27 JP JP59176720A patent/JPH0612727B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008246526A (en) * | 2007-03-30 | 2008-10-16 | Tdk Corp | Powder molding equipment, molding die and permanent magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6154601A (en) | 1986-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |