JPH04308006A - Die for compacting - Google Patents
Die for compactingInfo
- Publication number
- JPH04308006A JPH04308006A JP7104591A JP7104591A JPH04308006A JP H04308006 A JPH04308006 A JP H04308006A JP 7104591 A JP7104591 A JP 7104591A JP 7104591 A JP7104591 A JP 7104591A JP H04308006 A JPH04308006 A JP H04308006A
- Authority
- JP
- Japan
- Prior art keywords
- lower punch
- die
- punch
- mold
- powder
- 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
- 239000000843 powder Substances 0.000 claims description 56
- 238000005056 compaction Methods 0.000 claims description 18
- 238000000465 moulding Methods 0.000 claims description 17
- 239000004020 conductor Substances 0.000 claims description 7
- 239000007858 starting material Substances 0.000 abstract 2
- 239000002994 raw material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、焼結部品、とりわけ、
ポット型インダクタのインナーコアの成形金型に関し、
特に、成形品のバリを無害箇所に生成し得る金型に関す
る。[Industrial Field of Application] The present invention relates to sintered parts, particularly
Regarding the mold for the inner core of pot-type inductors,
In particular, the present invention relates to a mold that can generate burrs on a molded product at harmless locations.
【０００２】0002
【従来の技術】ポット型インダクタンス素子即ちインダ
クタは、その性能と共に加工組立性が良好な特徴があり
、一般に図４に示す形のものが使用されている。2. Description of the Related Art A pot-type inductance element, ie, an inductor, is characterized by good performance and ease of processing and assembly, and the type shown in FIG. 4 is generally used.
【０００３】このポット型インダクタＬは鉄粉等磁性材
料で形成したアウタコア１７とインナーコア１８により
磁気回路を形成し、その中心路に導線１９をコイルに巻
いたコイルボビン２０を装着した形状に組み立ててある
。This pot-type inductor L is assembled into a shape in which a magnetic circuit is formed by an outer core 17 and an inner core 18 made of a magnetic material such as iron powder, and a coil bobbin 20 in which a conducting wire 19 is wound into a coil is attached to the center path of the magnetic circuit. be.
【０００４】即ち、図５の分解斜視図に示したように、
インナーコア１８は、中心部分に直立状の円柱部１８ｂ
を備える円盤部１８ａから成り、その円盤部１８ａの２
箇所には導線導出用の切欠き２１を形成してあり、コイ
ルボビン２０は、上下端に鍔部２０ａ，２０ｂを有する
円筒体２０ｃに導線２２を巻き、その導線２２の端末を
上端の鍔部２０ａの仕切りを施した切欠部２３より導出
させて形成してあり、このコイルボビン２０の中心孔２
４に前記インナーコア１８の円柱部１８ｂを挿入し、円
筒容器状のアウターコア１７に収納して構成している。That is, as shown in the exploded perspective view of FIG.
The inner core 18 has an upright cylindrical portion 18b at the center.
It consists of a disc part 18a having two parts of the disc part 18a.
A notch 21 for leading out the conductor is formed at the location, and the coil bobbin 20 winds the conductor 22 around a cylindrical body 20c having flanges 20a and 20b at the upper and lower ends, and connects the end of the conductor 22 to the upper flanges 20a. The central hole 2 of the coil bobbin 20 is formed by leading out from a notch 23 partitioned with
The cylindrical portion 18b of the inner core 18 is inserted into the outer core 17, which is shaped like a cylindrical container.
【０００５】このようなポット型インダクタＬのインナ
ーコア１８は鉄粉等磁性粉を圧粉成形してつくられるが
、この成形体は図６の斜視図に示した上パンチ２５とダ
イス２６と第１下パンチ２７と第２下パンチ２８とから
なる構成の圧粉成形用金型Ｂによってつくられている。The inner core 18 of such a pot-shaped inductor L is made by compacting magnetic powder such as iron powder, and this compact is formed by forming an upper punch 25, a die 26, and a third die 26 as shown in the perspective view of FIG. It is made by a powder molding mold B consisting of a first lower punch 27 and a second lower punch 28.
【０００６】即ち、この圧粉成形用金型Ｂの主体となる
ダイス２６には、成形しようとする前記インナーコア１
８の円盤部１８ａの外径に対応する内径の円孔２９と、
前記円盤部１８ａの切欠き２１の形状に対応する寸法で
且つ上下全高に亙って直径方向に形成した１対の突起条
２６ａとを組み合わせたキャビティを形成してある。That is, the die 26, which is the main body of the powder molding mold B, has the inner core 1 to be molded.
a circular hole 29 with an inner diameter corresponding to the outer diameter of the disk portion 18a of No. 8;
A cavity is formed by combining a pair of protrusions 26a that have dimensions corresponding to the shape of the notch 21 of the disk portion 18a and are formed in the diametrical direction over the entire upper and lower heights.
【０００７】上パンチ２５は前記ダイス２６のキャビテ
ィ内に摺動的に嵌入できるように、前記突起条２６ａの
形状に対応する形状の溝条３０を周面に１対に形設した
円柱体３１からなる。また、第１下パンチ２７は、前記
ダイス２６の円孔２９に対応する外径の円柱体３２に、
前記インナーコア１８の円柱部１８ｂに対応する径の中
心孔３３を貫設すると共に、前記ダイス２６の突起条２
６ａに対応する形状の溝条３４を該円柱体３２の全高に
亙って形成してある。さらにまた、第２下パンチ２８は
、前記第１下パンチ２７の中心孔３３に対応する径で長
い円柱体に形設してある。The upper punch 25 has a cylindrical body 31 having a pair of grooves 30 formed on its circumferential surface in a shape corresponding to the shape of the protrusion 26a so that the upper punch 25 can be slidably fitted into the cavity of the die 26. Consisting of Further, the first lower punch 27 has a cylindrical body 32 having an outer diameter corresponding to the circular hole 29 of the die 26.
A center hole 33 having a diameter corresponding to the cylindrical portion 18b of the inner core 18 is provided through the center hole 33, and a protrusion 2 of the die 26 is formed through the center hole 33.
A groove 34 having a shape corresponding to 6a is formed over the entire height of the cylindrical body 32. Furthermore, the second lower punch 28 is formed into a long cylindrical body with a diameter corresponding to the center hole 33 of the first lower punch 27.
【０００８】従って、この圧粉成形用金型Ｂによれば、
図７の断面図のように、ダイプレート３５、第１下パン
チホルダ３６及び第２下パンチホルダ３７にそれぞれ組
み付けたダイス２６、第１下パンチ２７及び第２下パン
チ２８とで形成されるキャビティ内に原料粉を充填し、
上パンチホルダ３８に組み付けた上パンチ２５を圧入す
ることにより、ダイス２６内に圧粉成形体３９が形成さ
れるので、これを抜き出すことにより、前記のようなイ
ンナーコア１８が得られる。[0008] Therefore, according to this compacting mold B,
As shown in the cross-sectional view of FIG. 7, a cavity is formed by the die 26, the first lower punch 27, and the second lower punch 28 assembled to the die plate 35, the first lower punch holder 36, and the second lower punch holder 37, respectively. Fill the inside with raw material powder,
By press-fitting the upper punch 25 assembled into the upper punch holder 38, a powder compact 39 is formed in the die 26, and by extracting this, the inner core 18 as described above is obtained.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、前記の
圧粉成形用金型Ｂにおいては、インナーコア１８の円柱
部１８ｂは、ダイス２６のキャビティ内に全高に亙って
形設した突起条２６ａと、この突起条２６ａに対して溝
条３４で嵌合的に摺接する第１下パンチ２７の中心孔３
３とで形成されるので、その円柱部１８ｂには、長さ方
向に４本の型分割線が位置することになる。この型分割
線部分を構成するダイス２６の突起条２６ａの角部と第
１下パンチ２７の内側角部は摩耗し易く、図８の（ａ）
及び（ｂ）に示すように、型分割線に沿って線状にバリ
４０を生じ易い。また、このバリ４０は金型の摩耗度に
従って高い突起状をなすようになる。[Problems to be Solved by the Invention] However, in the powder compacting mold B, the cylindrical portion 18b of the inner core 18 has a protrusion 26a formed over the entire height within the cavity of the die 26. , the center hole 3 of the first lower punch 27 fits and slides into contact with the protrusion 26a through the groove 34.
3, so four mold dividing lines are located in the length direction of the columnar portion 18b. The corner of the protruding strip 26a of the die 26 and the inner corner of the first lower punch 27, which constitute this mold parting line portion, are easily worn out, as shown in FIG. 8(a).
As shown in (b), burrs 40 tend to form linearly along the mold parting line. Further, the burr 40 becomes highly protruding as the degree of wear of the mold increases.
【００１０】このようなバリを生成したインナーコアは
、組立の際にコイルボビンに挿入するとき、コイルボビ
ンの縁でバリを削られることになり、この削り取られた
バリがコイルボビンの導線に付着するとインダクタコア
と導線間の耐電圧特性を著しく低下させることになる。
また、型摩耗がさらに進むと、突起状のバリによりイン
ナーコアのコイルボビンに対する挿入が困難になる等、
作業性が著しく阻害される事態を生じる。When the inner core with such burrs is inserted into the coil bobbin during assembly, the burrs will be scraped off by the edge of the coil bobbin, and if the scraped burrs adhere to the conductor wire of the coil bobbin, the inductor core will be damaged. This will significantly reduce the withstand voltage characteristics between the conductor and the conductor. Additionally, as mold wear progresses, protruding burrs may make it difficult to insert the inner core into the coil bobbin.
This results in a situation where work efficiency is significantly hindered.
【００１１】圧粉成形後の成形品のバリ取りを行うこと
については、成形品の強度が小さいので、機械力による
破損が多く、歩留りを悪くすることになる。またバリ取
りを行った後の成形品は強度が低くなり、後工程での取
扱いが難しくなるという問題がある。[0011] Regarding deburring of the molded product after compaction, since the strength of the molded product is low, it is often damaged by mechanical force, resulting in poor yield. Further, there is a problem in that the strength of the molded product after deburring is reduced, making it difficult to handle in subsequent steps.
【００１２】この型摩耗による突起状バリの生成に対処
して、このインナーコアを組み込むコイルボビンの中心
孔を大きくする手段もとられているが、この場合にはイ
ンダクタ特性を低下させるという問題がある。In order to cope with the formation of protruding burrs due to mold wear, measures have been taken to enlarge the center hole of the coil bobbin into which the inner core is installed, but in this case there is a problem of deterioration of the inductor characteristics. .
【００１３】[0013]
【課題を解決するための手段】以上の状況に鑑み、本発
明は、ポット型インダクタ用インナーコア等、中心に円
柱部を有する焼結部品の円柱部に型分割線がなく、従っ
て、該円柱部にバリが生成する恐れのない焼結部品用成
形品の成形用金型の提供を目的とするものである。[Means for Solving the Problems] In view of the above circumstances, the present invention provides a sintered part having a cylindrical part at the center, such as an inner core for a pot-type inductor, which has no mold parting line in the cylindrical part, and therefore, the cylindrical part The object of the present invention is to provide a mold for forming a molded product for a sintered part without the risk of forming burrs on the part.
【００１４】この目的を達成するため、本発明は、切欠
きを有する円盤部の中心に円柱部を直立した焼結部品、
特には、ポット型インダクタのインナーコアを成形する
圧粉成形用金型であって、前記円盤部の外径に対応する
内径の円孔を貫設するダイスと、前記円柱部の外径に対
応する内径の中心孔を貫設し且つ先端平頂面上に前記切
欠きに対応する凸部を突設すると共に前記ダイスの円孔
内を摺動可能にした円筒状の第１下パンチと、該第１下
パンチの中心孔内を摺動可能にした小径円柱状の第２下
パンチと、前記ダイスの円孔内を前記第１下パンチと対
向的に摺動可能で且つ該第１下パンチの凸部に摺接可能
な溝条を側部に形成した円柱状の上パンチとからなる圧
粉成形用金型を提案するものである。[0014] In order to achieve this object, the present invention provides a sintered part having a cylindrical part upright in the center of a disc part having a notch;
In particular, it is a compaction mold for molding the inner core of a pot-shaped inductor, and includes a die through which a circular hole is formed with an inner diameter corresponding to the outer diameter of the disk portion, and a die corresponding to the outer diameter of the cylindrical portion. a cylindrical first lower punch that has a central hole with an inner diameter that extends through it, a protrusion that corresponds to the notch on the flat top surface of the tip, and is slidable within the circular hole of the die; a second lower punch having a small diameter cylindrical shape that is slidable in the center hole of the first lower punch; and a second lower punch that is slidable in the circular hole of the die opposite to the first lower punch; The present invention proposes a powder molding die that includes a cylindrical upper punch having grooves formed on the sides that can slide into convex portions of the punch.
【００１５】[0015]
【作用】前記のように構成した本発明においては、図３
によって説明すると、その（ａ）に示すように、ダイス
１の円孔２内に下方から第１下パンチ４を所定位置まで
嵌入して、その平頂面の凸部４ｂをダイス１表面上に露
呈する状態とし、次いで第２下パンチ５を下方から第１
下パンチ４の中心孔７に所定位置まで嵌入した後、ダイ
ス１内に形成されるキャビティに原料粉１６を充填し、
プレスの上ラム１１により上パンチ３を降下させる。[Operation] In the present invention configured as described above, FIG.
To explain this, as shown in (a), the first lower punch 4 is inserted into the circular hole 2 of the die 1 from below to a predetermined position, and the convex portion 4b of the flat top surface is placed on the surface of the die 1. Then, the second lower punch 5 is inserted into the first punch from below.
After fitting into the center hole 7 of the lower punch 4 to a predetermined position, the cavity formed in the die 1 is filled with raw material powder 16,
The upper punch 3 is lowered by the upper ram 11 of the press.
【００１６】上パンチ３はその側部の溝条９を前記第１
下パンチ４の凸部４ｂ側面に摺接する状態で原料粉１６
を圧縮して、図３の（ｂ）に示すように、圧粉成形体１
６′を形成する。The upper punch 3 has grooves 9 on the side thereof aligned with the first grooves 9.
The raw material powder 16 is in sliding contact with the side surface of the convex portion 4b of the lower punch 4.
is compressed to form a powder compact 1 as shown in FIG. 3(b).
6' is formed.
【００１７】次いでこの圧粉成形体１６′は、図３の（
ｃ）に示すように、上パンチ３を上昇させて離間させる
と共に、下ラム１５により第２下パンチ５を上昇させる
ことにより、圧粉成形体１６′を上方に押し上げ、ダイ
ス１から抜き出すことができる。Next, this powder compact 16' is shown in FIG.
As shown in c), by raising and separating the upper punch 3 and raising the second lower punch 5 by the lower ram 15, the powder compact 16' can be pushed upward and extracted from the die 1. can.
【００１８】この構成の圧粉成形用金型によれば、圧粉
成形時、型分割線はインナーコア上部の円盤部の外縁に
位置して圧粉成形体１６′の円柱部１６′ａ部分には位
置されず、該円柱部のキャビティは第１下パンチ４の内
周面のみによって構成されるから、圧粉成形後の円柱部
１６′ａには従来の圧粉成形用金型の場合のように、型
分割線による縦方向のバリは生成しない。According to the powder molding mold having this configuration, during powder compacting, the mold parting line is located at the outer edge of the disk portion at the upper part of the inner core, and the parting line is located at the outer edge of the disk portion at the upper part of the inner core, and the part of the cylindrical portion 16'a of the powder compact 16' is Since the cavity of the cylindrical part is formed only by the inner circumferential surface of the first lower punch 4, the cylindrical part 16'a after powder compaction is not located in the conventional powder compacting mold. Vertical burrs are not generated due to the mold parting lines, as in
【００１９】以下、図面により、本発明の実施例につい
て説明する。図１はポット型インダクタのインナーコア
成形に用いる本発明の圧粉成形用金型の構成を示す斜視
図で、図２は図１の圧粉成形用金型による圧粉成形体を
、下方からみた斜視図で、図３は図１の圧粉成形用金型
による圧粉成形行程を示す断面図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the configuration of a powder molding mold of the present invention used for molding the inner core of a pot-type inductor, and FIG. 2 shows a powder compact formed by the powder molding mold of FIG. 1 from below. FIG. 3 is a cross-sectional view showing a powder compaction process using the powder compaction mold of FIG. 1.
【００２０】本発明の圧粉成形用金型Ａは、図１に示し
たように、前記した従来の圧粉成形用金型Ｂの場合と同
様に、ダイス１とこのダイス１の円孔２に上下方向から
挿入されて、ダイス１内にインナーコア形状のキャビテ
ィを構成する上パンチ３と第１下パンチ４と第２下パン
チ５とから成る。As shown in FIG. 1, the compacting mold A of the present invention has a die 1 and a circular hole 2 of the die 1, as in the case of the conventional powder compacting die B described above. It consists of an upper punch 3, a first lower punch 4, and a second lower punch 5, which are inserted from above and below into the die 1 to form an inner core-shaped cavity.
【００２１】本圧粉成形用金型Ａの主体となるダイス１
は、図２に示したような成形しようとする圧粉成形体即
ちインナーコア６の円盤部６ａの外径に対応する内径で
キャビティを構成する円孔２を貫設し、その高さは、イ
ンナーコア６の全高よりも十分に大としてある。[0021]Dice 1 which is the main body of the present powder compacting mold A
As shown in FIG. 2, a circular hole 2 constituting a cavity is provided through the cavity with an inner diameter corresponding to the outer diameter of the disk portion 6a of the powder compact to be molded, that is, the inner core 6, and the height thereof is as follows. It is made sufficiently larger than the total height of the inner core 6.
【００２２】第１下パンチ４は、前記ダイス１の円孔２
内に嵌入して摺動し得る外径を有する円柱体に形成し、
その中心部には前記インナーコア６の円柱部６ｂの外径
に相当する中心孔７を貫設してある。The first lower punch 4 is inserted into the circular hole 2 of the die 1.
Formed into a cylindrical body having an outer diameter that can be inserted into and slid,
A center hole 7 corresponding to the outer diameter of the cylindrical portion 6b of the inner core 6 is provided through the center thereof.
【００２３】そして、この第１下パンチ４の上面は平頂
面４ａに形成し、その平頂面４ａに、中心孔７の開口を
狭んで直径方向に１対に板状体を立設した形の凸部４ｂ
を突設してある。この凸部４ｂは、圧粉成形時、前記イ
ンナーコア６の円盤部６ａの切欠き８を形成させるため
のもので、その形状は前記切欠き８の形状とネガティブ
な関係にある。The upper surface of the first lower punch 4 is formed into a flat top surface 4a, and a pair of plate-like bodies are erected in the diameter direction on the flat top surface 4a by narrowing the opening of the center hole 7. shaped convex portion 4b
is installed protrudingly. This convex portion 4b is for forming a notch 8 in the disc portion 6a of the inner core 6 during powder compacting, and its shape has a negative relationship with the shape of the notch 8.
【００２４】この第１下パンチ４の全高は、ダイス１の
全高より十分に大とし、凸部４ｂの高さもまた、インナ
ーコア６の円盤部６ａの厚さよりも大となるようにして
ある。The total height of the first lower punch 4 is made sufficiently larger than the total height of the die 1, and the height of the convex portion 4b is also made larger than the thickness of the disk portion 6a of the inner core 6.
【００２５】第２下パンチ５は、前記第１下パンチ４の
中心孔７に嵌合して摺動可能な外径をもつ円柱体に形成
され、第１下パンチ４の全高と略同等またはそれ以上の
高さを有するようにしてある。The second lower punch 5 is formed into a cylindrical body with an outer diameter that can fit and slide in the center hole 7 of the first lower punch 4, and has a height that is approximately equal to or equal to the total height of the first lower punch 4. It is designed to have a height greater than that.
【００２６】上パンチ３は、前記ダイス１に嵌入して摺
動可能な外径を有する円柱体に形成されると共に、前記
第１下パンチ４の凸部４ｂ側面に摺接できる１対の溝条
９を外周部に刻設している。The upper punch 3 is formed into a cylindrical body having an outer diameter that allows it to fit and slide on the die 1, and has a pair of grooves that can slide on the side surface of the convex portion 4b of the first lower punch 4. A strip 9 is carved on the outer periphery.
【００２７】次に、図３により、インナーコア６の成形
工程を説明する。上パンチ３は上パンチホルダ１０に取
り付けられ、プレスの上ラム１１によって上下動し、ダ
イス１はダイプレート１２に取り付けられ、第１下パン
チ４は第１下パンチホルダ１３に取り付けられると共に
第２下パンチ５は第２下パンチホルダ１４を介して下ラ
ム１５によって上下動するようにしてある。Next, the process of forming the inner core 6 will be explained with reference to FIG. The upper punch 3 is attached to the upper punch holder 10 and is moved up and down by the upper ram 11 of the press, the die 1 is attached to the die plate 12, the first lower punch 4 is attached to the first lower punch holder 13, and the second The lower punch 5 is moved up and down by a lower ram 15 via a second lower punch holder 14.
【００２８】図３の（ａ）は、圧粉開始時を示し、ダイ
ス１に対し、第１下パンチ４が下方から所定高さ位置ま
で嵌入され、その凸部４ｂがダイス１の上表面より突出
状態に位置されており、また、第２下パンチ５が下から
所定の高さ位置まで第１下パンチ４の中心孔７内に嵌入
されている。FIG. 3A shows the start of powder compaction, in which the first lower punch 4 is inserted into the die 1 from below to a predetermined height position, and its convex portion 4b is lower than the upper surface of the die 1. The second lower punch 5 is inserted into the center hole 7 of the first lower punch 4 from below to a predetermined height position.
【００２９】そして、このダイス１と第１下パンチ４と
第２下パンチ５で構成されるインナーコア用キャビティ
に成形用原料粉１６をダイス１の略上表面まで平らに充
填した後、上ラム１１を作動させ、上パンチ３を下動さ
せて圧粉が開始される。After filling the molding raw material powder 16 flatly into the inner core cavity constituted by the die 1, the first lower punch 4, and the second lower punch 5 up to almost the upper surface of the die 1, the upper ram 11 is activated, the upper punch 3 is moved downward, and powder compaction is started.
【００３０】図３の（ｂ）は、圧粉終了時を示し、上パ
ンチ３が下動して、溝条９に第１下パンチ４の凸部４ｂ
を摺接させ、充填された原料粉１６を圧縮しながらダイ
ス１内に一定高さ位置まで圧入することによって原料粉
１６の圧粉成形が終了する。FIG. 3(b) shows the end of powder compaction, when the upper punch 3 moves downward and the convex portion 4b of the first lower punch 4 is attached to the groove 9.
The powder compaction of the raw material powder 16 is completed by bringing the raw material powder 16 into sliding contact and press-fitting the filled raw material powder 16 into the die 1 to a certain height while compressing it.
【００３１】図３の（ｃ）は圧粉成形体１６′（インナ
−コア６）の抜出時を示し、ダイプレート１２を固定し
、第２下パンチ５を下ラム１５によって上動させること
により、第２下パンチ５は圧粉成形体１６′をダイス１
の上表面上に押し出すので、これにより、容易に図２に
示すようなインナーコア６を得ることができる。FIG. 3(c) shows the state in which the compacted compact 16' (inner core 6) is extracted, in which the die plate 12 is fixed and the second lower punch 5 is moved upward by the lower ram 15. Accordingly, the second lower punch 5 inserts the powder compact 16' into the die 1.
Since the inner core 6 is extruded onto the upper surface of the inner core 6 as shown in FIG. 2, it is easy to obtain the inner core 6 as shown in FIG.
【００３２】このインナーコア６は、その成形時、円柱
部６ｂ部分には型分割線がなく、第１下パンチ４の内周
面のみによって成形されるので、円柱部６ｂの周面には
バリが生成しない。During molding, this inner core 6 has no mold parting line in the cylindrical portion 6b and is molded only by the inner circumferential surface of the first lower punch 4, so there is no burr on the circumferential surface of the cylindrical portion 6b. is not generated.
【００３３】以上に説明した本発明の圧粉成形用金型Ａ
を用いて、電解鉄粉（東邦亜鉛（株）製ＰＭ−２５０）
１５０ｋｇ、バインダ３．０ｋｇ及びステアリン酸亜鉛
２．３ｋｇの混合粉末からなる原料粉により、インナー
コア６の圧粉成形を行った。[0033] The compacting mold A of the present invention explained above
Electrolytic iron powder (PM-250 manufactured by Toho Zinc Co., Ltd.)
The inner core 6 was compacted using a raw material powder consisting of a mixed powder of 150 kg, 3.0 kg of binder, and 2.3 kg of zinc stearate.
【００３４】１，０００個、２５，０００個、５０，０
００個、７５，０００個及び１００，０００個毎に成形
体を抽出し、その円柱部６ｂの外径ｒ１ （図２参照）
を測定し、その結果を表１に示した。1,000 pieces, 25,000 pieces, 50,0
00 pieces, 75,000 pieces, and 100,000 pieces are extracted, and the outer diameter r1 of the cylindrical part 6b is determined (see Fig. 2).
was measured, and the results are shown in Table 1.
【００３５】なお、圧粉成形用金型は鍛造型鋼（富士ダ
イス（株）製ＫＦ２合金鋼）によって製作し、これによ
るインナーコア６の標準寸法は、円盤部６ａ径９．６９
ｍｍφ、円柱部６ｂ高さ８．３ｍｍ及び円柱部６ｂ径４
．２ｍｍφに設定した。The powder molding die is made of forged die steel (KF2 alloy steel manufactured by Fuji Dice Co., Ltd.), and the standard dimensions of the inner core 6 are as follows: the diameter of the disk portion 6a is 9.69 mm.
mmφ, cylindrical part 6b height 8.3mm and cylindrical part 6b diameter 4
．． It was set to 2 mmφ.
【００３６】また、前記の１，０００個、２５，０００
個、５０，０００個、７５，０００個及び１００，００
０個毎に２０個宛計１００個の成形体を抽出し、ポット
型インダクタを組立て、印加電圧を変え、限界電流２ｍ
Ａを越えるものを検出する方法により耐電圧特性を測
定した。その結果を表２に示した。[0036] Also, the above 1,000 pieces, 25,000 pieces
pieces, 50,000 pieces, 75,000 pieces and 100,00 pieces
Extract a total of 100 molded bodies (20 for each 0), assemble a pot-shaped inductor, change the applied voltage, and set a limit current of 2m.
The withstand voltage characteristics were measured by a method of detecting those exceeding A. The results are shown in Table 2.
【００３７】さらに、比較例として、図６に示した従来
構成の圧粉成形金型Ｂを用い、他は同じ条件として、前
記の実施例と同様に成形体の円柱部の外径測定を行った
。ただし、この場合、図８の（ｂ）に示したように、型
分割線に抵触しない位置での外径ｒ２ と、型分割線上
の位置での外径ｒ２ ′を測定し、結果を表１に併記し
た。Furthermore, as a comparative example, the outer diameter of the cylindrical part of the molded body was measured in the same manner as in the previous example, using the powder molding mold B of the conventional configuration shown in FIG. 6 and under the same conditions as above. Ta. However, in this case, as shown in FIG. 8(b), the outer diameter r2 at a position that does not conflict with the mold parting line and the outer diameter r2' at a position on the mold parting line are measured, and the results are shown in Table 1. Also listed.
【００３８】また、実施例と同じ条件のもとに、従来金
型構成による成形体を用いてポット型インダクタを組み
立て、限界電流２ｍ Ａの耐電圧特性の測定を行い、そ
の結果を表２に併記した。In addition, under the same conditions as in the example, a pot-shaped inductor was assembled using a molded product with a conventional mold configuration, and the withstand voltage characteristics at a limiting current of 2 mA were measured. The results are shown in Table 2. Also listed.
【００３９】[0039]
【表１】[Table 1]
【００４０】[0040]
【表２】[Table 2]
【００４１】表１及び表２の結果から明らかなように、
本発明の圧粉成形用金型Ａによるインナーコアは、バリ
がなく、円柱部の径も極めて安定しており、このインナ
ーコアを用いたポット型インダクタは耐電圧値が高く、
バラツキも少ない。As is clear from the results in Tables 1 and 2,
The inner core produced by the compacting mold A of the present invention has no burrs and the diameter of the cylindrical part is extremely stable, and a pot-type inductor using this inner core has a high withstand voltage value.
There is little variation.
【００４２】また、従来構成の圧粉成形用金型Ｂによる
インナーコアは、型分割線による影響を受け、生産の進
行に伴いバリ乃至突起条の成長がみられ、このインナー
コアを用いたポット型インダクタは耐電圧値が比較的低
く、バラツキも大きいという状況であった。In addition, the inner core produced by the compacting mold B of the conventional configuration was affected by the mold parting line, and as production progressed, growth of burrs or protrusions was observed, and pots using this inner core Type inductors have a relatively low withstand voltage value and have large variations.
【００４３】[0043]
【発明の効果】以上の説明から明らかなように、本発明
の圧粉成形用金型によれば、圧粉成形される焼結部品用
成形品の円柱部に型分割線に基づくバリ乃至突起条を生
成することがない。特に、この圧粉成形用金型によって
成形されるポット型インダクタのインナーコアの場合、
ポット型インダクタの組立作業におけるコイルボビンへ
のインナーコアの組み込み作業が能率的に安定して行わ
れると共に、バリ乃至突起条による耐電圧特性の低下や
バラツキがなくなる等性能の安定したインダクタが得ら
れるという効果を奏する。Effects of the Invention As is clear from the above description, according to the powder molding mold of the present invention, burrs or protrusions based on the mold parting line are formed on the cylindrical part of the molded product for sintered parts to be powder molded. No articles are generated. In particular, in the case of the inner core of a pot-shaped inductor that is molded using this compacting mold,
It is said that the work of assembling the inner core into the coil bobbin during pot-type inductor assembly work can be carried out efficiently and stably, and that an inductor with stable performance can be obtained, with no deterioration or variation in withstand voltage characteristics caused by burrs or protrusions. be effective.
【図１】ポット型インダクタのインナーコアの成形に用
いる本発明の圧粉成形用金型の構成を示す斜視図である
。FIG. 1 is a perspective view showing the configuration of a powder compacting mold of the present invention used for molding an inner core of a pot-shaped inductor.
【図２】図１の圧粉成形用金型による圧粉成形体を下方
からみた斜視図である。FIG. 2 is a perspective view of a powder compact formed by the powder compacting die of FIG. 1, viewed from below.
【図３】図１の圧粉成形用金型による圧粉成形工程を示
す断面図で、（ａ）は圧粉開始時、（ｂ）は圧粉終了時
で、（ｃ）は製品抜出時を示す。[Fig. 3] Cross-sectional views showing the powder compaction process using the powder compaction mold in Fig. 1, (a) at the start of powder compaction, (b) at the end of powder compaction, and (c) when the product is removed. Show the time.
【図４】ポット型インダクタの断面図である。FIG. 4 is a cross-sectional view of a pot-type inductor.
【図５】図４のポット型インダクタの分解斜視図である
。5 is an exploded perspective view of the pot-type inductor of FIG. 4. FIG.
【図６】図５におけるインナーコアの成形に用いる従来
の圧粉成形用金型の構成を示す斜視図である。6 is a perspective view showing the configuration of a conventional powder molding die used for molding the inner core in FIG. 5. FIG.
【図７】図６の圧粉成形用金型による圧粉成形状態を示
す断面図である。7 is a sectional view showing a state of powder compaction using the powder compaction mold of FIG. 6; FIG.
【図８】図６の圧粉成形用金型による圧粉成形体の図で
、（ａ）は正面図で、（ｂ）は下からみた平面図である
。8A and 8B are diagrams of a powder compact formed by the powder compaction mold of FIG. 6, in which (a) is a front view and (b) is a plan view seen from below.
Ａ…圧粉成形用金型 Ｌ…ポット型インダクタ １…ダイス ２…円孔 ３…上パンチ ４…第１下パンチ ４ａ…平頂面 ４ｂ…凸部 ５…第２下パンチ ６…インナーコア ６ａ…円盤部 ６ｂ…円柱部 ７…中心孔 ８…切欠き ９…溝条 A...Mold for powder compaction L...Pot type inductor 1...Dice 2...Circular hole 3...Top punch 4...First lower punch 4a...Flat top surface 4b...Protrusion 5...Second lower punch 6...Inner core 6a...disc part 6b...Cylindrical part 7...Center hole 8...Notch 9... Groove
Claims (2)
を立設した形状の焼結部品の圧粉成形用金型であって、
前記円盤部の外径に対応する内径の円孔を貫設するダイ
スと、前記円柱部の外径に対応する内径の中心孔を貫設
し且つ先端平頂面上に前記切欠きに対応する凸部を突設
すると共に前記ダイスの円孔内を摺動可能にした略円筒
状の第１下パンチと、該第１下パンチの中心孔内を摺動
可能にした小径円柱状の第２下パンチと、前記ダイスの
円孔内を前記第１下パンチと対向的に摺動可能で且つ前
記第１下パンチの凸部に摺接可能な溝条を側部に形成し
た円柱状の上パンチとから成ることを特徴とする圧粉成
形用金型。1. A mold for compacting a sintered part having a shape in which a cylindrical part is erected at the center of a disc part having a notch, the mold comprising:
A die having a circular hole having an inner diameter corresponding to the outer diameter of the disk portion and a center hole having an inner diameter corresponding to the outer diameter of the cylindrical portion and having a flat top surface at the tip thereof corresponding to the notch. a first lower punch having a substantially cylindrical shape having a projecting protrusion and capable of sliding within a circular hole of the die; and a second lower punch having a small diameter cylindrical shape capable of sliding within a center hole of the first lower punch. a lower punch; and a cylindrical upper punch having grooves formed on its sides that can slide in the circular hole of the die opposite to the first lower punch and can come into sliding contact with the convex portion of the first lower punch. A powder compacting mold characterized by comprising a punch.
中心に円柱部を立設したポット型インダクタのインナー
コアを形成する圧粉成形用金型であって、前記円盤部の
外径に対応する内径の円孔を貫設するダイスと、前記円
柱部の外径に対応する内径の中心孔を貫設し且つ先端平
頂面上に前記切欠きに対応する凸部を突設すると共に前
記ダイスの円孔内を摺動可能にした略円筒状の第１下パ
ンチと、該第１下パンチの中心孔内を摺動可能にした小
径円柱状の第２下パンチと、前記ダイスの円孔内を前記
第１下パンチと対向的に摺動可能で且つ前記第１下パン
チの凸部に摺接可能な溝条を側部に形成した円柱状の上
パンチとから成ることを特徴とする圧粉成形用金型。2. A powder molding mold for forming an inner core of a pot-shaped inductor, which has a cylindrical part erected at the center of a disc part having a notch for leading out a conductor, wherein the outer diameter of the disc part is A die having a circular hole having a corresponding inner diameter formed therethrough, a center hole having an inner diameter corresponding to the outer diameter of the cylindrical portion being formed therethrough, and a convex portion corresponding to the notch protrudingly provided on the flat top surface of the tip; a first lower punch having a substantially cylindrical shape that is slidable within a circular hole of the die; a second lower punch having a small diameter cylindrical shape that is slidable within a center hole of the first lower punch; A cylindrical upper punch that is capable of sliding in a circular hole opposite to the first lower punch and has a groove formed on the side thereof that can be slid into contact with a convex portion of the first lower punch. A mold for powder compaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3071045A JP3013202B2 (en) | 1991-04-03 | 1991-04-03 | Mold for compacting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3071045A JP3013202B2 (en) | 1991-04-03 | 1991-04-03 | Mold for compacting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04308006A true JPH04308006A (en) | 1992-10-30 |
| JP3013202B2 JP3013202B2 (en) | 2000-02-28 |
Family
ID=13449161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3071045A Expired - Fee Related JP3013202B2 (en) | 1991-04-03 | 1991-04-03 | Mold for compacting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3013202B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014513436A (en) * | 2011-05-05 | 2014-05-29 | ホガナス アクチボラグ （パブル） | Induction iron core, compression device, and manufacturing method |
| JP2019012796A (en) * | 2017-06-30 | 2019-01-24 | トヨタ自動車株式会社 | Method of producing rare earth magnet |
-
1991
- 1991-04-03 JP JP3071045A patent/JP3013202B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014513436A (en) * | 2011-05-05 | 2014-05-29 | ホガナス アクチボラグ （パブル） | Induction iron core, compression device, and manufacturing method |
| JP2019012796A (en) * | 2017-06-30 | 2019-01-24 | トヨタ自動車株式会社 | Method of producing rare earth magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3013202B2 (en) | 2000-02-28 |
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