JP2004244708A - Apparatus and method for charging magnetic powder - Google Patents

Apparatus and method for charging magnetic powder Download PDF

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JP2004244708A
JP2004244708A JP2003038101A JP2003038101A JP2004244708A JP 2004244708 A JP2004244708 A JP 2004244708A JP 2003038101 A JP2003038101 A JP 2003038101A JP 2003038101 A JP2003038101 A JP 2003038101A JP 2004244708 A JP2004244708 A JP 2004244708A
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mold
magnetic powder
magnetic field
hole
punches
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JP3851281B2 (en
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Jinichi Furukawa
仁一 古川
Taizo Iwami
泰造 石見
Giichi Ukai
義一 鵜飼
Shuichi Takahama
修一 高浜
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for charging a magnetic powder, which reduces a difference in a packing density of the magnetic powder among the positions in a pressurized axis direction, and to provide a method for charging the magnetic powder. <P>SOLUTION: This charging apparatus comprises a magnetic forming die consisting of an upper die 1 and a lower die 2, a channel 2a formed in the lower die 2, which penetrates both end faces 2b of the lower die 2 and has a desired cross-sectional shape, a pair of movable punches 3a and 3b which are inserted from both ends of the lower die 2 and engaged to the channel 2a so as to form a cavity for accommodating a charged magnetic powder therein, permanent magnets 6a and 6b which produce a magnetic field so as to penetrate the channel 2a, a magnetic field-moving means 4 for moving a magnetic field with respect to the magnet-forming die by bidirectionally moving the permanent magnets 6a and 6b along the moving directions of a pair of the punches 3a and 3b, and a punch-moving means 5 for fixing any one of a pair of the punches 3a and 3b and moving the other punch toward the center of the channel 2a along the direction of moving the permanent magnets 6a and 6b. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、磁石成形金型のキャビティー内に、磁性粉末を圧縮加圧して高密度に充填する磁性粉充填装置及び磁性粉充填方法に関するものである。
【０００２】
【従来の技術】
磁性粉末の一般的な充填方法として、金型のキャビティー内に磁性粉を投入し、表面を擦り切る方法がある。
【０００３】
この際、キャビティー内に投入した磁性粉末間にはブリッジや空洞等があるために、充填密度に不均一が生じるという問題がある。
【０００４】
この問題を解決するために、キャビティー内の磁性粉を加圧する方向と垂直な方向の回転磁界を、磁性粉に与えることによってブリッジや空洞等をなくし、その後、パンチによりキャビティー内の磁性粉に圧縮力を加えて高密度に充填する装置及び方法が開示されている（例えば、特許文献１参照）。
【０００５】
【特許文献１】
特開平９−７８１０４号公報（第３頁−第４頁、図２、図３）
【０００６】
【発明が解決しようとする課題】
従来の磁性粉充填装置及び方法は、以上のように、キャビティー内の磁性粉を加圧する方向と垂直な方向の回転磁界を磁性粉に与えることによってブリッジや空洞等をなくしているので、ブリッジや空洞等による充填密度の不均一をなくすことができる。
【０００７】
しかしながら、パンチの圧縮力が、パンチ側近傍の磁性粉には十分伝達されるが、パンチから加圧軸方向において遠い位置にある磁性粉には十分伝達されず、その結果、パンチ側の密度が大きくなり、パンチ側近傍とパンチから遠い位置とで充填密度差が生じてしまうという問題がある。
【０００８】
この発明は上記のような問題を解消するためになされたもので、加圧軸方向における磁性粉の充填密度差を少なくすることができる磁性粉末充填装置及び磁性粉末充填方法の提供を目的とするものである。
【０００９】
【課題を解決するための手段】
この発明に係る磁性粉充填装置は、金型に形成されたキャビティーに磁性粉末を投入し、パンチによって上記磁性粉を圧縮加圧することにより上記金型のキャビティー内に上記磁性粉末を高密度充填する磁性粉充填装置において、
上記金型が、その両端面を貫通し、所望の幅、高さ及び断面形状の貫通孔を有し、
上記パンチは、幅、高さ及び断面形状が上記貫通孔の断面形状と略同一の一対のパンチからなり、上記金型の両端から上記一対のパンチを上記貫通孔に嵌合することによって上記キャビティーが形成され、
上記貫通孔を垂直に貫流する磁界を発生する磁界発生部と、
上記磁界発生部または上記金型のいずれか一方を、上記一対のパンチがなす方向へ双方向に移動させることにより、上記磁界を上記金型に対して相対移動させる磁界移動手段と、
上記一対のパンチのいずれか一方を固定し、他方を、上記磁界移動手段によって上記金型に対して相対移動する上記磁界の移動方向に合わせて上記貫通孔の中央側へ移動させるパンチ移動手段と、
を備えたものである。
【００１０】
【発明の実施の形態】
以下、この発明の実施の形態を図に基づいて説明する。
実施の形態１．
図１は、この発明の実施の形態１における磁性粉充填装置の構成を示すブロック図（ａ）及び磁石成形金型の下型と可動パンチの構成を示す斜視図（ｂ）である。
【００１１】
図１に示したように、磁石成形金型は、上型１と下型２と可動パンチ３ａ，３ｂからなり、下型２には、その両端面２ｂに至る所望の断面形状を有する溝２ａが形成されており、下型２に上型１を重ね合わせることにより貫通孔が形成される。
【００１２】
可動パンチ３ａ，３ｂは、溝２ａ（貫通孔）と同一形状を有し、可動パンチ３ａ，３ｂを貫通孔の両端に嵌合・挿入することによって、キャビティーが形成される。磁石成形金型を上型１と下型２とで構成し、下型２に溝２ａを形成することによって、キャビティー内に磁性粉を投入し易くすることができる。
【００１３】
上型１の上方及び下型２の下方には、溝２ａを挟むように磁界発生手段として永久磁石６ａ及び６ｂが配設され、永久磁石６ａ及び６ｂにより、溝２ａを貫流する磁界が発生する。永久磁石６ａ及び６ｂの幅は、溝２ａの幅以上とし、永久磁石６ａ及び６ｂが発生する磁界幅は溝２ａの幅以上にすることにより、溝２ａの幅方向における磁性粉１０の分布を均一にすることができる。
【００１４】
永久磁石６ａ及び６ｂは、磁界移動手段４によって可動パンチ３ａ，３ｂがなす双方向に移動し、可動パンチ３ａ，３ｂは、パンチ移動手段５によって、一方が固定され、他方が溝２ａの中央側に向かって、永久磁石６ａ及び６ｂの移動方向と同じ方向へ移動するように構成されている。
【００１５】
図２は、磁石成形金型のキャビティー内に磁性粉を投入した時の磁性粉の状態（ａ）と、永久磁石６ａ及び６ｂにより、磁界を発生させた時の磁性粉の状態（ｂ）を模式的に示す断面図である。
【００１６】
図２（ａ）に示したように、予め計量した磁性粉をキャビティー内に投入すると、投入した時の磁性粉１０は、溝２ａに沿った山形に分布し、内部に空洞１１が存在する。この状態に対して永久磁石６ａ及び６ｂにより磁界を発生させた時には、図２（ｂ）に示したように、磁性粉１０は溝２ａに沿ってほぼ均一に分布し、空洞１１がなくなる。
【００１７】
図３は、図２（ｂ）の状態から磁性粉１０を高密度に充填する工程を説明する断面図である。
【００１８】
まず、図３（ａ）に示したように、永久磁石６ａ，６ｂを、固定した一方の可動パンチ３ｂ側へ移動させるとともに、他方の可動パンチ３ａを溝２ａの中央側へ移動させる。この移動動作によって、磁性粉１０が永久磁石６ａ，６ｂの磁界とともに一方の可動パンチ３ｂ側に移動して可動パンチ３ｂに当接し、他方の可動パンチ３ａの移動によってキャビティーの体積が減少する。
【００１９】
次に、図３（ｂ）に示したように、永久磁石６ａ，６ｂを、固定した一方の可動パンチ３ａ側へ移動させるとともに、他方の可動パンチ３ｂを溝２ａの中央側へ移動させる。この移動動作によって、磁性粉１０が一方の可動パンチ３ａ側に移動して可動パンチ３ａに当接し、他方の可動パンチ３ｂの移動によって、さらに、キャビティーの体積が減少し、粗密度部７の体積が減少する。
【００２０】
さらに、図３（ｃ）に示したように、図３（ａ）と図３（ｂ）に示した動作を繰り返し、可動パンチ３ａ，３ｂの移動量が設定した移動量になるとリミッターが作動して可動パンチ３ａ，３ｂは停止し、高密度充填が終了する。
【００２１】
最終充填密度は１．４〜２．０ｇ／ｃｍ３とするのが望ましい。すなわち、１．４ｇ／ｃｍ３よりも小さいと粗密度部７が残り、均一な充填がされず、２．０ｇ／ｃｍ３を越えると、この高密度充填の後工程における磁場成形において、配向率が低下し、磁気特性が低下する。
【００２２】
可動パンチ３ａ，３ｂの移動量は、計量した磁性粉の量と最終充填密度から求め、設定される。
【００２３】
キャビティー内の磁束密度は、溝２ａの断面の形状及び面積によって変化するが、２０ｍＴ〜１００ｍＴ、好ましくは２５ｍＴ〜４０ｍＴになるように、磁石成形金型と永久磁石６ａ，６ｂとの距離を調整する。
【００２４】
以上のように、この実施の形態においては、永久磁石６ａ，６ｂによって溝（キャビティー）２ａを貫流する磁界を発生させるとともに、永久磁石６ａ，６ｂを一対のパンチ３ａ，３ｂがなす双方向の一方へ移動させる動作と、一対のパンチ３ａ，３ｂのいずれか一方を固定し、他方を、永久磁石６ａ，６ｂの移動方向に合わせてキャビティー２ａの中央側に移動させる動作とを繰り返すことによって磁性粉１０の可動パンチ３ａ，３ｂ方向における充填密度を均一にしつつ、高密度に充填することができる。
【００２５】
この実施の形態は、例えば、合金粉砕、成形、焼結の工程を経るネオジ焼結磁石の製造の成形工程に適用され、充填密度の均一化が図られ、その結果、焼結歪が低減されることが確認されている。
【００２６】
実施の形態２．
図４は、この発明の実施の形態２を示す断面図であり、図１及び図２と同一符号は同一部分または相当部分を示している。
【００２７】
上記実施の形態１では、磁石成形金型の上下に、溝２ａを挟むように永久磁石６ａ，６ｂからなる磁界発生部を配設したが、図４に示したように、永久磁石６ｂに代えて、永久磁石６ａと磁性体８との組合せとしてもよい。
【００２８】
実施の形態３．
図５は、この発明の実施の形態３を示す平面図であり、図１と同一符号は同一部分または相当部分を示している。
【００２９】
上記実施の形態１では、磁石成形金型の上下に、溝２ａを挟むように永久磁石６ａ，６ｂからなる磁界発生部を配設したが、図４に示したように、永久磁石６ａ，６ｂに代えて、電磁コイルまたは電磁石９を配設してもよい。電磁コイルまたは電磁石９が発生する磁界幅は溝２ａの幅以上とすることによって、溝２ａの幅方向における磁性粉の分布を均一にすることができる。
【００３０】
実施の形態４．
図６は、この発明の実施の形態４を示す平面図であり、図１と同一符号は同一部分または相当部分を示している。
【００３１】
この実施の形態においては、図６に示したように、図５と同様の複数個の電磁コイルまたは電磁石９ａ，９ｂ，９ｃを溝２ａに沿って配設し、電磁コイルまたは電磁石９ａ，９ｂ，９ｃに流す電流を順次切り換えることにより、磁界を移動させる磁界移動手段としている。
【００３２】
実施の形態５．
図７は、この発明の実施の形態５を示す平面図であり、図１と同一符号は同一部分または相当部分を示している。
【００３３】
上記実施の形態１ないし４のように、磁界発生幅を溝の幅以上とした場合は、溝に沿って永久磁石等の磁界発生部を移動させればよいが、永久磁石等の磁界発生部の大きさを大きくできない場合には、図７に示したように、永久磁石６等の磁界発生部を、可動パンチ３ａ，３ｂの方向を長軸とした楕円形の軌跡で移動させることにより、磁性粉を均一に充填できる。
【００３４】
なお、上記実施の形態１ないし５では、磁石成形金型を構成する上型１及び下型２を固定し、永久磁石６ａ，６ｂ、電磁コイルまたは電磁石９，９ａ，９ｂ，９ｃ等の磁界発生部を可動パンチ３ａ，３ｂのなす方向に移動するようにしたが、磁界発生部を固定し、磁石成形金型を移動させ、磁石成形金型に対して相対的に磁界が移動するようにし、可動パンチ３ａ，３ｂの一方を固定し、他方を、磁石成形金型に対する磁界の相対移動方向に、かつ、磁石成形金型の溝２ａ中央側へ移動するようにしてもよい。
【００３５】
また、磁石成形金型を上型１と下型２で構成し、下型２に溝２ａを形成したが、上型１に下型２の溝２ａと連通する溝を形成してもよい。さらには、磁石成形金型を一体形のものとしてもよく、この場合、磁石成形金型は、両端面に至る所望の断面形状の貫通孔を設け、この貫通孔の両端から貫通孔の断面形状と同一の断面形状を有する一対の可動パンチを嵌合し移動させることができるようにすればよい。
【００３６】
【発明の効果】
この発明に係る磁性粉充填装置によれば、金型に形成されたキャビティーに磁性粉末を投入し、パンチによって上記磁性粉を圧縮加圧することにより上記金型のキャビティー内に上記磁性粉末を高密度充填する磁性粉充填装置において、
上記金型が、その両端面を貫通し、所望の幅、高さ及び断面形状の貫通孔を有し、
上記パンチは、幅、高さ及び断面形状が上記貫通孔の断面形状と略同一の一対のパンチからなり、上記金型の両端から上記一対のパンチを上記貫通孔に嵌合することによって上記キャビティーが形成され、
上記貫通孔を垂直に貫流する磁界を発生する磁界発生部と、
上記磁界発生部または上記金型のいずれか一方を、上記一対のパンチがなす方向へ双方向に移動させることにより、上記磁界を上記金型に対して相対移動させる磁界移動手段と、
上記一対のパンチのいずれか一方を固定し、他方を、上記磁界移動手段によって上記金型に対して相対移動する上記磁界の移動方向に合わせて上記貫通孔の中央側へ移動させるパンチ移動手段と、
を備えたものであるので、磁性粉の可動パンチ方向における充填密度を均一にしつつ、高密度に充填することができる。
【図面の簡単な説明】
【図１】この発明の実施の形態１における磁性粉充填装置の構成を示すブロック図（ａ）及び磁石成形金型の下型と可動パンチの構成を示す斜視図（ｂ）である。
【図２】磁石成形金型のキャビティー内に磁性粉を投入した時の磁性粉の状態（ａ）と、永久磁石により、磁界を発生させた時の磁性粉の状態（ｂ）を模式的に示す断面図である。
【図３】磁性粉を高密度に充填する工程を説明する断面図である。
【図４】この発明の実施の形態２を示す断面図である。
【図５】この発明の実施の形態３を示す平面図である。
【図６】この発明の実施の形態４を示す平面図である。
【図７】この発明の実施の形態５を示す平面図である。
【符号の説明】
１ 円筒状成形体、２ リング状予備成形体、２ａ 凹部、２ｂ 凸部、
３ 金型、３ａ 強磁性体、３ｂ 上下コア、３ｃ 上下パンチ、
４ 空洞（キャビティー）、５ 電磁コイル。[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic powder filling apparatus and a magnetic powder filling method for filling magnetic powder into a cavity of a magnet molding die under high pressure by compressing and pressing.
[0002]
[Prior art]
As a general method of filling the magnetic powder, there is a method of pouring the magnetic powder into a cavity of a mold and scraping the surface.
[0003]
At this time, there is a problem that the packing density becomes non-uniform due to bridges and cavities between the magnetic powders charged into the cavities.
[0004]
To solve this problem, a rotating magnetic field in a direction perpendicular to the direction in which the magnetic powder in the cavity is pressed is applied to the magnetic powder to eliminate bridges and cavities, and then the punch is used to punch the magnetic powder in the cavity. A device and a method for applying a compressive force to a material to fill the material at a high density are disclosed (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-9-78104 (pages 3-4, FIGS. 2 and 3)
[0006]
[Problems to be solved by the invention]
As described above, the conventional magnetic powder filling apparatus and method eliminates bridges and cavities by applying a rotating magnetic field to the magnetic powder in a direction perpendicular to the direction in which the magnetic powder in the cavity is pressed. Non-uniformity of the packing density due to cavities and cavities can be eliminated.
[0007]
However, the compression force of the punch is sufficiently transmitted to the magnetic powder near the punch side, but not sufficiently transmitted to the magnetic powder farther from the punch in the pressing axis direction. As a result, the density on the punch side is reduced. However, there is a problem that a difference in packing density occurs between the vicinity of the punch side and a position far from the punch.
[0008]
The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a magnetic powder filling apparatus and a magnetic powder filling method capable of reducing a difference in packing density of magnetic powder in a pressing axial direction. Things.
[0009]
[Means for Solving the Problems]
In the magnetic powder filling apparatus according to the present invention, the magnetic powder is put into a cavity formed in a mold, and the magnetic powder is compressed and pressed by a punch, so that the magnetic powder is densely packed in the cavity of the mold. In the magnetic powder filling device to be filled,
The mold has a through hole having a desired width, height and cross-sectional shape, penetrating through both end faces thereof,
The punch comprises a pair of punches whose width, height and cross-sectional shape are substantially the same as the cross-sectional shape of the through-hole, and the pair of punches is fitted into the through-hole from both ends of the mold to form the cavity. Tee is formed,
A magnetic field generator that generates a magnetic field that vertically flows through the through-hole,
A magnetic field moving unit that relatively moves the magnetic field with respect to the mold by moving one of the magnetic field generating unit and the mold bidirectionally in a direction formed by the pair of punches;
One of the pair of punches is fixed, and the other is a punch moving unit that moves the center to the through hole in accordance with the moving direction of the magnetic field that moves relative to the mold by the magnetic field moving unit. ,
It is provided with.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram (a) showing a configuration of a magnetic powder filling apparatus according to Embodiment 1 of the present invention, and a perspective view (b) showing a configuration of a lower die and a movable punch of a magnet molding die.
[0011]
As shown in FIG. 1, the magnet forming die includes an upper die 1, a lower die 2, and movable punches 3a and 3b. The lower die 2 has a groove 2a having a desired cross-sectional shape reaching both end surfaces 2b. Are formed, and a through hole is formed by overlapping the upper mold 1 with the lower mold 2.
[0012]
The movable punches 3a and 3b have the same shape as the groove 2a (through hole), and a cavity is formed by fitting and inserting the movable punches 3a and 3b into both ends of the through hole. By forming the magnet forming die with the upper die 1 and the lower die 2 and forming the groove 2a in the lower die 2, it is possible to easily put the magnetic powder into the cavity.
[0013]
Above the upper die 1 and below the lower die 2, permanent magnets 6a and 6b are disposed as magnetic field generating means so as to sandwich the groove 2a, and the permanent magnets 6a and 6b generate a magnetic field flowing through the groove 2a. . The width of the permanent magnets 6a and 6b is equal to or greater than the width of the groove 2a, and the width of the magnetic field generated by the permanent magnets 6a and 6b is equal to or greater than the width of the groove 2a, so that the distribution of the magnetic powder 10 in the width direction of the groove 2a is uniform. Can be
[0014]
The permanent magnets 6a and 6b are moved in both directions by the magnetic field moving means 4 by the movable punches 3a and 3b. One of the movable punches 3a and 3b is fixed by the punch moving means 5, and the other is located at the center of the groove 2a. To move in the same direction as the moving direction of the permanent magnets 6a and 6b.
[0015]
FIG. 2 shows the state of the magnetic powder when the magnetic powder is introduced into the cavity of the magnet molding die (a), and the state of the magnetic powder when a magnetic field is generated by the permanent magnets 6a and 6b (b). It is sectional drawing which shows typically.
[0016]
As shown in FIG. 2 (a), when the pre-measured magnetic powder is charged into the cavity, the magnetic powder 10 when charged is distributed in a chevron along the groove 2a, and the cavity 11 exists inside. . When a magnetic field is generated by the permanent magnets 6a and 6b in this state, as shown in FIG. 2B, the magnetic powder 10 is distributed almost uniformly along the groove 2a, and the cavity 11 is eliminated.
[0017]
FIG. 3 is a cross-sectional view illustrating a step of filling the magnetic powder 10 with high density from the state of FIG. 2B.
[0018]
First, as shown in FIG. 3A, the permanent magnets 6a and 6b are moved to the fixed movable punch 3b side, and the other movable punch 3a is moved to the center side of the groove 2a. By this moving operation, the magnetic powder 10 moves together with the magnetic field of the permanent magnets 6a and 6b to the one movable punch 3b side and contacts the movable punch 3b, and the volume of the cavity is reduced by the movement of the other movable punch 3a.
[0019]
Next, as shown in FIG. 3B, the permanent magnets 6a and 6b are moved to the fixed movable punch 3a side, and the other movable punch 3b is moved to the center side of the groove 2a. By this moving operation, the magnetic powder 10 moves to the one movable punch 3a side and comes into contact with the movable punch 3a, and the movement of the other movable punch 3b further reduces the volume of the cavity, and the coarse density portion 7 The volume decreases.
[0020]
Further, as shown in FIG. 3 (c), the operation shown in FIGS. 3 (a) and 3 (b) is repeated, and when the moving amount of the movable punches 3a, 3b reaches the set moving amount, the limiter operates. Thus, the movable punches 3a and 3b stop, and the high-density filling is completed.
[0021]
Final fill density is desirably set to 1.4 to 2.0 g / cm 3. That is, the remainder is small, the rough density portion 7 than 1.4 g / cm 3, not uniform filling exceeds 2.0 g / cm 3, in a magnetic field forming in the process after the high-density packing, orientation ratio And the magnetic properties decrease.
[0022]
The amount of movement of the movable punches 3a and 3b is determined and set from the measured amount of magnetic powder and the final packing density.
[0023]
The magnetic flux density in the cavity varies depending on the cross-sectional shape and area of the groove 2a, but the distance between the magnet molding die and the permanent magnets 6a and 6b is adjusted so as to be 20 mT to 100 mT, preferably 25 mT to 40 mT. I do.
[0024]
As described above, in this embodiment, the permanent magnets 6a and 6b generate a magnetic field flowing through the groove (cavity) 2a, and the permanent magnets 6a and 6b are bidirectionally formed by the pair of punches 3a and 3b. The operation of moving one of the pair of punches 3a and 3b and the operation of moving the other to the center of the cavity 2a in accordance with the direction of movement of the permanent magnets 6a and 6b is repeated by repeating the operation of moving one of the pair of punches 3a and 3b. The magnetic powder 10 can be filled at a high density while the filling density in the direction of the movable punches 3a and 3b is made uniform.
[0025]
This embodiment is applied to, for example, a molding step of manufacturing a neodymium sintered magnet through steps of alloy pulverization, molding, and sintering, whereby the packing density is made uniform, and as a result, sintering strain is reduced. Has been confirmed.
[0026]
Embodiment 2 FIG.
FIG. 4 is a sectional view showing Embodiment 2 of the present invention, and the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts.
[0027]
In the first embodiment, the magnetic field generating portions including the permanent magnets 6a and 6b are arranged above and below the magnet forming mold so as to sandwich the groove 2a. However, as shown in FIG. Thus, a combination of the permanent magnet 6a and the magnetic body 8 may be used.
[0028]
Embodiment 3 FIG.
FIG. 5 is a plan view showing Embodiment 3 of the present invention, and the same reference numerals as those in FIG. 1 denote the same or corresponding parts.
[0029]
In the first embodiment, the magnetic field generating portions including the permanent magnets 6a and 6b are arranged above and below the magnet forming mold so as to sandwich the groove 2a. However, as shown in FIG. 4, the permanent magnets 6a and 6b , An electromagnetic coil or an electromagnet 9 may be provided. By setting the magnetic field width generated by the electromagnetic coil or the electromagnet 9 to be equal to or larger than the width of the groove 2a, the distribution of the magnetic powder in the width direction of the groove 2a can be made uniform.
[0030]
Embodiment 4 FIG.
FIG. 6 is a plan view showing Embodiment 4 of the present invention, and the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
[0031]
In this embodiment, as shown in FIG. 6, a plurality of electromagnetic coils or electromagnets 9a, 9b, 9c similar to FIG. 5 are provided along the groove 2a, and the electromagnetic coils or electromagnets 9a, 9b, The magnetic field moving means for moving the magnetic field by sequentially switching the current flowing through 9c.
[0032]
Embodiment 5 FIG.
FIG. 7 is a plan view showing Embodiment 5 of the present invention, and the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
[0033]
When the magnetic field generation width is equal to or larger than the width of the groove as in the first to fourth embodiments, the magnetic field generation unit such as a permanent magnet may be moved along the groove. When the size of the magnetic punch cannot be increased, as shown in FIG. 7, the magnetic field generating unit such as the permanent magnet 6 is moved along an elliptical locus whose major axis is the direction of the movable punches 3a and 3b. Magnetic powder can be filled uniformly.
[0034]
In the first to fifth embodiments, the upper mold 1 and the lower mold 2 constituting the magnet forming mold are fixed, and the magnetic field generation of the permanent magnets 6a, 6b, the electromagnetic coils or the electromagnets 9, 9a, 9b, 9c and the like is performed. The moving part is moved in the direction formed by the movable punches 3a and 3b. However, the magnetic field generating part is fixed, the magnet forming mold is moved, and the magnetic field moves relative to the magnet forming mold. One of the movable punches 3a and 3b may be fixed, and the other may be moved in the direction of relative movement of the magnetic field with respect to the magnet molding die and toward the center of the groove 2a of the magnet molding die.
[0035]
Further, although the magnet forming mold is composed of the upper mold 1 and the lower mold 2 and the groove 2a is formed in the lower mold 2, a groove communicating with the groove 2a of the lower mold 2 may be formed in the upper mold 1. Further, the magnet forming mold may be an integral type. In this case, the magnet forming mold is provided with a through-hole having a desired cross-sectional shape reaching both end surfaces, and the cross-sectional shape of the through-hole is formed from both ends of the through-hole. It is sufficient that a pair of movable punches having the same cross-sectional shape as described above can be fitted and moved.
[0036]
【The invention's effect】
According to the magnetic powder filling apparatus according to the present invention, the magnetic powder is put into the cavity of the mold by charging the magnetic powder into the cavity formed in the mold and compressing and pressing the magnetic powder with a punch. In magnetic powder filling equipment for high density filling,
The mold has a through hole having a desired width, height and cross-sectional shape, penetrating through both end faces thereof,
The punch comprises a pair of punches whose width, height and cross-sectional shape are substantially the same as the cross-sectional shape of the through-hole, and the pair of punches is fitted into the through-hole from both ends of the mold to form the cavity. Tee is formed,
A magnetic field generator that generates a magnetic field that vertically flows through the through-hole,
A magnetic field moving unit that relatively moves the magnetic field with respect to the mold by moving one of the magnetic field generating unit and the mold bidirectionally in a direction formed by the pair of punches;
One of the pair of punches is fixed, and the other is a punch moving means for moving the other to the center of the through hole in accordance with the moving direction of the magnetic field relatively moving with respect to the mold by the magnetic field moving means. ,
Therefore, the magnetic powder can be filled at a high density while the filling density of the magnetic powder in the movable punch direction is made uniform.
[Brief description of the drawings]
FIG. 1A is a block diagram showing a configuration of a magnetic powder filling apparatus according to Embodiment 1 of the present invention, and FIG. 1B is a perspective view showing a configuration of a lower die and a movable punch of a magnet molding die.
FIG. 2 schematically shows a state of a magnetic powder when magnetic powder is introduced into a cavity of a magnet molding die (a) and a state of a magnetic powder when a magnetic field is generated by a permanent magnet (b). It is sectional drawing shown in FIG.
FIG. 3 is a cross-sectional view illustrating a step of filling magnetic powder at a high density.
FIG. 4 is a sectional view showing Embodiment 2 of the present invention.
FIG. 5 is a plan view showing a third embodiment of the present invention.
FIG. 6 is a plan view showing a fourth embodiment of the present invention.
FIG. 7 is a plan view showing a fifth embodiment of the present invention.
[Explanation of symbols]
1 cylindrical molded body, 2 ring-shaped preformed body, 2a concave portion, 2b convex portion,
3 mold, 3a ferromagnetic material, 3b upper and lower core, 3c upper and lower punch,
4 cavities, 5 electromagnetic coils.

Claims (8)

金型に形成されたキャビティーに磁性粉末を投入し、パンチによって上記磁性粉を圧縮加圧することにより上記金型のキャビティー内に上記磁性粉末を高密度充填する磁性粉充填装置において、
上記金型が、その両端面を貫通し、所望の幅、高さ及び断面形状の貫通孔を有し、
上記パンチは、幅、高さ及び断面形状が上記貫通孔の断面形状と略同一の一対のパンチからなり、上記金型の両端から上記一対のパンチを上記貫通孔に嵌合することによって上記キャビティーが形成され、
上記貫通孔を垂直に貫流する磁界を発生する磁界発生部と、
上記磁界発生部または上記金型のいずれか一方を、上記一対のパンチがなす方向へ双方向に移動させることにより、上記磁界を上記金型に対して相対移動させる磁界移動手段と、
上記一対のパンチのいずれか一方を固定し、他方を、上記磁界移動手段によって上記金型に対して相対移動する上記磁界の移動方向に合わせて上記貫通孔の中央側へ移動させるパンチ移動手段と、
を備えたことを特徴とする磁性粉充填装置。In a magnetic powder filling apparatus for charging magnetic powder into a cavity formed in a mold, and densely filling the magnetic powder in the cavity of the mold by compressing and pressing the magnetic powder with a punch,
The mold has a through hole having a desired width, height and cross-sectional shape, penetrating through both end faces thereof,
The punch comprises a pair of punches whose width, height and cross-sectional shape are substantially the same as the cross-sectional shape of the through-hole, and the pair of punches is fitted into the through-hole from both ends of the mold to form the cavity. Tee is formed,
A magnetic field generator that generates a magnetic field that vertically flows through the through-hole,
A magnetic field moving unit that relatively moves the magnetic field with respect to the mold by moving one of the magnetic field generating unit and the mold bidirectionally in a direction formed by the pair of punches;
One of the pair of punches is fixed, and the other is a punch moving unit that moves the center to the through hole in accordance with the moving direction of the magnetic field that moves relative to the mold by the magnetic field moving unit. ,
A magnetic powder filling device comprising: 上記金型は、上型と下型とからなり、上記下型に溝が形成され、上記貫通孔は、上記下型に上記上型を重ね合わせることによって形成されていることを特徴とする請求項１記載の磁性粉充填装置。The mold, comprising an upper mold and a lower mold, a groove is formed in the lower mold, and the through hole is formed by overlapping the upper mold with the lower mold. Item 7. A magnetic powder filling apparatus according to Item 1. 上記磁界発生部は、上記貫通孔の上記幅以上の幅を有することを特徴とする請求項１記載の磁性粉充填装置。2. The magnetic powder filling apparatus according to claim 1, wherein the magnetic field generator has a width equal to or greater than the width of the through hole. 上記磁界発生部は、上記貫通孔を挟むように配設された一対の永久磁石または永久磁石と磁性体からなることを特徴とする請求項１記載の磁性粉充填装置。2. The magnetic powder filling apparatus according to claim 1, wherein the magnetic field generating unit is made of a pair of permanent magnets or a permanent magnet and a magnetic material disposed so as to sandwich the through hole. 上記磁界発生部は、上記貫通孔上に配設された電磁コイルまたは電磁石からなることを特徴とする請求項１記載の磁性粉充填装置。2. The magnetic powder filling apparatus according to claim 1, wherein the magnetic field generating unit comprises an electromagnetic coil or an electromagnet disposed on the through hole. 上記磁界発生部は、複数個の電磁コイルまたは電磁石を上記貫通孔上で、上記一対のパンチがなす方向に沿って配設されてなり、上記複数個の電磁コイルまたは電磁石を順次作動させ、上記磁界を移動させることによって上記磁界移動手段を構成したことを特徴とする請求項１記載の磁性粉充填装置。The magnetic field generator is provided with a plurality of electromagnetic coils or electromagnets on the through hole along a direction formed by the pair of punches, and sequentially operates the plurality of electromagnetic coils or electromagnets, 2. A magnetic powder filling apparatus according to claim 1, wherein said magnetic field moving means is constituted by moving a magnetic field. 金型に形成されたキャビティー内に磁性粉を投入し、パンチで上記磁性粉を圧縮加圧することにより上記金型のキャビティー内に上記磁性粉を高密度に充填する磁性粉充填方法において、
上記金型に、その両端面に至る所望の断面形状の貫通孔を形成し、
上記金型の両端面から上記貫通孔に一対のパンチを嵌合するによって上記キャビティーが形成されるように構成し、
上記キャビティーに磁性粉を投入し、
上記貫通孔を垂直に貫流する磁界を発生させ、
上記磁界を上記金型に対して上記一対のパンチがなす方向の一方へ相対移動させ、上記一対のパンチのいずれか一方を固定し、他方を、上記磁界の相対移動方向に合わせて上記貫通孔の中央側へ移動させる動作を繰り返して上記磁性粉を圧縮加圧することにより上記金型のキャビティー内に上記磁性粉を高密度に充填することを特徴とする磁性粉充填方法。In a magnetic powder filling method of charging magnetic powder into a cavity formed in a mold, and filling the magnetic powder with high density in the cavity of the mold by compressing and pressing the magnetic powder with a punch,
In the mold, a through-hole having a desired cross-sectional shape reaching both end surfaces thereof is formed,
The cavity is formed by fitting a pair of punches into the through hole from both end surfaces of the mold,
Put the magnetic powder into the cavity,
Generating a magnetic field vertically flowing through the through hole,
The magnetic field is moved relative to the mold in one of the directions formed by the pair of punches, one of the pair of punches is fixed, and the other is aligned with the relative movement direction of the magnetic field. A method of filling the magnetic powder at a high density in the cavity of the mold by repeatedly compressing and pressing the magnetic powder by moving the magnetic powder toward the center of the mold. 上記磁界を、上記一対のパンチがなす方向を長軸とする楕円形の軌跡に沿って移動させることを特徴とする請求項７記載の磁性粉充填方法。The method according to claim 7, wherein the magnetic field is moved along an elliptical locus whose major axis is a direction formed by the pair of punches.
JP2003038101A 2003-02-17 2003-02-17 Magnetic powder filling apparatus, magnetic powder filling method, and neodymium sintered magnet manufacturing method Expired - Fee Related JP3851281B2 (en)

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