JPH0138903Y2 - - Google Patents
Info
- Publication number
- JPH0138903Y2 JPH0138903Y2 JP6149984U JP6149984U JPH0138903Y2 JP H0138903 Y2 JPH0138903 Y2 JP H0138903Y2 JP 6149984 U JP6149984 U JP 6149984U JP 6149984 U JP6149984 U JP 6149984U JP H0138903 Y2 JPH0138903 Y2 JP H0138903Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic body
- mold
- cavity
- width
- 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
Links
- 239000000696 magnetic material Substances 0.000 claims description 23
- 229920005989 resin Polymers 0.000 claims description 20
- 239000011347 resin Substances 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 230000004907 flux Effects 0.000 description 13
- 239000000843 powder Substances 0.000 description 11
- 238000001746 injection moulding Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 239000002861 polymer material Substances 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910052712 strontium Inorganic materials 0.000 description 3
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000004641 Diallyl-phthalate Substances 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920000571 Nylon 11 Polymers 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- QUDWYFHPNIMBFC-UHFFFAOYSA-N bis(prop-2-enyl) benzene-1,2-dicarboxylate Chemical compound C=CCOC(=O)C1=CC=CC=C1C(=O)OCC=C QUDWYFHPNIMBFC-UHFFFAOYSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
Landscapes
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
本考案は磁石粉末と重合体材料との混合物を磁
界中で射出成形して、異方性樹脂磁石を製造する
際に用いられる金型に関するものである。[Detailed Description of the Invention] The present invention relates to a mold used when manufacturing an anisotropic resin magnet by injection molding a mixture of magnet powder and a polymer material in a magnetic field.
直流モーターや燃料計等の回転機器に用いられ
ている２極着磁磁石は小型で精密な寸法形状と大
きな磁束を持つものが要求されている。この要求
を満たすため、保磁力の高いバリウムフエライト
やストロンチウムフエライト等を高温（約1150
℃）で焼いた焼結磁石が主として使用されている
が、高温で焼結されるために焼結体の外観に歪が
生じ易く、通常研摩加工によつている。 BACKGROUND ART Two-pole magnetized magnets used in rotating equipment such as DC motors and fuel gauges are required to be small, have precise dimensions and shapes, and have a large magnetic flux. To meet this requirement, barium ferrite, strontium ferrite, etc. with high coercive force are used at high temperatures (approximately 1150
Sintered magnets sintered at temperatures (°C) are mainly used; however, because they are sintered at high temperatures, the appearance of the sintered bodies tends to be distorted, so they are usually subjected to polishing.
一方、上記焼結法の欠点を改善するために、重
合体材料と磁石粉末との混合物を加熱状態で磁界
を印加しながら射出成形することにより、半径方
向放射状に磁石粉末を配向させた寸法精度の良好
な回転機用の筒状異方性樹脂磁石が得られること
も知られている（例えば、特公昭58−53491号公
報）。しかしながらこの方法では、円盤や細長い
円筒・円柱形状でその軸と垂直になる外周面に２
極着磁しても大きな磁石密度のプラスチツク磁石
は得られない。また一般的に行われている金型型
開き方向に磁界を印加し、且つ型開き方向と垂直
になる様に円柱・円筒状キヤビテイの軸方向を配
して、その外周方向に２極配向（以後外周２極異
方性と呼ぶ）した場合には十分な配向により大き
な磁東密度が得られるが、磁石にシヤフト等のイ
ンサートを行う場合はシヤフトの固定が難しく、
また円筒・円柱の外周面にパーテイングライン
（金型合せ面での線）ができて表面がなめらかに
ならないため、燃料計やモーターのローターには
使用できないという欠点がある。 On the other hand, in order to improve the drawbacks of the above-mentioned sintering method, by injection molding a mixture of polymer material and magnet powder while applying a magnetic field in a heated state, the dimensional accuracy of the magnet powder was oriented radially in the radial direction. It is also known that a cylindrical anisotropic resin magnet for rotating machines with good properties can be obtained (for example, Japanese Patent Publication No. 58-53491). However, with this method, there are two
Even with polar magnetization, a plastic magnet with a large magnetic density cannot be obtained. In addition, a magnetic field is applied in the general mold opening direction, and the axial direction of the cylinder/cylindrical cavity is arranged perpendicular to the mold opening direction, and the bipolar orientation ( (Hereafter referred to as periphery bipolar anisotropy), a large magnetic east density can be obtained with sufficient orientation, but when inserting a shaft into the magnet, it is difficult to fix the shaft.
Another drawback is that it cannot be used for fuel gauges or motor rotors because parting lines (lines at the mold mating surface) are formed on the outer circumferential surface of cylinders and cylinders, making the surface unsmooth.
本考案者は上記の如き欠点のない外周２極異方
性プラスチツク磁石等を得るための金型について
鋭意検討した結果、円柱、円盤及び円筒キヤビテ
イの軸方向を金型型開き方向と平行とし、磁性材
と非磁性材とを特定の組合せで配置した金型を用
いると、電磁石コイルで型開き方向に発生させた
磁束の流れをキヤビテイ部で垂直に曲げ、キヤビ
テイの外周方向に磁界を印加でき、前記の如き欠
点が改善されることを見出し、本考案を完成する
に至つた。 As a result of intensive study on a mold for obtaining an anisotropic plastic magnet with a bipolar outer circumference free from the above-mentioned drawbacks, the present inventor made the axial direction of the cylinder, disk, and cylindrical cavity parallel to the opening direction of the mold, By using a mold in which magnetic and non-magnetic materials are arranged in a specific combination, the flow of magnetic flux generated in the mold opening direction by the electromagnetic coil is bent perpendicularly at the cavity part, and a magnetic field can be applied in the direction of the outer circumference of the cavity. They have found that the above-mentioned drawbacks can be improved, and have completed the present invention.
すなわち本考案は、磁界の印加方向が型開き方
向と平行になるように電磁石コイル１が金型内あ
るいは金型外に配置され、キヤビテイと同じ長さ
以上の磁性あるいは非磁性体５内に片端面が型開
き面に接するように形成された筒状、柱状あるい
は盤状キヤビテイ６を複数個有し、かつ該磁性あ
るいは非磁性体５の内側が内部磁性体４からな
り、その反対側が外部磁性体７からなる異方性樹
脂磁石射出成形用金型において、上記内部磁性体
４と磁性あるいは非磁性体５とキヤビテイ６と外
部磁性体７とで形成される部分の片端面が、内部
磁性体４と軸線が同一の柱状磁性体３とこの柱状
磁性体３の外側に配置された非磁性体１１とに接
し、もう一方の片端面が内部磁性体４と軸線が同
一の非磁性体１２とこの非磁性体１２の外側に配
置された筒状磁性体８とに接し、かつ柱状磁性体
３の差渡しａと内部磁性体４の差渡しｂとがａ≦
ｂであり、外部磁性体７の差渡しｃと非磁性体１
２の差渡しｄとがｃ≦ｄであることを特徴とする
異方性樹脂磁石射出成形用金型を提供するもので
ある。 In other words, in the present invention, an electromagnetic coil 1 is placed inside or outside the mold so that the direction of application of the magnetic field is parallel to the mold opening direction, and a magnetic or non-magnetic material 5 with a length equal to or longer than the cavity is placed. It has a plurality of cylindrical, columnar, or disc-shaped cavities 6 whose end surfaces are in contact with the mold opening surface, and the inside of the magnetic or non-magnetic material 5 is made of an internal magnetic material 4, and the opposite side is made of an external magnetic material. In the anisotropic resin magnet injection molding mold consisting of the body 7, one end surface of the portion formed by the internal magnetic body 4, the magnetic or non-magnetic body 5, the cavity 6, and the external magnetic body 7 is the internal magnetic body. 4 and a non-magnetic body 11 disposed outside the columnar magnetic body 3, and the other end surface is in contact with a non-magnetic body 12 whose axis is the same as that of the internal magnetic body 4. This non-magnetic body 12 is in contact with the cylindrical magnetic body 8 disposed outside, and the span a of the columnar magnetic body 3 and the span b of the internal magnetic body 4 are a≦
b, and the width c of the external magnetic body 7 and the non-magnetic body 1
The present invention provides a mold for injection molding an anisotropic resin magnet, characterized in that the width d of the two satisfies c≦d.
以下に本考案の異方性樹脂磁石射出成形用金型
を図面に基づいて詳細に説明する。 EMBODIMENT OF THE INVENTION Below, the anisotropic resin magnet injection mold of this invention is demonstrated in detail based on drawing.
第１図は本考案の実施例の一例であつて、金型
外に配置された１個の電磁石コイルを用いて外周
２極異方性樹脂磁石を１回に６個成形できる金型
の断面図であり、は移動側金型、は固定側金
型である。第２図は第１図に示す移動側金型の
Ａ−Ａ面（型開き面）の平面図である。１は電磁
石コイル、２は移動側金型取付板に続く磁性ある
いは非磁性体からなる移動側ブロツク、９は固定
側金型取付板に続く磁性あるいは非磁性体からな
る固定側ブロツクであり、電磁石コイル１によつ
て磁界を印加すると磁束は移動側ブロツク２から
固定側ブロツク９に向かう方向に金型内を通過
し、金型外の空気中を通つて循環するか、あるい
はその逆方向に流れる。つまり、金型内では磁界
の印加方向が型開き方向と平行である。 Figure 1 is an example of an embodiment of the present invention, and shows a cross section of a mold that can mold six bipolar anisotropic resin magnets at a time using one electromagnetic coil placed outside the mold. In the figure, is a movable side mold, and is a stationary side mold. FIG. 2 is a plan view of the A-A plane (mold opening surface) of the movable mold shown in FIG. 1. FIG. 1 is an electromagnetic coil, 2 is a moving side block made of magnetic or non-magnetic material following the moving side mold mounting plate, 9 is a fixed side block made of magnetic or nonmagnetic material following the fixed side mold mounting plate, and the electromagnet When a magnetic field is applied by the coil 1, the magnetic flux passes through the mold in the direction from the moving block 2 to the stationary block 9, circulates through the air outside the mold, or flows in the opposite direction. . That is, within the mold, the direction of application of the magnetic field is parallel to the mold opening direction.
また、太い実線の矢印は金型内における磁束の
流れを示し、３は柱状磁性体、４は柱状の内部磁
性体、５は筒状の非磁性体、６は非磁性体５内に
複数個形成された柱状のキヤビテイ、７は筒状の
外部磁性体、８は固定側にある筒状の磁性体、１
０は非磁性体からなる突出ピン、１１は柱状磁性
体３の外側に配置された外部磁性体、１２は固定
側にあるブロツク状非磁性体であつて、キヤビテ
イ６以外はそれぞれ軸線を同一にしており、柱状
磁性体３の差渡しａは内部磁性体４の差渡しｂよ
り小さく、外部磁性体７の差渡しｃは固定側非磁
性体１２の差渡しｄより小さい。 In addition, thick solid arrows indicate the flow of magnetic flux within the mold, 3 is a columnar magnetic body, 4 is a columnar internal magnetic body, 5 is a cylindrical non-magnetic body, and 6 is a plurality of pieces inside the non-magnetic body 5. The formed columnar cavity, 7 is a cylindrical external magnetic body, 8 is a cylindrical magnetic body on the fixed side, 1
0 is a protruding pin made of a non-magnetic material, 11 is an external magnetic material disposed outside the columnar magnetic material 3, and 12 is a block-shaped non-magnetic material on the fixed side, all of which have the same axis except for the cavity 6. The width a of the columnar magnetic body 3 is smaller than the width b of the internal magnetic body 4, and the width c of the external magnetic body 7 is smaller than the width d of the fixed non-magnetic body 12.
これらは型開き方向と平行に直進してきた磁束
の流れを、それとは直行する方向に放射状に無理
なく変更させ、キヤビテイ６内に均一に乱れない
磁束を導くために配置されており、なかでも柱状
磁性体３とブロツク状非磁性体１２の差渡しの大
きさを特定の範囲に限定することが重要である。 These are arranged to smoothly change the flow of magnetic flux that has been traveling straight parallel to the mold opening direction to a radial direction perpendicular to that direction, and to guide the magnetic flux uniformly and undisturbed into the cavity 6. It is important to limit the distance between the magnetic material 3 and the block-shaped nonmagnetic material 12 to a specific range.
柱状磁性体３の差渡しａは内部磁性体４の差渡
しｂに対してａ≦ｂであることが必要であり、ａ
はｂに対して通常０〜50mm、好ましくは５〜30mm
小さい。またブロツク状非磁性体１２の差渡しｄ
は外部磁性体７の差渡しｃに対してｃ≦ｄである
こと、換言すればブロツク状非磁性体１２の型開
き面が少なくとも内部磁性体４の型開き面の全面
およびキヤビテイ６の型開き面の全面に接し、好
ましくは更に外部磁性体７の型開き面の一部に接
することが必要であり、ｄはｃに対して通常０〜
50mm、好ましくは10〜30mm大きい。ａ＞ｂおよ
び／又はｃ＞ｄの場合には磁束の流れを型開き方
向と直交する方向に変更させることが困難であり
好ましくない。 It is necessary that the width a of the columnar magnetic body 3 satisfies a≦b with respect to the width b of the internal magnetic body 4, and a
is usually 0 to 50 mm, preferably 5 to 30 mm relative to b
small. Also, the length d of the block-shaped nonmagnetic material 12
c≦d with respect to the width c of the external magnetic body 7. In other words, the mold opening surface of the block-shaped nonmagnetic material 12 is at least the entire mold opening surface of the internal magnetic material 4 and the mold opening surface of the cavity 6. It is necessary to contact the entire surface of the surface, preferably a part of the mold opening surface of the external magnetic body 7, and d is usually 0 to c with respect to c.
50mm, preferably 10-30mm larger. If a>b and/or c>d, it is difficult to change the flow of magnetic flux in a direction perpendicular to the mold opening direction, which is not preferable.
１３はノズル、１４はスプル、１５はランナで
ある。 13 is a nozzle, 14 is a sprue, and 15 is a runner.
第３図は、ランナー・ゲート位置をＮ極・Ｓ極
の中間に配することによつて、ゲート及びウエル
ド部による着磁波形の乱れを防止した円筒形磁石
８個取り金型の型開き面の平面図である。また第
４〜５図は、同じく８個取りだがゲートとしてピ
ンゲートを用い、第１〜３図の円柱（円筒状磁性
体あるいは非磁性体のかわりに角柱状磁性体ある
いは非磁性体を用いた例であり、第４図は断面
図、第５図はＡ−Ａ面（型開き面）の平面図であ
る。 Figure 3 shows the opening surface of a mold with eight cylindrical magnets, which prevents disturbance of the magnetization waveform due to the gate and weld by placing the runner and gate between the N and S poles. FIG. In addition, Figures 4 and 5 show an example in which a pin gate is used as the gate, although the gate is made of 8 pieces, and a prismatic magnetic or non-magnetic material is used instead of the cylinder (cylindrical magnetic or non-magnetic material) shown in Figures 1 to 3. FIG. 4 is a sectional view, and FIG. 5 is a plan view taken along the line AA (mold opening surface).
尚、キヤビテイ６は磁性体内に形成してもよい
が、第１〜５図の如く非磁性体内に形成すること
が好ましい。また第５図の如きキヤビテイの配置
はキヤビテイ部における磁束の流れが平行である
点で、磁束の流れがキヤビテイ部で平行ではない
第２〜３図の配置に比べ好ましい。 Although the cavity 6 may be formed in a magnetic body, it is preferably formed in a non-magnetic body as shown in FIGS. 1 to 5. Further, the cavity arrangement as shown in FIG. 5 is preferable in that the magnetic flux flows in parallel in the cavity, compared to the arrangement in FIGS. 2 and 3, in which the magnetic flux flows in parallel in the cavity.
本考案の金型を用いて異方性筒状樹脂磁石を成
形するには、電磁石コイル１により磁界を印加し
ながら磁石粉末と重合体材料との混合物を所定温
度で射出成形すればよい。射出成形機で溶融混練
され、多数個の筒状キヤビテイ６に射出充填され
た該混合物は、充填されると同時に型開きと垂直
方向に均一に配向され、冷却固化されて、外周２
極異方性樹脂磁石として得られる。 In order to mold an anisotropic cylindrical resin magnet using the mold of the present invention, a mixture of magnet powder and polymer material may be injection molded at a predetermined temperature while a magnetic field is applied by the electromagnetic coil 1. The mixture is melt-kneaded in an injection molding machine and injected into a large number of cylindrical cavities 6. At the same time as the mixture is filled, it is oriented uniformly in a direction perpendicular to the mold opening, and is cooled and solidified to form the outer periphery 2.
Obtained as a polar anisotropic resin magnet.
ここで使用される磁石粉末としては、例えばス
トロンチウムフエライト、バリウムフエライト等
のフエライト磁石粉末、RCO5，R2CO17等の希土
類コバルト磁石粉末、アルニコ磁石粉末、Fe−
Cr−Co磁石粉末、Mn−A1−Ｃ磁石粉末等が挙
げられる。 Examples of the magnet powder used here include ferrite magnet powder such as strontium ferrite and barium ferrite, rare earth cobalt magnet powder such as RCO 5 and R 2 CO 17 , alnico magnet powder, Fe-
Examples include Cr-Co magnet powder and Mn-A1-C magnet powder.
また重合体材料としては、ポリエチレン、ポリ
プロピレン、ポリスチレン、ABS樹脂、AS樹
脂、エチレン−酢酸ビニル共重合体、エチレン−
エチルアクリレート共重合体、ポリエチレンテレ
フタレート、ポリブチレンテレフタレート、ポリ
アセタール、熱可塑性ポリウレタン、アイオノマ
ー樹脂、オレフイン−ビニルアルコール共重合
体、ナイロン６、ナイロン６６、ナイロン１２、
ナイロン１１等の熱可塑性樹脂、フエノールホル
ムアルデヒド樹脂、尿素−ホルムアルデヒド樹
脂、エポキシ樹脂、不飽和ポリエステル、ジアリ
ルフタレート樹脂等の熱硬化性樹脂、天然ゴム、
スチレン−ブタジエンゴム、ニトリルゴム、クロ
ロプレンゴム等のゴム、シリコーン樹脂等が挙げ
られるが、なかでも熱可塑性樹脂が好ましい。 Polymer materials include polyethylene, polypropylene, polystyrene, ABS resin, AS resin, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer,
Ethyl acrylate copolymer, polyethylene terephthalate, polybutylene terephthalate, polyacetal, thermoplastic polyurethane, ionomer resin, olefin-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 12,
Thermoplastic resins such as nylon 11, thermosetting resins such as phenol formaldehyde resin, urea-formaldehyde resin, epoxy resin, unsaturated polyester, diallyl phthalate resin, natural rubber,
Examples include rubbers such as styrene-butadiene rubber, nitrile rubber, and chloroprene rubber, and silicone resins, among which thermoplastic resins are preferred.
以上の様にして得られる本考案の金型による外
周２極異方性樹脂磁石は、多数個取りによる量産
が可能で、寸法精度に優れ、高い磁気特性が得ら
れる。例えば、第３図の構造の金型を用い、スト
ロンチウムフエライト粉末87重量部とナイロン
613重量部とからなる混合物を、5000エルステツ
ドの磁界を有するキヤビテイに射出成形し、脱磁
後10000エルステツドの平行磁界で再着磁して得
られた、外径12mm、内径４mm、高さ８mmの外周２
極異方性樹脂磁石は、表面磁束密度分布がきれい
な正弦波を示し、その最大表面磁束密度は1020ガ
ウスと優れるものであつた。尚、同一形状の等方
性焼結磁石および半径方向異方性樹脂磁石の表面
磁束密度分布はともに台形波を示し、最大表面磁
束密度はそれぞれ870ガウスおよび720ガウスであ
つた。 The two-pole outer anisotropic resin magnet obtained using the mold of the present invention obtained as described above can be mass-produced by molding a large number of magnets, has excellent dimensional accuracy, and has high magnetic properties. For example, using a mold with the structure shown in Figure 3, 87 parts by weight of strontium ferrite powder and nylon
A mixture consisting of 613 parts by weight was injection molded into a cavity with a magnetic field of 5,000 oersted, and after demagnetizing it was re-magnetized in a parallel magnetic field of 10,000 oersted. Outer circumference 2
The polar anisotropic resin magnet exhibited a clean sinusoidal surface magnetic flux density distribution, and its maximum surface magnetic flux density was an excellent 1020 Gauss. Incidentally, the surface magnetic flux density distributions of the isotropic sintered magnet and the radially anisotropic resin magnet having the same shape both showed a trapezoidal wave, and the maximum surface magnetic flux density was 870 Gauss and 720 Gauss, respectively.
第１図は、金型外に電磁石コイルを有し、円柱
状キヤビテイを６個有する本考案の外周２極異方
性樹脂磁石射出成形用金型の断面図、第２図は第
１図に示す移動側金型のＡ−Ａ（型開き面）の
平面図、第３図はランナー・ゲート位置をＮ極・
Ｓ極の中間に配した円筒形キヤビテイを８個有す
る本考案の外周２極異方性樹脂磁石射出成形用金
型の移動側金型型開き面の平面図、第４図はピン
ゲートを有する円柱状キヤビテイを４個づつ２列
配置した本考案の外周２極異方性樹脂磁石射出成
形用金型、第５図は第４図に示す移動側金型の
Ａ−Ａ面（型開き面）の平面図である。
：移動側金型、：固定側金型。１：電磁石
コイル、２：移動側ブロツク、３：柱状磁性体、
４：内部磁性体、５：磁性あるいは非磁性体、
６：キヤビテイ、７：外部磁性体、８：筒状磁性
体、９：固定側ブロツク、１０：突出ピン、１
１：外部非磁性体、１２：非磁性体、１３：ノズ
ル、１４：スプル、１５：ランナ。ａ：柱状磁性
体３の差渡し、ｂ：内部磁性体４の差渡し、ｃ：
外部磁性体７の差渡し。
Figure 1 is a cross-sectional view of an injection mold for an anisotropic resin magnet with an outer circumference of two poles according to the present invention, which has an electromagnetic coil outside the mold and six cylindrical cavities, and Figure 2 is similar to Figure 1. The A-A (mold opening surface) plan view of the movable mold shown in Figure 3 shows the runner and gate positions being
FIG. 4 is a plan view of the mold opening surface of the movable side mold of the present invention's outer periphery bipolar anisotropic resin magnet injection mold having eight cylindrical cavities arranged in the middle of the S pole. FIG. 4 shows a circle with a pin gate. Fig. 5 shows the A-A plane (mold opening surface) of the movable mold shown in Fig. 4, which is an injection mold for injection molding of an anisotropic resin magnet with two outer circumferences according to the present invention, in which two rows of four columnar cavities are arranged. FIG. : Moving side mold, : Fixed side mold. 1: Electromagnetic coil, 2: Moving side block, 3: Columnar magnetic body,
4: Internal magnetic material, 5: Magnetic or non-magnetic material,
6: Cavity, 7: External magnetic body, 8: Cylindrical magnetic body, 9: Fixed side block, 10: Projection pin, 1
1: External non-magnetic material, 12: Non-magnetic material, 13: Nozzle, 14: Sprue, 15: Runner. a: Passing of the columnar magnetic body 3, b: Passing of the internal magnetic body 4, c:
Passing the external magnetic body 7.
Claims (1)
に電磁石コイル１が金型内あるいは金型外に配置
され、キヤビテイと同じ長さ以上の磁性あるいは
非磁性体５内に片端面が型開き面に接するように
形成された筒状、柱状あるいは盤状キヤビテイ６
を複数個有し、かつ該磁性あるいは非磁性体５の
内側が内部磁性体４からなり、その反対側が外部
磁性体７からなる異方性樹脂磁石射出成形用金型
において、上記内部磁性体４と磁性あるいは非磁
性体５とキヤビテイ６と外部磁性体７とで形成さ
れる部分の片端面が、内部磁性体４と軸線が同一
の柱状磁性体３とこの柱状磁性体３の外側に配置
された非磁性体１１とに接し、もう一方の片端面
が内部磁性体４と軸線が同一の非磁性体１２とこ
の非磁性体１２の外側に配置された筒状磁性体８
とに接し、かつ柱状磁性体３の差渡しａと内部磁
性体４の差渡しｂとがａ≦ｂであり、外部磁性体
７の差渡しｃと非磁性体１２の差渡しｄとがｃ≦
ｄであることを特徴とする異方性樹脂磁石射出成
形用金型。 An electromagnetic coil 1 is placed inside or outside the mold so that the direction of application of the magnetic field is parallel to the mold opening direction, and one end surface is placed in a magnetic or non-magnetic material 5 with a length equal to or longer than the cavity. A cylindrical, columnar or disc-shaped cavity 6 formed so as to be in contact with
In an anisotropic resin magnet injection mold having a plurality of magnetic or non-magnetic bodies 5, the inside of which is an internal magnetic body 4, and the opposite side thereof is an external magnetic body 7, the internal magnetic body 4 is One end surface of the part formed by the magnetic or non-magnetic material 5, the cavity 6, and the external magnetic material 7 is arranged on the outside of the columnar magnetic material 3 whose axis is the same as that of the internal magnetic material 4. a non-magnetic body 12 that is in contact with the non-magnetic body 11 and whose other end surface has the same axis as the internal magnetic body 4; and a cylindrical magnetic body 8 disposed outside the non-magnetic body 12.
and the width a of the columnar magnetic body 3 and the width b of the internal magnetic body 4 are a≦b, and the width c of the external magnetic body 7 and the width d of the non-magnetic body 12 are c. ≦
An anisotropic resin magnet injection mold characterized by d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6149984U JPS60174228U (en) | 1984-04-27 | 1984-04-27 | Anisotropic resin magnet injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6149984U JPS60174228U (en) | 1984-04-27 | 1984-04-27 | Anisotropic resin magnet injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60174228U JPS60174228U (en) | 1985-11-19 |
| JPH0138903Y2 true JPH0138903Y2 (en) | 1989-11-21 |
Family
ID=30589837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6149984U Granted JPS60174228U (en) | 1984-04-27 | 1984-04-27 | Anisotropic resin magnet injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60174228U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7027898B2 (en) * | 2018-01-15 | 2022-03-02 | 住友金属鉱山株式会社 | Mold for forming anisotropic magnet and method for manufacturing anisotropic magnet using this |
-
1984
- 1984-04-27 JP JP6149984U patent/JPS60174228U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60174228U (en) | 1985-11-19 |
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