JPH0664001A - Injection mold for resin magnet roll - Google Patents
Injection mold for resin magnet rollInfo
- Publication number
- JPH0664001A JPH0664001A JP24272492A JP24272492A JPH0664001A JP H0664001 A JPH0664001 A JP H0664001A JP 24272492 A JP24272492 A JP 24272492A JP 24272492 A JP24272492 A JP 24272492A JP H0664001 A JPH0664001 A JP H0664001A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- space
- injection
- cooling
- resin 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.)
- Granted
Links
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は普通紙用複写機、プリン
ター、ファクシミリ等の静電現像装置に用いるマグネッ
トロールの製造方法に関し、更に詳しくは射出成型時の
冷却固化時間の短縮をはかることができ生産性向上に寄
与することができる樹脂マグネットロール用射出成形金
型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnet roll used in an electrostatic developing device such as a copying machine for plain paper, a printer, a facsimile, etc., and more specifically, to shorten the cooling and solidifying time during injection molding. The present invention relates to an injection molding die for a resin magnet roll, which can contribute to improving productivity.
【０００２】[0002]
【従来の技術】複写機やファクシミリ等の電子写真現像
装置には、感光ドラム等の静電潜像担持体に現像剤を搬
送する装置としてマグネットロールが用いられている。
マグネットロールは図１１に示す如く、円柱体ａの両端
に回転用の軸部ｂ，ｂを突設した外観を有している。こ
のようなマグネットロールの作製方法としては、例え
ば、円筒状マグネット体に金属シャフトを貫通させる方
法や、金型内でマグネット内に金属シャフトをインサー
ト成型する方法等があるが、磁石体積が増やせることや
組立工数が減らせる等の理由から金属シャフトを用いる
ことなく軸部を含む全体を射出成型により一体成型する
ことが最近行われている。2. Description of the Related Art In an electrophotographic developing device such as a copying machine or a facsimile, a magnet roll is used as a device for conveying a developer to an electrostatic latent image carrier such as a photosensitive drum.
As shown in FIG. 11, the magnet roll has an appearance in which shafts b for rotation are provided at both ends of a cylindrical body a so as to project. Examples of a method for producing such a magnet roll include a method of penetrating a metal shaft in a cylindrical magnet body, and a method of insert-molding a metal shaft in a magnet in a mold, but the magnet volume can be increased. In order to reduce the number of assembling steps and the like, it has been recently performed to integrally mold the whole including a shaft portion by injection molding without using a metal shaft.
【０００３】射出成型による一体成型は、磁性分を合成
樹脂バインダに混練した樹脂磁石原料を射出成型機にお
いて加熱混練し、溶融した樹脂磁石原料を金型に注入し
て金型内で冷却固化させて行われている。In the integral molding by injection molding, a resin magnet raw material in which a magnetic component is kneaded in a synthetic resin binder is heated and kneaded in an injection molding machine, and the molten resin magnet raw material is poured into a mold and cooled and solidified in the mold. Is being done.
【０００４】図１２はこの一体成型に用いられる射出成
形金型の端面説明図であり、図中ｃがキャビティ型、ｄ
がキャビティ、ｅは射出樹脂流入口、ｆは樹脂の冷却固
化を促進するための冷却水路である。キャビティｄはロ
ール本体形成用空間ｄ１と軸部形成用空間ｄ２，ｄ２を
有し、当該キャビティｄに樹脂磁石原料を射出すること
で軸部一体型マグネットロールが成形できるように構成
されている。FIG. 12 is an end face explanatory view of an injection molding die used for this integral molding, in which c is a cavity mold and d is a mold.
Is a cavity, e is an injection resin inflow port, and f is a cooling water channel for promoting the cooling and solidification of the resin. The cavity d has a roll body forming space d1 and shaft portion forming spaces d2 and d2, and is configured so that a shaft portion integrated magnet roll can be formed by injecting a resin magnet raw material into the cavity d.
【０００５】樹脂マグネットロールの成型法が通常の射
出成型法と異なっているのは、金型内で磁場を印加し、
樹脂磁石原料に含まれる磁性粉を配向させる必要がある
ことであり、図示するように金型内には永久磁石や電磁
石よりなる配向用磁場発生装置ｇが組み込まれている。The difference between the resin magnet roll molding method and the normal injection molding method is that a magnetic field is applied in the mold.
This is because it is necessary to orient the magnetic powder contained in the resin magnet raw material, and as shown in the figure, an orienting magnetic field generator g including a permanent magnet or an electromagnet is incorporated in the mold.
【０００６】金型内で成形された樹脂マグネットロール
は成形品の固化が不十分であると、金型内からの取り出
しが困難となるため、金型内で充分冷却固化させたうえ
金型内から取り出している。射出成形法における金型内
での冷却固化時間は生産能力に大きく影響し、冷却固化
時間を如何に短縮するかが生産性を向上させるうえでの
重要な要素となっている。If the resin magnet roll molded in the mold is insufficiently solidified, it will be difficult to remove it from the mold. Therefore, the resin magnet roll should be sufficiently cooled and solidified in the mold before being molded. Is taken from. The cooling and solidifying time in the mold in the injection molding method greatly affects the production capacity, and how to shorten the cooling and solidifying time is an important factor for improving the productivity.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら樹脂マグ
ネットロール用射出成形金型においては前述したよう
に、配向用磁場発生装置ｇが組み込まれており、しかも
この配向用磁場発生装置ｇはその発生磁場を高めるため
にキャビティｄに可能な限り近づけるように配置してい
ることから、キャビティ型ｃの冷却能力も低いのが現状
である。However, in the injection molding die for the resin magnet roll, as described above, the orientation magnetic field generator g is incorporated, and the orientation magnetic field generator g generates the generated magnetic field. Since it is arranged so as to be as close as possible to the cavity d in order to raise the height, the cooling capacity of the cavity mold c is also low at present.
【０００８】また金型内に冷却水路を配設することによ
って冷却能力を高めることも考慮されるが、この場合に
も、配向用磁場発生装置ｇがキャビティｄ近傍に配置さ
れていることから、冷却水路はキャビティｄに近接して
形成することができず、このため図例の如く冷却水路ｆ
は配向用磁場発生装置ｇの外側に配設せざるを得ず、冷
却能力は低かった。It is also considered to increase the cooling capacity by disposing a cooling water channel in the mold, but in this case as well, since the magnetic field generator for orientation g is disposed in the vicinity of the cavity d, The cooling water channel cannot be formed close to the cavity d, so that the cooling water channel f can be formed as shown in FIG.
Had to be arranged outside the orientation magnetic field generator g, and the cooling capacity was low.
【０００９】金型の冷却能力は成形スピードを大きく左
右することから射出成形金型において重要なことは一般
的に認識されているが、特に樹脂磁石の射出成形では、
樹脂磁石原料中に磁性粉を配合していることや、磁性粉
の磁場による磁気的配向度を向上させる理由から、射出
成形時の樹脂温度を高温に設定しているために、通常樹
脂を用いた射出成形に比べて金型の冷却能力が生産性に
及ぼす影響はより大きい。It is generally recognized that the cooling capacity of the mold has a great influence on the molding speed and is therefore important in the injection molding mold, but particularly in the injection molding of the resin magnet,
Since resin powder is mixed with magnetic powder and the magnetic orientation of the magnetic powder is improved by magnetic field, the resin temperature during injection molding is set to a high temperature. Compared with the conventional injection molding, the influence of the mold cooling capacity on the productivity is greater.
【００１０】本発明はかかる現況に鑑みてなされたもの
であり、冷却能力を高めることが可能で生産性を向上さ
せることができる樹脂マグネットロール用射出成形金型
を提供せんとするものである。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an injection molding die for a resin magnet roll, which can enhance the cooling capacity and improve the productivity.
【００１１】[0011]
【課題を解決するための手段】本発明者は、上記課題を
解決するにあたって鋭意検討した結果、キャビティ内空
間における径方向中心空間と外周空間に分け、両空間へ
の樹脂の流し込みを二段階に分けて行い、それぞれの空
間への樹脂の流し込み時にはそれぞれの空間に冷却部材
を接触させることができれば上記課題は解決しえるので
はないかとの着想のもと本発明を完成させたものであ
る。Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventor has divided a cavity inner space into a radial center space and an outer peripheral space, and pours resin into both spaces in two stages. The present invention has been completed based on the idea that the above problems can be solved if the cooling members can be brought into contact with the respective spaces when the resin is poured into the respective spaces.
【００１２】上記課題を解決した本発明の要旨は、樹脂
マグネットロール成形用のキャビティ内における径方向
外周空間に、当該空間を一時的に閉鎖する冷却コアをキ
ャビティ内外に出没可能に配置するとともに、冷却コア
がキャビティ内に存在するときのキャビティ内の残余の
空間を溶融樹脂磁石材料を最初に射出する一次射出空間
となし、一次射出完了後に冷却コアをキャビティ外に退
避させたときにキャビティ内に形成される残余の空間を
二次射出空間としてなることを特徴としている。The gist of the present invention, which has solved the above-mentioned problems, is to arrange a cooling core for temporarily closing the space in a radially outer space in a cavity for molding a resin magnet roll so that the cooling core can appear in and out of the cavity. When the cooling core exists inside the cavity, the remaining space inside the cavity is defined as the primary injection space for first injecting the molten resin magnet material, and when the cooling core is retracted out of the cavity after the completion of primary injection, it is placed inside the cavity. It is characterized in that the remaining space formed is used as a secondary injection space.
【００１３】キャビティ内外に出没可能に配置された冷
却コアが一時的に閉鎖する空間は径方向中心部となすこ
とも可能であり、この場合は径方向外周空間が一次射出
空間となり、径方向中心空間が二次射出空間となる。The space in which the cooling cores that can be retracted into and out of the cavity are temporarily closed may be the center part in the radial direction. In this case, the outer space in the radial direction serves as the primary injection space, and the center in the radial direction. The space becomes the secondary ejection space.
【００１４】冷却コアは冷却能力をより高めることが好
ましく、このために冷却コア内に冷却用水路を配設する
ことが望まれる。The cooling core preferably has a higher cooling capacity, and for this reason, it is desirable to dispose a cooling water channel in the cooling core.
【００１５】[0015]
【作用】このような射出成形金型を用いた樹脂マグネッ
トロールの成形は次のようにして行われる。ここでは、
キャビティ内の径方向外周空間を冷却コアが閉鎖する場
合を中心にして述べる。先ず、金型を型締めした初期状
態においてはキャビティ内の外周空間には冷却コアが存
在し、キャビティ内の外周空間は閉鎖状態となってキャ
ビティ内には一次射出空間が形成されている。この一次
射出空間に対し、一次射出用樹脂流入口から高温で溶融
した樹脂磁石原料が射出される。一次射出空間の外側に
は高冷却能を有する冷却コアが存在し、しかも一次射出
空間への樹脂磁石原料の射出容量は少ないので一次射出
空間に充填された樹脂磁石原料は早期に冷却されて固化
する。一次射出空間内の樹脂磁石原料が固化した段階
で、冷却コアをキャビティ外に退避させ、冷却コアの退
避によってキャビティ外周部に形成される二次射出空間
に二次射出用樹脂流入口より樹脂磁石原料を射出する。
二次射出空間の内周側には前記一次射出によって冷却固
化した樹脂磁石が既に存在し、他方外側にはキャビティ
内壁が存在するため冷却能力は高く、加えて二次射出空
間への射出容量は少ないので二次射出空間内の樹脂磁石
原料は早期に冷却されて固化する。このように二段階の
射出成形を経ることによって軸部一体型マグネットロー
ルが成形される。本発明は二段階の射出成形を経るもの
の各段階において樹脂磁石原料が冷却固化するまでの時
間は極めて短いので、全体の成形時間は大幅に短縮され
る。Function: Molding of the resin magnet roll using such an injection molding die is performed as follows. here,
The case where the cooling core closes the radially outer space in the cavity will be mainly described. First, in the initial state where the mold is clamped, the cooling core exists in the outer peripheral space inside the cavity, the outer peripheral space inside the cavity is closed, and the primary injection space is formed inside the cavity. The resin magnet raw material melted at a high temperature is injected into the primary injection space from the primary injection resin inlet. There is a cooling core with a high cooling capacity outside the primary injection space, and since the injection capacity of the resin magnet raw material into the primary injection space is small, the resin magnet raw material filled in the primary injection space is cooled early and solidified. To do. When the resin magnet raw material in the primary injection space is solidified, the cooling core is retracted to the outside of the cavity, and the resin magnet is injected from the resin injection port for secondary injection into the secondary injection space formed on the outer periphery of the cavity by the retracting of the cooling core. Inject raw materials.
The resin magnet cooled and solidified by the primary injection already exists on the inner peripheral side of the secondary injection space, while the cavity inner wall exists on the other outer side, so the cooling capacity is high, and the injection capacity into the secondary injection space is high. Since the amount is small, the resin magnet raw material in the secondary injection space is cooled and solidified at an early stage. In this way, the shaft portion-integrated magnet roll is molded by performing the two-step injection molding. Although the present invention undergoes two-step injection molding, the time required for the resin magnet raw material to be cooled and solidified in each step is extremely short, so that the entire molding time is significantly shortened.
【００１６】冷却コアをキャビティ内における径方向中
心部に位置づけた場合は、キャビティ内の径方向外周部
が一次射出空間となり、径方向中心部が二次射出空間と
なる。この場合、一次射出空間は内側を冷却コアによっ
て冷やされるとともに外側をキャビティ周壁によって冷
やされるため冷却速度が速く、また二次射出するときに
は二次射出空間の外側には、一次射出によって既に冷却
固化した樹脂磁石が存在し、加えて二次射出空間への射
出容量も一次射出と同様極めて少ないので冷却速度は速
い。When the cooling core is positioned at the center of the cavity in the radial direction, the outer periphery of the cavity in the radial direction becomes the primary injection space and the center of the radial direction becomes the secondary injection space. In this case, since the primary injection space is cooled by the cooling core on the inner side and is cooled by the cavity peripheral wall on the outer side, the cooling rate is fast, and when the secondary injection is performed, the outside of the secondary injection space is already cooled and solidified by the primary injection. Since the resin magnet exists and the injection capacity into the secondary injection space is extremely small as in the primary injection, the cooling rate is high.
【００１７】また、冷却コア内に冷却水路を設けたとき
には、冷却水路を流通する水によって冷却コアが冷やさ
れるので、樹脂磁石原料の冷却をより一層促進すること
ができ、冷却コアの容積が小さくても優れた冷却能を発
揮できる。Further, when the cooling water passage is provided in the cooling core, the cooling core is cooled by the water flowing through the cooling water passage, so that the cooling of the resin magnet raw material can be further promoted, and the volume of the cooling core is small. However, it can exhibit excellent cooling performance.
【００１８】[0018]
【実施例】次に本発明の詳細を図示した実施例に基づき
説明する。図１は第１発明の射出成形金型の一実施例を
示す端面説明図である。図中１はマグネットロールを成
形するためのキャビティ２を形成したキャビティ型であ
り、３は当該キャビティ型１に埋め込まれた配向用磁場
発生装置である。図中４はキャビティ２内における径方
向外周空間に配置された環状の冷却コアであり、当該冷
却コア４内には冷却水路５が形成されている。冷却コア
４は長手方向に進退することによってキャビティ２内外
に出没可能に構成されている。そして図２に示す如く冷
却コア４がキャビティ２内に存在するときにキャビティ
２内に形成される空間を、樹脂磁石原料を最初に射出す
る一次射出空間Ａ１とし、他方、図３に示す如く、一次
射出完了後に冷却コア４をキャビティ２外に退避させた
ときにキャビティ内壁と前記一次射出によって成形され
た一次成形体Ｂ１との間に形成される残余の空間を二次
射出空間Ａ２としている。冷却コア４のキャビティ２か
らの退避は、キャビティ型１から完全に抜き去るのでは
なく、図３に示すように先端側をキャビティ型１内に残
存させ、その先端面によって二次射出空間Ａ２の長手方
向端部を閉鎖するようにしている。図例の冷却コア４は
冷却能を高めるために内部に冷却水路５を形成している
が、冷却コア４の熱容量が大きければ冷却水路５は必ず
しも必要ではない。そして、一次射出空間Ａ１に対して
は一次射出用樹脂流入口ａ１が、また二次射出空間Ａ２
に対しては二次射出用樹脂流入口ａ２が設けられ、それ
ぞれの流入口を通じて各々の空間に溶融した樹脂磁石原
料を射出しうるように構成されている。尚、冷却コア４
は冷却能を高める観点からは熱容量が大きいことが好ま
しく、このためには図例の如く冷却コア４は外周空間を
完全に埋める体積を有するように設計し、その外周側は
キャビティ型１内壁と接触させることがことが好ましい
が、冷却コア４のキャビティ２内外への退避動作におい
て、キャビティ型１内壁との接触動作が好ましくない場
合は、冷却コア４の外周側とキャビティ型１内壁間に若
干の空隙を形成してもよい。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to illustrated embodiments. FIG. 1 is an end face explanatory view showing an embodiment of an injection molding die of the first invention. In the drawing, 1 is a cavity mold in which a cavity 2 for molding a magnet roll is formed, and 3 is a magnetic field generator for orientation embedded in the cavity mold 1. Reference numeral 4 in the drawing denotes an annular cooling core arranged in the radially outer space in the cavity 2, and a cooling water passage 5 is formed in the cooling core 4. The cooling core 4 is configured to be able to move in and out of the cavity 2 by advancing and retracting in the longitudinal direction. Then, as shown in FIG. 2, the space formed in the cavity 2 when the cooling core 4 is present in the cavity 2 is defined as a primary injection space A1 for first injecting the resin magnet raw material, and on the other hand, as shown in FIG. A secondary injection space A2 is a residual space formed between the inner wall of the cavity and the primary molded body B1 molded by the primary injection when the cooling core 4 is retracted outside the cavity 2 after the completion of the primary injection. The evacuation of the cooling core 4 from the cavity 2 does not completely remove it from the cavity mold 1, but the tip side is left inside the cavity mold 1 as shown in FIG. The longitudinal ends are closed. The cooling core 4 in the illustrated example has a cooling water passage 5 formed therein in order to enhance the cooling capacity, but the cooling water passage 5 is not always necessary if the heat capacity of the cooling core 4 is large. The primary injection resin inflow port a1 is provided for the primary injection space A1, and the secondary injection space A2 is provided.
Is provided with a secondary injection resin inlet a2, and the molten resin magnet raw material can be injected into each space through each inlet. The cooling core 4
Has a large heat capacity from the viewpoint of enhancing the cooling capacity. For this purpose, the cooling core 4 is designed to have a volume that completely fills the outer peripheral space as shown in the figure, and the outer peripheral side of the cooling core 4 is the inner wall of the cavity mold 1. It is preferable to bring them into contact with each other, but in the retracting operation of the cooling core 4 into and out of the cavity 2, if the contact operation with the inner wall of the cavity mold 1 is not preferable, there is a slight gap between the outer peripheral side of the cooling core 4 and the inner wall of the cavity mold 1. Voids may be formed.
【００１９】このような構成の射出成形金型は次のよう
にして使用される。先ず、金型を型締めした初期状態に
おいては配向用磁場発生装置３により発生させた磁場が
印加状態となっているキャビティ２内において、図２に
示す如く外周空間に冷却コア４が位置づけられ、キャビ
ティ２内には一次射出空間Ａ１が形成されている。この
一次射出空間Ａ１に対し、図４に示す如く一次射出用樹
脂流入口ａ１を通じて溶融した樹脂磁石原料が射出され
る。樹脂磁石原料は磁石粉を磁場配向しやすくするため
に流動性を高める必要があり、通常の射出成形に用いる
樹脂よりも高い温度で溶融させている。一次射出空間Ａ
１の外側には、冷却コア４が配置されているので、当該
空間に射出された樹脂磁石原料は冷却コア４によって冷
やされ外周部から冷却固化が始まる。冷却コア４には冷
却水路５が形成されているため冷却能が高く、しかも一
次射出空間Ａ１への射出容量は、マグネットロール全体
を一回の射出で成形する際の射出容量に比べてはるかに
少ないので一次射出空間に充填された樹脂磁石原料は早
期に冷却固化させることができる。The injection molding die having such a structure is used as follows. First, in the cavity 2 to which the magnetic field generated by the orientation magnetic field generator 3 is applied in the initial state where the mold is clamped, the cooling core 4 is positioned in the outer peripheral space as shown in FIG. A primary injection space A1 is formed in the cavity 2. The molten resin magnet raw material is injected into the primary injection space A1 through the primary injection resin inlet a1 as shown in FIG. The resin magnet raw material needs to have high fluidity in order to easily orient the magnet powder in the magnetic field, and is melted at a temperature higher than that of the resin used for normal injection molding. Primary injection space A
Since the cooling core 4 is arranged on the outer side of 1, the resin magnet raw material injected into the space is cooled by the cooling core 4 and starts cooling and solidification from the outer peripheral portion. Since the cooling water passage 5 is formed in the cooling core 4, the cooling capacity is high, and the injection capacity into the primary injection space A1 is much larger than the injection capacity when the entire magnet roll is molded by one injection. Since the amount is small, the resin magnet raw material with which the primary injection space is filled can be cooled and solidified at an early stage.
【００２０】一次射出空間Ａ１内の樹脂磁石原料が冷却
固化したならば、図５に示すように冷却コア４をキャビ
ティ２外に退避させ、この退避動作によってキャビティ
内の外周部に出現した二次射出空間Ａ２に二次射出用樹
脂流入口ａ２を通じて図６に示すように樹脂磁石原料を
射出する。二次射出空間Ａ２の外側にはキャビティ内
壁、即ち成形面が存在し、他方、二次射出空間Ａ２の内
側には前記一次射出によって既に冷却硬化した樹脂磁石
体が存在するので、当該空間に充填された樹脂磁石原料
は内面と外面の両方から冷やされ、急速に冷却されて固
化する。キャビティ型１内にはキャビティ２に近接して
配向用磁場発生装置３が組み込まれ、キャビティ壁は薄
くなっているためキャビティ内壁の冷却能力は前記冷却
コア４が存在する場合に比べて劣っているものの、二次
射出空間Ａ２への射出容量は少ないことから二次射出空
間Ａ２内の樹脂磁石原料の冷却固化も迅速に行われる。When the resin magnet raw material in the primary injection space A1 is cooled and solidified, the cooling core 4 is retracted to the outside of the cavity 2 as shown in FIG. The resin magnet raw material is injected into the injection space A2 through the secondary injection resin inlet a2 as shown in FIG. The inner wall of the cavity, that is, the molding surface exists outside the secondary injection space A2, while the resin magnet body that has already been cooled and hardened by the primary injection exists inside the secondary injection space A2. The resin magnet raw material thus cooled is cooled from both the inner surface and the outer surface, and is rapidly cooled and solidified. The orientation magnetic field generator 3 is incorporated in the cavity mold 1 in the vicinity of the cavity 2 and the cavity wall is thin, so the cooling capacity of the cavity inner wall is inferior to the case where the cooling core 4 is present. However, since the injection capacity into the secondary injection space A2 is small, the resin magnet raw material in the secondary injection space A2 can be rapidly cooled and solidified.
【００２１】図７はこのような手順により作製されたマ
グネットロールを示し、（イ）は軸方向断面図であり、
（ロ）は径方向断面図である。マグネットロールＭは一
次射出によって作製された一次成形体Ｂ１の外側に二次
射出によって作製した二次成形体Ｂ２が一体的に形成さ
れた構成となる。通常は一次成形体Ｂ１と二次成形体Ｂ
２には同じ樹脂磁石原料を用いるが、要求される冷却速
度や磁気特性、更には機械的強度等を考慮して一次成形
体Ｂ１と二次成形体Ｂ２とでその樹脂磁石原料を変える
ことも可能である。例えば多量の磁性粉が充填可能な軟
質合成樹脂を外層部を構成する二次成形体Ｂ２の樹脂バ
インダーとして用い、他方、軸芯部に位置する一次成形
体Ｂ１には機械的強度を高める目的から硬質合成樹脂バ
インダーを用いることなどが採用できる。また、軸芯部
に位置する一次成形体Ｂ１の合成樹脂バインダーとして
溶融温度の低いものを用い冷却固化時間の一層の短縮化
をはかってもよい。またマグネットロール中心部と表面
部との間には距離があることから、マグネットロール中
心部に位置する樹脂磁石原料のもつ磁力はマグネットロ
ールの表面磁力強化にほとんど貢献しないという事実を
積極的に利用して、軸芯部を構成する一次成形体Ｂ１の
素材には磁性粉を含有しない単なる合成樹脂材料を用い
ることも考慮される。この場合、磁性粉の分散性等を考
慮する必要がないことから一次成形体Ｂ１の素材選定の
幅は広がり、その素材選択はコストや冷却速度等を中心
課題にして行うことができる。FIG. 7 shows a magnet roll manufactured by such a procedure, (a) is an axial sectional view,
(B) is a radial cross-sectional view. The magnet roll M has a structure in which a secondary molded body B2 manufactured by secondary injection is integrally formed outside the primary molded body B1 manufactured by primary injection. Usually, the primary compact B1 and the secondary compact B
The same resin magnet raw material is used for 2, but the resin magnet raw material may be changed between the primary molded body B1 and the secondary molded body B2 in consideration of the required cooling rate, magnetic characteristics, and mechanical strength. It is possible. For example, a soft synthetic resin that can be filled with a large amount of magnetic powder is used as a resin binder of the secondary molded body B2 that constitutes the outer layer portion, while the primary molded body B1 located at the shaft core portion has the purpose of increasing the mechanical strength. The use of a hard synthetic resin binder can be adopted. Further, as the synthetic resin binder of the primary molded body B1 located at the shaft core, one having a low melting temperature may be used to further shorten the cooling and solidifying time. In addition, since there is a distance between the center of the magnet roll and the surface, the fact that the magnetic force of the resin magnet raw material located in the center of the magnet roll does not contribute to strengthening the surface magnetic force of the magnet roll is actively utilized. Then, it is also considered to use a simple synthetic resin material containing no magnetic powder as the material of the primary molded body B1 forming the shaft core portion. In this case, since it is not necessary to consider the dispersibility of the magnetic powder and the like, the range of selection of the raw material of the primary molded body B1 is widened, and the raw material selection can be made mainly by cost, cooling rate and the like.
【００２２】上記実施例はキャビティ２内の外周部に冷
却コアを位置づけた場合であるが、冷却コアはキャビテ
ィ２内の中心空間に位置づけてもよい。図８がこの実施
例である。即ち、内部に冷却水路６を形成した冷却コア
７がキャビティ２内外に進退可能な状態でキャビティ２
内中心空間に位置づけられている。冷却コア７が占める
空間は成形後のマグネットロールにおける軸部となるこ
とから、冷却コア７の外径は成形後のマグネットロール
の軸部径とほぼ一致させ、且つその退避位置もこのこと
を考慮して設定されている。In the above embodiment, the cooling core is positioned on the outer peripheral portion of the cavity 2, but the cooling core may be positioned in the central space of the cavity 2. FIG. 8 shows this embodiment. That is, the cooling core 7 having the cooling water passage 6 formed therein can move forward and backward in and out of the cavity 2.
It is located in the inner central space. Since the space occupied by the cooling core 7 is the shaft portion of the magnet roll after molding, the outer diameter of the cooling core 7 is made to substantially match the shaft diameter of the magnet roll after molding, and the retracted position is also taken into consideration. Has been set.
【００２３】このような構成の射出成形金型は、図９に
示す如くキャビティ２内中心空間に冷却コア７が存在す
る状態でのキャビティ２内の外周空間が一次射出空間Ａ
１´となり、他方、図１０に示すようにキャビティ２内
外周空間に一次成形体Ｂ１´が形成された後に冷却コア
７をキャビティ２外に退避させたときに形成されるキャ
ビティ２内中心空間を二次射出空間Ａ２´とする以外
は、前記実施例とほぼ同様に使用される。この場合、キ
ャビティ２内外周空間が先に成形され、キャビティ２内
中心空間は後で成形されることになるが、マグネットロ
ールの表面磁力形成にとって重要なのは前述したように
キャビティ２内外周空間に成形される一次成形体Ｂ１´
であるので、一次成形体用材料については成形着磁後の
磁気特性を考慮したうえその樹脂磁石原料の選定を行
い、他方マグネットロールの軸部を形成する二次成形体
Ｂ２´の材料としては磁気特性よりも冷却速度や機械的
強度を中心にした材料選定ができることは前記実施例と
同様である。In the injection molding die having such a structure, as shown in FIG. 9, the outer peripheral space inside the cavity 2 in the state where the cooling core 7 exists in the central space inside the cavity 2 is the primary injection space A.
On the other hand, as shown in FIG. 10, on the other hand, the central space inside the cavity 2 formed when the cooling core 7 is retracted to the outside of the cavity 2 after the primary molded body B1 ′ is formed inside the cavity 2 is formed. Except for the secondary injection space A2 ', it is used in substantially the same manner as in the above embodiment. In this case, the inner and outer peripheral spaces of the cavity 2 are formed first, and the central space of the cavity 2 is formed later. However, it is important to form the surface magnetic force of the magnet roll in the inner and outer peripheral spaces of the cavity 2 as described above. Primary molded body B1 '
Therefore, regarding the material for the primary molded body, the resin magnet raw material is selected in consideration of the magnetic characteristics after molding and magnetization, and on the other hand, as the material for the secondary molded body B2 ′ that forms the shaft portion of the magnet roll, Similar to the above-described embodiment, the material can be selected mainly by the cooling rate and the mechanical strength rather than the magnetic characteristics.
【００２４】[0024]
【発明の効果】本発明はキャビティ内空間を径方向中心
空間と外周空間とに分け、両空間への樹脂の流し込みを
一次射出と二次射出の二段階に分けて行うこととし、二
次射出空間には冷却コアをキャビティ内外に出没可能な
状態で設けた構成とすることによって、一次射出空間及
び二次射出空間の容積を小さくするとともにそれぞれの
空間に射出された樹脂磁石材料が早期に冷却されるよう
にしたので、樹脂マグネットロールの成形サイクルを速
めることが可能となり、生産性を高めることができる。
また、本発明では径方向中心部と外周部とを異種材料を
用いて成形することも可能であり、したがって、マグネ
ットロールの表面磁力に影響しないマグネットロール軸
芯部分の材料選択に際しては磁気特性を配慮する必要が
なくなり、選択の幅も広がる。そして、軸芯部分の樹脂
材料として硬化速度の速いものを選択することにより、
マグネットロール全体の生産性はより一層向上する。According to the present invention, the cavity inner space is divided into the radial center space and the outer peripheral space, and the resin is poured into both the spaces in two stages of primary injection and secondary injection. By configuring the space so that the cooling core can be set in and out of the cavity, the volume of the primary injection space and the secondary injection space can be reduced and the resin magnet material injected into each space can be cooled quickly. Since this is done, the molding cycle of the resin magnet roll can be accelerated and the productivity can be improved.
Further, in the present invention, it is possible to form the radial center portion and the outer peripheral portion using different materials, and therefore, when selecting the material of the magnet roll shaft core portion that does not affect the surface magnetic force of the magnet roll, the magnetic characteristics are You don't have to worry about it, and you have more choices. Then, by selecting a resin material with a high curing speed as the resin material of the shaft core,
The productivity of the entire magnet roll is further improved.
【図１】本発明の樹脂マグネットロール用射出成形金型
の第１実施例を示し、キャビティ内外周側に位置づけた
環状の冷却コアが移動する様子を示す端面説明図FIG. 1 is an end face explanatory view showing a first embodiment of an injection molding die for a resin magnet roll of the present invention, showing a state where an annular cooling core positioned on the inner and outer peripheral sides of a cavity moves.
【図２】同第１実施例において一次射出前の金型の状態
を示す端面説明図FIG. 2 is an end face explanatory view showing the state of the mold before the primary injection in the first embodiment.
【図３】同第１実施例において一次射出完了後、冷却コ
アを退避させて一次成形体の外周側に二次射出空間を形
成した状態を示す端面説明図FIG. 3 is an end face explanatory view showing a state in which after the completion of primary injection in the first embodiment, the cooling core is retracted to form a secondary injection space on the outer peripheral side of the primary molded body.
【図４】同第１実施例において一次射出直後の状態を示
す端面説明図FIG. 4 is an end face explanatory view showing a state immediately after primary injection in the first embodiment.
【図５】同第１実施例において固化した一次成形体の外
周側に二次射出空間を形成した状態を示す端面説明図FIG. 5 is an end face explanatory view showing a state where a secondary injection space is formed on the outer peripheral side of the solidified primary molded body in the first embodiment.
【図６】同第１実施例において一次射出及び二次射出が
共に完了し、一次成形体と二次成形体の二層成形体が形
成された状態を示す端面説明図FIG. 6 is an end face explanatory view showing a state in which both the primary injection and the secondary injection have been completed in the first embodiment and a two-layer molded product of the primary molded product and the secondary molded product has been formed.
【図７】本発明の射出成形金型によって成形されたマグ
ネットロールの形状を示し、（イ）は軸方向断面図、
（ロ）は径方向断面図FIG. 7 shows a shape of a magnet roll molded by an injection molding die of the present invention, (a) is an axial sectional view,
(B) is a radial cross-sectional view
【図８】本発明の樹脂マグネットロール用射出成形金型
の第２実施例を示し、キャビティ内中心部に位置づけた
冷却コアが移動する様子を示す端面説明図FIG. 8 is an end face explanatory view showing a second embodiment of the resin magnet roll injection molding die of the present invention and showing how the cooling core positioned in the center of the cavity moves.
【図９】同第２実施例において一次射出が完了し一次成
形体が固化した状態を示す端面説明図FIG. 9 is an end face explanatory view showing a state where the primary injection is completed and the primary molded body is solidified in the second embodiment.
【図１０】同第２実施例において一次射出及び二次射出
が共に完了し、一次成形体と二次成形体の二層成形体が
形成された状態を示す端面説明図FIG. 10 is an end face explanatory view showing a state in which both the primary injection and the secondary injection have been completed and a two-layer molded product of a primary molded product and a secondary molded product has been formed in the second embodiment.
【図１１】樹脂マグネットロールの外観を示す斜視図FIG. 11 is a perspective view showing the appearance of a resin magnet roll.
【図１２】従来の樹脂マグネットロール用射出成形金型
を示す端面説明図FIG. 12 is an end face explanatory view showing a conventional injection mold for a resin magnet roll.
Ａ１ 一次射出空間 Ａ２ 二次射出空間 ａ１ 一次射出用樹脂流入口 ａ２ 二次射出用樹脂流入口 Ｂ１ 一次成形体 Ｂ２ 二次成形体 Ａ１´一次射出空間 Ａ２´二次射出空間 Ｂ１´一次成形体 Ｂ２´二次成形体 １ キャビティ型 ２ キャビティ ３ 配向用磁場発生装置 ４ 冷却コア ５ 冷却水路 ６ 冷却水路 ７ 冷却コア A1 primary injection space A2 secondary injection space a1 primary injection resin inlet a2 secondary injection resin inlet B1 primary molded body B2 secondary molded body A1 'primary injection space A2' secondary injection space B1 'primary molded body B2 ′ Secondary molded body 1 Cavity type 2 Cavity 3 Orientation magnetic field generator 4 Cooling core 5 Cooling water channel 6 Cooling water channel 7 Cooling core
Claims (3)
ィ内における径方向外周空間に、当該空間を一時的に閉
鎖する冷却コアをキャビティ内外に出没可能に配置する
とともに、冷却コアがキャビティ内に存在するときのキ
ャビティ内の残余の空間を溶融樹脂磁石材料を最初に射
出する一次射出空間となし、一次射出完了後に冷却コア
をキャビティ外に退避させたときにキャビティ内に形成
される残余の空間を二次射出空間としてなる樹脂マグネ
ットロール用射出成形金型。1. When a cooling core for temporarily closing the space is disposed in a radially outer space in a cavity for molding a resin magnet roll so that the cooling core can be retracted into and out of the cavity, and the cooling core exists in the cavity. The remaining space inside the cavity is defined as the primary injection space for first injecting the molten resin magnet material, and the residual space formed inside the cavity when the cooling core is retracted outside the cavity after the primary injection is completed is secondary. Injection mold for resin magnet rolls that serves as an injection space.
ィ内における径方向中心空間に、当該空間を一時的に閉
鎖する冷却コアをキャビティ内外に出没可能に配置する
とともに、冷却コアがキャビティ内に存在するときのキ
ャビティ内の残余の空間を溶融樹脂磁石材料を最初に射
出する一次射出空間となし、一次射出完了後に冷却コア
をキャビティ外に退避させたときにキャビティ内に形成
される残余の空間を二次射出空間としてなる樹脂マグネ
ットロール用射出成形金型。2. When a cooling core that temporarily closes the space is arranged in a radial center space in a cavity for molding a resin magnet roll so as to be able to project in and out of the cavity, and the cooling core exists in the cavity. The remaining space inside the cavity is defined as the primary injection space for first injecting the molten resin magnet material, and the residual space formed inside the cavity when the cooling core is retracted outside the cavity after the primary injection is completed is secondary. Injection mold for resin magnet rolls that serves as an injection space.
請求項１又は２記載の樹脂マグネットロール用射出成形
金型。3. The injection mold for a resin magnet roll according to claim 1 or 2, wherein a cooling water passage is provided in the cooling core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24272492A JP3304411B2 (en) | 1992-08-18 | 1992-08-18 | Injection mold for resin magnet roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24272492A JP3304411B2 (en) | 1992-08-18 | 1992-08-18 | Injection mold for resin magnet roll |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0664001A true JPH0664001A (en) | 1994-03-08 |
| JP3304411B2 JP3304411B2 (en) | 2002-07-22 |
Family
ID=17093309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24272492A Expired - Fee Related JP3304411B2 (en) | 1992-08-18 | 1992-08-18 | Injection mold for resin magnet roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3304411B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11138562A (en) * | 1997-11-14 | 1999-05-25 | Kanegafuchi Chem Ind Co Ltd | Mold for magnet roll |
| JP2006248027A (en) * | 2005-03-10 | 2006-09-21 | Canon Chemicals Inc | Apparatus for injection-molding magnet roller and method for producing magnet roller |
| JP2009098327A (en) * | 2007-10-16 | 2009-05-07 | Kaneka Corp | Magnet roller |
| CN112536995A (en) * | 2020-11-19 | 2021-03-23 | 杨慧 | Mould advances mucilage binding and puts for work piece production |
-
1992
- 1992-08-18 JP JP24272492A patent/JP3304411B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11138562A (en) * | 1997-11-14 | 1999-05-25 | Kanegafuchi Chem Ind Co Ltd | Mold for magnet roll |
| JP2006248027A (en) * | 2005-03-10 | 2006-09-21 | Canon Chemicals Inc | Apparatus for injection-molding magnet roller and method for producing magnet roller |
| JP4608343B2 (en) * | 2005-03-10 | 2011-01-12 | キヤノン化成株式会社 | Magnet roller injection molding apparatus and magnet roller manufacturing method |
| JP2009098327A (en) * | 2007-10-16 | 2009-05-07 | Kaneka Corp | Magnet roller |
| CN112536995A (en) * | 2020-11-19 | 2021-03-23 | 杨慧 | Mould advances mucilage binding and puts for work piece production |
| CN112536995B (en) * | 2020-11-19 | 2022-09-06 | 佛山市南海区百兴玩具有限公司 | Mould advances mucilage binding and puts for work piece production |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3304411B2 (en) | 2002-07-22 |
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