JP3820480B2 - A pair of shafts and resin bearing parts and method of manufacturing the same - Google Patents
A pair of shafts and resin bearing parts and method of manufacturing the same Download PDFInfo
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- JP3820480B2 JP3820480B2 JP2001242555A JP2001242555A JP3820480B2 JP 3820480 B2 JP3820480 B2 JP 3820480B2 JP 2001242555 A JP2001242555 A JP 2001242555A JP 2001242555 A JP2001242555 A JP 2001242555A JP 3820480 B2 JP3820480 B2 JP 3820480B2
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- shaft
- electroformed
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- shafts
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Description
【0001】
【発明の属する技術分野】
本発明は、樹脂製軸受部品の軸孔に軸部品を嵌合して、両者が相対的に回転又は摺動又は摺動回転できるように、係合支持する一対の軸と樹脂製軸受部品及びその製造方法に係るものであって、特に高精密な回転又は摺動又は摺動回転を必要とする一対の軸と樹脂製軸受部品及びその製造方法に好適である。
【0002】
【従来の技術】
この種の樹脂製軸受部品は、軽量で慣性力が小さいことや大量生産が可能であること等の理由から、歯車やカムなどを含む一般的な軸受部品から、センサーやポテンショメータ或いはアクチュエータ等の高精密部品の軸受部に至るまで幅広く利用されている。
【0003】
これら高精密部品の中でも、例えば光学式情報記録再生装置で光学的ピックアップを行うレンズホルダ等における軸受部の場合には、精密な真円度及び内径寸法精度が必要であって、軸とのクリアランスを数μ以下にすることが要求されており、また負荷荷重に対する高い機械的強度と摺動性も必要である。
【0004】
ところが、射出成形した樹脂製軸受部品をそのまま使用した場合、熱収縮や配向性などによって精密な真円度及び内径寸法精度が得られないと共に、ウエルドラインによって機械的強度が低下するので、成形品の内周面にアルミ合金製などのスリーブを装着したり、潤滑性樹脂パイプをインサートモールドしていた。
【0005】
【発明が解決しようとする課題】
しかしながら、アルミ合金製などのスリーブや潤滑性樹脂パイプを使用する場合には、精密な真円度及び内径寸法精度を得るために、精密な切削加工や研磨を行う必要があり、コスト高になると共に生産性が低下するなど、解決を必要とする課題があった。
【0006】
そこで本発明は、これら従来技術の課題を解決し得る一対の軸と樹脂製軸受部品及びその製造方法を提案するが、樹脂製軸受部品の軸孔内周面に筒状の電鋳部をインサートモールドで一体成形し、軸孔に軸部品を装着した一対の軸と樹脂製軸受部品とその製造方法であって、特に高精密な回転又は摺動又は摺動回転を必要とする軸受部に好適である。
【0007】
【課題を解決するための手段】
本発明による一対の軸と樹脂製軸受部品は、軸受部品の軸孔に適合するマスター軸から成形後に分離した電鋳殻である筒状の電鋳部が、樹脂成形部の軸心にインサートモールドで一体成形されて樹脂製軸受部品を構成すると共に、軸孔には電鋳殻から分離した前記マ スター軸が軸部品として装着されている。
【0008】
この一対の軸と樹脂製軸受部品によると、電鋳殻である電鋳部の内周面が軸受部品の軸孔を形成するので、真円度及び内径寸法精度が高くて摺動性も良好であり、研磨などの後処理を格別に行う必要がなく、電鋳部の内周面に装着させて使用する軸部品に対するクリアランスを極小にして高精密な回転又は摺動又は摺動回転を可能にすると共に、電鋳部の外周面に対する樹脂成形部の付着力が良好である。
【0009】
本発明による一対の軸と樹脂製軸受部品の製造方法は、軸孔に適合する筒状の電鋳部をマスター軸の外周に設けた電鋳軸を造る工程と、この電鋳軸を金型内に装着して射出成形を行い、軸心に電鋳軸をインサートした樹脂成形品を造る工程と、この樹脂成形品からマスター軸を分離し、軸孔に電鋳殻である筒状の電鋳部を一体形成した軸受部品にする工程と、樹脂成形品から分離したマスター軸を、軸受部品の電鋳部に装着して軸部品に使用する工程とを備えている。
【0010】
この一対の軸と樹脂製軸受部品の製造方法によると、電鋳部をマスター軸と一体で金型内に装着した状態で射出成形が行われるので、電鋳部を位置決め精度良く容易にインサートして一体成形できると共に、マスター軸を分離した電鋳殻である電鋳部の内周面が軸受部品の軸孔を形成するので、真円度及び内径寸法精度の高い樹脂製軸受部品が得られる。
【0011】
(削除)
【0012】
上記した一対の軸と樹脂製軸受部品及びその製造方法では、樹脂成形品から分離したマスター軸を、軸受部品の電鋳部に装着して軸部品として使用する形態を採ることができ、これによって軸と軸孔のクリアランスがより少なくなるので、高精密な回転又は摺動又は摺動回転を必要とする軸と軸受部に好適である。
【0013】
【発明の実施の形態】
以下に、本発明による一対の軸と樹脂製軸受部品とその製造方法に付いて、好適な実施形態を示す図1〜4の添付図面に基づいて詳細に説明すると、図1で示すように電鋳マスターとなるマスター軸1を用い、マスター軸1の非電鋳部2をマスキングした状態で電鋳加工を施し、筒状の電鋳部3を設けた電鋳軸4を造る。
【0014】
マスター軸1には、剛性などの機械的強度が大きくて摺動性も良く、耐熱性や耐薬品性にも優れた材質で形成されるが、図示の実施形態では、焼き入れ処理を施したステンレス鋼でストレートの円柱状に形成したむく軸を使用しており、ステンレス鋼のなかでも特にSUS420Jなどの使用が望ましい。
【0015】
マスター軸1の材質は、ステンレス鋼に限定されるものではなく、同等の性能を有して電鋳部3の加工及び電鋳の分離ができる他の材質の使用も可能であり、例えばニッケルクロム鋼その他のニッケル合金やクロム合金などの硬質金属材や、セラミックの表面に硬質金属被膜を施したものなども使用可能である。
【0016】
マスター軸1の形状は、むく軸だけではなく中空軸や中空部に樹脂材を埋め込んだ中実軸の形態を採ることも可能であり、また樹脂製軸受部品が摺動軸の場合には、横断面が一定ならば多角形状その他の非円形状の形態もあり、更に樹脂製軸受部品の用途によっては、軸の全長に渡って一定の横断面形状ではない形態を採ることも可能である。
【0017】
非電鋳部2のマスキングは、レジスト処理や絶縁材入りインクをシルク印刷して、非電鋳部2の外周面に対して耐酸性及び非伝導性の被覆材を添着させ、電鋳処理する際にマスター軸1の電鋳部3のみに作用させる保護被膜を形成する。
【0018】
電鋳部3には、公知の電鋳加工と同様に各種の電鋳金属の使用が可能であるが、図示の実施形態ではマスター軸1と同じステンレス材を用い、マスター軸1からの分離を容易にするために、カーボンなどの摺動材及びサッカリンなどの応力緩和剤を含有させており、電鋳の厚みは略0.2〜0.3mm程度である。
【0019】
なお、マスター軸1に電鋳加工を施した際に、電鋳部3の両端側は非電鋳部2に迫り出し、内周面にテーパ状の面取り部3aが自然に形成されるが、この面取り部3aはマスター軸1から電鋳部3を分離させる際や、軸受部品13の電鋳部3内周面に装着させて使用する軸部品を着脱させる際に役立つ。
【0020】
すなわち、マスター軸1から電鋳部3を分離させる際には、例えば高温又は低温の高圧エアーを接合部分に吹き付けるなどして両者の熱収縮率の差を利用したり、軸方向に打撃を加えたりするが、高圧エアーを吹き付けるのに面取り部3aは都合が良く、また軸部品を着脱させる際にはガイドとして作用する。
【0021】
次に、図2で示すように上型5と下型6とを備えた射出成形金型のキャビティ10内に、コアロッドの代わりに電鋳軸4をインサートさせた状態にし、スプール7とランナー8及びゲート9を介して、液晶ポリマー(LCP)などによる樹脂材を注入して射出成形を行う。
【0022】
なお、樹脂材として液晶ポリマー(LCP)の他に、ポリフェニレンサルファイド(PPS)樹脂、ポリアセタール樹脂、ポリアミド樹脂などの結晶性ポリマー、これら以外でも同様の機能を発揮する高機能樹脂材を使用することが可能であり、必要に応じて繊維強化剤や潤滑剤となる添加剤を加えても良い。
【0023】
これにより、図3で示すように電鋳軸4と樹脂成形部11が一体になった樹脂成形品12が得られ、樹脂成形品12から電鋳軸4を引き抜くと、図4で示すように電鋳部3は樹脂成形部11の軸孔内周面に付着した状態で電鋳殻として残余され、非電鋳部2にマスキングしたマスター軸1のみが分離する。
【0024】
従って、図4で示すように、樹脂成形部11の軸孔内周面に電鋳殻である電鋳部3が一体形成された軸受部品13を得ることができるが、この軸受部品13の軸孔内周面は、マスター軸1の外周面に適合した寸法精度が高いものであり、分離したマスター軸1は軸孔内に装着して一対の軸部品として使用が可能である。
【0025】
また電鋳部3は、電鋳の基本的性質から外周面が粗面で内周面が円滑面に形成されるので、電鋳部3外周面に対する樹脂成形部11の軸孔内周面の付着力が良好であると共に、軸受部品13の電鋳部3内周面に装着させて使用する軸部品であるマスター軸1に対する摺動性も良好であり、研磨などの後処理を格別に行う必要がない。
【0026】
(削除)
【0027】
(削除)
【0028】
以上の実施形態による一対の軸と樹脂製軸受部品及びその製造方法の場合には、電鋳部3をマスター軸1と一体にして射出成形が行われるので、電鋳部3を位置決め精度良く容易にインサートできること、また電鋳軸4をそのまま軸受部品13の軸部品として1セットで使用するので、軸部品と軸孔とのクリアランスが小さい製品が得られる。
【0029】
仮に、軸孔に電鋳加工を施した軸受部品を従来技術で製造する場合には、予め射出成形した樹脂成形部の軸孔に後で電鋳加工を施すことになり、この場合には軸孔内に電極を配置させたり、非電鋳部をマスキングすること、軸孔内に均一で一定の電鋳を施すこと、などが極めて困難であるから実用に供しないところを、本発明では以上に説明した手段を用いることによって実用を可能にした。
【図面の簡単な説明】
【図1】 本発明を適用した一対の軸と樹脂製軸受部品及びその製造方法に使用するマスター軸(a)と電鋳軸(b)の正面図。
【図2】 図1の電鋳軸をインサートして行われる射出成形の模式的な要部縦断面図。
【図3】 図2の射出成形で得られる電鋳軸と樹脂成形部が一体になった樹脂成形品の縦断面図。
【図4】 図3の樹脂成形品からマスター軸のみを分離して電鋳部付きの軸受部品を得る分離工程の縦断面図。
【符号の説明】
1 マスター軸
2 非電鋳部(マスキング)
3 電鋳部
4 電鋳軸
5 上型
6 下型
7 スプール
8 ランナー
9 ゲート
10 キャビティ
11 樹脂成形部
12 樹脂成形品
13 軸受部品[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pair of shafts and resin bearing parts that are engaged and supported so that the shaft parts are fitted in the shaft holes of the resin bearing parts so that both can rotate or slide or slide and rotate relative to each other. It relates to the manufacturing method , and is particularly suitable for a pair of shafts and resin bearing parts that require highly precise rotation or sliding or sliding rotation, and a manufacturing method thereof .
[0002]
[Prior art]
This type of resin bearing parts is light and has low inertia, mass production, etc., and so on, from general bearing parts including gears and cams, sensors, potentiometers, actuators, etc. Widely used in bearings for precision parts.
[0003]
Among these high precision components, for example, in the case of a bearing portion in a lens holder that performs optical pickup with an optical information recording / reproducing apparatus, precise roundness and inner diameter dimensional accuracy are required, and clearance from the shaft is required. Is required to be several μm or less, and high mechanical strength and slidability with respect to a load are also required.
[0004]
However, when an injection-molded resin bearing part is used as it is, precise roundness and inner diameter dimensional accuracy cannot be obtained due to heat shrinkage and orientation, and the mechanical strength is lowered by the weld line. A sleeve made of an aluminum alloy or the like was attached to the inner peripheral surface of the resin, or a lubricating resin pipe was insert molded.
[0005]
[Problems to be solved by the invention]
However, when using a sleeve made of an aluminum alloy or a lubrication resin pipe, it is necessary to perform precise cutting and polishing in order to obtain precise roundness and dimensional accuracy, resulting in high costs. At the same time, there is a problem that needs to be solved, such as a decrease in productivity.
[0006]
Therefore, the present invention proposes a pair of shafts and a resin bearing part that can solve the problems of the prior art and a method for manufacturing the same , and inserts a cylindrical electroformed part on the inner peripheral surface of the shaft hole of the resin bearing part. A pair of shafts that are integrally molded with a mold and mounted with shaft components in a shaft hole, a resin bearing component, and a method for manufacturing the same, especially for bearing portions that require high-precision rotation or sliding or sliding rotation Is preferred.
[0007]
[Means for Solving the Problems]
A pair of shafts and a resin bearing part according to the present invention are formed by inserting a cylindrical electroformed part, which is an electroformed shell separated from a master shaft that fits into the shaft hole of the bearing part, into an axis of the resin molded part. in is integrally molded with the constituting resin bearing parts, the master shaft separated from the electrodeposition Ikara shaft hole is mounted as a shaft part.
[0008]
According to this pair of shafts and resin bearing parts, the inner peripheral surface of the electroformed part, which is an electroformed shell, forms the shaft hole of the bearing part, so that the roundness and the inner diameter dimensional accuracy are high and the slidability is also good. There is no need for special post-processing such as polishing, and high precision rotation or sliding or sliding rotation is possible by minimizing the clearance for the shaft parts used by mounting on the inner peripheral surface of the electroformed part. In addition, the adhesion of the resin molded part to the outer peripheral surface of the electroformed part is good.
[0009]
A method for manufacturing a pair of shafts and a resin bearing part according to the present invention includes a step of manufacturing an electroformed shaft having a cylindrical electroformed portion adapted to a shaft hole provided on an outer periphery of a master shaft, and the electroformed shaft is a mold. A process for producing a resin molded product in which an electroformed shaft is inserted into the shaft center, injection molding is performed, and a master shaft is separated from the resin molded product, and a cylindrical electroformed shell is formed in the shaft hole. The method includes a step of forming a cast part integrally formed with a bearing part, and a step of mounting the master shaft separated from the resin molded product on the electroformed part of the bearing part and using it for the shaft part .
[0010]
According to this method of manufacturing a pair of shafts and resin bearing parts, injection molding is performed with the electroformed part integrated with the master shaft in the mold, so the electroformed part can be easily inserted with high positioning accuracy. The inner peripheral surface of the electroformed part, which is an electroformed shell from which the master shaft is separated, forms the shaft hole of the bearing part, so that it is possible to obtain a resin bearing part with high roundness and high dimensional accuracy. .
[0011]
(Delete)
[0012]
In the above-described pair of shafts and the resin bearing part and the manufacturing method thereof, the master shaft separated from the resin molded product can be mounted on the electroformed part of the bearing part and used as a shaft part. Since the clearance between the shaft and the shaft hole becomes smaller, it is suitable for a shaft and a bearing portion that require highly precise rotation or sliding or sliding rotation.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a pair of shafts and a resin bearing part according to the present invention and a manufacturing method thereof will be described in detail with reference to the accompanying drawings of FIGS. 1 to 4 showing a preferred embodiment. As shown in FIG. Using the
[0014]
The
[0015]
The material of the
[0016]
The shape of the
[0017]
The masking of the
[0018]
Various types of electroformed metal can be used for the
[0019]
In addition, when the electroforming process is performed on the
[0020]
That is, when the
[0021]
Next, as shown in FIG. 2, the
[0022]
As the resin material, in addition to the liquid crystal polymer (LCP), a crystalline polymer such as polyphenylene sulfide (PPS) resin, polyacetal resin, polyamide resin, or other high-performance resin material that exhibits the same function may be used. It is possible, and an additive which becomes a fiber reinforcing agent or a lubricant may be added as necessary.
[0023]
As a result, a resin molded
[0024]
Therefore, as shown in FIG. 4, it is possible to obtain a
[0025]
Moreover, since the outer peripheral surface is rough and the inner peripheral surface is formed smoothly from the basic properties of electroforming, the
[0026]
(Delete)
[0027]
(Delete)
[0028]
In the case of the pair of shafts and the resin bearing parts and the manufacturing method thereof according to the above embodiment, since the
[0029]
For example, when a conventional bearing part having a shaft hole subjected to electroforming is manufactured by the conventional technique, the shaft hole of a resin-molded portion that has been previously injection molded is subjected to electroforming later. In the present invention, it is extremely difficult to place electrodes in the holes, mask non-electroformed parts, and perform uniform and constant electroforming in the shaft holes. By using the means explained in the above, practical use was made possible.
[Brief description of the drawings]
FIG. 1 is a front view of a master shaft (a) and an electroformed shaft (b) used in a pair of shafts and resin bearing parts to which the present invention is applied and a method for manufacturing the same .
2 is a schematic longitudinal sectional view of an essential part of injection molding performed by inserting the electroformed shaft of FIG. 1;
3 is a longitudinal sectional view of a resin molded product in which an electroformed shaft and a resin molded portion obtained by injection molding in FIG. 2 are integrated. FIG.
4 is a longitudinal sectional view of a separation step in which only a master shaft is separated from the resin molded product of FIG. 3 to obtain a bearing component with an electroformed part.
[Explanation of symbols]
1
3
Claims (2)
Priority Applications (1)
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JP2001242555A JP3820480B2 (en) | 2001-08-09 | 2001-08-09 | A pair of shafts and resin bearing parts and method of manufacturing the same |
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JP2001242555A JP3820480B2 (en) | 2001-08-09 | 2001-08-09 | A pair of shafts and resin bearing parts and method of manufacturing the same |
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JP2005313663A Division JP4390150B2 (en) | 2005-10-28 | 2005-10-28 | Resin bearing parts and manufacturing method thereof |
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JP2003056552A JP2003056552A (en) | 2003-02-26 |
JP3820480B2 true JP3820480B2 (en) | 2006-09-13 |
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