JP2007130822A - Mold - Google Patents

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JP2007130822A
JP2007130822A JP2005324294A JP2005324294A JP2007130822A JP 2007130822 A JP2007130822 A JP 2007130822A JP 2005324294 A JP2005324294 A JP 2005324294A JP 2005324294 A JP2005324294 A JP 2005324294A JP 2007130822 A JP2007130822 A JP 2007130822A
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mold
spherical
body member
main body
nesting
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Noriko Sakaeba
範子 榮羽
Seiichi Watanabe
清一 渡辺
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Fujifilm Corp
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Fujifilm Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold which can secure the supporting rigidity of a nesting member and a cavity insert by spherical bodies and mold durability. <P>SOLUTION: The mold 1 has the nesting 110 having a cavity surface Ca in the shape of a part of a molding and the body member 120 supporting the cavity insert 110 movably from the outside through a plurality of the spherical bodies 131. The spherical bodies 131, the nesting 110, and the body member 120 are formed, so that the value of pressurization generated by making the diameters of the spherical bodies 131 larger than the clearance between the nesting 110 and the body member 120 is 4 μm or below per spherical body, and the product of the pressurization and the total number of the spherical bodies is at least 30 μm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、キャビティ面を有する入れ子が、複数の球状体を介して本体部材で支持されることによって、本体部材に対して移動自在となる成形用金型に関する。   The present invention relates to a molding die that is movable with respect to a main body member when a nest having a cavity surface is supported by the main body member via a plurality of spherical bodies.

一般に、プラスチック光学レンズ（以下、単に「光学レンズ」ともいう。）用の成形用金型として、固定側金型のキャビティ面（成形面）を光学レンズの一方の光学面に対応させた形状とするとともに、この固定側金型に対して離接自在となる移動側金型のキャビティ面を光学レンズの他方の光学面に対応させた形状とするものがある。このような金型としては、従来、その先端にキャビティ面が形成されている入れ子と、筒状の周壁の適所で複数の球状体を回転自在に支持するボールリテーナと、このボールリテーナを介して前記入れ子を外側から移動自在に支持する本体部材と、で構成したものが知られている（特許文献１参照）。そして、このような金型では、入れ子を本体部材に対して移動させて、入れ子のキャビティ面を本体部材から突き出すことで、成形品の取り出しが容易となっている。   In general, as a molding die for a plastic optical lens (hereinafter, also simply referred to as “optical lens”), a shape in which a cavity surface (molding surface) of a fixed-side mold corresponds to one optical surface of the optical lens, In addition, there is a type in which the cavity surface of the movable mold that can be separated from and attached to the fixed mold is made to correspond to the other optical surface of the optical lens. As such a mold, conventionally, a nest having a cavity surface formed at the tip thereof, a ball retainer that rotatably supports a plurality of spherical bodies at appropriate positions on a cylindrical peripheral wall, and via this ball retainer A main body member that supports the insert from the outside is known (see Patent Document 1). In such a mold, the molded article can be easily taken out by moving the insert relative to the main body member and projecting the cavity surface of the insert from the main body member.

特開２００３−２３１１５９号公報JP 2003-231159 A

ところで、金型内で使用されるベアリング（ボールリテーナと、これに転動する入れ子および本体部材の転動部分）は、（１）使用温度が高い（およそ８０℃〜１５０℃）こと、（２）入れ子および本体部材が樹脂からの圧力による変形し、それが何十万回と繰り返されること、（３）樹脂の流れに起因して偏荷重が何十万回と繰り返されてかかる、など使用環境が特殊である。
上記の理由から、位置精度(剛性含む)、耐久性の問題があり、型のベアリング設計指針が明らかでないという問題があった。 By the way, the bearings used in the mold (the ball retainer, the nest and the rolling part of the main body member that rolls on the ball retainer) are (1) the use temperature is high (approximately 80 ° C. to 150 ° C.), (2 ) Nesting and body member are deformed by pressure from resin and it is repeated hundreds of thousands of times. (3) Uneven load is repeated hundreds of thousands of times due to resin flow. The environment is special.
For the above reasons, there are problems of positional accuracy (including rigidity) and durability, and there is a problem that the bearing design guideline of the mold is not clear.

具体的には、前記した金型においては、入れ子と本体部材との隙間が球状体の径よりも大きい場合には、入れ子が本体部材に対してがたつくといった問題が発生し、また、前記隙間が球状体の径と同程度かそれよりも僅かに小さい場合には、複数の球状体を介して支持される入れ子の支持剛性が弱いため、溶融樹脂の射出圧力により入れ子が傾くといった問題が発生していた。特に、光学レンズや鏡枠などの光学部品を成形する場合には、入れ子が本体部材に対して傾くと、成形品の光軸がずれてしまい、品質に重大な悪影響を及ぼすおそれもあった。さらに、前記隙間が球状体の径よりもかなり小さい場合には、金型（ベアリング）の耐久性が低下するという問題が発生していた。   Specifically, in the above-described mold, when the gap between the nest and the main body member is larger than the diameter of the spherical body, there arises a problem that the nest rattles against the main body member. If the diameter of the sphere is the same as or slightly smaller than the diameter of the sphere, the support rigidity of the nesting supported via a plurality of spheres is weak, so the problem arises that the nesting is tilted by the injection pressure of the molten resin. It was. In particular, when molding an optical component such as an optical lens or a lens frame, if the insert is tilted with respect to the main body member, the optical axis of the molded product is shifted, which may have a serious adverse effect on quality. Further, when the gap is considerably smaller than the diameter of the spherical body, there has been a problem that the durability of the mold (bearing) is lowered.

そこで、本発明では、複数の球状体を介して支持される入れ子の支持剛性を確保できるとともに、耐久性も確保できる成形用金型を提供することを目的とする。   Therefore, an object of the present invention is to provide a molding die that can ensure the supporting rigidity of the nest supported through a plurality of spherical bodies and also ensure the durability.

前記課題を解決する本発明は、成形品の一部の形状を象ったキャビティ面を有する入れ子と、前記入れ子を複数の球状体を介して外側から移動自在に支持する本体部材と、を有する成形用金型であって、前記球状体の径を前記入れ子と前記本体部材の隙間よりも大きくすることによって生じる与圧の値が、球状体１つあたり４μｍ以下であり、かつ、与圧と全球状体数の積が３０μｍ以上となるように、前記球状体、前記入れ子および前記本体部材が形成されていることを特徴とする。   The present invention that solves the above-described problems includes a nest having a cavity surface that represents a shape of a part of a molded product, and a main body member that supports the nest so as to be movable from the outside via a plurality of spherical bodies. In the molding die, the value of the pressure generated by making the diameter of the spherical body larger than the gap between the insert and the main body member is 4 μm or less per spherical body, and The spherical body, the insert and the main body member are formed so that the product of the total number of spherical bodies is 30 μm or more.

ここで、「与圧」とは、球状体と内壁（本体部材）または外壁（入れ子）との間に隙間がなくなるように圧力をかけることをいい、その単位は、圧力の単位（Ｐａ）ではなく、内壁と外壁の隙間と球状体直径との差で「μｍ」となっている。   Here, “pressurization” refers to applying pressure so that there is no gap between the spherical body and the inner wall (main body member) or outer wall (nesting), and the unit is the pressure unit (Pa). The difference between the gap between the inner wall and the outer wall and the spherical body diameter is “μm”.

本発明によれば、与圧と全球状体数の積を３０μｍ以上とすることで、本体部材および球状体による入れ子の支持剛性を確保できるとともに、球状体１つあたり４μｍ以下とすることで、金型（球状体・入れ子・本体部材全て含む）の耐久性を確保できる。なお、前記した与圧と球状体数の値は、発明者の鋭意研究により得られた値である。すなわち、発明者は、耐久性の支配因子は与圧であり、与圧が高すぎると球状体だけでなく入れ子や本体部材が劣化し、金型の寿命が短くなる（耐久性の低下）ことに着目して、射出成形用金型の一般的な寿命である５０万ショットを保たせるためには、与圧は球状体１つあたり４μｍ以下にすることが望ましいことを見いだした。一方で、発明者は、位置精度（剛性）は与圧と球数が支配因子であり、与圧および球数を大きくすることで位置精度は向上することに着目して、位置精度に関する与圧と球数の適性範囲は実験から以下の式を満たせばよいことを見いだした。(与圧は球状体１つあたり)
（与圧[μｍ]）×（全球数）≧３０〔μｍ〕
そして、このように与圧および球状体数を設定することで、入れ子の支持剛性の確保と金型の耐久性の確保といった、従来ではなし得なかった相反する２つの課題の両立が実現されている。 According to the present invention, by setting the product of the pressurization and the total number of spherical bodies to 30 μm or more, it is possible to ensure the supporting rigidity of the nesting by the main body member and the spherical body, and to make it 4 μm or less per spherical body, The durability of the mold (including all spherical bodies, inserts, and main body members) can be secured. In addition, the above-mentioned values of the pressurization and the number of spherical bodies are values obtained by inventor's earnest research. In other words, the inventor found that the controlling factor of durability is the pressurization. If the pressurization is too high, not only the spherical body but also the nesting and main body members are deteriorated, and the life of the mold is shortened (decrease in durability). In order to maintain 500,000 shots, which is a general life of an injection mold, it was found that the pressure is preferably 4 μm or less per spherical body. On the other hand, the inventor paid attention to the fact that the position accuracy (rigidity) is governed by the pressure and the number of balls, and that the position accuracy is improved by increasing the pressure and the number of balls. From the experiment, we found that the appropriate range of the number of balls should satisfy the following formula. (Pressure is per spherical body)
(Pressure [μm]) × (Total number of balls) ≧ 30 [μm]
By setting the pressurization and the number of spherical bodies in this way, it is possible to achieve two conflicting issues that could not be achieved in the past, such as securing the support rigidity of the insert and ensuring the durability of the mold. Yes.

本発明によれば、与圧が球状体１つあたり直径で４mｍ以下であり、かつ、与圧と全球状体数の積が３０μｍ以上となるように、球状体、入れ子および本体部材を形成するので、入れ子の支持剛性を確保できるとともに、金型の耐久性を確保することができる。   According to the present invention, the spherical body, the nest, and the main body member are formed so that the pressure is 4 mm or less per spherical body and the product of the pressure and the total number of spherical bodies is 30 μm or more. Therefore, the support rigidity of the insert can be ensured and the durability of the mold can be ensured.

次に、本発明の実施形態について、適宜図面を参照しながら詳細に説明する。図１は、本実施形態に係る成形用金型を示す全体断面図である。   Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is an overall cross-sectional view showing a molding die according to the present embodiment.

図１に示すように、成形用金型１は、第１の金型１００と第２の金型２００との間にキャビティＣを形成し、当該キャビティＣ内に溶融樹脂を供給することで成形品たる光学レンズを成形するものである。なお、キャビティＣには、溶融樹脂の通り道となるスプールやゲート（図示せず）が連通するようになっている。また、第１の金型１００および第２の金型２００は、それぞれ図示しない射出成形装置の可動側および固定側に取り付けられ、第１の金型１００は第２の金型２００に対して離接自在（軸方向に移動自在）に配置されている。   As shown in FIG. 1, the molding die 1 is formed by forming a cavity C between the first die 100 and the second die 200 and supplying molten resin into the cavity C. The optical lens as a product is molded. The cavity C communicates with a spool or a gate (not shown) that serves as a passage for the molten resin. The first mold 100 and the second mold 200 are respectively attached to the movable side and the fixed side of an injection molding apparatus (not shown), and the first mold 100 is separated from the second mold 200. It is arranged so that it can be freely touched (movable in the axial direction).

第１の金型１００は、光学レンズの一方の光学面形状（成形品の一部）を象ったキャビティ面Ｃａが先端に形成されている入れ子１１０と、この入れ子１１０が嵌め入れられる本体部材１２０と、で主に構成されており、その入れ子１１０と本体部材１２０との間には、ボールリテーナ１３０が設けられている。   The first mold 100 includes a nest 110 having a cavity surface Ca formed at the tip thereof, which is shaped like one optical surface of the optical lens (a part of a molded product), and a body member into which the nest 110 is fitted. 120, and a ball retainer 130 is provided between the insert 110 and the main body member 120.

入れ子１１０は、本体部材１２０とは別部品に構成された金属製の部材であり、略円柱状に形成される入れ子本体１１１と、この入れ子本体１１１の一端側（図１の右側）の中央部から延出する柱状部１１２と、から構成されている。   The nesting 110 is a metal member configured as a separate part from the main body member 120, and the nesting main body 111 formed in a substantially columnar shape, and a central portion on one end side (right side in FIG. 1) of the nesting main body 111. And a columnar portion 112 extending from the column.

入れ子本体１１１は、後記する本体部材１２０の太穴部１２２よりも太径に形成されており、これにより、その一端側の面が本体部材１２０の他端側（図１の左側）の面と当接可能となっている。   The nesting body 111 is formed to have a larger diameter than the thick hole portion 122 of the body member 120 to be described later, so that the surface on one end side thereof is the surface on the other end side (left side in FIG. 1) of the body member 120. Contact is possible.

柱状部１１２は、本体部材１２０と嵌合する部分であり、本実施形態においては、一端側にキャビティ面Ｃａを備える円柱形状の細径部１１４と、この細径部１１４の他端側に連続して細径部１１４よりも太径に形成された円柱形状の太径部１１５と、から構成されている。   The columnar portion 112 is a portion that fits with the main body member 120. In the present embodiment, the columnar portion 112 is continuous with the cylindrical small diameter portion 114 having the cavity surface Ca on one end side and the other end side of the small diameter portion 114. And a cylindrical-shaped large-diameter portion 115 formed with a larger diameter than the small-diameter portion 114.

本体部材１２０は、入れ子１１０を外側から保持するための金属製の部材であり、その中心に中空部を備える円筒形状を呈している。本体部材１２０の中空部は、入れ子１１０の細径部１１４が嵌め込まれる細穴部１２１と、入れ子１１０の太径部１１５と遊嵌する太穴部１２２と、で構成されている。また、本体部材１２０の一端側には、円錐台形状を呈する凸型テーパ部１２３が設けられており、第２の金型２００に対して心合わせができるようになっている。   The main body member 120 is a metal member for holding the insert 110 from the outside, and has a cylindrical shape including a hollow portion at the center thereof. The hollow part of the main body member 120 includes a narrow hole part 121 into which the small diameter part 114 of the nest 110 is fitted, and a thick hole part 122 into which the large diameter part 115 of the nest 110 is loosely fitted. Further, a convex taper portion 123 having a truncated cone shape is provided on one end side of the main body member 120 so that the second member 200 can be centered.

細穴部１２１は、入れ子１１０の細径部１１４に対して略同程度か若干大きく形成されている。具体的には、細穴部１２１は、細径部１１４に対して直径１０〜３０μｍ程度（半径５〜１５μｍ程度）大きく形成するのが好ましく、直径１０〜２０μｍ程度（半径５〜１０μｍ程度）大きく形成するのがさらに好ましい。また、細穴部１２１の一端側は本体部材１２０の一端側に開口しており、当該細穴部１２１に入れ子１１０の細径部１１４を嵌め入れると、細径部１１４の一端側に形成されたキャビティ面Ｃａが、本体部材１２０の一端面に露出するようになっている。なお、成形品をキャビティ面Ｃａから突き出すため、図示のように、太径部１１５の一端側の面と、太穴部１２２の底面との間と、入れ子本体１１１の一端側の面と本体部材１２０の他端側の面との間に、所定の隙間Ｓが生じるように、入れ子１１０および本体部材１２０が配置されている。これにより、第１の金型１００が第２の金型から離れた後、イジェクタープレート（図示せず）により入れ子１１０を押すことで、キャビティ面Ｃａが突き出し、成形品を押し出すようになっている。   The narrow hole 121 is formed to be approximately the same as or slightly larger than the narrow diameter portion 114 of the insert 110. Specifically, the narrow hole portion 121 is preferably formed larger than the small diameter portion 114 by a diameter of about 10 to 30 μm (radius of about 5 to 15 μm), and a diameter of about 10 to 20 μm (radius of about 5 to 10 μm) is larger. More preferably, it is formed. Further, one end side of the narrow hole portion 121 is open to one end side of the main body member 120, and when the small diameter portion 114 of the nest 110 is fitted into the narrow hole portion 121, it is formed on one end side of the small diameter portion 114. The cavity surface Ca is exposed to one end surface of the main body member 120. In addition, in order to protrude the molded product from the cavity surface Ca, as shown in the drawing, between the surface on one end side of the large diameter portion 115 and the bottom surface of the thick hole portion 122, the surface on one end side of the nested body 111, and the body member The insert 110 and the main body member 120 are arranged so that a predetermined gap S is formed between the other end surface of 120. Thereby, after the 1st metal mold | die 100 leaves | separates from a 2nd metal mold | die, the cavity surface Ca protrudes and pushes out a molded article by pushing the nest | insert 110 with an ejector plate (not shown). .

太穴部１２２は、その他端側が本体部材１２０の他端側の端面に開口しており、これにより、入れ子１１０の柱状部１１２が挿入可能になっている。また、太穴部１２２の一端側は、細穴部１２１の他端側と連通している。そして、太穴部１２２と、この太穴部１２２に遊嵌される入れ子１１０の太径部１１５との間には、ボールリテーナ１３０の球状体１３１の直径よりも若干小さい所定の隙間Ｓ２が形成されている。なお、この隙間Ｓ２に関しては、後で詳述することとする。   The other end side of the thick hole portion 122 opens to the end surface on the other end side of the main body member 120, and thus the columnar portion 112 of the insert 110 can be inserted. One end side of the thick hole portion 122 communicates with the other end side of the narrow hole portion 121. A predetermined gap S2 slightly smaller than the diameter of the spherical body 131 of the ball retainer 130 is formed between the thick hole portion 122 and the large diameter portion 115 of the insert 110 that is loosely fitted in the thick hole portion 122. Has been. The gap S2 will be described in detail later.

ボールリテーナ１３０は、本体部材１２０と入れ子１１０との間に介在して入れ子１１０を支持するとともに調心するための部品であり、複数の球状体１３１と、これらの球状体１３１を回転自在に支持する円筒状の支持体１３２とを備えて構成されている。   The ball retainer 130 is a part that is interposed between the main body member 120 and the insert 110 to support and align the insert 110, and supports a plurality of spherical bodies 131 and these spherical bodies 131 to be rotatable. And a cylindrical support 132.

球状体１３１は、前記した入れ子１１０や本体部材１２０の材質よりも硬い材質、例えばベアリング鋼（硬度：ＨＲＣ５８）やステンレス鋼（ＳＵＳ４４０、硬度：ＨＲＣ５６）などで形成されている。また、各球状体１３１は、それぞれ直径公差が１μｍ以下という、非常に高い精度で均一な大きさで形成されており、前記した隙間Ｓ２よりも若干大きな直径に形成されている。具体的には、球状体数が６０個の場合、球状体１つあたりの与圧は０．５〜４μｍとするのが好ましい。同様に、球状体数が３０個の場合は、与圧は１〜４μｍ、１００個の場合は、与圧は０．３〜４μｍとするのが好ましい。このようにすれば、入れ子１１０、本体部材１２０または球状体１３１に加わる与圧（プリロード）の値が、球状体１つあたり４μｍ以下であり、かつ、与圧と全球状体数の積が３０μｍ以上となるため、入れ子１１０が強固に支持されることとなるとともに、金型の耐久性を確保出来る。なお、前記したプリロードの値（範囲）は、発明者の鋭意研究により得られた値であり、このような値とすることで、前記した入れ子の支持剛性の確保と、金型の耐久性の確保といった相反する２つの課題の両立が実現されることが実験やシミュレーション等により確認されている。   The spherical body 131 is formed of a material harder than the material of the insert 110 or the main body member 120, such as bearing steel (hardness: HRC58) or stainless steel (SUS440, hardness: HRC56). Each spherical body 131 is formed in a uniform size with a very high accuracy of a diameter tolerance of 1 μm or less, and has a diameter slightly larger than the gap S2. Specifically, when the number of spherical bodies is 60, the pressurization pressure per spherical body is preferably 0.5 to 4 μm. Similarly, when the number of spherical bodies is 30, the pressure is preferably 1-4 μm, and when it is 100, the pressure is preferably 0.3-4 μm. In this way, the value of the preload applied to the insert 110, the main body member 120 or the spherical body 131 is 4 μm or less per spherical body, and the product of the pressurized pressure and the total number of spherical bodies is 30 μm. Therefore, the insert 110 is firmly supported and the durability of the mold can be ensured. The value (range) of the preload described above is a value obtained by earnest research by the inventors. By setting such a value, it is possible to ensure the support rigidity of the nesting and the durability of the mold. It has been confirmed by experiments and simulations that both conflicting issues such as securing can be realized.

ここで、前記した〔金型の耐久性〕と〔与圧〕との関係や、〔入れ子の支持剛性〕と〔与圧と全球状体数との積〕との関係は、図２に示すグラフのようになっている。すなわち、金型の耐久性は、図２（ａ）に示すように、所定の小さな与圧のところでピークとなり、その後、与圧が大きくなるにつれて、徐々に小さくなるようになっている。そのため、十分な耐久性を確保するためには、与圧を４μｍ以下に設定すればよいことが分かる。一方、剛性は、図２（ｂ）に示すように、与圧と全球状体数との積が大きくなるにつれて、略比例的に大きくなるようになっている。そのため、十分な剛性を確保するためには、与圧と全球状体数との積が３０μｍ以上となるように設定すればよいことが分かる。   Here, the relationship between the above [durability of the mold] and [pressing pressure] and the relationship between [the support rigidity of the nesting] and [the product of the pressing force and the total number of spherical bodies] are shown in FIG. It looks like a graph. That is, as shown in FIG. 2A, the durability of the mold peaks at a predetermined small pressurization, and then gradually decreases as the pressurization increases. Therefore, it can be seen that the pressurization should be set to 4 μm or less in order to ensure sufficient durability. On the other hand, as shown in FIG. 2B, the rigidity increases substantially proportionally as the product of the pressurization and the total number of spherical bodies increases. Therefore, it can be seen that in order to ensure sufficient rigidity, the product of the pressurization and the total number of spherical bodies may be set to be 30 μm or more.

支持体１３２は、球状体１３１を回転自在に支持するための支持孔を複数有しており、これらの支持孔によって支持された各球状体１３１が、支持体１３２の外周面および内周面から突出して、入れ子１１０と本体部材１２０に転動することによって入れ子１１０が本体部材１２０に対して移動自在となっている。   The support body 132 has a plurality of support holes for rotatably supporting the spherical body 131, and each spherical body 131 supported by these support holes extends from the outer peripheral surface and the inner peripheral surface of the support body 132. By projecting and rolling to the nest 110 and the main body member 120, the nest 110 is movable with respect to the main body member 120.

第２の金型２００は、本体部材２２０の他端側（図１の左側）の端面に、第１の金型１００の本体部材１２０の凸型テーパ部１２３と嵌合する凹型テーパ部２２３が形成される点と、突き出し機構が不要なために、第１の金型１００のような隙間Ｓ１がなく密着する点で第１の金型１００とは異なるが、その他の構造は第１の金型１００と同様の構造となっている。なお、第２の金型２００における第１の金型１００と同様の構成要素には、同一符号を付し、その説明は省略することとする。   In the second mold 200, a concave taper portion 223 that fits with the convex taper portion 123 of the main body member 120 of the first mold 100 is formed on the other end side (left side in FIG. 1) of the main body member 220. Since it is formed and does not require a protruding mechanism, the first mold 100 is different from the first mold 100 in that it does not have a gap S1 as in the first mold 100, but the first mold 100 has the other structure. The structure is the same as that of the mold 100. In addition, the same code | symbol is attached | subjected to the component similar to the 1st metal mold | die 100 in the 2nd metal mold | die 200, and the description is abbreviate | omitted.

以上によれば、本実施形態において、次のような効果を得ることができる。
与圧の値が球状体１つあたり４μｍ以下であり、かつ、与圧と全球状体数の積が３０μｍ以上となるように、球状体１３１、入れ子１１０および本体部材１２０を形成するので、入れ子１１０の支持剛性を確保できるとともに、金型の耐久性を確保することができる。 According to the above, the following effects can be obtained in the present embodiment.
Since the spherical body 131, the nest 110, and the main body member 120 are formed so that the value of the pressurization is 4 μm or less per spherical body and the product of the pressurization and the total number of spherical bodies is 30 μm or more. The support rigidity of 110 can be secured, and the durability of the mold can be secured.

以上、本発明は、前記実施形態に限定されることなく、様々な形態で実施される。
前記実施形態では、球状体１３１と支持体１３２で構成されるボールリテーナ１３０を入れ子１１０と本体部材１２０との間に設ける構造に本発明を適用したが、本発明はこれに限定されず、例えば入れ子１１０と本体部材１２０との間に球状体のみを設ける構造に本発明を適用してもよい。
前記実施形態では、光学レンズを製造するための金型に本発明を適用したが、本発明はこれに限定されず、例えば光学レンズを支持する鏡枠等、高い同心度が必要な高精度部品を製造するための金型に本発明を適用してもよい。
前記実施形態では、入れ子１１０の軸方向（移動方向）において並ぶ球状体１３１の数を４つとしたが、本発明はこれに限定されず、その数は２つ以上であればいくつであってもよい。 As mentioned above, this invention is implemented in various forms, without being limited to the said embodiment.
In the above embodiment, the present invention is applied to a structure in which the ball retainer 130 constituted by the spherical body 131 and the support body 132 is provided between the insert 110 and the main body member 120. However, the present invention is not limited to this, for example, You may apply this invention to the structure which provides only a spherical body between the nest | insert 110 and the main-body member 120. FIG.
In the above embodiment, the present invention is applied to a mold for manufacturing an optical lens. However, the present invention is not limited to this, and a high-precision component that requires high concentricity, such as a lens frame that supports the optical lens. You may apply this invention to the metal mold | die for manufacturing.
In the above embodiment, the number of the spherical bodies 131 arranged in the axial direction (movement direction) of the nest 110 is four. However, the present invention is not limited to this. Good.

前記実施形態では、各球状体１３１を略同じ大きさで形成したが、本発明はこれに限定されるものではない。例えば、前記実施形態のような入れ子１１０の移動方向において球状体１３１が３つ以上並ぶように配設されている場合においては、入れ子１１０の移動方向に並ぶ複数（４つ）の球状体１３１のうち、入れ子１１０の移動方向（突出方向または復帰方向）における先頭と後尾に位置するものよりも、その内側に位置するものの径が小さく形成されていてもよい。なお、先頭と後尾（両端）の間の球状体直径は両端の球状体直径の０．１〜０．２％小さいことが望ましい。具体的には、入れ子１１０の移動方向における先頭と後尾（ボールリテーナ１３０の両端側）に位置する球状体１３１の直径が１０００μｍの時、その間の球状体１３１の直径は９９８μｍ〜９９９μｍとするのが望ましい。これによれば、先頭と後尾の大きな球状体１３１によって、入れ子１１０の支持剛性が確保され、それ以外の小さな球状体１３１によって、金型の耐久性が確保される。なお、この場合は、先頭および後尾の球状体１３１付近のプリロードの値と、これ以外の球状体１３１付近のプリロードの値が異なることとなるが、これらのプリロードの値がそれぞれ前記したプリロードの値の範囲内（球状体１つあたり４μｍ以下であり、かつ、与圧と全球状体数の積が３０μｍ以上）に収まっていればよい。   In the above embodiment, the spherical bodies 131 are formed with substantially the same size, but the present invention is not limited to this. For example, in the case where three or more spherical bodies 131 are arranged in the moving direction of the nest 110 as in the above-described embodiment, a plurality of (four) spherical bodies 131 arranged in the moving direction of the nest 110 are arranged. Of these, the diameter of the inner part may be smaller than that of the inner part of the nest 110 in the moving direction (protruding direction or return direction). In addition, it is desirable that the spherical body diameter between the head and the tail (both ends) is 0.1 to 0.2% smaller than the spherical body diameter at both ends. Specifically, when the diameter of the spherical body 131 located at the head and tail (both ends of the ball retainer 130) in the moving direction of the nest 110 is 1000 μm, the diameter of the spherical body 131 between them is 998 μm to 999 μm. desirable. According to this, the support rigidity of the insert 110 is ensured by the large spherical body 131 at the head and the tail, and the durability of the mold is ensured by the other small spherical body 131. In this case, the preload values in the vicinity of the leading and trailing spheres 131 and the preload values in the vicinity of the other spheres 131 are different, but these preload values are the preload values described above. (4 μm or less per spherical body, and the product of the pressure and the total number of spherical bodies is 30 μm or more).

前記実施形態では、第１の金型１００を可動側に、第２の金型２００を固定側に取り付けているが、それには限定されず、突き出し機構を持った第１の金型１００を固定側に取り付けても良い。
前記実施形態では、第１の金型１００、第２の金型２００の両方に球状体１３１を用いているが、片側だけでもよい。 In the embodiment, the first mold 100 is attached to the movable side, and the second mold 200 is attached to the fixed side. However, the present invention is not limited to this, and the first mold 100 having a protruding mechanism is fixed. It may be attached to the side.
In the embodiment, the spherical body 131 is used for both the first mold 100 and the second mold 200, but only one side may be used.

前記実施形態では、第１の金型１００が凸型テーパ１２３部、第２の金型が凹型テーパ部２２３となっているが、逆でもよい。
前記実施形態では、球状体１３１を、ベアリング鋼、ステンレス鋼としたがが、それに限らず、工具鋼やセラミック製のボールなど一般に市販されているベアリングボールであれば限定しない。 In the above-described embodiment, the first mold 100 is the convex taper 123 portion, and the second mold is the concave taper portion 223, but the reverse is also possible.
In the above embodiment, the spherical body 131 is made of bearing steel or stainless steel. However, the spherical body 131 is not limited thereto, and is not limited as long as it is a commercially available bearing ball such as tool steel and ceramic balls.

前記実施形態では、金型を金属製としたが、アルミ、銅、真鍮、各種鋼材など一般に金型として使用される材料であれば限定しない。なお、それら材料製の部材に、種種のコーティング（高精度加工用のメッキや酸化防止層など）がされたものを金型として使用してもよい。   In the said embodiment, although the metal mold | die was metal, if it is a material generally used as a metal mold | die, such as aluminum, copper, brass, various steel materials, it will not limit. In addition, you may use the thing by which various coatings (plating for high precision processing, an antioxidant layer, etc.) were carried out to the members made from those materials as a metal mold | die.

本実施形態に係る成形用金型を示す全体断面図である。It is a whole sectional view showing the metal mold for molding concerning this embodiment. 金型の耐久性と与圧との関係を示すグラフ（ａ）と、入れ子の支持剛性と、与圧と全球状体数との積との関係を示すグラフ（ｂ）である。It is the graph (a) which shows the relationship between durability of a metal mold | die, and pressurization, and the graph (b) which shows the relationship between the support rigidity of a nest | insert, and the product of pressurization and the total number of spherical bodies.

符号の説明Explanation of symbols

１ 成形用金型
１００ 第１の金型
１１０ 入れ子
１１１ 入れ子本体
１１２ 柱状部
１１４ 細径部
１１５ 太径部
１２０ 本体部材
１２１ 細穴部
１２２ 太穴部
１３０ ボールリテーナ
１３１ 球状体
１３２ 支持体
２００ 第２の金型
２２０ 本体部材
Ｃａ キャビティ面
Ｓ２ 隙間 DESCRIPTION OF SYMBOLS 1 Molding die 100 1st metal mold | die 110 Nesting 111 Nesting main body 112 Columnar part 114 Thin diameter part 115 Large diameter part 120 Body member 121 Narrow hole part 122 Thick hole part 130 Ball retainer 131 Spherical body 132 Support body 200 2nd Mold 220 body member Ca cavity surface S2 gap

Claims (1)

成形品の一部の形状を象ったキャビティ面を有する入れ子と、
前記入れ子を複数の球状体を介して外側から移動自在に支持する本体部材と、を有する成形用金型であって、
前記球状体の径を前記入れ子と前記本体部材の隙間よりも大きくすることによって生じる与圧の値が、球状体１つにつき４μｍ以下であり、かつ、前記与圧と全球状体数の積が３０μｍ以上となるように、前記球状体、前記入れ子および前記本体部材が形成されていることを特徴とする成形用金型。 A nesting having a cavity surface that represents the shape of a part of the molded product;
A body member that supports the nesting from outside through a plurality of spherical bodies, and a molding die,
The value of the pressurization generated by making the diameter of the spherical body larger than the gap between the insert and the main body member is 4 μm or less per spherical body, and the product of the pressurization and the total number of spherical bodies is The molding die, wherein the spherical body, the insert and the main body member are formed so as to be 30 μm or more.
JP2005324294A 2005-11-09 2005-11-09 Mold Pending JP2007130822A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011189564A (en) * 2010-03-12 2011-09-29 Fujifilm Corp Mold and molding method

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JPH05272534A (en) * 1992-03-24 1993-10-19 Aiseru Kk Direct acting bearing device
JPH08118432A (en) * 1994-10-25 1996-05-14 Sony Corp Injection mold and assembling method thereof
JP2001353727A (en) * 2000-06-15 2001-12-25 Futaba Corp Positioning pin and bush of mold, and positioning apparatus of mold
JP2003175532A (en) * 2002-12-18 2003-06-24 Toshin Seiko:Kk Mold for injection molding plastic optical lens and method for manufacturing plastic optical lens
JP2003231159A (en) * 2002-12-18 2003-08-19 Toshin Seiko:Kk Injection molding die for plastic optical lens and method for manufacturing plastic optical lens
JP2004183765A (en) * 2002-12-03 2004-07-02 Nsk Ltd Rolling bearing for belt-type continuously variable transmission

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JPS50112643A (en) * 1974-02-18 1975-09-04
JPH0560501A (en) * 1991-08-29 1993-03-09 Mitsutoyo Corp Bearing and manufacture thereof
JPH05272534A (en) * 1992-03-24 1993-10-19 Aiseru Kk Direct acting bearing device
JPH08118432A (en) * 1994-10-25 1996-05-14 Sony Corp Injection mold and assembling method thereof
JP2001353727A (en) * 2000-06-15 2001-12-25 Futaba Corp Positioning pin and bush of mold, and positioning apparatus of mold
JP2004183765A (en) * 2002-12-03 2004-07-02 Nsk Ltd Rolling bearing for belt-type continuously variable transmission
JP2003175532A (en) * 2002-12-18 2003-06-24 Toshin Seiko:Kk Mold for injection molding plastic optical lens and method for manufacturing plastic optical lens
JP2003231159A (en) * 2002-12-18 2003-08-19 Toshin Seiko:Kk Injection molding die for plastic optical lens and method for manufacturing plastic optical lens

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Publication number Priority date Publication date Assignee Title
JP2011189564A (en) * 2010-03-12 2011-09-29 Fujifilm Corp Mold and molding method

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