【０００１】
【発明の属する技術分野】
本発明は例えば合成樹脂材料を成形するための成形金型の製造方法及び装置に関する。
【０００２】
【発明が解決しようとする課題】
従来、例えば合成樹脂製の野球ボールなどを成形するための合成樹脂成形金型をアルミニュウム合金で製造する場合、略半円球形の成形面を形成する凸型と凹型を用いて鋳造加工によりアルミダイカスト製の成形金型を形成していたが、野球ボールなどの合成樹脂製品の表面に突起を形成するとき、成形金型に形成する窪みがアンダーカットになり、前記成形金型を凸型から抜出すことができないので、凸型を抜出すことができるように成形金型を鋳造加工によって形成した後、その成形金型を切削加工してアンダーカットの窪みを形成する必要があり、鋳造加工した後の切削加工の簡略化を容易に行い得ず、製造時間の短縮並びに製造コストの低減などを容易に図り得ない等の問題がある。
【０００３】
【課題を解決するための手段】
然るに、本発明は、一対の凹型と凸型を用いて鋳造加工により成形金型を形成する成形金型の製造方法において、前記凸型の外周径を縮少自在とし、凸型の外周径を縮少させた後、成形金型を取出すもので、例えばアンダーカット形状の成形面を有する成形金型であっても、凸型の外周径の縮少によって成形金型と離反させ得、鋳造加工した後の仕上げ加工を簡略化して製造コストの低減などを容易に行い得るものである。
【０００４】
また、略半円球形の成形面を形成する凸型を、前記成形面の略中央に位置させる芯型と、間隔を設けて対向させる一対のＸ方向型と、芯型及びＸ方向型に接合させる一対のＹ方向型とにより構成すると共に、芯型を抜出し、一対のＸ方向型を接近させた後、一対のＹ方向型を接近させ、凸型の外周径を縮少させるもので、例えばアンダーカット形状の成形面を有する成形金型であっても、凸型の外周径の縮少によって成形金型と離反させ得、鋳造加工した後の仕上げ加工を簡略化して製造コストの低減などを容易に行い得るものである。
【０００５】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて詳述する。図１は鋳造方法の説明図であり、図１乃至図９に示す如く、溶解したアルミニュウム合金を流し込む湯口１を有する凹型２と、略半円球形の成形面を形成する凸型３とを備え、アルミダイカスト製の成形金型４を鋳造加工により製作するもので、成形面の略中央に位置させる芯型５と、間隔を設けて対向させる一対のＸ方向型６と、芯型５及びＸ方向型６に接合させる一対のＹ方向型７とにより、前記凸型３を構成すると共に、前記の各型６・７を支えるストリッパプレート８と、該プレート８にボルト形ストッパ９を介して連結させる受板１０と、突上げピン１１及びＸ方向ラックピン１２及びＹ方向ラックピン１３及びサポートピン１４を配設させる上下エジェクタプレート１５・１６と、前記芯型５をボルト１７止め固定させるベースプレート１８とを設ける。
【０００６】
そして、図２及び図８の状態下で、凹型２と凸型３の間に湯口１から溶解した約７００℃のアルミニュウム合金材料を流し込むと共に、冷却通路１９に冷却水を送って約３００℃に冷却させ、鋳造加工する。また、図３の如く、凹凸型２・３間に成形金型４が形成されたとき、凹型２を上方に離反させ、かつ各プレート８・１５・１６を持上げて芯型５を下方に離反させると共に、図４の如く、各プレート１５・１６を持上げることにより、Ｘ方向ラックピン１２のカム２０によって一対のＸ方向型６を互に接近させ、次いでＹ方向ラックピン１３のカム２１によって一対のＹ方向型７を互に接近させ、凸型３の略半円球形の成形面の外周径を縮少させ、成形金型４に形成するアンダーカット形の窪み２２から凸型３を抜出させ、突上げピン１１の二段突出し動作によって成形金型４を凹型３の上方に持上げ、成形金型４を取出す。
【０００７】
従って、前記のアンダーカット形の窪み２２を、鋳造加工後に、成形金型４に切削加工により形成する必要がなく、しかも合成樹脂製品である野球ボールの縫い目模様とマークの境で各型５・６・７を分割して凸型３を形成することにより、各型５・６・７の接合面によって成形金型４に形成される各型５・６・７の境界線の切除などの二次加工（仕上げ）が容易に行える。
【０００８】
上記から明らかなように、一対の凹型２と凸型３を用いて鋳造加工により成形金型４を形成する成形金型の製造方法において、前記凸型３の外周径を縮少自在とし、凸型３の外周径を縮少させた後、成形金型４を取出すもので、例えばアンダーカット形状の成形面を有する成形金型４であっても、凸型３の外周径の縮少によって成形金型４と離反させ、鋳造加工した後の仕上げ加工を簡略化して製造コストの低減などを行う。
【０００９】
また、略半円球形の成形面を形成する凸型３を、前記成形面の略中央に位置させる芯型５と、間隔を設けて対向させる一対のＸ方向型６と、芯型５及びＸ方向型６に接合させる一対のＹ方向型７とにより構成すると共に、芯型５を抜出し、一対のＸ方向型６を接近させた後、一対のＹ方向型７を接近させ、凸型３の外周径を縮少させるもので、例えばアンダーカット形状の成形面を有する成形金型４であっても、凸型３の外周径の縮少によって成形金型４と離反させ、鋳造加工した後の仕上げ加工を簡略化して製造コストの低減などを容易に行う。
【００１０】
さらに、図１０に示す如く、凹型２とストリッパプレート８を引張リング２３によって連結させ、前記プレート８を持上げることにより、上記と同様に、芯金５を離反させ、Ｘ方向型６を互に接近させた後、一対のＹ方向型７を互に接近させ、各型５・６・７から成形金型４を離反させて取出すことも行える。
【００１１】
さらに、図１１に示す如く、ストリッパプレート８をエジェクタプレート１５にエジェクタピン２４を介して連結させ、一対のＸ方向型６を互に接近させるアンギラピン２５と、一対のＹ方向型７を互に接近させるローズコア２６を設けると共に、エアシリンダ２７の先頭ピストン２８の進出によってアンギラピン２５を介して一対のＸ方向型６を持上げ乍ら互に接近させた後、前記エアシリンダ２７の二段ピストン２９の進出によってローズコア２６を介して一対のＹ方向型７を持上げ乍ら互に接近させ、各型５・６・７で形成する凸型３の外周径を縮少させて成形金型４を取出すことも行える。
【００１２】
さらに、図１２に示す如く、大きな弾性変形態を持つチタン焼結合金で凹型３を中空の気球形に形成し、ベースプレート３０に凹型３基部を支持させ、プレスプレート３１を凹型３の中間に当接させ、エジェクタピン３２によってプレスプレート３１を持上げて凹型３を絞り、弾性変形により凹型の外周径を縮少させて成形金型４を取出すことも行える。また、凹型３の内周面に溝３３を形成することにより、凹型３の外周径を縮少させるときの歪を低減させ、凹型３の縮少圧力の低減並びに凹型３の復元性の向上などを図れる。
【００１３】
【発明の効果】
以上実施例から明らかなように本発明は、一対の凹型２と凸型３を用いて鋳造加工により成形金型４を形成する成形金型の製造方法において、前記凸型３の外周径を縮少自在とし、凸型３の外周径を縮少させた後、成形金型４を取出すもので、例えばアンダーカット形状の成形面を有する成形金型４であっても、凸型３の外周径の縮少によって成形金型４と離反させることができ、鋳造加工した後の仕上げ加工を簡略化して製造コストの低減などを容易に行うことができるものである。
【００１４】
また、略半円球形の成形面を形成する凸型３を、前記成形面の略中央に位置させる芯型５と、間隔を設けて対向させる一対のＸ方向型６と、芯型５及びＸ方向型６に接合させる一対のＹ方向型７とにより構成すると共に、芯型５を抜出し、一対のＸ方向型６を接近させた後、一対のＹ方向型７を接近させ、凸型３の外周径を縮少させるもので、例えばアンダーカット形状の成形面を有する成形金型４であっても、凸型３の外周径の縮少によって成形金型４と離反させることができ、鋳造加工した後の仕上げ加工を簡略化して製造コストの低減などを容易に行うことができるものである。
【図面の簡単な説明】
【図１】成形金型の形成説明図。
【図２】同要部説明図。
【図３】同要部説明図。
【図４】同要部説明図。
【図５】凸型の説明図。
【図６】成形金型の説明図。
【図７】同断面説明図。
【図８】成形金型の鋳造説明図。
【図９】同要部説明図。
【図１０】変形例を示す説明図。
【図１１】変形例を示す説明図。
【図１２】変形例を示す説明図。
【符号の説明】
２ 凹型
３ 凸型
４ 成形金型
５ 芯型
６ Ｘ方向型
７ Ｙ方向型[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for manufacturing a molding die for molding, for example, a synthetic resin material.
[0002]
[Problems to be solved by the invention]
Conventionally, for example, when a synthetic resin molding die for molding a synthetic resin baseball ball or the like is made of an aluminum alloy, aluminum die casting is performed by casting using a convex mold and a concave mold that form a substantially semicircular spherical molding surface. When a projection is formed on the surface of a synthetic resin product such as a baseball ball, the depression formed in the molding die is undercut, and the molding die is removed from the convex mold. Since it is not possible to take out, it is necessary to form a molding die by casting so that the convex mold can be extracted, and then it is necessary to cut the molding die to form an undercut depression, There is a problem that it is not easy to simplify the subsequent cutting work, and it is not easy to shorten the manufacturing time and the manufacturing cost.
[0003]
[Means for Solving the Problems]
Therefore, the present invention provides a method for manufacturing a molding die, in which a molding die is formed by casting using a pair of a concave mold and a convex mold, wherein the outer diameter of the convex mold can be reduced and the outer diameter of the convex mold can be reduced. After the reduction, the molding die is taken out. For example, even if the molding die has an undercut-shaped molding surface, it can be separated from the molding die by reducing the outer diameter of the convex mold, and the casting It is possible to simplify the finishing work after the above and to easily reduce the manufacturing cost.
[0004]
Also, a convex mold forming a substantially semi-spherical molding surface is joined to a core mold located substantially at the center of the molding surface, a pair of X-direction molds opposed to each other with an interval, and a core mold and an X-direction mold. With a pair of Y-direction molds, the core mold is extracted, and after a pair of X-direction molds are made to approach each other, a pair of Y-direction molds are made closer to each other to reduce the outer diameter of the convex mold. Even with a molding die having an undercut shape molding surface, it can be separated from the molding die by reducing the outer diameter of the convex mold, simplifying the finishing work after casting and reducing the manufacturing cost etc. It can be done easily.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view of a casting method. As shown in FIGS. 1 to 9, the casting mold includes a concave mold 2 having a gate 1 into which a molten aluminum alloy is poured, and a convex mold 3 forming a substantially semi-spherical molding surface. And a die 4 made of aluminum die-casting, which is manufactured by casting, a core die 5 located substantially at the center of the molding surface, a pair of X-direction dies 6 opposed to each other at intervals, and core dies 5 and X The convex mold 3 is constituted by a pair of Y-direction molds 7 joined to the direction mold 6, and a stripper plate 8 for supporting the molds 6 and 7 is connected to the plate 8 via a bolt-type stopper 9. Receiving plate 10, upper and lower ejector plates 15 and 16 on which push-up pins 11, X-direction rack pins 12, Y-direction rack pins 13, and support pins 14 are arranged, and a base for fixing the core mold 5 with bolts 17. Providing a rate 18.
[0006]
Then, under the condition of FIGS. 2 and 8, an aluminum alloy material of about 700 ° C. dissolved from the gate 1 is poured between the concave mold 2 and the convex mold 3, and cooling water is sent to the cooling passage 19 to about 300 ° C. Allow to cool and cast. Also, as shown in FIG. 3, when the molding die 4 is formed between the concave and convex dies 2, 3, the concave dies 2 are separated upward, and the plates 8, 15, 16 are lifted to separate the core die 5 downward. At the same time, as shown in FIG. 4, the plates 15 and 16 are lifted to bring the pair of X-direction dies 6 closer to each other by the cam 20 of the X-direction rack pin 12 and then to the pair of cams 21 of the Y-direction rack pin 13. The Y-direction molds 7 are moved closer to each other, the outer diameter of the substantially semi-spherical molding surface of the convex mold 3 is reduced, and the convex mold 3 is extracted from the undercut-shaped recess 22 formed in the molding die 4. Then, the molding die 4 is lifted above the concave mold 3 by the two-step projecting operation of the push-up pin 11 and the molding die 4 is taken out.
[0007]
Therefore, it is not necessary to form the undercut-shaped recess 22 by cutting in the molding die 4 after casting, and at the boundary between the seam pattern and the mark of the baseball, which is a synthetic resin product, each mold 5. By dividing the protrusions 6 and 7 to form the convex molds 3, the boundary surfaces of the molds 5, 6 and 7 formed on the molding die 4 by the joining surfaces of the molds 5, 6 and 7 can be removed. The next processing (finishing) can be performed easily.
[0008]
As is clear from the above, in the method of manufacturing a molding die in which the molding die 4 is formed by casting using a pair of the concave mold 2 and the convex mold 3, the outer diameter of the convex mold 3 is reduced, and After the outer diameter of the mold 3 is reduced, the molding die 4 is taken out. For example, even if the molding die 4 has an undercut-shaped molding surface, the molding is performed by reducing the outer diameter of the convex mold 3. It is separated from the mold 4 to simplify the finishing after casting, thereby reducing the manufacturing cost.
[0009]
Also, a core mold 5 that forms a substantially semi-spherical molding surface at substantially the center of the molding surface, a pair of X-direction dies 6 that face each other with an interval, and a core mold 5 and X It is composed of a pair of Y-direction dies 7 joined to the direction die 6, the core die 5 is pulled out, and the pair of X-direction dies 6 are made to approach each other. The outer diameter is reduced. For example, even if the molding die 4 has an undercut-shaped molding surface, the molding die 4 is separated from the molding die 4 by the reduction of the outer diameter of the convex die 3 and cast. The finishing process is simplified, and the production cost is easily reduced.
[0010]
Further, as shown in FIG. 10, the concave mold 2 and the stripper plate 8 are connected by a tension ring 23, and the plate 8 is lifted, thereby separating the cored bar 5 in the same manner as described above and bringing the X-direction molds 6 together. After the approach, the pair of Y-direction dies 7 can be made to approach each other, and the molding dies 4 can be separated from each of the dies 5, 6, 7 and taken out.
[0011]
Further, as shown in FIG. 11, the stripper plate 8 is connected to the ejector plate 15 via the ejector pin 24, and the pair of X-direction dies 6 approach each other, and the pair of Y-direction dies 7 approach each other. And a pair of X-direction dies 6 are lifted up through the anguilla pin 25 by the advancement of the leading piston 28 of the air cylinder 27, and then the two-stage piston 29 of the air cylinder 27 is advanced. By lifting the pair of Y-direction dies 7 through the rose core 26 and bringing them closer together, the outer diameter of the convex die 3 formed by each of the dies 5, 6, 7 can be reduced to take out the molding die 4. I can do it.
[0012]
Further, as shown in FIG. 12, the concave mold 3 is formed into a hollow balloon shape using a titanium sintered alloy having a large elastic deformation, the base of the concave mold 3 is supported on the base plate 30, and the press plate 31 is placed in the middle of the concave mold 3. Then, the press plate 31 is lifted by the ejector pins 32 to squeeze the concave mold 3, and the outer diameter of the concave mold is reduced by elastic deformation to take out the molding die 4. Further, by forming the groove 33 on the inner peripheral surface of the concave mold 3, the distortion when the outer diameter of the concave mold 3 is reduced is reduced, the pressure for reducing the concave mold 3 is reduced, and the resilience of the concave mold 3 is improved. Can be achieved.
[0013]
【The invention's effect】
As is apparent from the above embodiments, the present invention relates to a method of manufacturing a molding die in which a molding die 4 is formed by casting using a pair of a concave mold 2 and a convex mold 3, and the outer diameter of the convex mold 3 is reduced. The molding die 4 is taken out after the outer diameter of the convex mold 3 is reduced, and the outer diameter of the convex mold 3 may be reduced even if the molding die 4 has an undercut-shaped molding surface. Can be separated from the molding die 4 and the finishing after casting can be simplified, and the production cost can be easily reduced.
[0014]
Also, a core mold 5 that forms a substantially semi-spherical molding surface at substantially the center of the molding surface, a pair of X-direction dies 6 that face each other with an interval, and a core mold 5 and X It comprises a pair of Y-direction molds 7 joined to the direction mold 6, and also extracts the core mold 5, makes the pair of X-direction molds 6 approach each other, and then makes the pair of Y-direction molds 7 approach each other to form the convex mold 3. The outer diameter is reduced. For example, even if the molding die 4 has a molding surface of an undercut shape, the molding die 4 can be separated from the molding die 4 by reducing the outer diameter of the convex die 3, and the casting process is performed. It is possible to simplify the finishing work after the above and to easily reduce the manufacturing cost.
[Brief description of the drawings]
FIG. 1 is an explanatory view of forming a molding die.
FIG. 2 is an explanatory diagram of the main part.
FIG. 3 is an explanatory diagram of the main part.
FIG. 4 is an explanatory view of the main part.
FIG. 5 is an explanatory view of a convex shape.
FIG. 6 is an explanatory view of a molding die.
FIG. 7 is an explanatory sectional view of the same.
FIG. 8 is an explanatory view of casting of a molding die.
FIG. 9 is an explanatory view of the main part.
FIG. 10 is an explanatory view showing a modification.
FIG. 11 is an explanatory view showing a modification.
FIG. 12 is an explanatory diagram showing a modification.
[Explanation of symbols]
2 concave mold 3 convex mold 4 molding mold 5 core mold 6 X-direction mold 7 Y-direction mold
