JP4307687B2

JP4307687B2 - Casting method and casting mold

Info

Publication number: JP4307687B2
Application number: JP2000160120A
Authority: JP
Inventors: 光明上野; 仁谷川; 荘太鳥居
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2000-05-30
Filing date: 2000-05-30
Publication date: 2009-08-05
Anticipated expiration: 2020-05-30
Also published as: JP2001340955A

Description

【０００１】
【発明の属する技術分野】
本発明は鋳造方法及び鋳造用金型の改良に関する。
【０００２】
【従来の技術】
鋳造方法及び鋳造用金型として、例えば特開平１１−１９７６１号公報「ダイカスト用金型」が知られている。
上記技術は、同公報の図４によれば、ダイカスト用の金型６（符号は公報の符号を流用した）は、固定型７と可動型９とでキャビティ８を形成し、このキャビティ８内に固定型７から鋳物１の鋳込み孔４（中空部）を形成する固定中子１０を突出させ、可動型９から鋳造１の鋳抜き孔４に発生するばり３２を削除するためのばり取りピン２３を突出させ、このばり取りピン２３を皿ばね３１で付勢するものである。
【０００３】
【発明が解決しようとする課題】
しかし、上記金型６では、図５に示される通り、ばり取りピン２３が鋳物１の途中で止まるため、取ったバリが鋳物１の途中に引っ掛かる心配がある。すなわち、バリが残った場合には長いピンなどでバリの除去作業が必要になる。
また、固定中子１０の先端とばり取りピン２３の先端とにズレが生じた場合にはうまくばり取りができないということもある。
【０００４】
そこで、本発明の目的は、鋳造品の中空部に発生するばりを確実に取り、このばりを鋳造品の中空部の外に排出することのできる鋳造方法及び鋳造用金型を提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成するために請求項１の鋳造方法は、固定側金型と可動側金型とでキャビティを形成し、このキャビティ内に固定側金型から鋳造品の中空部を形成する固定側ピンを突出させ、キャビティ内に可動側金型から鋳造品の中空部を形成する可動側ピンを突出させ、これらのピンの先端同士をキャビティ内で合せ、このときに、固定側ピン側又は可動ピン側のどちらか一方に形成された凸部を、可動ピン側又は固定ピン側のどちらか他方に形成された凹部に嵌合させ、キャビティに溶湯を注入し、この溶湯が固化した後に鋳造品を可動型側金型に残しつつ型開きを行ない、次に可動側ピンを更に突出することにより、固定側ピンの先端と可動側ピンの先端との合せ面に発生したバリを取ると共に鋳造品の外に排出するようにしたことを特徴とする。
【０００６】
すなわち、型開き後に可動側ピンを更に突出することにより、固定側ピンの先端と可動側ピンの先端との合せ面に発生するバリを取ると共に鋳造品の外に排出する。
固定側ピンの先端と可動側ピンの先端との合せ面に発生するバリを取ると共に鋳造品の外に排出するようにして、鋳造工程の簡素化及び鋳造品の品質の向上を図る。
また、固定側ピン側又は可動ピン側のどちらか一方に形成された凸部を、可動ピン側又は固定ピン側のどちらか他方に形成された凹部に嵌合させたので、可動側ピンの位置決め精度の向上をすることができる。
【０００７】
請求項２は、固定側金型と可動側金型とでキャビティを形成し、このキャビティ内に固定側金型から鋳造品の中空部を形成する固定側ピンを突出させ、キャビティ内に可動側金型から鋳造品の中空部を形成する可動側ピンを突出させ、これらのピンの先端同士をキャビティ内で合せるようにした鋳造用金型において、この鋳造用金型は、可動側ピンを進退させるピン駆動手段と、固定側ピンを弾性的に支える弾発手段とを備え、
固定側ピン又は可動側ピンのどちらか一方は先端に凸部が形成され、可動側ピン又は固定側ピンのどちらか他方は先端に凸部が嵌合する凹部が形成されたことを特徴とする。
【０００８】
ピン駆動手段を進退させることで、例えば、固定側ピンと可動側ピンとの間に発生するばりを取ると共にこのばりを鋳造品の中空部の外に排出するようにする。
すなわち、ピン駆動手段を進退させることで、例えば、固定側ピンと可動側ピンとの間に発生するばりを取ると共にこのばりを鋳造品の中空部の外に排出するようにして、鋳造工程の簡素化及び鋳造品の品質の向上を図る。
また、固定側ピン又は可動側ピンのどちらか一方は先端に凸部が形成され、可動側ピン又は固定側ピンのどちらか他方は先端に凸部が嵌合する凹部が形成されたので、可動側ピンの位置決め精度の向上をすることができると共に、可動側ピンの倒れ防止及びズレ防止を図ることができる。
【０００９】
【発明の実施の形態】
本発明の実施の形態を添付図に基づいて以下に説明する。なお、図面は符号の向きに見るものとする。
図１は本発明に係る鋳造用金型の断面図であり、成形装置１０に鋳造用金型２０をセットした姿を示す。
鋳造用金型２０は、成形装置１０の固定盤１１に取付ける固定側金型２１と、成形装置２０の可動盤１２に取付ける可動側金型２２とからなる。なお、可動盤１２は、成形装置２０に備えたシリンダ１３で横スライドする部材であり、１４は成形装置１０のベッド、２３は固定側金型２１と可動側金型２２とを合せることで形成するキャビティ、Ｆは固定側金型２１と可動側金型２２との合せ面を示す。
【００１０】
固定側金型２１は、金型本体２５に固定側ピン２６をスライド可能に取付け、この固定側ピン２６を付勢する弾発手段としての複数の皿ばね２７・・・（・・・は複数個を示す。以下同じ）を設け、これらの皿ばね２７・・・の弾発力を維持するこのために冷却路（不図示）を形成したものである。すなわち、固定側ピン２６は可動側金型２２に向けて常時皿ばね２７・・・で付勢したものである。
可動側金型２２は、金型本体３５に可動側ピン３６をスライド可能に取付け、この可動側ピン３６に継手３７を接続し、この継手３７に可動側ピン３６を進退させるピン駆動手段としての駆動シリンダ３８を接続したものである。なお、駆動シリンダ３８は、成形装置１０の可動盤１２に取付けたものであって、駆動シリンダ３８を制御する制御部３９を備える。３８ａは駆動シリンダ３８のロッドを示す。
【００１１】
固定側ピン２６は先端に凸部２６ａを形成し、可動側ピン３６は先端に凹部３６ａを形成したものであって、凸部２６ａに凹部３６ａを嵌合させることで可動側ピン３６の芯出し及び振れ止めをしようとするものである。すなわち、固定側ピン２６の先端に凸部２６ａを形成し、可動側ピン３６の先端に凹部３６ａを形成したので、可動側ピン３６の位置決め精度の向上をすることができると共に、可動側ピン３６の倒れ防止及びズレ防止を図ることができる。
【００１２】
また、鋳造用金型２０は、固定側金型２１と可動側金型２２とでキャビティ２３を形成し、このキャビティ２３内に固定側金型２１から鋳造品の中空部を形成する固定側ピン２６を突出させ、キャビティ２３内に可動側金型２２から鋳造品の中空部を形成する可動側ピン３６を突出させ、これらのピン２６，３６の先端同士をキャビティ２３内で合せるようにした鋳造用金型２０において、この鋳造用金型２０は、可動側ピン３６を進退させる駆動シリンダ３８と、固定側ピン２６を弾性的に支える皿ばね２７・・・とを備えたものであり、駆動シリンダ３８を進退させることで、例えば、固定側ピン２６と可動側ピン３６との間に発生するばりを削除すると共に削除したばりを鋳造品の中空部の外に排出することができる。
この結果、鋳造工程の簡素化及び鋳造品の品質の向上を図ることができる。
【００１３】
以上に述べた鋳造用金型２０の作用を次に説明する。
図２（ａ），（ｂ）は本発明に係る鋳造用金型の動作を示す第１説明図である。
（ａ）において、成形装置１０の固定盤１１（図１参照）に固定側金型２１を取付け、成形装置２０の可動盤１２に可動側金型２２を取付ける。
（ｂ）において、成形装置２０の可動盤１２を矢印▲１▼の如く移動することで、固定側金型２１に可動側金型２２を合せる。
【００１４】
図３（ａ），（ｂ）は本発明に係る鋳造用金型の動作を示す第２説明図である。
（ａ）において、駆動シリンダ３８のロッド３８ａを矢印▲２▼の如く前進させ、可動側ピン３６の先端を固定側ピン２６の先端に当て、可動側ピン３６で固定側ピン２６を所定の距離だけ押す。このとき、固定側ピン２６の凸部に可動側ピン３６の凹部３６ａを嵌合させる。
固定側ピン２６の先端に凸部２６ａを形成し、可動側ピン３６の先端に凹部３６ａを形成したので、可動側ピン３６の位置決め精度の向上をすることができると共に、可動側ピン３６の倒れ防止を図ることができる。
（ｂ）において、図示せぬゲートからキャビティ２３に溶湯を注入する。ここで、固定側ピン２６の凸部２６ａ及び可動側ピン３６の凹部３６ａ周りを図４（ａ）に拡大して示し、詳細に説明する。
【００１５】
図４（ａ），（ｂ）は本発明に係る鋳造用金型の動作を示す第３説明図である。
（ａ）は、図４（ｂ）の４（ａ）拡大図であり、固定側ピン２６の凸部２６ａ及び可動側ピン３６の凹部３６ａ周りを示す。
すなわち、固定側ピン２６と可動側ピン３６の合せ面Ｆをミクロ的に見ると鋳造品ＷにばりＢ，Ｂが発生することがある。
（ｂ）において、成形装置２０の可動盤１２を矢印▲３▼の如く移動することで、型開きを行なう。
【００１６】
図５（ａ），（ｂ）は本発明に係る鋳造用金型の動作を示す第４説明図である。
（ａ）において、駆動シリンダ３８のロッド３８ａを矢印▲４▼の如く動かすことで、鋳造品Ｗから可動側ピン３６の先端を突出させる。
（ｂ）において、鋳造品Ｗから可動側ピン３６の先端を突出させることで、ばりＢ，Ｂを矢印▲６▼，▲６▼の如く削除すると共に削除したばりを鋳造品Ｗの中空部Ｗ１の外に排出することができる。
この結果、鋳造工程の簡素化及び鋳造品Ｗの品質の向上を図ることができる。
【００１７】
図６は本発明に係る鋳造方法を示すフローチャートである。なお、ＳＴ××はステップ番号を示す（符号は図５を参照）。
ＳＴ０１：固定側金型２１に可動側金型２２を型締めをすることでキャビティ２３を形成する。
ＳＴ０２：キャビティ２３内で鋳造品Ｗの中空部Ｗ１を形成するために固定側金型２１から突出させた固定側ピン２６の先端と可動側金型２２から突出させた可動側ピン３６の先端とを合せる。
ＳＴ０３：キャビティ２３に溶湯を注入する。
【００１８】
ＳＴ０４：溶湯が固化した後に型開きを行なう。
ＳＴ０５：可動側ピン３６を固定側金型２１に向かって前進させる。
ＳＴ０６：固定側ピン２６の先端と可動側ピン３６の先端との合せ面Ｆ（図４参照）に発生するバリを取る４と共に鋳造品Ｗの外に排出する。
【００１９】
すなわち、固定側金型２１と可動側金型２２とでキャビティ２３を形成し、このキャビティ２３内に固定側金型２１から鋳造品Ｗの中空部Ｗ１を形成する固定側ピン２６を突出させ、キャビティ２３内に可動側金型２２から鋳造品Ｗの中空部Ｗ１を形成する可動側ピン３６を突出させ、これらのピン２６，３６の先端同士をキャビティ２３内で合せ、キャビティ２３に溶湯を注入し、この溶湯が固化した後に鋳造品Ｗを可動型側金型２２に残しつつ型開きを行ない、次に可動側ピン３６を更に突出することにより、固定側ピン２６の先端と可動側ピン３６の先端との合せ面Ｆに発生するバリＢ，Ｂを取ると共に鋳造品Ｗの外に排出するようにしたので、鋳造工程の簡素化を図れると共に鋳造品Ｗの品質の向上を図ることができる。
【００２０】
尚、実施の形態では図３（ａ）に示すように、固定側金型２１と可動側金型２２との合せ面Ｆで、可動側ピン３６を固定側ピン２６に当てるようにしたがこれに限るものではなく、前記合せ面Ｆを含むキャビティ２３内で合せるようにしたものであればよい。
また、実施の形態では図１に示すように、固定側ピン２６に凸部２６ａを形成し、可動側ピン３６に凹部３６ａを形成したが、これに限るものではなく、固定側ピンに凹部を形成し、可動側ピンに凸部を形成したものであってもよい。
【００２１】
【発明の効果】
本発明は上記構成により次の効果を発揮する。
請求項１は、固定側金型と可動側金型とでキャビティを形成し、このキャビティ内に固定側金型から鋳造品の中空部を形成する固定側ピンを突出させ、キャビティ内に可動側金型から鋳造品の中空部を形成する可動側ピンを突出させ、これらのピンの先端同士をキャビティ内で合せ、キャビティに溶湯を注入し、この溶湯が固化した後に鋳造品を可動型側金型に残しつつ型開きを行ない、次に可動側ピンを更に突出することにより、固定側ピンの先端と可動側ピンの先端との合せ面に発生したバリを取ると共に鋳造品の外に排出するようにしたので、鋳造工程の簡素化及び鋳造品の品質の向上を図ることができる。
また、固定側ピン側又は可動ピン側のどちらか一方に形成された凸部を、可動ピン側又は固定ピン側のどちらか他方に形成された凹部に嵌合させたので、可動側ピンの位置決め精度の向上をすることができる。
【００２２】
請求項２は、固定側金型と可動側金型とでキャビティを形成し、このキャビティ内に固定側金型から鋳造品の中空部を形成する固定側ピンを突出させ、キャビティ内に可動側金型から鋳造品の中空部を形成する可動側ピンを突出させ、これらのピンの先端同士をキャビティ内で合せるようにした鋳造用金型において、この鋳造用金型は、可動側ピンを進退させるピン駆動手段と、固定側ピンを弾性的に支える弾発手段とを備えたものであり、ピン駆動手段を進退させることで、例えば、固定側ピンと可動側ピンとの間に発生するばりを削除すると共に削除したばりを鋳造品の中空部の外に排出することができる。
この結果、鋳造工程の簡素化及び鋳造品の品質の向上を図ることができる。
また、固定側ピン又は可動側ピンのどちらか一方は先端に凸部が形成され、可動側ピン又は固定側ピンのどちらか他方は先端に凸部が嵌合する凹部が形成されたので、可動側ピンの位置決め精度の向上をすることができると共に、可動側ピンの倒れ防止及びズレ防止を図ることができる。
【図面の簡単な説明】
【図１】本発明に係る鋳造用金型の断面図
【図２】本発明に係る鋳造用金型の動作を示す第１説明図
【図３】本発明に係る鋳造用金型の動作を示す第２説明図
【図４】本発明に係る鋳造用金型の動作を示す第３説明図
【図５】本発明に係る鋳造用金型の動作を示す第４説明図
【図６】本発明に係る鋳造方法を示すフローチャート
【符号の説明】
２０…鋳造用金型、２１…固定側金型、２２…可動側金型、２３…キャビティ、２６…固定側ピン、２７…弾発手段（皿ばね）、３６…可動側ピン、３８…ピン駆動手段（駆動シリンダ）。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a casting method and an improvement of a casting mold.
[0002]
[Prior art]
As a casting method and a casting mold, for example, Japanese Patent Application Laid-Open No. 11-19761 “Die Casting Mold” is known.
According to the above technique, according to FIG. 4 of the publication, the die casting die 6 (the sign is the same as the sign of the publication) forms a cavity 8 with a fixed mold 7 and a movable mold 9. A deburring pin for projecting a fixed core 10 forming a casting hole 4 (hollow portion) of the casting 1 from the fixed mold 7 and eliminating a flash 32 generated in the casting hole 4 of the casting 1 from the movable mold 9. 23 is protruded, and the deburring pin 23 is urged by the disc spring 31.
[0003]
[Problems to be solved by the invention]
However, in the mold 6, as shown in FIG. 5, the deburring pin 23 stops in the middle of the casting 1, so that there is a concern that the removed burr is caught in the middle of the casting 1. That is, if burrs remain, it is necessary to remove the burrs with long pins.
Further, if there is a deviation between the tip of the fixed core 10 and the tip of the deburring pin 23, the deburring may not be performed well.
[0004]
Accordingly, an object of the present invention is to provide a casting method and a casting mold capable of reliably taking out a flash generated in a hollow portion of a cast product and discharging the flash outside the hollow portion of the cast product. is there.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a casting method according to claim 1 is a fixed side in which a cavity is formed by a fixed side mold and a movable side mold, and a hollow portion of a cast product is formed from the fixed side mold in the cavity. is protruded pins, is protruded a movable pin for forming the hollow portion of the casting from the movable mold into the cavity, the tips of these pins fit in the cavity, in this case, fixed pin side or movable The convex part formed on one side of the pin is fitted into the concave part formed on the other side of the movable pin side or the fixed pin side , the molten metal is poured into the cavity, and after this molten metal solidifies, the cast product the performs mold opening while leaving the movable mold side mold, followed by that further protrude the movable pin, cast with deburring generated in the mating surfaces of the tip of the tip and the movable pin of the fixed pin That it was discharged outside the product And butterflies.
[0006]
That is, by that further protrude the movable pin after mold opening, is discharged out of the casting together with the deburring occurring mating surface of the distal end of the tip and the movable pin of the fixed pin.
The burr generated on the mating surface between the tip of the fixed pin and the tip of the movable pin is removed and discharged out of the cast product, thereby simplifying the casting process and improving the quality of the cast product.
In addition, since the convex portion formed on either the fixed pin side or the movable pin side is fitted into the concave portion formed on either the movable pin side or the fixed pin side, positioning of the movable pin is performed. The accuracy can be improved.
[0007]
According to a second aspect of the present invention, a cavity is formed by a fixed mold and a movable mold, a fixed pin forming a hollow portion of a cast product is projected from the fixed mold into the cavity, and the movable side is moved into the cavity. In the casting mold in which the movable side pins that form the hollow portion of the cast product are projected from the mold and the tips of these pins are aligned in the cavity, this casting mold advances and retracts the movable side pins. A pin driving means for causing the elastic member to elastically support the fixed side pin ,
One of the fixed side pin and the movable side pin has a convex portion formed at the tip, and the other of the movable side pin and the fixed side pin has a concave portion in which the convex portion is fitted at the tip. .
[0008]
By advancing and retracting the pin driving means, for example, a flash generated between the fixed side pin and the movable side pin is taken and the flash is discharged out of the hollow portion of the cast product.
That is, by advancing and retracting the pin driving means, for example, the flash generated between the fixed side pin and the movable side pin is removed and the flash is discharged out of the hollow portion of the cast product, thereby simplifying the casting process. And improve the quality of castings.
Also, either the fixed pin or the movable pin has a convex portion at the tip, and either the movable pin or the fixed pin has a concave portion that fits the convex portion at the tip. The positioning accuracy of the side pin can be improved, and the movable side pin can be prevented from falling and being displaced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a sectional view of a casting mold according to the present invention, and shows a state in which a casting mold 20 is set in a molding apparatus 10.
The casting mold 20 includes a fixed-side mold 21 that is attached to the stationary platen 11 of the molding apparatus 10 and a movable-side mold 22 that is attached to the movable board 12 of the molding apparatus 20. The movable platen 12 is a member that slides horizontally with a cylinder 13 provided in the molding apparatus 20, 14 is a bed of the molding apparatus 10, and 23 is formed by combining the fixed side mold 21 and the movable side mold 22. The cavity F to be shown indicates a mating surface between the fixed mold 21 and the movable mold 22.
[0010]
The fixed mold 21 is slidably mounted on a mold body 25 with a fixed pin 26 slidable, and a plurality of disc springs 27... (... are a plurality of elastic means for urging the fixed pin 26. A cooling path (not shown) is formed in order to maintain the elastic force of the disc springs 27. That is, the fixed side pin 26 is always urged by the disc springs 27...
The movable die 22 is slidably attached to a die main body 35, and a joint 37 is connected to the movable pin 36. The movable die 36 is used as a pin driving means for moving the movable pin 36 forward and backward. A drive cylinder 38 is connected. The drive cylinder 38 is attached to the movable platen 12 of the molding apparatus 10 and includes a control unit 39 that controls the drive cylinder 38. Reference numeral 38 a denotes a rod of the drive cylinder 38.
[0011]
The fixed side pin 26 is formed with a convex portion 26a at the tip, and the movable side pin 36 is formed with a concave portion 36a at the tip, and the concave portion 36a is fitted to the convex portion 26a so that the movable side pin 36 is centered. And trying to keep steady. That is, since the convex portion 26a is formed at the tip of the fixed side pin 26 and the concave portion 36a is formed at the tip of the movable side pin 36, the positioning accuracy of the movable side pin 36 can be improved and the movable side pin 36 can be improved. Can be prevented from falling and preventing misalignment.
[0012]
The casting mold 20 includes a fixed mold 21 and a movable mold 22 that form a cavity 23, and a fixed-side pin that forms a hollow portion of the cast product from the fixed mold 21 in the cavity 23. 26, a movable side pin 36 that forms a hollow portion of the cast product is projected from the movable side mold 22 in the cavity 23, and the tips of these pins 26, 36 are aligned in the cavity 23. The casting mold 20 includes a drive cylinder 38 that moves the movable side pin 36 forward and backward, and a disc spring 27 that elastically supports the fixed side pin 26. By moving the cylinder 38 back and forth, for example, the flash generated between the fixed side pin 26 and the movable side pin 36 can be deleted and the deleted flash can be discharged out of the hollow portion of the cast product.
As a result, it is possible to simplify the casting process and improve the quality of the cast product.
[0013]
Next, the operation of the casting mold 20 described above will be described.
FIGS. 2A and 2B are first explanatory views showing the operation of the casting mold according to the present invention.
In (a), the fixed side mold 21 is attached to the fixed platen 11 (see FIG. 1) of the molding apparatus 10, and the movable side mold 22 is attached to the movable platen 12 of the molding apparatus 20.
In (b), the movable plate 12 of the molding apparatus 20 is moved as shown by the arrow (1), so that the movable die 22 is fitted to the fixed die 21.
[0014]
FIGS. 3A and 3B are second explanatory views showing the operation of the casting mold according to the present invention.
In (a), the rod 38a of the drive cylinder 38 is advanced as shown by the arrow (2), the tip of the movable pin 36 is brought into contact with the tip of the fixed pin 26, and the fixed pin 26 is moved by a predetermined distance with the movable pin 36. Just press. At this time, the concave portion 36 a of the movable side pin 36 is fitted into the convex portion of the fixed side pin 26.
Since the convex portion 26a is formed at the tip of the fixed side pin 26 and the concave portion 36a is formed at the tip of the movable side pin 36, the positioning accuracy of the movable side pin 36 can be improved and the movable side pin 36 is tilted. Prevention can be achieved.
In (b), molten metal is poured into the cavity 23 from a gate (not shown). Here, the convex portion 26a of the fixed side pin 26 and the periphery of the concave portion 36a of the movable side pin 36 are enlarged and shown in FIG. 4A, and will be described in detail.
[0015]
4A and 4B are third explanatory views showing the operation of the casting mold according to the present invention.
4A is an enlarged view of 4A of FIG. 4B, and shows the periphery of the convex portion 26a of the fixed side pin 26 and the concave portion 36a of the movable side pin 36. FIG.
That is, when the mating surface F of the fixed side pin 26 and the movable side pin 36 is viewed microscopically, flashes B and B may be generated on the cast product W.
In (b), the mold is opened by moving the movable platen 12 of the molding apparatus 20 as shown by the arrow (3).
[0016]
5A and 5B are fourth explanatory views showing the operation of the casting mold according to the present invention.
In (a), the tip of the movable side pin 36 is projected from the casting W by moving the rod 38a of the drive cylinder 38 as shown by the arrow (4).
In (b), by projecting the tip of the movable pin 36 from the casting W, the flashes B and B are deleted as indicated by arrows (6) and (6), and the deleted flash is the hollow portion W1 of the cast product W. Can be discharged outside.
As a result, the casting process can be simplified and the quality of the cast product W can be improved.
[0017]
FIG. 6 is a flowchart showing a casting method according to the present invention. Note that STxx indicates a step number (see FIG. 5 for symbols).
ST01: The cavity 23 is formed by clamping the movable side mold 22 to the fixed side mold 21.
ST02: The tip of the fixed side pin 26 protruded from the fixed side mold 21 and the tip of the movable side pin 36 protruded from the movable side mold 22 to form the hollow portion W1 of the casting W in the cavity 23. Match.
ST03: The molten metal is injected into the cavity 23.
[0018]
ST04: Open the mold after the molten metal has solidified.
ST05: Move the movable pin 36 forward toward the fixed die 21.
ST06: Burst 4 generated on the mating surface F (see FIG. 4) between the tip of the fixed pin 26 and the tip of the movable pin 36 is discharged out of the casting W.
[0019]
That is, a cavity 23 is formed by the fixed mold 21 and the movable mold 22, and a fixed pin 26 that forms the hollow portion W1 of the cast product W is projected from the fixed mold 21 into the cavity 23. The movable side pin 36 that forms the hollow portion W1 of the cast product W is protruded from the movable side mold 22 into the cavity 23, the tips of these pins 26 and 36 are aligned in the cavity 23, and the molten metal is injected into the cavity 23. and the casting W performs mold opening while leaving the movable mold side mold 22 after the molten metal has solidified, the next thing that further protrude the movable pin 36, the distal end and the movable pin of the fixed pin 26 Since the burrs B and B generated on the mating surface F with the tip of 36 are removed and discharged out of the cast product W, the casting process can be simplified and the quality of the cast product W can be improved. it can.
[0020]
In the embodiment, as shown in FIG. 3A, the movable side pin 36 is brought into contact with the fixed side pin 26 at the mating surface F of the fixed side mold 21 and the movable side mold 22. However, the present invention is not limited to this, and any material may be used as long as it is matched within the cavity 23 including the mating surface F.
In the embodiment, as shown in FIG. 1, the convex portion 26a is formed on the fixed side pin 26 and the concave portion 36a is formed on the movable side pin 36. However, the present invention is not limited to this, and the concave portion is formed on the fixed side pin. It may be formed and a convex part may be formed on the movable side pin.
[0021]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to a first aspect of the present invention, a cavity is formed by a fixed side mold and a movable side mold, a fixed side pin forming a hollow portion of a cast product is projected from the fixed side mold into the cavity, and the movable side is moved into the cavity. The movable pins that form the hollow part of the cast product are projected from the mold, the tips of these pins are aligned in the cavity, the molten metal is injected into the cavity, and after the molten metal has solidified, the cast product is moved to the movable mold side die. performs mold opening while leaving the mold, the next thing that further protrude the movable pin, discharged out of the casting together with the deburring generated in the mating surfaces of the tip of the tip and the movable pin of the fixed pin As a result, the casting process can be simplified and the quality of the cast product can be improved.
In addition, since the convex portion formed on either the fixed pin side or the movable pin side is fitted into the concave portion formed on either the movable pin side or the fixed pin side, positioning of the movable pin is performed. The accuracy can be improved.
[0022]
According to a second aspect of the present invention, a cavity is formed by a fixed mold and a movable mold, a fixed pin forming a hollow portion of a cast product is projected from the fixed mold into the cavity, and the movable side is moved into the cavity. In the casting mold in which the movable side pins that form the hollow portion of the cast product are projected from the mold and the tips of these pins are aligned in the cavity, this casting mold advances and retracts the movable side pins. For example, the flash generated between the fixed side pin and the movable side pin can be eliminated by moving the pin drive unit back and forth. At the same time, the deleted flash can be discharged out of the hollow portion of the casting.
As a result, it is possible to simplify the casting process and improve the quality of the cast product.
Also, either the fixed pin or the movable pin has a convex portion at the tip, and either the movable pin or the fixed pin has a concave portion that fits the convex portion at the tip. The positioning accuracy of the side pin can be improved, and the movable side pin can be prevented from falling and being displaced.
[Brief description of the drawings]
FIG. 1 is a sectional view of a casting mold according to the present invention. FIG. 2 is a first explanatory view showing the operation of the casting mold according to the present invention. FIG. 3 shows the operation of the casting mold according to the present invention. FIG. 4 is a third explanatory diagram illustrating the operation of the casting mold according to the present invention. FIG. 5 is a fourth explanatory diagram illustrating the operation of the casting mold according to the present invention. Flow chart showing a casting method according to the invention
DESCRIPTION OF SYMBOLS 20 ... Casting die, 21 ... Fixed side die, 22 ... Movable side die, 23 ... Cavity, 26 ... Fixed side pin, 27 ... Bulleting means (disc spring), 36 ... Movable side pin, 38 ... Pin Drive means (drive cylinder).

Claims

A cavity is formed by a fixed mold and a movable mold, a fixed pin forming a hollow portion of a cast product is projected from the fixed mold into the cavity, and a cast product from the movable mold is inserted into the cavity. Projecting the movable side pins forming the hollow portion of these, and aligning the tips of these pins within the cavity, at this time, the convex portion formed on either the fixed side pin or the movable side pin, The mold is fitted into a recess formed on the other of the movable side pin or the fixed side pin , molten metal is poured into the cavity, and the mold is opened while leaving the cast product in the movable mold side mold after the molten metal has solidified. no rows, by then that further projecting said movable pins, that it has to be discharged out of the casting together with the deburring generated in the mating surfaces of the tip of the tip and the movable pin of the fixed pin Casting method characterized.

A cavity is formed by a fixed mold and a movable mold, a fixed pin forming a hollow portion of a cast product is projected from the fixed mold into the cavity, and a cast product from the movable mold is inserted into the cavity. In the casting mold in which the movable side pins forming the hollow portion of the projecting portion are projected and the tips of these pins are aligned in the cavity,
The casting mold includes pin driving means for moving the movable side pin forward and backward, and elastic means for elastically supporting the fixed side pin ,
Either the fixed side pin or the movable side pin has a convex portion formed at the tip, and the other of the movable side pin or the fixed side pin has a concave portion that fits the convex portion at the tip . A casting mold characterized by that.