JP2006167780A - Mold and method for sealing mold - Google Patents

Mold and method for sealing mold Download PDF

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JP2006167780A
JP2006167780A JP2004366160A JP2004366160A JP2006167780A JP 2006167780 A JP2006167780 A JP 2006167780A JP 2004366160 A JP2004366160 A JP 2004366160A JP 2004366160 A JP2004366160 A JP 2004366160A JP 2006167780 A JP2006167780 A JP 2006167780A
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mold
powder
casting
cavity
sealing
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JP4682612B2 (en
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Masami Tashiro
政巳 田代
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Nissan Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for casting, having high working ratio and a method for sealing the mold by which the sealing state is sufficiently ensured and the checking and exchanging of a sealing member is hardly required. <P>SOLUTION: A holding part S for holding powdery material P is formed at near a cavity C of constituting members 16, 19 arranged at the surrounding of the cavity C in the mold, and the powdery material P filled up in the holding part S is pushed and hardened to close and seal the gap between the constituting members 16, 19 and the mold. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、例えば、ダイカスト鋳造などで使用される金型と、当該金型のシール方法に関する。   The present invention relates to a mold used in, for example, die casting and a method for sealing the mold.

例えば、ダイカスト鋳造法は、薄肉で精密な鋳物製品を大量に生産する技術として知られている。この鋳造法では、短時間に金型のキャビティ内に溶湯を充填するために、高速、高圧で溶湯を充填しているが、キャビティ内の空気は、その大部分が高速で流入する溶湯にトラップされ、鋳巣欠陥等のある鋳物になることがある。このため、キャビティ内を負圧状態にし、溶湯を溶湯保持部から射出スリーブ内に、差圧を利用して充填している（特許文献１、特許文献２参照）。   For example, the die casting method is known as a technique for mass-producing a thin and precise casting product. In this casting method, in order to fill the mold cavity in a short time with the molten metal, the molten metal is filled at high speed and high pressure, but most of the air in the cavity is trapped in the molten metal flowing in at high speed. In some cases, the casting may have a casting hole defect. For this reason, the inside of a cavity is made into a negative pressure state, and the molten metal is filled into the injection sleeve from the molten metal holding part using the differential pressure (see Patent Document 1 and Patent Document 2).

一方、ダイカスト鋳造用の金型は、嵌込型、押出ピン、中子ピン、スライドコアなど、数十〜数百の構成部材が複雑に組み合わされており、キャビティ内を負圧状態にすると、組み合わされる構成部材の合わせ面相互の間を通って、外部からキャビティ内に空気が流入し、キャビティ内の負圧状態を維持することができない虞がある。このため、キャビティ内に流入してきた溶湯がガスを巻き込み、鋳巣欠陥等が発生しやすくなる。   On the other hand, a die casting die has a complex combination of several tens to several hundreds of components such as a fitting die, an extrusion pin, a core pin, and a slide core. There is a possibility that air flows into the cavity from the outside through the mating surfaces of the constituent members to be combined, and the negative pressure state in the cavity cannot be maintained. For this reason, the molten metal that has flowed into the cavity entrains the gas and easily causes defects in the cast hole.

このため、構成部材相互の合わせ面などにＯリングを設置してシールし、負圧状態の維持を図っている。
特開昭５７−１５２３６１号公報 特許第２６４５４８８号 For this reason, O-rings are installed and sealed on the mating surfaces of the constituent members to maintain a negative pressure state.
JP 57-152361 A Japanese Patent No. 2645488

しかし、摺動部分にシール材として、Ｏリングを設けると、摺動による劣化や欠損が生じ、シール状態が不十分になりやすく、負圧状態を確保できなくなる。負圧状態確保のため、Ｏリングの状態を頻繁に点検交換すると、稼働率が低下する虞がある。特に、ダイカスト鋳造用の金型は、多数の構成部材が複雑に組み合わされているので、Ｏリングの確認自体容易な作業ではない。   However, if an O-ring is provided as a sealing material at the sliding portion, deterioration or loss due to sliding occurs, the sealing state tends to be insufficient, and a negative pressure state cannot be secured. If the state of the O-ring is frequently inspected and replaced to ensure a negative pressure state, the operating rate may be reduced. In particular, a die for casting is a work in which an O-ring is not easily confirmed because a large number of constituent members are combined in a complicated manner.

本発明は、上記従来技術に伴う課題を解決するためになされたものであり、シール状態が十分に確保され、しかもシール部材の点検交換の必要が少なく、稼働率が高い金型およびシール方法を提供することを目的とする。   The present invention has been made in order to solve the problems associated with the above-described prior art, and provides a mold and a sealing method in which a sealing state is sufficiently ensured, the inspection member need not be inspected and replaced, and the operation rate is high. The purpose is to provide.

本発明は、上述の目的を達成するため、金型のキャビティ周辺に設けられた構成部材のキャビティ近傍に、粉体を収容する収容部を形成し、当該収容部内に充填した粉体を押し固めることにより前記構成部材と金型との隙間を閉塞しシールすることを特徴とする鋳造用の金型である。   In order to achieve the above-mentioned object, the present invention forms an accommodating portion for accommodating powder in the vicinity of a cavity of a component member provided around the cavity of the mold, and presses and solidifies the powder filled in the accommodating portion. Thus, the casting mold is characterized in that the gap between the component member and the mold is closed and sealed.

また、上記目的を達成する他の発明は、金型のキャビティ周辺に設けられた構成部材に対して、その構成部材のキャビティ近傍に形成され、粉体を収容する収容部に向けて粉体を塗布する塗布工程と、当該粉体を固化する固化工程と、を有する鋳造用の金型のシール方法である。   In another aspect of the invention for achieving the above object, the powder is directed toward the housing portion that is formed near the cavity of the component member, and accommodates the powder, with respect to the component member provided around the cavity of the mold. A casting mold sealing method having a coating step of coating and a solidification step of solidifying the powder.

請求項１の発明によれば、金型のキャビティ周辺に設けられた構成部材のキャビティ近傍に、粉体を収容する収容部を形成し、収容部内に充填した粉体を押し固めるにより構成部材と収容部との隙間を閉塞しシールするので、金型のキャビティ内の負圧状態が確保され、鋳巣欠陥などの不具合が発生することが防止される。また、熱により劣化しあるいは欠損を生ずることがないので、シール材としての点検交換をほとんど行う必要がない。   According to the first aspect of the present invention, the component member is formed by forming the accommodating portion for accommodating the powder in the vicinity of the cavity of the component member provided around the cavity of the mold and pressing the powder filled in the accommodating portion. Since the gap with the housing portion is closed and sealed, a negative pressure state in the cavity of the mold is ensured, and problems such as defects in the cast hole are prevented. Further, since there is no deterioration or loss due to heat, there is almost no need to perform inspection and replacement as a sealing material.

請求項２の発明によれば、収容部を金型に摺動自在に設けられたスライドピン若しくは当該スライドピン近傍の金型に設けたので、スライドピンの摺動を利用して、粉体をシール材として機能させ、負圧状態を維持し、鋳巣欠陥などの発生を防止できる。   According to the second aspect of the present invention, since the accommodating portion is provided on the slide pin provided in the mold so as to be slidable or in the mold in the vicinity of the slide pin, the slide is used to slide the powder. It can function as a sealing material, maintain a negative pressure state, and prevent the occurrence of defects in the casting cavity.

請求項３の発明によれば、収容部を金型に摺動自在に設けられたスライドコア若しくは当該スライドコア近傍の金型に設けたので、スライドコアの摺動を利用して、粉体をシール材として機能させ、負圧状態を維持し、鋳巣欠陥などの発生を防止できる。   According to the invention of claim 3, since the accommodating portion is provided in the slide core provided in the mold so as to be slidable or in the mold in the vicinity of the slide core. It can function as a sealing material, maintain a negative pressure state, and prevent the occurrence of defects in the casting cavity.

請求項４の発明によれば、収容部を嵌込型のうちの少なくも一方の合わせ面に設けた凹溝により形成したので、収容部の粉体がシール材として機能し、型合せが気密にでき、鋳巣欠陥などの発生を確実に防止できる。   According to the invention of claim 4, since the accommodating portion is formed by the concave groove provided on at least one of the fitting molds, the powder of the accommodating portion functions as a sealing material, and the mold matching is airtight. Therefore, it is possible to reliably prevent the occurrence of defects such as casting defects.

請求項５の発明によれば、粉体として珪酸塩が混合されたものを用いると、珪酸塩が粉体相互のバインダとなり、粉体相互の密着状態が維持され、粉体間の隙間が埋められ、よりシール性が向上する。   According to the invention of claim 5, when powder mixed with silicate is used, the silicate serves as a binder between the powders, the adhesion between the powders is maintained, and the gap between the powders is filled. Therefore, the sealing performance is further improved.

請求項６の発明によれば、金型のキャビティ周辺に設けられた構成部材のキャビティ近傍に、粉体を収容する収容部を形成し、当該収容部に向けて粉体を塗布し、当該粉体を固化させるので、迅速かつ確実に、収容部の粉体相互を密着させることができ、収容部の粉体をよりシール性に優れるものとすることができる。   According to the invention of claim 6, an accommodating portion for accommodating the powder is formed in the vicinity of the cavity of the component member provided around the cavity of the mold, the powder is applied toward the accommodating portion, and the powder Since the body is solidified, the powder in the container can be brought into close contact with each other quickly and reliably, and the powder in the container can be made more excellent in sealability.

請求項７の発明によれば、塗布工程と固化工程とを繰り返し行うと、よりシール性にすぐれた収容部となる。   According to the seventh aspect of the present invention, when the coating process and the solidifying process are repeated, the housing portion is more excellent in sealing performance.

請求項８の発明によれば、構成部材を変位することにより粉体を固化させると、簡単に粉体をより密着させることができる。またこの変位は、鋳造時に行われる通常の動作となり、固化のための器具を別途用意することなく、収容部とすることができる。たとえば、スライドピンの外周面または当該外周面に接する他の構成部材の接触面に収容部を形成し、ここに粉体を収容させてシール材を形成する場合であれば、スライドピンまたはこれに接する他の構成部材を進退移動させる動作を固化工程として用いることができる。また、一対の嵌込型の一方または両方の合わせ面に収容部を設ける場合は、両嵌込型を相互に密接させて型締めする動作を固化工程として用いることができる。   According to the eighth aspect of the present invention, when the powder is solidified by displacing the constituent members, the powder can be more easily adhered. Moreover, this displacement becomes a normal operation performed at the time of casting, and it can be set as the accommodating portion without separately preparing a tool for solidification. For example, if the housing portion is formed on the outer peripheral surface of the slide pin or the contact surface of another component member that is in contact with the outer peripheral surface, and the sealing material is formed by accommodating powder here, the slide pin or the The operation of moving other constituent members in contact with each other can be used as the solidification step. Moreover, when providing an accommodating part in the mating surface of one or both of a pair of fitting type | molds, the operation | work which clamps both fitting type | molds mutually and can clamp can be used as a solidification process.

請求項９の発明によれば、粉体に珪酸塩が混合されていると、簡単かつ確実に、粉体相互の密着状態を維持できるとともに粉体相互間の隙間を埋めることができ、収容部によりシール性に優れるシール材を形成することができる。   According to the ninth aspect of the present invention, when the silicate is mixed in the powder, the adhesion state between the powders can be maintained easily and surely, and the gap between the powders can be filled, and the accommodating portion Thus, a sealing material having excellent sealing properties can be formed.

以下、本発明の実施の形態を、図面を参照しつつ説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本発明に係る実施形態の鋳造用の金型を示す断面図、図２は後退した可動嵌込型を示す断面図である。なお、本実施形態では、代表的な型構成部材として、一組のスライドピン１６と、１つのスライドコア１９を例示的に示し、他のものについては、図示を省略している。   FIG. 1 is a sectional view showing a casting mold according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a retractable movable fitting mold. In the present embodiment, as a typical mold component member, a set of slide pins 16 and one slide core 19 are exemplarily shown, and the other components are not shown.

図１に示すように、鋳造用の金型Ｄは、その構成部材として、固定おも型１内に嵌め込まれた固定嵌込型２と、可動おも型１１内に嵌め込まれた可動嵌込型１２と、からなる一対の嵌込型を有している。固定嵌込型２および可動嵌込型１２は、それぞれ、他方の嵌込型に向けられた合わせ面２ａ，１２ａを有し、各合わせ面２ａ，１２ａには、鋳造物の形状に対応して凹んだ鋳型面２ｂ，１２ｂが形成されている。   As shown in FIG. 1, a casting mold D includes, as its constituent members, a fixed fitting mold 2 fitted in a fixed mold 1 and a movable fitting fitted in a movable mold 11. A mold 12 and a pair of fitting molds. The fixed fitting mold 2 and the movable fitting mold 12 each have mating surfaces 2a and 12a directed to the other fitting mold, and the mating surfaces 2a and 12a correspond to the shape of the casting. Recessed mold surfaces 2b and 12b are formed.

可動嵌込型１２を含む可動型ユニットは、固定嵌込型２を含む固定型ユニットに対して進退移動可能に設置されており、可動嵌込型１２を固定嵌込型２に向けて前進移動させると、両嵌込型２，１２の合わせ面２ａ，１２ａが対面接触して型締め状態になり、各合わせ面２ａ，１２ａの鋳型面２ｂ，１２ｂに囲まれたキャビティＣが形成される。固定おも型１と固定嵌込型２とを型締めした状態で両型をシールするＯリング１３が設置されている。   The movable unit including the movable fitting mold 12 is installed so as to be movable forward and backward with respect to the fixed mold unit including the fixed fitting mold 2, and the movable fitting mold 12 is moved forward toward the fixed fitting mold 2. As a result, the mating surfaces 2a and 12a of both fitting molds 2 and 12 come into contact with each other to be in a clamped state, and a cavity C surrounded by the mold surfaces 2b and 12b of the mating surfaces 2a and 12a is formed. An O-ring 13 that seals both the fixed mold 1 and the fixed fitting mold 2 is installed.

可動おも型１１には、進退移動方向に延びる貫通穴１４が形成されており、可動嵌込型１２には、貫通穴１４よりも小径で進退移動方向に延びる挿入穴１５が形成されている。貫通穴１４および挿入穴１５は連通しており、挿入穴１５の、貫通穴１４側とは反対側の端部は、あわせ面１２ａに形成された鋳型面１２ｂに達している。そして、可動嵌込型１２の挿入孔１５には、可動おも型１１の貫通穴１４側からスライドピン１６が差し込まれている。   A through hole 14 extending in the forward / backward movement direction is formed in the movable mold 11, and an insertion hole 15 having a smaller diameter than the through hole 14 and extending in the forward / backward movement direction is formed in the movable fitting mold 12. . The through hole 14 and the insertion hole 15 communicate with each other, and the end of the insertion hole 15 opposite to the through hole 14 side reaches the mold surface 12b formed on the mating surface 12a. A slide pin 16 is inserted into the insertion hole 15 of the movable fitting mold 12 from the through hole 14 side of the movable mold 11.

スライドピン１６は、鋳造された鋳造物を金型のキャビティＣ内から取り出す際に用いられるものであり、その基端部が押出板１７および支持板１８に固定され、これら押出板１７および支持板１８により可動嵌込型１２に対して相対的に進退移動可能になっている。スライドピン１６は、原位置（図１に示す状態）まで後退移動すると、先端が、可動嵌込型１２の鋳型面１２ｂからキャビティＣ内に突出しない状態になる。他方、図２に示すように、スライドピン１６を可動おも型１１および可動嵌込型１２に対して相対的に前進移動させると、先端は、可動嵌込型１２の鋳型面１２ｂから突き出した状態になる。   The slide pin 16 is used when the cast product is taken out from the cavity C of the mold, and the base end portion thereof is fixed to the extrusion plate 17 and the support plate 18, and the extrusion plate 17 and the support plate. 18 is movable forward and backward relative to the movable fitting mold 12. When the slide pin 16 moves backward to the original position (the state shown in FIG. 1), the tip does not protrude from the mold surface 12b of the movable fitting mold 12 into the cavity C. On the other hand, as shown in FIG. 2, when the slide pin 16 is moved forward relative to the movable mold 11 and the movable fitting mold 12, the tip protrudes from the mold surface 12 b of the movable fitting mold 12. It becomes a state.

図３（Ａ）は鋳型面から突出したスライドピンの先端部を示す側面図、図３（Ｂ）は可動嵌込型内に退避した状態のスライドピンを示す側面図、図４（Ａ）は先端部に粉体が塗布された状態のスライドピンを示す側面図、図４（Ｂ）は塗布後後退したスライドピンの状態を示す側面図である。   3A is a side view showing the tip of the slide pin protruding from the mold surface, FIG. 3B is a side view showing the slide pin in a state of being retracted into the movable fitting mold, and FIG. FIG. 4B is a side view showing the state of the slide pin that has been retracted after application, and FIG.

特に、本実施形態では、図３（Ａ）に示すように、前進移動したときに可動嵌込型１２の鋳型面１２ｂから突出するスライドピン１６の先端部外周面に、粉体Ｐを収容する収容部Ｓとしてのリング状の溝部１６ａが形成されている。   In particular, in the present embodiment, as shown in FIG. 3A, the powder P is accommodated on the outer peripheral surface of the distal end portion of the slide pin 16 that protrudes from the mold surface 12b of the movable fitting mold 12 when moved forward. A ring-shaped groove 16a as the accommodating portion S is formed.

ダイカスト鋳造用の金型では、鋳造時に、金型に離型剤としての粉体Ｐを塗布し、その後型締めを行って鋳造を行うが、本実施形態では、型締め前の金型に塗布する粉体Ｐを、図４（Ａ）に示すように、スライドピン１６を突出させておくことで、外周部に形成した溝部１６ａに粉体Ｐが自動的に、通常の動作内で塗布され、これを図４（Ｂ）に示すように、離型剤塗布後のスライドピン１６が原位置に戻ることにより自動的に押し固め、スライドピン１６と可動嵌込型１２の鋳型面１２ｂとの間の隙間を塞ぎ、シール性を高めている。なお、粉体としては、たとえば、雲母、黒鉛、タルク、セラミック、ワックスあるいは金属石鹸などからなる耐熱性の粉体が好ましく、また、溝部１６ａの深さとしては、０．０５ｍｍ以上が好ましい。   In the die casting mold, at the time of casting, the powder P as a release agent is applied to the mold, and then the mold is clamped to perform casting. In this embodiment, the mold is applied to the mold before clamping. As shown in FIG. 4A, the powder P is automatically applied to the groove 16a formed in the outer peripheral portion within the normal operation by causing the slide pin 16 to protrude. As shown in FIG. 4B, the slide pin 16 after the release agent is applied is automatically compressed by returning to the original position, and the slide pin 16 and the mold surface 12b of the movable fitting mold 12 are fixed. The gap between them is closed to improve the sealing performance. As the powder, for example, a heat-resistant powder made of mica, graphite, talc, ceramic, wax or metal soap is preferable, and the depth of the groove 16a is preferably 0.05 mm or more.

したがって、収容部Ｓは、離型剤として塗布される粉体Ｐが収容される部分であることから、キャビティＣの周辺であって、金型の構成部材のキャビティ近傍に設けられることが好ましい。つまり、粉体Ｐを収容する収容部Ｓとしては、スライドピン１６の外周部に形成した溝部１６ａのみでなくスライドピン近傍の金型に形成してもよい。   Therefore, since the accommodating part S is a part in which the powder P applied as a mold release agent is accommodated, the accommodating part S is preferably provided around the cavity C and in the vicinity of the cavity of the component member of the mold. That is, the accommodating portion S that accommodates the powder P may be formed not only in the groove portion 16 a formed in the outer peripheral portion of the slide pin 16 but also in a mold near the slide pin.

また、収容部Ｓは、スライドコア１９若しくは当該スライドコア近傍の金型に形成してもよい。   Moreover, you may form the accommodating part S in the metal mold | die of the slide core 19 or the said slide core vicinity.

図５（Ａ）はスライドコアの後退した状態を示す側面図、（Ｂ）は粉体塗布後スライドコアが前進した状態を示す側面図である。   FIG. 5A is a side view showing a state in which the slide core is retracted, and FIG. 5B is a side view showing a state in which the slide core is advanced after powder application.

スライドコア１９は、図１に示すように、ピストンシリンダ２０によって、可動おも型１１の進退移動方向と直交する方向に進退移動されるものであり、突き当て位置まで前進すると、両嵌込型２，１２と接する状態になり、キャビティＣの輪郭の一部を構成する。   As shown in FIG. 1, the slide core 19 is moved forward and backward in a direction orthogonal to the forward and backward movement direction of the movable main die 11 by the piston cylinder 20. 2 and 12 and is part of the contour of the cavity C.

したがって、ここにも収容部Ｓを形成すれば、スライドピン１６の場合と同様、鋳造時に行われる通常の動作で、粉体Ｐを押し固めることができ、固化のための器具を別途用意する必要がない。この押し固めによりスライドコア１９と可動嵌込型１２の鋳型面１２ｂなどとの間の隙間を塞ぎ、シール性を高めることができる。   Therefore, if the accommodating portion S is formed here, the powder P can be pressed and solidified by a normal operation performed at the time of casting, as in the case of the slide pin 16, and it is necessary to prepare a separate tool for solidification. There is no. By this compaction, the gap between the slide core 19 and the mold surface 12b of the movable fitting mold 12 can be closed, and the sealing performance can be improved.

図５（Ａ）に示すように、可動嵌込型１２の、スライドコア１９との摺動面に、収容部Ｓとしての凹部１２ｄを形成する。凹部１２ｄは、図５（Ｂ）に示すように、スライドコア１９が型締め位置まで前進すると、スライドコア１９と接触し、退避すると、図５（Ａ）に示すように、キャビティＣに露出する状態になる。このため、凹部１２ｄに粉体Ｐを供給すると、その移動変位動作により粉体Ｐは押し固められることになる。なお、この凹部１２ｄの深さとしては、０．０５ｍｍ以上が好ましい。なお、可動嵌込型１２側ではなく、場合によってはスライドコア１９に収容部Ｓとしての凹部を設けてもよい。   As shown in FIG. 5 (A), a recess 12d as the accommodating portion S is formed on the sliding surface of the movable fitting mold 12 with the slide core 19. As shown in FIG. 5 (B), the recess 12d comes into contact with the slide core 19 when the slide core 19 moves forward to the mold clamping position, and is exposed to the cavity C when retracted as shown in FIG. 5 (A). It becomes a state. For this reason, when the powder P is supplied to the recess 12d, the powder P is pressed and solidified by the movement displacement operation. In addition, as the depth of this recessed part 12d, 0.05 mm or more is preferable. In addition, you may provide the recessed part as the accommodating part S in the slide core 19 depending on the case instead of the movable fitting type | mold 12 side.

さらに、粉体Ｐの塗布と押し固めにつき詳述する。   Further, the application and compaction of the powder P will be described in detail.

シール材として用いられる粉体Ｐの塗布は、まず、図２に示すように、可動おも型１１および可動嵌込型１２を退避位置まで後退させ、スライドコア１９も退避位置に後退させる。これにより可動嵌込型１２の、スライドコア１９との接触面に形成されている凹部１２ｄが外部に露出する。また、図３（Ａ）に示すように、スライドピン１６の先端を、可動嵌込型１２の鋳型面１２ｂから突出させると、スライドピン１６の先端の外周部に形成した溝部１６ａが外部に露出する。   Application of the powder P used as the sealing material is performed by first retracting the movable mold 11 and the movable fitting mold 12 to the retracted position and the slide core 19 also retracted to the retracted position, as shown in FIG. Thereby, the recessed part 12d currently formed in the contact surface with the slide core 19 of the movable fitting type | mold 12 is exposed outside. As shown in FIG. 3A, when the tip of the slide pin 16 is protruded from the mold surface 12b of the movable fitting mold 12, the groove 16a formed on the outer periphery of the tip of the slide pin 16 is exposed to the outside. To do.

この状態で、図２に示す塗布装置の噴出ノズル２１から可動嵌込型１２のキャビティＣに向けて、離型剤として機能する粉体Ｐと、無機系接着剤である珪酸塩との混合物を塗布すると、可動嵌込型１２の鋳型面１２ｂのみならず、図４（Ａ）や図５（Ａ）に示すように、スライドピン１６の溝部１６ａの表面や、可動嵌込型１２の凹部１２ｄの表面に粉体Ｐが付着する。   In this state, a mixture of powder P functioning as a mold release agent and silicate as an inorganic adhesive is directed from the ejection nozzle 21 of the coating apparatus shown in FIG. 2 toward the cavity C of the movable fitting mold 12. When applied, not only the mold surface 12b of the movable fitting mold 12 but also the surface of the groove 16a of the slide pin 16 or the recess 12d of the movable fitting mold 12 as shown in FIGS. 4A and 5A. Powder P adheres to the surface.

その後、スライドピン１６の押出板１７および支持板１８を後退させると、図４（Ｂ）に示すように、スライドピン１６の溝部１６ａの表面に付着した粉体Ｐが確実に溝部１６ａ内に収容される。また、スライドコア１９を突き当て位置まで前進移動させると、図５（Ｂ）に示されるように、移動してきたスライドコア１９によって可動嵌込型１２の凹部１２ｄ内に粉体Ｐが収容される。   Thereafter, when the extrusion plate 17 and the support plate 18 of the slide pin 16 are retracted, the powder P adhering to the surface of the groove portion 16a of the slide pin 16 is reliably accommodated in the groove portion 16a as shown in FIG. Is done. Further, when the slide core 19 is moved forward to the abutting position, the powder P is accommodated in the recessed portion 12d of the movable fitting mold 12 by the moved slide core 19 as shown in FIG. .

そして、上述した塗布工程と、金型の構成部材を移動させて付着した粉体Ｐを押し固めるように収容部Ｓに収容させる工程（固化工程）とを数回繰り返すと、粉体Ｐが溝部１６ａや凹部１２ｄなどの収容部Ｓに収容され堆積するとともに、強固に押し固められる。また、塗布された混合物には接着剤である珪酸塩が含まれており、各収容部Ｓに収容された粉体Ｐは強固に接着された状態になる。   Then, when the above-described coating process and the process (solidification process) in which the powder P adhering by moving the component member of the mold is pressed and solidified are repeated several times, the powder P becomes a groove part. It is housed and deposited in the housing part S such as 16a and the recess 12d and is firmly pressed. Moreover, the applied mixture contains silicate which is an adhesive, and the powder P accommodated in each accommodating part S is in a strongly adhered state.

この結果、収容部Ｓの粉体Ｐは、スライドピン１６やスライドコア１９と金型との間の隙間を塞ぎ、シール材としても機能することになる。   As a result, the powder P in the storage portion S closes the gap between the slide pin 16 or slide core 19 and the mold, and functions as a sealing material.

なお、実験によれば、塗布装置の噴出ノズル２１から噴出させた混合物は、水が９５重量％以上、離型成分でもある粉体が３重量％、接着剤である珪酸塩が１重量％程度、が好ましいことが判明している。     In addition, according to the experiment, the mixture ejected from the ejection nozzle 21 of the coating apparatus is 95% by weight or more of water, 3% by weight of powder which is a release component, and about 1% by weight of silicate which is an adhesive. Has been found to be preferred.

このようにしてシール材が形成されると、鋳造用の金型を型締めし、真空ポンプでキャビティＣ内を負圧状態する。そして、金型に接続された射出スリーブ３０（図１参照）に、シドル３３やストーク（不図示）を用いて溶湯を供給し、射出スリーブ３０のピストン３１を作動して高速、高圧でキャビティＣ内に溶湯を充填して鋳造を行う。   When the sealing material is formed in this manner, the casting mold is clamped and the inside of the cavity C is brought into a negative pressure state by a vacuum pump. Then, molten metal is supplied to the injection sleeve 30 (see FIG. 1) connected to the mold by using a side 33 or a stalk (not shown), and the piston 31 of the injection sleeve 30 is operated to operate the cavity C at high speed and high pressure. Casting is performed by filling the inside with molten metal.

この鋳造時において、キャビティＣ内の負圧状態は、Ｏリングでシールした従来の場合と同等の負圧状態を確保でき、鋳巣欠陥等の不具合の発生を最小限に防止することができる。   At the time of casting, the negative pressure state in the cavity C can ensure a negative pressure state equivalent to the conventional case sealed with an O-ring, and can prevent the occurrence of defects such as a casting hole defect to a minimum.

なお、７００℃程度の溶湯を供給し、粉体からなるシール材の状態を調べる鋳造実験を行ったところ、シール材の品質が劣化することもなく、欠損も生じにくく、長期にわたって十分なシール状態を実現できることが判明した。   In addition, when a casting experiment was conducted to check the state of the sealing material made of powder by supplying a molten metal at about 700 ° C., the quality of the sealing material was not deteriorated, and it was difficult for defects to occur. It was found that can be realized.

本発明は、上述した実施形態に限定されるものではなく、特許請求の範囲内で種々改変することができる。例えば、前記実施形態では、スライドピン１６やスライドコア１９の周辺に収容部Ｓを形成したものであるが、これのみでなく、図６（Ａ）（Ｂ）に示すように、可動嵌込型１２の合わせ面１２ａに形成された、周縁部に沿って延びる二重の環状凹溝１２ｃを収容部Ｓとしてもよい。なお、各環状凹溝１２ｃの深さとしては、０．０５ｍｍ以上が好ましい。   The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. For example, in the above-described embodiment, the housing portion S is formed around the slide pin 16 and the slide core 19, but not only this but also a movable fitting type as shown in FIGS. 6 (A) and 6 (B). It is good also considering the double annular groove 12c formed in the 12 matching surfaces 12a extended along a peripheral part as the accommodating part S. FIG. The depth of each annular groove 12c is preferably 0.05 mm or more.

また、可動嵌込型１２の合わせ面１２ａだけでなく、固定嵌込型２の合わせ面２ａに収容部Ｓとしての凹溝を形成してもよい。   Further, not only the mating surface 12a of the movable fitting mold 12, but also the mating surface 2a of the fixed fitting mold 2 may be formed with a concave groove as the accommodating portion S.

さらに、本発明は、鋳造用の金型のみでなく、場合によっては射出成形用の金型などにも適用することもできる。   Furthermore, the present invention can be applied not only to casting molds but also to injection molding molds depending on circumstances.

本発明は、金型のシール構造として、耐熱性および耐久性に優れるものを提供するものであり、高い稼働率でダイカスト鋳造用金型を使用する場合に有効である。   The present invention provides a mold seal structure with excellent heat resistance and durability, and is effective when a die casting mold is used at a high operating rate.

本発明に係る実施形態の鋳造用の金型を示す断面図である。It is sectional drawing which shows the metal mold | die for casting of embodiment which concerns on this invention. 後退した可動嵌込型を示す断面図である。It is sectional drawing which shows the retractable movable fitting type | mold. （Ａ）は鋳型面から突出したスライドピンの先端部を示す側面図、（Ｂ）は可動嵌込型内に退避した状態のスライドピンを示す側面図である。(A) is a side view showing the tip of the slide pin protruding from the mold surface, (B) is a side view showing the slide pin in a state of being retracted into the movable fitting mold. （Ａ）は先端部に粉体が塗布された状態のスライドピンを示す側面図、（Ｂ）は塗布後後退したスライドピンの状態を示す側面図である。(A) is a side view showing a slide pin in a state where powder is applied to the tip, and (B) is a side view showing a state of the slide pin retracted after application. （Ａ）はスライドコアの後退した状態を示す側面図、（Ｂ）は粉体塗布後スライドコアが前進した状態を示す側面図である。(A) is a side view which shows the state which the slide core retracted, (B) is a side view which shows the state which the slide core advanced after powder application. （Ａ）は可動おも型および可動嵌込型を示す平面図、（Ｂ）は（Ａ）のＢ−Ｂ線に沿う断面図である。(A) is a top view which shows a movable main type | mold and a movable fitting type | mold, (B) is sectional drawing which follows the BB line of (A).

符号の説明Explanation of symbols

１…固定おも型、
２…固定嵌込型、
１１…可動おも型、
１２…可動嵌込型、
１２ａ…合わせ面、
１２ｂ…鋳型面、
１２ｃ…凹溝（収容部）、
１２ｄ…凹部（収容部）、
１６…スライドピン、
１６ａ…溝部（収容部）、
１９…スライドコア、
Ｐ…粉体、
Ｓ…収容部。
1 ... fixed weight,
2 ... fixed fitting type,
11 ... Moveable type,
12 ... movable fitting type,
12a ... mating surface,
12b ... mold surface,
12c ... concave groove (accommodating part),
12d ... concave portion (accommodating portion),
16 ... Slide pin,
16a ... groove part (accommodating part),
19 ... slide core,
P ... powder,
S: Accommodating section.

Claims (9)

金型のキャビティ周辺に設けられた構成部材のキャビティ近傍に、粉体を収容する収容部を形成し、当該収容部内に充填した粉体を押し固めることにより前記構成部材と金型との隙間を閉塞しシールすることを特徴とする鋳造用の金型。   Forming an accommodating portion for accommodating the powder in the vicinity of the cavity of the constituent member provided around the cavity of the mold, and pressing the powder filled in the accommodating portion to form a gap between the constituent member and the mold. A casting mold characterized in that it is closed and sealed. 前記収容部は、前記金型に摺動自在に設けられたスライドピン若しくは当該スライドピン近傍の金型に設けたことを特徴とする請求項１に記載の鋳造用の金型。   2. The casting mold according to claim 1, wherein the housing portion is provided on a slide pin that is slidably provided on the mold or a mold in the vicinity of the slide pin. 前記収容部は、前記金型に摺動自在に設けられたスライドコア若しくは当該スライドコア近傍の金型に設けたことを特徴とする請求項１に記載の鋳造用の金型。   2. The casting mold according to claim 1, wherein the housing portion is provided in a slide core slidably provided on the mold or a mold in the vicinity of the slide core. 前記収容部は、嵌込型のうちの少なくも一方の合わせ面に設けた凹溝であることを特徴とする請求項１に記載の鋳造用の金型。   The casting mold according to claim 1, wherein the housing portion is a concave groove provided on at least one mating surface of the fitting mold. 前記粉体は、珪酸塩が混合されていることを特徴とする請求項１〜４のいずれかに記載の鋳造用の金型。   The mold for casting according to any one of claims 1 to 4, wherein the powder is mixed with silicate. 鋳造用金型のキャビティ周辺に設けられた構成部材に対して、その構成部材のキャビティ近傍に形成され、粉体を収容する収容部に向けて粉体を塗布する塗布工程と、当該粉体を固化する固化工程と、を有する鋳造用の金型のシール方法。   An application step of applying powder toward a housing part that is formed near the cavity of the component member and is provided near the cavity of the casting mold, and the powder A casting mold sealing method comprising: a solidifying step for solidifying; 前記塗布工程と固化工程は、交互に繰り返し行う請求項６に記載の鋳造用の金型のシール方法。   7. The casting mold sealing method according to claim 6, wherein the coating step and the solidifying step are alternately repeated. 前記固化工程は、前記構成部材を移動変位することにより前記粉体を固化させることを特徴とする請求項６または７に記載の鋳造用の金型のシール方法。   The said solidification process solidifies the said powder by moving and displacing the said structural member, The sealing method of the metal mold | die for casting of Claim 6 or 7 characterized by the above-mentioned. 前記粉体は、珪酸塩が混合されていることを特徴とする請求項６〜８のいずれかに記載の鋳造用の金型のシール方法。   The method for sealing a casting mold according to any one of claims 6 to 8, wherein the powder is mixed with silicate.
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