JP3659390B2

JP3659390B2 - Mold making method and apparatus

Info

Publication number: JP3659390B2
Application number: JP26325598A
Authority: JP
Inventors: 鵜崎永人; 笠崎雅由; 松本武彦; 牧野泰育
Original assignee: Sintokogio Ltd
Current assignee: Sintokogio Ltd
Priority date: 1998-09-17
Filing date: 1998-09-17
Publication date: 2005-06-15
Anticipated expiration: 2018-09-17
Also published as: JP2000094092A

Description

【０００１】
【発明の属する技術分野】
本発明は、圧縮空気を用いて鋳物砂を模型板上に打ち付け高密度状態に堆積させて鋳型を造型する方法およびその装置に関する。
【０００２】
【従来の技術】
従来、圧縮空気を用いて鋳物砂を鋳枠内等に充填するようにした鋳型造型方法の代表例として、特公昭４４−１９５２２号で開示されるようなもの、および、特公平１−２９６１５号で開示されるようなもの、を挙げることができる。前者は、鋳枠の開口面積とほぼ同じ広さの断面積を有する筒体をスライドゲートを介して上下に仕切り、ゲートを閉じた状態でこの筒体の上部に鋳物砂を詰めた後、鋳物砂の上面に圧縮空気を吹込むとともにスライドゲートを開いて、筒体上部の鋳物砂の塊を筒体内で加速して発射し、その速度エネルギーで鋳物砂を鋳枠内に瞬時に詰めるようにしたものである。
【０００３】
また、後者は、型枠と模型板とスクイズプレートの三者で画成した空間内に鋳物砂を圧縮空気で吹込んだ後、スクイズプレートを模型板側へ移動させて鋳物砂をスクイズし固化させるようにしたものである。
【０００４】
【発明が解決しょうとする課題】
しかし、前者の鋳型造型方法では、塊状の鋳物砂は、模型板に衝突しても模型板の形状に馴染まない上に特に鋳枠のコーナー部に十分に充填されず、この結果、鋳物砂を模型板の表面に対して均一な密度に充填することができず、造型された鋳型には、硬度或いは強度のばらつきが生じるなどの問題があった。また、後者の鋳型造型方法では、鋳物砂を前記空間に対して所要の鋳型硬度が得られるように高密度状態に充填することができず、この結果、鋳物砂を均一して所要の鋳型硬度に固化させるためには、スクイズ工程が不可欠であるなどの問題があった。
【０００５】
本発明は上記の事情に鑑みて為されたもので、その目的は、スクイズ工程を行うことなく、鋳物砂を模型板上に均一にして高密度状態に堆積させて所定の鋳型を造型することができる鋳型造型方法およびその装置を提供することにある。
【０００６】
【課題を解決するための手段】
上記の目的を達成するために請求項１における鋳型造型方法は、圧縮空気を用いて鋳物砂を模型板上に打ち付け高密度状態に堆積させて鋳型を造型する方法であって、
模型板上の鋳枠の真上に、この鋳枠内に所定の鋳型を造型するのに必要な量にほぼ等しい量の鋳物砂を、前記鋳枠に対して所要の高さをおきかつ箱体内に装入して支持し、続いて、前記鋳物砂上面を圧力 0.2 〜 1.0 ＭＰａの圧縮空気により加圧して、水平面内で並べられて前記箱体に垂設され、直径６０〜１５０ｍｍで、長さ 0.5 〜 1.5 ｍである複数本の円筒体の内部を前記鋳物砂を順次圧縮空気と一緒に通過させながら下降させるとことにより、前記鋳物砂を２０ｍ／ｓ以上の速度に加速させた後前記模型板上に打ち付けて、前記模型板上に前記鋳物砂を高密度状態に堆積させることを特徴とする。
【０００７】
また、請求項２における鋳型造型装置は、圧縮空気を用いて鋳物砂を模型板上に打ち付け高密度状態に堆積させて鋳型を造型する装置であって、模型板上の鋳枠の真上にこの鋳枠に対して所要の高さをおいて配設され、前記鋳枠内に所定の鋳型を造型するのに必要な量にほぼ等しい量の鋳物砂を、収納し、かつ、鋳物砂排出用の複数個の貫通孔を底部に有する鋳物砂収納手段と、この鋳物砂収納手段内の鋳物砂の上面に圧縮空気を供給する圧縮空気供給手段と、前記鋳物砂収納手段の底部に装着され、前記複数個の貫通孔をそれぞれ開閉しかつ貫通孔の真上に位置する鋳物砂のほぼ全体の自重による力だけでは開放しない複数個の開閉手段と、
前記鋳物砂収納手段の下面における前記複数個の開閉手段の真下位置に前記貫通孔に連通可能にしてそれぞれ垂設され、圧縮空気により前記貫通孔から押し出された鋳物砂に対して圧縮空気による鋳物砂の下降速度増加効果を効率良く達成させる直径６０〜１５０ｍｍで長さ 0.5 〜 1.5 ｍの複数本の円筒体と、を備えたことを特徴とする。
【０００８】
【作用】
請求項１の発明においては、所定位置に支持された鋳物砂の上面に圧縮空気を供給すると、鋳物砂は、複数本の筒体により水平面内で所要の数に分割された状態の下に、大きな塊になることなく順次圧縮空気中に混入されながら筒体内を所要距離下降される。その結果、鋳物砂は、所要の速度に加速された後、模型板上に打ち付けられるとともに堆積されて、模型板表面に対してほぼ均一の密度にかつ上下方向に対してもほぼ均一の密度に堆積させられることとなる。
【０００９】
ここで、鋳物砂とは、生砂、自硬性砂等をいう。そして、生砂の場合には、造型された鋳型は所要の硬さ或いは強度を有する。
【００１０】
なお、本発明は、発明者が、鋳型造型装置を具体化したときの設置のための空間や、省エネルギ化を考慮して、解れた状態の鋳物砂を１本の筒体内に収納した後、その鋳物砂を、その筒体内で圧力０．２〜１．０ＭＰａの圧縮空気により押し下げ、続いて、直径６０〜１５０ｍｍ、長さ１ｍの１本の円筒体内を所定距離落下させて加速して、模型板上に打ち付けて堆積させる実験を、いろいろ条件を変えて行い、さらに、前記筒体および前記円筒体の本数を鋳枠の開口面積に対応させて増やし、これにより、所定の鋳枠内に鋳型を造型するようにした。この結果、鋳物砂をスクイズすることなく、所要の硬度或いは強度を有する鋳型を確実に造型することができることを見つけ出した。
【００１１】
そして、筒体の横断面の全面積が鋳枠の開口面積の１０〜５０％より狭いと、鋳物砂を所要の強度に堆積させることができず、またそれより広いと、エネルギを無駄に消費することになった。
【００１２】
また、鋳物砂が模型板の表面に衝突する直前の当該鋳物砂の速度は、２０ｍ／ｓ以上である必要があり、これより遅いと、所要の鋳型硬度を得ることができなかった。
【００１３】
また、鋳物砂に供給する圧縮空気の圧力は、０．２〜１．０ＭＰａであることが望ましく、０．２〜１．０ＭＰａより低いと、所要の鋳型硬度を得ることができず、またそれより高いと、エネルギを無駄に消費することになった。
【００１４】
また、模型板にベントホールを設けると、鋳物砂の堆積性をより高めることができた。
【００１５】
請求項７の発明においては、鋳物砂収納手段内の鋳物砂の上面に、圧縮空気供給手段により圧縮空気を供給すると、鋳物砂収納手段内の鋳物砂は、複数個の開閉手段をそれぞれ押し開き、続いて、大きな塊になることなく順次圧縮空気中に混入されながら筒体内を所要距離下降される。その結果、鋳物砂は、所要の速度に加速された後、模型板上に打ち付けられるとともに堆積されて、模型板表面に対してほぼ均一の密度にかつ上下方向に対してもほぼ均一の密度に堆積させられることとなる。
【００１６】
【発明の実施の形態】
本発明の一実施例について図面に基づき詳細に説明する。一部断面した正面図である図１に示すように、本発明の鋳型造型装置は、鋳枠Ｆ内に所定の鋳型を造型するのに必要な量にほぼ等しい量の鋳物砂を収納する鋳物砂収納手段１と、この鋳物砂収納手段１内の鋳物砂の上面に圧縮空気を供給する圧縮空気供給手段２と、前記鋳物砂収納手段１の底部に装着され、後述の複数個の貫通孔１０・１０をそれぞれ開閉しかつ貫通孔１０の真上に位置する鋳物砂のほぼ全体の自重による力だけでは開放しない複数個の開閉手段３・３と、前記鋳物砂収納手段１の下面における前記複数個の開閉手段３・３の真下位置に前記貫通孔１０に連通可能にしてそれぞれ垂設され、圧縮空気により前記貫通孔１０から押し出された鋳物砂に対して圧縮空気による鋳物砂の下降速度増加効果を効率良く達成させる所要長さの複数本の筒体４・４と、で構成してある。
【００１７】
そして、前記鋳物砂収納手段１は、図１に示すように、門型フレーム５の天井部に、ここから垂設された４本の特殊ボルト６・６および枠状の保持部材７を介して装着してあって、上下方向へ伸びる箱部材８と、図２に示すように箱部材８の空間を水平面内で碁盤の目状に仕切る横断面が格子状の仕切り部材９と、仕切り部材９で仕切られた区画内に前記貫通孔１０・１０を設けた底板１１と、で構成してある（図３参照）。そして、箱部材６と仕切り部材７とで画成する複数個の空間１２・１２の各横断面積は、鋳物砂の投入が容易なように、前記筒体４のそれより広く構成してある。また、前記各空間１２の下部の横断面積は、前記筒体４の横断面積に対応した広さに対応すべく下絞り状に構成してあり、しかも、この下部には、鋳物砂の流れを円滑にするための圧縮空気を噴出する複数のノズル（図示せず）が設けてある。
【００１８】
また、図１に示すように、前記箱部材８および仕切り部材９の上方には、箱部材８の上端開口部を気密に閉鎖可能な密閉箱状の蓋部材１４と、前記箱部材８内に鋳物砂を供給するサンドホッパ１５とが、前記鋳物砂収納手段１の前記箱部材８の真上位置に交互に移動可能にして配設してあり、前記蓋部材１４と前記サンドホッパ１５とは連結部材１６により連結してあり、さらに、蓋部材１４の左端には、前記門型フレーム５の天井上に設置された横向きシリンダ１７のピストンロッドの先端が接続してあって、これら蓋部材１４とサンドホッパ１５は、シリンダ１７の伸縮作動により、前記箱部材８の真上位置に交互に移動するようになっている。また、前記箱部材８の上端面にはシール部材（図示せず）が装着してある。
【００１９】
そして、前記蓋部材１４は、内部が図示しない可撓性ホースおよび電磁開閉弁を介して図示しない圧縮空気源に連通接続してあって、前記圧縮空気供給手段２をも構成しており、さらに、図１に示すように、蓋部材１４の底板には前記空間１２・１２への圧縮空気をそれぞれ貫流させる複数の貫通孔１８・１８が透設してある。また、前記サンドホッパ１５は、前記門型フレーム５の天井上に設置されたレール１９上にＶ溝付き車輪２０・２０を介して移動可能に配設してある。
【００２０】
また、前記開閉手段３・３のそれぞれは、図
３に示すように、一端部を片持ち支持状にして上下回動自在に支持された２枚の板部材２１・２１と、前記底板１１の下面に装着されこれら２枚の板部材２１・２１を支持する支持軸２２・２２と、板部材２１・２１を上向き状に付勢するコイルばね２３・２３とで構成してある。
【００２１】
また、前記複数本の筒体４・４は、図１に示すように、前記特殊ボルト６・６および支持板２４により保持してあり、しかも横断面が円形状の円筒部材２５・２５と、円筒部材２５・２５の下端に装着され横断面が円形状を成しかつ垂直面に対して５〜２０度、外側に開いた下広がり状を成すテーパー円筒部材２６・２６と、で構成してある。
【００２２】
また、前記筒体４・４の下部には、下絞り状の枠体を成す遮蔽部材２７が、前記特殊ボルト６・６および支持部材２８により支持されて装着してある。そして、遮蔽部材２７は側壁に排気用の開口３３を有している。
【００２３】
また、前記遮蔽部材２７の真下には前後方向へ伸びるローラーコンベヤ２９が前記門型フレーム５の下部に固定して配設してあり、ローラーコンベヤ２９の上方には定盤３０が前記門型フレーム５の下部に配設されたシリンダ３１により昇降可能にして配設してある。そして、前記定盤３０上には模型板３１が、また、模型板３１上には鋳枠Ｆがそれぞれ載置してある。
【００２４】
次に、このように構成した鋳型造型装置を用いて鋳型を造型する作動について説明すると、図１に示す状態から鋳枠Ｆ内に鋳型を造型するには、まず、シリンダ３１・３１を伸長作動して模型板３２および鋳枠Ｆを上昇させ、鋳枠Ｆを遮蔽部材２７の下面に当接させる。次いで、図示しないクランプ装置を作動して、鋳物砂収納手段１の箱部材８の上端面に蓋部材１４を当接させて、箱部材８の上端を気密状に閉鎖し、続いて、図示しない電磁開閉弁を所要時間（約０．２秒）開いて蓋部材１４を介して箱部材８内に圧縮空気を供給する。
【００２５】
すると、箱部材８内の鋳物砂は、仕切り部材９により、水平面において所要の数に分割された状態の下に、まず、複数個の開閉手段３・３の板部材２１・２１をコイルばね２３・２３の力に抗して下方へ回動させ、複数個の開閉手段３・３をそれぞれ押し開き、続いて、箱部材８内を所定距離押し下げられた後、圧縮空気中に順次混入されて複数本の筒体４・４内をそれぞれ所要距離下降して加速され、この結果、鋳物砂は、模型板３２上に打ち付けられて模型板３２上に高密度に堆積させられる。この場合、筒体４・４は、下部がテーパー円筒部材２６・２６で構成してあって下広がり状を成しているため、図５に示すように、鋳物砂は、広がった状態で模型板３２上に堆積することとなる。
【００２６】
こうして、鋳枠Ｆ内が鋳物砂で一杯になると、箱部材８内は空になる。また、鋳物砂と一緒に、筒体４・４の下端から排出された圧縮空気は、遮蔽部材２７の開口３３から排出されることとなる。次いで、シリンダ３０・３０を収縮作動して鋳枠Ｆ、模型板３２等を下降させ、続いて、適宜の慣用手段により、鋳枠Ｆを上昇させて離型を行う。
【００２７】
次いで、図示しないクランプ装置を逆作動して蓋部材１４の箱部材８に対するクランプ状態を解き、続いて、シリンダ１７を収縮作動して蓋部材１４を箱部材８の真上位置から移動させるとともに、サンドホッパ１５を箱部材８の真上位置に移動させてサンドホッパ１５から所要量の鋳物砂を箱部材８内に供給する。その後、シリンダ１７を伸長作動して蓋部材１４およびサンドホッパ１５を元に戻して一サイクルを終了する。
【００２８】
なお、上記の実施例では、箱部材８内に仕切り部材９を配設してその空間を水平面内で碁盤の目状に仕切っているが、模型板３２の形状によっては仕切り部材９を省略してもよい。また、上記の実施例では、筒体４・４は、円筒状を成しているが、これに限定されるものではなく、四角筒あるいは多角筒の角筒等でよい。さらに、上記の実施例では、筒体４・４は、下部がテーパー円筒部材２６・２６で下広がり状に構成してあるが、場合によっては、このテーパー円筒部材２６・２６を省略してもよい。
【００２９】
【発明の効果】
以上の説明から明らかなように本発明は、模型板上の鋳枠の真上に、この鋳枠内に所定の鋳型を造型するのに必要な量にほぼ等しい量の鋳物砂を、前記鋳枠に対して所要の高さをおきかつ箱体内に装入して支持し、続いて、前記鋳物砂上面を圧力 0.2 〜 1.0 ＭＰａの圧縮空気により加圧して、水平面内で並べられて前記箱体に垂設され、直径６０〜１５０ｍｍで、長さ 0.5 〜 1.5 ｍである複数本の円筒体の内部を前記鋳物砂を順次圧縮空気と一緒に通過させながら下降させるとことにより、
前記鋳物砂を２０ｍ／ｓ以上の速度に加速させた後前記模型板上に打ち付けて、前記模型板上に前記鋳物砂を高密度状態に堆積させるようにしたから、スクイズ工程を行うことなく、鋳物砂を模型板上に均一にして高密度状態に堆積させて所定の鋳型を確実かつ容易に造型することができるなどの優れた実用的効果を奏する。
【図面の簡単な説明】
【図１】本発明の一実施例を示す一部切り欠き断面正面図である。
【図２】図１のＡ−Ａ断面図である。
【図３】図１のＢ部拡大詳細図である。
【図４】図１のＣ−Ｃ断面図である。
【図５】鋳物砂を模型板上に打ち付けた時の図１のＤ−Ｄ矢視図である。
【符号の説明】
１鋳物砂収納手段
２圧縮空気供給手段
３開閉手段
４筒体
円筒部材
テーパー円筒部材
３２模型板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for molding a casting mold by casting sand on a model plate using compressed air and depositing it in a high density state.
[0002]
[Prior art]
Conventionally, as a typical example of a mold making method in which molding sand is filled into a casting frame or the like using compressed air, a method as disclosed in Japanese Patent Publication No. 44-19522 and Japanese Patent Publication No. 1-29615 Can be mentioned. In the former case, a cylinder having a cross-sectional area approximately the same as the opening area of the casting frame is divided into upper and lower parts via a slide gate, and after casting sand is filled in the upper part of the cylinder with the gate closed, the casting Compressed air is blown into the upper surface of the sand and the slide gate is opened, and the lump of foundry sand at the top of the cylinder is accelerated and fired in the cylinder, and the foundry sand is instantly packed into the casting frame with its velocity energy. It is a thing.
[0003]
In the latter case, after casting sand is blown with compressed air into the space defined by the mold, model plate and squeeze plate, the squeeze plate is moved to the model plate side to squeeze and solidify the foundry sand. It is made to let you.
[0004]
[Problems to be solved by the invention]
However, in the former mold making method, the lump foundry sand does not conform to the shape of the model plate even if it collides with the model plate, and in particular, the corner of the casting frame is not sufficiently filled. The mold cannot be filled with a uniform density with respect to the surface of the model board, and the molded mold has a problem such as variation in hardness or strength. Further, in the latter mold molding method, it is impossible to fill the foundry sand in a high density state so that the required mold hardness can be obtained in the space. As a result, the foundry sand can be uniformly filled with the required mold hardness. There is a problem that a squeeze process is indispensable in order to solidify.
[0005]
The present invention has been made in view of the above circumstances, and its purpose is to form a predetermined mold by uniformly casting sand on a model plate and depositing it in a high density state without performing a squeeze process. It is an object of the present invention to provide a mold making method and an apparatus therefor.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the mold making method according to claim 1 is a method of casting a casting sand on a model plate using compressed air and depositing it in a high density state to form a mold,
Just above the casting frame on the model plate, an amount of foundry sand approximately equal to the amount required to form a predetermined mold in the casting frame is placed at a required height with respect to the casting frame. It is inserted into the body and supported, and then the upper surface of the molding sand is pressurized with compressed air having a pressure of 0.2 to 1.0 MPa , arranged in a horizontal plane and suspended from the box, and has a diameter of 60 to 150 mm. After accelerating the foundry sand to a speed of 20 m / s or more by lowering the inside of a plurality of cylindrical bodies having a length of 0.5 to 1.5 m while sequentially passing the foundry sand together with the compressed air. It is hit | damaged on the said model board, The said foundry sand is deposited on the said model board in a high-density state, It is characterized by the above-mentioned.
[0007]
Further, the mold making apparatus according to claim 2 is an apparatus for molding a casting mold by casting sand on a model board using compressed air and depositing it in a high density state, and directly above the casting frame on the model board. An amount of foundry sand that is disposed at a required height with respect to the casting frame and that is approximately equal to the amount required to mold a predetermined mold is stored in the casting frame, and the foundry sand is discharged. A casting sand storage means having a plurality of through holes at the bottom, a compressed air supply means for supplying compressed air to the upper surface of the casting sand in the casting sand storage means, and a bottom of the foundry sand storage means. A plurality of opening / closing means that open and close each of the plurality of through holes and that do not open only by the force of almost the entire weight of the foundry sand positioned directly above the through holes;
A casting made of compressed air with respect to the foundry sand that is suspended from the through-holes so as to be communicated with the through-holes at a position directly below the plurality of opening / closing means on the lower surface of the foundry sand storage means. And a plurality of cylindrical bodies having a diameter of 60 to 150 mm and a length of 0.5 to 1.5 m , which efficiently achieve the effect of increasing the sand falling speed.
[0008]
[Action]
In the invention of claim 1, when compressed air is supplied to the upper surface of the foundry sand supported at a predetermined position, the foundry sand is divided into a required number in a horizontal plane by a plurality of cylindrical bodies, The cylinder is lowered by a required distance while being sequentially mixed into the compressed air without becoming a large lump. As a result, the foundry sand is accelerated to the required speed, and then is struck and deposited on the model plate to obtain a substantially uniform density on the model plate surface and a substantially uniform density in the vertical direction. It will be deposited.
[0009]
Here, the foundry sand refers to fresh sand, self-hardening sand and the like. In the case of fresh sand, the molded mold has a required hardness or strength.
[0010]
In the present invention, after the inventor stores the foundry sand in a single cylinder in consideration of space for installation when the mold making apparatus is embodied and energy saving. The casting sand is pushed down by compressed air having a pressure of 0.2 to 1.0 MPa in the cylindrical body, and then is accelerated by dropping a predetermined distance within one cylindrical body having a diameter of 60 to 150 mm and a length of 1 m. The experiment was conducted by depositing on the model plate under various conditions, and the number of the cylinders and the cylinders was increased corresponding to the opening area of the casting frame, thereby The mold was made in the above. As a result, it has been found that a mold having a required hardness or strength can be reliably formed without squeezing the foundry sand.
[0011]
If the total cross-sectional area of the cylinder is smaller than 10 to 50% of the opening area of the casting frame, the casting sand cannot be deposited at a required strength. If it is wider than that, energy is wasted. Decided to do.
[0012]
Further, the speed of the foundry sand immediately before the foundry sand collides with the surface of the model plate needs to be 20 m / s or more. If it is slower than this, the required mold hardness cannot be obtained.
[0013]
Further, the pressure of the compressed air supplied to the foundry sand is desirably 0.2 to 1.0 MPa, and if it is lower than 0.2 to 1.0 MPa, the required mold hardness cannot be obtained. If it was higher, energy wasted.
[0014]
Moreover, when the vent hole was provided in the model board, the sedimentation property of the foundry sand could be further improved.
[0015]
In the invention of claim 7, when compressed air is supplied to the upper surface of the foundry sand in the foundry sand storage means by the compressed air supply means, the foundry sand in the foundry sand storage means pushes and opens each of the plurality of opening / closing means. Subsequently, the cylinder is lowered by a required distance while being sequentially mixed into the compressed air without becoming a large lump. As a result, the foundry sand is accelerated to the required speed, and then is struck and deposited on the model plate to obtain a substantially uniform density on the model plate surface and a substantially uniform density in the vertical direction. It will be deposited.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, which is a partially sectional front view, the mold making apparatus of the present invention is a casting that contains casting sand in an amount approximately equal to the amount required to mold a predetermined mold in a casting frame F. Sand storage means 1, compressed air supply means 2 for supplying compressed air to the upper surface of the foundry sand in the foundry sand storage means 1, and a plurality of through holes to be described later, mounted on the bottom of the foundry sand storage means 1 A plurality of opening and closing means 3 and 3 that open and close each of them and that cannot be opened only by the force of almost the entire weight of the foundry sand positioned directly above the through-hole 10, and the lower surface of the foundry sand storage means 1 The descending speed of the foundry sand by the compressed air with respect to the foundry sand that is suspended from the through hole 10 by the compressed air and communicates with the through hole 10 at a position directly below the plurality of opening / closing means 3. Required to efficiently achieve the increase effect A plurality of tubular bodies 4, 4 are, in are constituted.
[0017]
As shown in FIG. 1, the foundry sand storage means 1 is connected to the ceiling of the portal frame 5 via four special bolts 6 and 6 and a frame-shaped holding member 7 suspended from the ceiling. A box member 8 that is mounted and extends in the vertical direction, and a partition member 9 having a grid-like cross section that partitions the space of the box member 8 in a horizontal plane as shown in FIG. And a bottom plate 11 provided with the through-holes 10 and 10 in a section partitioned by (see FIG. 3). Each cross-sectional area of the plurality of spaces 12 and 12 defined by the box member 6 and the partition member 7 is configured wider than that of the cylindrical body 4 so that casting sand can be easily input. In addition, the cross-sectional area of the lower portion of each space 12 is configured as a lower drawing shape so as to correspond to the width corresponding to the cross-sectional area of the cylindrical body 4. A plurality of nozzles (not shown) for ejecting compressed air for smoothness are provided.
[0018]
Further, as shown in FIG. 1, above the box member 8 and the partition member 9, a sealed box-like lid member 14 capable of airtightly closing the upper end opening of the box member 8, and the box member 8 are provided. Sand hoppers 15 for supplying foundry sand are arranged so as to be alternately movable to positions directly above the box members 8 of the foundry sand storage means 1, and the lid member 14 and the sand hopper 15 are connected members. 16, and the tip of a piston rod of a lateral cylinder 17 installed on the ceiling of the portal frame 5 is connected to the left end of the lid member 14, and these lid member 14 and sand hopper are connected to each other. 15 is alternately moved to a position directly above the box member 8 by the expansion and contraction operation of the cylinder 17. Further, a seal member (not shown) is attached to the upper end surface of the box member 8.
[0019]
The lid member 14 is connected in communication with a compressed air source (not shown) through a flexible hose (not shown) and an electromagnetic on-off valve, and also constitutes the compressed air supply means 2. As shown in FIG. 1, the bottom plate of the lid member 14 is provided with a plurality of through holes 18 and 18 through which compressed air to the spaces 12 and 12 flows. The sand hopper 15 is movably disposed on a rail 19 installed on the ceiling of the portal frame 5 via V-grooved wheels 20 and 20.
[0020]
Further, as shown in FIG. 3, each of the opening / closing means 3 and 3 includes two plate members 21 and 21 supported at one end in a cantilevered manner so as to be pivotable up and down, and the bottom plate 11. The support shafts 22 and 22 that are mounted on the lower surface and support the two plate members 21 and 21 and the coil springs 23 and 23 that urge the plate members 21 and 21 upward are configured.
[0021]
Further, as shown in FIG. 1, the plurality of cylindrical bodies 4 and 4 are held by the special bolts 6 and 6 and the support plate 24, and the cylindrical members 25 and 25 having a circular cross section, Tapered cylindrical members 26 and 26 which are attached to the lower ends of the cylindrical members 25 and 25 and have a circular cross section and 5 to 20 degrees with respect to a vertical plane and a downwardly expanding shape opened outward. is there.
[0022]
Further, a shielding member 27 forming a lower drawing frame is supported and attached to the lower part of the cylindrical bodies 4 and 4 by the special bolts 6 and 6 and the support member 28. The shielding member 27 has an exhaust opening 33 on the side wall.
[0023]
In addition, a roller conveyor 29 extending in the front-rear direction is disposed directly below the shielding member 27 so as to be fixed to a lower portion of the portal frame 5, and a surface plate 30 is disposed above the roller conveyor 29. 5 can be moved up and down by a cylinder 31 disposed at a lower portion of the cylinder 5. A model plate 31 is placed on the surface plate 30, and a casting frame F is placed on the model plate 31.
[0024]
Next, the operation of molding a mold using the mold molding apparatus constructed as described above will be described. To mold a mold in the casting frame F from the state shown in FIG. Then, the model plate 32 and the casting frame F are raised, and the casting frame F is brought into contact with the lower surface of the shielding member 27. Next, a clamping device (not shown) is operated to bring the lid member 14 into contact with the upper end surface of the box member 8 of the foundry sand storage means 1 to close the upper end of the box member 8 in an airtight manner. The electromagnetic on-off valve is opened for a required time (about 0.2 seconds), and compressed air is supplied into the box member 8 through the lid member 14.
[0025]
Then, the foundry sand in the box member 8 is divided into a required number in the horizontal plane by the partition member 9, and the plate members 21, 21 of the plurality of opening / closing means 3, 3 are first moved to the coil spring 23. Rotate downward against the force of 23 to push open the plurality of open / close means 3 and 3 respectively, and then push down the inside of the box member 8 for a predetermined distance before being sequentially mixed into the compressed air The plurality of cylinders 4 and 4 are accelerated by lowering the required distance, respectively. As a result, the foundry sand is struck onto the model plate 32 and deposited on the model plate 32 with high density. In this case, since the cylindrical bodies 4 and 4 are formed with tapered cylindrical members 26 and 26 at the lower part and have a downwardly expanding shape, as shown in FIG. It will be deposited on the plate 32.
[0026]
Thus, when the inside of the casting frame F is filled with foundry sand, the inside of the box member 8 becomes empty. In addition, the compressed air discharged from the lower ends of the cylinders 4 and 4 together with the foundry sand is discharged from the opening 33 of the shielding member 27. Next, the cylinders 30 and 30 are contracted to lower the casting frame F, the model plate 32, and the like, and then the casting frame F is raised and released by an appropriate conventional means.
[0027]
Next, the clamping device (not shown) is reversely operated to release the clamping state of the lid member 14 with respect to the box member 8. Subsequently, the cylinder 17 is contracted to move the lid member 14 from a position directly above the box member 8. The sand hopper 15 is moved to a position directly above the box member 8, and a required amount of foundry sand is supplied from the sand hopper 15 into the box member 8. Thereafter, the cylinder 17 is extended and the lid member 14 and the sand hopper 15 are returned to their original positions to complete one cycle.
[0028]
In the above embodiment, the partition member 9 is disposed in the box member 8 and the space is partitioned into a grid pattern in a horizontal plane. However, depending on the shape of the model plate 32, the partition member 9 may be omitted. May be. In the above-described embodiment, the cylinders 4 and 4 have a cylindrical shape, but are not limited thereto, and may be a square cylinder or a polygonal cylinder. Furthermore, in the above-described embodiment, the cylindrical bodies 4 and 4 are configured such that the lower part is formed by the tapered cylindrical members 26 and 26 so as to expand downward. Good.
[0029]
【The invention's effect】
As is apparent from the above description, the present invention provides a casting sand of an amount substantially equal to the amount necessary for forming a predetermined mold in the casting frame directly above the casting frame on the model plate. frame relative to the support was charged to and box body placed the required height, then, the casting sand surface pressurized by the pressure 0.2 ~ 1.0 MPa of compressed air, the box are arranged in a horizontal plane By dropping the inside of a plurality of cylindrical bodies having a diameter of 60 to 150 mm and a length of 0.5 to 1.5 m while passing the foundry sand together with compressed air,
After accelerating the casting sand to a speed of 20 m / s or more and hitting it on the model plate, the casting sand is deposited in a high density state on the model plate, without performing a squeeze step, It has excellent practical effects such as uniform casting sand on a model plate and depositing it in a high density state to make a predetermined mold reliably and easily.
[Brief description of the drawings]
FIG. 1 is a partially cutaway sectional front view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is an enlarged detail view of a part B in FIG. 1;
4 is a cross-sectional view taken along the line CC of FIG.
5 is a DD arrow view of FIG. 1 when casting sand is struck on a model board. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Found sand storage means 2 Compressed air supply means 3 Opening / closing means 4 Cylindrical cylindrical member taper cylindrical member 32 Model board

Claims

圧縮空気を用いて鋳物砂を模型板上に打ち付け高密度状態に堆積させて鋳型を造型する方法であって、
模型板上の鋳枠の真上に、
この鋳枠内に所定の鋳型を造型するのに必要な量にほぼ等しい量の鋳物砂を、前記鋳枠に対して所要の高さをおきかつ箱体内に装入して支持し、続いて、
前記鋳物砂上面を圧力 0.2 〜 1.0 ＭＰａの圧縮空気により加圧して、
水平面内で並べられて前記箱体に垂設された直径６０〜１５０ｍｍで、長さ 0.5 〜 1.5 ｍである複数本の円筒体の内部を前記鋳物砂を順次圧縮空気と一緒に通過させながら下降させるとことにより、
前記鋳物砂を２０ｍ／ｓ以上の速度に加速させた後前記模型板上に打ち付けて、
前記模型板上に前記鋳物砂を高密度状態に堆積させることを特徴とする鋳型造型方法。It is a method of casting mold sand on a model board using compressed air and depositing it in a high density state to mold a mold,
Just above the casting frame on the model plate,
An amount of foundry sand approximately equal to the amount required to mold a predetermined mold in the casting frame is placed at a required height with respect to the casting frame and loaded into the box to support it. ,
The upper surface of the casting sand is pressurized with compressed air having a pressure of 0.2 to 1.0 MPa ,
Descending while sequentially passing the foundry sand together with compressed air through a plurality of cylindrical bodies having a diameter of 60 to 150 mm and a length of 0.5 to 1.5 m arranged in a horizontal plane and suspended from the box. By letting
After accelerating the foundry sand to a speed of 20 m / s or more, it is struck on the model plate,
A mold making method, wherein the casting sand is deposited in a high density state on the model plate.

圧縮空気を用いて鋳物砂を模型板上に打ち付け高密度状態に堆積させて鋳型を造型する装置であって、
模型板上の鋳枠の真上にこの鋳枠に対して所要の高さをおいて配設され、前記鋳枠内に所定の鋳型を造型するのに必要な量にほぼ等しい量の鋳物砂を、収納し、かつ、鋳物砂排出用の複数個の貫通孔を底部に有する鋳物砂収納手段と、
この鋳物砂収納手段内の鋳物砂の上面に圧縮空気を供給する圧縮空気供給手段と、
前記鋳物砂収納手段の底部に装着され、前記複数個の貫通孔をそれぞれ開閉しかつ貫通孔の真上に位置する鋳物砂のほぼ全体の自重による力だけでは開放しない複数個の開閉手段と、
前記鋳物砂収納手段の下面における前記複数個の開閉手段の真下位置に前記貫通孔に連通可能にしてそれぞれ垂設され、圧縮空気により前記貫通孔から押し出された鋳物砂に対して圧縮空気による鋳物砂の下降速度増加効果を効率良く達成させる直径６０〜１５０ｍｍで長さ 0.5 〜 1.5 ｍの複数本の円筒体と、
を備えたことを特徴とする鋳型造型装置。An apparatus for molding a casting mold by casting sand on a model board using compressed air and depositing it in a high density state,
An amount of foundry sand that is disposed directly above the cast frame on the model plate at a required height with respect to the cast frame and is approximately equal to the amount required to mold a predetermined mold in the cast frame. Casting sand storage means having a plurality of through-holes for discharging the molding sand at the bottom,
Compressed air supply means for supplying compressed air to the upper surface of the foundry sand in the foundry sand storage means;
A plurality of opening / closing means attached to the bottom of the foundry sand storage means, each opening and closing the plurality of through holes, and not opening only by the force of almost the entire weight of the foundry sand located directly above the through holes;
A casting made of compressed air with respect to the foundry sand that is suspended from the through-holes so as to be communicated with the through-holes at a position directly below the plurality of opening / closing means on the lower surface of the foundry sand storage means. A plurality of cylinders having a diameter of 60 to 150 mm and a length of 0.5 to 1.5 m , which efficiently achieve the effect of increasing the sand descending speed;
A mold making apparatus characterized by comprising: