JP3581822B2

JP3581822B2 - Mold molding method and apparatus therefor

Info

Publication number: JP3581822B2
Application number: JP2000214100A
Authority: JP
Inventors: 諭三金平
Original assignee: Metal Engineering KK
Current assignee: Metal Engineering KK
Priority date: 2000-07-14
Filing date: 2000-07-14
Publication date: 2004-10-27
Anticipated expiration: 2020-07-14
Also published as: JP2002028753A

Description

【０００１】
【発明の属する技術分野】
本発明は、鋳型の造型方法及びその方法を実施するための鋳型造型装置に関するものである。
【０００２】
【従来の技術】
例えば、特開昭５６−１２４５号公報に記載された鋳型造型装置においては、シリンダ装置によるスクイズテーブルの上昇につれて、外周に下盛枠を昇降可能に嵌合した模型をスクイズテーブル上面に模型交換位置で受取り、鋳枠を前進位置に位置した下盛枠の上面に鋳枠受渡位置で受取り、上盛枠を鋳枠上面に当接させ、これら重ね合わせられた下盛枠と鋳枠と上盛枠内に鋳物砂を供給し、鋳物砂の供給後にスクイズヘッドに設けたシリンダ装置により上盛枠の上昇を規制した状態で前記スクイズテーブルを前記下盛枠の鋳枠との当接面が後退位置に後退するまで上昇させて鋳物砂を模型面側スクイズし、該模型面側スクイズの終了後に前記シリンダ装置による上盛枠の上昇規制を解除して前記スクイズテーブルを上昇させて鋳物砂を背面側スクイズし、背面側スクイズ終了後、前記スクイズテーブルを下降させ、前記鋳枠を下降途中において前記鋳枠受渡位置でローラコンベア上に載置して模型を鋳型から離型している。
【０００３】
【発明が解決しようとする課題】
上記従来の鋳型造型装置では、鋳枠をローラコンベア上に載置してから模型をさらに下降させて離型するので、ローラコンベア又は鋳枠が摩耗した場合、離型時の鋳枠の水平を維持することができなくなり、鋳型に角かけ、又は突起部の縁切れが発生し、係る鋳型で鋳造した鋳物は、バリが発生したり、不良品となる不具合があった。
【０００４】
【課題を解決するための手段】
上記の課題を解決するため、請求項１に記載の発明の構成上の特徴は、スクイズテーブルとスクイズヘッドを造型経路に沿って互いに対向して相対的に進退可能に設け、模型が取付けられた模型定盤を囲んで前記経路方向に進退可能に前記スクイズテーブル上に設けられた下盛枠を鋳枠当接面が模型定盤の盤面より模型側に位置する前進位置に前進させ、前記スクイズテーブルの前進につれて、鋳枠を鋳枠受渡位置で前記下盛枠の鋳枠当接面上に、上盛枠を鋳枠上に順次重合させ、該重合された下盛枠と鋳枠と上盛枠内に鋳物砂を供給し、鋳物砂の供給後に前記スクイズテーブル又はスクイズヘッドを互いに接近させて鋳物砂をスクイズして鋳型を造型し、スクイズ終了後、前記スクイズテーブルを後退させて前記鋳枠を前記鋳枠受渡位置に戻す前に、前記下盛枠を前進させて前記模型を鋳型から離型させることである。
【０００５】
請求項２に係る発明の構成上の特徴は、駆動装置により造型経路に沿って互いに対向して相対的に進退移動されるスクイズテーブルとスクイズヘッドとを装置本体に設け、前記スクイズテーブルとの間で鋳枠を受け渡しする鋳枠受渡装置を前記造型経路内に設け、上盛枠を該鋳枠受渡装置と前記スクイズヘッドとの間で造型経路に沿って移動可能に設け、下盛枠を模型が取付けられた模型定盤を囲んで前記経路方向に進退可能にスクイズテーブル上に設け、前記下盛枠を鋳枠当接面が前記模型定盤の盤面と一致する後退位置と前記盤面より模型側に位置する前進位置との間で進退させる下盛枠進退装置を設け、前記駆動装置によるスクイズテーブルの前進により重合された前進位置に位置する下盛枠と鋳枠と上盛枠内に鋳物砂を供給する装置を設け、鋳物砂の供給後に前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂をスクイズして鋳型を造型し、スクイズを終了した後、前記スクイズテーブルを前記駆動装置により後退させて前記鋳枠を前記鋳枠供給装置に受け渡す前に、前記下盛枠を下盛枠進退装置により前進させて前記模型を鋳型から離型させることである。
【０００６】
請求項３に係る発明の構成上の特徴は、駆動装置により造型経路に沿って互いに対向して相対的に進退移動されるスクイズテーブルとスクイズヘッドとを装置本体に設け、前記スクイズテーブルとの間で鋳枠を受け渡しする鋳枠受渡装置を前記造型経路内に設け、上盛枠を該鋳枠受渡装置と前記スクイズヘッドとの間で造型経路に沿って移動可能に設け、下盛枠を模型が取付けられた模型定盤を囲んで前記経路方向に進退可能にスクイズテーブル上に設け、前記下盛枠を鋳枠当接面が前記模型定盤の盤面と一致する後退位置と前記盤面より模型側に位置する前進位置との間で進退させる下盛枠進退装置を設け、前記駆動装置によるスクイズテーブルの前進により重合された前進位置に位置する下盛枠と鋳枠と上盛枠内に鋳物砂を供給する装置を設け、鋳物砂の供給後に前記スクイズヘッドと前記上盛枠との造型経路方向の相対移動を許容した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂を背面側予備スクイズし、前記スクイズヘッドと前記上盛枠との経路方向の相対移動を規制した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により前記下盛枠が後退位置に後退するまで互いに接近させて鋳物砂を模型面側スクイズし、該模型面側スクイズの終了後に前記スクイズヘッドと前記上盛枠との造型経路方向の相対移動を許容した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂を背面側スクイズし、該背面側スクイズを終了した後、前記スクイズテーブルを前記駆動装置により後退させて前記鋳枠を前記鋳枠供給装置に受け渡す前に、前記下盛枠を下盛枠進退装置により前進させて前記模型を鋳型から離型させることである。
【０００７】
請求項４に係る発明の構成上の特徴は、駆動装置により造型経路に沿って上下方向に相対的に進退移動されるスクイズテーブルとスクイズヘッドと、前記スクイズテーブル上に着脱可能に載置されるマスタプレートを係脱自在に保持するマスタプレート交換装置と、前記スクイズテーブルに載置されたマスタプレートとの間で鋳枠を受け渡しする鋳枠受渡装置と、上下方向に移動可能に装架されて鋳枠上面と係脱する上盛枠とを装置本体に設け、下盛枠を模型が取付けられた模型定盤を囲んで上下方向に進退可能に前記マスタプレートに設け、前記下盛枠を鋳枠当接面が前記模型定盤の盤面と一致する後退位置と前記盤面より模型側に位置する前進位置との間で進退させる下盛枠進退装置を設け、前記スクイズテーブル上に載置された前記マスタプレートの下盛枠を前記下盛枠進退装置により前進位置に位置させ、前記駆動装置による前記スクイズテーブルの上昇により重合された前進位置に位置した下盛枠と鋳枠と上盛枠に鋳物砂を供給する装置を設け、鋳物砂の供給後に前記スクイズヘッドと前記上盛枠との上下方向の相対移動を許容した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂を背面側予備スクイズし、前記スクイズヘッドと前記上盛枠との上下方向の相対移動を規制した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により前記下盛枠が下降位置に下降するまで互いに接近させて鋳物砂を模型面側スクイズし、該模型面側スクイズの終了後に前記スクイズヘッドと前記上盛枠との上下方向の相対移動を許容した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂を背面側スクイズし、該背面側スクイズを終了した後、前記スクイズテーブルを前記駆動装置により下降させて前記鋳枠を前記鋳枠供給装置に受け渡す前に、前記下盛枠を下盛枠進退装置により上昇させて前記模型を鋳型から離型させることである。
【０００８】
請求項５に係る発明の構成上の特徴は、請求項４に記載の鋳型造型装置において、有底穴部を前記下盛枠に下向きに設け、該有底穴部に嵌合する棒状の係止部材を前記マスタプレートに設け、有底穴部の底部が前記係止部材の頭部に当接することにより前記下盛枠を鋳型当接面が前記模型定盤の盤面と一致する後退位置に位置決めすることである。
【０００９】
請求項６に係る発明の構成上の特徴は、請求項３乃至請求項５のいずれかに記載の鋳型造型装置において、前記スクイズヘッドをヘッド本体に設けたシリンダに造型経路方向に摺動可能に嵌合したピストンのピストンロッド先端に加圧ヘッドを設けて構成し、該シリンダの前記ピストンロッドと反対側の室に該室内の圧力が設定値以上になると圧油を排出する圧力制御弁を設け、鋳物砂を模型面側スクイズするとき前記室をブロックし、該室内の圧力が設定値以上になると前記圧力制御弁が作動して前記加圧ヘッドを前記下盛枠が後退位置又は下降位置に後退するまで後退させることである。
【００１０】
請求項７に係る発明の構成上の特徴は、請求項２乃至請求項６のいずれかに記載の鋳型造型装置において、前記下盛枠進退装置を複数個のシリンダ装置で構成し、該複数個のシリンダ装置への圧油の給排を同調シリンダで同調制御することである。
【００１１】
請求項８に係る発明の構成上の特徴は、請求項２乃至請求項６のいずれかに記載の鋳型造型装置において、前記下盛枠進退装置を前記スクイズテーブルの下方に一体的に設けられた環状ピストンと該環状ピストンに嵌合する環状シリンダとで構成したことである。
【００１２】
請求項９に係る発明の構成上の特徴は、請求項２乃至請求項８のいずれかに記載の鋳型造型装置において、模型定盤外周と下盛枠内周との間に介在するスペーサを前記マスタプレートに固定したことである。
【００１３】
請求項１０に係る発明の構成上の特徴は、請求項９に記載の鋳型造型装置において、前記スペーサの外周面と嵌合する内周面及び前記下盛枠が後退位置に位置したときに前記模型定盤の盤面と一致する前記鋳枠当接面が形成されたライナを前記下盛枠の内周に固定したことである。
【００１４】
【発明の作用・効果】
上記のように構成した請求項１に係る発明においては、スクイズヘッドと対向するスクイズテーブルの前進につれて、鋳枠を前進端に位置する下盛枠の鋳枠当接面上に、上盛枠を鋳枠上に順次重合し、該重合された下盛枠と鋳枠と上盛枠内に鋳物砂を供給し、前記スクイズテーブル又はスクイズヘッドを互いに接近させて鋳物砂をスクイズして鋳型を造型し、スクイズ終了後、前記スクイズテーブルを後退させて前記鋳枠を鋳枠受渡位置に戻す前に、前記下盛枠を前進させて前記模型を鋳型から離型させるようにしたので、鋳枠を水平に維持した状態で模型を鋳型から離型することができ、鋳型に角かけ、又は突起部の縁切れが発生することを防止して鋳型を造型することができる。
【００１５】
上記のように構成した請求項２に係る発明においては、スクイズヘッドと対向するスクイズテーブルを駆動装置により前進させて、鋳枠を前進端に位置する下盛枠の鋳枠当接面上に、上盛枠を鋳枠上に順次重合し、該重合された下盛枠と鋳枠と上盛枠内に鋳物砂を供給し、鋳物砂の供給後に前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂をスクイズして鋳型を造型し、スクイズを終了した後、前記スクイズテーブルを前記駆動装置により後退させて前記鋳枠を鋳枠供給装置に受け渡す前に、前記下盛枠を下盛枠進退装置により前進させて前記模型を鋳型から離型させるようにしたので、鋳枠を水平に維持した状態で模型を鋳型から離型することができ、造型した鋳型に角かけ、又は突起部の縁切れが発生することのない鋳型造型装置を提供することができる。
【００１６】
上記のように構成した請求項３に係る発明においては、スクイズヘッドと対向するスクイズテーブルを駆動装置により前進させて、鋳枠を前進端に位置する下盛枠の鋳枠当接面上に、上盛枠を鋳枠上に順次重合し、該重合された下盛枠と鋳枠と上盛枠内に鋳物砂を供給し、鋳物砂の供給後にスクイズヘッドと上盛枠との造型経路方向の相対移動を許容した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂を背面側予備スクイズし、スクイズヘッドと上盛枠との造型経路方向の相対移動を規制した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により前記下盛枠が後退位置に後退するまで互いに接近させて鋳物砂を模型面側スクイズし、該模型面側スクイズの終了後にスクイズヘッドと上盛枠との造型経路方向の相対移動を許容した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂を背面側スクイズし、該背面側スクイズを終了した後、前記スクイズテーブルを前記駆動装置により後退させて前記鋳枠を鋳枠供給装置に受け渡す前に、前記下盛枠を下盛枠進退装置により前進させて前記模型を鋳型から離型させるようにしたので、強度の均一な鋳型が造型可能であるとともに、鋳枠を水平に維持した状態で模型を鋳型から離型することができ、造型した鋳型に角かけ、又は突起部の縁切れが発生することのない鋳型造型装置を提供することができる。
【００１７】
上記のように構成した請求項４に係る発明においては、駆動装置によりスクイズテーブルを上昇させて、外周に下盛枠を昇降可能に嵌合したマスタプレートを模型交換装置から受け取ってスクイズテーブル上に載置し、鋳枠を下盛枠進退装置により前進位置に位置された下盛枠上面に鋳枠受渡装置から受け取り、上盛枠を鋳枠上面に係合させ、該重合された下盛枠と鋳枠と上盛枠内に鋳物砂を供給し、鋳物砂の供給後にスクイズヘッドと上盛枠との上下方向の相対移動を許容した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂を背面側予備スクイズし、スクイズヘッドと上盛枠との上下方向の相対移動を規制した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により前記下盛枠が後退位置に後退するまで互いに接近させて鋳物砂を模型面側スクイズし、該模型面側スクイズの終了後にスクイズヘッドと上盛枠との上下方向の相対移動を許容した状態で前記スクイズテーブル又はスクイズヘッドを前記駆動装置により互いに接近させて鋳物砂を背面側スクイズし、該背面側スクイズを終了した後、前記スクイズテーブルを前記駆動装置により下降させて前記鋳枠を鋳枠供給装置に受け渡す前に、前記下盛枠を下盛枠進退装置により前進させて前記模型を鋳型から離型させるようにしたので、模型を取付けたマスタプレートに下盛枠を進退させるためのシリンダ装置及びその配管を設けることなく、模型の交換に応じてマスタプレートを簡単に交換することができるとともに、鋳枠を水平に維持した状態で模型を鋳型から離型することができ、鋳型に角かけ、又は突起部の縁切れが発生することのない鋳型造型装置を提供することができる。
【００１８】
上記のように構成した請求項５に係る発明においては、請求項４に記載の鋳型造型装置において、下盛枠に下向きに設けられた有底穴部の底部が、マスタプレートに設けられて前記有底穴部に嵌合する棒状の係止部材の頭部に当接することにより前記下盛枠を後退位置に位置決めするので、係止部材の頭部に鋳物砂や粉塵が付着することを防ぐことができ、後退位置における下盛枠延いては鋳枠の良好な水平度を確保して不良鋳型の造型を防止することができる。
【００１９】
上記のように構成した請求項６に係る発明においては、鋳物砂を模型面側スクイズするとき、加圧ヘッドに連結されたピストンを嵌合したシリンダの圧力が設定値以上になると、圧力制御弁が作動して加圧ヘッドが後退してスクイズテーブルの相対的な上昇を許容し、下盛枠がスクイズテーブルに対して後退位置まで後退されるので、鋳物砂のコンパクタビリティが低い場合にも下盛枠の鋳枠当接面を模型定盤の盤面と確実に一致させることができる。
【００２０】
上記のように構成した請求項７に係る発明においては、請求項２乃至請求項６のいずれかに記載の鋳型造型装置において、下盛枠を進退させる複数個のシリンダ装置への圧油の給排を同調シリンダで同調制御するようにしたので、下盛枠を高い精度で平行移動させることができ、模型の鋳型からの離型性がきわめて良好となる。
【００２１】
上記のように構成した請求項８に係る発明においては、請求項２乃至請求項６のいずれかに記載の鋳型造型装置において、スクイズテーブルの下方に一体的に設けた環状ピストンに嵌合する環状シリンダにより下盛枠を進退させるので、下盛枠を高い精度で平行移動させて模型を鋳型から良好に離型することができる。
【００２２】
上記のように構成した請求項９に係る発明においては、請求項２乃至請求項８のいずれかに記載の鋳型造型装置において、模型定盤外周と下盛枠内周との間にスペーサを介在させたので、下盛り枠の進退移動によって模型定盤外周が摩耗することを防止することができ、スペーサ外周面が摩耗した場合、安価なスペーサを取替えることで容易に対処することができる。
【００２３】
上記のように構成した請求項１０に係る発明においては、請求項９に記載の鋳型造型装置において、前記スペーサの外周面と嵌合する内周面及び下盛枠が後退位置に位置したときに模型定盤の盤面と一致する鋳枠当接面が形成されたライナを前記下盛枠の内周に固定したので、高価な下盛枠と模型定盤とが直接摺動して摩耗することを防止することができる。また、ライナ上面が鋳枠との当接で摩耗した場合、安価なライナを取替えることで容易に対処することができる。
【００２４】
【実施の形態】
以下本発明に係る鋳型造型方法及びこの方法を実施するための装置の実施形態を図面に基づいて説明する。図１において、１は装置本体２に上下方向の造型経路に沿って移動可能に装架された断面長方形のスクイズテーブルで、装置本体２に固定されたシリンダ装置３のピストン４（図９）のピストンロッド４ａ上端に固定されて上下方向に進退移動されるようになっている。５は装置本体２に取付けられて水平方向に互いに平行に延在する一対のローラコンベアで、直方体のマスタプレート６の下方フランジ部の両側下面を係脱可能に支持している。次に使用されるマスタプレート６はローラコンベア５上で図略の停止装置によりスクイズテーブル１と対向する交換位置に位置決めされ、シリンダ装置３によって上昇されるスクイズテーブル１上に着脱可能に載置されるようになっている。スクイズテーブル１上に着脱可能に載置されるマスタプレート６を交換位置に係脱自在に保持するマスタプレート交換装置７は、一対のローラコンベア５に替えて、ターンテーブルで構成してもよい。マスタプレート６の両側下面を係脱可能に支持するフォーク状の支持部を両端に設けた交換アームを装置本体２に水平面内で割出し旋回可能に設け、次に使用されるマスタプレート６を支持した支持部がスクイズテーブル１と対向する交換位置に割出されるようにアームを割出し旋回し、下降するスクイズテーブル１上に載置された使用済みのマスタプレート６を交換位置に割出された空の支持部で受取るようにしてもよい。
【００２５】
マスタプレート６の上面には模型８が取付けられた模型定盤９が固定され、外周には下盛枠１０が模型定盤９を囲んで上下方向に進退可能に装架されている。スクイズテーブル１の４隅には、シリンダ装置１１が夫々垂直に取付けられ、マスタプレート６をスクイズテーブル１上に載置した状態でシリンダ装置１１のピストン１２を上昇させると、ピストンロッド１２ａの上端が下盛枠１０の４隅に下方に向けて突設されたロッド１４の下面に当接し、下盛枠１０をその上端の鋳枠当接面１５が模型定盤９の盤面１６より模型８側に位置する前進位置に前進させる。ピストン１２を下降させると、下盛枠１０は自重により鋳枠当接面１５が模型定盤９の盤面１６一致する後退位置まで後退する。シリンダ装置１１、ロッド１４等により下盛枠１０を進退移動させる下盛枠進退装置１７が構成されている。
【００２６】
図２に示すように、下盛枠１０の各辺には下面から上方に向かって有底穴２０が夫々設けられ、各有底穴２０に嵌合する棒状の係止部材２１がマスタプレート６の下方フランジ部２２から上方に立設されている。この有底穴２０の底部が係止部材２１の頭部に当接することにより下盛枠１０は鋳枠当接面１５が模型定盤９の盤面１６と一致する後退位置に位置される。２３は模型定盤の外周に嵌合してマスタプレート６の上面に固定されたスペーサで、その上面は盤面１６と、外周面はマスタプレート６の外周面と一致している。下盛枠１０の上方内周面にライナ２４が固定され、ライナ２４の内周面にはスペーサ２３が摺動可能に嵌合されている。ライナ２４の上端には下盛枠１０の上面を覆うフランジが外方に向かって設けられ、このフランジの上面に鋳枠当接面１５が形成されている。
【００２７】
３０は装置本体２に取付けられて水平方向に互いに平行に延在する一対のローラコンベアで、鋳枠３１の両側下面をマスタプレート交換装置１７の上方において係脱可能に支持している。次に型込めされる鋳枠３１はローラコンベア３０上で図略の停止装置により造型経路内でスクイズテーブル１と対向する鋳枠受渡位置に位置決めされ、シリンダ装置３によって上昇されるスクイズテーブル１上に載置されたマスタプレート６に嵌合された下盛枠１０がシリンダ装置１１により前進位置に上昇され、下盛枠１０に一体的に設けたライナ２４の鋳枠当接面１５上に鋳枠３１をローラコンベア３０から受取るようになっている。スクイズテーブル１に載置されたマスタプレート６との間で鋳枠３１を受け渡しする鋳枠受渡装置３２は、ローラコンベア３０等により構成されている。
【００２８】
３５は鋳枠３１の上面に係脱可能に載置される上盛枠で、装置本体２に造型経路内で上下方向に移動可能に装架されている。シリンダ装置３によるスクイズテーブル１の上昇につれて、マスタプレート６がスクイズテーブル１上に載置され、シリンダ装置１７の作動で前進位置に上昇された下盛枠１０上に鋳枠３１、上盛枠３５が順次重合される。
【００２９】
シリンダ装置３はスクイズテーブル１を図３に示す鋳物砂供給位置に停止させ、この位置で鋳物砂が公知の鋳物砂供給装置４０によって重合された前進位置に位置する下盛枠１０、鋳枠３１、上盛枠３５内に供給される。図１に示すように、装置本体２の上方にはシャトル４１が水平方向に移動可能に装架され、シリンダ装置４２により供給位置とスクイズ位置に割出し位置決めされるようになっている。鋳物砂供給装置４０はシャトル４１の下面に取付けられ、シャトル４１が供給位置に割出されたとき、重合された前進位置の下盛枠１０、鋳枠３１、上盛枠３５に鋳物砂供給装置４０が対向し、計量された鋳物砂６２を枠内に充填する。
【００３０】
シャトル４１の下面にはスクイズヘッド４５が鋳物砂供給装置４０と並んで取付けられ、シャトル４１がスクイズ位置に割出されるとスクイズヘッド４５がスクイズテーブル１と対向するようになっている。スクイズヘッド４５のヘッド本体４６には複数のシリンダ４７が垂直に設けられ、シリンダ４７に摺動可能に嵌合されたピストン４８の下方に突出したピストンロッド先端に加圧ヘッド４９が固定されている。加圧ヘッド４９は鋳枠３１の内側全域に亙って配置され、鋳枠３１に充填された鋳物砂６２を万遍なくスクイズするようになっている。図９に示すように、全てのシリンダ４７の上室４７ａは、レリーフ弁６９とシリンダ７０の左室７０ａとに並列に接続されている。レリーフ弁６９は、ピストンロッドと反対側の室である上室４７ａに接続されて、上室４７ａ内の圧力が設定値であるレリーフ圧以上になると圧油をタンクに排出する圧力制御弁を構成する。ヘッド本体４６の４隅にはシリンダ５０が垂直に設けられ、シリンダ５０にはピストン５１が上下方向に摺動可能に勘合され、ピストン５１のピストンロッド５１ａがヘッド本体４６の下方に突出し上盛枠３５の４隅に係脱可能に当接するようになっている。
【００３１】
上記のように構成した実施形態の作動を図９に示す油圧回路に基づいて説明する。マスタプレート６及び鋳枠３１がローラコンベア５，３０上を搬送され交換位置及び鋳枠受渡位置に夫々位置決めされ、シャトル４１がシリンダ装置４２により供給位置に割出し位置決めされている状態で、電磁切替弁５５が右位置に切替えられ、ポンプＰから供給される圧油がシリンダ装置３の下室３ａに供給され、スクイズテーブル１はピストン４により上昇されて交換位置でマスタプレート６をローラコンベア５から受取る。マスタプレート６がスクイズテーブル上に載置されると、電磁切替弁５６が左位置に切替わり圧油が同調シリンダ５７の隔壁で相互に隔離された４個のシリンダ室５８の各左室５８ａに供給される。各シリンダ室５８にはピストン５９が夫々嵌合され、４個のピストン５９はピストンロッド６０で互いに連結されているので、圧油が各シリンダ室５８の左室５８ａに供給されて４個のピストン５９が右進すると、各シリンダ室５８の右室５８ｂから同量の圧油が送出され、４個のシリンダ装置１１の下室１１ａに供給され、４個のピストン１２，ピストンロッド１２ａが同じ距離だけ同調して上昇し、ロッド１４に当接して下盛枠１０を平行に前進位置まで上昇させる。ピストン５９の右進端はピストンロッド６０に位置調節可能に固定された停止部材６１が同調シリンダ５７の側壁に当接することにより規制されるので、停止部材６１の位置調整により各シリンダ室５８の右室５８ｂからシリンダ装置１１の下室１１ａに供給される圧油量が調整されて下盛枠１０の前進位置が設定される。下盛枠１０が前進位置に上昇されると電磁切替弁５６は中立位置に切替えられ、同調シリンダ５７の各左室５８ａは、レリーフ弁６３を介してタンクに連通される。これにより下盛枠１０は、下方に押圧する力が一定値以上になりシリンダ装置１１の各下室１１ａから排出される圧油延いては同調シリンダ５７の各左室５８ａから送出される圧油がレリーフ弁６３のレリーフ圧以上になるまでは前進位置に保持される。
【００３２】
スクイズテーブル１はシリンダ装置３により更に上昇され、シリンダ装置１１によって前進位置に上昇された下盛枠１０が鋳枠３１を鋳枠受渡位置でローラコンベア３０から鋳枠当接面１５上に受取り、鋳枠３１が上盛枠３５を上面に載せた後に、電磁切替弁５５が中立位置に切替わり、シリンダ装置３の上下室３ａ，３ｂがブロックされてスクイズテーブル１は鋳物砂供給位置で一旦停止する。スクイズテーブル１の上方に割出し位置決めされている鋳物砂供給装置４０が作動し、重合された前進位置に位置する下盛枠１０、鋳枠３１、上盛枠３５内に所定量の鋳物砂６２が供給、充填される（図３）。
【００３３】
重合された各枠１０，３１，３５内に鋳物砂６２の充填が完了すると、シャトル４１がシリンダ装置４２によりスクイズ位置に割出され、スクイズヘッド４５がスクイズテーブル１と対向する。そして、スクイズテーブル１又はスクイズヘッド４５を互いに接近させて鋳物砂６２をスクイズして鋳型を造型する。
【００３４】
即ち、電磁切替弁６５，６６を左位置に切替えてシリンダ５０の上室５０ａをタンクに連通し、ピストン５１、ピストンロッド５１ａを自由後退可能として上盛枠３５のスクイズヘッド４５に対する相対的上方移動を許容する状態にする。電磁切替弁６７を左位置に切替えて全シリンダ４７の上室４７ａをレリーフ弁６９を介してタンクに連通し、電磁切替弁６８を右位置に切替えてシリンダ７０の右室７０ｂをタンクに連通する。この状態でスクイズテーブル１がシリンダ装置３により上昇されスクイズヘッド４５に接近されると、重ねられた各枠１０，３１，３５及び枠内に充填された鋳物砂６２が一緒に上昇されるので、ピストン５１はピストンロッド５１ａと上盛枠３５との当接により上方に移動される。加圧ヘッド４９が鋳物砂６２に押されて上昇し、ピストン４８が上昇すると全シリンダ４７の上室４７ａから送出される圧油はシリンダ７０の左室７０ａに供給され、シリンダ７０の右室７０ｂから送出される圧油は電磁切替弁６８を介してタンクに排出される。シリンダ７０に嵌合するピストン７１が右進端まで移動すると全シリンダ４７の上室４７ａを互いに連通してシリンダ７０の左室７０ａに接続する管路はブロックされるので、各加圧ヘッド４９は鋳物砂６２上面の硬さに応じて若干進退するが、複数のピストン４８は全体として上方移動を規制されるので、スクイズテーブル１の上昇により重合された枠内の鋳物砂６２が各加圧ヘッド４９により背面側予備スクイズ圧力で背面側予備スクイズされる（図４）。これによりシリンダ装置３の下室３ａ内の圧力が上昇し、この下室３ａに圧油を供給する配管途中に接続された圧力センサ７２により下室３ａ内の圧力が背面側予備スクイズ圧力に対応する第１所定圧力に達したことが検出されると、電磁切替弁６５が右位置に切替わり模型面側スクイズが行われる。
【００３５】
即ち、電磁切替弁６５が右位置に切替わるとシリンダ５０の上室５０ａがブロックされてピストン５１、ピストンロッド５１ａの後退が規制され、上盛枠３５のスクイズヘッド４５に対する相対的な上方移動が規制される。この状態でスクイズテーブル１はシリンダ装置３により更に上昇され、下盛枠１０がマスタプレート６に対し後退位置に相対的に後退する（図５）。即ち、後退を規制されたピストンロッド５１ａと当接する上盛枠３５及びこれと重合する鋳枠３１、下盛枠１０は上昇を規制されているので、スクイズテーブル１の上昇によりマスタプレート６の下面フランジ部２２から上方に立設した各係止部材２１の頭部が下盛枠１０の各有底穴２０の底部に当接するまでマスタプレート６が下盛枠１０に対し相対的に上昇し、下盛枠１０は鋳枠当接面１５と模型定盤９の盤面１６とが一致する後退位置にマスタプレート６に対して相対的に後退される。これにより加圧ヘッド４９により後退を規制された鋳物砂６２は模型８及び模型定盤９により下盛枠１０の前進位置と後退位置との間の所定距離だけ模型面側スクイズされる。このとき、下盛枠１０を進退させるシリンダ装置１１の進退移動を制御する電磁切替弁５６は中立位置に切替えられているので、下盛枠１０がスクイズテーブル１に対して強制的に後退され、各シリンダ装置１１の下室１１ａ延いては同調シリンダ５７の各左室５８ａから送出される圧油はその圧力がレリーフ弁６３のレリーフ圧より大きくなってレリーフ弁６３からタンクに排出される。模型面側スクイズにおいて、鋳物砂６２のコンパクタビリティが低くて下盛枠１０が後退位置に後退する前に、スクイズヘッド４５に設けたシリンダ４７の上室４７ａ内の圧力がレリーフ弁６９のレリーフ圧以上になると、ピストン４８、加圧ヘッド４９が後退し、鋳物砂６２、模型定盤９が上昇して下盛枠１０は鋳枠当接面１５と模型定盤９の盤面１６とが一致する後退位置に後退する。下盛枠１０が後退位置に後退すると、スクイズテーブル１の上昇が規制され、シリンダ装置３の下室３ａ内の圧力は上昇する。この下室３ａ内の圧力上昇が圧力センサ７２により検出されると、電磁切替弁６５が左位置に切替わり背面側スクイズが行われる。
【００３６】
即ち、電磁切替弁６５が左位置に切替わるとシリンダ５０の上室５０ａがタンクに連通し、ピストン５１、ピストンロッド５１ａを自由後退可能として上盛枠３５のスクイズヘッド４５に対する相対的上方移動を許容する状態にし、電磁切替弁６７を右位置に切替えてレリーフ弁６９をチェック弁７３、減圧弁７４を介してポンプＰに連通する。ポンプＰから吐出される圧油は減圧弁７４により低圧に減圧されているが、模型面側スクイズ終了後のシリンダ４７の上室４７ａから減圧弁７４に圧油が逆流することは逆止弁７３により阻止される。この状態でスクイズテーブル１がシリンダ装置３により更に上昇され、スクイズテーブル１の上昇により、重合された下枠１０、鋳枠３１、上枠３５内の鋳物砂６２が加圧ヘッド４９により背面側スクイズ圧力で背面側スクイズされる（図６）。これによりシリンダ装置３の下室３ａ内の圧力が上昇し、下室３ａ内の圧力が背面側スクイズ圧力に対応する第２所定圧力に達したことが圧力センサ７２により検出されると背面側スクイズは完了する。
【００３７】
背面側スクイズが完了すると、スクイズテーブル１はシリンダ装置３により下降され、鋳枠３１が上盛枠３５から離れる。電磁切替弁５６が左位置に切替わり、圧油が同調シリンダ５７の各左室５８ａに供給され、各右室５８ｂから送出される圧油がシリンダ装置１１の下室１１ａに供給される。これにより下盛枠１０が前進位置に上昇され、鋳枠当接面１５に載置された鋳枠３１もマスタプレート６、模型定盤９、模型８に対して相対的に上昇されるので、鋳枠３１がローラコンベア３０に上に受け渡される前に、模型８は鋳枠３１内に形成された鋳型から離型する（図７）。
【００３８】
スクイズテーブル１は更に下降され、下盛枠１０はローラコンベア３０上に載置された鋳枠３１から離れる。鋳枠３１はローラコンベア３０により図略の注湯ステーションに搬送される。スクイズテーブル１が下降端に下降される前に、マスタプレート６はローラコンベア５上に受け渡される（図８）。
【００３９】
スクイズテーブル１が下降端に位置すると、電磁切替弁５５を中立位置に切替えてシリンダ装置３を停止させ、電磁切替弁５６を右位置に切替えてシリンダ装置１１のピストン１２を下降端に戻し、電磁切替弁６５，６６を右位置に切替えてピストン５１を下降端に復帰させ、電磁切替弁６８を左位置に切替えてピストン７１を左進端に、各ピストン４８を下降位置に戻す。そして、先に上型の鋳型を造型したのであれば、次は下型用の模型８が取付けられたマスタプレート６が交換位置に位置決めされ、空の鋳枠３１が鋳枠受渡位置に位置決めされ、前述のサイクルが繰返される。
【００４０】
上記実施形態では、下盛枠進退装置１７として、スクイズテーブル１の４隅にシリンダ装置１１を設け、このシリンダ装置１１のピストン１２、ピストンロッド１２ａの進退作動で下盛枠１０を前進位置と後退位置との間で移動させるようにしているが、図１０に示すように、スクイズテーブル１の下方に環状ピストン７５を一体的に設け、環状ピストン７５に環状シリンダ７６を上下動可能に嵌合し、環状シリンダ７６の上下移動により下盛枠１０を前進位置と後退位置との間で移動させるようにしてもよい。
【００４１】
上記実施形態では、シリンダ装置３１、ロッド１４等で下盛枠１０を進退させる下盛枠進退装置１７を構成しているが、図１１に示すように、マスタプレート６の下方フランジ部２２の上面と下盛枠１０の下面との間に圧縮スプリング８０を介装し、マスタプレート６の下方フランジ部２２に穿設した段付き孔８１に嵌合し圧縮スプリング８０を貫通して上方に延在するロッド８２の上端を下盛枠１０の下面に固定し、このロッド８２の下端に設けた大径の停止部８３が段付き孔８１の肩部に当接することにより下盛枠１０を前進端に位置決めするようにして下盛枠進退装置１７を構成してもよい。この場合、圧縮スプリング８０の撥力により下盛枠１０は前進位置に前進され、上盛枠のスクイズヘッド４５に対する相対的な上方移動を規制した状態でスクイズテーブル１が上昇されることにより、下盛枠１０が圧縮スプリング８０の撥力に抗して後退位置に後退される。
【００４２】
上記実施形態では、シリンダ装置３によるスクイズテーブル１の上昇移動により、背面側予備スクイズ、模型面側スクイズ、背面側スクイズの全てを行っているが、スクイズヘッド４５をシリンダ装置を介してシャトル４１に取付け、スクイズテーブル１が図３に示す鋳物砂供給位置に停止され、重合した下盛枠１０、鋳枠３１、上盛枠３５に鋳物砂が充填されると、シャトル４１をスクイズ位置に割出してスクイズヘッド４５をスクイズテーブル１に対向させ、その後、スクイズヘッド４５をシリンダ装置により下降してスクイズテーブル１に接近させ、背面側予備スクイズ、模型面側スクイズ、背面側スクイズを行うようにしてもよい。
【００４３】
上記実施形態では、スクイズテーブル１上にマスタプレート６を着脱可能に載置し、マスタプレート交換装置７によりマスタプレート６を交換可能としているが、同一模型の鋳型を多数造型する場合は、マスタプレート６の交換を行わないようにし、スクイズテーブル１とマスタプレート６とを一体で構成するようにしてもよい。
【００４４】
上記実施形態では、スクイズヘッド４５を複数の加圧ヘッド４９を備えたマルチセグメントヘッドとしたが、鋳枠３１の内側と略同形の単一のヘッドとしてもよい。
【００４５】
上記実施形態では、背面側予備スクイズ、模型面側スクイズ、背面側スクイズにより鋳物砂をスクイズして鋳型を造型しているが、背面側予備スクイズと模型面側スクイズとの組合せ、または背面側スクイズのみで鋳型を造型するようにしてもよい。
【００４６】
上記実施形態では、背面側予備スクイズ、模型面側スクイズ、背面側スクイズにより鋳物砂をスクイズして鋳型を造型しているが、加圧ヘッドによる背面側予備スクイズに替えて、重ねられた下盛枠と鋳枠と上盛枠に鋳物砂が供給された後、スクイズヘッドを取囲むように設けられたカバーと上盛枠とを気密を保って当接させ、カバーに圧縮空気を供給して空気圧により鋳物砂を予備圧縮するようにしてもよい。
【図面の簡単な説明】
【図１】本発明に係る鋳型造型装置を示す図である。
【図２】マスタプレートの一部拡大断面図である。
【図３】鋳物砂を枠内に充填した状態を示す図である。
【図４】背面側予備スクイズを行っている状態を示す図である。
【図５】模型面側スクイズを行っている状態を示す図である。
【図６】背面側スクイズを行っている状態を示す図である。
【図７】離型状態を示す図である。
【図８】１サイクル完了時の状態を示す図である。
【図９】本発明に係る鋳型造型装置の油圧回路図である。
【図１０】下盛枠進退装置の第２の実施形態を示す図である。
【図１１】下盛枠進退装置の第３の実施形態を示す図である。
【符号の説明】
１…スクイズテーブル、２…装置本体、３，１１，４２…シリンダ装置、６…マスタプレート、７…マスタプレート交換装置、８…模型、９…模型定盤、１０…下盛枠、１５…鋳枠当接面、１６…盤面、１７…下盛枠進退装置、２０…有底穴部、２１…係止部材、２３…スペーサ、２４…ライナ、３１…鋳枠、３２…鋳枠受渡装置、３５…上盛枠、４０…鋳物砂供給装置、４１…シャトル、４５…スクイズヘッド、４９…加圧ヘッド、５０…シリンダ、５１…ピストン、５５，５６，６５，６６，６７，６８…電磁切替弁、５７…同調シリンダ、６３，６９…レリーフ弁、７２…圧力センサ、７５…環状ピストン、７６…環状シリンダ。[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a mold molding method and a mold molding apparatus for performing the method.
[0002]
[Prior art]
For example, in a mold molding apparatus described in Japanese Patent Application Laid-Open No. 56-1245, as the squeeze table is raised by a cylinder device, a model in which a lower frame is fitted on the outer periphery so as to be able to move up and down is placed on the upper surface of the squeeze table. The casting frame is received at the casting frame delivery position on the upper surface of the lower casting frame located at the advanced position, and the upper filling frame is brought into contact with the upper surface of the casting frame. The molding sand is supplied into the frame, and after the molding sand is supplied, the contact surface of the lower squeeze frame with the casting frame of the lower squeeze frame retreats in a state in which the rise of the upper sill frame is regulated by a cylinder device provided on the squeeze head. The casting sand is raised until it retreats to the position, and the molding sand is squeezed on the model surface side.After the model surface squeezing is completed, the restriction on raising the upper filling frame by the cylinder device is released, the squeeze table is raised, and the molding sand is raised. Squeezed, after back-side squeeze completed, the squeeze table is lowered, and releasing the model from the mold and placed on the roller conveyor in the molding flask delivery position in the middle lowered the drag flask.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional mold making apparatus, since the casting frame is placed on the roller conveyor and then the model is further lowered and released from the mold. The mold could not be maintained, and the mold was squared or the edge of the protrusion was cut off. The casting cast with such a mold had burrs or defective products.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a structural feature of the invention according to claim 1 is that a squeeze table and a squeeze head are provided so as to be relatively movable forward and backward along a molding path, and a model is attached. The lower filling frame provided on the squeeze table so as to be able to advance and retreat in the direction of the path surrounding the model platen is advanced to a forward position in which the casting frame contact surface is located closer to the model than the model surface of the model platen. As the table advances, the casting flask is placed on the casting flask abutment surface of the lower casting frame at the casting flask delivery position, and the upper filling frame is sequentially superimposed on the casting flask. The molding sand is supplied into the filling frame, and after the molding sand is supplied, the squeeze table or the squeeze head is brought close to each other to squeeze the molding sand to form a mold. Move the frame to the casting frame delivery position To be before the model is moved forward to the lower filling frame is to release from the mold.
[0005]
A structural feature of the invention according to claim 2 is that a squeeze table and a squeeze head which are relatively opposed to each other along a molding path by a driving device and a squeeze head are provided in the apparatus main body, and the In the molding path, a molding form delivery device for delivering the molding form is provided, and an upper filling frame is provided so as to be movable along the molding path between the molding form delivery device and the squeeze head. Is provided on a squeeze table so as to be able to advance and retreat in the direction of the path surrounding the model base plate on which the model is mounted, and the lower filling frame is modeled from a retreat position where the casting frame contact surface coincides with the base surface of the base plate and the base surface. To and from the forward position located on the sideEquipped with lower frame advance / retreat deviceAn apparatus for supplying molding sand into a lower filling frame, a casting frame, and an upper filling frame located at an advanced position superimposed by the advancement of the squeeze table by the driving device, and the squeeze table or the squeeze head after supplying the molding sand. The squeeze table is retracted by the driving device to transfer the casting flask to the flask feeding device after the squeezing table is retracted by the driving device after the molding sand is squeezed by approaching each other by the driving device to squeeze the casting sand and finish the squeezing. Then, the lower frame is moved forward by a lower frame moving device to release the model from the mold.
[0006]
A squeeze table and a squeeze head, which are relatively opposed to each other along a molding path by a driving device, are provided on a main body of the apparatus. In the molding path, a molding form delivery device for delivering the molding form is provided, and an upper filling frame is provided so as to be movable along the molding path between the molding form delivery device and the squeeze head. Is provided on a squeeze table so as to be able to advance and retreat in the direction of the path surrounding the model base plate on which the model is mounted, and the lower filling frame is modeled from a retreat position where the casting frame contact surface coincides with the base surface of the base plate and the base surface. To and from the forward position located on the sideEquipped with lower frame advance / retreat deviceA device for supplying molding sand into a lower filling frame, a casting frame, and an upper filling frame located at an advanced position superimposed by the advancement of the squeeze table by the driving device, and the squeezing head and the upper The squeeze table or the squeeze head is approached to each other by the driving device in a state where relative movement in the molding path direction with the filling frame is allowed to perform preliminary squeezing of the molding sand on the back side, and the path between the squeeze head and the upper filling frame. The squeeze table or the squeeze head is brought close to each other by the driving device until the lower filling frame is retracted to the retracted position in a state where the relative movement in the direction is restricted, and the molding sand is squeezed on the model surface side, and After the end, the squeeze table or the squeeze head is moved forward with the relative movement in the direction of the molding path between the squeeze head and the upper filling frame allowed. The squeezing of the foundry sand is brought closer to each other by the driving device, and after squeezing the back side squeezing, before the squeeze table is retracted by the driving device and before the casting flask is transferred to the flask feeding device, The underfill frame is advanced by an underlay frame moving device to release the model from the mold.
[0007]
A squeeze table and a squeeze head which are relatively moved up and down along a molding path by a driving device, and are removably mounted on the squeeze table. A master plate exchange device for detachably holding a master plate, a flask transfer device for transferring a flask between a master plate mounted on the squeeze table, and a vertically movable frame. An upper frame that is engaged with and disengaged from the upper surface of the casting frame is provided on the apparatus body, and a lower frame is provided on the master plate so as to be able to move up and down in a vertical direction around a model platen on which the model is mounted. It is moved back and forth between a retreat position where the frame contact surface coincides with the plate surface of the model platen and a forward position located on the model side from the plate surface.Equipped with lower frame advance / retreat deviceThe lower filling frame of the master plate placed on the squeeze table is located at the forward position by the lower filling frame moving device, and the lower plate located at the forward position overlapped by the raising of the squeeze table by the driving device. A squeeze table or a squeeze head provided with a device for supplying molding sand to a filling frame, a casting frame, and an upper filling frame, and in which vertical movement of the squeeze head and the upper filling frame is allowed after supply of the molding sand; The squeeze table or the squeeze head is moved by the drive device in a state where the casting sand is preliminarily squeezed on the back side by approaching each other by the drive device, and the relative movement of the squeeze head and the upper filling frame in the vertical direction is regulated. The molding sand is brought close to each other until the lower filling frame is lowered to the lowering position, and the molding sand is squeezed on the model surface side. After allowing the relative movement in the vertical direction of the head and the upper filling frame to allow the squeeze table or the squeeze head to approach each other by the driving device to squeeze molding sand on the back side, and after finishing the back side squeezing, Before lowering the squeeze table by the driving device and transferring the flask to the flask supply device, the lower filling frame is raised by a lower filling frame moving device to release the model from the mold. is there.
[0008]
According to a fifth aspect of the present invention, there is provided a mold forming apparatus according to the fourth aspect, wherein a bottomed hole is provided downward in the lower filling frame, and a rod-shaped engaging member is fitted into the bottomed hole. A stop member is provided on the master plate, and the bottom of the bottom frame is brought into contact with the head of the locking member so that the lower abutment frame is in a retracted position where the mold contact surface coincides with the plate surface of the model platen. Positioning.
[0009]
The structural feature of the invention according to claim 6 is that, in the mold molding apparatus according to any one of claims 3 to 5, the squeeze head is slidable in a molding path direction on a cylinder provided on a head body. A pressure head is provided at the tip of the piston rod of the fitted piston, and a pressure control valve is provided in a chamber of the cylinder opposite to the piston rod for discharging pressurized oil when the pressure in the chamber exceeds a set value. When the casting sand is squeezed on the model surface side, the chamber is blocked, and when the pressure in the chamber becomes equal to or higher than a set value, the pressure control valve is operated to move the pressurizing head to the retreat position or the descending position. Retreat until you retreat.
[0010]
Claim 7The structural features of the invention according to claim 2 are claims 2 toClaim 6In the mold making apparatus according to any one of the above, the lower frame advance / retreat device is constituted by a plurality of cylinder devices, and the supply / discharge of pressure oil to / from the plurality of cylinder devices is tuned by a tuning cylinder. .
[0011]
Claim 8The structural features of the invention according to claim 2 are claims 2 toClaim 6In the mold making device according to any one of the above, the lower frame advance / retreat device is constituted by an annular piston integrally provided below the squeeze table and an annular cylinder fitted to the annular piston.
[0012]
Claim 9The structural features of the invention according to claim 2 are claims 2 toClaim 8Wherein the spacer interposed between the outer periphery of the model platen and the inner periphery of the lower frame is fixed to the master plate.
[0013]
Claim 10The structural features of the invention according toClaim 9In the mold forming apparatus according to the above, the inner peripheral surface to be fitted to the outer peripheral surface of the spacer and the casting frame contact surface that matches the surface of the model surface plate when the lower filling frame is located at the retracted position are formed. Is fixed to the inner periphery of the lower filling frame.
[0014]
[Action and Effect of the Invention]
In the invention according to claim 1 configured as described above, as the squeeze table is opposed to the squeeze head, the casting form is placed on the casting form contact surface of the lower filling frame located at the forward end. The molding sand is sequentially polymerized on the casting flask, the molding sand is supplied into the superimposed lower molding frame, the molding flask and the upper molding frame, and the molding sand is squeezed by bringing the squeeze table or the squeezing head close to each other to form a mold. Then, after the squeeze is completed, before the squeeze table is retracted and the flask is returned to the flask delivery position, the lower filling frame is advanced to release the model from the mold. The model can be released from the mold while being kept horizontal, and the mold can be molded while preventing the mold from being squared or the protruding portion being cut off.
[0015]
In the invention according to claim 2 configured as described above, the squeeze table facing the squeeze head is advanced by the driving device, and the flask is placed on the casting frame abutting surface of the lower filling frame located at the forward end. The upper filling frame is sequentially superimposed on the casting frame, the molding sand is supplied into the superimposed lower filling frame, the casting frame and the upper filling frame, and after the supply of the molding sand, the squeeze table or the squeeze head is driven by the driving device. After approaching each other to squeeze the molding sand to form a mold, and after squeezing is completed, before the squeeze table is retracted by the driving device and the casting flask is transferred to the flask feeding device, the lower filling frame is formed. Was advanced by the lower frame advance / retreat device to release the model from the mold, so that the model can be released from the mold while the casting frame is kept horizontal, and the molded mold is squared, Or the edge of the protrusion It is possible to provide a casting mold making system not to live.
[0016]
In the invention according to claim 3 configured as described above, the squeeze table facing the squeeze head is advanced by the driving device, and the flask is placed on the flask contact surface of the lower embankment located at the forward end. The upper filling frame is sequentially superimposed on the casting frame, the molding sand is supplied into the superimposed lower filling frame, the casting frame, and the upper filling frame, and after the molding sand is supplied, the molding path direction between the squeeze head and the upper filling frame. The squeeze table or the squeeze head is moved closer to each other by the driving device in a state where relative movement of the squeeze head is allowed to perform preliminary squeezing of the molding sand on the back side, and the relative movement of the squeeze head and the upper filling frame in the molding path direction is regulated. The squeeze table or squeeze head is moved closer to each other by the driving device until the lower filling frame retreats to the retreat position, and the molding sand is squeezed on the model surface side. The squeeze table or the squeeze head is moved closer to each other by the driving device in a state where relative movement in the molding path direction between the mold and the upper filling frame is allowed to squeeze the molding sand on the back side, and after the squeezing on the back side, Before the squeeze table is retracted by the driving device and the flask is transferred to the flask supply device, the lower filling frame is advanced by a lower filling frame moving device to release the model from the mold. Therefore, a mold with uniform strength can be molded, and the model can be released from the mold while the casting frame is kept horizontal, so that the molded mold is squared or the projection is cut off. It is possible to provide a mold making apparatus without any problem.
[0017]
In the invention according to claim 4 configured as described above, the squeeze table is raised by the driving device, and the master plate fitted with the lower filling frame on the outer periphery so as to be able to move up and down is received from the model changing device and placed on the squeeze table. Placed, the casting flask is received from the casting flask delivery device on the upper face of the lower casting frame positioned at the forward position by the lower casting frame advance / retreat device, the upper casting frame is engaged with the upper face of the casting flask, and the superimposed lower casting frame is And the casting frame and the upper filling frame are supplied with molding sand, and the squeeze table or the squeezing head is mutually moved by the driving device in a state where the vertical movement of the squeezing head and the upper filling frame is allowed after the supply of the molding sand. The squeeze table or the squeeze head is moved downward by the driving device in a state in which the casting sand is approached to pre-squeeze the casting sand on the rear side and the relative movement in the vertical direction between the squeeze head and the upper filling frame is regulated. The squeeze table or the squeeze table or the squeeze table in a state where the relative movement in the vertical direction of the squeeze head and the upper filling frame is allowed after the model surface side squeezing is completed, and the casting sand is squeezed by approaching each other until the retreat position is reduced. The squeeze heads are moved closer to each other by the driving device to squeeze the molding sand on the rear side, and after the rear squeezing is completed, the squeeze table is lowered by the driving device to transfer the flask to the flask feeding device. Before, the lower frame is advanced by the lower frame advance / retreat device to release the model from the mold. Therefore, a cylinder device for moving the lower frame to a master plate on which the model is mounted and its piping. The master plate can be easily exchanged when the model is replaced without providing It can release, subjected corner mold, or edge breakage of the protrusions can be provided casting mold making system never occur.
[0018]
In the invention according to claim 5 configured as described above, in the mold molding apparatus according to claim 4, the bottom of the bottomed hole provided downward in the lower filling frame is provided in the master plate, The lower filling frame is positioned at the retracted position by abutting on the head of the bar-shaped locking member fitted into the bottomed hole, thereby preventing casting sand and dust from adhering to the head of the locking member. This makes it possible to ensure good horizontality of the lower filling frame and the casting flask in the retracted position and prevent molding of a defective mold.
[0019]
In the invention according to claim 6 configured as described above, when the casting sand is squeezed on the model surface side, when the pressure of the cylinder fitted with the piston connected to the pressure head becomes equal to or higher than a set value, the pressure control valve Operates and the pressurizing head retreats to allow the relative rise of the squeeze table, and the lower filling frame is retracted to the retracted position with respect to the squeeze table. The casting frame abutment surface of the filling frame can be surely matched with the surface of the model surface plate.
[0020]
Configured as aboveClaim 7In the invention according to the second aspect, claims 2 toClaim 6In the mold making device according to any one of the above, the supply and discharge of the pressure oil to and from the plurality of cylinder devices for moving the lower filling frame are controlled by the tuning cylinder, so that the lower filling frame is translated with high accuracy. And the releasability of the model from the mold becomes extremely good.
[0021]
Configured as aboveClaim 8In the invention according to the second aspect, claims 2 toClaim 6In the mold molding apparatus according to any one of the above, the lower filling frame is moved forward and backward by an annular cylinder fitted to an annular piston integrally provided below the squeeze table, so that the lower filling frame is translated with high precision and the model is moved. Can be successfully released from the mold.
[0022]
Configured as aboveClaim 9In the invention according to the second aspect, claims 2 toClaim 8In the mold making apparatus according to any one of the above, since the spacer is interposed between the outer periphery of the model platen and the inner periphery of the lower filling frame, the outer periphery of the model platen is prevented from being worn by the reciprocating movement of the lower filling frame. When the outer peripheral surface of the spacer is worn, it can be easily dealt with by replacing an inexpensive spacer.
[0023]
Configured as aboveClaim 10In the invention according toClaim 9In the mold making apparatus according to the above, a liner having a casting frame contact surface that matches the surface of the model platen when the inner peripheral surface and the lower filling frame fitted to the outer peripheral surface of the spacer are located at the retracted position. Is fixed to the inner periphery of the lower filling frame, so that it is possible to prevent the expensive lower filling frame and the model surface plate from directly sliding and wearing. Further, when the upper surface of the liner is worn due to contact with the casting frame, it can be easily dealt with by replacing the inexpensive liner.
[0024]
Embodiment
Hereinafter, an embodiment of a mold making method and an apparatus for performing the method according to the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a squeeze table having a rectangular cross section which is mounted on the apparatus main body 2 so as to be movable along a vertical molding path. The squeeze table 1 has a piston 4 (FIG. 9) of a cylinder device 3 fixed to the apparatus main body 2. It is fixed to the upper end of the piston rod 4a and moves up and down in the vertical direction. Reference numeral 5 denotes a pair of roller conveyors attached to the apparatus main body 2 and extending horizontally in parallel with each other. The pair of roller conveyors 5 support the lower surfaces on both sides of the lower flange portion of the rectangular parallelepiped master plate 6 in a detachable manner. Next, the master plate 6 to be used is positioned at a replacement position facing the squeeze table 1 by a stop device (not shown) on the roller conveyor 5 and is detachably mounted on the squeeze table 1 raised by the cylinder device 3. It has become so. The master plate exchange device 7 that detachably holds the master plate 6 removably mounted on the squeeze table 1 at the exchange position may be configured by a turntable instead of the pair of roller conveyors 5. An exchange arm having fork-shaped support portions provided at both ends for detachably supporting the lower surfaces on both sides of the master plate 6 is provided on the apparatus main body 2 so as to be rotatable in a horizontal plane, and supports the next master plate 6 to be used. The arm is indexed and turned so that the supported portion indexed to the replacement position facing the squeeze table 1, and the used master plate 6 placed on the descending squeeze table 1 is indexed to the replacement position. You may make it receive in an empty support part.
[0025]
A model surface plate 9 on which a model 8 is mounted is fixed to the upper surface of the master plate 6, and a lower frame 10 is mounted on the outer periphery of the master plate 6 so as to be able to move up and down in a vertical direction around the model surface plate 9. At four corners of the squeeze table 1, cylinder devices 11 are vertically mounted, respectively. When the master plate 6 is placed on the squeeze table 1 and the piston 12 of the cylinder device 11 is raised, the upper end of the piston rod 12a is raised. The lower metal frame 10 is in contact with the lower surface of the rod 14 projecting downward at the four corners of the lower metal frame 10, and the casting frame contact surface 15 at the upper end of the lower metal frame 10 is closer to the model 8 than the surface 16 of the model surface plate 9. To the forward position located at. When the piston 12 is lowered, the lower frame 10 retreats by its own weight to a retreat position where the casting frame contact surface 15 coincides with the plate surface 16 of the model platen 9. A lower frame advance / retreat device 17 configured to move the lower frame 10 forward and backward by the cylinder device 11, the rod 14, and the like is configured.
[0026]
As shown in FIG. 2, each side of the lower filling frame 10 is provided with a bottomed hole 20 upward from the lower surface, and a bar-shaped locking member 21 fitted into each bottomed hole 20 is provided on the master plate 6. Is erected upward from the lower flange portion 22 of the upper case. When the bottom of the bottomed hole 20 comes into contact with the head of the locking member 21, the lower filling frame 10 is located at the retracted position where the casting frame contact surface 15 matches the plate surface 16 of the model platen 9. Reference numeral 23 denotes a spacer fitted on the outer periphery of the model platen and fixed to the upper surface of the master plate 6. The upper surface of the spacer 23 coincides with the outer surface of the master plate 6. A liner 24 is fixed to an upper inner peripheral surface of the lower filling frame 10, and a spacer 23 is slidably fitted to the inner peripheral surface of the liner 24. At the upper end of the liner 24, a flange covering the upper surface of the lower filling frame 10 is provided outward, and a casting frame contact surface 15 is formed on the upper surface of the flange.
[0027]
Reference numeral 30 denotes a pair of roller conveyors attached to the apparatus main body 2 and extending in parallel with each other in the horizontal direction. The lower surfaces of both sides of the casting frame 31 are detachably supported above the master plate changing device 17. Next, the casting flask 31 to be molded is positioned on the roller conveyor 30 by a stop device (not shown) at a casting flask delivery position facing the squeeze table 1 in the molding path, and is raised on the squeeze table 1 by the cylinder device 3. The lower frame 10 fitted to the master plate 6 placed on the lower frame 10 is raised to the forward position by the cylinder device 11 and cast on the frame contact surface 15 of the liner 24 provided integrally with the lower frame 10. The frame 31 is received from the roller conveyor 30. A flask transfer device 32 for transferring the flask 31 to and from the master plate 6 placed on the squeeze table 1 is composed of a roller conveyor 30 and the like.
[0028]
Reference numeral 35 denotes an upper pile frame which is detachably mounted on the upper surface of the casting frame 31, and is mounted on the apparatus main body 2 so as to be vertically movable in the molding path. As the squeeze table 1 is raised by the cylinder device 3, the master plate 6 is placed on the squeeze table 1, and the cast frame 31 and the upper frame 35 are placed on the lower filling frame 10 which has been raised to the advanced position by the operation of the cylinder device 17. Are sequentially polymerized.
[0029]
The cylinder device 3 stops the squeeze table 1 at the molding sand supply position shown in FIG. 3, and at this position, the lower filling frame 10 and the molding frame 31 are located at the advanced position where the molding sand is superimposed by the known molding sand supply device 40. , Are supplied into the upper pile 35. As shown in FIG. 1, a shuttle 41 is mounted above the apparatus main body 2 so as to be movable in a horizontal direction, and is indexed and positioned between a supply position and a squeeze position by a cylinder device 42. The foundry sand supply device 40 is attached to the lower surface of the shuttle 41, and when the shuttle 41 is indexed to the supply position, the foundry sand supply device is attached to the lower filling frame 10, the casting frame 31, and the upper filling frame 35 in the superimposed forward position. 40 faces each other and fills the frame with the measured foundry sand 62.
[0030]
A squeeze head 45 is mounted on the lower surface of the shuttle 41 along with the foundry sand supply device 40. When the shuttle 41 is indexed to the squeeze position, the squeeze head 45 faces the squeeze table 1. A plurality of cylinders 47 are provided vertically on a head body 46 of the squeeze head 45, and a pressure head 49 is fixed to a tip of a piston rod projecting below a piston 48 slidably fitted to the cylinder 47. . The pressure head 49 is arranged over the entire inner side of the flask 31 so as to uniformly squeeze the molding sand 62 filled in the flask 31. As shown in FIG. 9, the upper chambers 47a of all the cylinders 47 are connected in parallel to the relief valve 69 and the left chamber 70a of the cylinder 70.The relief valve 69 is connected to the upper chamber 47a, which is a chamber on the opposite side of the piston rod, and constitutes a pressure control valve for discharging pressurized oil to the tank when the pressure in the upper chamber 47a becomes equal to or higher than a set value, ie, a relief pressure. I do.At the four corners of the head main body 46, cylinders 50 are provided vertically, and a piston 51 is fitted to the cylinder 50 so as to be slidable in the vertical direction. The four corners 35 are detachably contacted.
[0031]
The operation of the embodiment configured as described above will be described based on the hydraulic circuit shown in FIG. When the master plate 6 and the casting flask 31 are conveyed on the roller conveyors 5 and 30 and positioned at the exchange position and the casting frame delivery position, respectively, and the shuttle 41 is indexed and positioned at the supply position by the cylinder device 42, the electromagnetic switching is performed. The valve 55 is switched to the right position, the pressure oil supplied from the pump P is supplied to the lower chamber 3a of the cylinder device 3, the squeeze table 1 is raised by the piston 4, and the master plate 6 is moved from the roller conveyor 5 at the exchange position. Receive. When the master plate 6 is placed on the squeeze table, the electromagnetic switching valve 56 is switched to the left position, and pressure oil is supplied to each of the left chambers 58a of the four cylinder chambers 58 separated from each other by the partition wall of the tuning cylinder 57. Supplied. A piston 59 is fitted in each cylinder chamber 58, and the four pistons 59 are connected to each other by a piston rod 60. Therefore, pressure oil is supplied to the left chamber 58a of each cylinder chamber 58 and the four pistons 59 When 59 moves to the right, the same amount of pressure oil is delivered from the right chamber 58b of each cylinder chamber 58 and supplied to the lower chambers 11a of the four cylinder devices 11, so that the four pistons 12 and the piston rod 12a are at the same distance. The lower filling frame 10 is raised in parallel to the forward position by contacting the rod 14. The rightward end of the piston 59 is regulated by the stop member 61 fixed to the piston rod 60 so that the position can be adjusted, abutting against the side wall of the tuning cylinder 57. The amount of pressure oil supplied from the chamber 58b to the lower chamber 11a of the cylinder device 11 is adjusted, and the forward position of the lower filling frame 10 is set. When the lower frame 10 is raised to the forward position, the electromagnetic switching valve 56 is switched to the neutral position, and each left chamber 58 a of the tuning cylinder 57 is communicated with the tank via the relief valve 63. As a result, the lower embossing frame 10 has a downward pressing force equal to or greater than a certain value, and the hydraulic oil discharged from each lower chamber 11a of the cylinder device 11 and the hydraulic oil discharged from each left chamber 58a of the tuning cylinder 57. Until the pressure becomes equal to or higher than the relief pressure of the relief valve 63.
[0032]
The squeeze table 1 is further raised by the cylinder device 3, and the lower filling frame 10 raised to the forward position by the cylinder device 11 receives the flask 31 from the roller conveyor 30 on the flask contact surface 15 at the flask transfer position, After the casting frame 31 puts the upper filling frame 35 on the upper surface, the electromagnetic switching valve 55 is switched to the neutral position, the upper and lower chambers 3a and 3b of the cylinder device 3 are blocked, and the squeeze table 1 is temporarily stopped at the casting sand supply position. I do. The foundry sand supply device 40 indexed and positioned above the squeeze table 1 is operated, and a predetermined amount of foundry sand 62 is placed in the lower filling frame 10, the casting frame 31, and the upper filling frame 35 located at the superimposed advanced position. Is supplied and filled (FIG. 3).
[0033]
When the filling of the casting sand 62 into the superimposed frames 10, 31, and 35 is completed, the shuttle 41 is indexed to the squeeze position by the cylinder device 42, and the squeeze head 45 faces the squeeze table 1. Then, the squeeze table 1 or the squeeze head 45 is moved closer to each other to squeeze the casting sand 62 to form a mold.
[0034]
That is, the electromagnetic switching valves 65 and 66 are switched to the left position, the upper chamber 50a of the cylinder 50 is communicated with the tank, and the piston 51 and the piston rod 51a can be freely retracted so that the upper frame 35 moves upward relative to the squeeze head 45. To a state that allows. The electromagnetic switching valve 67 is switched to the left position to communicate the upper chamber 47a of all cylinders 47 to the tank via the relief valve 69, and the electromagnetic switching valve 68 is switched to the right position to communicate the right chamber 70b of the cylinder 70 to the tank. . In this state, when the squeeze table 1 is raised by the cylinder device 3 and approaches the squeeze head 45, the stacked frames 10, 31, 35 and the molding sand 62 filled in the frames are raised together. The piston 51 is moved upward by the contact between the piston rod 51a and the upper frame 35. When the pressure head 49 is pushed by the molding sand 62 and rises, and the piston 48 rises, the pressure oil delivered from the upper chamber 47a of all the cylinders 47 is supplied to the left chamber 70a of the cylinder 70, and the right chamber 70b of the cylinder 70 Is discharged to the tank via the electromagnetic switching valve 68. When the piston 71 fitted to the cylinder 70 moves to the right advancing end, the pipeline connecting the upper chambers 47a of all the cylinders 47 to each other and connecting to the left chamber 70a of the cylinder 70 is blocked. Although the pistons 48 are slightly advanced or retracted according to the hardness of the upper surface of the molding sand 62, the upward movement of the plurality of pistons 48 is restricted as a whole. The back side pre-squeeze is performed by the back side pre-squeeze pressure by 49 (FIG. 4). As a result, the pressure in the lower chamber 3a of the cylinder device 3 rises, and the pressure in the lower chamber 3a corresponds to the back-side preliminary squeeze pressure by a pressure sensor 72 connected in the middle of a pipe for supplying pressure oil to the lower chamber 3a. When it is detected that the pressure reaches the first predetermined pressure, the electromagnetic switching valve 65 is switched to the right position, and the model surface side squeezing is performed.
[0035]
That is, when the electromagnetic switching valve 65 is switched to the right position, the upper chamber 50a of the cylinder 50 is blocked, the retraction of the piston 51 and the piston rod 51a is restricted, and the relative upward movement of the upper filling frame 35 with respect to the squeeze head 45 is prevented. Be regulated. In this state, the squeeze table 1 is further raised by the cylinder device 3, and the lower filling frame 10 retreats relatively to the retreat position with respect to the master plate 6 (FIG. 5). That is, since the upper filling frame 35 in contact with the piston rod 51a whose retraction is restricted, the casting frame 31 overlapping with this, and the lower filling frame 10 are restricted from rising, the lower surface of the master plate 6 is raised by raising the squeeze table 1. The master plate 6 rises relatively to the lower filling frame 10 until the head of each locking member 21 erected upward from the flange portion 22 contacts the bottom of each bottomed hole 20 of the lower filling frame 10, The lower filling frame 10 is retracted relatively to the master plate 6 to a retracted position where the casting frame contact surface 15 and the plate surface 16 of the model surface plate 9 coincide. As a result, the casting sand 62, whose retreat is restricted by the pressurizing head 49, is squeezed by the model 8 and the model base 9 by a predetermined distance between the advance position and the retreat position of the lower filling frame 10. At this time, since the electromagnetic switching valve 56 for controlling the forward / backward movement of the cylinder device 11 for moving the lower filling frame 10 is switched to the neutral position, the lower filling frame 10 is forcibly retracted with respect to the squeeze table 1, The pressure oil delivered from the lower chamber 11a of each cylinder device 11 and from each left chamber 58a of the tuning cylinder 57 has a pressure greater than the relief pressure of the relief valve 63 and is discharged from the relief valve 63 to the tank. In the squeeze on the model surface side, the pressure in the upper chamber 47a of the cylinder 47 provided on the squeeze head 45 is reduced by the relief pressure of the relief valve 69 before the lower filling frame 10 is retracted to the retracted position due to the low compactability of the casting sand 62. As described above, the piston 48 and the pressurizing head 49 are retracted, the molding sand 62 and the model surface plate 9 rise, and the casting frame contact surface 15 of the lower filling frame 10 coincides with the surface surface 16 of the model surface plate 9. Retract to the retracted position. When the lower frame 10 retreats to the retreat position, the elevation of the squeeze table 1 is restricted, and the pressure in the lower chamber 3a of the cylinder device 3 increases. When the pressure increase in the lower chamber 3a is detected by the pressure sensor 72, the electromagnetic switching valve 65 is switched to the left position, and the rear side squeezing is performed.
[0036]
That is, when the electromagnetic switching valve 65 is switched to the left position, the upper chamber 50a of the cylinder 50 communicates with the tank, and the piston 51 and the piston rod 51a are allowed to freely retreat, so that the upper frame 35 moves upward relative to the squeeze head 45. The state is allowed, the electromagnetic switching valve 67 is switched to the right position, and the relief valve 69 is connected to the pump P via the check valve 73 and the pressure reducing valve 74. Although the pressure oil discharged from the pump P is reduced to a low pressure by the pressure reducing valve 74, the pressure oil flows back to the pressure reducing valve 74 from the upper chamber 47 a of the cylinder 47 after the squeeze on the model surface side. Is blocked by In this state, the squeeze table 1 is further raised by the cylinder device 3, and as a result of the raising of the squeeze table 1, the molding sand 62 in the lower frame 10, the casting frame 31, and the upper frame 35, which has been polymerized, is squeezed on the rear side by the pressing head 49. The back side is squeezed by pressure (FIG. 6). As a result, the pressure in the lower chamber 3a of the cylinder device 3 increases, and when the pressure sensor 72 detects that the pressure in the lower chamber 3a has reached the second predetermined pressure corresponding to the rear squeeze pressure, the rear side squeezing is performed. Is completed.
[0037]
When the back side squeezing is completed, the squeeze table 1 is lowered by the cylinder device 3, and the casting frame 31 is separated from the upper embossing frame 35. The electromagnetic switching valve 56 is switched to the left position, pressure oil is supplied to each left chamber 58a of the tuning cylinder 57, and pressure oil delivered from each right chamber 58b is supplied to the lower chamber 11a of the cylinder device 11. As a result, the lower filling frame 10 is raised to the forward position, and the casting flask 31 placed on the casting flask contact surface 15 is also raised relative to the master plate 6, the model platen 9, and the model 8, so that Before the flask 31 is transferred onto the roller conveyor 30, the model 8 is released from the mold formed in the flask 31 (FIG. 7).
[0038]
The squeeze table 1 is further lowered, and the lower filling frame 10 is separated from the casting flask 31 placed on the roller conveyor 30. The casting flask 31 is conveyed by a roller conveyor 30 to a pouring station (not shown). Before the squeeze table 1 is lowered to the lower end, the master plate 6 is transferred onto the roller conveyor 5 (FIG. 8).
[0039]
When the squeeze table 1 is located at the lower end, the electromagnetic switching valve 55 is switched to the neutral position to stop the cylinder device 3, the electromagnetic switching valve 56 is switched to the right position, and the piston 12 of the cylinder device 11 is returned to the lower end. The switching valves 65 and 66 are switched to the right position to return the piston 51 to the lower end. The electromagnetic switching valve 68 is switched to the left position to return the piston 71 to the left advancing end and return each piston 48 to the lower position. If the upper mold is formed first, the master plate 6 on which the lower mold 8 is mounted is positioned at the replacement position, and the empty flask 31 is positioned at the flask delivery position. , And the above-described cycle is repeated.
[0040]
In the above embodiment, cylinder devices 11 are provided at the four corners of the squeeze table 1 as the lower frame moving device 17, and the lower frame 10 is moved to the forward position and the backward position by the reciprocating operation of the piston 12 and the piston rod 12a of the cylinder device 11. 10, an annular piston 75 is integrally provided below the squeeze table 1, and an annular cylinder 76 is fitted to the annular piston 75 so as to be movable up and down, as shown in FIG. Alternatively, the lower filling frame 10 may be moved between the forward position and the backward position by moving the annular cylinder 76 up and down.
[0041]
In the above embodiment, the lower frame advance / retreat device 17 for moving the lower frame 10 forward and backward by the cylinder device 31, the rod 14, and the like is configured, but as shown in FIG. A compression spring 80 is interposed between the lower plate 10 and the lower surface of the lower frame 10, and is fitted into a stepped hole 81 formed in the lower flange portion 22 of the master plate 6 and extends upward through the compression spring 80. The upper end of the rod 82 to be fixed is fixed to the lower surface of the lower filling frame 10, and the large-diameter stopping portion 83 provided at the lower end of the rod 82 abuts the shoulder of the stepped hole 81 so that the lower filling frame 10 is moved to the forward end. The lower frame advance / retreat device 17 may be configured so as to be positioned at the position shown in FIG. In this case, the lower filling frame 10 is advanced to the forward position by the repulsive force of the compression spring 80, and the squeeze table 1 is raised in a state where the relative upward movement of the upper filling frame with respect to the squeeze head 45 is regulated. The filling frame 10 is retracted to the retracted position against the repulsion of the compression spring 80.
[0042]
In the above embodiment, all of the back side preliminary squeeze, the model surface side squeeze, and the back side squeeze are performed by the upward movement of the squeeze table 1 by the cylinder device 3, but the squeeze head 45 is transferred to the shuttle 41 via the cylinder device. When the mounting and the squeeze table 1 are stopped at the molding sand supply position shown in FIG. 3 and the superimposed lower filling frame 10, the casting frame 31, and the upper filling frame 35 are filled with the molding sand, the shuttle 41 is indexed to the squeezing position. Then, the squeeze head 45 is opposed to the squeeze table 1, and then the squeeze head 45 is lowered by the cylinder device to approach the squeeze table 1 to perform the back side preliminary squeeze, the model side squeeze, and the back side squeeze. Good.
[0043]
In the above embodiment, the master plate 6 is removably mounted on the squeeze table 1 and the master plate 6 can be exchanged by the master plate exchanging device 7. However, when many molds of the same model are to be molded, the master plate 6 is required. 6, the squeeze table 1 and the master plate 6 may be integrally formed.
[0044]
In the above embodiment, the squeeze head 45 is a multi-segment head including a plurality of pressure heads 49, but may be a single head having substantially the same shape as the inside of the flask 31.
[0045]
In the above embodiment, the back side preliminary squeeze, the model side squeeze, the casting mold sand is squeezed by the back side squeeze to mold the mold, but a combination of the back side preliminary squeeze and the model side squeeze, or the back side squeeze. The mold may be formed only by using the mold.
[0046]
In the above embodiment, the mold is formed by squeezing the casting sand by the back side preliminary squeeze, the model surface side squeeze, and the back side squeeze. After the casting sand is supplied to the frame, the casting frame and the upper filling frame, the cover provided to surround the squeeze head is brought into contact with the upper filling frame while keeping the airtight, and compressed air is supplied to the cover. The molding sand may be pre-compressed by air pressure.
[Brief description of the drawings]
FIG. 1 is a view showing a mold making apparatus according to the present invention.
FIG. 2 is a partially enlarged sectional view of a master plate.
FIG. 3 is a view showing a state in which molding sand is filled in a frame.
FIG. 4 is a diagram illustrating a state in which a back side preliminary squeeze is being performed.
FIG. 5 is a diagram showing a state where squeezing is performed on the model surface side.
FIG. 6 is a diagram illustrating a state in which back side squeezing is performed.
FIG. 7 is a diagram showing a release state.
FIG. 8 is a diagram showing a state at the time of completion of one cycle.
FIG. 9 is a hydraulic circuit diagram of the mold making apparatus according to the present invention.
FIG. 10 is a view showing a second embodiment of a lower frame moving device.
FIG. 11 is a diagram showing a third embodiment of a lower frame advance / retreat device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Squeeze table, 2 ... Device main body, 3, 11, 42 ... Cylinder device, 6 ... Master plate, 7 ... Master plate exchange device, 8 ... Model, 9 ... Model platen, 10 ... Lower frame, 15 ... Casting Frame contact surface, 16: board surface, 17: lower frame advance / retreat device, 20: bottomed hole, 21: locking member, 23: spacer, 24: liner, 31: cast frame, 32: cast frame delivery device, 35: Upper frame, 40: Foundry sand supply device, 41: Shuttle, 45: Squeeze head, 49: Pressure head, 50: Cylinder, 51: Piston, 55, 56, 65, 66, 67, 68: Electromagnetic switching Valve, 57: tuning cylinder, 63, 69: relief valve, 72: pressure sensor, 75: annular piston, 76: annular cylinder.

Claims

A squeeze table and a squeeze head are provided so as to be relatively movable back and forth along the molding path, and are provided on the squeeze table so as to be able to advance and retreat in the direction of the path around a model platen on which a model is mounted. The filling frame is advanced to a forward position in which the casting frame contact surface is located closer to the model than the surface of the model surface plate, and as the squeeze table advances, the casting frame is brought into contact with the lower filling frame at the casting frame delivery position. On the surface, the upper filling frame is sequentially superimposed on the casting frame, the molding sand is supplied into the superimposed lower filling frame, the casting frame and the upper filling frame, and the squeeze table or the squeeze head is supplied after the supply of the molding sand. The mold is formed by squeezing the molding sand by approaching each other, and after the squeeze is completed, before the squeeze table is retracted and the cast flask is returned to the flask delivery position, the lower filling frame is advanced to advance the model. Release from the mold Casting mold making method according to claim.

A squeeze table and a squeeze head, which are relatively moved forward and backward along the molding path by a driving device, are provided in the apparatus main body, and the molding flask delivery device for transferring the molding flask between the squeeze table and the squeeze table. Provided in the path, an upper filling frame is provided so as to be movable along the molding path between the casting frame delivery device and the squeeze head, and a lower filling frame surrounds the model platen on which the model is mounted. It provided capable on squeeze table reciprocating in the lower for advancing and retreating between a forward position in which the lower filling frame is molding flask abutment surface located on the model side of the plate surface and a retracted position coinciding with board of the model plate Provide a filling frame advance and retreat device, and provide a device for supplying molding sand into the lower filling frame, the casting frame and the upper filling frame located at the advanced position superimposed by the advancement of the squeeze table by the driving device, and after supplying the molding sand, The squeeze Tables or squeeze heads are moved closer to each other by the driving device to squeeze molding sand to form a mold, and after squeezing is completed, the squeeze table is retracted by the driving device to feed the flask to the flask feeding device. Wherein the lower frame is moved forward by a lower frame advance / retreat device to release the model from the mold before being transferred to the mold.

A squeeze table and a squeeze head, which are relatively moved forward and backward along the molding path by a driving device, are provided in the apparatus main body, and the molding flask delivery device for transferring the molding flask between the squeeze table and the squeeze table. Provided in the path, an upper filling frame is provided so as to be movable along the molding path between the casting frame delivery device and the squeeze head, and a lower filling frame surrounds the model platen on which the model is mounted. It provided capable on squeeze table reciprocating in the lower for advancing and retreating between a forward position in which the lower filling frame is molding flask abutment surface located on the model side of the plate surface and a retracted position coinciding with board of the model plate Provide a filling frame advance and retreat device, and provide a device for supplying molding sand into the lower filling frame, the casting frame and the upper filling frame located at the advanced position superimposed by the advancement of the squeeze table by the driving device, and after supplying the molding sand, The squeeze The squeeze table or the squeeze head is moved closer to each other by the driving device in a state where relative movement of the pad and the upper filling frame in the molding path direction is allowed to perform preliminary squeezing of molding sand on the back side, and the squeeze head and the upper squeeze head are squeezed. The squeeze table or the squeeze head is brought close to each other by the driving device until the lower filling frame is retracted to the retracted position while the relative movement in the path direction with the filling frame is restricted, and the molding sand is squeezed on the model surface side. After the model surface side squeezing is completed, the squeeze table or the squeeze head is brought close to each other by the driving device in a state where the relative movement of the squeeze head and the upper filling frame in the molding path direction is allowed, and the molding sand is squeezed on the back side. After the back side squeeze is completed, the squeeze table is retracted by the driving device to move the flask into the flask. Before passing the feed device, casting mold making system, characterized in that to release the model from the mold to the lower filling frame is moved forward by the avaiable frame advancing and retracting device.

A squeeze table and a squeeze head that are relatively moved up and down along a molding path by a driving device, and a master plate exchange device that detachably holds a master plate removably mounted on the squeeze table. And a casting flask delivery device for delivering a casting flask to and from a master plate placed on the squeeze table, and an upper pile frame movably mounted in the vertical direction and engaged with and disengaged from the upper surface of the casting flask. Provided on the main body, a lower filling frame is provided on the master plate so as to be able to advance and retreat in the vertical direction around a model platen on which the model is mounted, and the lower filling frame is in contact with the casting frame so that the casting frame contact surface matches the plate surface of the model platen. retracted position and provided avaiable frame advancing and retracting device for advancing and retracting between a forward position located model side of the board, the lower the filling frame advance and retreat avaiable frame of the master plate placed on the squeeze table And a device for supplying molding sand to the lower filling frame, the casting frame and the upper filling frame located at the forward position superimposed by the raising of the squeeze table by the driving device, and supplying the molding sand. Afterwards, the squeeze table or the squeeze head is moved closer to each other by the driving device in a state where the squeeze head and the upper filling frame are allowed to move in the vertical direction, and the molding sand is pre-squeezed on the back side, and the squeeze head and the squeeze head are squeezed. Squeezing the molding sand by bringing the squeeze table or squeeze head close to each other until the lower sill frame is lowered to the lowering position by the driving device in a state where the relative movement in the vertical direction with the upper sill frame is restricted, After the squeeze on the model side is completed, the squeeze table is allowed to move in a vertical direction between the squeeze head and the upper filling frame. The squeeze head is moved closer to each other by the driving device to squeeze the casting sand on the back side, and after the back side squeezing is completed, the squeeze table is lowered by the driving device to feed the flask to the flask feeding device. Before the delivery, the lower frame is raised by a lower frame advance / retreat device to release the model from the mold.

5. The mold molding apparatus according to claim 4, wherein a bottomed hole is provided in the lower frame in a downward direction, and a bar-shaped locking member that fits into the bottomed hole is provided in the master plate. A bottom portion of the lower abutment abuts on a head of the locking member to position the lower filling frame at a retreat position where a mold contact surface coincides with a plate surface of the model platen.

The mold molding apparatus according to any one of claims 3 to 5, wherein a pressure head is provided at a tip of a piston rod of a piston in which the squeeze head is slidably fitted in a cylinder provided on a head body in a molding path direction. A pressure control valve for discharging pressurized oil when the pressure in the chamber becomes equal to or higher than a set value in the chamber on the side opposite to the piston rod of the cylinder, and the chamber is squeezed when molding sand is squeezed on the model surface side. Blocking, when the pressure in the chamber becomes equal to or higher than a set value, the pressure control valve is actuated to retreat the pressurizing head until the lower filling frame retreats to the retracted position or the lowered position. .

7. The mold molding apparatus according to claim 2 , wherein the lower frame advance / retreat device is constituted by a plurality of cylinder devices, and supply and discharge of pressure oil to and from the plurality of cylinder devices are synchronized. A mold making apparatus characterized in that synchronization control is performed by using.

The mold forming apparatus according to any one of claims 2 to 6 , wherein the lower filling frame moving device is provided with an annular piston integrally provided below the squeeze table, and an annular cylinder fitted to the annular piston. A mold making apparatus characterized by comprising:

9. The mold molding apparatus according to claim 2 , wherein a spacer interposed between the outer periphery of the model platen and the inner periphery of the lower molding frame is fixed to the master plate. .

10. The casting mold abutment according to claim 9 , wherein the inner peripheral surface fitted to the outer peripheral surface of the spacer and the lower surface of the lower filling frame coincide with the surface of the model platen when the lower filling frame is located at the retracted position. A mold forming apparatus, wherein a liner having a surface formed thereon is fixed to an inner periphery of the lower filling frame.