JP3547733B2

JP3547733B2 - Mold molding method and apparatus therefor

Info

Publication number: JP3547733B2
Application number: JP2002083061A
Authority: JP
Inventors: 諭三金平
Original assignee: Metal Engineering KK
Current assignee: Metal Engineering KK
Priority date: 2002-03-25
Filing date: 2002-03-25
Publication date: 2004-07-28
Anticipated expiration: 2022-03-25
Also published as: JP2003285139A

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】
従来、模型が取付けられた模型定盤をスクイズテーブル上に設け、該模型定盤上に鋳枠及び上盛枠を重合して重合鋳枠を構成し、鋳物砂を蓄えた計量ホッパーを前記重合鋳枠と対向する位置に移動して鋳物砂を重合鋳枠内に投入し、鋳物砂の供給後にスクイズヘッドを重合鋳枠と対向する位置に割出し移動し、重合鋳枠の上端より盛り上がった鋳物砂をスクイズヘッドの割出し移動に連動して掻き取り、その後にスクイズテーブルとスクイズヘッドと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ていた。
【０００３】
【発明が解決しようとする課題】
上記従来の鋳型造型においては、重合鋳枠の上端より盛り上がって掻き取られた鋳物砂は、使用されることなく、砂再生装置に搬送されていたので、鋳物砂の消費量が多くなり、砂の再生コストが高くなる不具合があった。また、掻き取った鋳物砂を砂再生装置に搬送する搬送装置が必要となっていた。
【０００４】
本発明は、かかる従来の不具合を解消するためになされたもので、重合鋳枠の上端より盛り上がって掻き取られた鋳物砂を次の鋳型の造型に使用できるようにすることである。
【０００５】
【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取り囲んで下盛枠を上下動可能に設け、鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に前記下盛枠を位置した状態で肌砂を前記下盛枠内に投入し、鋳枠及び上盛枠を前記下盛枠上に重合して重合鋳枠を構成し、該重合鋳枠内に裏砂を供給し、鋳物砂の供給後に前記スクイズテーブルとスクイズヘッドとを互いに接近させて前記肌砂及び裏砂をスクイズして鋳型を造型することである。
【０００６】
請求項２に係る発明の構成上の特徴は、スクイズテーブル上に設けられ模型が取付けられた模型定盤を取り囲んで下盛枠を上下動可能に設け、該下盛枠上に鋳枠及び上盛枠を重合して重合鋳枠を構成し、鋳物砂を蓄えた計量ホッパーを前記重合鋳枠と対向する位置に移動して鋳物砂を前記重合鋳枠内に投入し、鋳物砂の供給後にスクイズヘッドを前記重合鋳枠と対向する位置に移動し、前記スクイズテーブルと前記スクイズヘッドとを互いに接近させて前記鋳物砂をスクイズして鋳型を造型する方法において、前記スクイズヘッドが前記スクイズテーブルと対向するために水平方向に移動する動きに連動して前記重合鋳枠の上端より盛り上がった鋳物砂を掻き取って掻き砂ホッパーに蓄え、該掻き取った砂を鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に位置した下盛枠内に掻き砂ホッパーから投入し、掻き取った砂を次の鋳型の造型に鋳物砂の一部として使用することである。
【０００７】
請求項３に係る発明の構成上の特徴は、請求項２に記載の鋳型造型方法において、前記掻き砂ホッパーに重量計を取り付けて前記掻き取った砂の重量を測定し、不足分を前記計量ホッパーに蓄えることである。
【０００８】
請求項４に係る発明の構成上の特徴は、請求項２又は３に記載の鋳型造型方法において、前記掻き取った鋳物砂を前記掻き砂ホッパーから前記鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に位置した下盛枠内に投入するときに、解砕器によって解し次の鋳型の造型に肌砂として使用することである。
【０００９】
請求項５に係る発明の構成上の特徴は、請求項２乃至４のいずれかに記載の鋳型造型方法において、前記スクイズテーブルの上面に着脱されるキャリアプレートに模型が取付けられた模型定盤を取り囲んで下盛枠を上下動可能に設け、鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に前記下盛枠を上昇させた状態で前記キャリアプレートを前記掻き砂ホッパーの下方に移動し、前記掻き取った鋳物砂を次の鋳型造型の鋳物砂の一部として前記下盛枠内に投入し、その後に前記キャリアプレートを前記スクイズテーブル上に戻すことである。
【００１０】
請求項６に係る発明の構成上の特徴は、スクイズテーブル上に設けられ模型が取付けられた模型定盤を取り囲んで下盛枠を上下動可能に設け、鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に前記下盛枠を位置した状態で、該下盛枠上に鋳枠及び上盛枠を重合して重合鋳枠を構成し、鋳物砂を蓄えた計量ホッパーを前記重合鋳枠と対向する位置に移動して該鋳物砂を前記重合鋳枠内に投入し、鋳物砂の供給後にスクイズヘッドを前記重合鋳枠と対向する位置に移動し、前記鋳枠の下面が前記模型定盤の盤面と一致するように前記スクイズテーブルを前記重合鋳枠に対して相対的に上昇させるとともに、前記スクイズテーブルと前記スクイズヘッドとを互いに接近させて前記鋳物砂をスクイズして鋳型を造型する方法において、前記造型された鋳型の前記鋳枠上端から前記背面側に突出した砂付き量を計測し、前記重合鋳枠に投入された鋳物砂を掻き取る前に、前記砂付き量に応じて設定した突出量だけ前記鋳枠当接面が模型定盤の盤面よりせり出した調整位置に固定することである。
【００１１】
請求項７に係る発明の構成上の特徴は、装置本体に設けられ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及びスクイズヘッドと、模型が取付けられた模型定盤を取り囲んで上下動可能にスクイズテーブル上に設けられた下盛枠と、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せり出した上昇位置との間で昇降させる下盛枠昇降装置と、前記上昇位置に位置する下盛枠上に鋳枠及び上盛枠を重合して重合鋳枠を構成する鋳枠重合装置と、鋳物砂を蓄えた計量ホッパーと前記スクイズヘッドとを前記重合鋳枠と対向する位置に交互に割出し位置決めする割出し装置と、前記計量ホッパーから前記重合鋳枠に投入された鋳物砂の前記重合鋳枠の上端より盛り上がった鋳物砂を掻き取る手段と、前記重合鋳枠と並んで前記装置本体に設けられ前記掻き取った鋳物砂を収容する掻き砂ホッパーとを設けたことである。
【００１２】
【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、模型が取付けられた模型定盤を取り囲んで下盛枠を上下動可能に設け、鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に位置する下盛枠内に肌砂を投入し、鋳枠及び上盛枠を下盛枠上に重合して重合鋳枠を構成し、該重合鋳枠内に裏砂を供給し、その後にスクイズテーブルとスクイズヘッドとを互いに接近させて肌砂及び裏砂をスクイズして鋳型を造型する。これにより、肌砂を使用する場合に、鋳枠をセットした後に模型に肌砂を被せていた従来方法に比して、次の鋳型の造型に用いる鋳枠を準備する間に肌砂を下盛枠内に準備することができて、肌砂を被せるための時間を別途必要とせず、鋳型の造型時間を短縮することができる。
【００１３】
上記のように構成した請求項２に係る発明においては、スクイズテーブル上に設けられ模型が取付けられた模型定盤を取り囲んで下盛枠を上下動可能に設け、該下盛枠上に鋳枠及び上盛枠を重合して重合鋳枠を構成し、鋳物砂を蓄えた計量ホッパーから鋳物砂が重合鋳枠内に投入された後に、スクイズヘッドがスクイズテーブルと対向するために水平方向に移動する動きに連動して、重合鋳枠の上端より盛り上がった鋳物砂を掻き取って掻き砂ホッパーに蓄え、該掻き取った砂を鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に位置する下盛枠内に掻き砂ホッパーから投入するようにしたので、掻き取った鋳物砂を次の鋳型の造型に鋳物砂の一部として使用することができ、砂の再生コストを低減し、掻き砂の移送装置をなくして設備コストを下げることができる。
【００１４】
上記のように構成した請求項３に係る発明においては、掻き砂ホッパーに重量計を取り付けて掻き取った砂の重量を測定し、不足分を計量ホッパーに蓄えるようにしたので、掻き取った砂を次ぎの鋳型の造型に使用できるとともに、計量ホッパーから重合鋳枠に適切な量の鋳物砂を投入することができる。
【００１５】
上記のように構成した請求項４に係る発明においては、掻き取った鋳物砂を解砕器によって解して掻き砂ホッパーから重合鋳枠内に投入するので、掻き取った砂を次の鋳型の造型に肌砂として使用し、鋳肌の滑らかな鋳物を鋳造することができる。
【００１６】
上記のように構成した請求項５に係る発明においては、スクイズテーブルの上面に着脱されるキャリアプレートに模型が取付けられた模型定盤を取り囲んで下盛枠を上下動可能に設け、鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に下盛枠を上昇させた状態でキャリアプレートを掻き砂ホッパーの下方に移動し、掻き取った鋳物砂を次の鋳型造型の鋳物砂の一部として下盛枠内に投入した後にキャリアプレートをスクイズテーブル上に戻すようにしたので、次の造型に用いる鋳枠を準備中に、掻き取った鋳物砂を下盛枠内に投入して次の鋳型の造型に鋳物砂の一部として使用することができる。
【００１７】
上記のように構成した請求項６に係る発明においては、スクイズテーブル上に設けられ模型が取付けられた模型定盤を取り囲んで下盛枠を上下動可能に設け、鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に下盛枠を位置した状態で、該下盛枠上に鋳枠及び上盛枠を重合して重合鋳枠を構成し、鋳物砂を蓄えた計量ホッパーを重合鋳枠と対向する位置に移動して該鋳物砂を重合鋳枠内に投入し、鋳物砂の供給後にスクイズヘッドを重合鋳枠と対向する位置に移動し、鋳枠の下面が模型定盤の盤面と一致するようにスクイズテーブルを重合鋳枠に対して相対的に上昇させるとともに、スクイズテーブルとスクイズヘッドとを互いに相対的に接近させて鋳物砂をスクイズして鋳型を造型し、該鋳型の鋳枠上端から背面側に突出した砂付き量を計測し、該砂付き量に応じて設定した突出量だけ鋳枠当接面が模型定盤の盤面よりせり出す調整位置に下盛枠を固定するようにしたので、砂付き量を最適に制御し、別途設備を用意して過大な砂付きを切除する必要がない。
【００１８】
上記のように構成した請求項７に係る発明においては、下盛枠を鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に位置し、該下盛枠上に鋳枠重合装置により鋳枠及び上盛枠を重合して重合鋳枠を構成し、鋳物砂を蓄えた計量ホッパーを重合鋳枠に対向させて鋳物砂を重合鋳枠内に投入した後に、スクイズヘッドをスクイズテーブルと対向させるために水平方向に移動させる動きに連動して、重合鋳枠の上端より盛り上がった鋳物砂を掻き取って掻き砂ホッパーに蓄え、該掻き取った砂を鋳枠当接面が模型定盤の盤面よりせり出した上昇位置に位置する下盛枠内に掻き砂ホッパーから投入するようにしたので、掻き取った鋳物砂を次の鋳型の造型に鋳物砂の一部として使用することができ、砂の再生コストを低減し、掻き砂の移送装置をなくした低コストの鋳型造型装置を提供することができる。
【００１９】
【実施の形態】
以下本発明の第１実施形態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により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、直方体のキャリアプレート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。図３に示すように掻き砂ホッパー４６から肌砂３８ｂを投入された次に使用されるキャリアプレート６は、ローラコンベア５によりスクイズテーブル１上方の交換位置に搬送され、図略の停止装置によって交換位置に位置決めされ、シリンダ装置３により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。
【００２０】
キャリアプレート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を取り囲んで上下方向に昇降可能に装架されている。キャリアプレート６の下方フランジ部６ａの４隅上面と下盛枠１０の下面との間には、圧縮スプリング１４が介装され、下盛枠１０は圧縮スプリング１４のばね力により上方に付勢されている。４本のロッド１５が下盛枠１０の下面から圧縮スプリング１４を貫通して下方に突設され、ロッド１５の下端に設けられた大径部１５ａが下方フランジ部６ａに設けられた段付き穴６ｂの肩部に当接することにより下盛枠１０が、鋳枠当接面１０ａが模型定盤９の盤面９ａよりせり出す上昇位置に位置される。下盛枠１０が圧縮スプリング１４のばね力に抗して後退され、下面に突設された停止部１０ｂが下方フランジ部６ａの上面に当接すると鋳枠当接面１０ａが模型定盤９の盤面９ａと一致する。圧縮スプリング１４、ロッド１５等によって下盛枠１０を鋳枠当接面１０ａが模型定盤９の盤面９ａと一致する後退位置と盤面９ａよりせり出した上昇位置との間で昇降させる下盛枠昇降装置１７が構成されている。
【００２１】
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の両側下面をキャリアプレート交換位置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る。スクイズテーブル１がシリンダ装置３によって上昇されると、キャリアプレート６がスクイズテーブル１上に載置され、鋳枠３１がローラコンベア３０から下盛枠１０の鋳枠当接面１０ａ上に受け渡される。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に設けられたシリンダ装置のピストンロッドに４隅で連結されて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、上盛枠３５が鋳枠３１上に重合される。スクイズテーブル１を上昇させるシリンダ装置３、鋳枠を支持するローラコンベア３０及び上盛枠支持部材などにより、上昇位置に位置する下盛枠１０上に鋳枠３１及び上盛枠３５を重合して重合鋳枠３７を構成する鋳枠重合装置３９が構成されている。
【００２２】
シリンダ装置３はスクイズテーブル１を図４に示す鋳物砂投入位置に停止させ、この位置で鋳物砂３８が計量ホッパー４０から重合鋳枠３７内に投入される。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により鋳物砂投入位置とスクイズ位置に割出し位置決めされる。計量ホッパー４０はシャトル４１に取付けられ、シャトル４１が鋳物砂投入位置に割出されたとき、重合鋳枠３７に計量ホッパー４０が対向し、計量された鋳物砂３８を重合鋳枠３７に充填する。計量ホッパー４０の下端部には、図略の回動装置により水平軸線回りに夫々回動される複数枚の底板からなるシャッター４３が設けられ、底板が水平状態に回動されて鋳物砂３８を蓄え、垂直方向に回動されて鋳物砂３８を重合鋳枠３７に投入する。シャトル４１にはスクイズヘッド４５が計量ホッパー４０と並んで装架され、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。シャトル４１及びシリンダ装置４２によって鋳物砂３８を蓄えた計量ホッパー４０とスクイズヘッド４５とを重合鋳枠３７と対向する位置に交互に割出し位置決めする割出し装置３６が構成されている。
【００２３】
４６は重量計４９を介して装置本体２に取り付けられた掻き砂ホッパーで、鋳物砂投入位置に停止されたスクイズテーブル１上に載置された重合鋳枠３７と並列し、上盛枠１０の上面との間に隙間ができないようにブリッジ板４６ａが掻き砂ホッパー４６の上面から上盛枠１０に向かって突出されている。これにより、計量ホッパー４０から重合鋳枠３７に投入され、重合鋳枠３７の上端より盛り上がった鋳物砂３８は、スクイズヘッド４５がスクイズテーブル１と対向するシャトル４１のスクイズ位置への移動に連動して計量ホッパー４０の内側下端面によって掻き取られ、掻き砂ホッパー４６に入れられる。掻き砂ホッパー４６下方の肌砂供給位置には、次に使用されるキャリアプレート６がローラコンベア５上で図略の停止装置により位置決めされ、掻き取られた砂が掻き砂ホッパー４６から次に使用されるキャリアプレート６に嵌合され鋳枠当接面１０ａが模型定盤９の盤面９ａより上昇した上昇位置に位置された下盛枠１０内に投入される。計量ホッパー４０から重合鋳枠３７に投入された鋳物砂３８の重合鋳枠３７の上端より盛り上がった鋳物砂３８を掻き取る手段は、スクイズヘッド４５がスクイズテーブル１と対向するシャトル４１のスクイズ位置への移動に連動して計量ホッパー４０の内側下端面によって掻き取るものに限られるものはでなく、シャトル４１に掻きプレートを設け、シャトル４１のスクイズ位置への移動に連動して重合鋳枠３７の上端より盛り上がった鋳物砂３８を掻き取って掻き砂３８ａとして掻き砂ホッパー４６に掻き入れるようにしてもよい。
【００２４】
掻き砂ホッパー４６の中央部には、図略の回動装置により水平軸線回りに夫々回動される複数枚の底板からなるシャッター４７が設けられ、底板が水平状態に回動されて掻き砂３８ａを蓄え、垂直方向に回動されて掻き砂３８ａを落下させる。掻き砂ホッパー４６には、シャッター４７の下方に解砕器４８が設けられ、シャッター４７が開かれて落下する鋳物砂３８を打ち砕いて解し、肌砂供給位置に位置決めされたキャリアプレート６に嵌合する下盛枠１０内に肌砂３８ｂとして供給する。解砕器４８は、モータによって回転駆動される円板を水平方向に複数個並接し、各円板に２本の水平ロッドを回転中心から直径方向両側に偏心した位置で水平方向に突設し、円盤の回転により水平ロッドが偏心回転して落下する鋳物砂３８を叩いて解すものである。
【００２５】
シャトル４１がスクイズ位置に割出し位置決めされたとき、計量ホッパー４０は、鋳物砂３８を搬送するベルトコンベア５０の端部下方の充填位置に位置決めされ、計量された鋳物砂３８が充填される。ベルトコンベア５０は一定幅の鋳物砂３８を一定厚さで搬送するので、ベルトコンベア５０が掛けられたベルト車５１の回転角度を回転角度計５２により計測してベルトコンベア５０を所望距離だけ移動させることによって計量した鋳物砂３８を計量ホッパー４０に供給している。
【００２６】
スクイズヘッド４５を装架するヘッド本体５５にはシリンダ５６が垂直に設けられ、シリンダ５６に摺動可能に嵌合されたピストン５７の下方に突出したピストンロッド先端にスクイズヘッド４５が固定されている。スクイズヘッド４５は重合鋳枠３７の内側に嵌入し、重合鋳枠３７に投入された鋳物砂３８をスクイズする。シリンダ５６の上室は切換弁により圧力源又はレリーフ弁を介してタンクに選択的に接続されるようになっている。ヘッド本体４６の４隅にはストップ部材５１が垂直に設けられ、上盛枠３５の４隅に当接して、重合鋳枠３７の上昇を規制する。
【００２７】
上記のように構成した実施形態の作動を説明する。造型が完了し、鋳型５８を造型された鋳枠３１が鋳枠受渡位置から搬出され、空の鋳枠３１が搬入される間に（図１，３）、先の造型で掻き砂ホパー４６に掻き入れられた掻き砂３８ａの量が重量計４９により計量され、次の造型に必要な鋳物砂３８から掻き砂３８ａの量を引いた鋳物砂３８が、ベルト車５１の回転量を回転角度計５２により計測することによりベルトコンベア５０を必要距離だけ移動させて計量ホッパー４０に充填される。掻き砂ホッパー４６の下方の肌砂供給位置に、下盛枠１０を上昇位置に位置した次に使用されるキャリアプレート６がローラコンベア５により搬送されて図略の停止装置により位置決めされると、解砕器４８が回転駆動された後、シャッター４７が開かれて掻き砂３８ａが落下され、掻き砂３８ａが落下の途中で解砕器４８により打ち砕かれて解され、上昇位置に位置する下盛枠１０内に模型８を覆うように肌砂３８ｂとして投入される。この細かく解された肌砂３８ｂによって模型８を覆って鋳型５８が造型されるので、鋳肌が滑らかな鋳物を鋳造することができる。このとき、下盛枠１０は圧縮スプリングのばね力により上方に付勢され、ロッド１５の大径部１５ａがキャリアプレート６の下方フランジ部６ａに穿設された段付き穴６ｂの肩部に当接し、鋳枠当接面１０ａが模型定盤９の盤面９ａよりせり出す上昇位置に位置している。鋳型５８から開離してローラコンベア５上に載置されたキャリアプレート６はローラコンベア５により交換位置から搬出され、下盛枠１０内に肌砂が投入された次に使用されるキャリアプレート６が肌砂供給位置から交換位置にローラコンベア５によって搬送されて位置決めされる。
【００２８】
計量ホッパー４０がスクイズテーブル１と対向するように、シャトル４１がシリンダ装置４２により鋳物砂投入位置に割出し位置決めされる。そして、スクイズテーブル１は、シリンダ装置３により上昇されて下盛枠１０内に肌砂３８ｂを投入されたキャリアプレート６をローラコンベア５から交換位置で受取り、更に上昇されて鋳枠３１を鋳枠受渡位置でローラコンベア３０から下盛枠１０の鋳枠当接面１０ａ上に受取る。上盛枠３５が鋳枠３１上に載置されて重合鋳枠３７が構成された後に、スクイズテーブル１はシリンダ装置３への圧油の給排がブロックされて鋳物砂投入位置に一旦停止される（図４）。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計量ホッパー４０のシャッター４３が解放され、計量ホッパー４０内に蓄えられた計量された鋳物砂３８が裏砂として重合鋳枠３７内に投入される（図５）。
【００２９】
重合鋳枠３７内に鋳物砂３８の投入が完了すると、スクイズヘッド４５をスクイズテーブル１と対向させるために、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る。計量ホッパー４０から重合鋳枠３７に投入され、重合鋳枠３７の上端より盛り上がった鋳物砂３８は、シャトル４１のスクイズ位置への移動に連動して計量ホッパー４０の内側下端面によって掻き取られ、掻き砂ホッパー４６に掻き入れられる（図６）。
【００３０】
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、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ると、スクイズテーブル１がシリンダ装置３によりさらに上昇され、重合鋳枠３７に充填された鋳物砂３８が上昇されて、下降端に位置するスクイズヘッド４５に当接して背面予備スクイズされる。このとき、シリンダ５６の上室は、レリーフ弁を介してタンクに連通されているので、スクイズヘッド４５は重合鋳枠３７の上昇に連れて鋳物砂３８をレリーフ弁のレリーフ圧に応じた圧力で背面予備スクイズしながら後退する。上盛枠３５の上面がヘッド本体４６の４隅に設けられたストップ部材５１に当接すると、重合鋳枠３７の上昇が規制され、スクイズテーブル１の上昇に連れて模型定盤９が固定されたキャリアプレート１が圧縮スプリング１４のばね力に抗して重合鋳枠３７に対して上昇され、鋳物砂３８がレリーフ弁のレリーフ圧に応じた圧力で模型側スクイズされる。鋳枠当接面１０ａが模型定盤９の盤面９ａと一致するまで下盛枠１０が圧縮スプリング１４のばね力に抗して相対的に後退され、下盛枠１０の停止部１０ｂがキャリアプレート６の下方フランジ部６ａの上面に当接すると、スクイズテーブル１の上昇が規制され、シリンダ装置３の下室内の圧力が上昇する。この下室内の圧力上昇が圧力センサにより検出されると、シリンダ５６の上室が切換弁により圧力源に接続されてピストン５７が所定圧力で押圧され、鋳物砂３８がスクイズヘッド４５により背面側スクイズされる（図７）。
【００３１】
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。下盛枠１０が圧縮スプリング１４のばね力によりキャリアプレート６に対して上昇位置に上昇され、鋳枠当接面１０ａに載置された鋳枠３１もキャリアプレート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５８から離型する（図８）。
【００３２】
スクイズテーブル１はシリンダ装置３によって更に下降され、鋳枠３１がローラコンベア３０上に載置されて下盛枠１０から離脱し、キャリアプレート６がローラコンベア５上に受け渡されてスクイズテーブル１上面から開離し、その後にスクイズテーブル１は下降端に停止する。スクイズヘッド４５は、切換弁の切換えによりピストン５７が下降されて下降端に戻される（図９）。ローラコンベア３０上に載置された鋳枠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、ローラコンベア５上に載置されたキャリアプレート６はローラコンベア５により交換位置から搬出され、以下同様に造型サイクルが繰り返される。
【００３３】
造型された鋳型５８の鋳枠３１上端から背面側に突出した砂付き量ｔ（図９参照）は、バラツキが生じたり、大き過ぎると切取り装置を別途設けて後工程で切除する必要がある。この砂付き量ｔは、計量ホッパー４０から重合鋳枠３７に投入され上端から盛り上った部分を掻き取られた重合鋳枠３７内の鋳物砂３８の量によって異なるので、第２実施形態においては、重合鋳枠３７内の鋳物砂３８の量を先に造型した鋳型５８の砂付き量ｔに基づいて設定し、砂付き量を最適に制御している。このため、鋳型５８を造型された鋳枠３１がローラコンベア３０上に載置されると、鋳型５８の鋳枠３１上端から背面側に突出している砂付き量ｔが寸法測定装置６０によって測定され、計量ホッパー４０から重合鋳枠３７に投入された鋳物砂３８の重合鋳枠３７の上端から盛り上った部分を掻き取る前に、鋳枠当接面１０ａが模型定盤９の盤面９ａよりせり出す突出量がこの砂付き量ｔに応じて設定される。即ち、図１０に示すように、鋳物砂投入位置には、シリンダ装置６１のピストンロッド６２に４隅を連結されて下降端位置に保持された上盛枠３５が位置し、スクイズテーブル１がキャリアプレート６をローラコンベア５から受取って鋳物砂投入位置まで上昇すると、下盛枠１０上に載置された鋳枠３１が上盛枠３５に当接して重合鋳枠３７を構成する。
【００３４】
先に造型された鋳型５８の砂付き量ｔが大きいことは、重合鋳枠３７内の鋳物砂３８の量が多いことであるので、スクイズテーブル１を上昇させて砂付き量ｔに応じた調整量だけ模型定盤９の盤面９ａを下盛枠１０に対して上昇させる。盤面９ａを下盛枠１０に対して上昇させる調整量は、模型８毎に砂付き量ｔに対応して制御装置６４のメモリに登録されている。測定された鋳型５８の砂付き量ｔに対する調整量がメモリから読み出され、位置検出装置６３により検出されるスクイズテーブル１の位置が、鋳物砂投入位置でのスクイズテーブル１の停止位置に調整量を加算した調整位置と等しくなるまでスクイズテーブル１はシリンダ装置３により上昇されて停止される。
【００３５】
スクイズテーブル１が調整位置まで上昇された後に、ホッパー４０から鋳物砂３８が重合鋳枠３７内に投入されると、スクイズヘッド４５をスクイズテーブル１と対向させるために、シャトル３７がシリンダ装置４２によりスクイズ位置に割出される。計量ホッパー４０から重合鋳枠３７に投入され、重合鋳枠３７の上端より盛り上がった鋳物砂３８は、シャトル４１のスクイズ位置への移動に連動して計量ホッパー４０の内側下端面によって掻き取られ、掻き砂ホッパー４６に掻き入れられる。シャトル４１がスクイズ位置に割出されると、シリンダ装置６１への油圧の供給が遮断されピストンロッド６２延いては上盛枠３５が自由に上下動動可能な状態になる。スクイズテーブル１がシリンダ装置３によりさらに上昇され、前述と同様に重合鋳枠３７に充填された鋳物砂３８がスクイズされる。スクイズが完了して、スクイズテーブル１の下降によりローラコンベア５上に載置されたキャリアプレート６は、ローラコンベア５により交換位置から搬出される。
【００３６】
上記実施形態では、下盛枠昇降装置１７として、下盛枠１０とキャリアプレート６との間に圧縮スプリング１４を介在しているが、スクイズテーブル１の４隅にシリンダ装置を設け、このシリンダ装置のピストンロッドの昇降によって下盛枠１０を上昇位置と後退位置との間で移動させるようにしてもよい。
【００３７】
また、上記実施形態では、模型が取り付けられた模型定盤を取り囲んで上下動可能に下盛枠をスクイズテーブル上に設けるために、下盛枠をキャリアプレートに模型定盤を取り囲んで上下動可能に設け、該キャリアプレートをスクイズテーブル上に着脱するようにしているが、模型定盤をスクイズテーブル上に固定し、下盛枠をスクイズテーブルに模型定盤を取り囲んで上下動可能に装架してもよい。
【００３８】
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。
【図面の簡単な説明】
【図1】本実施形態に係る鋳型造型装置を示す図。
【図２】下盛枠を装架したキャリアプレートを示す図。
【図３】搬送コンベアから鋳物砂を計量ホッパーに投入し、掻き砂ホッパーから肌砂を下盛枠に投入した状態を示す図。
【図４】鋳物砂投入位置に位置する重合鋳枠に計量ホッパーが対向状態を示す図。
【図５】鋳物砂投入位置に位置する重合鋳枠に計量ホッパーから鋳物砂を投入した状態を示す図。
【図６】スクイズヘッドが重合鋳枠と対向する動きに連動して重合鋳枠上端より盛り上った鋳物砂を掻き砂ホッパーに掻き入れた状態を示す図。
【図７】スクイズ状態を示す図。
【図８】離型状態を示す図。
【図９】１サイクル完了時の状態を示す図。
【図１０】第２の実施形態を示す図。
【符号の説明】
１…スクイズテーブル、２…装置本体、３，４２，６５…シリンダ装置、６…キャリアプレート、５，３０…ローラコンベア、８…模型、９…模型定盤、９ａ…盤面、１０…下盛枠、１０ａ…鋳枠当接面、１７…下盛枠昇降装置、３１…鋳枠、３５…上盛枠、３７…重合鋳枠、３９…鋳枠重合装置、４０…計量ホッパー、４１…シャトル、４５…スクイズヘッド、４６…掻き砂ホッパー、４８…解砕器、４９…重量計、５６…シリンダ、５７…ピストン、５０…ベルトコンベア、５８…鋳型、６０…寸法測定装置、シリンダ装置６１。[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]
Conventionally, a model surface plate on which a model is mounted is provided on a squeeze table, a casting frame and an upper filling frame are superimposed on the model surface plate to form a superimposed molding frame, and a weighing hopper storing casting sand is superposed. Moved to the position facing the casting flask and poured the molding sand into the overlapped casting flask, indexed and moved the squeeze head to the position facing the polymerization casting flask after the supply of the casting sand, and swelled from the upper end of the polymerization casting flask The casting sand was scraped off in conjunction with the indexing movement of the squeeze head, and then the squeeze table and the squeeze head were brought close to each other to squeeze the casting sand to form a mold.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional mold making, the molding sand that has been raised and scraped off from the upper end of the overlapped casting flask has been conveyed to the sand recycling device without being used, so that the consumption of the molding sand increases, There was a problem that the reproduction cost was high. Further, a conveying device for conveying the scraped foundry sand to a sand recycling device has been required.
[0004]
The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to make it possible to use molding sand that has been raised and scraped off from the upper end of a polymerization flask for molding a next mold.
[0005]
[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. A lower filling frame is provided so as to be able to move up and down around the model platen, and the skin sand is placed in the lower filling frame in a state where the casting frame abutment surface is located at an elevated position protruding from the plate surface of the model platen. , The casting frame and the upper filling frame are superimposed on the lower filling frame to form a polymerization casting frame, back sand is supplied into the polymerization casting frame, and the squeeze table and the squeeze head are supplied after the molding sand is supplied. And squeezing the skin sand and the back sand to form a mold.
[0006]
The structural feature of the invention according to claim 2 is that a lower filling frame is provided so as to be movable up and down around a model base plate provided on a squeeze table and having a model attached thereto, and a casting frame and an upper The filling frame is superimposed to form a polymerized casting flask, the measuring hopper storing the molding sand is moved to a position facing the polymerized casting frame, and the molding sand is put into the polymerized casting flask, and after the molding sand is supplied. In a method of moving a squeeze head to a position facing the overlapped casting flask, bringing the squeeze table and the squeeze head close to each other, and squeezing the molding sand to form a mold, the squeeze head and the squeeze table In conjunction with the movement to move in the horizontal direction to oppose, the molding sand raised from the upper end of the overlapped casting flask is scraped off and stored in a scraping sand hopper, and the scraped sand is brought into contact with the casting flask contact surface of the model platen. From the board Ri elevated introduced from scraping the sand hopper avaiable frame within which is located at a position out is to use as part of the molding sand scraped sand molding of the next mold.
[0007]
A structural feature of the invention according to claim 3 is that in the mold molding method according to claim 2, a weighing machine is attached to the scraping sand hopper, the weight of the scraped sand is measured, and the shortage is measured. To store in the hopper.
[0008]
The structural feature of the invention according to claim 4 is that, in the mold molding method according to claim 2 or 3, the molding sand contacted with the scraped sand from the scraping sand hopper is a surface of a model surface plate. When the material is put into the lower sill that is located at the raised position, it is unraveled by a crusher and used as skin sand in the molding of the next mold.
[0009]
A structural feature of the invention according to claim 5 is that, in the mold molding method according to any one of claims 2 to 4, a model platen on which a model is mounted on a carrier plate that is attached to and detached from the upper surface of the squeeze table. Surrounding the lower filling frame is provided so as to be vertically movable, and the carrier plate is placed below the scraping sand hopper while the lower filling frame is raised to a raised position where the casting frame contact surface protrudes from the surface of the model surface plate. Then, the scraped molding sand is put into the lower filling frame as a part of the molding sand for the next molding, and then the carrier plate is returned to the squeeze table.
[0010]
The structural feature of the invention according to claim 6 is that a lower filling frame is provided so as to be able to move up and down around a model base plate provided on a squeeze table and having a model attached thereto, and a casting frame abutment surface of the model base plate. With the lower filling frame positioned at the raised position protruding from the panel surface, a casting frame and an upper filling frame are superimposed on the lower filling frame to form a polymerization casting frame, and the measuring hopper storing casting sand is subjected to the polymerization. Move to a position facing the casting flask, throw the casting sand into the overlapped casting flask, move the squeeze head to a position facing the overlapped casting flask after the supply of the casting sand, the lower surface of the casting flask is the The squeeze table is raised relative to the overlapped casting frame so as to coincide with the surface of the model platen, and the squeeze table and the squeeze head are brought close to each other to squeeze the casting sand to form a mold. In the method of molding, the molding Measure the amount of sand protruding from the upper end of the casting flask to the back side of the cast mold, before scraping the molding sand put into the overlapped casting flask, only the amount of projection set according to the amount of sand The casting frame contact surface is fixed at an adjustment position protruding from the surface of the model surface plate.
[0011]
A structural feature of the invention according to claim 7 is that a squeeze table and a squeeze head which are provided in the apparatus main body and are relatively moved forward and backward along a molding path by a driving device, and a model on which the model is mounted. A lower filling frame provided on a squeeze table so as to be able to move up and down around the surface plate, and a raised position in which the lower filling frame is protruded from the plate surface with a retreat position where a casting frame contact surface coincides with the surface of the model surface plate. A lower filling frame elevating device that moves up and down between the position, a lowering frame positioned on the lower filling frame located at the raising position, a lowering frame and an upper filling frame, and a lowering frame polymerization device that configures a lowering molding frame; An indexing device for alternately indexing and positioning the stored weighing hopper and the squeeze head at a position opposed to the overlapped casting flask, and the overlapped casting flask of molding sand put into the overlapped casting flask from the measuring hopper. Raised from the top Means for scraping the molding sand is that of providing a scraping sand hopper accommodates the scraped sand provided in the apparatus main body along with the polymerization drag flask.
[0012]
[Action and Effect of the Invention]
In the invention according to claim 1 configured as described above, the lower filling frame is provided so as to be able to move up and down around the model surface plate on which the model is mounted, and the casting frame contact surface protrudes from the surface of the model surface plate. Filling the sand sand into the lower filling frame located at the ascending position, polymerizing the casting frame and the upper filling frame on the lower filling frame to form a polymerized casting frame, and supplying back sand into the polymerized casting frame, Thereafter, the squeeze table and the squeeze head are brought close to each other to squeeze the skin sand and the back sand to form a mold. In this way, when using sand, compared to the conventional method in which the casting sand was set on the model after setting the casting sand, the sand was lowered during the preparation of the casting flask to be used for molding the next mold. Since it can be prepared in the filling frame, no extra time is required to cover the sand and the molding time of the mold can be reduced.
[0013]
In the invention according to claim 2 configured as described above, a lower filling frame is provided so as to be able to move up and down around a model surface plate provided on a squeeze table and mounted with a model, and a casting frame is provided on the lower filling frame. After the casting sand is put into the overlapping casting frame from the weighing hopper that stores the casting sand, the squeeze head moves horizontally to face the squeeze table. In conjunction with the movement, the molding sand raised from the upper end of the overlapped casting flask is scraped and stored in a scraping sand hopper, and the scraped sand is moved to a raised position where the casting frame contact surface protrudes from the surface of the model surface plate. Since the scraping sand hopper was put into the lower filling frame located, the scraped molding sand can be used as part of the molding sand in the molding of the next mold, reducing the sand regeneration cost, Equipment without scraping sand transfer device It is possible to lower the strike.
[0014]
In the invention according to claim 3 configured as described above, the weight of the scraped sand is measured by attaching a weighing scale to the scraping sand hopper, and the shortage is stored in the weighing hopper. Can be used for the molding of the next mold, and an appropriate amount of molding sand can be put into the polymerization flask from the measuring hopper.
[0015]
In the invention according to claim 4 configured as described above, since the scraped molding sand is disentangled by the crusher and put into the polymerization casting flask from the scraping sand hopper, the scraped sand is used for the next mold. It can be used as a sand for molding and cast a casting with a smooth casting surface.
[0016]
In the invention according to claim 5 configured as described above, a lower filling frame is provided movably up and down around a model platen on which a model is mounted on a carrier plate detachably mounted on the upper surface of the squeeze table. The carrier plate is moved under the sand hopper with the lower filling frame raised to the raised position where the contact surface protrudes from the surface of the model surface plate, and the scraped molding sand is removed from the molding sand of the next mold. Since the carrier plate was put back into the squeeze table as a part, the molding sand was scraped into the squeeze frame while preparing the mold for the next molding. Can be used as a part of the foundry sand in the molding of the mold.
[0017]
In the invention according to claim 6 configured as described above, the lower filling frame is provided so as to be able to move up and down around the model platen provided on the squeeze table and the model is attached, and the casting frame contact surface is set to the model setting. With the lower filling frame positioned at the raised position protruding from the board surface, the casting frame and the upper filling frame are superimposed on the lower filling frame to form a superimposed casting frame, and the measuring hopper storing the molding sand is superposed. Move to the position facing the casting flask and put the foundry sand into the overlapped casting flask, move the squeeze head to the position facing the overlapped casting flask after supplying the casting sand, and the lower surface of the casting flask is The squeeze table is raised relatively to the overlapped casting frame so as to coincide with the board surface, and the squeeze table and the squeeze head are relatively approached to each other to squeeze molding sand to form a mold. Amount of sand protruding from the top of the flask to the back side Measured, the lower filling frame was fixed to the adjustment position where the casting frame contact surface protruded from the surface of the model platen by the amount of protrusion set according to the amount of sand, so that the amount of sand was optimally controlled. There is no need to prepare separate equipment to remove excessive sand.
[0018]
In the invention according to claim 7 configured as described above, the lower filling frame is located at an ascending position where the casting frame contact surface protrudes from the surface of the model platen, and the lower filling frame is placed on the lower filling frame by a casting frame superposing apparatus. After forming the overlapped casting frame by superimposing the casting frame and the upper filling frame, the squeezing head and the squeeze table are put into the polymerization casting frame after the measuring hopper storing the casting sand is opposed to the polymerization casting frame and the casting sand is put into the polymerization casting frame. In conjunction with the movement to move in the horizontal direction to make them face each other, the molding sand raised from the upper end of the overlapped casting flask is scraped off and stored in the scraping sand hopper, and the scraped sand is brought into contact with the casting mold abutment surface of the model platen. Since the scraping sand hopper was put into the lower filling frame located at the raised position protruding from the board surface, the scraped sand can be used as a part of the molding sand in the molding of the next mold, Reduced sand regeneration costs and increased scrap sand transfer equipment It is possible to provide a casting mold making system of Kushida low cost.
[0019]
Embodiment
Hereinafter, a mold making method according to a first embodiment of the present invention and an apparatus for performing the method 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 movably mounted on the apparatus main body 2 along a molding path in the vertical direction, and is moved up and down by a cylinder device 3 fixed to the apparatus main body 2. It has become. Reference numeral 5 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 pair of roller conveyors 5 removably support the lower surfaces on both sides of the lower flange portion of the rectangular parallelepiped carrier plate 6. As shown in FIG. 3, the carrier plate 6 to be used next, into which the skin sand 38b has been introduced from the scraping sand hopper 46, is transported to the replacement position above the squeeze table 1 by the roller conveyor 5, and is replaced by a stop device (not shown). The squeeze table 1 is positioned at a position and is removably mounted on the squeeze table 1 which is raised by the cylinder device 3.
[0020]
A model base 9 on which a model 8 is mounted is fixed on the upper surface of the carrier plate 6, and a lower frame 10 is mounted on the outer periphery of the carrier plate 6 so as to be able to move up and down around the model base 9. A compression spring 14 is interposed between the upper surface of the four corners of the lower flange portion 6a of the carrier plate 6 and the lower surface of the lower filling frame 10, and the lower filling frame 10 is urged upward by the spring force of the compression spring 14. ing. Four rods 15 protrude downward from the lower surface of the lower frame 10 through the compression spring 14, and a large-diameter portion 15a provided at the lower end of the rod 15 has a stepped hole provided in the lower flange portion 6a. By contacting the shoulder 6b, the lower filling frame 10 is positioned at a raised position where the casting frame contact surface 10a protrudes from the plate surface 9a of the model platen 9. When the lower filling frame 10 is retracted against the spring force of the compression spring 14 and the stop portion 10b protruding from the lower surface comes into contact with the upper surface of the lower flange portion 6a, the casting frame contact surface 10a becomes It matches the board surface 9a. The lower frame is raised and lowered by a compression spring 14, a rod 15, and the like, between a retracted position where the casting frame contact surface 10a coincides with the plate surface 9a of the model platen 9 and a raised position protruding from the plate surface 9a. An apparatus 17 is configured.
[0021]
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 pair of roller conveyors 30 support the lower surfaces of both sides of the casting frame 31 in a detachable manner above the carrier plate replacement position. Next, the casting flask 31 to be molded is positioned on the roller conveyor 30 at a casting flask delivery position facing the squeeze table 1 in the molding path by a stop device (not shown). When the squeeze table 1 is raised by the cylinder device 3, the carrier plate 6 is placed on the squeeze table 1, and the casting frame 31 is transferred from the roller conveyor 30 to the casting frame contact surface 10 a of the lower filling frame 10. . Reference numeral 35 denotes an upper frame which is detachably mounted on the upper surface of the casting frame 31 and is connected at four corners to a piston rod of a cylinder device provided in the apparatus main body 2 so as to be vertically movable in a molding path. It is mounted. As the squeeze table 1 is raised by the cylinder device 3, the upper filling frame 35 is superimposed on the casting frame 31. With the cylinder device 3 for raising the squeeze table 1, the roller conveyor 30 for supporting the casting frame, and the upper filling frame support member, the casting frame 31 and the upper filling frame 35 are superimposed on the lower filling frame 10 located at the ascending position. A cast-frame overlaying device 39 constituting the overlapped cast flask 37 is configured.
[0022]
The cylinder device 3 stops the squeeze table 1 at the casting sand charging position shown in FIG. 4, and at this position, the casting sand 38 is charged from the measuring hopper 40 into the overlapped casting flask 37. As shown in FIG. 1, a shuttle 41 is mounted above the apparatus main body 2 so as to be movable in the horizontal direction, and is indexed and positioned by a cylinder device 42 at a casting sand charging position and a squeeze position. The weighing hopper 40 is attached to the shuttle 41, and when the shuttle 41 is indexed to the casting sand charging position, the weighing hopper 40 is opposed to the overlapped casting flask 37, and the measured casting sand 38 is filled in the overlapping casting flask 37. . At the lower end of the weighing hopper 40, a shutter 43 composed of a plurality of bottom plates, each of which is rotated around a horizontal axis by a rotation device (not shown), is provided. It is stored and turned in the vertical direction, and casting sand 38 is put into the overlapped casting flask 37. A squeeze head 45 is mounted on the shuttle 41 alongside the weighing hopper 40. When the shuttle 41 is indexed to the squeeze position, the squeeze head 45 faces the squeeze table 1. The shuttle 41 and the cylinder device 42 constitute an indexing device 36 for alternately indexing and positioning the weighing hopper 40 storing the casting sand 38 and the squeeze head 45 at a position facing the overlapped casting frame 37.
[0023]
Reference numeral 46 denotes a scraping sand hopper attached to the apparatus main body 2 via a weighing scale 49. The scraping hopper 46 is arranged in parallel with the overlapped casting flask 37 placed on the squeeze table 1 stopped at the casting sand charging position. The bridge plate 46a protrudes from the upper surface of the scraping sand hopper 46 toward the upper filling frame 10 so that there is no gap between the upper surface and the bridge plate 46a. As a result, the casting sand 38 thrown into the overlapped casting flask 37 from the measuring hopper 40 and raised from the upper end of the overlapped casting flask 37 is interlocked with the movement of the shuttle 41 to the squeeze position of the shuttle 41 facing the squeeze table 1. The hopper 40 is scraped off by the inner lower end surface of the weighing hopper 40 and put into the scraping hopper 46. At the skin sand supply position below the scraping sand hopper 46, a carrier plate 6 to be used next is positioned on the roller conveyor 5 by a stop device (not shown), and the scraped sand is used from the scraping sand hopper 46 for the next use. The casting frame abutment surface 10a is inserted into the lower embossing frame 10 positioned at a raised position above the board surface 9a of the model surface plate 9 while being fitted to the carrier plate 6 to be formed. Means for scraping the casting sand 38 raised from the upper end of the overlapped casting flask 37 of the casting sand 38 put into the overlapped casting flask 37 from the weighing hopper 40 is such that the squeeze head 45 moves to the squeeze position of the shuttle 41 facing the squeeze table 1. The scraper is not limited to one scraped by the inner lower end surface of the weighing hopper 40 in conjunction with the movement of the shuttle hopper 40. A scraping plate is provided in the shuttle 41, and the overlapped casting frame 37 is linked with the movement of the shuttle 41 to the squeeze position. The casting sand 38 raised from the upper end may be scraped and scraped into the scraping sand hopper 46 as the scraping sand 38a.
[0024]
At the center of the scraping sand hopper 46, a shutter 47 composed of a plurality of bottom plates, each of which is rotated around a horizontal axis by a rotation device (not shown), is provided. , And is turned in the vertical direction to drop the scraping sand 38a. In the scraping sand hopper 46, a crusher 48 is provided below a shutter 47. The crusher 48 opens the shutter 47 to crush and break the falling casting sand 38, and fits the carrier plate 6 positioned at the skin sand supply position. It is supplied as the skin sand 38b into the lower frame 10 that matches. The crusher 48 is provided with a plurality of discs rotationally driven by a motor arranged side by side in the horizontal direction, and two horizontal rods are protruded from each disc in the horizontal direction at positions eccentric to both diametrical sides from the center of rotation. The horizontal rod is eccentrically rotated by the rotation of the disk to strike and release the casting sand 38 which falls.
[0025]
When the shuttle 41 is indexed to the squeeze position, the weighing hopper 40 is positioned at a filling position below the end of the belt conveyor 50 that conveys the foundry sand 38, and the measured foundry sand 38 is filled. Since the belt conveyor 50 conveys the casting sand 38 having a constant width at a constant thickness, the rotation angle of the belt wheel 51 on which the belt conveyor 50 is hung is measured by a rotation angle meter 52 to move the belt conveyor 50 by a desired distance. The molding sand 38 thus measured is supplied to the measuring hopper 40.
[0026]
A cylinder 56 is provided vertically on a head body 55 on which the squeeze head 45 is mounted, and the squeeze head 45 is fixed to a tip of a piston rod projecting below a piston 57 slidably fitted to the cylinder 56. . The squeeze head 45 is fitted inside the overlapped casting flask 37, and squeezes the casting sand 38 put into the overlapped casting flask 37. The upper chamber of the cylinder 56 is selectively connected to the tank via a pressure source or a relief valve by a switching valve. Stop members 51 are vertically provided at four corners of the head main body 46 and abut against the four corners of the upper embossing frame 35 to regulate the rise of the overlapped casting frame 37.
[0027]
The operation of the embodiment configured as described above will be described. When the molding is completed, the molding flask 31 in which the mold 58 has been molded is carried out from the molding flask delivery position, and while the empty molding flask 31 is carried in (FIGS. 1 and 3), the shaping sand hopper 46 is formed by the previous molding. The amount of the scraped sand 38a that has been scraped is measured by the weighing scale 49, and the molding sand 38 obtained by subtracting the amount of the scraping sand 38a from the molding sand 38 necessary for the next molding is used to measure the rotation amount of the belt wheel 51. The measurement by 52 causes the belt conveyor 50 to move by the required distance and to be filled in the weighing hopper 40. When the carrier plate 6 to be used next after the lower filling frame 10 is located at the raised position at the skin sand supply position below the scraping sand hopper 46 is conveyed by the roller conveyor 5 and positioned by a stop device (not shown), After the crusher 48 is rotationally driven, the shutter 47 is opened and the scraping sand 38a is dropped, and the scraping sand 38a is broken and broken by the crusher 48 in the middle of the fall, and the lower bank located at the rising position It is thrown into the frame 10 as the skin sand 38 b so as to cover the model 8. Since the mold 58 is formed by covering the model 8 with the finely divided skin sand 38b, a casting having a smooth casting surface can be cast. At this time, the lower filling frame 10 is urged upward by the spring force of the compression spring, and the large-diameter portion 15a of the rod 15 contacts the shoulder of the stepped hole 6b formed in the lower flange portion 6a of the carrier plate 6. The casting frame abutment surface 10a is located at a raised position protruding from the surface 9a of the model surface plate 9. The carrier plate 6 separated from the mold 58 and placed on the roller conveyor 5 is carried out of the replacement position by the roller conveyor 5, and the carrier plate 6 to be used next after the skin sand is put into the lower filling frame 10 is removed. It is conveyed and positioned by the roller conveyor 5 from the skin sand supply position to the replacement position.
[0028]
The shuttle 41 is indexed and positioned at the casting sand charging position by the cylinder device 42 such that the weighing hopper 40 faces the squeeze table 1. Then, the squeeze table 1 receives the carrier plate 6, which has been raised by the cylinder device 3 and into which the skin sand 38 b has been put into the lower filling frame 10, from the roller conveyor 5 at the exchange position, and is further raised to form the flask 31. At the delivery position, it is received from the roller conveyor 30 onto the casting frame contact surface 10a of the lower filling frame 10. After the upper filling frame 35 is placed on the casting frame 31 to form the overlapped casting frame 37, the supply and discharge of the pressure oil to and from the cylinder device 3 of the squeeze table 1 are blocked, and the squeeze table 1 is temporarily stopped at the casting sand charging position. (FIG. 4). The shutter 43 of the weighing hopper 40 indexed and positioned above the squeeze table 1 is released, and the measured molding sand 38 stored in the weighing hopper 40 is poured into the overlapped casting flask 37 as back sand ( (Fig. 5).
[0029]
When the casting sand 38 is completely charged into the overlapped casting frame 37, the shuttle 41 is indexed to the squeeze position by the cylinder device 42 in order to make the squeeze head 45 face the squeeze table 1. The casting sand 38 that has been thrown into the overlapped casting flask 37 from the weighing hopper 40 and has risen from the upper end of the overlapped casting flask 37 is scraped off by the inner lower end surface of the weighing hopper 40 in conjunction with the movement of the shuttle 41 to the squeeze position. It is scraped into the scraping sand hopper 46 (FIG. 6).
[0030]
When the shuttle 41 is indexed to the squeeze position by the cylinder device 42 so that the squeeze head 45 faces the squeeze table 1, the squeeze table 1 is further raised by the cylinder device 3, and the casting sand The squeeze head 38 is raised and comes into contact with the squeeze head 45 located at the lower end, so that the back surface is squeezed. At this time, since the upper chamber of the cylinder 56 is communicated with the tank via the relief valve, the squeeze head 45 moves the molding sand 38 with the pressure corresponding to the relief pressure of the relief valve as the overlapped casting flask 37 rises. Retreat while squeezing back. When the upper surface of the upper filling frame 35 comes into contact with the stop members 51 provided at the four corners of the head main body 46, the rise of the overlapped casting frame 37 is regulated, and the model base 9 is fixed as the squeeze table 1 rises. The carrier plate 1 is raised against the overlapped casting frame 37 against the spring force of the compression spring 14, and the molding sand 38 is squeezed at a pressure corresponding to the relief pressure of the relief valve. Until the casting frame contact surface 10a coincides with the plate surface 9a of the model platen 9, the lower filling frame 10 is relatively retracted against the spring force of the compression spring 14, and the stop portion 10b of the lower filling frame 10 is moved to the carrier plate. When the squeeze table 1 is in contact with the upper surface of the lower flange portion 6a of the cylinder device 6, the rise of the squeeze table 1 is restricted, and the pressure in the lower chamber of the cylinder device 3 increases. When the pressure increase in the lower chamber is detected by the pressure sensor, the upper chamber of the cylinder 56 is connected to the pressure source by the switching valve, the piston 57 is pressed at a predetermined pressure, and the molding sand 38 is squeezed by the squeeze head 45 on the back side. (FIG. 7).
[0031]
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 lower filling frame 10 is raised to a raised position with respect to the carrier plate 6 by the spring force of the compression spring 14, and the casting frame 31 placed on the casting frame contact surface 10a also has the carrier plate 6, the model surface plate 9, the model 8 , The model 8 is released from the mold 58 formed in the flask 31 before the flask 31 is transferred onto the roller conveyor 30 (FIG. 8).
[0032]
The squeeze table 1 is further lowered by the cylinder device 3, the casting frame 31 is placed on the roller conveyor 30 and detached from the lower filling frame 10, and the carrier plate 6 is transferred to the roller conveyor 5 and the squeeze table 1 And then the squeeze table 1 stops at the lower end. The squeeze head 45 is returned to the lower end by lowering the piston 57 by switching the switching valve (FIG. 9). The casting frame 31 placed on the roller conveyor 30 is transported to a pouring station (not shown) by the roller conveyor 30, and the carrier plate 6 placed on the roller conveyor 5 is unloaded from the exchange position by the roller conveyor 5, Hereinafter, the molding cycle is similarly repeated.
[0033]
If the amount of sand t (see FIG. 9) protruding from the upper end of the molding frame 31 to the rear side of the molded mold 58 fluctuates or is too large, it is necessary to provide a cutting device separately and cut off in a later step. The amount of sand t varies depending on the amount of molding sand 38 in the overlapped casting flask 37 which has been thrown into the overlapped casting flask 37 from the weighing hopper 40 and which has been raised from the upper end and scraped off. Is to set the amount of the casting sand 38 in the overlapped casting frame 37 based on the sanding amount t of the previously molded mold 58 to optimally control the sanding amount. For this reason, when the flask 31 in which the mold 58 is formed is placed on the roller conveyor 30, the sanding amount t projecting from the upper end of the flask 31 of the mold 58 to the back side is measured by the dimension measuring device 60. Before scraping the portion of the molding sand 38 charged from the measuring hopper 40 into the overlapped casting flask 37 from the upper end of the overlapped casting flask 37, the casting flask contact surface 10 a is moved from the board surface 9 a of the model platen 9. The amount of protrusion that protrudes is set according to the sand amount t. That is, as shown in FIG. 10, at the casting sand charging position, the upper pile frame 35 having four corners connected to the piston rod 62 of the cylinder device 61 and held at the lower end position is located, and the squeeze table 1 When the plate 6 is received from the roller conveyor 5 and rises to the casting sand charging position, the casting frame 31 placed on the lower filling frame 10 comes into contact with the upper filling frame 35 to form the overlapped casting frame 37.
[0034]
Since the large sand amount t of the previously formed mold 58 is a large amount of the molding sand 38 in the overlapped casting flask 37, the squeeze table 1 is raised and adjusted according to the sand amount t. The board surface 9a of the model base 9 is raised with respect to the lower frame 10 by an amount. The adjustment amount for raising the board surface 9a with respect to the lower filling frame 10 is registered in the memory of the control device 64 in correspondence with the sand amount t for each model 8. The adjustment amount for the measured sanding amount t of the mold 58 is read from the memory, and the position of the squeeze table 1 detected by the position detection device 63 is adjusted to the stop position of the squeeze table 1 at the casting sand injection position. The squeeze table 1 is lifted by the cylinder device 3 and stopped until it becomes equal to the adjustment position obtained by adding.
[0035]
After the squeeze table 1 is raised to the adjustment position and the molding sand 38 is put into the overlapped casting frame 37 from the hopper 40, the shuttle 37 is operated by the cylinder device 42 to make the squeeze head 45 face the squeeze table 1. Indexed to the squeeze position. The casting sand 38 that has been thrown into the overlapped casting flask 37 from the weighing hopper 40 and has risen from the upper end of the overlapped casting flask 37 is scraped off by the inner lower end surface of the weighing hopper 40 in conjunction with the movement of the shuttle 41 to the squeeze position. It is scraped into the scraping sand hopper 46. When the shuttle 41 is indexed to the squeeze position, the supply of hydraulic pressure to the cylinder device 61 is cut off, and the piston rod 62 and thus the upper frame 35 can freely move up and down. The squeeze table 1 is further raised by the cylinder device 3, and the molding sand 38 filled in the overlapped casting flask 37 is squeezed in the same manner as described above. After the squeeze is completed, the carrier plate 6 placed on the roller conveyor 5 by the lowering of the squeeze table 1 is carried out of the exchange position by the roller conveyor 5.
[0036]
In the above-described embodiment, the compression springs 14 are interposed between the lower filling frame 10 and the carrier plate 6 as the lower filling frame lifting / lowering device 17, but cylinder devices are provided at four corners of the squeeze table 1. The lower filling frame 10 may be moved between the raised position and the retracted position by raising and lowering the piston rod.
[0037]
Also, in the above embodiment, in order to provide the lower frame on the squeeze table so as to be able to move up and down around the model platen on which the model is mounted, the lower frame can be moved up and down around the model platen on the carrier plate. The carrier plate is attached to and detached from the squeeze table, but the model surface plate is fixed on the squeeze table, and the lower frame is mounted on the squeeze table so as to be able to move up and down around the model surface plate. You may.
[0038]
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.
[Brief description of the drawings]
FIG. 1 is a view showing a mold making apparatus according to an embodiment.
FIG. 2 is a diagram showing a carrier plate on which a lower frame is mounted.
FIG. 3 is a view showing a state in which casting sand is put into a weighing hopper from a conveyor, and skin sand is put into a lower filling frame from a scraping sand hopper.
FIG. 4 is a view showing a state in which a measuring hopper is opposed to an overlapped casting flask located at a casting sand charging position.
FIG. 5 is a view showing a state in which molding sand is charged from a weighing hopper into an overlapped casting flask located at a molding sand charging position.
FIG. 6 is a diagram showing a state in which molding sand that has risen from the upper end of the overlapped casting flask is scraped into a sand hopper in conjunction with the movement of the squeeze head facing the overlapped casting flask.
FIG. 7 is a diagram showing a squeeze state.
FIG. 8 is a diagram showing a release state.
FIG. 9 is a diagram showing a state at the time of completion of one cycle.
FIG. 10 is a diagram showing a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Squeeze table, 2 ... Device main body, 3, 42, 65 ... Cylinder device, 6 ... Carrier plate, 5, 30 ... Roller conveyor, 8 ... Model, 9 ... Model platen, 9a ... Board surface, 10 ... Lower frame Reference numeral 10a: Casting frame contact surface, 17: Lower filling frame elevating device, 31: Casting frame, 35: Upper filling frame, 37: Overlay casting frame, 39: Overlay casting device, 40: Measuring hopper, 41: Shuttle, 45: squeeze head, 46: scraping sand hopper, 48: crusher, 49: weight scale, 56: cylinder, 57: piston, 50: belt conveyor, 58: mold, 60: dimension measuring device, cylinder device 61.

Claims

A squeeze table and a squeeze head are provided so as to be relatively movable forward and backward along the molding path, and a lower filling frame is provided so as to be able to move up and down around the model platen on which the model is mounted. With the lower filling frame positioned at the raised position protruding from the surface of the model platen, skin sand is poured into the lower filling frame, and the casting frame and the upper filling frame are superimposed on the lower filling frame to perform polymerization casting. Forming a frame, supplying back sand into the overlapped casting frame, and after supplying the casting sand, bringing the squeeze table and the squeeze head close to each other to squeeze the skin sand and the back sand to form a mold. Characteristic mold making method.

A lower filling frame is provided so as to be able to move up and down around a model platen provided with a model provided on a squeeze table, and a casting frame and an upper filling frame are superimposed on the lower filling frame to form a polymerization casting frame. The weighing hopper storing the molding sand is moved to a position opposed to the overlapped casting flask, the casting sand is charged into the overlapped molding flask, and after the molding sand is supplied, the squeeze head is moved to a position opposed to the overlapped molding flask. Then, in the method of making the squeeze table and the squeeze head close to each other and squeezing the molding sand to form a mold, the squeeze head is interlocked with the movement of moving horizontally to face the squeeze table. The molding sand raised from the upper end of the overlapped casting flask is scraped off and stored in a scraping sand hopper. Inside Casting mold making method characterized by scraping charged from the sand hopper, for use as part of the molding sand scraped sand molding of the next mold.

The method according to claim 2, wherein a weight scale is attached to the scraping sand hopper to measure the weight of the scraped sand, and a shortage is stored in the measuring hopper.

When the scraped molding sand is thrown from the scraping sand hopper into a lower molding frame located at a raised position where the casting frame contacting surface protrudes from the surface of the model platen, it is unraveled by a crusher and the following is performed. The method according to claim 2 or 3, wherein the method is used as skin sand for molding a mold.

A lower filling frame is provided so as to be able to move up and down around a model platen on which a model is mounted on a carrier plate that is attached to and detached from the upper surface of the squeeze table, and a casting frame abutment surface is at a raised position protruding from the platen surface of the model platen. With the lower filling frame raised, move the carrier plate below the scraping sand hopper, and put the scraped molding sand into the lower filling frame as a part of the molding sand for the next mold molding. 5. The method according to claim 3, wherein the carrier plate is returned on the squeeze table thereafter.

A lower filling frame is provided so as to be able to move up and down around a model platen provided on a squeeze table and on which a model is mounted, and the lower filling frame is positioned at an ascending position where a casting frame contact surface protrudes from the platen surface of the model platen. In this state, the casting frame and the upper molding frame are superimposed on the lower molding frame to form a polymerization molding frame, and the measuring hopper storing the molding sand is moved to a position facing the polymerization molding frame to move the molding sand. Is poured into the overlapped casting flask, and after the molding sand is supplied, the squeeze head is moved to a position opposed to the overlapped casting flask, and the squeeze table is moved so that the lower surface of the casting flask coincides with the surface of the model platen. And raising the squeeze table and the squeeze head close to each other and squeezing the molding sand to form a mold. The back from the top of the frame Before measuring the amount of sand protruding into the overlapped casting flask and scraping the foundry sand, the casting frame abutment surface is adjusted by the amount of sand set according to the amount of sand, and the surface of the model surface plate A mold molding method characterized by being fixed to a protruding adjustment position.

A squeeze table and a squeeze head which are provided in the apparatus main body and are relatively moved forward and backward along the molding path by a driving device, and a squeeze table which can move up and down around a model base plate on which the model is mounted. The provided lower filling frame, a lower filling frame elevating device for raising and lowering the lower filling frame between a retracted position where the casting frame contact surface coincides with the plate surface of the model platen and a raised position protruding from the plate surface. A casting flask polymerization apparatus that forms a polymerization casting frame by superimposing a casting flask and an upper molding frame on a lower molding frame located at the ascending position, a weighing hopper storing casting sand, and the squeeze head. An indexing device for alternately indexing and positioning at a position opposed to the frame, and means for scraping molding sand that has risen from the upper end of the overlapped molding flask of the molding sand poured into the overlapped molding flask from the weighing hopper; Polymerization casting Side by side with casting mold making system, characterized in that a and scraping sand hopper accommodates the scraped sand provided in the apparatus main body.