JP2004306143A - Molding process for sand molding with frames - Google Patents
Molding process for sand molding with frames Download PDFInfo
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- JP2004306143A JP2004306143A JP2004227660A JP2004227660A JP2004306143A JP 2004306143 A JP2004306143 A JP 2004306143A JP 2004227660 A JP2004227660 A JP 2004227660A JP 2004227660 A JP2004227660 A JP 2004227660A JP 2004306143 A JP2004306143 A JP 2004306143A
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Abstract
Description
本発明は、搬入されてくる空の鋳枠に対し上下砂鋳型を交互に造型して搬出させる枠付砂鋳型の造型方法に関する。 The present invention relates to a molding method of a sand mold with a frame, in which upper and lower sand molds are alternately molded with respect to an empty casting frame that is carried in and are carried out.
従来、鋳枠内に砂鋳型を造型する場合は、パタ−ンプレ−トの上部に鋳枠と盛枠を重ね合わせた空間に鋳物砂を投入充填し、この投入充填された鋳物砂を掻き均した後、平板状のスクイズ板あるいはセグメント方式のスクイズフットにより圧縮する造型機が一般に採用されている。 Conventionally, when a sand casting mold is formed in a casting flask, casting sand is charged and filled into a space in which the casting frame and the filling frame are overlapped on the upper part of the pattern plate. After that, a molding machine that compresses with a flat squeeze plate or a segment type squeeze foot is generally employed.
また、下部補助枠つきのスクイズ造型は公知である。この造型は、鋳物砂を鋳枠、パタ−ン及び下部補助枠（増し枠）により画成された造型空間に投入後、上部加圧ヘッド及び下部加圧ヘッドで圧縮するものである。そして、この造型に用いられる抜型方法は、先ず下部加圧シリンダを作動させ下部加圧ヘッドを降下させ、鋳型からパタ−ンを抜き取ると共に、上部加圧シリンダを作動させて上部加圧ヘッドを上昇させる。続いて、増し枠固定装置を作動させて鋳枠の固定を解放し鋳型造型済み鋳枠を搬送ロ−ラにより次の工程に搬出している。 Squeeze molding with a lower auxiliary frame is also known. In this molding, casting sand is put into a molding space defined by a casting frame, a pattern and a lower auxiliary frame (additional frame), and then compressed by an upper pressing head and a lower pressing head. In the molding method used for this molding, first, the lower pressurizing cylinder is operated to lower the lower pressurizing head, the pattern is removed from the mold, and the upper pressurizing cylinder is operated to raise the upper pressurizing head. Let it. Subsequently, the additional frame fixing device is operated to release the fixing of the flask, and the molded frame is unloaded to the next step by the transport roller.
しかし上記のように鋳物砂を鋳枠内に投入充填して掻き均しをする際にはスピルサンドが多く出る問題がある。さらに平板状のスクイズ板を使用する鋳物砂の圧縮ではパタ−ンプレ−トの模型の高い部分と低い部分で圧縮が不均一になり、特に模型の低い部分の圧縮が不足する問題がある。またセグメント方式のスクイズフットにより鋳物砂を圧縮するものでは造型された砂鋳型の上面が平坦にならず鋳型造型後凹凸面を削り取る作業が必要になり、鋳物砂の無駄が多くなる問題がある。
本発明は上記の問題に鑑みて成されたもので、スピルサンドや切削砂の発生を大幅に削減すると共に鋳物砂の圧縮が鋳型全体に均一に成される付砂鋳型の造型方法を提供することを目的とする。
However, there is a problem that a large amount of spill sand is generated when the casting sand is charged into the casting flask and leveled as described above. Further, in the compression of molding sand using a flat squeeze plate, there is a problem that the compression is not uniform between the high portion and the low portion of the pattern plate, and the compression is particularly insufficient at the low portion of the pattern. In the case where the molding sand is compressed by a segment type squeeze foot, the upper surface of the molded sand mold is not flattened, and an operation of shaving off the uneven surface after the molding is required.
The present invention has been made in view of the above problems, and provides a method for molding a sand mold in which the occurrence of spill sand and cutting sand is significantly reduced and the compression of the molding sand is uniformly performed over the entire mold. With the goal.
上記の目的を達成するために本発明における枠付砂鋳型の造型方法は、パタ−ンプレ−ト、下部補助枠、鋳枠、盛枠及びパタ−ンプレ−トの凹凸に相対する凹凸を形成したセグメント方式のスクイズフットとにより画成する造型空間に鋳物砂を充填し、前記セグメント方式のスクイズフットを下降挿入させて鋳物砂をスクイズし、続いて、前記スクイズフット、前記盛枠、前記鋳枠及び前記下部補助枠を一体的にパタ−ンプレ−トに向けて下降させて前記鋳物砂をスクイズし、その後、前記スクイズフットを下降して鋳物砂をさらにスクイズすることを特徴とする。 In order to achieve the above object, the method of molding a sand mold with a frame according to the present invention is such that irregularities corresponding to the irregularities of a pattern plate, a lower auxiliary frame, a casting frame, a filling frame and a pattern plate are formed. The molding space defined by the segment type squeeze foot is filled with molding sand, the segment type squeeze foot is inserted downward to squeeze the molding sand, and then the squeeze foot, the filling frame, and the molding frame And lowering the lower auxiliary frame integrally toward the pattern plate to squeeze the molding sand, and then lowering the squeeze foot to further squeeze the molding sand.
本発明は上記の説明から明らかなように、パタ−ンプレ−ト、下部補助枠、鋳枠、盛枠及びパタ−ンプレ−トの凹凸に相対する凹凸を形成したセグメント方式のスクイズフットとにより画成する造型空間に鋳物砂を充填し、前記セグメント方式のスクイズフットを下降挿入させて鋳物砂をスクイズし、続いて、前記スクイズフット、前記盛枠、前記鋳枠及び前記下部補助枠を一体的にパタ−ンプレ−トに向けて下降させて前記鋳物砂をスクイズし、その後、前記スクイズフットを下降して鋳物砂をさらにスクイズするから、スピルサンド及び切削砂の発生を大幅に削減して鋳物砂を定量的に効率良く充填できると共にパタ−ンプレ−トの凹凸に合わせたスクイズを鋳型全体に行うことができるようになり、均質な鋳型を造型できる効果がある。 As is apparent from the above description, the present invention is defined by a pattern plate, a lower auxiliary frame, a casting frame, a fill frame, and a segment type squeeze foot formed with irregularities corresponding to the irregularities of the pattern plate. The molding space to be formed is filled with molding sand, and the squeeze foot of the segment type is inserted downward to squeeze the molding sand. Subsequently, the squeeze foot, the filling frame, the molding frame and the lower auxiliary frame are integrally formed. The casting sand is squeezed by lowering it toward the pattern plate, and then the squeeze foot is lowered to further squeeze the casting sand. Can be quantitatively and efficiently filled, and the entire mold can be squeezed in conformity with the pattern plate irregularities, thereby producing a uniform mold.
以下本発明の実施の形態を図面に基づいて詳しく説明する。図１において、造型基盤１上の左右両側に枠セットシリンダ２、２が上向きにして立設されており、該枠セットシリンダ２、２のピストンロッド２Ａ、２Ａ先端間には昇降支持フレ−ム３が架設されている。即ち、枠セットシリンダ２、２は造型基盤１側を縮引端として上向きにして立設されている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, frame setting cylinders 2 are erected on both sides of a molding base 1 in an upward direction, and a lifting support frame is provided between the ends of the piston rods 2A and 2A of the frame setting cylinders 2 and 2. 3 are installed. That is, the frame set cylinders 2 and 2 are erected upward with the molding base 1 side as a contraction end.
前記枠セットシリンダ２、２のうちの一方（図１で左側）下位にはパタ−ン交換装置４の中心部が水平平面内で回転可能にして支持されており、該パタ−ン交換装置４の両端部には、パタ−ンプレ−ト５、５Ａ（上下パタ−ンプレ−ト）を載置したパタ−ンキャリア６、６Ａが図示されないスプリングにより５ｍｍ程度持ち上げられた状態でセットされ、該パタ−ンプレ−ト５、５Ａを前記造型基盤１の中央上部に交互に搬入出させるようにされている。
また、パタ−ンキャリア６、６Ａには、図示されないクランプ部材が設けられており、前記造型基盤１には該クランプ部材をクランプする図示されないクランプ装置が設けられている。パタ−ンキャリア６、６Ａの造型基盤１上への圧着は、該クランプ装置により前記クランプ部材を引っ張ってクランプすることにより成される。
A lower part of one of the frame setting cylinders 2 (left side in FIG. 1) supports a center portion of a pattern changing device 4 rotatably in a horizontal plane. The pattern carriers 6, 6A, on which pattern plates 5, 5A (upper and lower pattern plates) are placed, are set at both ends of each of them by being lifted by about 5 mm by a spring (not shown). The plates 5, 5A are alternately carried into and out of the upper central portion of the molding base 1.
The pattern carriers 6 and 6A are provided with a clamp member (not shown), and the molding base 1 is provided with a clamp device (not shown) for clamping the clamp member. The crimping of the pattern carriers 6, 6A onto the molding base 1 is performed by pulling and clamping the clamp member by the clamp device.
前記パタ−ンプレ−ト５の上部には、パタ−ンプレ−ト５の外周を上下摺動可能にして包囲した枠状の下部補助枠７が配設されており、該下部補助枠７は下部補助枠シリンダ８、８に連結されている。
また前記昇降支持フレ−ム３には、上端にスライドゲ−ト９により開閉される砂投入口１０を設けると共に上側部に図示されない切り替え弁を介して低圧エヤ−（例えば、０．０５〜０．１８ＭＰａ）を導入する給気管１１を連通させ、かつ下位周側及び下位内部に図示されない１個の切り替え弁を介して図示されない圧縮空気源に連通する多数のエヤ−噴出チャンバ−１２、１２を備えた砂ホッパ１３が吊設されている。なお多数のエヤ−噴出チャンバ−１２、１２からは低圧エヤ−（例えば、０．０５〜０．１８ＭＰａ）が砂ホッパ１３内に噴出されて鋳物砂Ｓを浮遊流動化させるエヤレ−ションを成すように構成されている。
さらに砂ホッパ１３の下端には、セグメント方式のスクイズフット１４、１４と該スクイズフット１４、１４の周囲に砂充填用ノズル１５、１５が配設されている。
On the upper part of the pattern plate 5, a frame-shaped lower auxiliary frame 7 surrounding the outer periphery of the pattern plate 5 so as to be vertically slidable is provided. The auxiliary frame cylinders 8 are connected to each other.
The lifting support frame 3 is provided at its upper end with a sand inlet 10 which is opened and closed by a slide gate 9 and has a low-pressure air (for example, 0.05-0. A plurality of air ejection chambers 12 and 12 are provided on the lower peripheral side and the lower inner side of the air supply pipe 11 for introducing the compressed air to a compressed air source (not shown) through one switching valve (not shown). A sand hopper 13 is suspended. It should be noted that low-pressure air (for example, 0.05 to 0.18 MPa) is jetted from the large number of air jetting chambers 12 and 12 into the sand hopper 13 so as to form an air suspension for floating the casting sand S. Is configured.
Further, at the lower end of the sand hopper 13, segment type squeeze feet 14, and sand filling nozzles 15, 15 are arranged around the squeeze feet 14, 14.
また前記スクイズフット１４、１４及び砂充填用ノズル１５、１５の群の外周を上下動可能にして包囲すると共に上位に図示されない排気制御チャンバ−に通じるベントホ−ル１６、１６を穿孔した盛枠１７が、該盛枠１７の左右外側位置において上向きにして設けられた盛枠シリンダ１８、１８に連結されて配設されている。
さらに盛枠シリンダ１８、１８の左右外側位置には、前記昇降支持フレ−ム３に吊設されたコンベヤ昇降シリンダ１９、１９が下向きにして配設されており、先端にはロ−ラ２０Ａ、２０Ａを備えた鋳枠２１の搬入出コンベヤ２０、２０が連結されている。該搬入出コンベヤ２０、２０の上端部には前記盛枠シリンダ１８、１８が取り付けられており、下端部には前記下部補助枠シリンダ８、８が取り付けられている。
また前記枠セットシリンダ２、２の内側には、シリンダロッド２２Ａ、２２Ａを備えたストッパ−シリンダ２２、２２が付設されている。
In addition, the squeeze feet 14 and 14 and the sand filling nozzles 15 and 15 are vertically movable so as to surround the outer circumference of the group, and a filling frame 17 having perforated vent holes 16 and 16 communicating with an exhaust control chamber (not shown). Are connected to and arranged at the left and right outer positions of the filling frame 17 with the filling frame cylinders 18, 18 provided upward.
Conveyor elevating cylinders 19, 19 suspended from the elevating support frame 3 are disposed at the left and right outer positions of the filling frame cylinders 18, 18 in a downward direction. The conveyors 20, 20 for loading and unloading the casting flask 21 with 20A are connected. The filling frame cylinders 18, 18 are attached to upper ends of the carry-in / out conveyors 20, 20, and the lower auxiliary frame cylinders 8, 8 are attached to lower ends thereof.
Further, stopper cylinders 22, 22 having cylinder rods 22A, 22A are provided inside the frame set cylinders 2, 2, respectively.
次にこのように構成されたものの作動を詳しく説明する。図１の状態は、砂ホッパ１３内に鋳物砂Ｓが投入され、スクイズフット１４、１４全体が下方のパタ−ンプレ−ト５の凹凸に相対して凹凸を形成し、かつ搬入出コンベヤ２０、２０に空の鋳枠２１が搬入された後、盛枠１７及び搬入出コンベヤ２０、２０に備えられたロ−ラ２０Ａ、２０Ａにより鋳枠２１を挟みつけて該鋳枠２１の動きを拘束させると共に鋳枠２１が持ち上がらない圧力で下部補助枠シリンダ８、８を縮引作動させて下部補助枠７上面を鋳枠２１下面に押しつけた状態にある。なおストッパ−シリンダ２２、２２は伸長端まで伸長された状態にある。またパタ−ンキャリア６は図示されないスプリングにより５ｍｍ程度持ち上げられた状態でパタ−ン交換装置４上にセットされて造型基盤１との間に５ｍｍ程度の隙間がある
。
Next, the operation of the above-described structure will be described in detail. In the state shown in FIG. 1, the casting sand S is put into the sand hopper 13, the whole of the squeeze feet 14, 14 form irregularities relative to the irregularities of the lower pattern plate 5, and the carry-in / out conveyor 20, After the empty casting frame 21 is carried into the casting frame 20, the casting frame 21 is sandwiched between the filling frame 17 and the rollers 20A, 20A provided on the loading / unloading conveyors 20, 20 to restrict the movement of the casting frame 21. At the same time, the lower auxiliary frame cylinders 8, 8 are contracted by a pressure at which the flask 21 does not lift, and the upper surface of the lower auxiliary frame 7 is pressed against the lower surface of the flask 21. The stopper cylinders 22, 22 are in a state of being extended to the extended end. The pattern carrier 6 is set on the pattern exchange device 4 in a state of being lifted by about 5 mm by a spring (not shown), and has a gap of about 5 mm between the pattern carrier 6 and the molding base 1.
この状態でスライドゲ−ト９を作動させて砂投入口１０を閉じると共にパタ−ンキャリア６に設けられた図示されないクランプ部材を造型基盤１に設けられた図示されないクランプ装置により引っ張ってクランプすることによりパタ−ンキャリア６を図示されないスプリングに抗して押し下げ、造型基盤１上に圧着する。
その後、コンベヤ昇降シリンダ１９、１９により搬入出コンベヤ２０、２０を介して前記拘束された鋳枠２１と昇降支持フレ−ム３との動きを拘束した状態で、枠セットシリンダ２、２が縮引作動することにより枠セットされ、図２の状態になる。この際、パタ−ンプレ−ト５、下部補助枠７、鋳枠２１、盛枠１７、スクイズフット１４、１４で画成する造型空間は、スクイズフット１４、１４がパタ−ンプレ−ト５の凹凸に相対する凹凸形状に形成された状態になる。
In this state, the slide gate 9 is operated to close the sand inlet 10 and the clamp member (not shown) provided on the pattern carrier 6 is pulled and clamped by a clamp device (not shown) provided on the molding base 1. The pattern carrier 6 is pressed down against a spring (not shown) and pressed onto the molding base 1.
Thereafter, the frame set cylinders 2, 2 are retracted while the movement of the restricted casting frame 21 and the lifting support frame 3 is restricted by the conveyor lifting cylinders 19, 19 via the loading / unloading conveyors 20, 20. The frame is set by the operation, and the state shown in FIG. 2 is obtained. At this time, the molding space defined by the pattern plate 5, the lower auxiliary frame 7, the casting frame 21, the filling frame 17, and the squeeze feet 14, 14 is such that the squeeze feet 14, 14 have the irregularities of the pattern plate 5. Is formed in a concavo-convex shape corresponding to.
この枠セットは、搬入出コンベヤ２０、２０がストッパ−シリンダ２２、２２のシリンダロッド２２Ａ、２２Ａ先端に接触するまで続けられるが、接触した時点で砂ホッパ１３、スクイズフット１４、１４及び砂充填用ノズル１５、１５が設定位置に到達していない場合は、コンベヤ昇降シリンダ１９、１９により前記拘束された鋳枠２１と昇降支持フレ−ム３との動きの拘束を解除して、コンベヤ昇降シリンダ１９、１９を縮引作動させながらさらに枠セットシリンダ２、２を縮引作動させる。この際、コンベヤ昇降シリンダ１９、１９及び枠セットシリンダ２、２の縮引作動は前記砂ホッパ１３、スクイズフット１４、１４及び砂充填用ノズル１５、１５が設定位置に到達するまで続けられる。なお、設定位置はパタ−ンプレ−トの形状などを考慮して適宜最適な位置が設定される。 This frame setting is continued until the carry-in / out conveyors 20, 20 contact the tips of the cylinder rods 22A, 22A of the stopper cylinders 22, 22, at which point the sand hopper 13, the squeeze feet 14, 14 and the sand filling When the nozzles 15, 15 have not reached the set position, the movement of the confined flask 21 and the lifting support frame 3 restrained by the conveyor lifting cylinders 19, 19 is released, and the conveyor lifting cylinder 19 is released. , 19 are contracted, and the frame set cylinders 2, 2 are further contracted. At this time, the retracting operation of the conveyor lifting cylinders 19, 19 and the frame setting cylinders 2, 2 is continued until the sand hopper 13, the squeeze feet 14, 14 and the sand filling nozzles 15, 15 reach the set positions. The optimal position is set as appropriate in consideration of the shape of the pattern plate and the like.
次に多数のエヤ−噴出チャンバ−１２、１２から低圧エヤ−を砂ホッパ１３内に噴出させて砂ホッパ１３内の鋳物砂Ｓを浮遊流動化させるエヤレ−ションをさせながら図示されない切り替え弁を介して給気管１１から低圧エヤ−を砂ホッパ１３に供給して鋳物砂Ｓを低圧エヤ−により造型空間に砂充填用ノズル１５、１５を介してエヤレ−ション充填する。この際、エヤレ−ション充填時の低圧エヤ−は、ベントホ−ル１６、１６又は／及びパタ−ンプレ−ト５の図示されないベントホ−ルから排気される。なお、図示されない排気制御チャンバ−でベントホ−ル１６、１６からの排気量を制御することによりパタ−ンプレ−ト５の図示されないベントホ−ルからの排気量を制御することもできる。これにより造型空間におけるパタ−ンプレ−ト５の複雑形状部の鋳物砂の充填密度を部分的に調整す
ることができる。
Next, a low-pressure air is blown out from a large number of air blow-out chambers 12 and 12 into the sand hopper 13 so as to cause the molding sand S in the sand hopper 13 to float and fluidize through a switching valve (not shown). Then, low-pressure air is supplied from the air supply pipe 11 to the sand hopper 13, and the molding sand S is air-filled into the molding space by the low-pressure air through the sand filling nozzles 15, 15. At this time, the low-pressure air at the time of filling the air hole is exhausted from a vent hole (not shown) of the vent holes 16, 16 and / or the pattern plate 5. By controlling the amount of exhaust from the vent holes 16 and 16 in an exhaust control chamber (not shown), the amount of exhaust from the vent hole (not shown) of the pattern plate 5 can be controlled. This makes it possible to partially adjust the filling density of the molding sand in the complicated shape portion of the pattern plate 5 in the molding space.
次に枠セットシリンダ２、２がさらに縮引作動してコンベヤ昇降シリンダ１９、１９を縮引させながら昇降支持フレ−ム３及びこれに支持されている部材を下降させてゆき、スクイズフット１４、１４下面全体が平坦になるまで鋳物砂Ｓの一次スクイズをすると共にスライドゲ−ト９を逆作動させて砂投入口１０を開放する。この際、枠セットシリンダ２、２の縮引作動は、図示されない圧力センサ−によりスクイズ圧力が一次スクイズの設定圧力に到達する又は枠セットシリンダ２、２の図示されないエンコ−ダ位置が一次スクイズの設定位置に到達するまで続けられる。 Next, the frame setting cylinders 2 and 2 are further contracted to lower the elevator supporting frame 3 and the members supported thereon while contracting the conveyor elevating cylinders 19 and 19, and the squeeze foot 14, 14. The primary sand of the casting sand S is squeezed until the entire lower surface becomes flat, and the slide gate 9 is operated in reverse to open the sand inlet 10. At this time, the contraction operation of the frame set cylinders 2 and 2 is performed by a pressure sensor (not shown) when the squeeze pressure reaches the set pressure of the primary squeeze or when the encoder position (not shown) of the frame set cylinders 2 and 2 is set to the primary squeeze. It continues until it reaches the set position.
次にコンベヤ昇降シリンダ１９、１９により搬入出コンベヤ２０、２０を介して前記拘束された鋳枠２１と昇降支持フレ−ム３との動きを拘束した状態で、ストッパ−シリンダ２２、２２の油をリリ−フする状態に切り替えて枠セットシリンダ２、２を一次スクイズより高い圧力で縮引作動させることにより、ストッパ−シリンダ２２、２２を縮引作動させながらスクイズフット１４、１４、盛枠１７、鋳枠２１、下部補助枠７、搬入出コンベヤ２０、２０及びコンベヤ昇降シリンダ１９、１９を一体的にパタ−ンプレ−ト５に向けて下降させて鋳物砂Ｓ全体を二次スクイズする。これにより下部補助枠７はストッパ−シリンダ２２、２２の縮引により下降されて、該下部補助枠７上面はパタ−ンプレ−ト５の見切面とほぼ同一レベルにされる。
その後、ストッパ−シリンダ２２、２２が下降端に到達した時点でスクイズ圧力が二次スクイズの設定圧力に到達していない場合は、コンベヤ昇降シリンダ１９、１９により前記拘束された鋳枠２１と昇降支持フレ−ム３との動きの拘束を解除して、コンベヤ昇降シリンダ１９、１９を縮引作動させながらさらに枠セットシリンダ２、２を縮引作動させることによりスクイズフット１４、１４を下降して更なるスクイズが成される。
Next, the oil of the stopper cylinders 22 and 22 is removed while the movement of the restricted casting frame 21 and the lifting and lowering support frame 3 is restricted by the conveyor lifting and lowering cylinders 19 and 19 via the loading and unloading conveyors 20 and 20. The squeeze feet 14, 14, the filling frame 17, while the stopper cylinders 22, 22 are contracted by switching to the relieving state and contracting the frame set cylinders 2, 2 at a pressure higher than the primary squeeze. The casting frame 21, the lower auxiliary frame 7, the carry-in / out conveyors 20, 20, and the conveyor lifting / lowering cylinders 19, 19 are integrally lowered toward the pattern plate 5 to secondary squeeze the entire molding sand S. As a result, the lower auxiliary frame 7 is lowered by the contraction of the stopper cylinders 22, 22, so that the upper surface of the lower auxiliary frame 7 is substantially at the same level as the parting surface of the pattern plate 5.
Thereafter, if the squeeze pressure does not reach the secondary squeeze set pressure when the stopper cylinders 22 and 22 reach the lower end, the confined flask 21 and the elevating support are conveyed by the conveyor elevating cylinders 19 and 19. The squeeze feet 14, 14 are lowered by releasing the restraint of the movement with the frame 3 and further contracting the frame setting cylinders 2, 2 while contracting the conveyor elevating cylinders 19, 19. A squeeze is made.
次にスクイズ圧力が二次スクイズの設定圧力に到達すると、スクイズ安定タイマ−が作動し、所定時間スクイズを保持する。この時、ストッパ−シリンダ２２、２２が下降端に到達していない場合に対応するためにコンベヤ昇降シリンダ１９、１９を伸長作動させて搬入出コンベヤ２０、２０を下降させストッパ−シリンダ２２、２２が下降端に到達するまで鋳枠２１を下げる。これにより鋳枠２１の下面と鋳型下面を毎回ほぼ同一面にすることができる。 Next, when the squeeze pressure reaches the set pressure of the secondary squeeze, the squeeze stabilization timer is activated and the squeeze is maintained for a predetermined time. At this time, in order to cope with the case where the stopper cylinders 22, 22 have not reached the descending end, the conveyor lifting cylinders 19, 19 are extended to move the carry-in / out conveyors 20, 20, and the stopper cylinders 22, 22 are moved. The flask 21 is lowered until it reaches the lower end. As a result, the lower surface of the flask 21 and the lower surface of the mold can be made substantially the same each time.
次に鋳枠２１の動きを拘束した状態のまま、コンベヤ昇降シリンダ１９、１９により搬入出コンベヤ２０、２０を介して前記拘束された鋳枠２１と昇降支持フレ−ム３との動きを拘束して、枠セットシリンダ２、２を伸長作動させることにより抜型が成される。この際、スクイズフット１４、１４、盛枠１７、鋳枠２１、搬入出コンベヤ２０、２０及びコンベヤ昇降シリンダ１９、１９は一体的に上昇され、その際、下部補助枠７も一緒に上昇されるが、この下部補助枠７の上昇は、これらと一体的でなくても、一体的であっても、どちらでもよい。ただし、一体的に上昇させる場合は、下部補助枠シリンダ８、８には鋳枠２１が持ち上がらない圧力をかけるようにする。
その後、鋳型を造型した鋳枠２１は、スクイズフット１４、１４、盛枠１７、鋳枠２１、搬入出コンベヤ２０、２０及びコンベヤ昇降シリンダ１９、１９と一体となって上昇されてゆき、パタ−ンプレ−ト５から完全に分離されると共に鋳物砂Ｓが砂ホッパ１３内に補給される。
この際、造型された鋳型は、鋳枠２１と共に停止状態から若干上昇されて微速抜型されると共に枠セットシリンダ２、２のピストンロッド２Ａ、２Ａが最も縮引された状態で抜型されることから抜型精度が高いものになっている。
Next, while the movement of the casting flask 21 is restrained, the movement of the restrained casting flask 21 and the lifting support frame 3 is restrained by the conveyor lifting / lowering cylinders 19, 19 via the carry-in / out conveyors 20, 20. Then, the die is formed by extending the frame set cylinders 2 and 2. At this time, the squeeze feet 14, 14, the filling frame 17, the casting frame 21, the carry-in / out conveyors 20, 20, and the conveyor elevating cylinders 19, 19 are integrally raised, and at this time, the lower auxiliary frame 7 is also raised together. However, the raising of the lower auxiliary frame 7 may not be integral with them, or may be integral. However, in the case of integrally raising the lower auxiliary frame cylinders 8, 8, a pressure is applied so that the flask 21 does not lift.
Thereafter, the casting frame 21 in which the mold is formed is raised integrally with the squeeze feet 14, 14, the filling frame 17, the casting frame 21, the carry-in / out conveyors 20, 20, and the conveyor lifting / lowering cylinders 19, 19, and the The casting sand S is completely separated from the plate 5 and replenished into the sand hopper 13.
At this time, the molded mold is slightly lifted from the stopped state together with the casting frame 21 and is slowly released, and the piston rods 2A and 2A of the frame set cylinders 2 and 2 are removed in the most contracted state. High die-cutting accuracy.
次に盛枠シリンダ１８、１８の伸長作動により鋳型を造型した鋳枠２１の拘束された状態が解除されると共に下部補助枠シリンダ８、８の伸長作動により下部補助枠７が下降される。その後、鋳型を造型した鋳枠２１が搬入出コンベヤ２０、２０を介して搬出され、空の鋳枠２１が搬入されると共にパタ−ン交換装置４が図示されないアクチュエ−タにより１８０度回転されてパタ−ンプレ−ト５とパタ−ンプレ−ト５Ａとを入替え、さらにスクイズフット１４、１４が作動されてパタ−ンプレ−ト５Ａの凹凸に相対した凹凸に形成されて上記の作動を繰り返し行う。 Next, the restrained state of the casting frame 21 in which the mold is formed is released by the extension operation of the filling frame cylinders 18 and 18, and the lower auxiliary frame 7 is lowered by the extension operation of the lower auxiliary frame cylinders 8. Thereafter, the casting flask 21 in which the mold has been formed is carried out via the carry-in / out conveyors 20, 20, the empty casting flask 21 is carried in, and the pattern exchange device 4 is rotated 180 degrees by an actuator (not shown). The pattern plate 5 is replaced with the pattern plate 5A, and the squeeze feet 14, 14 are actuated to form irregularities corresponding to the irregularities of the pattern plate 5A, and the above operation is repeated.
なお、本発明の実施の形態では、パタ−ン交換装置４をタ−ンテ−ブル方式のものとして説明したが、枠セットシリンダ２、２の左右方向に対し直角方向に移動する方式がある。 In the embodiment of the present invention, the pattern exchange device 4 has been described as a turntable type. However, there is a method in which the frame set cylinders 2 and 2 are moved in a direction perpendicular to the left and right directions.
また、本発明の実施の形態では、流気加圧による鋳物砂の予備圧縮を行わないようにしたが、回転ゲ−ト、圧縮空気導入口等を設けて流気加圧による鋳物砂の予備圧縮を行うようにしてもよい。 Further, in the embodiment of the present invention, the preliminary compression of the molding sand by the pressurized air is not performed. However, the rotating gate, the compressed air inlet, and the like are provided to provide the preliminary compression of the molding sand by the pressurized air. Compression may be performed.
さらに、本発明の実施の形態では、砂ホッパ１３の下位周側及び下位内部から低圧エヤ−を噴出させて鋳物砂を浮遊流動化させるようにしたが、砂ホッパ１３の下位周側又は下位内部から低圧エヤ−を噴出させて鋳物砂を浮遊流動化させるようにしてもよい。 Further, in the embodiment of the present invention, the low-pressure air is jetted from the lower peripheral side and the lower inner side of the sand hopper 13 to float and fluidize the molding sand, but the lower peripheral side or the lower internal side of the sand hopper 13 is used. A low-pressure air may be blown out of the molding sand to float and fluidize the molding sand.
また、本発明の実施の形態では、多数のエヤ−噴出チャンバ−１２、１２に図示されない１個の切り替え弁を連通させるようにしたが、各々のエヤ−噴出チャンバ−１２、１２に各々の切り替え弁を設けて低圧エヤ−の噴出を部分的に調整するようにしてもよい。 Further, in the embodiment of the present invention, one switching valve (not shown) is connected to a number of the air-ejection chambers 12 and 12, but each of the air-ejection chambers 12 and 12 is connected to each switching valve. A valve may be provided to partially regulate the ejection of the low pressure air.
さらに、本発明の実施の形態では、ストッパ−シリンダ２２、２２を油圧シリンダとして説明したが、これに限定されるものではなく、電動シリンダ、エヤ−シリンダなどでもよい。 Furthermore, in the embodiment of the present invention, the stopper cylinders 22, 22 have been described as hydraulic cylinders. However, the present invention is not limited to this, and electric cylinders, air cylinders, and the like may be used.
５ パタ−ンプレ−ト
７ 下部補助枠
１４ スクイズフット
１７ 盛枠
２１ 鋳枠
Ｓ 鋳物砂
5 Pattern plate
7 Lower auxiliary frame
14 Squeeze Foot
17 Filling frame
21 Cast flask
S Foundry sand
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| JP2004227660A JP4096314B2 (en) | 2004-08-04 | 2004-08-04 | Molding method of sand mold with frame |
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| JP2000174159A Division JP3835667B2 (en) | 2000-04-13 | 2000-06-09 | Method and apparatus for forming sand mold with frame |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100789150B1 (en) | 2007-05-28 | 2007-12-28 | (주)일신금속 | Automatic transfer and press forming device for a mold-frame |
| WO2008149651A1 (en) * | 2007-06-01 | 2008-12-11 | Sintokogio, Ltd. | Equipment for molding mold with molding flask, and method for molding mold with molding flask |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100789150B1 (en) | 2007-05-28 | 2007-12-28 | (주)일신금속 | Automatic transfer and press forming device for a mold-frame |
| WO2008149651A1 (en) * | 2007-06-01 | 2008-12-11 | Sintokogio, Ltd. | Equipment for molding mold with molding flask, and method for molding mold with molding flask |
| JPWO2008149651A1 (en) * | 2007-06-01 | 2010-08-19 | 新東工業株式会社 | Molding equipment for casting mold with casting frame and molding method for casting mold with casting frame |
| JP4830022B2 (en) * | 2007-06-01 | 2011-12-07 | 新東工業株式会社 | Molding equipment for casting mold with casting frame and molding method for casting mold with casting frame |
| US8186416B2 (en) | 2007-06-01 | 2012-05-29 | Sintokogio, Ltd. | Equipment for molding mold with molding flask and method for molding mold with molding flask |
| EP2151290A4 (en) * | 2007-06-01 | 2016-11-02 | Sintokogio Ltd | Equipment for molding mold with molding flask, and method for molding mold with molding flask |
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