JP6994696B2 - Casting equipment with control grid - Google Patents
Casting equipment with control grid Download PDFInfo
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- JP6994696B2 JP6994696B2 JP2015236100A JP2015236100A JP6994696B2 JP 6994696 B2 JP6994696 B2 JP 6994696B2 JP 2015236100 A JP2015236100 A JP 2015236100A JP 2015236100 A JP2015236100 A JP 2015236100A JP 6994696 B2 JP6994696 B2 JP 6994696B2
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Description
本発明は鋳造装置に関するものであるが特に薄肉アルミニウム系ダイカスト製品に関するものである。 The present invention relates to a casting apparatus, and more particularly to a thin-walled aluminum die-cast product.
従来のダイカスト製品は湯回り関係の欠陥が８０％を占め、次が鋳巣であるが各社の不良率の平均値は８．９％で極めて高率であった。 In conventional die-cast products, defects related to hot water supply account for 80%, followed by cavities, but the average defect rate of each company was 8.9%, which was extremely high.
以上に述べた鋳造装置では湯回り不良によってダイカスト製品に欠陥を生じさせていた。 In the casting equipment described above, the die casting product is defective due to poor running of the hot water.
本発明は、このような従来の構成が有していた問題を解決しようとするものであり、湯回り不良によってダイカスト製品に欠陥が生じるのを防止するものである。 The present invention is intended to solve the problems of such a conventional configuration, and is intended to prevent defects in the die-cast product due to poor running of the hot water.
そして、本発明は上記目的を達成するために溶湯が流れる金型のキャビティ内に制御グリッドを内設するものである。 In the present invention, a control grid is internally provided in the cavity of the mold through which the molten metal flows in order to achieve the above object.
上記解決手段によって所望の湯回りが得られ湯回り不良による欠陥を防止することができる。 By the above-mentioned solution, a desired hot water circulation can be obtained and defects due to poor hot water circulation can be prevented.
不測の湯回り不良がなくなり、所望の湯回りを実現できるのでダイカスト製品の欠陥を解消することが可能になる。 Unexpected hot water circulation defects can be eliminated, and the desired hot water circulation can be achieved, so that defects in die-cast products can be eliminated.
以下、本発明の実施の形態を図１に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to FIG.
図においては１、２、３、４、５は制御グリッド、斜線部６は金型の断面図、７は溶湯の流線。
溶湯は７の矢印方向に流れている。８はキャビティ内の凸部、９は凹部、１０は円形、１１は湯だまり、ガス抜きなど、１２は突き当たりとなる奥部である。In the figure, 1, 2, 3, 4, and 5 are control grids, the shaded area 6 is a cross-sectional view of a mold, and 7 is a streamline of molten metal.
The molten metal is flowing in the direction of the arrow 7. 8 is a convex portion in the cavity, 9 is a concave portion, 10 is a circular portion, 11 is a hot water pool, a gas vent, etc., and 12 is a deep portion at the end.
以下、上記構成の動作を説明する。
ダイカスト用合金は亜鉛、アルミニウム、マグネシウムを主とする合金であるが、それぞれ機械的性質、物理的性質が異なる。
本発明との関連では流体としての粘性が重要である。
溶湯は物性として粘性を有し、流体として変形を受けるときは抵抗する性質が表われる。粘性によって流れに摩擦を生じ流れ損失の原因となって非定常流れとなる。The operation of the above configuration will be described below.
Alloys for die casting are mainly alloys of zinc, aluminum, and magnesium, but their mechanical and physical properties are different.
Viscosity as a fluid is important in the context of the present invention.
The molten metal has a viscous physical characteristic and exhibits a property of resisting deformation as a fluid. The viscosity causes friction in the flow and causes flow loss, resulting in unsteady flow.
流体の粘性のために、金型の内壁面における流体の速度はゼロであるから壁面近くの流れは減速される。
この減速された部分を境界層というが、層流境界層、乱流境界層、乱流などに変化する。Due to the viscosity of the fluid, the velocity of the fluid on the inner wall surface of the mold is zero, so the flow near the wall surface is slowed down.
This decelerated part is called the boundary layer, and it changes into a laminar boundary layer, a turbulent boundary layer, a turbulent flow, and the like.
金型の内壁面は様々な形状によって形成され、溶湯は形状に従って分岐、合流、縮小、拡大、曲がりなどの状態となる。壁面近傍の流れは境界層、境界層の外の主流、境界層と主流によって形成される後流となるが、断面が円である箇所では下流に２列の渦流が生じる。このカルマン渦列では時計回りの渦と反時計回りの渦が生じる。
凸部の下流では乱流と渦流が生じ、凹部では入口部で乱流が生じて深部と溶湯が届かない。The inner wall surface of the mold is formed by various shapes, and the molten metal is in a state of branching, merging, shrinking, expanding, bending, etc. according to the shape. The flow near the wall surface is the boundary layer, the mainstream outside the boundary layer, and the wake formed by the boundary layer and the mainstream, but two rows of eddy currents occur downstream where the cross section is circular. In this Karman vortex street, a clockwise vortex and a counterclockwise vortex are generated.
Turbulence and vortex flow occur downstream of the convex portion, and turbulent flow occurs at the inlet portion of the concave portion, so that the deep part and the molten metal do not reach.
本発明では１、２、３、４、５の例図で示す制御グリッドによって溶湯の流線を所望の状態にすることによって湯回り不良を防止する。 In the present invention, the streamlines of the molten metal are brought into a desired state by the control grids shown in the examples of 1, 2, 3, 4, and 5, to prevent poor running of the molten metal.
制御グリッドの断面形状は円形、三角形、多角形など任意である。
サイズは金型内部のキャビティーに応じるものとし、溶湯の粘性、流速、流量の条件下で溶湯通路を確保する。
制御グリッドによって生じる乱流は不可避のもので許容するものとし、この乱流によって生じる抵抗を利用して溶湯の流線を制御する。The cross-sectional shape of the control grid is arbitrary, such as a circle, a triangle, or a polygon.
The size shall correspond to the cavity inside the mold, and the molten metal passage shall be secured under the conditions of viscosity, flow velocity and flow rate of the molten metal.
The turbulence generated by the control grid is unavoidable and tolerable, and the resistance generated by this turbulence is used to control the streamlines of the molten metal.
制御グリッドの素材は任意であるが、ダイカスト製品の構造材として残す例では鋼材などを用いるが、製品の物性（電磁気的特性など）の変化が好ましくない例では溶湯と同一の合金によって製作する。 The material of the control grid is arbitrary, but in the example of leaving it as the structural material of the die-cast product, steel material is used, but in the case where the change in the physical properties (electromagnetic characteristics, etc.) of the product is not preferable, it is manufactured by the same alloy as the molten metal.
凸部８の下流の乱流によって凸部背面の湯回り不良が生じないように制御グリッド１は凸部対面から凸部設置後面へ向伸させた形状とする。
凹部９では凹部入口部の乱流による湯回り不良を防止するために、入口部から深部へ制御グリッドを向伸させ溶湯の流線を誘引する。The control grid 1 has a shape extending from the facing surface of the convex portion to the rear surface where the convex portion is installed so that the turbulent flow downstream of the
In the
円形１０の下流ではカルマン渦列などが生じるが制御グリッド２によって渦列が生じないようにする。
ガス抜きや湯だまり部１１では制御グリッド３のように対面から制御グリッドを向伸させ溶湯の排出を促がす。
制御グリッド４は湯回り不良が生じやすい箇所へ流線を導くものである。A Karman vortex street or the like is generated downstream of the
In the degassing and the hot water pool portion 11, the control grid is extended from the face-to-face like the
The
上記のように制御グリッドは湯回り不良の原因となる乱流や渦流を防止する他、所望の箇所に流線を誘引するものであるが、制御グリッドは金型の構造を利用して固定させ、または金型内壁に固着させるなどによって溶湯の流れによって位置が変動しないようにする。望ましいのは、特にカルマン渦列を防止する例では、制御グリッドが溶湯の流れに応じて搖動することである。制御グリッドが搖動することによって、乱流や渦流を防止し、湯回り不良を防止できる。 As mentioned above, the control grid prevents turbulence and vortex flow that cause poor rotation of the hot water, and also attracts streamlines to desired locations, but the control grid is fixed using the structure of the mold. , Or by fixing it to the inner wall of the mold so that the position does not change due to the flow of the molten metal. Desirably, the control grid sways in response to the flow of the molten metal, especially in the example of preventing Karman vortices. By oscillating the control grid, turbulence and vortex flow can be prevented, and poor hot water circulation can be prevented.
本発明は上記実施例に限定されるものではないが、薄肉アルミニウムダイカスト製品の湯回り不良防止に効果があり、電磁気的特性を無視できる製品では制御グリッドを鋼線などの構造材とし、また機械的、物理的特性を付加するものとして積極的に素材を選択することによって従来にないダイカスト製品を得ることができる。
その例においては、制御グリッドの形状と配置は乱流などの防止にとどまるのではなく、あらたな特性を与えるものとして併用することができ、形状と配置が工夫されることになる。例として、流体力学の知見にもとづいて制御グリッドの形状を波形に形成しあえて抵抗を生じさせて溶湯の湯回りを滞流させ、当該箇所の溶湯を厚くすることや、溶湯の冷えや、当該箇所が流速が衰退する形状である例では、制御グリッドを放射線状にし、または、溶湯の流向に従って渦状に形成して溶湯の湯回りを誘引することなどもできる。
例示した制御グリッドの形状はキャビティ内部の形状に合わせて任意に組み合わせる。The present invention is not limited to the above embodiment, but in a product that is effective in preventing poor running of a thin-walled aluminum die-cast product and whose electromagnetic characteristics can be ignored, the control grid is used as a structural material such as a steel wire, and a machine is used. By positively selecting the material to add physical and physical characteristics, it is possible to obtain a die-cast product that has never existed before.
In that example, the shape and arrangement of the control grid can be used together not only to prevent turbulence, but also to give new characteristics, and the shape and arrangement will be devised. As an example, based on the knowledge of fluid mechanics, the shape of the control grid is formed into a corrugated shape, and resistance is intentionally generated to cause the flow around the molten metal to stagnate, thickening the molten metal at the relevant location, cooling the molten metal, and the like. In the example where the location has a shape in which the flow velocity declines, the control grid can be made radial, or formed in a spiral shape according to the flow direction of the molten metal to attract the circulation of the molten metal.
The shape of the illustrated control grid is arbitrarily combined according to the shape inside the cavity.
制御グリッドの断面の形状やサイズはキャビティ内部のサイズや、溶湯の湯回り改善に適応させて任意に変化させる。
キャビティ内壁に固着させるか、搖動可能とするかも任意に変化させることが望ましい。The shape and size of the cross section of the control grid can be arbitrarily changed according to the size inside the cavity and the improvement of the circulation of the molten metal.
It is desirable to arbitrarily change whether it is fixed to the inner wall of the cavity or it can be swung.
１、 制御グリッド
２、 制御グリッド
３、 制御グリッド
４、 制御グリッド
５、 制御グリッド
６、 金型
７、 溶湯の流線
８、 凸部
９、 凹部
１０、 円形
１１、 湯だまり、ガス抜き
１２、 奥部
１３、 制御グリッド1, control grid 2,
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| JP6994696B2 true JP6994696B2 (en) | 2022-01-14 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5154833B2 (en) | 2006-05-11 | 2013-02-27 | Ｎｔｎ株式会社 | Vibrating parts feeder |
| JP5392333B2 (en) | 2011-09-28 | 2014-01-22 | 日立化成株式会社 | Circuit connection adhesive, circuit connection method using the same, and connection body |
| JP2014223676A (en) | 2013-05-15 | 2014-12-04 | ゼネラル・エレクトリック・カンパニイ | Casting method, cast article and casting system |
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| JPS5154833A (en) * | 1974-11-09 | 1976-05-14 | Nissan Motor | DAIKASUTO CHUZOHOHO |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5154833B2 (en) | 2006-05-11 | 2013-02-27 | Ｎｔｎ株式会社 | Vibrating parts feeder |
| JP5392333B2 (en) | 2011-09-28 | 2014-01-22 | 日立化成株式会社 | Circuit connection adhesive, circuit connection method using the same, and connection body |
| JP2014223676A (en) | 2013-05-15 | 2014-12-04 | ゼネラル・エレクトリック・カンパニイ | Casting method, cast article and casting system |
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