JP2017087288A - Casting device comprising control grid - Google Patents
Casting device comprising control grid Download PDFInfo
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- JP2017087288A JP2017087288A JP2015236100A JP2015236100A JP2017087288A JP 2017087288 A JP2017087288 A JP 2017087288A JP 2015236100 A JP2015236100 A JP 2015236100A JP 2015236100 A JP2015236100 A JP 2015236100A JP 2017087288 A JP2017087288 A JP 2017087288A
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Abstract
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, but particularly to a thin 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 occupy 80%, and the next is a cast hole, but the average value of the defective 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 apparatus described above, a defect is caused in the die-cast product due to the lack of 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 prevents defects in a die-cast product due to poor 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, in order to achieve the above object, a control grid is provided in a cavity of a mold through which a molten metal flows.
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 solution, a desired hot water can be obtained and defects due to poor hot water 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 failure is eliminated and the desired hot water supply can be realized, so that it is possible to eliminate defects in the die-cast product.
以下、本発明の実施の形態を図１に基づいて説明する。 Hereinafter, an embodiment 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, hatched portion 6 is a sectional view of the mold, and 7 is a streamline of the molten metal.
The molten metal flows in the direction of the arrow 7. 8 is a convex portion in the cavity, 9 is a concave portion, 10 is a circle, 11 is a puddle, degassing, and the like, 12 is a back portion that reaches 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.
Die casting alloys are mainly alloys of zinc, aluminum, and magnesium, but have different mechanical properties and physical properties.
In the context of the present invention, fluid viscosity is important.
The molten metal has viscosity as a physical property and exhibits a resistance property when it is deformed as a fluid. Viscosity causes friction in the flow and causes flow loss, resulting in an 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 decelerated.
Although this decelerated portion is called a boundary layer, it changes to a laminar boundary layer, a turbulent boundary layer, a turbulent flow, or 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 in various shapes, and the molten metal is in a state of branching, joining, shrinking, expanding, bending, etc. according to the shape. The flow in the vicinity of the wall surface is a boundary layer, a main flow outside the boundary layer, and a wake formed by the boundary layer and the main flow. However, in a portion having a circular cross section, two rows of vortex flows are generated downstream. In this Karman vortex street, a clockwise vortex and a counterclockwise vortex are generated.
A turbulent flow and a vortex flow are generated downstream of the convex portion, and a turbulent flow is generated at the inlet portion of the concave portion so that the deep portion 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 molten metal flow line is prevented by making the flow line of the molten metal into a desired state by the control grid shown in the example diagrams of 1, 2, 3, 4, and 5.
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 depends on the cavity inside the mold, and the molten metal passage is secured under the conditions of molten metal viscosity, flow velocity and flow rate.
The turbulent flow generated by the control grid is inevitable and allowed, and the streamline of the molten metal is controlled using the resistance generated by the turbulent flow.
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 steel is used in the example that remains as the structural material of the die-cast product. However, in the case where the change in the physical properties (such as electromagnetic characteristics) of the product is not preferable, the control grid is made of 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 that extends from the convex portion facing surface to the rear surface after the convex portion is installed so that the hot water failure on the rear surface of the convex portion does not occur due to the turbulent flow downstream of the convex portion 8.
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 circle 10, but the control grid 2 prevents the vortex street from being generated.
In the degassing and hot
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 described above, the control grid prevents turbulence and eddy currents that cause poor hot water, and also induces streamlines to the desired location, but the control grid is fixed using the mold structure. Alternatively, the position is not changed by the flow of the molten metal by being fixed to the inner wall of the mold. Desirably, the control grid swings in response to the melt flow, particularly in the example of preventing Karman vortex streets. By swinging the control grid, turbulent flow and vortex flow can be prevented, and poor hot water 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。Although the present invention is not limited to the above-described embodiment, it is effective in preventing poor hot water in thin aluminum die-cast products, and in products in which the electromagnetic characteristics can be ignored, the control grid is a structural material such as a steel wire, and the machine A die-cast product that has never existed in the past can be obtained by positively selecting a material to add physical and physical characteristics.
In that example, the shape and arrangement of the control grid are not limited to prevention of turbulence and the like, but can be used together to give new characteristics, and the shape and arrangement are devised. For example, based on the knowledge of fluid dynamics, the shape of the control grid is formed into a wave shape, causing resistance to flow around the molten metal, thickening the molten metal at that location, cooling the molten metal, In an example in which the location has a shape in which the flow velocity declines, the control grid may be formed in a radial shape, or may be formed in a vortex shape according to the flow direction of the molten metal to induce the molten metal around the molten metal.
The shape of the exemplified 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 molten metal.
It is desirable that it is fixed to the inner wall of the cavity or can be freely changed.
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,
Claims (1)
前記溶融合金（溶湯）が流れる金型のキャビティ内に所望の湯回りとする制御グリッドを内設することを特徴とする鋳造装置。In a casting machine that presses a molten alloy into a precise mold at a high temperature to produce a cast with high precision and high casting quality, control is performed so that a desired amount of molten metal is placed in the cavity of the mold through which the molten alloy (molten metal) flows. A casting apparatus comprising a grid.
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| JP2017087289A (en) * | 2015-11-17 | 2017-05-25 | 洋祐 佐藤 | Casting apparatus provided with control grid |
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| JPS5154833A (en) * | 1974-11-09 | 1976-05-14 | Nissan Motor | DAIKASUTO CHUZOHOHO |
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