JP2013215760A - Method for manufacturing aluminum alloy casting - Google Patents
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本発明は、金型によりアルミニウム合金鋳物を鋳造し、その鋳物をピンで押出して金型から離型するアルミニウム合金鋳物の製造方法に関する。 The present invention relates to a method for manufacturing an aluminum alloy casting in which an aluminum alloy casting is cast by a mold, the casting is extruded with a pin, and is released from the mold.
車両用ディスクホイールは、従来からスチールで形成されており、一部の高級車などではアルミニウム合金製のホイール（以下、単にアルミホイールともいう）が採用されていた。近年、車両の軽量化及び外観や意匠性の向上を目的として、アルミホイールを装着する割合が益々増大している。このアルミホイールは、タイヤを装着する環状のリム部、リム部の中心に形成されアルミホイールを車軸に装着する車輪用ボルトを挿通させるための複数のボルト孔を有するボス部、およびリム部とボス部とを連結するスポーク部とからなり、Ｓｉを６〜１３重量％程度含むＡｌ−Ｓｉ系合金を用いて、低圧鋳造、ダイカスト又はスクイズキャスティングなどの手段により製作されている。 Conventionally, a disc wheel for a vehicle has been formed of steel, and in some high-class vehicles, an aluminum alloy wheel (hereinafter also simply referred to as an aluminum wheel) has been adopted. In recent years, the proportion of mounting aluminum wheels has been increasing for the purpose of reducing the weight of vehicles and improving the appearance and design. This aluminum wheel has an annular rim portion for mounting a tire, a boss portion formed at the center of the rim portion and having a plurality of bolt holes for inserting a wheel bolt for mounting the aluminum wheel on an axle, and a rim portion and a boss portion. It is made by means of low pressure casting, die casting or squeeze casting, using an Al—Si based alloy containing about 6 to 13% by weight of Si.
従来、低圧鋳造機によりアルミホイールなどを鋳造する場合、保持炉に保持されたアルミ溶湯の自由表面に圧縮空気を印加することにより、溶湯はストーク内を上昇し、上型、下型、横型の３つの金型にて形成される金型製品部（キャビティー）に注入される。鋳造後、下型は低圧鋳造機の固定プラテンに固定されたままの状態でまず横型を開き、次に上型が取付けてある可動プラテンを支柱を介して摺動させることにより上昇させると、製品は上型に取付けられたまま上昇する。所定の距離だけ上昇すると、鋳造機に設けた押出し板に固定された押出しピンの先端が製品に突き当たり、製品を上型から押出して取外す。このとき、押出しピンは上型に設けたブッシュ孔内を摺動する。 Conventionally, when casting an aluminum wheel or the like with a low pressure casting machine, by applying compressed air to the free surface of the molten aluminum held in the holding furnace, the molten metal rises in the stalk, and the upper mold, the lower mold, and the horizontal mold It is injected into a mold product part (cavity) formed by three molds. After casting, the lower mold is fixed to the fixed platen of the low-pressure casting machine. First, the horizontal mold is opened, and then the movable platen with the upper mold attached is lifted by sliding it through the column. Rises while attached to the upper mold. When it rises by a predetermined distance, the tip of the extrusion pin fixed to the extrusion plate provided in the casting machine hits the product, and the product is pushed out from the upper mold and removed. At this time, the extrusion pin slides in a bush hole provided in the upper mold.
金型に溶湯が直接当たる部分は型温が非常に高くなる。この部分にブッシュを介して押出しピンを設けると押出す時は、焼付き、アルミによる溶損、アルミの付着、溶湯のさし込みなどの現象が生じて押出しピンの摺動が鈍くなる。押出しピンが動かないと製品が取り出せなかったり、サイクルタイムの伸びによる型温の低下、型温のバラツキにより鋳造条件が変わり不良が発生しやすいという問題点があった。 The mold temperature is very high in the part where the molten metal directly hits the mold. If an extrusion pin is provided in this portion via a bush, when extrusion is performed, phenomena such as seizure, melting damage due to aluminum, adhesion of aluminum, and insertion of molten metal occur, and the sliding of the extrusion pin becomes dull. There was a problem that the product could not be taken out unless the extrusion pin moved, the casting temperature changed due to the increase in cycle time, and the casting conditions changed due to the variation in the mold temperature, so that defects were likely to occur.
この問題点を解決するために特許文献１に記載のアルミニウム合金鋳物の製造方法は、押出しピンの内部に空気や水などの冷却媒体を流通させて押出しピンを強制冷却することにより、押出しピンの摺動がスムーズになり、サイクルタイムが安定し、かつ短縮され、整備工数が減少し、さらに鋳造不良が減少するとしている。 In order to solve this problem, the method for producing an aluminum alloy casting described in Patent Document 1 uses a cooling medium such as air or water to circulate inside the extrusion pin to forcibly cool the extrusion pin. It is said that sliding will be smooth, cycle time will be stable and shortened, maintenance man-hours will be reduced, and casting defects will be reduced.
特許文献１に示すように押出しピンを強制冷却してもブッシュと押出しピンとの隙間から溶湯が侵入すると、溶湯はブッシュの内周面や押出しピンの外周面にＡｌ付着層を形成する。この状態で押出しピンがブッシュに対して繰り返し摺動すると摩耗により押出しピンの外径が細くなり又はブッシュの内径が大きくなりブッシュと押出しピンとの隙間が徐々に大きくなる。この隙間が大きくなると多くの溶湯が侵入して、より大きいバリを形成する。大きなバリが形成されると押出しピンで製品を上型から押出して取外す際に、取外しにくくなるという不具合を生じる。 As shown in Patent Document 1, even if the extrusion pin is forcibly cooled, if the molten metal enters through the gap between the bush and the extrusion pin, the molten metal forms an Al adhesion layer on the inner peripheral surface of the bush and the outer peripheral surface of the extrusion pin. In this state, when the push pin repeatedly slides with respect to the bush, the outer diameter of the push pin is reduced due to wear or the inner diameter of the bush is increased, and the gap between the bush and the push pin is gradually increased. When this gap becomes large, a lot of molten metal enters and forms larger burrs. When a large burr is formed, there is a problem that it becomes difficult to remove the product when the product is pushed out from the upper die by the extrusion pin.
金型に溶湯を注入すると溶湯と直接接触するブッシュと押出しピンの先端部は溶湯とほぼ同じ温度まで上昇する。このときブッシュと押出しピンとの隙間を小さくして溶湯の侵入をできるだけ防ぐように設計すると、製品を離型する際は温度が下がっているため熱収縮により隙間は更に小さくなりカジリを生じやすく押出しピンをスムーズに摺動させることは困難である。製品を離型する際に押出しピンがスムーズに摺動するようにブッシュと押出しピンとの隙間を設計すると、高温時は熱膨張により隙間がより大きくなるため多くの溶湯が侵入して、より大きいバリを形成しやすい。 When the molten metal is poured into the mold, the bushes that are in direct contact with the molten metal and the tips of the extrusion pins rise to substantially the same temperature as the molten metal. If the design is such that the gap between the bush and the extrusion pin is reduced to prevent the intrusion of the molten metal as much as possible, the temperature drops when the product is released. Is difficult to slide smoothly. When the clearance between the bush and the extrusion pin is designed so that the extrusion pin slides smoothly when the product is released, the gap becomes larger due to thermal expansion at high temperatures, so that a large amount of molten metal enters and becomes larger. Easy to form.
本発明は以上の問題点に鑑みてなされたもので、ブッシュと押出しピンとの隙間への溶湯の侵入によって生じるバリを小さくでき、且つ製品を離型する際に押出しピンがスムーズに摺動することのできるアルミニウム合金鋳物の製造方法を提供することを目的とする。 The present invention has been made in view of the above problems, and it is possible to reduce the burrs generated by the intrusion of the molten metal into the gap between the bush and the extrusion pin, and the extrusion pin slides smoothly when releasing the product. An object of the present invention is to provide a method for producing an aluminum alloy casting that can be manufactured.
上記の目的を達成するために本願発明のアルミニウム合金鋳物の製造方法は、金型で囲まれてなるキャビティー内に前記金型に設けた湯口を通じてアルミニウム合金の溶湯を注湯し、前記溶湯が冷却固化してできたアルミニウム合金鋳物を金型のキャビティーに臨む位置に設けたブッシュに対して摺動する押出しピンで押して前記金型から取り出すアルミニウム合金鋳物の製造方法であって、前記押出しピンの熱膨張係数は、前記ブッシュの熱膨張係数より大きいという技術的手段を採用した。 In order to achieve the above object, a method for producing an aluminum alloy casting according to the present invention is such that a molten aluminum alloy is poured into a cavity surrounded by a mold through a gate provided in the mold, A method for producing an aluminum alloy casting, in which an aluminum alloy casting formed by cooling and solidification is pushed out by an extrusion pin that slides against a bush provided at a position facing a cavity of the die and is taken out from the die. The technical means that the thermal expansion coefficient of is greater than the thermal expansion coefficient of the bush was adopted.
本願発明のアルミニウム合金鋳物の製造方法においては、前記押出しピンは高速度工具鋼で形成し、前記ブッシュは超硬合金から形成することが好ましい。 In the method for producing an aluminum alloy casting according to the present invention, it is preferable that the extrusion pin is made of high-speed tool steel and the bush is made of cemented carbide.
本願発明において、前記押出しピンは、前記ブッシュと摺動する面に窒化膜からなる下地層を形成し該下地層の上にＣｒ系皮膜からなる硬質層を形成したものであることが好ましい。前記硬質層は１層とすることが好ましい。 In this invention, it is preferable that the said extrusion pin forms the base layer which consists of a nitride film in the surface which slides with the said bush, and forms the hard layer which consists of Cr-type film | membrane on this base layer. The hard layer is preferably a single layer.
本願発明は上記の技術的手段を採用しているため、製品を離型する際に押出しピンがスムーズに摺動するようにブッシュと押出しピンとの隙間を設計しても、高温時の熱膨張によって隙間が大きくなることなく低温時の隙間がほぼ維持されるため、金型に溶湯を注入した時も溶湯の侵入を抑制することができバリを最小限に留めることができる。 Since the present invention employs the above technical means, even if the gap between the bush and the extrusion pin is designed so that the extrusion pin slides smoothly when releasing the product, Since the gap at the low temperature is substantially maintained without increasing the gap, the molten metal can be prevented from entering even when the molten metal is poured into the mold, and the burr can be kept to a minimum.
高温時には押出しピンは熱膨張して外径が大きくなり、ブッシュも熱膨張して内径が大きくなる。そのとき両者の熱膨張率が同じであれば押出しピンの外径またはブッシュの内径に対する押出しピンの外径とブッシュの内径の隙間の比率は維持されるが隙間の絶対値は大きくなる。本願発明では、押出しピンをブッシュの熱膨張係数より大きい熱膨張係数を有する材料で形成したから、例えば製品取出し時の低い温度で押出しピンとブッシュとの隙間を押出しピンがスムーズに摺動することのできる隙間に設計しても、金型に溶湯を注入した時にブッシュの内径の膨張量より押出しピンの外径の膨張量が大きくなり両者の高温時の隙間の絶対値はほぼ維持されることから溶湯の侵入を抑制することができ、バリを最小限に留めることができる。押出しピンの熱膨張係数とブッシュの熱膨張係数は押出しピンの外径、ブッシュの内径、溶湯温度、製品取出し時の温度等によって適宜決めることができる。 When the temperature is high, the extrusion pin is thermally expanded to increase the outer diameter, and the bush is also thermally expanded to increase the inner diameter. At that time, if the coefficient of thermal expansion of both is the same, the ratio of the gap between the outer diameter of the push pin and the inner diameter of the bush with respect to the outer diameter of the push pin or the inner diameter of the bush is maintained, but the absolute value of the gap increases. In the present invention, since the extrusion pin is formed of a material having a thermal expansion coefficient larger than that of the bush, for example, the extrusion pin can smoothly slide through the gap between the extrusion pin and the bush at a low temperature when the product is taken out. Even if the gap can be designed, when the molten metal is poured into the mold, the expansion amount of the outer diameter of the push pin is larger than the expansion amount of the inner diameter of the bush, and the absolute value of the clearance at both high temperatures is almost maintained. Intrusion of the molten metal can be suppressed, and burrs can be minimized. The thermal expansion coefficient of the extruding pin and the thermal expansion coefficient of the bush can be appropriately determined depending on the outer diameter of the extruding pin, the inner diameter of the bush, the molten metal temperature, the temperature at the time of product removal, and the like.
本願発明においては、ブッシュを超硬合金で形成し、押出しピンを超硬合金より大きい熱膨張係数を有する高速度工具鋼で形成することにより、低温時の押出しピンとブッシュとの隙間は高温時でも維持されるとともに、高温時の使用においても耐摩耗性に優れるという効果がある。 In the present invention, by forming the bush with a cemented carbide and forming the extrusion pin with a high-speed tool steel having a thermal expansion coefficient larger than that of the cemented carbide, the clearance between the extrusion pin and the bush at a low temperature is high. In addition to being maintained, there is an effect that the wear resistance is excellent even when used at a high temperature.
本願発明において、前記押出しピンは、前記ブッシュと摺動する面に窒化膜からなる下地層を形成し該下地層の上にＣｒ系皮膜からなる硬質層を形成する構成を採用することは、本発明の効果をより多くの鋳造ショット数に亘って維持することを可能とするため好ましい。また、前記硬質層を１層とすることは、本発明の効果を更に多くの鋳造ショット数に亘って維持することを可能とするため、より好ましい。硬質層を２層以上とすると硬質皮膜層間の密着性が必ずしも十分ではないため本発明の効果を長期間維持しにくい。 In the present invention, the extrusion pin adopts a configuration in which a base layer made of a nitride film is formed on a surface sliding with the bush and a hard layer made of a Cr-based film is formed on the base layer. This is preferable because the effect of the invention can be maintained over a larger number of casting shots. Moreover, it is more preferable to make the said hard layer into one layer, since it becomes possible to maintain the effect of this invention over many more casting shot numbers. If the number of hard layers is two or more, the adhesiveness between the hard coating layers is not always sufficient, and it is difficult to maintain the effects of the present invention for a long time.
以下、実施例により本発明を説明するが、それら実施例により本発明が限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited by these Examples.
図１を用いて説明する。低圧鋳造機によりアルミホイールなどを鋳造する場合、保持炉に保持されたアルミ溶湯の自由表面に圧縮空気を印加することにより、溶湯はストーク内を上昇し湯口６を経て、上型７、下型９、横型１０の３つの金型にて形成される金型製品部（キャビティー）に注入される。鋳造後、下型９は低圧鋳造機の固定プラテンに固定されたままの状態でまず横型１０を開き、次に上型７が取付けである可動プラテンを支柱を介して摺動させることにより上昇させると、製品１１は上型７に取付けられたまま上昇する。所定の距離だけ上昇すると、鋳造機に設けた押出し板に固定された押出しピン１の先端が製品１１に突き当たり、製品１１を上型７から押出して取外す。このとき、押出しピン１は上型７に設けたブッシュ８の孔の内周面に対して摺動する。本発明において鋳造用金型に取り付けて使用するブッシュは硬度が高く耐磨耗性を要求されるため超硬合金が好適であり、押出しピンは曲げ強度が特に重要であるため高速度工具鋼が好適である。 This will be described with reference to FIG. When casting an aluminum wheel or the like with a low-pressure casting machine, by applying compressed air to the free surface of the molten aluminum held in the holding furnace, the molten metal rises in the stalk and passes through the gate 6 to the upper mold 7 and the lower mold. 9. It is injected into a mold product part (cavity) formed by three molds of the horizontal mold 10. After casting, the lower mold 9 is first lifted by opening the horizontal mold 10 while being fixed to the fixed platen of the low-pressure casting machine, and then sliding the movable platen to which the upper mold 7 is attached through the support column. Then, the product 11 rises while being attached to the upper mold 7. When it rises by a predetermined distance, the tip of the extrusion pin 1 fixed to the extrusion plate provided in the casting machine hits the product 11, and the product 11 is pushed out from the upper mold 7 and removed. At this time, the push pin 1 slides with respect to the inner peripheral surface of the hole of the bush 8 provided in the upper mold 7. In the present invention, the bush used to be attached to the casting mold is required to have high hardness and wear resistance, and therefore, a cemented carbide is preferable. For the extrusion pin, the bending strength is particularly important. Is preferred.
以下、本発明の実施例について述べる。 Examples of the present invention will be described below.
（実施例１）
図示しない低圧鋳造機および図１に示す金型を使用してアルミホイールを鋳造した。図１の押出しピン１とブッシュ８を含む周辺部分の拡大図を図２に示す。押出しピン１とブッシュ８はそれぞれ表１に示す材料で形成した。アルミホイールの取出し時の温度を約530〜550℃とし、その温度で押出しピン１とブッシュ８との隙間Ｇが約0.14〜0.18ｍｍとなるように押出しピンの外径とブッシュの内径を設計した。この隙間Ｇは押出しピンがブッシュ内周面をスムーズに摺動できる隙間で最も小さい隙間とした。金型にアルミニウム溶湯を注入するとブッシュ８の内径の膨張量より押出しピン１の外径の膨張量が大きくなり両者の高温時の隙間Ｇの絶対値はほぼ維持されることから隙間Ｇへの溶湯の侵入を抑制することができバリを最小限に留めることができた（図２（ａ））。溶湯注入時に押出しピン１の先端とブッシュ８は一時的に最も高温になり、熱膨張量も最も大きくなる。このときの隙間Ｇが製品取出し時の隙間より小さくなったとしても、この状態で押出しピン１を摺動させることはないのでカジリが生じることはない。
Example 1
Aluminum wheels were cast using a low-pressure casting machine (not shown) and a mold shown in FIG. FIG. 2 shows an enlarged view of a peripheral portion including the extrusion pin 1 and the bush 8 of FIG. The extrusion pin 1 and the bush 8 were formed of the materials shown in Table 1, respectively. The outer diameter of the push pin and the inner diameter of the bush are designed so that the temperature when the aluminum wheel is taken out is about 530 to 550 ° C. and the gap G between the push pin 1 and the bush 8 is about 0.14 to 0.18 mm at that temperature. . This gap G was the smallest gap in which the push pin can smoothly slide on the inner peripheral surface of the bush. When molten aluminum is poured into the mold, the expansion amount of the outer diameter of the push pin 1 becomes larger than the expansion amount of the inner diameter of the bush 8, and the absolute value of the gap G at the high temperature of both is substantially maintained. The intrusion of the material can be suppressed and the burr can be minimized (FIG. 2 (a)). At the time of pouring the molten metal, the tip of the extrusion pin 1 and the bush 8 temporarily become the highest temperature, and the amount of thermal expansion becomes the largest. Even if the gap G at this time becomes smaller than the gap at the time of taking out the product, the push pin 1 is not slid in this state, so that no galling occurs.
溶湯の温度が低下して凝固し金型からアルミホイールを取り出せる温度になったら押出しピン１を突き出してアルミホイール１１を金型（上型７）から取り出す。押出しピン１の摺動はスムーズであった。アルミホイールのバリ１２は非常に小さく、上型７から取外しにくくなることはなかった（図２（ｂ））。なお、押出しピンが押す箇所はアルミホイールを車軸に装着する車輪用ボルトを挿通させるためのボルト孔を形成する部位であるから鋳造後の孔加工と同時にバリも除去される。したがって鋳造後のアルミホイールに多少のバリがあっても問題はない。 When the temperature of the molten metal drops and solidifies to a temperature at which the aluminum wheel can be removed from the mold, the extrusion pin 1 is protruded and the aluminum wheel 11 is removed from the mold (upper mold 7). The slide of the extrusion pin 1 was smooth. The burrs 12 of the aluminum wheel were very small and did not become difficult to remove from the upper mold 7 (FIG. 2B). In addition, since the location where the extrusion pin pushes is a site | part which forms the bolt hole for inserting the bolt for wheels which mounts an aluminum wheel to an axle shaft, a burr | flash is also removed simultaneously with the hole processing after casting. Therefore, there is no problem even if the cast aluminum wheel has some burrs.
（実施例２）
押出しピン１のブッシュ８と摺動する面に表２に示す仕様のコーティングを施したことを除き実施例１と同様にしてアルミホイールを作製した。評価はアルミホイールの作製数（ショット数）と押出しピンの直径の変化率（％）の関係を求めた。変化率が一定値を超えると隙間Ｇが大きくなりバリが大きくなる。
(Example 2)
An aluminum wheel was produced in the same manner as in Example 1 except that the surface of the extrusion pin 1 sliding with the bush 8 was coated with the specifications shown in Table 2. In the evaluation, the relationship between the number of manufactured aluminum wheels (number of shots) and the rate of change (%) in the diameter of the extrusion pin was obtained. When the rate of change exceeds a certain value, the gap G increases and the burr increases.
押出しピンの直径の変化率は式１の定義に従い、押出しピン先端から５ｍｍ，１５ｍｍ，３０ｍｍの３箇所でそれぞれ求めて、それらの平均値とした。直径を測定する前に押出しピンを苛性ソーダに浸漬して付着したアルミニウムを除去した。 The rate of change in the diameter of the extrusion pin was determined at three locations of 5 mm, 15 mm, and 30 mm from the tip of the extrusion pin according to the definition of Equation 1, and the average value thereof was obtained. Prior to measuring the diameter, the extruded pin was immersed in caustic soda to remove the adhered aluminum.
図３は、表2に示す各コーティングについて、鋳造ショット数と押し出しピン直径の変化率の関係を評価した結果を示したものである。下地層と硬質層の構造とすることで、カジリを抑制し、鋳造ショット数を維持することができる。No.3の下地層と硬質層（2層）の3層構造の押し出しピンでは約25,000ショットで変化率の上昇がみられるが実用可能である。No.1,2の下地層と硬質層の2層構造の押し出しピンは、No.3の押し出しピンより安定したショット数を維持することが可能である。 FIG. 3 shows the results of evaluating the relationship between the number of casting shots and the rate of change of the extrusion pin diameter for each coating shown in Table 2. By using the structure of the base layer and the hard layer, galling can be suppressed and the number of casting shots can be maintained. With the No. 3 extrusion layer with a three-layer structure consisting of an underlayer and a hard layer (two layers), the rate of change increases in about 25,000 shots, but it is practical. The extrusion pin with the two-layer structure of No. 1 and 2 underlayer and hard layer can maintain a more stable number of shots than the No. 3 extrusion pin.
１：押出しピン
６：湯口
７：上型
８：ブッシュ
９：下型
１０：横型
１１：製品（アルミホイール）
１２：バリ
Ｇ：隙間
1: Extrusion pin 6: Gate 7: Upper mold 8: Bush 9: Lower mold 10: Horizontal mold 11: Product (aluminum wheel)
12: Burr G: Gap
Claims (4)
前記押出しピンの熱膨張係数は、前記ブッシュの熱膨張係数より大きいことを特徴とするアルミニウム合金鋳物の製造方法。 A molten aluminum alloy is poured into a cavity surrounded by the mold through a sprue provided in the mold, and the aluminum alloy casting formed by cooling and solidifying the molten metal is located at a position facing the cavity of the mold. A method for producing an aluminum alloy casting that is pushed out by an extrusion pin that slides against a provided bush and is taken out of the mold,
The method for producing an aluminum alloy casting, wherein a thermal expansion coefficient of the extrusion pin is larger than a thermal expansion coefficient of the bush.
The manufacturing method of the aluminum alloy casting of Claim 3 which makes the said hard layer 1 layer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057636A (en) * | 2015-07-30 | 2015-11-18 | 惠州市威盛工业有限公司 | Steel bushing inlay casting method for motor casing front and rear end covers and front and rear end covers |
| JP2017170469A (en) * | 2016-03-23 | 2017-09-28 | 株式会社デンソー | Casting apparatus and manufacturing method for cast product |
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| JPS6293056A (en) * | 1985-10-18 | 1987-04-28 | Hitachi Metals Ltd | Product ejecting implement for die casting |
| JPH0456749A (en) * | 1990-06-22 | 1992-02-24 | Hitachi Metals Ltd | Die for casting or apparatus to be brought into contact with molten metal excellent in erosion resistance |
| JP2001150098A (en) * | 1999-11-24 | 2001-06-05 | Kohan Kogyo Kk | Alloy casting die |
| JP2008068303A (en) * | 2006-09-15 | 2008-03-27 | Nissan Motor Co Ltd | Molding apparatus, extrusion pin, and molding method |
| JP2008221220A (en) * | 2007-03-08 | 2008-09-25 | Hitachi Metals Ltd | Spool bush for die casting machine |
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| JPS6293056A (en) * | 1985-10-18 | 1987-04-28 | Hitachi Metals Ltd | Product ejecting implement for die casting |
| JPH0456749A (en) * | 1990-06-22 | 1992-02-24 | Hitachi Metals Ltd | Die for casting or apparatus to be brought into contact with molten metal excellent in erosion resistance |
| JP2001150098A (en) * | 1999-11-24 | 2001-06-05 | Kohan Kogyo Kk | Alloy casting die |
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| CN105057636A (en) * | 2015-07-30 | 2015-11-18 | 惠州市威盛工业有限公司 | Steel bushing inlay casting method for motor casing front and rear end covers and front and rear end covers |
| JP2017170469A (en) * | 2016-03-23 | 2017-09-28 | 株式会社デンソー | Casting apparatus and manufacturing method for cast product |
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