JP2010188351A - Casting method - Google Patents

Casting method Download PDF

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JP2010188351A
JP2010188351A JP2009032314A JP2009032314A JP2010188351A JP 2010188351 A JP2010188351 A JP 2010188351A JP 2009032314 A JP2009032314 A JP 2009032314A JP 2009032314 A JP2009032314 A JP 2009032314A JP 2010188351 A JP2010188351 A JP 2010188351A
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casting
molten metal
cavity
pressure
sub
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JP5424384B2 (en
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Akio Miyamoto
晃雄 宮本
Arihiro Matsuo
有裕 松尾
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Daihatsu Motor Co Ltd
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Daihatsu Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a casting method by which a product portion can be molded without causing casting defects and also a casting apparatus can be downsized. <P>SOLUTION: Molten metal in a sub-cavity is solidified before an initial casting pressure is reached, by positively cooling the molten metal in the sub-cavity while a casting pressure is increased. Consequently, at the point of time when the initial casting pressure is reached, a molten metal pressure receiving area S is reduced by the solidified portion of the molten metal in the sub-cavity, enabling a mold clamping force F to be reduced that is for withstanding the initial casting pressure P<SB>0</SB>and enabling the casting equipment to be miniaturized. Although at this time there is a possibility that casting defects may occur because the molten metal in the sub-cavity solidifies in a low pressure state, it will not be a problem since the portion molded in the sub-cavity has no bearing upon the product. Then, after the initial casting pressure P<SB>0</SB>is reached, the molten metal in the main cavity is solidified, which enables a product portion to be molded without causing casting defects. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、鋳造方法に関する。   The present invention relates to a casting method.

一般に、鋳造は、金型に形成されたキャビティに溶湯を射出した後、所定の鋳造圧を加え、溶湯を凝固させることにより行われる。鋳造圧が低い状態で溶湯が凝固すると、溶湯に気泡等が混入したまま凝固し、製品部分に鋳造欠陥が生じる恐れがある。このため、溶湯を凝固させる際には、所定以上の鋳造圧を加えてキャビティ内の溶湯に混入した気泡を除去し、鋳造欠陥の生成を抑える必要がある。このとき、製品の品質を保証するために最低限必要とされる鋳造圧を「初期鋳造圧」と言う（以下、同様）。   In general, casting is performed by injecting molten metal into a cavity formed in a mold and then applying a predetermined casting pressure to solidify the molten metal. If the molten metal is solidified in a state where the casting pressure is low, the molten metal may be solidified with bubbles and the like mixed therein, which may cause casting defects in the product portion. For this reason, when solidifying the molten metal, it is necessary to apply a casting pressure of a predetermined level or more to remove bubbles mixed in the molten metal in the cavity to suppress the generation of casting defects. At this time, the minimum casting pressure required to guarantee the quality of the product is referred to as “initial casting pressure” (hereinafter the same).

金型に許容される最大鋳造圧Ｐｍａｘは、特許文献１に示されているように、金型の型締め力Ｆ、及び型開き方向の溶湯受圧面積Ｓを用いて、Ｐｍａｘ＝Ｆ／Ｓで表される。同文献では、鋳造圧が初期鋳造圧Ｐ０に達した後、キャビティ内の溶湯の凝固層の生成に応じて鋳造圧を高めることにより、最大鋳造圧Ｐｍａｘを高めることを可能としている。すなわち、キャビティ内の溶湯の凝固層が生成するにしたがって溶湯受圧面積Ｓが小さくなるため、この溶湯受圧面積Ｓが減少した分だけ最大鋳造圧Ｐｍａｘを大きくすることができる。 As shown in Patent Document 1, the maximum casting pressure P max allowed for the mold is determined by using the mold clamping force F and the molten metal pressure receiving area S in the mold opening direction, and P max = F / Represented by S. In this document, after the casting pressure reaches the initial casting pressure P 0 , the maximum casting pressure P max can be increased by increasing the casting pressure according to the generation of the solidified layer of the molten metal in the cavity. That is, since the molten metal pressure receiving area S decreases as the molten metal solidified layer in the cavity is generated, the maximum casting pressure P max can be increased by the amount of the decreased molten metal pressure receiving area S.

特開平７−６０４２７号公報Japanese Patent Laid-Open No. 7-60427

上記の鋳造方法では、少なくとも初期鋳造圧Ｐ０に耐え得る型締め力が必要となる。例えば、鋳造圧を加え始めてから初期鋳造圧Ｐ０に達するまでの間にも、上記と同様に、キャビティ内の溶湯の凝固層の生成に応じて鋳造圧を高めれば、初期鋳造圧Ｐ０に達する時には溶湯受圧面積Ｓが減っているため、型締め力Ｆを小さくすることができ、鋳造設備の小型化を図ることができる。しかし、この場合、鋳造圧が初期鋳造圧Ｐ０に満たない状態でキャビティ内の溶湯が凝固し始めるため、製品部分に鋳造欠陥が生じる恐れがある。 In the above casting method, a mold clamping force to withstand at least initial casting pressure P 0 is required. For example, if the casting pressure is increased according to the generation of the solidified layer of the molten metal in the cavity between the time when the casting pressure is started and the time when the initial casting pressure P 0 is reached, the initial casting pressure P 0 can be obtained. Since the molten metal pressure receiving area S is reduced when reaching, the mold clamping force F can be reduced, and the casting equipment can be downsized. However, in this case, since the molten metal in the cavity starts to solidify in a state where the casting pressure is less than the initial casting pressure P 0 , there is a possibility that casting defects may occur in the product portion.

本発明が解決しようとする課題は、鋳造欠陥を生じることなく製品部分を成形できると共に、鋳造設備を小型化することができる鋳造方法を提供することにある。   The problem to be solved by the present invention is to provide a casting method capable of forming a product portion without causing casting defects and reducing the size of the casting equipment.

前記課題を解決するために、本発明は、製品部分を成形する主キャビティと、主キャビティに連通し、製品以外の部分を成形する副キャビティとを有する金型を用いた鋳造方法であって、主キャビティ及び副キャビティ内に溶湯を満たした後、副キャビティ内の溶湯を冷却しながら鋳造圧を高め、初期鋳造圧に達するまでの間に副キャビティ内の溶湯の少なくとも一部を凝固させ、初期鋳造圧に達した後に主キャビティ内の溶湯を凝固させ始める鋳造方法を提供する。   In order to solve the above problems, the present invention is a casting method using a mold having a main cavity for molding a product part and a sub-cavity communicating with the main cavity and molding a part other than the product, After filling the main cavity and the sub-cavity with the molten metal, the casting pressure is increased while cooling the molten metal in the sub-cavity, and at least a part of the molten metal in the sub-cavity is solidified until the initial casting pressure is reached. A casting method is provided in which the molten metal in the main cavity begins to solidify after reaching the casting pressure.

このように、本発明の鋳造方法では、副キャビティ内の溶湯を冷却しながら鋳造圧を高めることで、初期鋳造圧Ｐ０に達するまでに副キャビティ内の溶湯を積極的に凝固させる。これにより、初期鋳造圧Ｐ０に達した時点で、副キャビティ内の溶湯が凝固した分だけ溶湯受圧面積Ｓが低減され、初期鋳造圧Ｐ０に耐え得るための型締め力Ｆ（＝Ｐ・Ｓ）を小さくすることができ、鋳造設備を小型化することができる。このとき、副キャビティ内の溶湯は低圧状態で凝固するため、鋳造欠陥が発生する恐れがあるが、副キャビティ内で成形される部分は製品とは関係がないため問題ない。そして、初期鋳造圧Ｐ０に達した後に、主キャビティ内の溶湯を凝固させ始めることにより、鋳造欠陥が発生させることなく製品部分を成形することができる。 As described above, in the casting method of the present invention, the molten metal in the sub-cavity is positively solidified until the initial casting pressure P 0 is reached by increasing the casting pressure while cooling the molten metal in the sub-cavity. Thus, upon reaching the initial casting pressure P 0, by the amount of molten metal in the sub-cavity has solidified melt pressure-receiving area S is reduced, the clamping force F to withstand the initial casting pressure P 0 (= P · S) can be reduced, and the casting equipment can be reduced in size. At this time, since the molten metal in the sub-cavity is solidified in a low pressure state, casting defects may occur. However, there is no problem because the portion formed in the sub-cavity is not related to the product. Then, after reaching the initial casting pressure P 0 , the product portion can be molded without causing casting defects by starting to solidify the molten metal in the main cavity.

以上のように、本発明の鋳造方法によれば、鋳造欠陥を生じることなく製品部分を成形できると共に、鋳造設備を小型化することができる。   As described above, according to the casting method of the present invention, the product portion can be molded without causing casting defects, and the casting equipment can be downsized.

図２のＹ−Ｙ線における金型の断面図である。It is sectional drawing of the metal mold | die in the YY line | wire of FIG. 固定型の正面図（図１のＸ−Ｘ線を矢印方向から見た図）である。FIG. 2 is a front view of a fixed mold (a view of the XX line of FIG. 1 viewed from the direction of an arrow). 図２のＺ−Ｚ線における金型の断面図である。It is sectional drawing of the metal mold | die in the ZZ line | wire of FIG. 鋳造圧Ｐの時間Ｔに対する変化を示すグラフである。It is a graph which shows the change to time T of casting pressure P.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１に示す鋳造金型１は、例えばダイカスト法による高圧鋳造を行うためのものであり、固定型１０と、固定型１０に対して移動可能な可動型２０とを有する。固定型１０及び可動型２０を型締めすると、金型内部に、製品部分を成形する主キャビティ３０と、製品以外の部分を成形する副キャビティとが形成される。副キャビティは、主キャビティと連通し、製品と関係の無い部分を成形するものであれば、その形状等は限定されない。本実施形態では、主キャビティ３０内を減圧するための減圧ランナ４０を副キャビティとして機能させている。また、図示例では、固定型１０及び可動型２０のそれぞれに、主キャビティ３０を構成するための凹部と、減圧ランナ４０を構成するための溝部とが形成され、これらの凹部あるいは溝部を型合わせすることにより、主キャビティ３０及び減圧ランナ４０が形成される。   A casting mold 1 shown in FIG. 1 is for performing high pressure casting by, for example, a die casting method, and includes a fixed mold 10 and a movable mold 20 movable with respect to the fixed mold 10. When the fixed mold 10 and the movable mold 20 are clamped, a main cavity 30 that molds a product part and a sub-cavity that molds a part other than the product are formed inside the mold. The shape or the like of the sub cavity is not limited as long as the sub cavity communicates with the main cavity and molds a part unrelated to the product. In this embodiment, the decompression runner 40 for decompressing the inside of the main cavity 30 is made to function as a sub cavity. Further, in the illustrated example, a recessed portion for forming the main cavity 30 and a groove portion for forming the decompression runner 40 are formed in each of the fixed mold 10 and the movable mold 20. By doing so, the main cavity 30 and the decompression runner 40 are formed.

減圧ランナ４０は、図２に示すように、主キャビティ３０の上部及び側部の複数箇所から延び、これらが一本にまとめられてチルベント５０に接続されている。チルベント５０は、図３に示すように、一対のチルベント部材５１・５２からなり、一方のチルベント部材５１が固定型１０に、他方のチルベント部材５２が可動型２０に固定される。固定型１０及び可動型２０を型締めすると、チルベント部材５１・５２の間に通路５３が形成される。各チルベント部材５１・５２の互いに対向する面には凹凸部が形成され、これらの凹凸部の間にジグザグに屈曲した通路５３が形成される。通路５３の外部側端部は、減圧手段（例えば真空ポンプ、図示省略）に接続され、この減圧手段を稼動すると、チルベント５０の通路５３及び減圧ランナ４０を介して主キャビティ３０内の空気が排出され、鋳造金型１の内部空間が減圧される。尚、減圧手段は、真空ポンプのように積極的にキャビティ内を減圧するものに限らず、例えば通路５３の外部側端部を大気と連通してキャビティ内の圧力を大気圧に維持する消極的な手段でもよい。   As shown in FIG. 2, the decompression runner 40 extends from a plurality of locations on the upper and side portions of the main cavity 30, and these are integrated together and connected to the chill vent 50. As shown in FIG. 3, the chill vent 50 includes a pair of chill vent members 51 and 52. One chill vent member 51 is fixed to the fixed mold 10 and the other chill vent member 52 is fixed to the movable mold 20. When the fixed mold 10 and the movable mold 20 are clamped, a passage 53 is formed between the chill vent members 51 and 52. Concave and convex portions are formed on the surfaces of the chill vent members 51 and 52 facing each other, and a passage 53 bent zigzag is formed between the concave and convex portions. The outer end of the passage 53 is connected to a decompression means (for example, a vacuum pump, not shown). When this decompression means is operated, the air in the main cavity 30 is discharged via the passage 53 of the chill vent 50 and the decompression runner 40. Then, the internal space of the casting mold 1 is decompressed. Note that the decompression means is not limited to the one that actively decompresses the inside of the cavity, such as a vacuum pump. Simple means may be used.

固定型１０には、主キャビティ３０に溶湯を供給するための湯道１１と、内部を冷媒が流通する冷却路とが形成される。本実施形態では、図２に示すように、２本の冷却路１２・１３が設けられる。冷却路１２・１３は、主キャビティ３０の上方に入口１２ａ・１３ａを有し、主キャビティ３０の両側の側方に回り込むように延びて、固定型１０の下方部分（図示例では主キャビティ３０よりも下方部分）に出口１２ｂ・１３ｂが開口している。これにより、主キャビティ３０の周りを囲むように冷却路１２・１３が配される。一方の冷却路１２は減圧ランナ４０の付近を通っており、具体的には減圧ランナ４０との最短距離Ｌ１が主キャビティ３０との最短距離Ｌ２よりも短くなっている（Ｌ１＜Ｌ２、図１参照）。図示例の一方の冷却路１２は、図２に示す正面視で、主キャビティ３０から延びた減圧ランナ４０を跨いで設けられる。   The fixed mold 10 is formed with a runner 11 for supplying the molten metal to the main cavity 30 and a cooling passage through which the refrigerant flows. In the present embodiment, as shown in FIG. 2, two cooling paths 12 and 13 are provided. The cooling passages 12 and 13 have inlets 12a and 13a above the main cavity 30, and extend so as to wrap around the sides of the main cavity 30. The lower portions of the fixed mold 10 (from the main cavity 30 in the illustrated example). Also, the outlets 12b and 13b are opened in the lower part. Thereby, the cooling paths 12 and 13 are arranged so as to surround the main cavity 30. One cooling path 12 passes through the vicinity of the decompression runner 40. Specifically, the shortest distance L1 to the decompression runner 40 is shorter than the shortest distance L2 to the main cavity 30 (L1 <L2, FIG. 1). reference). One cooling path 12 in the illustrated example is provided across the decompression runner 40 extending from the main cavity 30 in a front view shown in FIG.

上記構成の金型１を用いた鋳造方法を、以下に説明する。   A casting method using the mold 1 having the above configuration will be described below.

まず、固定型１０及び可動型２０を型締めして、主キャビティ３０、減圧ランナ４０、及びチルベント５０の通路５３を形成する。その後、減圧手段により主キャビティ３０を減圧しながら、湯道１１を介して主キャビティ３０内に溶湯を射出する。このように、主キャビティ３０内を減圧しながら溶湯を射出することにより、主キャビティ３０の細部まで溶湯を素早く行き渡らせることができると共に、空気の巻き込みを低減できる。また、射出当初の溶湯は、金型に付着したゴミや金属カスが混入しやすいため、このような不純物を含んだ溶湯を減圧ランナ４０内に引き込むことで、製品部分（主キャビティ３０）への不純物の混入を抑えることができる。   First, the fixed mold 10 and the movable mold 20 are clamped to form the main cavity 30, the decompression runner 40, and the passage 53 of the chill vent 50. Thereafter, the molten metal is injected into the main cavity 30 through the runner 11 while decompressing the main cavity 30 by the decompression means. In this way, by injecting the molten metal while reducing the pressure in the main cavity 30, the molten metal can be quickly distributed to the details of the main cavity 30, and the entrainment of air can be reduced. In addition, since the molten metal at the beginning of injection is liable to be mixed with dust and metal debris attached to the mold, the molten metal containing such impurities is drawn into the decompression runner 40 so that the product portion (main cavity 30) is introduced. Mixing of impurities can be suppressed.

主キャビティ３０に射出された溶湯が、減圧ランナ４０を通ってチルベント５０の通路５３まで達すると、一対のチルベント部材５１・５２に接触して冷却され、通路５３内で凝固する。これにより、主キャビティ３０に射出された溶湯が、減圧ランナ４０及び通路５３を介して鋳造金型１の外部に流出する事態を防止できる。   When the molten metal injected into the main cavity 30 reaches the passage 53 of the chill vent 50 through the decompression runner 40, the molten metal comes into contact with the pair of chill vent members 51 and 52 and is cooled and solidifies in the passage 53. Thereby, it is possible to prevent the molten metal injected into the main cavity 30 from flowing out of the casting mold 1 through the decompression runner 40 and the passage 53.

主キャビティ３０、減圧ランナ４０、及び湯道１１を含めた金型１の内部空間に溶湯が満たされたら、シリンダで溶湯を押し込んで鋳造圧を加え始める。このときの鋳造圧Ｐの時間Ｔに対する変化を図４に示す。図示のように、鋳造圧Ｐは、基準時Ｔ０から徐々に高められ、所定の圧力Ｐ１に達するまで時間Ｔの経過と共に無段階且つ連続的に単調増加する。 When the molten metal is filled in the inner space of the mold 1 including the main cavity 30, the decompression runner 40, and the runner 11, the molten metal is pushed into the cylinder and casting pressure is started. The change with respect to time T of the casting pressure P at this time is shown in FIG. As illustrated, the casting pressure P is gradually increased from the reference time T 0, steplessly and continuously increases monotonically with time T to reach a predetermined pressure P 1.

こうして鋳造圧を徐々に高めると共に、鋳造金型１を冷却する。具体的には、冷却路１２・１３の入口１２ａ・１３ａから冷媒（例えば水）を流入して固定型１０を冷却する。この冷却路１２・１３による冷却は、例えば基準時Ｔ０と同時に開始される。上記のように、冷却路１２・１３は、主キャビティ３０よりも減圧ランナ４０に近接して配されるため（Ｌ１＜Ｌ２、図１参照）、減圧ランナ４０が主キャビティ３０に対して相対的に冷却される。特に、本実施形態では、冷却路１２の二箇所の開口部１２ａ・１２ｂうち、減圧ランナ４０に近接した側（上側）の開口部１２ａから冷媒が流入されるため、流入されたばかりの低温の冷媒が減圧ランナ４０付近を通り、減圧ランナ４０がより一層冷却される。以上により、減圧ランナ４０内の溶湯が積極的に冷却され、初期凝固圧力Ｐ０に達するまでに少なくとも一部が凝固する（図４参照）。 Thus, the casting pressure is gradually increased and the casting mold 1 is cooled. Specifically, a coolant (for example, water) is introduced from the inlets 12 a and 13 a of the cooling passages 12 and 13 to cool the fixed mold 10. The cooling by the cooling passage 12, 13 is started at the same time as for example the reference time T 0. As described above, the cooling passages 12 and 13 are arranged closer to the decompression runner 40 than the main cavity 30 (L1 <L2, see FIG. 1), so that the decompression runner 40 is relative to the main cavity 30. To be cooled. In particular, in the present embodiment, the refrigerant flows in from the opening 12a on the side (upper side) close to the decompression runner 40 out of the two openings 12a and 12b of the cooling path 12, so that the low-temperature refrigerant just flowed in Passes through the vicinity of the decompression runner 40, and the decompression runner 40 is further cooled. As described above, the molten metal in the decompression runner 40 is actively cooled, and at least a part thereof is solidified until the initial solidification pressure P 0 is reached (see FIG. 4).

鋳造圧が初期鋳造圧Ｐ０に達した状態では、溶湯内に混入した気泡が溶湯に溶け込んで除去されている。このとき、金型の型締め力Ｆは、初期鋳造圧Ｐ０と溶湯受圧面積Ｓとの積よりも大きく設定する必要がある（Ｆ＞Ｐ０・Ｓ）。本発明の鋳造方法では、上記のように、鋳造圧が初期鋳造圧Ｐ０に達するまでに減圧ランナ４０内の溶湯の少なくとも一部が凝固しているため、この凝固した分だけ溶湯受圧面積Ｓが低減されている。従って、型締め力Ｆを小さくすることができ、型締めに要するシリンダ等の小型化、ひいては鋳造設備全体の小型化を図ることができる。 In a state where the casting pressure has reached the initial casting pressure P 0 , bubbles mixed in the molten metal are dissolved in the molten metal and removed. At this time, the mold clamping force F of the mold needs to be set larger than the product of the initial casting pressure P 0 and the molten metal pressure receiving area S (F> P 0 · S). In the casting method of the present invention, as described above, since at least a part of the molten metal in the decompression runner 40 is solidified until the casting pressure reaches the initial casting pressure P 0 , the molten metal pressure receiving area S is increased by this solidified amount. Has been reduced. Therefore, the mold clamping force F can be reduced, and the size of the cylinder and the like required for mold clamping can be reduced, and consequently the size of the entire casting equipment can be reduced.

その後、主キャビティ３０内の溶湯も冷却路１２・１３により十分に冷却され、凝固し始める（図４参照）。このとき、主キャビティ３０内の溶湯の凝固層の形成に応じて金型に許容される最大鋳造圧が高められるため、型締め力を大きくすることなく鋳造圧を所定値Ｐ１まで高めることができる。製品部分が完全に凝固したら、型開きされ、押し出し棒（図示省略）で製品を押し出して金型から製品が離脱される。 Thereafter, the molten metal in the main cavity 30 is also sufficiently cooled by the cooling paths 12 and 13 and begins to solidify (see FIG. 4). At this time, depending on the formation of molten metal solidification layers in the main cavity 30 for maximum casting pressure allowed is increased to the mold, to increase the casting pressure without increasing the clamping force to a predetermined value P 1 it can. When the product portion is completely solidified, the mold is opened, and the product is pushed out by an extrusion bar (not shown) to be removed from the mold.

図４に示すように、減圧ランナ内の溶湯は、初期鋳造圧Ｐ０に満たない低圧状態で凝固するため、鋳造欠陥が生じる恐れが高いが、この部分は製品とは関係のない廃棄される部分であるため、鋳造欠陥の生じても問題ない。一方、主キャビティ３０内の溶湯は、初期鋳造圧Ｐ０以上の鋳造圧の下で凝固するため、溶湯内に混入した空気が除去され、製品部分に鋳造欠陥が生じる恐れを回避できる。 As shown in FIG. 4, the molten metal in the decompression runner is solidified at a low pressure that is less than the initial casting pressure P 0 , so there is a high risk of casting defects, but this portion is discarded regardless of the product. Since it is a part, there is no problem even if casting defects occur. On the other hand, since the molten metal in the main cavity 30 is solidified under a casting pressure equal to or higher than the initial casting pressure P 0 , the air mixed in the molten metal is removed, and the risk of casting defects occurring in the product portion can be avoided.

本発明は上記の実施形態に限られない。例えば、上記に示した金型１に主キャビティ３０の溶湯を保温する保温手段を設ければ、初期鋳造圧Ｐ０に満たない状態で主キャビティ内の溶湯が凝固し始める事態を防止し、製品部分への鋳造欠陥の生成を確実に防止できる。保温手段としては、例えば、冷却水温コントロールする制御部を設けたり、主キャビティを構成する金型の成形面に保温効果の高い油性離型剤を塗布したりすることが考えられる。 The present invention is not limited to the above embodiment. For example, if the mold 1 shown above is provided with a heat retaining means for keeping the molten metal in the main cavity 30, it prevents the molten metal in the main cavity from starting to solidify in a state where the initial casting pressure P 0 is not reached. It is possible to reliably prevent casting defects from being generated on the part. As the heat retaining means, for example, a control unit for controlling the cooling water temperature may be provided, or an oil-based mold release agent having a high heat retaining effect may be applied to the molding surface of the mold constituting the main cavity.

また、上記の実施形態では、副キャビティが減圧ランナである場合を示しているが、これに限らず、外部と連通しない別個の副キャビティを金型内に形成してもよい。ただし、上記実施形態のようにダイカスト鋳造法では減圧ランナを設けられる場合が多いため、この減圧ランナを副キャビティとして有効に活用することが望ましい。   In the above embodiment, the sub cavity is a decompression runner. However, the present invention is not limited to this, and a separate sub cavity that does not communicate with the outside may be formed in the mold. However, since the die cast casting method is often provided with a decompression runner as in the above embodiment, it is desirable to effectively utilize this decompression runner as a sub-cavity.

１ 金型
１０ 固定型
１１ 湯道
１２・１３ 冷却路
２０ 可動型
３０ 主キャビティ
４０ 減圧ランナ（副キャビティ）
５０ チルベント
Ｐ 鋳造圧
Ｐ０ 初期鋳造圧
Ｔ 時間 1 Mold 10 Fixed mold 11 Runway 12/13 Cooling path 20 Movable mold 30 Main cavity 40 Depressurization runner (sub cavity)
50 Chill vent P Casting pressure P 0 Initial casting pressure T Time

Claims (1)

製品部分を成形する主キャビティと、主キャビティに連通し、製品以外の部分を成形する副キャビティとを有する金型を用いた鋳造方法であって、
主キャビティ及び副キャビティに溶湯を満たした後、副キャビティ内の溶湯を冷却しながら鋳造圧を高め、初期鋳造圧に達するまでの間に副キャビティ内の溶湯の少なくとも一部を凝固させ、初期鋳造圧に達した後に主キャビティ内の溶湯を凝固させ始める鋳造方法。 A casting method using a mold having a main cavity for molding a product part and a sub-cavity communicating with the main cavity and molding a part other than the product,
After filling the main cavity and sub-cavity with the molten metal, the casting pressure is increased while cooling the molten metal in the sub-cavity, and at least a part of the molten metal in the sub-cavity is solidified until the initial casting pressure is reached. A casting method that begins to solidify the molten metal in the main cavity after reaching pressure.
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Publication number Priority date Publication date Assignee Title
CN107931581A (en) * 2017-11-22 2018-04-20 中国船舶重工集团公司第十二研究所 The more echelon pressure regulation combined shaping methods of aluminum matrix composite
JP2020011289A (en) * 2018-07-20 2020-01-23 リョービ株式会社 Apparatus and method for die casting

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JP2008213003A (en) * 2007-03-06 2008-09-18 Toyota Motor Corp Die casting method and die casting machine

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JP2008213003A (en) * 2007-03-06 2008-09-18 Toyota Motor Corp Die casting method and die casting machine

Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN107931581A (en) * 2017-11-22 2018-04-20 中国船舶重工集团公司第十二研究所 The more echelon pressure regulation combined shaping methods of aluminum matrix composite
CN107931581B (en) * 2017-11-22 2019-06-21 中国船舶重工集团公司第十二研究所 The more echelon pressure regulation combined shaping methods of aluminum matrix composite
JP2020011289A (en) * 2018-07-20 2020-01-23 リョービ株式会社 Apparatus and method for die casting

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