JP2849312B2 - High pressure casting method - Google Patents
High pressure casting methodInfo
- Publication number
- JP2849312B2 JP2849312B2 JP21571393A JP21571393A JP2849312B2 JP 2849312 B2 JP2849312 B2 JP 2849312B2 JP 21571393 A JP21571393 A JP 21571393A JP 21571393 A JP21571393 A JP 21571393A JP 2849312 B2 JP2849312 B2 JP 2849312B2
- Authority
- JP
- Japan
- Prior art keywords
- casting
- pressure
- mold
- molten metal
- casting pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属溶湯を射出機構に
よって金型内に充填し高圧下で鋳造する高圧鋳造方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure casting method in which molten metal is filled in a mold by an injection mechanism and cast under high pressure.
【０００２】[0002]
【従来の技術】高圧鋳造機を使用して鋳造する場合、そ
の鋳造機の型締め力と型開き方向に対する金型溶湯受圧
面積とによって、鋳造圧力の上限が決まる。即ち、鋳造
圧力の上限は、型締め力を金型溶湯受圧面積で除した値
になる。実際に鋳造を行う場合には、図４に示すよう
に、注湯，射出充填後に鋳造圧力上限Ｐmax 未満の鋳造
圧力で鋳造を行うのが普通である。このように、高圧鋳
造での鋳造圧力は、鋳造機の型締め力と金型キャビティ
（空洞部分）形状により制約を受けることが明らかであ
る。2. Description of the Related Art When casting is performed using a high-pressure casting machine, the upper limit of casting pressure is determined by the mold clamping force of the casting machine and the area of the molten metal receiving pressure in the mold opening direction. That is, the upper limit of the casting pressure is a value obtained by dividing the mold clamping force by the molten metal receiving pressure area. In actual casting, as shown in FIG. 4, it is common practice to perform casting at a casting pressure less than the casting pressure upper limit Pmax after pouring and injection filling. Thus, it is clear that the casting pressure in the high-pressure casting is restricted by the mold clamping force of the casting machine and the shape of the mold cavity (cavity portion).
【０００３】[0003]
【発明が解決しようとする課題】鋳造製品が大型・厚肉
になってくると、型締め力や鋳造圧力が充分でなかった
りして、製品内部に鋳造欠陥を生じたり、所定の機械的
性質が確保されなかったりする場合が多々あり、従っ
て、製品の形態に応じた必要な鋳造圧力を負荷するとと
もに、鋳造圧力とキャビティ投影面積との積に応じて鋳
造機の型締め力を大きくする必要が生じて鋳造機が大型
になる。さらにこの場合、同じキャビティ形状に対し、
型締め力による金型弾性変形を最小限にするために、製
品に応じた所要の鋳造圧力を始めから負荷するととも
に、金型を大型化する必要があり、金型材料に対しても
非効率的となる問題は避けられなかった。When the cast product becomes large and thick, the mold clamping force and the casting pressure are not sufficient, resulting in a casting defect inside the product and a certain mechanical property. Therefore, it is necessary to apply the necessary casting pressure according to the form of the product, and to increase the mold clamping force of the casting machine according to the product of the casting pressure and the projected area of the cavity. And the casting machine becomes large. Furthermore, in this case, for the same cavity shape,
In order to minimize the mold elastic deformation due to the mold clamping force, it is necessary to apply the required casting pressure according to the product from the beginning, and it is necessary to enlarge the mold, which is inefficient for the mold material Targeted issues were inevitable.
【０００４】本発明は、このような問題点の解消を図る
ために成されたものであり、本発明の目的は、高圧鋳造
機及び金型の構造のコンパクト化を図ると共に、鋳造製
品の品質向上並びに機械的性質の安定保持を果たさせる
高圧鋳造方法を提供することである。The present invention has been made to solve such problems, and an object of the present invention is to reduce the size of a high-pressure casting machine and a mold and to improve the quality of a cast product. An object of the present invention is to provide a high-pressure casting method capable of improving and maintaining stable mechanical properties.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記の目的を
達成するため以下に述べる構成としたものである。即
ち、本発明は、金属溶湯を射出機構によって金型キャビ
ティ内に充填した後、前記金属溶湯に鋳造圧力を加えて
鋳造を行う高圧鋳造方法において、鋳造を開始し、鋳造
圧力が初期設定鋳造圧力ＰO に達した後、前記金型キャ
ビティ内の金属溶湯の凝固層の生成に応じて、該生成と
ともに上昇する鋳造圧力上限Ｐmax を超えない範囲で、
前記鋳造圧力を段階的または無段階的に上げて鋳造を行
うことを特徴とする高圧鋳造方法である。The present invention has the following configuration to achieve the above object. That is, the present invention provides a high-pressure casting method in which a molten metal is filled into a mold cavity by an injection mechanism, and then a casting pressure is applied to the molten metal to perform casting. after reaching P O, depending on the generation of the solidified layer of molten metal within the mold cavity, and the product
As long as the casting pressure does not exceed the upper limit Pmax,
A high-pressure casting method, wherein the casting pressure is increased stepwise or steplessly to perform casting.
【０００６】[0006]
【作用】本発明に従えば、金属溶湯を金型キャビティ内
に射出機構により充填した後に、鋳造を開始して鋳造圧
力が初期設定鋳造圧力ＰO に達すると、金型キャビティ
内の金属溶湯の凝固層の生成に応じて、前記鋳造圧力を
上げて鋳造を行わせる。この場合の初期設定鋳造圧力Ｐ
O は、前述するように、鋳造機の型締め力と型開き方向
に対する金型溶湯受圧面積とを要素とした装置条件によ
って決まる鋳造圧力上限Ｐmax 以下の一定圧力である。
鋳造の進行に伴って、金型キャビティ内の金属溶湯は金
型に接する外側部分において凝固層が生成するため、キ
ャビティ内の残存溶湯は、凝固層を除く量に減じ、これ
に伴って型開き方向に対する金型内溶湯受圧面積は小さ
くなり、従って、鋳造圧力上限Ｐmax は凝固層の生成と
ともに大きくなる。本発明は、このように鋳造圧力上限
Ｐmax が凝固層の生成に応じて大きくなることを利用し
て、鋳造の途中で鋳造圧力を上げるようにしたものであ
り、、鋳造の過程で鋳造圧力を高くさせることによっ
て、厚肉の製品においても内部品質、機械的性質の良好
なものを得ることが可能である。According to the present invention, after the metal mold is filled into the mold cavity by the injection mechanism and the casting is started and the casting pressure reaches the initial set casting pressure P O , the molten metal in the mold cavity is filled. According to the formation of the solidified layer, the casting pressure is increased to perform casting. Initial setting casting pressure P in this case
As described above, O is a constant pressure equal to or lower than the casting pressure upper limit Pmax determined by the apparatus conditions including the mold clamping force of the casting machine and the pressure area of the molten metal in the mold opening direction.
As the casting progresses, the molten metal in the mold cavity forms a solidified layer in the outer part in contact with the mold. The molten metal receiving pressure area in the mold with respect to the direction decreases, and therefore, the casting pressure upper limit Pmax increases with the formation of a solidified layer. The present invention utilizes the fact that the casting pressure upper limit Pmax increases in accordance with the formation of a solidified layer, thereby increasing the casting pressure in the course of casting. By increasing the height, it is possible to obtain a product having good internal quality and mechanical properties even in a thick product.
【０００７】[0007]
【実施例】以下、本発明の実施例について添付図面を参
照しながら説明する。図１は、本発明方法の実施例に係
る高圧鋳造機の概略示構造図である。金型は固定側のベ
ースに取付けられる固定型１と、可動側のベースに取付
けられて前記固定型１に上方から合わせる可動型２とか
ら成っていて、両型１，２内に形成される金型キャビテ
ィ３に、固定側ベースに設けられたスリーブ４から金属
溶湯５を注湯した後、プランジャチップ６を押し込んで
加圧射出することにより、金属溶湯５を金型キャビティ
３内に充填する。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic structural view showing a high-pressure casting machine according to an embodiment of the present invention. The mold comprises a fixed mold 1 attached to a fixed base, and a movable mold 2 attached to the movable base to match the fixed mold 1 from above. After the molten metal 5 is poured into the mold cavity 3 from the sleeve 4 provided on the fixed side base, the plunger tip 6 is pushed in and injected under pressure to fill the molten metal 5 into the mold cavity 3. .
【０００８】射出完了後、プランジャチップ６によって
金型キャビティ３内の金属溶湯５に初期設定鋳造圧力Ｐ
O をかけてその状態を保持する。この場合の鋳造圧力Ｐ
O は、下記の式（イ）によって求められる鋳造圧力上限
Ｐmax 未満の適当な値（ＰO＜Ｐmax ）である。After the injection is completed, an initial casting pressure P is applied to the molten metal 5 in the mold cavity 3 by the plunger tip 6.
O is applied to maintain the state. Casting pressure P in this case
O is an appropriate value (P O <Pmax) below the upper limit Pmax of the casting pressure obtained by the following equation (A).
【０００９】 Ｐmax ＝Ｆ／Ｓ …………（イ） 但し、 Ｐmax ；鋳造圧力上限、 Ｆ ；型締め力、 Ｓ ；型開き方向の溶湯受圧面積 なお、鋳造開始時における鋳造圧力上限Ｐmax を求める
場合の上記溶湯受圧面積Ｓは、金型の設計条件に基づく
金型キャビティ３の型開き方向投影面積であり、従っ
て、この場合のＰmax は、装置条件によって決まる値で
ある。Pmax = F / S (a) where Pmax: upper limit of casting pressure, F: mold clamping force, S: area of receiving pressure of molten metal in mold opening direction. Upper limit of casting pressure Pmax at the start of casting is obtained. The molten metal pressure receiving area S in this case is the projected area of the mold cavity 3 in the mold opening direction based on the design conditions of the mold. Therefore, Pmax in this case is a value determined by the equipment conditions.
【００１０】鋳造が進行するに伴って、金型キャビティ
３内に充填された金属溶湯５は、図２に示すように、金
型１，２に接する外側の部分から凝固が進んで（図２に
左下がり斜線部分で示される）、金型キャビティ３外側
より凝固層７が生成される。凝固層７が金型キャビティ
３内にある程度の厚みを生成した時点で、鋳造圧力を上
げる。つまり、この時点では、金型キャビティ３内に残
存する金属溶湯５は、凝固層７を除いた相当量に減じて
おり、それに伴って型開き方向の溶湯受圧面積Ｓが小さ
く成っている。従って、式（イ）から判るように、この
ときの鋳造圧力上限Ｐmax は、凝固層の生成に対応して
鋳造開始時の値よりも大きくなり、本発明は、このよう
にＰmax が凝固層の生成とともに上がることを利用し
て、鋳造の途中で鋳造圧力を上げるようにしている。勿
論、このときの鋳造圧力は、その時点でのＰmax 値を超
えない範囲で前記初期設定鋳造圧力ＰO よりも高い値で
ある。As the casting progresses, as shown in FIG. 2, the molten metal 5 filled in the mold cavity 3 solidifies from the outer portion in contact with the molds 1 and 2 (FIG. 2). The solidified layer 7 is generated from the outside of the mold cavity 3. When the solidified layer 7 has formed a certain thickness in the mold cavity 3, the casting pressure is increased. That is, at this time, the amount of the molten metal 5 remaining in the mold cavity 3 has been reduced to a considerable amount excluding the solidified layer 7, and accordingly, the molten metal pressure receiving area S in the mold opening direction has been reduced. Therefore, as can be seen from the equation (a), the casting pressure upper limit Pmax at this time becomes larger than the value at the start of casting in accordance with the formation of the solidified layer. Utilizing the fact that it rises with production, the casting pressure is raised during casting. Needless to say, the casting pressure at this time is a value higher than the initial casting pressure P O within a range not exceeding the Pmax value at that time.
【００１１】ところで、鋳造圧力Ｐ及び鋳造圧力を上げ
るタイミングの決定方法としては、金属溶湯５について
の凝固解析を行い、ある程度の厚みの凝固層７が生成さ
れる時間並びにこのときの残存する溶湯の型締め方向の
投影面積に基づいて決められる。この点に関して、さら
に詳細に解析することによって、金型キャビティ内の凝
固の進捗状況に見合った鋳造圧力パターンを得ることが
可能であり、鋳造圧力の上げ方に関しては、段階的また
は無段階的に上げて行くことが可能である。As a method of determining the casting pressure P and the timing of increasing the casting pressure, a solidification analysis of the molten metal 5 is performed to determine the time required for forming the solidified layer 7 having a certain thickness and the remaining molten metal at this time. It is determined based on the projected area in the mold clamping direction. In this regard, by performing a more detailed analysis, it is possible to obtain a casting pressure pattern commensurate with the progress of solidification in the mold cavity, and to increase the casting pressure stepwise or steplessly. It is possible to go up.
【００１２】本発明方法の各実施例に係る鋳造圧力及び
射出速度の推移を線図で示したものが図３である。同図
において、線Ａは鋳造圧力を所定時間経過後に段階的に
上げる例であり、線Ｂは凝固層の生成速度に対応して無
段階的に鋳造圧力を上げる例である。FIG. 3 is a diagram showing transitions of casting pressure and injection speed according to each embodiment of the method of the present invention. In the figure, a line A is an example in which the casting pressure is increased stepwise after a predetermined time has elapsed, and a line B is an example in which the casting pressure is increased steplessly in accordance with the generation speed of the solidified layer.
【００１３】「実験例」26×36mmの方形断面形状をした
アームを４方向に持つ製品について、アルミニウム合金
ＡＣ４Ｃを用いて凝固解析を実施し、本発明方法の２段
階加圧を用いた鋳造法及び従来の１段加圧法の両者を肉
厚の同一製品に適用し、その機械的性質を比較した。そ
の結果は下記〔表１〕に示される通りである。"Experimental example" A solidification analysis was performed on a product having arms having a square cross section of 26 x 36 mm in four directions using an aluminum alloy AC4C, and the casting method using two-stage pressurization of the method of the present invention. And the conventional one-stage pressing method were applied to the same product having the same thickness, and the mechanical properties were compared. The results are as shown in [Table 1] below.
【００１４】[0014]
【表１】 [Table 1]
【００１５】〔表１〕から明らかなように、本発明方法
により得られた製品は、従来の比較製品に対して、引張
強さ，耐力共に優れるとともに、鋳造欠陥が無くて、品
質が高いことが立証される。As is clear from Table 1, the product obtained by the method of the present invention is excellent in both tensile strength and proof stress, has no casting defects and is of high quality as compared with the conventional comparative product. Is proved.
【００１６】[0016]
【発明の効果】以上述べたように本発明によれば、金型
キャビティ形状に対して必要最小限度の大きさに作製さ
れた金型によって、鋳造の途中で鋳造圧力を上げる高圧
鋳造が可能であって、装置のコンパクト化を図るととも
に、殊に厚肉の製品について内部品質及び機械的性質が
良好なものを低コストで提供することができる。As described above, according to the present invention, it is possible to perform high-pressure casting in which the casting pressure is increased during casting by using a mold manufactured to the minimum necessary size for the mold cavity shape. In addition, it is possible to reduce the size of the device and to provide a product having good internal quality and mechanical properties, especially for a thick product, at a low cost.
【図１】本発明方法の実施例に係る高圧鋳造機の概略示
構造図である。FIG. 1 is a schematic structural view of a high-pressure casting machine according to an embodiment of the present invention.
【図２】図１に示す高圧鋳造機の射出終了直後の金型内
溶湯状態説明図である。FIG. 2 is an explanatory view of a state of molten metal in a mold immediately after the end of injection of the high-pressure casting machine shown in FIG.
【図３】本発明の各実施例における鋳造圧力態様及び射
出速度態様の経時線図である。FIG. 3 is a time-dependent diagram of a casting pressure mode and an injection speed mode in each embodiment of the present invention.
【図４】従来の鋳造方法における鋳造圧力態様及び射出
速度態様の経時線図である。FIG. 4 is a time-dependent diagram of a casting pressure mode and an injection speed mode in a conventional casting method.
１…固定型 ２…可動型 ３…金型キャビティ ４…スリーブ ５…金属溶湯 ６…プランジャ
チップ ７…凝固層 Ｐmax …鋳造圧力上
限 ＰO …初期設定鋳造圧力 DESCRIPTION OF SYMBOLS 1 ... Fixed mold 2 ... Movable mold 3 ... Die cavity 4 ... Sleeve 5 ... Molten metal 6 ... Plunger chip 7 ... Solidified layer Pmax ... On casting pressure
Limited P O ... initialization casting pressure
フロントページの続き (56)参考文献 特開 平３−230858（ＪＰ，Ａ) 特開 平３−18466（ＪＰ，Ａ) 特開 平６−292961（ＪＰ，Ａ) 特開 平７−155927（ＪＰ，Ａ) 特開 平３−18465（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B22D 18/02 B22D 17/32Continuation of the front page (56) References JP-A-3-230858 (JP, A) JP-A-3-18466 (JP, A) JP-A-6-292961 (JP, A) JP-A-7-155927 (JP) , A) JP-A-3-18465 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B22D 18/02 B22D 17/32
Claims (1)
ティ内に充填した後、前記金属溶湯に鋳造圧力を加えて
鋳造を行う高圧鋳造方法において、鋳造を開始し、鋳造
圧力が初期設定鋳造圧力ＰO に達した後、前記金型キャ
ビティ内の金属溶湯の凝固層の生成に応じて、該生成と
ともに上昇する鋳造圧力上限Ｐmax を超えない範囲で、
前記鋳造圧力を段階的または無段階的に上げて鋳造を行
うことを特徴とする高圧鋳造方法。In a high-pressure casting method in which a molten metal is filled into a mold cavity by an injection mechanism and then a casting pressure is applied to the molten metal to perform casting, the casting is started and the casting pressure is set to an initially set casting pressure P. after reaching O, and depending on the generation of the solidified layer of molten metal within the mold cavity, and the product
As long as the casting pressure does not exceed the upper limit Pmax,
A high-pressure casting method, wherein the casting pressure is increased stepwise or steplessly to perform casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21571393A JP2849312B2 (en) | 1993-08-31 | 1993-08-31 | High pressure casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21571393A JP2849312B2 (en) | 1993-08-31 | 1993-08-31 | High pressure casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0760427A JPH0760427A (en) | 1995-03-07 |
| JP2849312B2 true JP2849312B2 (en) | 1999-01-20 |
Family
ID=16676942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21571393A Expired - Fee Related JP2849312B2 (en) | 1993-08-31 | 1993-08-31 | High pressure casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2849312B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102651330B1 (en) * | 2021-08-27 | 2024-03-26 | (주)서영 | Mold device for multi-stage press casting process |
-
1993
- 1993-08-31 JP JP21571393A patent/JP2849312B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0760427A (en) | 1995-03-07 |
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