JPH01186259A - Method and device for casting - Google Patents
Method and device for castingInfo
- Publication number
- JPH01186259A JPH01186259A JP993188A JP993188A JPH01186259A JP H01186259 A JPH01186259 A JP H01186259A JP 993188 A JP993188 A JP 993188A JP 993188 A JP993188 A JP 993188A JP H01186259 A JPH01186259 A JP H01186259A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- mold
- furnace
- pressure vessel
- holding
- 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.)
- Pending
Links
- 238000005266 casting Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 229910001234 light alloy Inorganic materials 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は気密性を有する圧力容器内に、溶湯の入った炉
および型を設置し、炉側と型側の両方の圧力容器内に充
填した気体の圧力を大気圧以上のほぼ同じ圧力に昇圧、
保持した後に、炉側圧力容器と型側圧力容器との間に圧
力差を生じさせて、炉と型とを連通ずるストークを介し
て、炉内の溶湯を型内に鋳込む鋳造方法に関するもので
ある。Detailed Description of the Invention (Industrial Application Field) The present invention involves installing a furnace and a mold containing molten metal in an airtight pressure vessel, and filling the pressure vessels on both the furnace side and the mold side. The pressure of the gas is increased to approximately the same pressure above atmospheric pressure,
A casting method in which the molten metal in the furnace is poured into the mold through a stalk that communicates the furnace and mold by creating a pressure difference between the furnace-side pressure vessel and the mold-side pressure vessel after holding the metal. It is.
（従来の技術）
気密性を有する圧力容器内に型と炉を設置して、圧力容
器内の圧力を大気圧以上に昇圧して鋳造する方法は、１
９６０年頃にブルガニアで発明され、Ｃｏｕｎｔｅｒ
Ｄｒｅｓｓｕｒｅ Ｃａｓｔｉｎｇ （逆圧鋳造法また
は差圧鋳造法、以下差圧鋳造という。）として広く知ら
れており、国内においては、特願昭５１−１２９２９６
号では中間るつぼを設けた鋳造装置、特願昭４９−９４
１２８号では鋳型に注湯する速度を制御する装置、特願
昭５６−１９９９３０号では、不活性ガスを用いた装置
、特願昭５８−１２７５１１号では型内に溶湯を充填し
た後に、型内に作用している圧力よりも高い圧力を、プ
ランジャにより付加する鋳造方法が開示されており、外
国においてもフランス特許公報隘３１９６５０１／１９
６３．米国特許公報隘３１９６５０１ ／ １９６５゜
ブルガニア特許公報患１８７／１９６Ｌ 患９８９３５
３／１９６５等にその基本的原理が開示されている。ま
た昭和５０年には、東京に於いて、プルガニア人民共和
国逆圧鋳造技術講演会が開催され、その鋳造方法の基本
原理と鋳造品の品質については、周知の技術となってい
る。(Prior art) A method of casting by installing a mold and a furnace in an airtight pressure vessel and increasing the pressure inside the pressure vessel to above atmospheric pressure is 1.
Invented in Bulgaria around 960, the Counter
It is widely known as Dressure Casting (reverse pressure casting method or differential pressure casting method, hereinafter referred to as differential pressure casting), and in Japan, it has been patented in Japanese Patent Application No. 129296-1983.
The issue is a casting device equipped with an intermediate crucible, patent application 1983-1994.
No. 128 discloses a device that controls the speed of pouring molten metal into a mold, Japanese Patent Application No. 199930 shows a device that uses an inert gas, and Japanese Patent Application No. 127511 shows a device that controls the speed of pouring molten metal into a mold. A casting method is disclosed in which a plunger applies a pressure higher than the pressure acting on the
63. U.S. Patent Publication No. 3196501 / 1965゜Bulgarian Patent Publication No. 187/196L No. 98935
The basic principle is disclosed in 3/1965 etc. In 1975, a seminar on reverse pressure casting technology of the People's Republic of Purgania was held in Tokyo, and the basic principles of the casting method and the quality of the cast products have become well known.
（問題点）
差圧鋳造の基本原理は開示されているが、差圧鋳造によ
る鋳造品の品質の決め手となる加圧力と、差圧に関して
は、最適条件が明確に把握されてなく、広く普及する障
害となっている。(Problems) Although the basic principle of differential pressure casting has been disclosed, the optimal conditions for the pressure and differential pressure, which are the deciding factors for the quality of cast products made by differential pressure casting, are not clearly understood, and it is not widely used. It has become an obstacle to
（問題点を解決する為の手段）
本発明は上記のように、差圧鋳造で把握されていない加
圧力と差圧の最適条件を確立し、高品質の鋳造品を生産
する差圧鋳造方法、差圧鋳造装置、差圧鋳造品に関する
ものである。すなわち、気密性を有する圧力容器内に、
溶湯の入った炉と型とを設置し、炉側と型側の両方の圧
力容器内に充填した気体の圧力を大気圧以上のほぼ同じ
圧力に昇圧保持した後に、炉側圧力容器と型側圧力容器
との間に圧力差を生じさせて、炉と型とを連通ずるスト
ークを介して炉内の溶湯を型内に鋳込む際に、炉側圧力
容器内と型側圧力容器内との圧力差を昇圧、保持圧力の
０．５〜３０％にすることにより、最適鋳造条件を確立
したものである。加圧力と差圧の関係においては加圧力
３〜７ｋｇｆ／ａＪでは差圧３〜３０％、加圧カフ〜３
０ｋｇｆ／−においては、差圧０．５〜１０％が望まし
い。例えば加圧力５１ｇｆ／ｄ〜の差圧鋳造においては
、鋳造速度を決める差圧は加圧力の４〜１５％、圧力と
しては０．２〜０、７５ ｋｇｆ／ａｄ、加圧力１５ｋ
ｇｆ／ＣＩＡでは２〜８％、圧力としては０．３〜１．
２ｋｇ／ａＪが適当であり、加圧力と差圧は鋳造に使用
する材質と形状に応じて適宜選択するものである。また
鋳造装置の基本仕様においては、炉と型および、その炉
と型とを連通するストーク、前記炉と型とを設置する気
密性を存する圧力容器と炉側圧力容器と型側圧力容器に
気体を充填して、その圧力を大気圧以上のほぼ同じ圧力
最大３０ｋｇｆ／ｃｍ２に昇圧、保持した後に、炉側圧
力容器と型側圧力容器との間に、保持圧力の０．５〜３
０％の圧力差を生じさせる手段を有していることを特徴
とするものである。更に上記鋳造装置を用い、上記鋳造
方法による軽合金、特にアルミニウム合金、マグネシウ
ム合金を用いた機械的性質が良好で、内部欠陥の少い高
品質の鋳造品を提供するものである。(Means for Solving the Problems) As described above, the present invention is a differential pressure casting method that establishes optimal conditions for pressurizing force and differential pressure that are not known in differential pressure casting, and produces high-quality cast products. , differential pressure casting equipment, and differential pressure casting products. In other words, inside a pressure vessel with airtightness,
After installing a furnace containing molten metal and a mold, and increasing and maintaining the pressure of the gas filled in both pressure vessels on the furnace side and mold side to approximately the same pressure above atmospheric pressure, the pressure vessels on the furnace side and the mold side are When pouring the molten metal in the furnace into the mold via the stalk that communicates the furnace and mold by creating a pressure difference between the furnace side pressure vessel and the mold side pressure vessel, Optimal casting conditions were established by increasing the pressure difference and increasing the pressure to 0.5 to 30% of the holding pressure. Regarding the relationship between pressurization force and differential pressure, when pressurization force is 3 to 7 kgf/aJ, differential pressure is 3 to 30%, pressurization cuff to 3
At 0 kgf/-, a differential pressure of 0.5 to 10% is desirable. For example, in differential pressure casting with a pressure of 51gf/d~, the differential pressure that determines the casting speed is 4 to 15% of the pressure, the pressure is 0.2 to 0.75 kgf/ad, and the pressure is 15k.
gf/CIA is 2-8%, pressure is 0.3-1.
2 kg/aJ is appropriate, and the pressurizing force and differential pressure are appropriately selected depending on the material and shape used for casting. In addition, the basic specifications of the casting equipment include a furnace and a mold, a stalk that communicates the furnace and the mold, an airtight pressure vessel in which the furnace and the mold are installed, and a gas in the furnace-side pressure vessel and mold-side pressure vessel. After charging and increasing the pressure to almost the same pressure of 30 kgf/cm2 at maximum, which is above atmospheric pressure, a pressure of 0.5 to 3 of the holding pressure is placed between the furnace side pressure vessel and the mold side pressure vessel.
It is characterized by having means for generating a pressure difference of 0%. Furthermore, it is an object of the present invention to provide a high-quality cast product with good mechanical properties and few internal defects using a light alloy, particularly an aluminum alloy or a magnesium alloy, made by the above-described casting method using the above-mentioned casting apparatus.
（実施例）
第１図は本発明の鋳造機、第２図は差圧制御の時間と圧
力の関係を示す図、第３図は第２図の圧力を発生する制
御回路構成を示す図である。第１図において金型２．３
を圧力容器４に、保持炉６を圧力容器７に設置し、油圧
シリンダー９により可動プラテン１０を下降させて、圧
力容器４を閉じる。次に油圧シリンダー８を下降させて
、金型の上型、下型をつき合せる。次に気体の給入管１
１．１２より高圧の気体を充填させて、第２図に示すよ
うに、圧力容器４．７の圧力を昇上して、８ｋｇｆ／ｃ
ｆｆｌまで上昇させる。本実施例では１７の加圧時間は
２５秒要している。次に金型側圧力容器内の圧力を７ｋ
ｇｆ／−迄減圧する。この工程は１８の鋳造工程であり
、圧力容器４と圧力容器７との圧力差１ｋｇｆ／ｃｄに
より約２５秒の間に保持炉６内の溶湯はストーク５を介
して金型の製品部９に吸引される。次に金型内に溶湯が
充填すると、加圧効果を出す為に約３分差圧を保持する
。これが１９の加圧工程である。次に保持炉６内の圧力
も減圧して圧力容器４と７の圧力を同じくすると、スト
ーク５内の溶湯は落下して保持炉６に戻り、金型製品部
１と湯道部分が金型に残る。排気口１３．１４を開き圧
力容器内の圧力を大気圧近くにする２０の工程を終え、
油圧シリンダー９を上昇させて上型３を下型２より切り
はなし、更に油圧シリンダー８を上昇させて、製品部１
を上型３より離型させて１サイクルが完了する。第３図
は圧力制御回路を示すものであり、圧力容器３１゜３２
の圧力を圧力検出機３５により検出し、サーボバルブ３
６とリレバルブ３７を介して圧力の設定値と現状値を比
較しながら、設定値に近づけるようにフィードバック制
御を行っている。第２に示すような圧力制御はコンピュ
ーター３３により制御を行っており、気体の供給排気は
電磁弁３９゜４０を開閉して行っている。尚、上記に記
載しである鋳造機の構成、圧力制御の仕方、圧力の制御
回路は実施例の１部であり、本発明にこれに限定される
ものではなく、あくまでも特許請求の範囲に示す、技術
分野を網らするものであることはいうまでもない。(Example) Fig. 1 is a casting machine of the present invention, Fig. 2 is a diagram showing the relationship between time and pressure in differential pressure control, and Fig. 3 is a diagram showing the control circuit configuration for generating the pressure in Fig. 2. be. In Figure 1, mold 2.3
is placed in the pressure vessel 4 and the holding furnace 6 is placed in the pressure vessel 7, and the movable platen 10 is lowered by the hydraulic cylinder 9 to close the pressure vessel 4. Next, the hydraulic cylinder 8 is lowered and the upper and lower molds of the mold are brought into contact. Next, gas supply pipe 1
Fill the pressure vessel 4.7 with higher pressure gas than 1.12 and increase the pressure in the pressure vessel 4.7 to 8 kgf/c as shown in Figure 2.
Increase to ffl. In this example, the pressurization time of 17 requires 25 seconds. Next, increase the pressure in the mold side pressure vessel to 7k.
Reduce pressure to gf/-. This process is the 18th casting process, and due to the pressure difference of 1 kgf/cd between the pressure vessels 4 and 7, the molten metal in the holding furnace 6 passes through the stalk 5 to the product part 9 of the mold in about 25 seconds. be attracted. Next, when the mold is filled with molten metal, the differential pressure is maintained for about 3 minutes to create a pressurizing effect. This is the 19th pressurizing process. Next, when the pressure inside the holding furnace 6 is also reduced to make the pressures in the pressure vessels 4 and 7 the same, the molten metal inside the stalk 5 falls and returns to the holding furnace 6, and the mold product part 1 and the runner part are removed from the mold. remains in After completing 20 steps of opening the exhaust ports 13 and 14 and bringing the pressure inside the pressure vessel close to atmospheric pressure,
The hydraulic cylinder 9 is raised to separate the upper mold 3 from the lower mold 2, and the hydraulic cylinder 8 is further raised to separate the product part 1.
is released from the upper mold 3 to complete one cycle. Figure 3 shows the pressure control circuit, with pressure vessels 31°32
The pressure of the servo valve 3 is detected by the pressure detector 35.
6 and the relay valve 37, the set value of the pressure is compared with the current value, and feedback control is performed so as to approach the set value. Pressure control as shown in the second figure is controlled by a computer 33, and gas supply and exhaust is performed by opening and closing electromagnetic valves 39 and 40. It should be noted that the configuration of the casting machine, the method of pressure control, and the pressure control circuit described above are part of the embodiments, and the present invention is not limited thereto, and is merely shown in the claims. , it goes without saying that it covers a wide range of technical fields.
（発明の効果）
差圧鋳造の特徴である、加圧力量大３０ｋｇｆ／ｃｍ２
において適切なる差圧力を備えた鋳造機を用いた鋳造方
法により、次のような効果により軽合金、特にアルミニ
ウム合金とマグネシウム合金の特徴ある鋳造品が可能と
なった。(Effect of the invention) Large pressurizing force of 30 kgf/cm2, which is a feature of differential pressure casting.
By using a casting method using a casting machine equipped with an appropriate differential pressure, it has become possible to produce distinctive cast products of light alloys, especially aluminum alloys and magnesium alloys, due to the following effects.
（１１高加圧力下での鋳造により、内部欠陥が少く、組
織の微細な鋳造品が得られた。(11) By casting under high pressure, a cast product with few internal defects and a fine structure was obtained.
（２）高加圧力下での適切な差圧発生による鋳造により
、鋳造性が向上し、複雑形状品や難鋳造材の鋳造が可能
となった。(2) Casting by generating an appropriate differential pressure under high pressure improves castability, making it possible to cast products with complex shapes and materials that are difficult to cast.
第１図は本実施例で用いた鋳造機、第２図は鋳造時の圧
力制御、第３図圧力制御回路を示す図である。
１・・・金型製品部、２・・・下型、３・・・上型、４
・・・圧力容器、５・・・ストーク、６・・・保持炉、
７・・・圧力容器、８・・・油圧シリンダー、９・・・
油圧シリンダー、１０・・・可動プラテン、１１．１２
・・・給供口、１３゜１４・・・排気口、１５・・・金
型側圧力線図、１６・・・保持炉圧力線図、１７・・・
加圧工程、１８・・・鋳造工程、１９・・・凝固工程、
２０・・・冷却・排気工程、３１゜３２・・・圧力容器
、３３・・・コンピューター、３４・・・増巾器、３５
・・・圧力検出器、３６・・・サーボパルプ、３７・・
・リレーバルブ、３９．４０・・・電磁切換弁、４１・
・・コンプレッサー。FIG. 1 shows the casting machine used in this example, FIG. 2 shows the pressure control during casting, and FIG. 3 shows the pressure control circuit. 1... Mold product department, 2... Lower mold, 3... Upper mold, 4
...pressure vessel, 5...stoke, 6...holding furnace,
7...Pressure vessel, 8...Hydraulic cylinder, 9...
Hydraulic cylinder, 10... Movable platen, 11.12
...Supply port, 13°14...Exhaust port, 15...Mold side pressure diagram, 16...Holding furnace pressure diagram, 17...
Pressure process, 18... Casting process, 19... Solidification process,
20... Cooling/exhaust process, 31° 32... Pressure vessel, 33... Computer, 34... Amplifier, 35
...Pressure detector, 36...Servo pulp, 37...
・Relay valve, 39.40... Solenoid switching valve, 41.
··compressor.
Claims (1)
は溶解炉（以下炉という）および、鋳型または金型（以
下型という）を設置し、炉側と型側の両方の圧力容器内
に充填した気体の圧力を、大気圧以上のほぼ同じ圧力に
昇圧保持した後に、炉側圧力容器と型側圧力容器との間
に圧力差を生じさせて、炉と型とを連通するストークを
介して、炉内の溶湯を型内に鋳込む鋳造方法において、
（１）炉側圧力容器内と型側圧力容器内との圧力差を昇
圧、保持圧力の０．５〜３０％にすることを特徴とする
鋳造方法。 （２）圧力容器内の圧力を３〜７ｋｇｆ／ｃｍ＾２に昇
圧、保持した後に、炉側圧力容器内と型側圧力容器内と
の圧力差を保持圧力の３〜３０％にすることを特徴とす
る鋳造方法。 （３）圧力容器内の圧力を７ｋｇｆ／ｃｍ＾２〜３０ｋ
ｇｆ／ｃｍ＾２に昇圧、保持した後に、炉側圧力容器内
と型側圧力容器内との圧力差を保持圧力の０．５〜１０
％にすることを特徴とする鋳造方法。 （４）炉と型および、その炉と型とを連通するストーク
と、前記炉と型とを設置する気密性を有する圧力容器と
、炉側圧力容器と型側圧力容器に気体を充填して、その
圧力を大気圧以上最大３０ｋｇｆ／ｃｍ＾２のほぼ同じ
圧力に昇圧、保持した後に、炉側圧力容器と型側圧力容
器との間に、保持圧力の０．５〜３０％の圧力差を生じ
させる手段を有していることを特徴とする鋳造装置。 （５）特許請求の範囲第４項記載の鋳造装置を用い、特
許請求の範囲第１項乃至第３項記載の鋳造方法により鋳
造したことを特徴とする軽合金鋳造品。 （６）特許請求の範囲第５項において、軽合金鋳造品は
アルミニウム合金よりなることを特徴とする鋳造品。 （７）特許請求の範囲第５項において、軽合金鋳造品は
マグネシウム合金よりなることを特徴とする鋳造品。[Claims] A holding furnace or melting furnace containing molten metal (hereinafter referred to as a furnace) and a mold or metal mold (hereinafter referred to as a mold) are installed in an airtight pressure vessel, and the furnace side and mold side are After increasing and maintaining the pressure of the gas filled in both pressure vessels at almost the same pressure above atmospheric pressure, a pressure difference is created between the furnace-side pressure vessel and the mold-side pressure vessel, and the furnace and mold are separated. In a casting method in which molten metal in a furnace is cast into a mold through a stalk that communicates with
(1) A casting method characterized by increasing the pressure difference between the inside of the furnace side pressure vessel and the inside of the mold side pressure vessel to 0.5 to 30% of the holding pressure. (2) After increasing and maintaining the pressure in the pressure vessel to 3 to 7 kgf/cm^2, the pressure difference between the furnace side pressure vessel and the mold side pressure vessel should be 3 to 30% of the holding pressure. Characteristic casting method. (3) Reduce the pressure inside the pressure vessel to 7kgf/cm^2~30k
After raising the pressure to gf/cm^2 and holding it, the pressure difference between the inside of the furnace side pressure vessel and the inside of the mold side pressure vessel is 0.5 to 10 of the holding pressure.
% casting method. (4) A furnace and a mold, a stalk communicating the furnace and mold, an airtight pressure vessel in which the furnace and mold are installed, and a furnace-side pressure vessel and a mold-side pressure vessel filled with gas. , After increasing and maintaining the same pressure above atmospheric pressure at a maximum of 30 kgf/cm^2, a pressure difference of 0.5 to 30% of the holding pressure is created between the furnace side pressure vessel and the mold side pressure vessel. A casting device characterized in that it has means for producing. (5) A light alloy cast product, characterized in that it is cast using the casting apparatus set forth in claim 4 and by the casting method set forth in claims 1 to 3. (6) The cast product according to claim 5, wherein the light alloy cast product is made of an aluminum alloy. (7) The cast product according to claim 5, wherein the light alloy cast product is made of a magnesium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP993188A JPH01186259A (en) | 1988-01-20 | 1988-01-20 | Method and device for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP993188A JPH01186259A (en) | 1988-01-20 | 1988-01-20 | Method and device for casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01186259A true JPH01186259A (en) | 1989-07-25 |
Family
ID=11733806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP993188A Pending JPH01186259A (en) | 1988-01-20 | 1988-01-20 | Method and device for casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01186259A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372181A (en) * | 1992-03-26 | 1994-12-13 | Hitachi Metals, Ltd. | Counter pressure casting and counter pressure casting device |
-
1988
- 1988-01-20 JP JP993188A patent/JPH01186259A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372181A (en) * | 1992-03-26 | 1994-12-13 | Hitachi Metals, Ltd. | Counter pressure casting and counter pressure casting device |
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