JPH0371964A - Apparatus and method for low pressure casting - Google Patents
Apparatus and method for low pressure castingInfo
- Publication number
- JPH0371964A JPH0371964A JP20872989A JP20872989A JPH0371964A JP H0371964 A JPH0371964 A JP H0371964A JP 20872989 A JP20872989 A JP 20872989A JP 20872989 A JP20872989 A JP 20872989A JP H0371964 A JPH0371964 A JP H0371964A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- stalk
- space
- inert gas
- cavity
- 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 24
- 238000000034 method Methods 0.000 title claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 239000011261 inert gas Substances 0.000 claims abstract description 17
- 238000009825 accumulation Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はるつぼ等の密閉容器内に貯溜した溶湯を加圧す
ることでキャビティ内に充填せしめるようにした低圧鋳
造装置及び低圧鋳造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a low-pressure casting apparatus and a low-pressure casting method in which molten metal stored in a closed container such as a crucible is pressurized to fill a cavity.
（従来の技術）
アルミニウム合金等の溶湯を低圧鋳造する装置として特
公昭４０−１６６５７号及び特公昭５４−２９４４８号
に開示されるものが知られている。(Prior Art) As an apparatus for low-pressure casting of molten metal such as aluminum alloy, there are known apparatuses disclosed in Japanese Patent Publication No. 16657-1982 and Japanese Patent Publication No. 29448-1982.
特公昭４０−１６６５７号に開示される装置は、ストー
クの上端内方に下方への層管を垂下し、この唇管とスト
ークとの間に空環を形成し、この空環によって保温作用
を発揮せしめるようにしたものであり、特公昭５４−２
９４４８号に開示される装置は密閉容器内の圧力を溶湯
の減少に応じて段階的に高め、ストーク内の溶湯表面を
常に湯口より僅かに下になるようにしたものである。The device disclosed in Japanese Patent Publication No. 40-16657 has a layer tube hanging downward inside the upper end of the stalk, and an empty ring is formed between this lip tube and the stalk, and this empty ring provides a heat retention effect. It was designed to make the most of the
The device disclosed in No. 9448 increases the pressure inside the closed container in stages as the molten metal decreases, so that the surface of the molten metal in the stalk is always slightly below the sprue.
（発明が解決しようとする課題〉
上述したいずれの鋳造装置も離型の際に外気がストーク
内の溶湯表面に接触する。その結果、酸化物を形成し、
この酸化物が次の鋳造時にキャビティ内に巻き込まれる
。(Problems to be Solved by the Invention) In any of the above-mentioned casting apparatuses, outside air comes into contact with the surface of the molten metal in the stalk during mold release.As a result, oxides are formed,
This oxide is drawn into the cavity during the next casting.
（課題を解決するための手段）
上記課題を解決すべく本発明は、密閉容器内に貯溜した
溶湯を鋳型のキャビティ内に供給するストークの上端に
中間ストーク又は湯口板を取付け、この中間ストーク又
は湯口板の下面に下方へ垂下する環状突出部を設けて、
この突出部の外側に空間部を画威し、この空間部を不活
性ガスの蓄圧タンクに接続した。(Means for Solving the Problems) In order to solve the above problems, the present invention provides an intermediate stalk or sprue plate that is attached to the upper end of a stalk that supplies molten metal stored in a closed container into a mold cavity. An annular protrusion that hangs downward is provided on the lower surface of the sprue plate,
A space was defined on the outside of this protrusion, and this space was connected to an inert gas pressure accumulation tank.
（作用）
鋳造時には環状突出部よりも溶湯表面を上方に位置せし
めることで、キャビティ内への不活性ガスの流入はなく
、離型時には空間部に不活性ガスが供給されるため中間
ストーク内は負圧とならず、溶湯表面の外気との接触を
防ぐ。(Function) By positioning the molten metal surface above the annular protrusion during casting, inert gas does not flow into the cavity, and when demolding, inert gas is supplied to the space, so the inside of the intermediate stalk is This prevents negative pressure from coming into contact with the outside air on the surface of the molten metal.
（実施例） 以下に本発明の実施例を添付図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the accompanying drawings.
第１図は本発明に係る低圧鋳造装置の全体断面図、第２
図は同低圧鋳造装置の要部拡大断面図である。Fig. 1 is an overall cross-sectional view of a low-pressure casting apparatus according to the present invention, Fig.
The figure is an enlarged cross-sectional view of essential parts of the same low-pressure casting apparatus.
低圧鋳造装置は溶浸材を貯溜する密閉容器１内に上方か
らストーク２を挿入するとともに加圧用ガスの供給バイ
ブ３を接続している。In the low-pressure casting apparatus, a stalk 2 is inserted from above into a closed container 1 for storing an infiltrant, and a pressurizing gas supply vibe 3 is connected thereto.
また、密閉容器１上方には支持板４を設け、この支持板
４上に上型５ａと下型５ｂからなる鋳型５を設置し、上
型５ａについてはシリンダユニット等により下型５ｂに
対し昇降動するようにし、上型５ａと下型５ｂを合せた
状態でキャビティ６が形成され、このキャビティ６内に
溶湯Ｍを導くランナ８を下型５ｂに形成している。Further, a support plate 4 is provided above the closed container 1, and a mold 5 consisting of an upper mold 5a and a lower mold 5b is installed on the support plate 4, and the upper mold 5a is raised and lowered relative to the lower mold 5b by a cylinder unit or the like. A cavity 6 is formed by combining the upper mold 5a and the lower mold 5b, and a runner 8 for guiding the molten metal M into the cavity 6 is formed in the lower mold 5b.
一方、前記ストーク２の上端には中間ストーク９を取付
け、この中間ストーク９の下面に下方への環状突出部１
０を設け、この環状突出部１０に更に下方へ延びるスカ
ート部１１を取付け、環状突出部１０の外側面をストー
ク２内側面との間に環状の空間部Ｓ１を画成している。On the other hand, an intermediate stalk 9 is attached to the upper end of the stalk 2, and a downward annular protrusion 1 is attached to the lower surface of the intermediate stalk 9.
0, and a skirt portion 11 extending further downward is attached to this annular protrusion 10, and an annular space S1 is defined between the outer surface of the annular protrusion 10 and the inner surface of the stalk 2.
また、中間ストーク９外側にはヒータ１２を巻回すると
ともに、上端には湯口板１３を取付けている。この湯口
板１３には前記ランナ８に一致する湯口１４を形威し、
下面には下方への環状突出部１５を設け、この環状突出
部１５外側面と中間ストーク内側面との間に環状の空間
部Ｓ２を画成している。そして、各空間部Ｓｔ、Ｓ２は
アッキュムレータ等の蓄圧タンク１６．１７及びバルブ
１８を介して不活性ガスの供給源１９につながっている
。Further, a heater 12 is wound around the outside of the intermediate stalk 9, and a sprue plate 13 is attached to the upper end. This sprue plate 13 has a sprue 14 that corresponds to the runner 8,
A downward annular protrusion 15 is provided on the lower surface, and an annular space S2 is defined between the outer surface of the annular protrusion 15 and the inner surface of the intermediate stalk. Each of the spaces St and S2 is connected to an inert gas supply source 19 via a pressure storage tank 16, 17 such as an accumulator and a valve 18.
以上の如き構成の低圧鋳造装置を用いて鋳造する方法を
以下に述べる。A method of casting using the low-pressure casting apparatus configured as described above will be described below.
先ず密閉容器１内に溶湯を入れ、バイブ３を介して密閉
容器１内にガスを供給して溶浸材を加圧する。そして溶
’ｔｌＡ Ｍの加圧開始と同時にバルブ１８を閉じてお
く。First, a molten metal is placed in the closed container 1, and gas is supplied into the closed container 1 via the vibrator 3 to pressurize the infiltration material. Then, the valve 18 is closed at the same time as the pressurization of molten AM starts.
加圧された溶湯Ｍはストーク２、中間ストーク９内を上
昇し、湯口１４及びランナ８を介してキャビティ６内に
押し上げられる。モして溶湯Ｍが上昇する際、空間部Ｓ
ｌ、Ｓ２を画成する溶湯面は突出部１０．１５下端より
も上方にあるため、空間部Ｓｌ、Ｓ２内の不活性ガスが
キャビティ６内に巻込まれることはない。また、溶湯Ｍ
の熱によって空間部Ｓｔ、Ｓ２内の不活性ガスが膨張す
るが蓄圧タンク１６．１７が当該膨張分を吸収する。The pressurized molten metal M rises inside the stalk 2 and the intermediate stalk 9, and is pushed up into the cavity 6 via the sprue 14 and the runner 8. When the molten metal M rises, the space S
Since the molten metal surface defining S1 and S2 is located above the lower end of the protrusion 10.15, the inert gas in the spaces S1 and S2 is not drawn into the cavity 6. Also, molten metal M
The inert gas in the spaces St and S2 expands due to the heat, but the pressure storage tanks 16 and 17 absorb the expansion.
一方、キャビティ６内に充填した溶湯Ｍが凝固したなら
ば、密閉容器１内の溶湯Ｍへの加圧を解除するとともに
バルブ１８を開とした状態で離型して製品を払出す。こ
のとき中間ストーク９内の溶湯面は第２図に示すように
突出部１５下端よりも下降するが、空間部Ｓ２には不活
性ガス供給源１９からの不活性ガスが供給されるため、
中間ストーク９内は負圧にならず、したがって離型時に
外気が溶湯表面に接触することがない。On the other hand, once the molten metal M filled in the cavity 6 has solidified, the pressure on the molten metal M in the closed container 1 is released and the product is released by releasing the mold with the valve 18 open. At this time, the molten metal surface in the intermediate stalk 9 falls below the lower end of the protrusion 15 as shown in FIG. 2, but since the space S2 is supplied with inert gas from the inert gas supply source 19,
There is no negative pressure inside the intermediate stalk 9, so that outside air does not come into contact with the surface of the molten metal during demolding.
（発明の効果）
以上に説明した如く本発明によれば、溶湯の供給路の一
部に不活性ガス供給源につながる空間部を形成し、離型
時のみ当該空間部を介して溶湯表面に不活性ガスを供給
するようにしたので、ガスや酸化物の巻込みによる鋳造
欠陥のない高品質の鋳物が得られる。(Effects of the Invention) As explained above, according to the present invention, a space connected to an inert gas supply source is formed in a part of the molten metal supply path, and the surface of the molten metal is passed through the space only during mold release. Since an inert gas is supplied, high quality castings without casting defects due to gas or oxide entrainment can be obtained.
第１図は本発明に係る低圧鋳造装置の全体断面図、第２
図は同低圧鋳造装置の要部拡大断面図である。
尚、図面中１は密閉容器、２はストーク、５は鋳型、６
はキャビティ、９は中間ストーク、１０．１５は突出部
、１６．１７は不活性ガスの蓄圧タンク、１８はバルブ
、Ｍは溶湯、Ｓｌ。
Ｓ２は空間部である。Fig. 1 is an overall cross-sectional view of a low-pressure casting apparatus according to the present invention, Fig.
The figure is an enlarged cross-sectional view of essential parts of the same low-pressure casting apparatus. In addition, in the drawing, 1 is a closed container, 2 is a stalk, 5 is a mold, and 6
is a cavity, 9 is an intermediate stalk, 10.15 is a protrusion, 16.17 is an inert gas pressure accumulation tank, 18 is a valve, M is a molten metal, and Sl. S2 is a space part.
Claims (3)
トークを介して鋳型のキャビティ内へ溶湯を押上げて充
填するようにした低圧鋳造装置において、前記ストーク
の上端には中間ストークを設け、この中間ストークには
下方への環状突出部を形成してこの環状突出部とストー
ク内側面との間に空間部を画成し、この空間部を不活性
ガスの蓄圧タンクにつなげたことを特徴とする低圧鋳造
装置。(1) In a low-pressure casting device that pressurizes molten metal stored in a closed container to push the molten metal up and fill it into a mold cavity through a stalk, an intermediate stalk is provided at the upper end of the stalk. , a downward annular protrusion is formed on this intermediate stalk, a space is defined between this annular protrusion and the inner surface of the stalk, and this space is connected to an inert gas pressure accumulation tank. Characteristic low pressure casting equipment.
、この湯口板下面には下方への環状突出部を形成してこ
の環状突出部と中間ストーク内側面との間に空間部を画
成し、この空間部を不活性ガスの蓄圧タンクにつなげた
ことを特徴とする請求項（１）に記載の低圧鋳造装置。(2) A sprue plate is attached to the upper end of the intermediate stalk, and a downward annular protrusion is formed on the lower surface of the sprue plate to define a space between the annular protrusion and the inner surface of the intermediate stalk. The low-pressure casting apparatus according to claim 1, wherein the space is connected to an inert gas pressure accumulation tank.
トークを介して鋳型のキャビティ内へ溶湯を押上げて充
填するようにした低圧鋳造装置において、前記溶湯の湯
口に至るまでの流路の一部に不活性ガスの蓄圧タンクに
つながるとともに溶湯の湯面によつてその容積が変化す
る空間部を画成し、この空間部への不活性ガスの供給を
溶湯の加圧開始で停止し、加圧解除で開始するようにし
たことを特徴とする低圧鋳造方法。(3) In a low-pressure casting device that pressurizes the molten metal stored in a closed container, the molten metal is pushed up and filled into the cavity of the mold via a stalk, and the flow path for the molten metal up to the sprue. A part of the space is connected to an inert gas pressure accumulation tank and whose volume changes depending on the molten metal level, and the supply of inert gas to this space is stopped when the molten metal starts pressurizing. A low-pressure casting method characterized in that the process starts when the pressure is released.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20872989A JPH0371964A (en) | 1989-08-11 | 1989-08-11 | Apparatus and method for low pressure casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20872989A JPH0371964A (en) | 1989-08-11 | 1989-08-11 | Apparatus and method for low pressure casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0371964A true JPH0371964A (en) | 1991-03-27 |
Family
ID=16561112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20872989A Pending JPH0371964A (en) | 1989-08-11 | 1989-08-11 | Apparatus and method for low pressure casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0371964A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0518747U (en) * | 1991-08-14 | 1993-03-09 | 株式会社神戸製鋼所 | Mg alloy low pressure casting equipment |
| US5309975A (en) * | 1991-10-22 | 1994-05-10 | Hitachi Metals, Ltd. | Differential pressure casting process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5215525A (en) * | 1975-07-26 | 1977-02-05 | Basf Ag | Novel azo pigment |
-
1989
- 1989-08-11 JP JP20872989A patent/JPH0371964A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5215525A (en) * | 1975-07-26 | 1977-02-05 | Basf Ag | Novel azo pigment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0518747U (en) * | 1991-08-14 | 1993-03-09 | 株式会社神戸製鋼所 | Mg alloy low pressure casting equipment |
| US5309975A (en) * | 1991-10-22 | 1994-05-10 | Hitachi Metals, Ltd. | Differential pressure casting process |
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