JPH07256432A - Reduced pressure suction casting apparatus using sand mold - Google Patents
Reduced pressure suction casting apparatus using sand moldInfo
- Publication number
- JPH07256432A JPH07256432A JP6076495A JP7649594A JPH07256432A JP H07256432 A JPH07256432 A JP H07256432A JP 6076495 A JP6076495 A JP 6076495A JP 7649594 A JP7649594 A JP 7649594A JP H07256432 A JPH07256432 A JP H07256432A
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- JP
- Japan
- Prior art keywords
- mold
- molten metal
- tubular member
- sand mold
- chamber
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、砂型と減圧吸引鋳造と
を組み合わせることにより、砂型のキャビティに溶湯を
吸い上げて鋳込む装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for sucking and casting molten metal into a cavity of a sand mold by combining a sand mold and vacuum suction casting.
【０００２】[0002]
【従来の技術】従来、例えば図７に示すように、チャン
バ１００に砂型１０１を気密に保持し、この砂型１０１
の下端部を、溶解炉１０２等の溶湯中に浸漬した状態
で、チャンバ１００内ひいてはキャビティ１０３内を減
圧し、ここに適数の湯道１０４から溶湯を吸い上げて鋳
込む装置が知られている。2. Description of the Related Art Conventionally, for example, as shown in FIG. 7, a sand mold 101 is hermetically held in a chamber 100 and
There is known a device in which the lower end of the chamber is immersed in the molten metal in the melting furnace 102 or the like, the pressure inside the chamber 100 and then the cavity 103 is reduced, and the molten metal is sucked up from a suitable number of runners 104 and cast therein. .
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、溶解炉
１０２の直径を超える砂型を必要とする長尺品あるいは
大型品は、鋳造することが困難であった。そのため、溶
解炉の直径より長い長尺品等は、分割して鋳造し、それ
を溶接でつなぎ合わせて一体としているが、これでは生
産性が悪く、コストも嵩む。However, it is difficult to cast a long product or a large product which requires a sand mold having a diameter exceeding the diameter of the melting furnace 102. Therefore, long products having a diameter longer than that of the melting furnace are divided and cast, and they are joined together by welding, but this leads to poor productivity and high cost.
【０００４】本発明の課題は、溶解炉の大きさを超える
長尺あるいは大型の鋳物でも、減圧吸引方式により容易
に鋳込むことのできる装置を提供することにある。An object of the present invention is to provide an apparatus which can easily cast a long or large casting exceeding the size of a melting furnace by a vacuum suction method.
【０００５】[0005]
【課題を解決するための手段】本発明では、チャンバに
保持される砂型の下端部から、下方へ垂下する垂下部を
設けるとともに、この垂下部内に溶湯を吸い上げる湯道
を形成したものである。According to the present invention, a drooping part is provided which hangs downward from the lower end of a sand mold held in a chamber, and a runner for sucking the molten metal is formed in this drooping part.
【０００６】この垂下部としては、管状部材を用いるこ
とができる。ここで、上述の砂型をキャビティを備えた
主型と、その主型の下側に密着する下型を含んで構成す
るものとすれば、管状部材の上側部分を下型に埋め込ん
で、それと一体化することができる。A tubular member can be used as the hanging portion. Here, if the sand mold described above is configured to include a main mold having a cavity and a lower mold that closely adheres to the lower side of the main mold, the upper part of the tubular member is embedded in the lower mold and integrated with it. Can be converted.
【０００７】その際、管状部材の下側に埋め込まれる部
分に、落下防止用の突起部又は凹部を設けることができ
る。さらに、管状部材の材質として、溶湯と同種の金属
を用いるとともに、少なくとも溶湯に浸漬される部分の
外周面にセラミックスをコーティングすることができ
る。At this time, a protrusion or a recess for preventing falling can be provided in a portion to be embedded under the tubular member. Further, as the material of the tubular member, the same kind of metal as the molten metal can be used, and at least the outer peripheral surface of the portion immersed in the molten metal can be coated with ceramics.
【０００８】[0008]
【作用】本発明では、砂型の下端部が直接溶湯に浸漬さ
れるのではなく、その下端部から下方に延びる垂下部が
溶湯に浸漬させられる。その状態で、チャンバ内が減圧
されることにより、砂型を介してその垂下部内の湯道を
経て砂型のキャビティ内に溶湯が吸い上げられ、鋳込み
が行われる。In the present invention, the lower end of the sand mold is not directly immersed in the molten metal, but the hanging portion extending downward from the lower end is immersed in the molten metal. By depressurizing the inside of the chamber in that state, the molten metal is sucked up into the cavity of the sand mold through the sand mold through the runner in the hanging portion, and casting is performed.
【０００９】[0009]
【実施例】以下、本発明の幾つかの実施例を図面に基づ
いて説明する。 （実施例１）図１において１はチャンバである。チャン
バ１は、図示しない昇降手段（例えばピニオン・ラック
機構、シリンダ等）により吊下げ支持され、ほぼ円筒状
の本体１ａと、その上部開口を覆う蓋部材１ｂとを備え
ている。このチャンバ１に、シェル鋳型や自硬性鋳型か
らなる通気性を有する砂型２が気密に保持されている。
砂型２は横方向に長いキャビティ３を形成する主型４
と、この下側に位置する下型５とを備えている。主型４
は第１型４ａと第２型４ｂとが水平割の形態で、糊付け
等により接合されたものである。下側に位置する第２型
４ｂには、キャビティ３から下方へ開口する適当数の湯
道（ゲート）６が形成されている。下型５は主型４と同
様に砂型で形成され、その上面が主型４（第２型４ｂ）
の下面に糊付け等で一体化されるとともに、その上部に
湯溜り７が形成されている。そして、この湯溜り７の中
心部に連通するように、下型５に垂下部としての管状部
材８が設けられている。なお、図中３ａは中空製品を鋳
造する場合にセットされる中子である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) In FIG. 1, 1 is a chamber. The chamber 1 is suspended and supported by an elevating means (not shown) (for example, a pinion rack mechanism, a cylinder, etc.), and includes a substantially cylindrical main body 1a and a lid member 1b that covers an upper opening thereof. An air-permeable sand mold 2 made of a shell mold or a self-hardening mold is airtightly held in the chamber 1.
The sand mold 2 is a main mold 4 that forms a cavity 3 that is long in the lateral direction.
And a lower die 5 located on the lower side. Main mold 4
The first mold 4a and the second mold 4b are horizontally split and joined by gluing or the like. An appropriate number of runners (gates) 6 that open downward from the cavities 3 are formed in the second mold 4b located on the lower side. The lower mold 5 is formed of a sand mold like the main mold 4, and the upper surface thereof is the main mold 4 (second mold 4b).
It is integrated with the lower surface of the unit by gluing or the like, and a hot water pool 7 is formed on the upper part thereof. A tubular member 8 as a hanging portion is provided on the lower mold 5 so as to communicate with the center of the basin 7. In the figure, 3a is a core that is set when a hollow product is cast.
【００１０】管状部材８は例えば円筒状の部材であり、
その上端部が下型５に埋設されることにより、下型５か
ら垂下した形態で支持されている。この管状部材８の埋
設部に、外方に突出する突起部８ａを設ければ、下型５
からの抜け防止に有効である。突起部８ａの他に、複数
個の独立した凹部やリング状凹部によっても砂が食込
み、同様の効果が得られる。凹凸を連続して設けたねじ
山群やローレット掛け面でもよい。ここで、下型５の造
型に当っては、管状部材８を中央に位置させた状態で砂
込めすることにより、下型５と管状部材８とが容易に一
体化できる。管状部材８は下型５の中央に限らず、偏っ
ていてもよい。この下型５は管状部材８を主型４と一体
化させるための結合部分とも言える。The tubular member 8 is, for example, a cylindrical member,
By embedding the upper end portion in the lower mold 5, the upper end is supported in a form hanging from the lower mold 5. If the protruding portion 8a protruding outward is provided in the embedded portion of the tubular member 8, the lower mold 5
It is effective in preventing slipping out. In addition to the protrusion 8a, sand is also bitten by a plurality of independent recesses or ring-shaped recesses, and the same effect can be obtained. It may be a thread group or knurling surface in which irregularities are continuously provided. Here, in molding the lower mold 5, the lower mold 5 and the tubular member 8 can be easily integrated by sand-filling with the tubular member 8 positioned in the center. The tubular member 8 is not limited to the center of the lower mold 5 and may be biased. The lower mold 5 can also be said to be a connecting portion for integrating the tubular member 8 with the main mold 4.
【００１１】管状部材８の材質は、例えば軟鋼、陶管、
あるいは金網パイプにセラミックをコーティングしたも
の（例えばロストワックスセラミックシェル）もしくは
耐熱性のある酸化物や窒化物（例えば窒化ボロン：Ｂ
Ｎ）等を好適に採用することができる。The material of the tubular member 8 is, for example, mild steel, ceramic pipe,
Alternatively, a wire mesh pipe coated with ceramic (eg, lost wax ceramic shell) or a heat-resistant oxide or nitride (eg, boron nitride: B)
N) and the like can be preferably adopted.
【００１２】ここで、管状部材８を金属製のものとする
場合、その材質を溶湯と同種のものとすることができ
る。例えば溶湯が鋼であれば、管状部材８を軟鋼製のも
のとする。その場合、さらに管状部材８の外周面の全部
又は溶湯に浸漬される部分のみに、セラミックス（例え
ばアルミナ系、ジルコニア系等）８ｂをコーティングす
ることができる。これにより管状部材８の溶湯に対する
耐熱性が高められる。Here, when the tubular member 8 is made of metal, the material may be the same as that of the molten metal. For example, if the molten metal is steel, the tubular member 8 is made of mild steel. In that case, ceramics (for example, alumina-based, zirconia-based, etc.) 8b can be coated on the entire outer peripheral surface of the tubular member 8 or only on the portion immersed in the molten metal. As a result, the heat resistance of the tubular member 8 to the molten metal is enhanced.
【００１３】なお、管状部材８の内側空間は、溶湯の湯
道９となるが、ここにセラミックスがコーティングされ
ると、その粒子が溶湯中に混入することも考えられるの
で、内周面（湯道９）は地肌のままとすることが望まし
い。管状部材８の下端部が溶湯へ浸漬された際、管状部
材８がわずかに溶け出すことがあったとしても、溶湯の
組成上は問題が生じないし、仮に管状部材８の金属組成
と溶湯のそれとが多少違っていたとしても、実際はほと
んど問題はないといえる。The inner space of the tubular member 8 serves as a runner 9 for the molten metal. However, if ceramics are coated on the inner space, particles of the ceramic may be mixed into the molten metal. It is desirable that the road 9) is left bare. Even if the tubular member 8 may slightly melt when the lower end of the tubular member 8 is immersed in the molten metal, no problem occurs in the composition of the molten metal, and if the metallic composition of the tubular member 8 and that of the molten metal Even if it is a little different, it can be said that there is practically no problem.
【００１４】下型５の湯溜り７は、その上側のキャビテ
ィ３に対する湯回りを良好にする役割を果たし、さらに
押湯として作用する。これが不可欠というわけでなく省
略することもできる。このような湯溜り７を設ける場
合、その形態としては例えば図２に示すように、平面視
で２個取りのキャビティ３があるとすれば、これを包含
するプール状の形態とすることもできるし、図３に示す
ように、放射状のものとすることもできる。The basin 7 of the lower mold 5 plays a role of improving the wrapping around the cavity 3 on the upper side thereof, and further functions as a feeder. This is not essential and can be omitted. When such a basin 7 is provided, for example, as shown in FIG. 2, if there are two cavities 3 in a plan view, the basin 7 may be in a pool shape. However, as shown in FIG. 3, it may be radial.
【００１５】上記のような主型４及び下型５からなる砂
型２及びこれに一体化された管状部材８を備えた型ユニ
ットは、例えばチャンバ１の下側開口部に下方から押し
込まれてそのチャンバ１に気密に保持される。その場
合、チャンバ１の下端開口部の内側には、下向きに広が
るテーパ内周面１０が形成され、主型４（第１型４ａ）
の上部にはこれに対応するテーパ外周面１１が形成され
る。また、チャンバ１から露出する主型４の外周面、下
型５の外周面及び底面には気密性を確保するシール材が
塗布される。The mold unit having the sand mold 2 composed of the main mold 4 and the lower mold 5 and the tubular member 8 integrated with the sand mold 2 as described above is pushed into the lower opening of the chamber 1 from below, for example. It is kept airtight in the chamber 1. In that case, a tapered inner peripheral surface 10 that spreads downward is formed inside the lower end opening of the chamber 1, and the main mold 4 (first mold 4a) is formed.
A tapered outer peripheral surface 11 corresponding to this is formed on the upper part of the. Further, a sealing material that ensures airtightness is applied to the outer peripheral surface of the main mold 4, the outer peripheral surface and the bottom surface of the lower mold 5, which are exposed from the chamber 1.
【００１６】加熱コイル１３を備えた溶解炉１２の内径
は、砂型２の外径より小さくても、チャンバ１の下降に
より管状部材８の下端部が溶解炉１２内の溶湯中に浸漬
させられる。その状態でチャンバ１が減圧され、砂型２
の通気性に基づいてキャビティ３が減圧されることによ
り、溶湯は管状部材８、湯溜り７さらにゲート６を経て
キャビティ３に吸い上げられ、所定時間保持されること
により鋳込みが完了する。その後、減圧状態が解除され
ると、湯溜り７や管状部材８内の溶湯の多くは自重で溶
解炉１２中に戻る。Even if the inner diameter of the melting furnace 12 equipped with the heating coil 13 is smaller than the outer diameter of the sand mold 2, the lower end of the tubular member 8 is immersed in the molten metal in the melting furnace 12 as the chamber 1 descends. In that state, the chamber 1 is depressurized and the sand mold 2
When the cavity 3 is depressurized based on the air permeability, the molten metal is sucked up into the cavity 3 through the tubular member 8, the molten metal pool 7 and the gate 6, and is held for a predetermined time to complete the casting. After that, when the depressurized state is released, most of the molten metal in the pool 7 and the tubular member 8 returns to the melting furnace 12 by its own weight.
【００１７】（実施例２）図４に示すものでは、チャン
バ１の下端開口部に下向きに縮径するテーパ内周面１５
が、また下型５にはこれに対応するテーパ外周面１６が
形成されている。そして、主型４及び下型５は糊付け等
により相互に一体化され、かつ下型５に管状部材８が結
合されている。このような型ユニットが、チャンバ１の
蓋部材１ｂを開けた状態で上から挿入され、図示のよう
に気密に保持される。このように上から入れる形態で
は、砂型２の浮き上がりを防止する押え部材として、例
えば押えねじ部材１７を設けることが望ましい。また、
下型１６のチャンバ１の本体１ａから露出する部分は、
前述のように通気性を遮断するシール材がコーティング
される。(Embodiment 2) In the embodiment shown in FIG. 4, the taper inner peripheral surface 15 having a downward diameter reduced at the lower end opening of the chamber 1.
However, the lower die 5 is also formed with a tapered outer peripheral surface 16 corresponding thereto. The main mold 4 and the lower mold 5 are integrated with each other by gluing or the like, and the tubular member 8 is bonded to the lower mold 5. Such a mold unit is inserted from above with the lid member 1b of the chamber 1 opened and is held airtight as shown in the figure. In the case of inserting from above, it is desirable to provide, for example, a holding screw member 17 as a holding member for preventing the sand mold 2 from rising. Also,
The portion of the lower die 16 exposed from the main body 1a of the chamber 1 is
As described above, a sealing material that blocks air permeability is coated.
【００１８】（実施例３）上記のような上入れ形態の場
合、図５のように、チャンバ１の下端部（本体１ａ）の
下端開口を塞ぐように底板１ｃを形成し、ここで砂型２
の全体を支持することも可能である。その場合、管状部
材８と底板１ｃを気密につなぐには、前述のような気密
用のシール材を用いることが望ましい。(Embodiment 3) In the case of the above-mentioned top loading form, as shown in FIG. 5, the bottom plate 1c is formed so as to close the lower end opening of the lower end portion (main body 1a) of the chamber 1, and here the sand mold 2 is formed.
It is also possible to support the whole of. In that case, in order to connect the tubular member 8 and the bottom plate 1c in an airtight manner, it is desirable to use the above-mentioned airtight sealing material.
【００１９】（実施例４）図６に示すものでは、管状部
材が用いられておらず、その代わりに下型５の下端部が
下方に向かって先細りとなるように突出させられて、こ
こが垂下部１８となっている。この垂下部１８の内側に
湯道９が形成されるとともに、垂下部１８のチャンバ１
から露出した外周面に、気密用のシール材が塗布され
る。そして、このような垂下部１８の下端部が溶湯中に
浸漬させられることとなる。(Embodiment 4) In the embodiment shown in FIG. 6, a tubular member is not used, but instead, the lower end of the lower mold 5 is made to project downward so as to taper, and this is here. It is the hanging part 18. The runner 9 is formed inside the hanging part 18, and the chamber 1 of the hanging part 18 is formed.
A sealing material for airtightness is applied to the outer peripheral surface exposed from. Then, the lower end portion of the hanging portion 18 is immersed in the molten metal.
【００２０】[0020]
【発明の効果】本発明によれば、砂型を溶解炉等の溶湯
収容部に浸漬させることができなくても、垂下部を介し
て溶湯の吸引ができ、したがって、溶解炉等の直径を超
える長尺品又は大型品の鋳造も容易に行うことができ
る。According to the present invention, even if the sand mold cannot be immersed in the molten metal container such as the melting furnace, the molten metal can be sucked through the hanging portion, and therefore the diameter of the melting furnace or the like is exceeded. A long product or a large product can be easily cast.
【００２１】その垂下部は、砂型の一部を下方に突出さ
せて形成してもよいが、管状部材を用いてこれを砂型内
に埋め込めば、容易に垂下部が形成される。その際、管
状部材の埋込み部に落下防止用の突起部や凹部を形成す
れば、管状部材と下型（砂型）との一体性がより高めら
れる。The hanging part may be formed by projecting a part of the sand mold downward, but the hanging part can be easily formed by embedding it in the sand mold using a tubular member. At this time, by forming a drop-preventing projection or recess in the embedded portion of the tubular member, the integrity of the tubular member and the lower mold (sand mold) is further enhanced.
【００２２】なお、管状部材は種々の材料を用いること
ができるが、溶湯と同種の金属から構成した場合には、
溶湯中に浸漬された管状部材が仮に溶湯中に溶け出した
としても、溶湯の組成に何ら影響を及ぼさず、かつセラ
ミックのコーティングにより耐熱性が向上する。Although various materials can be used for the tubular member, when the tubular member is made of the same metal as the molten metal,
Even if the tubular member immersed in the molten metal melts out into the molten metal, it has no effect on the composition of the molten metal and the ceramic coating improves the heat resistance.
【図１】本発明の実施例１の断面図。FIG. 1 is a sectional view of a first embodiment of the present invention.
【図２】その湯溜り部の一例を示す平面図。FIG. 2 is a plan view showing an example of the hot water pool portion.
【図３】同じく湯溜り部の別の一例を示す平面図。FIG. 3 is a plan view showing another example of the hot water pool portion.
【図４】実施例２の断面図。FIG. 4 is a sectional view of the second embodiment.
【図５】実施例３の断面図。FIG. 5 is a sectional view of the third embodiment.
【図６】実施例４の断面図。FIG. 6 is a sectional view of the fourth embodiment.
【図７】従来例の断面図。FIG. 7 is a sectional view of a conventional example.
１ チャンバ ２ 砂型 ３ キャビティ ４ 主型 ４ａ 第１型 ４ｂ 第２型 ５ 下型 ７ 湯溜り ８ 管状部材（垂下部） ９ 湯道 １２ 溶解炉 １８ 垂下部 1 Chamber 2 Sand Mold 3 Cavity 4 Main Mold 4a 1st Mold 4b 2nd Mold 5 Lower Mold 7 Hot Water Pool 8 Tubular Member (Suspended Part) 9 Runway 12 Melting Furnace 18 Suspended Part
Claims (3)
間を減圧することにより前記砂型のキャビティに溶湯を
吸い上げて鋳込む鋳造装置において、 前記チャンバに保持される砂型の下端部から、下方へ垂
下して前記溶湯中に浸漬される垂下部が設けられ、この
垂下部内に溶湯を吸い上げる湯道が形成されていること
を特徴とする砂型を用いた減圧吸引鋳造装置。1. A casting apparatus for sucking molten metal into a cavity of the sand mold for casting by depressurizing an inner space of a chamber in which the sand mold is airtightly held, wherein the casting mold droops downward from a lower end portion of the sand mold held in the chamber. Then, a vacuum suction casting apparatus using a sand mold is provided, in which a drooping part to be immersed in the molten metal is provided, and a runner for sucking up the molten metal is formed in the drooping part.
型と、その主型の下側に密着する下型とを備え、 一方、前記垂下部は、管状部材で形成され、かつ、前記
下型にその上側部分が埋め込まれてその下型と一体化さ
れている請求項１記載の鋳造装置。2. The sand mold includes a main mold having a cavity formed therein and a lower mold that is in close contact with the lower side of the main mold, while the hanging portion is formed of a tubular member and the lower mold is formed. The casting apparatus according to claim 1, wherein an upper part of the mold is embedded in the mold and integrated with the lower mold.
る部分に、落下防止用の突起部又は凹部を有している請
求項１又は２記載の鋳造装置。3. The casting apparatus according to claim 1, wherein the tubular member has a protrusion portion or a recess portion for preventing falling in a portion embedded in the lower side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6076495A JPH07256432A (en) | 1994-03-22 | 1994-03-22 | Reduced pressure suction casting apparatus using sand mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6076495A JPH07256432A (en) | 1994-03-22 | 1994-03-22 | Reduced pressure suction casting apparatus using sand mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07256432A true JPH07256432A (en) | 1995-10-09 |
Family
ID=13606808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6076495A Pending JPH07256432A (en) | 1994-03-22 | 1994-03-22 | Reduced pressure suction casting apparatus using sand mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07256432A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108311673A (en) * | 2018-03-27 | 2018-07-24 | 苏州市通润机械铸造有限公司 | A kind of molten metal feed liquid method of low pressure casting |
| CN111741851A (en) * | 2018-01-26 | 2020-10-02 | 格拉夫股份公司 | Printing head for three-dimensional printing of molten metal |
-
1994
- 1994-03-22 JP JP6076495A patent/JPH07256432A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111741851A (en) * | 2018-01-26 | 2020-10-02 | 格拉夫股份公司 | Printing head for three-dimensional printing of molten metal |
| CN108311673A (en) * | 2018-03-27 | 2018-07-24 | 苏州市通润机械铸造有限公司 | A kind of molten metal feed liquid method of low pressure casting |
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|---|---|---|---|
| A02 | Decision of refusal |
Effective date: 20040309 Free format text: JAPANESE INTERMEDIATE CODE: A02 |