JP3044598B2 - Melting / casting method - Google Patents
Melting / casting methodInfo
- Publication number
- JP3044598B2 JP3044598B2 JP7188205A JP18820595A JP3044598B2 JP 3044598 B2 JP3044598 B2 JP 3044598B2 JP 7188205 A JP7188205 A JP 7188205A JP 18820595 A JP18820595 A JP 18820595A JP 3044598 B2 JP3044598 B2 JP 3044598B2
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- melting
- crucible
- melting crucible
- snout
- 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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- Crucibles And Fluidized-Bed Furnaces (AREA)
- Furnace Details (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は溶解・鋳造方法に関
し、更に詳しくは、溶解用ルツボの内部に装入した材料
を誘導加熱し、その溶解した溶湯を溶解用ルツボの内壁
面に接触させることなく保持するレビテーション(磁気
浮揚)溶解方法により得られた溶湯を鋳型に鋳込む溶解
・鋳造方法に関するものである。FIELD OF THE INVENTION The present invention relates to dissolve and casting method, and more particularly, the material was charged inside the melting crucible and the induction heating, contacting the dissolved molten metal to the inner wall surface of the melting crucible Levitation (magnetic
More resulting molten metal levitation) dissolved how it relates to a method melting and casting casting into a mold.
【０００２】[0002]
【従来技術】各種の金属材料を溶解用ルツボに装入して
溶解するに際し、溶解された溶湯がルツボ内壁面に接触
して生ずる化学反応により汚染されるのを防止して品質
向上を達成する溶解方法の一つとして、レビテーション
溶解方法が知られている。このレビテーション溶解方法
には、電磁気力によって溶湯を空間に完全に浮揚させる
フルレビテーション溶解方法と、水冷銅ルツボを用いて
材料の底部を凝固状態に保ちつつ電磁気力によって溶湯
を立ち上げるセミレビテーション溶解方法とがある。フ
ルレビテーション溶解方法では、溶湯を完全に浮揚させ
るため、溶解用ルツボからの汚染を完全に防止すること
はできるが、溶湯を浮揚状態に保持するのが難しく、ま
た浮揚させ得る溶湯の量は少ないため、工業的にはセミ
レビテーション溶解方法が応用されている。2. Description of the Related Art When various metal materials are charged into a melting crucible and melted, the melt is prevented from being contaminated by a chemical reaction caused by contacting the inner wall surface of the crucible, thereby improving quality. As one of the dissolution methods, a levitation dissolution method is known. This levitation melting method includes a full levitation melting method in which the molten metal is completely levitated in space by electromagnetic force, and a semi-levitation method in which the molten metal is started up by electromagnetic force while keeping the bottom of the material in a solidified state using a water-cooled copper crucible. Thawing method. In the full-levitation melting method, since the molten metal is completely levitated, contamination from the melting crucible can be completely prevented.However, it is difficult to maintain the molten metal in a floating state, and the amount of molten metal that can be levitated is Due to the small number, a semilevitation dissolution method is industrially applied.
【０００３】前記セミレビテーション溶解方法の概略を
説明すると、該溶解方法に使用される水冷銅ルツボは、
有底円筒形状に形成された本体の周壁が、その周方向に
分割されて内部に冷却水が循環供給される複数のセグメ
ントで構成されると共に、各セグメントは絶縁材料によ
り相互に絶縁状態を保持するようになっている。また、
水冷銅ルツボの外側にはドーナツ状に高周波誘導コイル
が所要の環状間隙を保持して配置されており、該ルツボ
の内部に材料を装入すると共に、誘導コイルに高周波電
流を通電することにより材料が誘導加熱される。そして
材料が所要温度まで加熱されると、該材料は水冷銅ルツ
ボの内底部に接触する底部を凝固状態に保ちつつ一部が
溶解し、その溶湯がルツボ内に浸透する電磁気力によっ
て内壁面に対して非接触状態で立ち上げ保持される。[0003] The outline of the semi-levitation dissolution method will be described. The water-cooled copper crucible used for the dissolution method is as follows.
The peripheral wall of the main body formed into a bottomed cylindrical shape is composed of a plurality of segments that are divided in the circumferential direction and cooling water is circulated and supplied inside, and each segment maintains an insulating state mutually with an insulating material It is supposed to. Also,
A doughnut-shaped high-frequency induction coil is arranged outside the water-cooled copper crucible in a donut shape while maintaining a required annular gap, and a material is charged into the crucible and a high-frequency current is applied to the induction coil to supply the material. Is induction heated. When the material is heated to the required temperature, the material partially melts while keeping the bottom part in contact with the inner bottom part of the water-cooled copper crucible in a solidified state, and the molten metal is applied to the inner wall surface by electromagnetic force penetrating into the crucible. On the other hand, it is started up and held in a non-contact state.
【０００４】[0004]
【発明が解決しようとする課題】前述したセミレビテー
ション溶解方法においては、水冷銅ルツボの内壁面に非
接触状態で立ち上げ保持された溶湯の過熱度(金属材料
の融点を基準(０℃)とする温度＝スーパーヒート)を適
正に保持する必要がある。すなわち、セミレビテーショ
ン溶解方法により得られた溶湯を鋳型に鋳込む際に、該
溶湯の温度が低いと湯回り不良を来たして製品に欠陥を
生じ、また溶湯の温度が高いと鋳型自体を損傷させるお
それがあるからである。In the above-described semi-levitation melting method, the degree of superheat of the molten metal which is raised and held in a non-contact state on the inner wall surface of the water-cooled copper crucible (based on the melting point of the metal material (0 ° C.)) Temperature = superheat) must be properly maintained. That is, when the molten metal obtained by the semi-levitation melting method is cast into a mold, if the temperature of the molten metal is low, the run of the molten metal becomes poor, causing defects in the product, and if the temperature of the molten metal is high, the mold itself is damaged. This is because there is a risk of causing this.
【０００５】しかるに、水冷銅ルツボ内での溶湯の状態
(立ち上げ保持状態)をどのような条件で設定すれば、溶
湯をルツボ内壁面に接触させることなく安定保持したも
とで、該溶湯を適正な過熱度に保持し得るものであるか
は、確立されていなかった。また、品質の良い鋳物製品
を鋳造するには、セミレビテーション溶解方法により得
られた汚染されていない溶湯を清浄なまま鋳型に鋳込む
必要があるが、この鋳込み方法および鋳込み作業を効率
的に行なうための諸条件も確立されていないのが現状で
あった。[0005] However, the state of the molten metal in the water-cooled copper crucible
Under what conditions are set in the (start-up holding state), under the condition that the molten metal is stably held without being brought into contact with the inner wall surface of the crucible, it is possible to maintain the molten metal at an appropriate degree of superheating. Had not been established. In addition, in order to cast a high-quality cast product, it is necessary to cast the uncontaminated molten metal obtained by the semi-levitation melting method into a mold while keeping it clean. At the present time, various conditions for performing the tests have not been established.
【０００６】[0006]
【発明の目的】この発明は、前述した溶解・鋳造方法に
内在している前記欠点に鑑み、これを好適に解決するべ
く提案されたものであって、溶解用ルツボ内での溶湯を
適正な状態で保持することができ、また溶湯の効率的な
鋳込みを達成し得る溶解・鋳造方法を提供することを目
的とする。SUMMARY OF THE INVENTION The present invention, in view of the above disadvantages inherent in the dissolve and casting method described above, which has been proposed to suitably solve this, the molten metal in the melting for the crucible can be held in an appropriate state, also aims to provide a dissolve-casting method that give to achieve efficient casting of the molten metal.
【０００７】[0007]
【０００８】[0008]
【０００９】[0009]
【課題を解決するための手段】前述の課題を克服し、所
期の目的を達成するため本発明に係る溶解・鋳造方法
は、溶解用ルツボの外側に巻回した高周波誘導コイルに
高周波電流を流すことにより、前記溶解用ルツボ内に装
入した材料を誘導加熱し、その底部を凝固状態に保ちつ
つ溶解した溶湯を溶解用ルツボの内壁面に対して非接触
状態で立ち上げ、この溶湯を鋳型に鋳込む溶解・鋳造方
法において、前記溶解用ルツボ内における溶湯中央の高
さＨと、溶解用ルツボの内径Ｄとの関係が、Ｈ／Ｄ＞
０.５となる状態で溶解を行ない、前記溶解用ルツボの
上方からスノートを垂下し、その下端を溶湯に没入させ
て、該スノートの下端の高さＨ 1 を、溶解用ルツボの内
底部より５mm以上高い位置とすると共に、該スノートの
没入長さＨ 2 を、１０mm以上に保った状態で、該スノー
トを介して溶湯を鋳型内へ注湯することを特徴とする。SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and achieve the intended object, a melting / casting method according to the present invention provides a high-frequency current to a high-frequency induction coil wound outside a melting crucible. By flowing, the material charged in the melting crucible is induction-heated, and the molten metal is started up in a non-contact state with respect to the inner wall surface of the melting crucible while keeping the bottom in a solidified state, and the molten metal is heated. In the melting / casting method for casting in a mold, the relationship between the height H of the center of the molten metal in the melting crucible and the inner diameter D of the melting crucible is H / D>
Melting is performed in a state of 0.5, a snout is hung from above the melting crucible, and the lower end is immersed in the molten metal, and the height H 1 of the lower end of the snout is set in the melting crucible.
At least 5mm higher than the bottom,
Immersive length H 2, while maintaining the above 10 mm, characterized by pouring molten metal into the mold through the snout.
【００１０】前記目的を達成するため、本願の別の発明
に係る溶解・鋳造方法は、溶解用ルツボの外側に巻回し
た高周波誘導コイルに高周波電流を流すことにより、前
記溶解用ルツボ内に装入した材料を誘導加熱し、その底
部を凝固状態に保ちつつ溶解した溶湯を溶解用ルツボの
内壁面に対して非接触状態で立ち上げ、この溶湯を鋳型
に鋳込む溶解・鋳造方法において、前記溶解用ルツボ内
における溶湯中央の高さＨの１／２の位置での溶湯の外
表面と、溶解用ルツボの内壁面との隙間Ｓを３〜１０mm
の範囲で溶解を行ない、前記溶解用ルツボの上方からス
ノートを垂下し、その下端を溶湯に没入させて、該スノ
ートの下端の高さＨ 1 を、溶解用ルツボの内底部より５m
m以上高い位置とすると共に、該スノートの没入長さＨ 2
を、１０mm以上に保った状態で、該スノートを介して溶
湯を鋳型内へ注湯することを特徴とする。[0010] To achieve the above object, a melting and casting method according to another invention of the present application provides a melting and casting method in which a high-frequency current is caused to flow through a high-frequency induction coil wound around the melting crucible. The molten material is heated by induction heating, and the molten metal is started up in a non-contact state with respect to the inner wall surface of the melting crucible while keeping the bottom in a solidified state, and the molten metal is cast into a mold. The gap S between the outer surface of the molten metal at half the height H at the center of the molten metal in the melting crucible and the inner wall surface of the melting crucible is 3 to 10 mm.
The melting is performed within the range described above, and a snort is dripped from above the melting crucible, and the lower end thereof is immersed in the molten metal, and the snow is removed.
The height H 1 of the lower end of the plate is 5 m from the inner bottom of the melting crucible.
m or more, and the immersion length H 2 of the snout
Is poured into the mold through the snout while keeping the length at 10 mm or more .
【００１１】[0011]
【実施例】次に、本発明に係る溶解・鋳造方法につき、
好適な実施例を挙げて、添付図面を参照しながら以下説
明する。EXAMPLES Next, a locking Ru dissolve and casting method of the present invention,
Preferred embodiments will be described below with reference to the accompanying drawings.
【００１２】図１は、レビテーション溶解方法を実施す
る溶解装置の概略構成図であって、該溶解装置１０を構
成する溶解用ルツボ１２は、銅を材質として有底円筒形
状に形成され、その周壁には周方向に所要間隔で複数の
スリット１４が形成されている。各スリット１４は、溶
解用ルツボ１２における径方向の内外方向に開放すると
共に軸方向に所要長さで延在して、該スリット１４の形
成部位においてルツボ１２の周壁は周方向に分割された
複数のセグメント１６により構成される。また各スリッ
ト１４には、耐火セラミック等の絶縁材料１８が充填さ
れており、これにより各セグメント１６は相互に絶縁状
態を保持するようになっている。FIG. 1 is a schematic structural view of a melting apparatus for carrying out a levitation melting method. A melting crucible 12 constituting the melting apparatus 10 is formed in a bottomed cylindrical shape using copper as a material. A plurality of slits 14 are formed on the peripheral wall at required intervals in the circumferential direction. Each slit 14 is opened in a radially inward and outward direction in the melting crucible 12 and extends in a required length in the axial direction, and a peripheral wall of the crucible 12 is divided at a portion where the slit 14 is formed. Of the segment 16. Each slit 14 is filled with an insulating material 18 such as a refractory ceramic, so that each segment 16 maintains an insulating state mutually.
【００１３】前記各セグメント１６の内部には、冷却水
が循環供給される通路(図示せず)がスリット１４と平行
に形成され、該通路を循環する冷却水により溶解用ルツ
ボ１２を冷却するよう構成してある。また、溶解用ルツ
ボ１２の外側にドーナツ状に高周波誘導コイル２０が所
要の環状間隙を保持して配置され、該誘導コイル２０に
高周波電流を流すことにより、該ルツボ１２の内部に装
入した材料２２を誘導加熱するようになっている。な
お、溶解用ルツボ１２の内底部には、上面が円弧状に形
成された凝固シェル２４が形成され、その円弧状の炉底
部２４ａに材料２２が装入載置されるよう構成される。
これにより、凝固シェル２４の炉底部２４ａに装入され
た材料２２は、誘導加熱された際に該シェル２４に接触
する底部を凝固状態に保ちつつ溶解した溶湯２２ａを、
ルツボ内に浸透する電磁気力によって内壁面に対して非
接触状態で立ち上げるようになっている。Inside each of the segments 16, a passage (not shown) through which cooling water is circulated is formed in parallel with the slit 14, and the cooling water circulating through the passage cools the melting crucible 12. It is composed. Further, a high-frequency induction coil 20 is disposed in a donut shape outside the melting crucible 12 while maintaining a required annular gap, and a high-frequency current is caused to flow through the induction coil 20 so that the material charged inside the crucible 12 is formed. 22 is induction-heated. A solidified shell 24 having an arc-shaped upper surface is formed on the inner bottom of the melting crucible 12, and the material 22 is charged and placed on the arc-shaped furnace bottom 24a.
As a result, the material 22 charged in the furnace bottom 24a of the solidified shell 24 melts the molten metal 22a while keeping the bottom in contact with the shell 24 in a solidified state during induction heating.
It is designed to start up in a non-contact state with respect to the inner wall surface by the electromagnetic force penetrating into the crucible.
【００１４】(第１のレビテーション溶解方法について)
前述した構成の溶解装置１０により実施されるレビテー
ション溶解方法において、溶湯２２ａにおける中央の
高さＨと、溶解用ルツボ１２の内径Ｄとを、Ｈ／Ｄ＞
０.５の関係とすることにより、溶解用ルツボ１２の内
部で溶解された溶湯２２ａをルツボ内壁面に接触させる
ことなく安定的に保持したもとで、該溶湯２２ａの過熱
度を鋳造に適した温度に保つことができる。なお、溶湯
２２ａの中央高さＨは、図２に示すように、溶湯２２ａ
の立ち上がり下端部を下基準としている。すなわち、Ｈ
／Ｄが０.５以下となる場合は、溶解用ルツボ１２内で
の溶湯２２ａの中央高さＨは低く、該溶湯２２ａ上部と
炉底部２４ａとが近接するから、該炉底部２４ａからの
伝導熱ロスにより充分な過熱度に達しない場合がある。
しかも、溶湯２２ａが薄い偏平状となるため、鋳造に際
してスノート２６(後述)を溶湯２２ａ内に没入させるこ
とが極めて困難となる難点がある。これに対してＨ／Ｄ
を０.５より大きく設定した場合は、溶湯２２ａ上部と
炉底部２４ａとは充分に離間し、炉底部２４ａからの伝
導熱ロスにより過熱度が低くなるのを抑制し得る。しか
も、溶解用ルツボ１２の内径Ｄに対して溶湯２２ａの中
央高さＨを規定するから、立ち上げ保持された溶湯２２
ａがルツボ内壁面に接触するのも防止することができ
る。(First Levitation Melting Method)
In the levitation melting method performed by the melting device 10 having the above-described configuration, the height H at the center of the molten metal 22a and the inner diameter D of the melting crucible 12 are determined by H / D>
By setting the relationship of 0.5, the degree of superheat of the molten metal 22a is suitable for casting while the molten metal 22a melted inside the melting crucible 12 is stably held without coming into contact with the inner wall surface of the crucible. Temperature can be maintained. The center height H of the molten metal 22a is, as shown in FIG.
The lower end of the rising edge is used as the lower reference. That is, H
When / D is 0.5 or less, the center height H of the molten metal 22a in the melting crucible 12 is low, and the upper part of the molten metal 22a and the furnace bottom 24a are close to each other. In some cases, a sufficient degree of superheat may not be reached due to heat loss.
Moreover, since the molten metal 22a has a thin flat shape, there is a problem that it is extremely difficult to immerse the snout 26 (described later) in the molten metal 22a during casting. H / D
Is set to be larger than 0.5, the upper part of the molten metal 22a and the furnace bottom 24a are sufficiently separated from each other, and it is possible to suppress a decrease in the degree of superheat due to conduction heat loss from the furnace bottom 24a. In addition, since the center height H of the molten metal 22a is defined with respect to the inner diameter D of the melting crucible 12, the molten metal
a can also be prevented from contacting the inner wall surface of the crucible.
【００１５】(第２のレビテーション溶解方法について)
前述した構成の溶解装置１０において実施されるレビテ
ーション溶解方法において、溶解用ルツボ１２内にお
ける溶湯２２ａの中央高さＨの１／２の位置で、溶湯２
２ａの外表面と溶解用ルツボ１２の内壁面との隙間Ｓ
を、３〜１０ｍｍの範囲として操業する。これにより、
溶解用ルツボ１２の内部で溶解された溶湯２２ａがルツ
ボ内壁面に接触することなく安定的に保持されたもと
で、該溶湯２２ａの過熱度を鋳造に適した温度に保つこ
とができる。すなわち、隙間Ｓが小さくなり過ぎると、
溶湯２２ａの揺れによって該溶湯２２ａとルツボ内壁面
とが容易に接触してしまうから、隙間Ｓの最小値を３ｍ
ｍに規定することにより、溶湯２２ａの揺れによるルツ
ボ内壁面との接触を確実に回避して溶湯２２ａの品質が
低下するのを防止し得る。また隙間Ｓが大きくなり過ぎ
ると、溶湯２２ａの上部が細くなって揺れ易くなり、溶
湯２２ａが不安定になると共に、高周波誘導コイル２０
による加熱効率が低下して適正な過熱度を保持できなく
なる。これに対して隙間Ｓの最大値を１０ｍｍに規定す
ることにより、溶湯２２ａの安定化を図ると共に、過熱
度を鋳造に適した温度に保つことが可能となる。(Regarding the second levitation dissolution method)
In the levitation melting method performed in the melting device 10 having the above-described configuration, the molten metal 2 is placed at a position の of the center height H of the molten metal 22 a in the melting crucible 12.
The gap S between the outer surface of 2a and the inner wall surface of the melting crucible 12
Operate in the range of 3 to 10 mm. This allows
While the molten metal 22a melted inside the melting crucible 12 is stably held without contacting the inner wall surface of the crucible, the degree of superheat of the molten metal 22a can be maintained at a temperature suitable for casting. That is, if the gap S becomes too small,
Since the molten metal 22a easily comes into contact with the inner wall of the crucible due to the shaking of the molten metal 22a, the minimum value of the gap S is set to 3 m.
By defining m, it is possible to reliably avoid contact with the inner wall surface of the crucible due to the shaking of the molten metal 22a and prevent the quality of the molten metal 22a from deteriorating. If the gap S becomes too large, the upper part of the molten metal 22a becomes thin and easily shakes, and the molten metal 22a becomes unstable, and the high-frequency induction coil 20
, The heating efficiency is lowered, and the proper degree of superheat cannot be maintained. On the other hand, by setting the maximum value of the gap S to 10 mm, it is possible to stabilize the molten metal 22a and to maintain the degree of superheat at a temperature suitable for casting.
【００１６】(第１の溶解・鋳造方法について)第１の溶
解・鋳造方法においては、前述した第１のレビテーショ
ン溶解方法により溶解した溶湯２２ａを、鋳型(図示せ
ず)に鋳込む際に、例えば鋳型を収納した密閉容器を減
圧状態に保持したもとで、鋳型に連通するスノート２６
の下端を溶解用ルツボ１２の上方から垂下し、その下端
を溶湯２２ａ内に没入させる(図２参照)。これにより、
ルツボ１２内の溶湯２２ａは、ルツボ内壁面に接触する
ことなく清浄なままスノート２６を介して鋳型の内部に
吸込まれる。(First Melting / Casting Method) In the first melting / casting method, when the molten metal 22a melted by the first levitation melting method described above is cast into a mold (not shown). For example, the snout 26 communicating with the mold is maintained while the closed container containing the mold is kept under reduced pressure.
Is suspended from above the melting crucible 12, and the lower end is immersed in the molten metal 22a (see FIG. 2). This allows
The molten metal 22a in the crucible 12 is sucked into the inside of the mold via the snout 26 while keeping clean without contacting the inner wall surface of the crucible.
【００１７】この場合において、以下の条件で鋳込み作
業を行なうことにより、安定かつ効率的な操業が達成さ
れ、しかも鋳物精度が向上する。 溶湯２２ａに没入したスノート２６の下端高さＨ
1を、前記溶解用ルツボ１２の炉底部２４ａより５ｍｍ
以上高い位置とする。 溶湯２２ａ内へのスノート２６の没入長さＨ2を、１
０ｍｍ以上に保つ。 スノート２６の内径ｄと、溶解用ルツボ２６の内径
Ｄとを、ｄ／Ｄ≦０.５の関係とする。In this case, by performing the casting operation under the following conditions, a stable and efficient operation is achieved, and the casting accuracy is improved. Lower end height H of snout 26 immersed in molten metal 22a
1 is 5 mm from the furnace bottom 24 a of the melting crucible 12.
Above. The immersion length H 2 of the snout 26 in the molten metal 22a is 1
Keep it at 0 mm or more. The inner diameter d of the snout 26 and the inner diameter D of the melting crucible 26 have a relationship of d / D ≦ 0.5.
【００１８】前記の条件を満すことにより、スノート
２６の下端が、溶解用ルツボ２６の炉底部２４ａに接触
して、該スノート２６や炉底部２４ａを損傷させること
なく良好な吸込みを行ない得る。また、の条件を満す
ことにより、スノート２６で溶湯２２ａを吸込むことに
よって溶湯２２ａの貯留レベルが低下して該スノート２
６の下端が溶湯２２ａ内から外部に出てしまうのを防
ぎ、これによりガスを吸込んで鋳物製品に欠陥を生ずる
のを有効に防止し得る。更に、の条件を満すことによ
り、上面が半球状で立ち上がり保持されている溶湯２２
ａに対し、スノート２６の内径が小さいから、該スノー
ト２６の位置ずれ等による径方向の変位によっても溶湯
２２ａ内からスノート下端が外部に出るのを抑制するこ
とができ、ガスの吸込みを防止し得るものである。By satisfying the above conditions, the lower end of the snout 26 comes into contact with the furnace bottom 24a of the melting crucible 26, and good suction can be performed without damaging the snout 26 and the furnace bottom 24a. In addition, when the condition (2) is satisfied, the storage level of the molten metal 22a is reduced by sucking the molten metal 22a with the snout 26, and
It is possible to prevent the lower end of 6 from going out of the molten metal 22a to the outside, thereby effectively preventing gas from being sucked and causing defects in the cast product. Further, by satisfying the condition (2), the molten metal 22 whose upper surface is raised and held in a hemispherical shape is held.
Since the inner diameter of the snout 26 is smaller than that of a, the lower end of the snout can be prevented from going out of the molten metal 22a due to radial displacement due to displacement or the like of the snout 26, thereby preventing gas from being sucked. What you get.
【００１９】(第２の溶解・鋳造方法について) 第２の溶解・鋳造方法においては、前述した第２のレビ
テーション溶解方法により溶解した溶湯２２ａを、溶解
用ルツボ１２の上方から垂下してその下端を溶湯２２ａ
内に没入させたスノート２６を介して鋳型に注湯する。
この場合においても、前述した,,の各条件を満す
ことにより、ルツボ１２内の溶湯２２ａを清浄なままの
状態で鋳型に鋳込むことができ、安定した鋳込み作業を
行ない得ると共に、鋳物精度を向上させることができ
る。(Regarding the Second Melting / Casting Method) In the second melting / casting method, the molten metal 22a melted by the above-described second levitation melting method is dripped from above the melting crucible 12 to be melted. Lower end is molten metal 22a
The molten metal is poured through the snout 26 immersed in the mold.
Also in this case, by satisfying the above-mentioned conditions, the molten metal 22a in the crucible 12 can be cast into the mold in a clean state, and a stable casting operation can be performed, and the casting accuracy can be improved. Can be improved.
【００２０】なお第１および第２の溶解・鋳造方法にお
いて、溶解用ルツボ１２内の溶湯２２ａをスノート２６
を介して鋳型に鋳込む方法としては、実施例に説明した
減圧吸引鋳造法(ＣＬＡ)の他に、真空減圧鋳造法(ＣＬ
Ｖ)を使用したり、鋳型内の圧力(減圧または真空)に対
し、ルツボ１２内に不活性ガス等を吹込んで溶湯２２ａ
を加圧してスノート２６内に押し上げることにより鋳込
みを行なう方法を採用することも可能である。In the first and second melting and casting methods, the molten metal 22a in the melting crucible 12
In addition to the vacuum suction casting method (CLA) described in the embodiment,
V) or by blowing an inert gas or the like into the crucible 12 against the pressure (decompression or vacuum) in the mold,
It is also possible to adopt a method of performing casting by pressurizing and pushing up into the snout 26.
【００２１】(実験例について)前述した〜の条件を
満す実施例１〜実施例５および何れかの条件を満してい
ない比較例１〜比較例３につき、実験を行なった結果を
表１に示す。(Experimental Examples) Table 1 shows the results of experiments conducted on Examples 1 to 5 satisfying the above-mentioned conditions and Comparative Examples 1 to 3 not satisfying any of the conditions. Shown in
【００２２】[0022]
【表１】 [Table 1]
【００２３】表１に示す実験結果から、前記〜の全
ての条件を満している場合は、過熱度の安定性、溶湯２
２ａのルツボ内壁面に対する接触の有無、および鋳型へ
のガス吸込みの有無の評価は、何れも特に良好または良
好であった。これに対して、何れかの条件を満していな
い場合は、過熱度の安定性、溶湯の接触の有無、および
ガス吸込みの有無の評価は、不十分または不良等を含む
ものであった。From the experimental results shown in Table 1, when all of the above conditions are satisfied, the stability of the degree of superheat and the melt 2
The evaluation of the presence / absence of contact with the inner wall surface of the crucible and the presence / absence of gas suction into the mold were all particularly good or good. On the other hand, when any of the conditions was not satisfied, the evaluation of the stability of the superheat degree, the presence / absence of the contact with the molten metal, and the presence / absence of the gas suction included inadequate or poor results.
【００２４】[0024]
【発明の効果】以上説明した如く、本発明に係る溶解・
鋳造方法によれば、溶解用ルツボ内での溶湯を、ルツボ
内壁面に接触させることなく安定的に立ち上げ保持した
もとで、該溶湯の過熱度を鋳造に適した温度に保持する
ことができる。また溶解用ルツボ内で溶湯を適正に保持
したもとで、該溶湯を清浄なまま鋳型に安定的に鋳込む
ことができ、効率的な操業を達成した生産効率を向上し
得る。すなわち、汚染のない溶湯を鋳造に適した過熱度
に保持した状態で鋳型に鋳込むことができるから、湯回
り不良に起因して製品に欠陥が発生したり、鋳型を損傷
させることなく効率的な操業を達成し得るものである。As it has been described above, according to the present invention, the engagement Ru dissolve, in the present invention
According to the casting method, the superheat degree of the molten metal in the melting crucible can be maintained at a temperature suitable for casting while the molten metal in the melting crucible is stably raised and held without contacting the inner wall surface of the crucible. it can. In addition, while keeping the molten metal in the melting crucible properly, the molten metal can be stably cast in a mold while keeping the molten metal clean, and the production efficiency can be improved by achieving efficient operation. In other words, since the molten metal without contamination can be cast into the mold while maintaining the superheat suitable for casting, it is efficient without causing defects in the product due to poor running of the melt or damaging the mold. Operation can be achieved.
【図１】本発明に係る溶解・鋳造方法を好適に実施し得
る溶解装置の概略構成図である。FIG. 1 is a schematic configuration diagram of a melting apparatus capable of suitably performing a melting and casting method according to the present invention.
【図２】本発明に係る溶解・鋳造方法の説明図である。FIG. 2 is an explanatory view of a melting / casting method according to the present invention.
１２ 溶解用ルツボ ２０ 高周波誘導コイル ２２ 材料 ２２ａ 溶湯 ２４ａ 炉底部 Ｈ 溶湯の中央高さ Ｈ1 スノートの下端高さ Ｈ2 スノートの没入長さ Ｄ 溶解用ルツボの内径 ｄ スノートの内径 Ｓ 溶湯外表面と溶解用ルツボ内壁面との隙間12 and dissolved crucible 20 high frequency induction coil 22 material 22a melt 24a furnace bottom H center height H 1 snout lower the height H 2 snout immersive length D dissolved crucible inside diameter d snout inner diameter S molten outer surface of the molten metal Clearance between inner wall of melting crucible
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−153561（ＪＰ，Ａ) 特開 平３−216264（ＪＰ，Ａ) 特開 平５−164470（ＪＰ，Ａ) 特公 昭40−17121（ＪＰ，Ｂ１) 日本鋳物協会編「改訂４版 鋳造便 覧」（昭和61年１月20日）丸善 Ｐ. 1050 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-153561 (JP, A) JP-A-3-216264 (JP, A) JP-A-5-164470 (JP, A) 17121 (JP, B1) Casting Handbook, Revised 4th Edition, edited by the Japan Foundry Association (January 20, 1986) Maruzen P. 1050
Claims (3)
波誘導コイル(20)に高周波電流を流すことにより、前記
溶解用ルツボ(12)内に装入した材料(22)を誘導加熱し、
その底部を凝固状態に保ちつつ溶解した溶湯(22a)を溶
解用ルツボ(12)の内壁面に対して非接触状態で立ち上
げ、この溶湯(22a)を鋳型に鋳込む溶解・鋳造方法におい
て、 前記溶解用ルツボ(12)内における溶湯(22a)中央の高さ
Ｈ(mm)と、溶解用ルツボ(12)の内径Ｄ(mm)との関係が、
Ｈ／Ｄ＞０.５となる状態で溶解を行ない、 前記溶解用ルツボ(12)の上方からスノート(26)を垂下
し、その下端を溶湯(22a)に没入させて、該スノート(2
6)の下端の高さＨ 1 (mm)を、溶解用ルツボ(12)の内底部
(24a)より５mm以上高い位置とすると共に、該スノート
(26)の没入長さＨ 2 (mm)を、１０mm以上に保った状態
で、該スノート(26)を介して溶湯(22a)を鋳型内へ注湯
することを特徴とする溶解・鋳造方法。A material (22) charged in the melting crucible (12) is induction-heated by flowing a high-frequency current through a high-frequency induction coil (20) wound around the melting crucible (12). And
In a melting / casting method in which the molten metal (22a) melted while keeping its bottom in a solidified state is raised in a non-contact state with respect to the inner wall surface of the melting crucible (12), and the molten metal (22a) is cast into a mold, The relationship between the height H (mm) of the center of the molten metal (22a) in the melting crucible (12) and the inner diameter D (mm) of the melting crucible (12) is as follows:
H / D> performs dissolved state of 0.5 to droop the snout (26) from above the melting crucible (12), and immerses the lower end to the melt (22a), the snout (2
6) Lower the height H 1 (mm ) of the lower end to the inner bottom of the melting crucible (12).
(24a) and at least 5 mm higher than
With the immersion length H 2 (mm) of (26) kept at 10 mm or more
In, melting and casting method, characterized by pouring into the mold the molten metal (22a) through the snout (26).
波誘導コイル(20)に高周波電流を流すことにより、前記
溶解用ルツボ(12)内に装入した材料(22)を誘導加熱し、
その底部を凝固状態に保ちつつ溶解した溶湯(22a)を溶
解用ルツボ(12)の内壁面に対して非接触状態で立ち上
げ、この溶湯(22a)を鋳型に鋳込む溶解・鋳造方法におい
て、 前記溶解用ルツボ(12)内における溶湯(22a)中央の高さ
Ｈ(mm)の１／２の位置での溶湯(22a)の外表面と、溶解
用ルツボ(12)の内壁面との隙間Ｓ(mm)を３〜１０mmの範
囲で溶解を行ない、 前記溶解用ルツボ(12)の上方からスノート(26)を垂下
し、その下端を溶湯(22a)に没入させて、該スノート(2
6)の下端の高さＨ 1 (mm)を、溶解用ルツボ(12)の内底部
(24a)より５mm以上高い位置とすると共に、該スノート
(26)の没入長さＨ 2 (mm)を、１０mm以上に保った状態
で、該スノート(26)を介して溶湯(22a)を鋳型内へ注湯
することを特徴とする溶解・鋳造方法。2. A high-frequency current is passed through a high-frequency induction coil (20) wound around the melting crucible (12) to heat the material (22) charged in the melting crucible (12). And
In a melting / casting method in which the molten metal (22a) melted while keeping its bottom in a solidified state is raised in a non-contact state with respect to the inner wall surface of the melting crucible (12), and the molten metal (22a) is cast into a mold, A gap between the outer surface of the molten metal (22a) at a position 1/2 the height H (mm) at the center of the molten metal (22a) in the melting crucible (12) and the inner wall surface of the melting crucible (12) performs dissolving S (mm) of a range of 3 to 10 mm, suspended the snout (26) from above the melting crucible (12), and immerses the lower end to the melt (22a), the snout (2
6) Lower the height H 1 (mm ) of the lower end to the inner bottom of the melting crucible (12).
(24a) and at least 5 mm higher than
With the immersion length H 2 (mm) of (26) kept at 10 mm or more
In, melting and casting method, characterized by pouring into the mold the molten metal (22a) through the snout (26).
の内径ｄ(mm)を、前記溶解用ルツボ(12)の内径Ｄ(mm)の
１／２以下とした請求項１または２記載の溶解・鋳造方
法。3. A snout (26) immersed in the molten metal (22a).
The melting / casting method according to claim 1 or 2 , wherein the inner diameter d (mm) of the smelting crucible (12) is 1/2 or less of the inner diameter D (mm) of the melting crucible (12).
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7188205A JP3044598B2 (en) | 1995-06-29 | 1995-06-29 | Melting / casting method |
| TW085104417A TW297050B (en) | 1995-05-19 | 1996-04-13 | |
| US08/641,972 US5837055A (en) | 1995-05-19 | 1996-05-01 | Levitation melting method and melting and casting method |
| DE69617103T DE69617103T2 (en) | 1995-05-19 | 1996-05-03 | Suspended melting process and melting and casting process |
| EP96106965A EP0747648B1 (en) | 1995-05-19 | 1996-05-03 | Levitation melting method and melting and casting method |
| KR1019960016122A KR100371957B1 (en) | 1995-05-19 | 1996-05-15 | Levitation melting method and melting and casting method |
| RU96109196A RU2128235C1 (en) | 1995-05-19 | 1996-05-17 | Process of flush smelting, its variants and process of flush smelting and casting, its variants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7188205A JP3044598B2 (en) | 1995-06-29 | 1995-06-29 | Melting / casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0914852A JPH0914852A (en) | 1997-01-17 |
| JP3044598B2 true JP3044598B2 (en) | 2000-05-22 |
Family
ID=16219618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7188205A Expired - Fee Related JP3044598B2 (en) | 1995-05-19 | 1995-06-29 | Melting / casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3044598B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05164470A (en) * | 1991-12-12 | 1993-06-29 | Kitashiba Denki Kk | Liningless inductive melting furnace |
| JP3099612B2 (en) * | 1993-11-12 | 2000-10-16 | 富士電機株式会社 | Suspension dissolution equipment |
-
1995
- 1995-06-29 JP JP7188205A patent/JP3044598B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 日本鋳物協会編「改訂４版 鋳造便覧」（昭和６１年１月２０日）丸善 Ｐ．１０５０ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0914852A (en) | 1997-01-17 |
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