JPH01249240A - Manufacture of hollow billet - Google Patents
Manufacture of hollow billetInfo
- Publication number
- JPH01249240A JPH01249240A JP7568688A JP7568688A JPH01249240A JP H01249240 A JPH01249240 A JP H01249240A JP 7568688 A JP7568688 A JP 7568688A JP 7568688 A JP7568688 A JP 7568688A JP H01249240 A JPH01249240 A JP H01249240A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- core
- molten metal
- tip
- hollow
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 49
- 239000002184 metal Substances 0.000 claims abstract description 49
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000010439 graphite Substances 0.000 claims abstract description 18
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 18
- 239000011261 inert gas Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000009749 continuous casting Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 26
- 238000007711 solidification Methods 0.000 claims description 11
- 230000008023 solidification Effects 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 claims description 10
- 230000001050 lubricating effect Effects 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 26
- 239000007789 gas Substances 0.000 abstract description 18
- 230000006866 deterioration Effects 0.000 abstract description 4
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 3
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- -1 ferrous metals Chemical class 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000006263 metalation reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は非鉄金属特に種々の合金組成のアルミニウム溶
湯を上部耐火物の溶湯保持部の一方向より水平に供給し
ビレットを製造する縦型半連続鋳造方法（ホットトップ
鋳造方式）の改良に関するもので、中空ビレットを安全
に製造する方法を提供するものである。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a vertical semi-finishing device for producing billets by horizontally supplying molten metal of non-ferrous metals, particularly aluminum of various alloy compositions, from one direction of the molten metal holding part of the upper refractory. This invention relates to improvements in the continuous casting method (hot top casting method) and provides a method for safely manufacturing hollow billets.
従来非鉄金属、例えばアルミニウムおよびアルミニウム
合金などのビレットの鋳造方式としてはホントトップ鋳
造方式およびダイレクトチルキャスティング方式がある
。ホットトップ鋳造方式は特公昭５４−４２８４７号な
どで知られているが、このホットトップ鋳造方式は、上
部耐火物付近に多量の溶湯を保持し、下部の水冷鋳型に
より凝固させてビレットとするものである。Conventional methods for casting billets of non-ferrous metals, such as aluminum and aluminum alloys, include a true top casting method and a direct chill casting method. The hot top casting method is known from Japanese Patent Publication No. 54-42847, etc., and this hot top casting method holds a large amount of molten metal near the upper refractory and solidifies it into a billet in a water-cooled mold at the bottom. It is.
この方式は内部欠陥のない高品質のビレットを製造する
方法としては主に押出用ビレットの製造に用いられてい
るが、その形状は中実ビレットに限られている。This method is mainly used to produce billets for extrusion as a method for producing high-quality billets without internal defects, but its shape is limited to solid billets.
押出用ビレットは、マンドレル押出による管の製造では
、中空ビレットを使用した方が歩留りなどの点で存利で
あることから中空ビレットの製造方法の確立が強く要求
されている。上記のホットトップ鋳造方式により中空ビ
レ７トを製造する試みも行なわれているが、この方式に
おいては上部耐火物付近に多量の溶湯が保持されている
ことが特徴であり、ビレットの凝固過程では中空部分に
凝固収縮が生じ中子鋳型は常にビレットに引込まれる力
が加わり、冷却水の上から多量の溶湯が覆い被さり水蒸
気爆発を起こすおそれがあり、実用化はされていない。As for billets for extrusion, there is a strong demand for the establishment of a method for producing hollow billets because it is more advantageous in terms of yield when producing pipes by mandrel extrusion. Attempts have been made to manufacture hollow billets using the hot top casting method described above, but this method is characterized by the fact that a large amount of molten metal is retained near the upper refractory, and the solidification process of the billet is Solidification shrinkage occurs in the hollow part, and the core mold is constantly drawn into the billet, and a large amount of molten metal covers the cooling water, potentially causing a steam explosion, so it has not been put to practical use.
一方ダイレクトチルキャスティング方式により中空ビレ
ット製造の試みもなされているが、この方式の場合溶湯
面レベル調節のための可動部分のフローティングデイス
トリビューターやスパウトなどによりアルミニウム溶湯
の乱流が引起こされ、不可避的に発生する酸化物が中空
ビレット中に混入し品質が低下するおそれがあった。On the other hand, attempts have been made to manufacture hollow billets using the direct chill casting method, but in this method, turbulent flow of the aluminum molten metal is inevitably caused by floating distributors and spouts, which are movable parts for adjusting the molten metal level. There was a risk that the oxides generated during the billet would be mixed into the hollow billet and the quality would deteriorate.
そこで本発明者等は上記の問題について種々検討の結果
、先に特願昭６２−１０７７４９号において「中空ビレ
ットの製造方法および装置」を開発した。As a result of various studies regarding the above-mentioned problems, the inventors of the present invention previously developed a ``Method and Apparatus for Manufacturing Hollow Billets'' in Japanese Patent Application No. 107749/1982.
この方法および装置の特徴は、鋳型の中心に中子鋳型を
配置し、この中子鋳型の先端を溶湯が鋳型外周部からの
冷却水などによる熱抽出により進行する凝固先端部より
充分に長くして中子先端を拘束することにより中空部を
形成させ中空ビレットを製造するものであり、この方法
によれば安全に、しかも内部欠陥のない高品質の中空ビ
レットが得られる。The feature of this method and device is that a core mold is placed in the center of the mold, and the tip of the core mold is made sufficiently longer than the tip of the core mold where the molten metal solidifies due to heat extraction by cooling water from the outer periphery of the mold. A hollow billet is manufactured by forming a hollow part by restraining the tip of the core using the method, and by this method, a high-quality hollow billet with no internal defects can be obtained safely.
しかし、上記の中子鋳型として黒鉛をその下部または全
部に使用した中子鋳型の場合においては、使用を重ねる
につれて黒鉛表面が熱消耗して浸蝕劣化する。劣化した
黒鉛部では中空部との摩擦が増大して平滑な内面が得ら
れず、また最終的には場漏れなどのトラブルに発展する
おそれがあるこ本発明は上記の問題について検討の結果
、特に黒鉛の中子鋳型を使用した場合においても中空ビ
レットを安全に、しかも内部欠陥のない高品質の中空ビ
レ・ントを安定して製造できる方法を開発したものであ
る。However, in the case of a core mold in which graphite is used for the lower part or the entire part of the core mold, as the core mold is used repeatedly, the graphite surface is thermally consumed and deteriorates due to erosion. In a deteriorated graphite part, friction with the hollow part increases, making it impossible to obtain a smooth inner surface, and ultimately leading to troubles such as field leakage.The present invention was developed as a result of studying the above problems, and in particular, We have developed a method that can safely and stably produce high-quality hollow billets with no internal defects even when graphite core molds are used.
〔課題を解決するための手段および作用〕本発明は上記
の問題に鑑みなされたもので上部に耐火物の断熱部分を
持ち、下部に水冷部分とその中間部に潤滑界面を形成さ
せるための潤滑油供給口を組合せた組鋳型により、溶湯
を上部耐火物の溶湯保持部の一方向より水平に供給して
冷却する縦型半連続鋳造方法において、鋳型の中心に下
部または全部が黒鉛製の中子鋳型に配置し、該中子鋳型
の先端を、溶湯が鋳型外周部からの冷却水などによる熱
抽出により進行する凝固先端部より充分に長くして、中
子先端により内径の凝固先端を拘束すると共に中子鋳型
の貫通孔より不活性ガスを供給し、中子鋳型の先端部と
中空部に不活性ガスを充填しながら中空部を形成するこ
とを特徴とする中空ビレットの製造方法である。[Means and effects for solving the problems] The present invention was made in view of the above problems, and has a refractory heat-insulating part in the upper part, a water-cooled part in the lower part, and a lubricating part to form a lubricating interface in the middle part. In the vertical semi-continuous casting method, in which the molten metal is supplied horizontally from one direction to the molten metal holding part of the upper refractory using an assembled mold combined with an oil supply port and cooled, a lower part or the entire graphite inner part is placed in the center of the mold. Placed in a child mold, the tip of the core mold is made sufficiently longer than the tip of the solidification where the molten metal progresses due to heat extraction by cooling water from the outer periphery of the mold, and the solidification tip of the inner diameter is restrained by the tip of the core. At the same time, an inert gas is supplied through the through hole of the core mold, and the hollow part is formed while filling the tip part and the hollow part of the core mold with the inert gas. .
以下に本発明を図面を用いて説明する。The present invention will be explained below using the drawings.
第１図においてアルミニウム合金溶湯（１）は図示しな
い溶解保持炉、溶湯フィルターラインを経由して鋳造ト
ラフ（２）に導かれる。鋳造トラフは鋳型上部耐火物（
３）の溶湯保持部（４）に直接に接続され、溶湯はフロ
ティングデイストリビューターやスパウトなどの場面レ
ベル調節のための可動部分なしに、直接に上部耐火物の
溶湯保持部流入口（５）より水平に供給される。上部耐
火物に供給された溶湯は凝固の進行とともに逐次下降し
、断熱部下部の水冷金属部分（６）に接触することによ
り外側より凝固殻（７）の形成が開始され、それを厚化
しつつ水冷金属下端に引出され、更に冷却水（８）の直
接冷却によって凝固が進行する。凝固開始点は常に耐火
物の溶湯保持部の下部であるために、上部耐火物（３）
と水冷金属部分（６）の間には潤滑界面を形成させるた
めの潤滑供給口（９）が必要とされる。中空部分を形成
するための中子鋳型００は、サポートパー０２）により
鋳型の中央部に位置するように上部耐火物（３）に固定
されるが、外側よりの直接冷却により進行する凝固先端
より充分に長い中子鋳型の存在により、中央部の凝固殻
は拘束されて中空部分０■が形成される。本発明におい
て使用される中子鋳型の形状は下方が小径となるような
テーパーを持つもので材質としては、マリナイト（商品
名ニジジーンズマンビル社製）、ルミボード−Ｌ（商品
名：ニチアス社製）、レセバル（商品名：朝日石綿社製
）などのような耐火物或いは黒鉛、窒化ケイ素などが使
用できる。中子鋳型の構造は第１図に示すように黒鉛の
一体構造としてもよく、また第２図に示すように上部に
上記材質の耐火物中子０ω、下部に黒鉛中子ＧＯを用い
る二重構造としてもよい。In FIG. 1, molten aluminum alloy (1) is led to a casting trough (2) via a melting and holding furnace (not shown) and a molten metal filter line. The casting trough is connected to the mold upper refractory (
The molten metal is directly connected to the molten metal holding part (4) of the upper refractory (5), and the molten metal is directly connected to the molten metal holding part (4) of the upper refractory, without moving parts such as floating distributors or spouts for scene level adjustment. ) is fed more horizontally. The molten metal supplied to the upper refractory gradually descends as solidification progresses, and when it comes into contact with the water-cooled metal part (6) at the bottom of the insulation part, the formation of a solidified shell (7) starts from the outside, and it thickens. It is drawn out to the lower end of the water-cooled metal, and solidification proceeds by direct cooling of the cooling water (8). Since the starting point of solidification is always at the bottom of the molten metal holding part of the refractory, the upper refractory (3)
A lubrication supply port (9) is required between the water-cooled metal part (6) and the water-cooled metal part (6) to form a lubrication interface. The core mold 00 for forming the hollow part is fixed to the upper refractory (3) by the support par 02) so as to be located in the center of the mold. Due to the presence of a sufficiently long core mold, the solidified shell in the center is restrained and a hollow portion 0 is formed. The shape of the core mold used in the present invention is tapered so that the diameter is smaller at the bottom, and the materials are Marinite (product name: manufactured by Niji Jeans Manville Co., Ltd.), Lumibord-L (product name: manufactured by Nichias Co., Ltd.). ), refractories such as Resebal (trade name: manufactured by Asahi Asbestos Co., Ltd.), graphite, silicon nitride, etc. can be used. The structure of the core mold may be a monolithic structure made of graphite as shown in Fig. 1, or a double structure as shown in Fig. 2 with a refractory core 0ω of the above material in the upper part and a graphite core GO in the lower part. It may also be a structure.
本発明の目的とする溶湯レベ調節機構を持たないホット
トップ鋳造方法による中空ビレット製造のためには、上
部に耐火物、下部に黒鉛などを組合せた構造のものの方
が、溶湯レベル変動の影響を受は難く、さらに下部の黒
鉛などの潤滑作用により鋳肌が美麗に製造できる。In order to manufacture hollow billets using the hot-top casting method that does not have a molten metal level adjustment mechanism, which is the object of the present invention, it is better to use a structure that combines a refractory material in the upper part and graphite in the lower part, because it is less affected by fluctuations in the molten metal level. It is difficult to catch, and the lubricating effect of the graphite at the bottom allows for a beautiful casting surface.
上記の黒鉛などは、「むく」のものでなくともよく中空
、或いは外張りとすることにより黒鉛を節約でき経済的
ある地熱容量が小さ（なるためにビレットの内径が均一
に製造できる効果がある。The above-mentioned graphite does not have to be "solid", but by making it hollow or covered, it is economical to save graphite, and the geothermal capacity is small (this has the effect of making the inside diameter of the billet uniform). .
しかして本発明は第１図に示すように中子鋳型全体を黒
鉛とした場合または第２図に示すように上部に耐火物、
下部に黒鉛を使用した場合において、黒鉛表面の熱消耗
を防止するために、熱消耗を起こす黒鉛中子鋳型下部と
中空部近傍に不活性ガスを充填して黒鉛の酸化を防止し
ながら中空ビレット０４１を鋳造する方法である。すな
わち例えば第１図に示すように黒鉛中子鋳型０［Ｉ）の
中心にガス導入管０力を貫通して設け、上方より、Ａｒ
、Ｎχ、ＣＯガスなどの不活性ガス（ＩＩを導入して黒
鉛中子鋳型下部と中空部近傍に充填して黒鉛中子鋳型の
酸化を防ぎ消耗を防止するものである。また第２図に示
すように中子鋳型の耐火物中ＯＩおよびその下部の黒鉛
中子００を貫通してガス導入管０ηを設け、さらにこの
下方に、円板Ｏｇ）を取付けて上方より導入されたガス
が、この円板に突当って四方に流出し黒鉛中子の下部お
よび中空部近傍の酸化防止を一層良好にしたものである
。この他、不活性ガスの導入方法としてはガス導入管の
下部を四方に分けた細管として四方にガスが良好に流出
するようにしてもよく、またガス導入管の下部と黒鉛中
子鋳型の凝固先端部より先の鋳型外周部に通じるガス導
入孔（図示せず）を設けて、ここからガスを流出するよ
うにしてもよい、この他種々のガスの導入方法が考えら
れるが、要は中子鋳型の黒鉛部の下部および中空部近傍
に不活性ガスを充填してこの付近の酸化を防止できる方
法であればよい。However, the present invention is applicable when the entire core mold is made of graphite as shown in FIG.
When graphite is used in the lower part, in order to prevent heat consumption of the graphite surface, inert gas is filled in the lower part of the graphite core mold and near the hollow part, which causes heat consumption, to prevent oxidation of the graphite while forming a hollow billet. This is a method of casting 041. That is, for example, as shown in FIG.
Inert gas (II) such as , Nχ, and CO gas is introduced and filled into the lower part of the graphite core mold and near the hollow part to prevent oxidation of the graphite core mold and prevent wear and tear. As shown, a gas introduction pipe 0η is provided passing through the refractory OI of the core mold and the graphite core 00 below it, and a disk Og) is attached below this, so that the gas introduced from above is It collides with this disc and flows out in all directions, further improving the prevention of oxidation in the lower part of the graphite core and near the hollow part. In addition, as an inert gas introduction method, the lower part of the gas introduction pipe may be divided into four thin tubes so that the gas flows out in all directions, and the lower part of the gas introduction pipe and the graphite core mold may be solidified. A gas introduction hole (not shown) leading to the outer periphery of the mold beyond the tip may be provided and the gas may be allowed to flow out from this hole.There are various other gas introduction methods that can be considered, but the main point is to Any method may be used as long as it can fill the lower part of the graphite part of the child mold and the vicinity of the hollow part with an inert gas to prevent oxidation in this area.
なお不活性ガスの流量はビレツの大きさ、ガスの種類な
どによって異なるが外径３００〜５００＋ｍφの場合Ａ
ｒであれば０．３ Ｎ〜３ｆｆｉ／＋ｍｉｎ程度が適当
であるや
本発明は上記のようにして不活性ガスにより酸化を防止
しながら鋳造することにより黒鉛中子鋳型表面の熱消耗
が防止され、黒鉛の浸蝕、劣化が抑制される結果、平滑
な内面を有する中空ビレットが安定して製造できるもの
である。Note that the flow rate of inert gas varies depending on the size of the billet, the type of gas, etc., but if the outer diameter is 300 to 500 + mφ, A
If it is r, then approximately 0.3 N to 3 ffi/+min is appropriate.The present invention prevents thermal consumption of the surface of the graphite core mold by casting while preventing oxidation with an inert gas as described above. As a result of suppressing corrosion and deterioration of graphite, a hollow billet having a smooth inner surface can be stably produced.
さらに本発明においては上記の中子鋳型により中空ビレ
ットの内面を形成した後、中子鋳型の下方に別に水冷装
置を設けてビレット内面を冷却することも可能である。Furthermore, in the present invention, after forming the inner surface of the hollow billet using the core mold, it is also possible to cool the billet inner surface by separately providing a water cooling device below the core mold.
本発明は特別の冷却を行なわない中子鋳型をズンプ（ａ
部先端）より更に長く突き出して外側からの凝固進行に
対して例えば黒鉛部先端により凝固先端を拘束して中空
部分を形成させることを最大の特徴とするもので、中子
鋳型は水冷による冷却を行なわないホロー内側の鋳肌が
平滑で美麗なビレットが製造できる。また万一ホロー内
で湯漏れが発生しても水蒸気爆発は起らず安全上の問題
がない、最終凝固部がホロー内側となるため、凝固収縮
巣やボイドなどの欠陥が発生したとしても内側にのみ発
生するので製品としての価値低下が少ない。さらに上部
耐火物に溶湯を多量に保持することができるのでポット
内溶湯レベルの変動が少ないなど多くのメリットを有す
るものである。The present invention is a method for manufacturing core molds without special cooling.
The main feature is that the tip of the graphite part is protruded longer than the tip of the graphite part to prevent solidification from proceeding from the outside, for example, to form a hollow part by restraining the solidified tip by the tip of the graphite part.The core mold can be cooled by water cooling. It is possible to produce billets with a smooth and beautiful casting surface on the inside of the hollow. In addition, even if a leak occurs in the hollow, a steam explosion will not occur and there will be no safety issues.The final solidification part will be inside the hollow, so even if defects such as solidification shrinkage cavities or voids occur, there will be no steam explosion. Since this occurs only in the following cases, there is little deterioration in the value of the product. Furthermore, since a large amount of molten metal can be held in the upper refractory, there are many advantages such as less fluctuation in the level of molten metal in the pot.
しかして本発明の実施に当って上記の中子鋳型の先端は
溶湯の凝固先端部より３０ｗ以上長くするもので、これ
未満であると湯漏れのおそれがあり、またあまり長いと
経済的に不利である。またビレットの降下速度、冷却水
量、溶湯温度などの鋳造条件もビレットの品質に関係す
るので調整が必要であり、溶湯の種類によって若干異な
るがビレットの降下速度は５０ ｗｍ、／＋＋ｉｎ〜１
２０ ｎｕｓ／ｓｉｎ。However, in implementing the present invention, the tip of the core mold must be at least 30W longer than the solidified tip of the molten metal; if it is less than this, there is a risk of leakage, and if it is too long, it is economically disadvantageous. It is. In addition, casting conditions such as the rate of descent of the billet, amount of cooling water, and temperature of the molten metal must be adjusted as they are related to the quality of the billet.Although it varies slightly depending on the type of molten metal, the rate of descent of the billet is 50 wm, /++in~1
20 nus/sin.
冷却水ｉｆ ５０１！ ／＋ｍｉｎ〜３５０ ｆ ／ｍ
ｉｎ、溶湯温度は６８０℃〜７３０ ’Ｃが適当である
。Cooling water if 501! /+min~350f/m
In, the temperature of the molten metal is suitably 680°C to 730'C.
また本発明の実施に際しては、第３図に示すように、本
発明の鋳造装置を多数配置しておき（図示はＮＩＬＩ〜
１１ｈ４までの４台）湯溜０９を介して樋０ωより溶湯
を上部耐火物の溶湯保持の一方向より供給して同時に多
数本のビレットを鋳造できる。Furthermore, when carrying out the present invention, a large number of casting apparatuses of the present invention are arranged as shown in FIG.
(4 units up to 11h4) Molten metal is supplied from the gutter 0ω via the sump 09 from one direction of the upper refractory holding the molten metal, and a large number of billets can be cast at the same time.
以下に本発明の一実施例について説明する。 An embodiment of the present invention will be described below.
実施例１
本発明例はＪＩＳ３００３合金の外径３５０ｍφ、内径
８０ｍの中空ビレットを製造した場合を示す。Example 1 An example of the present invention shows a case in which a hollow billet of JIS 3003 alloy having an outer diameter of 350 mφ and an inner diameter of 80 m was manufactured.
使用した第１図の装置構成を説明すると、調合金製の内
径３６０ｍｇ、鋳型長さ７５ＩｌｌＩＢで、上端より１
．０１下部に潤滑油供給のためのスリットを持つ外側水
冷鋳型の上部に、溶湯保持のためにマリナイトの断熱部
（３）を積重ねた。この断熱部には、一方向に水平より
の溶湯流人経路（５）を設けである。To explain the equipment configuration used in Fig. 1, the inner diameter of the prepared alloy is 360 mg, the mold length is 75 IllIB, and the mold is 1 inch from the upper end.
．． 01 A heat insulating section (3) of marinite was stacked on top of the outer water-cooled mold having a slit at the bottom for supplying lubricating oil to hold the molten metal. This heat insulating part is provided with a horizontal molten metal flow path (5) in one direction.
中子０ωは黒鉛製の一体構造で、全長４００ｍ、テーパ
ー角度５．５“のものを断熱部の上部よりサポートバー
にて支持、固定した。The core 0ω had a monolithic structure made of graphite, had a total length of 400 m, and a taper angle of 5.5'', and was supported and fixed from the upper part of the heat insulating part with a support bar.
また黒鉛中子鋳型の中心にガス導入管０７）を設けてＡ
ｒガスを導入して黒鉛中子鋳型下部および中空部側近傍
にガスを充填して冷却するようにし、Ａ「を毎分０．８
１の流量で導入し冷却した。In addition, a gas introduction pipe 07) is provided in the center of the graphite core mold.
r gas is introduced to fill the lower part of the graphite core mold and the vicinity of the hollow part side for cooling, and the rate of A' is 0.8 per minute.
It was introduced at a flow rate of 1 and cooled.
鋳造条件は、降下速度８５ ｍ／ｗｉｎ 、冷却水量２
２０１ ／ｓｉｎ 、溶湯温度７１５°Ｃとした。鋳造
長さ５．５ｍとし半連続鋳造を３回（３ドロップ分）繰
返したが、得られたビレットの内面は非常に平滑で、ま
た鋳造後の黒鉛中子表面も目視観察による熱消耗は認め
られず平滑であった。The casting conditions were a descending speed of 85 m/win and a cooling water amount of 2.
201/sin, and the molten metal temperature was 715°C. Semi-continuous casting was repeated three times (for three drops) with a casting length of 5.5 m, but the inner surface of the resulting billet was extremely smooth, and visual observation showed no heat loss on the surface of the graphite core after casting. It was smooth and smooth.
実施例２
本実施例はＪＩＳ５０５２合金を第２図に示される中子
および実施例１と同様の外側水冷鋳型と断熱部を使用し
て、外径４１０ｍ、内径１２ＤＩＩＩＩｍの中空ビレッ
トを製造した場合を示す、鋳造条件は、降下速度８５論
／ ｍ ｉ ｎ、冷却水量２２０１７１ｍＩｎ 、溶湯
温度６８５℃、鋳造長さ５．５ｍとし、ガス導入管より
Ａｒガスを１．２１ ／ｓｉｎの流量で中空部近傍に充
填しながら半連続鋳造を５回（５ドロップ分）繰返した
が、得られたビレットの内面は非常に平滑で湯漏れなど
のトラブルは発生していない。Example 2 This example describes the case where a hollow billet with an outer diameter of 410 m and an inner diameter of 12 DIII m was manufactured using JIS5052 alloy using the core shown in Fig. 2 and the same outer water-cooled mold and heat insulation part as in Example 1. The casting conditions shown are as follows: descent rate of 85 min/min, cooling water amount of 220,171 ml, molten metal temperature of 685°C, casting length of 5.5 m, and Ar gas flowing from the gas introduction pipe at a flow rate of 1.21 min/sin near the hollow part. Semi-continuous casting was repeated 5 times (5 drops) while filling the billet, but the inner surface of the resulting billet was extremely smooth and no problems such as leakage occurred.
〔発明の効果］
本発明によれば、溶湯レベル調節のための可動部分がな
く、水平に溶湯を供給するホットトップ鋳造法により、
中空ビレットを安全にしかも内面が平滑で内部欠陥のな
い高品質の中空ビレットを安定して製造できると共に黒
鉛中子鋳造の寿命が向上するなど工業上極めて顕著な効
果を発揮するものである。[Effects of the Invention] According to the present invention, there is no movable part for adjusting the molten metal level, and the hot top casting method that supplies molten metal horizontally allows
It is possible to safely produce hollow billets of high quality with a smooth inner surface and no internal defects, and has extremely significant industrial effects such as improving the life of graphite core casting.
第１図および第２図は本発明に係る製造方法の一興体例
を示す縦断面図、第３図は本発明の製造例を示す模式図
である。
１・・・溶湯、 ２・・・鋳造トラフ、 ３・・・鋳型
上部耐火物、 ４・・・溶湯保持部、 ５・・・溶湯流
入口、６・・・水冷金属部分、 ７・・・外側からの凝
固殻の形成開始点、 ８・・・冷却水、 ｌＯ・・・
中子鋳型（！ｉＡ鉛中子）、 １１・・・黒鉛中子、
１４・・・中空ビレット、 １７・・・ガス導入
管、 １８・・・ガス。1 and 2 are vertical cross-sectional views showing an example of the manufacturing method according to the present invention, and FIG. 3 is a schematic diagram showing an example of the manufacturing method of the present invention. DESCRIPTION OF SYMBOLS 1... Molten metal, 2... Casting trough, 3... Mold upper refractory, 4... Molten metal holding part, 5... Molten metal inlet, 6... Water-cooled metal part, 7... Starting point of solidified shell formation from the outside, 8...Cooling water, lO...
Core mold (!iA lead core), 11... graphite core,
14...Hollow billet, 17...Gas introduction pipe, 18...Gas.
Claims (1)
中間部に潤滑界面を形成させるための潤滑油供給口を組
合わせた鋳型により、溶湯を上部耐火物の溶湯保持部の
一方向より水平に供給して冷却する縦型半連続鋳造方法
において、鋳型の中心に下部または全部が黒鉛製の中子
鋳型を配置し、該中子鋳型の先端を、溶湯が鋳型外周部
からの冷却水などによる熱抽出により進行する凝固先端
部より充分に長くして、中子先端により内径の凝固先端
を拘束すると共に中子鋳型の貫通孔により不活性ガスを
供給し、中子鋳型の先端部と中空部に不活性ガスを充填
しながら中空部を形成することを特徴とする中空ビレッ
トの製造方法。The mold has an insulated refractory part on the top, a water-cooled part on the bottom, and a lubricating oil supply port to form a lubricating interface in the middle, allowing the molten metal to flow from one direction into the molten metal holding part of the upper refractory. In a vertical semi-continuous casting method in which cooling is performed by supplying water horizontally, a core mold whose lower part or the entire part is made of graphite is placed in the center of the mold, and the tip of the core mold is cooled by cooling water from the outer periphery of the mold. The solidification tip of the inner diameter is restrained by the core tip, and an inert gas is supplied through the through hole of the core mold. A method for producing a hollow billet, comprising forming a hollow part while filling the hollow part with an inert gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7568688A JPH01249240A (en) | 1988-03-29 | 1988-03-29 | Manufacture of hollow billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7568688A JPH01249240A (en) | 1988-03-29 | 1988-03-29 | Manufacture of hollow billet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01249240A true JPH01249240A (en) | 1989-10-04 |
Family
ID=13583325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7568688A Pending JPH01249240A (en) | 1988-03-29 | 1988-03-29 | Manufacture of hollow billet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01249240A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101983797A (en) * | 2010-10-26 | 2011-03-09 | 西峡龙成特种材料有限公司 | Annular clean metal casting mold |
| JP2013252553A (en) * | 2012-06-08 | 2013-12-19 | Nippon Steel & Sumitomo Metal Corp | Method for continuous casting of hollow cast billet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52111825A (en) * | 1976-03-18 | 1977-09-19 | Nippon Steel Corp | Combined mould for continuous casting |
| JPS57109546A (en) * | 1980-12-26 | 1982-07-08 | Mitsubishi Keikinzoku Kogyo Kk | Casting method for hollow billet |
| JPS6056448A (en) * | 1983-09-06 | 1985-04-02 | Kawasaki Steel Corp | Continuous casting device for metallic pipe |
-
1988
- 1988-03-29 JP JP7568688A patent/JPH01249240A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52111825A (en) * | 1976-03-18 | 1977-09-19 | Nippon Steel Corp | Combined mould for continuous casting |
| JPS57109546A (en) * | 1980-12-26 | 1982-07-08 | Mitsubishi Keikinzoku Kogyo Kk | Casting method for hollow billet |
| JPS6056448A (en) * | 1983-09-06 | 1985-04-02 | Kawasaki Steel Corp | Continuous casting device for metallic pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101983797A (en) * | 2010-10-26 | 2011-03-09 | 西峡龙成特种材料有限公司 | Annular clean metal casting mold |
| JP2013252553A (en) * | 2012-06-08 | 2013-12-19 | Nippon Steel & Sumitomo Metal Corp | Method for continuous casting of hollow cast billet |
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