JP2707283B2 - Metal continuous casting method - Google Patents
Metal continuous casting methodInfo
- Publication number
- JP2707283B2 JP2707283B2 JP21784888A JP21784888A JP2707283B2 JP 2707283 B2 JP2707283 B2 JP 2707283B2 JP 21784888 A JP21784888 A JP 21784888A JP 21784888 A JP21784888 A JP 21784888A JP 2707283 B2 JP2707283 B2 JP 2707283B2
- Authority
- JP
- Japan
- Prior art keywords
- casting
- gas
- mold
- molten metal
- casting method
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/07—Lubricating the moulds
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は金属の連続鋳造法に関するものであり、更に
詳しくは、非鉄金属、特にアルミニウム−リチウム合金
のような特別に活性な合金を除いたアルミニウムもしく
はアルミニウム合金において、気体圧を印加して実施す
る竪型式ホットトップ鋳造法及び水平式連続鋳造法など
の改良された鋳造方法に関する。Description: FIELD OF THE INVENTION The present invention relates to the continuous casting of metals, and more particularly, to the elimination of non-ferrous metals, especially specially active alloys such as aluminum-lithium alloys. The present invention relates to an improved casting method, such as a vertical hot-top casting method and a horizontal continuous casting method, which are performed by applying gas pressure to aluminum or an aluminum alloy.
［従来の技術］ 金属の改善された連続鋳造方法として、特公昭54-428
47号にて開示されている気体加圧による竪型式ホットト
ップ鋳造方法、あるいは特公昭61-47622号に開示され
た、通気性を具備した黒鉛リングから気体と潤滑油をモ
ールド内の金属溶湯面に供給して、鋳造を行なう直接チ
ル鋳造法がある。[Prior art] Japanese Patent Publication No. 54-428 is an improved continuous casting method for metal.
The vertical hot-top casting method by gas pressure disclosed in No. 47, or the gas and lubricating oil from the graphite ring having air permeability disclosed in Japanese Patent Publication No. 61-47622, the molten metal surface in the mold There is a direct chill casting method in which the chill is supplied to the casting.
また、特開昭61-71157号においては、モールド内にお
ける溶湯の冷却のアンバランス及びモールド内壁の潤滑
界面の不均一性を解消して鋳塊組織の均質化、鋳肌欠陥
やブレークアウトを排除して良品質の鋳塊を安定して鋳
造する方法として、強制冷却され、水平に置かれた筒状
モールドの上流端に、金属溶湯流入口を開口した耐火物
製板体を挟んでタンディッシュの金属溶湯出口を接続
し、該耐火物製板体が該筒状モールドの内周面より内側
に張り出して隅部を形成し、前記タンディッシュから流
入させた金属溶湯を前記筒状モールド内において柱状ま
たは中空状に保持して凝固させる工程を含む金属の水平
連続鋳造において、前記筒状モールドの軸芯より下方の
前記隅部に気体を導入して気体圧を印加した空間を形成
せしめ、金属溶湯と前記筒状モールド内周面との水平方
向の接触位置を下流端側に偏移せしめて冷却量を制限す
ることからなる水平連続鋳造法が開示されている。In Japanese Patent Application Laid-Open No. 61-71157, the unbalance of the cooling of the molten metal in the mold and the non-uniformity of the lubrication interface on the inner wall of the mold are eliminated to homogenize the ingot structure and eliminate casting surface defects and breakouts. As a method to stably cast good quality ingots, a tundish is sandwiched between the upstream end of a cylindrical mold that has been forcibly cooled and placed horizontally, The refractory plate body extends inward from the inner peripheral surface of the cylindrical mold to form a corner, and the molten metal flowed in from the tundish is passed through the cylindrical mold in the cylindrical mold. In horizontal continuous casting of metal including a step of solidifying by holding in a columnar or hollow shape, a gas is introduced into the corner below the axis of the cylindrical mold to form a space in which gas pressure is applied, and the metal is formed. The melt and the said Horizontal continuous casting which comprises a horizontal contact position between Jo mold inner circumferential surface brought into shift to the downstream end to limit the amount of cooling is disclosed.
［発明が解決しようとする課題］ すなわち、従来の気体加圧式連続鋳造法を図面に基づ
いて説明すると、第１図は気体加圧式ホットトップ連続
鋳造装置の縦断面図の一例であって、モールド１は、鋳
塊17の輪郭を規定する適当なる形状を有し、鋳塊17が形
成される空間を取り囲んでいる。モールド１は柱状金属
16,17を冷却するための冷却媒体４が流れる空洞部を有
する。冷却媒体を空洞部に供給する管３がモールド１に
接続されている。モールド１の内周面の一部から溶湯16
の熱が吸収され、溶湯は凝固を開始する。一時的に冷却
された金属を二次的に冷却するために、冷却媒体は噴出
口５から鋳塊17に向かって噴出される。モールド１の上
端面に耐熱耐火物からなる溶湯金属受槽２がボルト15に
よってモールド１に固定されている。溶湯受槽２はモー
ルド１と同軸状に配置されている。モールド１の内側上
面は外側面よりわずか低くなっており、溶湯受槽２の下
面との間に非常に小さく間隙８が形成されている。この
間隙８は流路７と導通しかつモールド内周面の全面にお
いて開口している。溶湯受槽２の下面の内側端部はモー
ルド１の内周面を覆うように水平に張り出しており、こ
のため内周面全体にオーバーハング部９が形成されてい
る。したがって間隙８から空気はオーバーハング部直下
に導入される。この導入された気体によって、耐火断熱
容器２とモールド１の内壁面とで形成された隅部に気体
加圧空間を形成する。これによって溶湯がモールドと接
触する接触点の位置を下げ、平滑なる気体加圧肌を得る
ことができる。[Problems to be Solved by the Invention] That is, a conventional gas pressurized continuous casting method will be described with reference to the drawings. FIG. 1 is an example of a vertical cross-sectional view of a gas pressurized hot-top continuous casting apparatus, and FIG. 1 has a suitable shape defining the contour of the ingot 17 and surrounds the space in which the ingot 17 is formed. Mold 1 is columnar metal
It has a cavity in which the cooling medium 4 for cooling the 16, 16 flows. A tube 3 for supplying a cooling medium to the cavity is connected to the mold 1. A part of the inner peripheral surface of the mold 1
Is absorbed and the molten metal starts to solidify. In order to secondarily cool the temporarily cooled metal, a cooling medium is jetted from the jet 5 toward the ingot 17. A molten metal receiving tank 2 made of a heat-resistant refractory is fixed to the mold 1 by bolts 15 on the upper end surface of the mold 1. The molten metal receiving tank 2 is arranged coaxially with the mold 1. The inner upper surface of the mold 1 is slightly lower than the outer surface, and a very small gap 8 is formed between the mold 1 and the lower surface of the molten metal receiving tank 2. The gap 8 communicates with the flow path 7 and is open on the entire inner peripheral surface of the mold. The inner end of the lower surface of the molten metal receiving tank 2 projects horizontally so as to cover the inner peripheral surface of the mold 1, and thus an overhang portion 9 is formed on the entire inner peripheral surface. Therefore, air is introduced from the gap 8 immediately below the overhang portion. The introduced gas forms a gas pressurized space at a corner formed by the refractory heat insulating container 2 and the inner wall surface of the mold 1. As a result, the position of the contact point where the molten metal contacts the mold can be lowered, and a smooth gas pressurized skin can be obtained.
第２図は水平連続鋳造装置の要部縦断面図の一例を示
す。アルミニウム合金製モールド21は環状冷却水ジャケ
ット22により冷却された円筒状内周面23を有する。アル
ミニウム合金溶湯がタンディッシュ30内の所定のレベル
30aに溜められる。溶湯は該出口31から耐火物製板体27
の金属溶湯流入口28を経由してモールド21に流入し29に
溜る。溶湯29の外周は円筒状内周面に接触して凝固殻を
形成し、モールド下流端に引き抜かれ、冷却スプレー41
により直接冷却されて鋳肌35を有する柱状凝固鋳塊34が
形成される。潤滑油が給油管25bよりモールド内分配管
を経てモールド内周面23に供給される。円筒状モールド
の軸芯21aより下方の、耐火物製板体27と円筒状モール
ド内周面23によって形成された隅部に気体圧を印加した
空間26を形成せしめ、金属溶湯29とモールド内周面23の
接触位置を下流域に偏移させる。FIG. 2 shows an example of a longitudinal sectional view of a main part of a horizontal continuous casting apparatus. The aluminum alloy mold 21 has a cylindrical inner peripheral surface 23 cooled by an annular cooling water jacket 22. Aluminum alloy melt is at a predetermined level in the tundish 30
Stored at 30a. The molten metal is supplied from the outlet 31 to the refractory plate 27.
Flows into the mold 21 via the molten metal inlet 28 and accumulates in the mold 29. The outer periphery of the molten metal 29 contacts the cylindrical inner peripheral surface to form a solidified shell, which is pulled out to the downstream end of the mold, and the cooling spray 41
Thus, a columnar solidified ingot 34 having a casting surface 35 is formed. Lubricating oil is supplied from the oil supply pipe 25b to the inner peripheral surface 23 of the mold via a distribution pipe in the mold. A gas pressure applied space 26 is formed at a corner formed by the refractory plate 27 and the cylindrical inner peripheral surface 23 below the axis 21a of the cylindrical mold, and the molten metal 29 and the inner periphery of the mold are formed. The contact position of the surface 23 is shifted to the downstream area.
これによって、金属溶湯とモールド内周面との水平方
向の接触位置を下流端側に偏移せしめて、冷却量を制限
でき、鋳塊の凝固のアンバランスを解決して、良好な品
質の鋳塊を得ることができる。As a result, the horizontal contact position between the molten metal and the inner peripheral surface of the mold can be shifted to the downstream end to limit the amount of cooling, solve the unbalance of solidification of the ingot, and improve the quality of the casting. Lumps can be obtained.
これらの鋳造方式にあっては、いずれもモールド内面
への潤滑剤の供給が必須であって、多くの場合この潤滑
剤には潤滑性に優れたヒマシ油または菜種油等の植物油
が利用される。In any of these casting methods, supply of a lubricant to the inner surface of the mold is essential, and in many cases, a vegetable oil such as castor oil or rapeseed oil having excellent lubricity is used as the lubricant.
しかしながら、これらの潤滑剤はモールド内で高温の
溶湯と接触して熱分解して蒸気となり、加圧気体と共に
鋳塊とモールド壁とのわずかな隙間を通って外部に放出
されるのが油の一部は炭化し、気体加圧式ホットトップ
鋳造法の場合には、溶湯受槽のオーバーハング部に、特
にモールド内面近傍に炭化物の堆積層を形成する。通気
性を具備した黒鉛リングを用いた直接チル鋳造法の場合
も、オーバーハングの同一部に炭化物の堆積層が形成さ
れる。However, these lubricants are thermally decomposed into steam by contacting the high-temperature molten metal in the mold, and are released to the outside through a small gap between the ingot and the mold wall together with the pressurized gas. In the case of the gas pressurized hot top casting method, a part of the carbonized material is carbonized, and a carbide deposited layer is formed on the overhang portion of the molten metal receiving tank, particularly near the inner surface of the mold. Also in the case of the direct chill casting method using a graphite ring having air permeability, a deposited layer of carbide is formed on the same portion of the overhang.
又、気体圧印加の水平式連続鋳造法においても、耐火
物製板体のオーバーハング面や溶湯流入孔にも炭化物の
堆積層が形成される。Also, in the horizontal continuous casting method in which gas pressure is applied, a carbide deposit layer is also formed on the overhang surface of the refractory plate and the molten metal inflow hole.
これらの炭化物堆積層は、潤滑剤の分解成分と見ら
れ、耐火物面に固着している。These carbide deposits are considered to be decomposed components of the lubricant and are fixed to the refractory surface.
そしてこの炭化物の堆積層には、溶湯金属、特にアル
ミニウムやアルミニウム合金溶湯が付着しやすい傾向を
持ち、アルミ溶湯の皮膜がこぶりついて鋳肌の平滑性を
喪失するだけでなく、凝固殻の裂開による鋳肌割れの発
生、更には凝固殻の激しい裂開によるモールド外部への
金属溶湯の流出等鋳塊品質、鋳造特性に与える炭化物堆
積層の形成の影響は大きい。更には、炭化物堆積層が剥
離して鋳肌に巻き込まれて鋳肌不良を起こすこともあ
る。Molten metal, especially aluminum or aluminum alloy melt, tends to adhere to this carbide deposit layer, and not only does the aluminum melt coat spill over, losing the smoothness of the casting surface, but also cracking the solidified shell. The formation of the carbide deposit layer greatly affects the quality of the ingot and the casting characteristics, such as the occurrence of cracks in the casting surface due to cracking and the flow of molten metal to the outside of the mold due to severe cracking of the solidified shell. Furthermore, the carbide deposit layer may peel off and get caught in the casting surface, resulting in poor casting surface.
この炭化物堆積層は突然に形成されるのではなく、時
間と共に堆積量が増えていくものであるのでバッチ式に
て鋳造が行なわれる垂直式半連続鋳造法の場合はバッチ
の途中で堆積した炭化層を機械的な方法で削り取らねば
ならず、作業が繁雑になる。一方、垂直式の連続鋳造法
や水平式連続鋳造法の場合には、鋳肌欠陥の発生頻度の
増大や、鋳造トラブルの発生によって鋳造を途中で停止
せねばならず、このために連続鋳造の目的とするところ
に反して、甚だ不利である。This carbide deposited layer is not suddenly formed, but increases in amount with time. Therefore, in the case of a vertical semi-continuous casting method in which casting is performed in a batch type, the carbonized layer deposited in the middle of the batch is The layers have to be scraped off by a mechanical method, which complicates the work. On the other hand, in the case of the vertical continuous casting method or the horizontal continuous casting method, casting must be stopped halfway due to an increase in the frequency of casting surface defects and occurrence of casting troubles. It is very disadvantageous, contrary to the purpose.
したがって、オーバーハングもしくは溶湯流入孔やタ
ンディッシュ側の耐火物製板体の湯溜り部への炭化物堆
積層の形成を防止することは極めて重要である。Therefore, it is extremely important to prevent the formation of a carbide deposition layer in the overhang or the molten metal inflow hole or the pool portion of the refractory plate on the tundish side.
［課題を解決するための手段］ 上述した問題点を解決すべく、本発明者は鋭意研究を
重ねた結果、モールド内周面に液状潤滑剤が供給され、
かつモールド内金属溶湯の周面に気体圧を印加する金属
の連続鋳造法において、前記圧力印加気体が、酸素25〜
80vol％、残部が窒素、アルゴン、炭酸ガス等酸素と爆
発性混合物を作ったり、又はモールド材質や鋳造するア
ルミニウム又はその合金と激しく反応しない不活性又は
不燃性ガスの１種もしくは２種以上からなる気体である
ことを特徴とする金属の連続鋳造方法が有効であること
を突き止め、開発を完成した。[Means for Solving the Problems] In order to solve the above-mentioned problems, the present inventors have conducted intensive studies and as a result, a liquid lubricant has been supplied to the inner peripheral surface of the mold,
In the continuous casting method for applying a gas pressure to the peripheral surface of the molten metal in the mold, the pressure-applying gas is oxygen 25 to
80 vol%, the balance consists of one or more inert or nonflammable gases that do not form explosive mixtures with oxygen, such as nitrogen, argon, carbon dioxide, or react violently with the mold material or aluminum or its alloys to be cast We have found that the continuous casting method of metal, which is a gas, is effective and completed the development.
すなわち、モールド内周面に液状潤滑剤が供給され、
かつモールド内金属溶湯の周面に気体圧が印加される金
属の連続鋳造法において、前記圧力印加気体が酸素25〜
80容量％、好ましくは40〜70％、残部が不活性又は不燃
性ガスからなる気体を用いれば、ホットトップ式鋳造法
にあってはオーバーハング部への炭化物の堆積層の生成
を激減させ、水平連続鋳造法の場合にも、耐火物製板体
面への炭化物の堆積を激減させることができる。That is, the liquid lubricant is supplied to the inner peripheral surface of the mold,
In the continuous casting method of metal in which gas pressure is applied to the peripheral surface of the molten metal in the mold, the pressure-applied gas is oxygen 25 to
If a gas consisting of 80% by volume, preferably 40 to 70%, and the balance is made of an inert or nonflammable gas is used, in a hot-top casting method, the formation of a deposited layer of carbide on the overhang portion is drastically reduced, Even in the case of the horizontal continuous casting method, the accumulation of carbides on the refractory plate body surface can be drastically reduced.
これは、加圧用気体に含まれる酸素が液状潤滑剤の成
分の酸化分解を促進し、炭化物の堆積層を形成する成分
を減じる役割を持つものと考えられる。又、液状潤滑剤
の熱分解ガスを安定なCO、CO2ガスへと酸化させ、モー
ルド外部へ放出させるので、断熱耐火物製のオーバーハ
ング部や、耐火物製板体に炭化物を形成する有害な成分
を減じることが可能であって、炭化物の堆積層を激減す
ることが出来るのである。This is considered to be due to the fact that oxygen contained in the pressurizing gas promotes the oxidative decomposition of the components of the liquid lubricant, and plays a role in reducing the components forming the carbide deposited layer. In addition, since the thermal decomposition gas of the liquid lubricant is oxidized to stable CO and CO 2 gas and released to the outside of the mold, the harmful effect of forming carbides on the overhang portion made of adiabatic refractory or the refractory plate In addition, it is possible to reduce various components, and it is possible to drastically reduce the deposited layer of carbide.
一方、酸素分圧の高いガスが、モールド内の溶湯と直
接接触するので、気体加圧空間により凝固なアルミニウ
ム酸化皮膜が形成され、モールドとの接触に対して抵抗
が高まるので、従来の方法で得られた以上に鋳造の安定
化がはかられ、鋳肌のきれいな鋳造物が得られるもので
ある。さらに驚くべきことには、液状潤滑剤を積極的に
分解する条件下で鋳造を行なうのであるから、液状潤滑
剤の必要量が増加すると思われるのに対し、酸化皮膜の
強化によって液状潤滑剤量を従来よりも減じてスムース
に操業することが出来るようになった。その結果とし
て、炭化物の堆積の形成を減じることにも寄与できるの
である。On the other hand, since the gas having a high oxygen partial pressure comes into direct contact with the molten metal in the mold, a solidified aluminum oxide film is formed by the gas pressurized space, and the resistance to contact with the mold increases. The casting is more stabilized than obtained, and a casting with a clean casting surface can be obtained. Even more surprisingly, since the casting is performed under the condition that the liquid lubricant is actively decomposed, the required amount of the liquid lubricant is expected to increase, while the amount of the liquid lubricant is increased by strengthening the oxide film. Can be operated more smoothly than before. As a result, it can also contribute to reducing the formation of carbide deposits.
［実施例］ 本発明の実施例を説明する。[Example] An example of the present invention will be described.
（実施例１） 第１図に示した気体加圧式ホットトップ連続鋳造装置
のいいて、加圧用気体に酸素分圧が50％の窒素混合ガス
を用いてJIS6063アルミニウム合金ビレットを鋳造し
た。そのときの鋳造条件は以下の通りである。(Example 1) A JIS6063 aluminum alloy billet was cast using a gas pressurized hot-top continuous casting apparatus shown in FIG. 1 using a nitrogen mixed gas having a partial pressure of oxygen of 50% as a pressurizing gas. The casting conditions at that time are as follows.
ａ）合金種 JIS60643アルミニウム合金 ｂ）ビレット直径 156mm ｃ）鋳造速度 150mm/分 ｄ）冷却水量 60l/分 ｅ）潤滑油種 ヒマシ油 ｆ）潤滑油量 0.5cc/分 ｇ）気体流量 １／分 ｈ）鋳造温度 690℃ この結果、延べ400mmの鋳造の間、鋳肌は平滑さが保
たれ、鋳造トラブルなく推移した。a) Alloy type JIS60643 aluminum alloy b) Billet diameter 156mm c) Casting speed 150mm / min d) Cooling water amount 60l / min e) Lubricating oil type Castor oil f) Lubricating oil amount 0.5cc / min g) Gas flow rate 1 / min h ) Casting temperature 690 ° C As a result, during casting of a total of 400 mm, the casting surface was kept smooth and remained without casting problems.
使用後の耐火・断熱容器のオーバーハング部には潤滑
油の炭化層がほとんど見られなかった。Almost no carbonized layer of lubricating oil was found in the overhang portion of the fireproof / insulated container after use.
（比較例１） 実施例１の中で加圧用気体として空気を使用した以外
はすべて同一条件で鋳造を行なったところ、延べ150mで
鋳肌にたて筋状の欠陥が生じ、鋳肌の平滑度が損なわれ
た。250mで鋳肌に横割れが発生し、製品に対して重大な
欠陥を生じさせた。使用後の耐火・断熱容器のオーバー
ハング部には高さが約1mmの潤滑剤の分解による炭化物
の堆積層が形成されており、部分的にはアルミの付着が
見られた。炭化物の堆積層をヘラではがし取った後に再
度鋳造したところ、問題なく鋳造ができた。(Comparative Example 1) Casting was carried out under the same conditions as in Example 1 except that air was used as the pressurizing gas. Degree was impaired. At 250m, side cracks occurred on the casting surface, causing serious defects in the product. A deposited layer of carbide was formed on the overhang part of the fire-resistant and heat-insulated container after use by decomposition of the lubricant with a height of about 1 mm, and aluminum was partially adhered. When the carbide layer was removed with a spatula and cast again, casting was completed without any problem.
（実施例２） 第２図に示した水平式連続鋳造装置において、加圧用
気体に酸素分圧が40％のアルゴン混合ガスを用いてJIS2
014アルミニウム合金連鋳棒を鋳造した。そのときの鋳
造条件は、以下の通りであった。(Example 2) In the horizontal continuous casting apparatus shown in FIG. 2, JIS2 was performed using an argon mixed gas having a partial pressure of oxygen of 40% as a pressurizing gas.
A 014 aluminum alloy continuous rod was cast. The casting conditions at that time were as follows.
ａ）合金種 JIS60643アルミニウム合金 ｂ）鋳塊直径 67mm ｃ）引抜速度 300mm/分 ｄ）冷却水量 20l/分 ｅ）潤滑油種 菜種油 ｆ）潤滑油量 2cc/分 ｇ）気体流量 0.2l/分 ｈ）鋳造温度 695℃ この結果延べ180mの鋳造の期間で、鋳肌は安定した平
滑肌が保たれ、鋳造トラブルなく推移した。使用後の耐
火物製板体の溶湯との接触面には潤滑剤の分割物による
炭化物の堆積層はほとんど見られなかった。a) Alloy type JIS60643 aluminum alloy b) Ingot diameter 67mm c) Drawing speed 300mm / min d) Cooling water amount 20l / min e) Lubricating oil type Rapeseed oil f) Lubricating oil amount 2cc / min g) Gas flow rate 0.2l / min h ) Casting temperature 695 ° C As a result, during the casting period of a total of 180m, the casting surface was kept stable and smooth, and there was no casting trouble. Almost no deposited layer of carbide due to the divided lubricant was found on the contact surface of the refractory plate after use with the molten metal.
（比較例２） 実施例２の中で、加圧用気体としてアルゴンガスを使
用した以外はすべて同一条件で鋳造を行なったところ、
延べ70mで鋳肌に引抜方向と平行なたて筋状の欠陥の発
生と黒い炭化皮膜の付着が時折見られ、鋳造距離が更に
長くなると共に欠陥が大きくなって、ついには160mmで
ちぎれて鋳造が不能となった。鋳造後、耐火物製板体を
外して調べたところ、モールド内にばく露している溶湯
接触面のモールド内壁面近傍に円周状に約0.8mmの炭化
物層が形成されていた。(Comparative Example 2) In Example 2, casting was performed under the same conditions except that argon gas was used as a pressurizing gas.
Occurrence of vertical streak defects parallel to the drawing direction and adhesion of black carbonized film are occasionally seen on the casting surface at a total length of 70 m, the casting distance becomes longer and the defects become larger, and finally the casting breaks at 160 mm Became impossible. After casting, the refractory plate was removed and examined. As a result, a carbide layer of about 0.8 mm was formed circumferentially near the inner wall of the mold at the contact surface of the molten metal exposed in the mold.
その後、新たな耐火物製板体に取りかえて鋳造したと
ころ、問題なく鋳造が出来た。After that, when the casting was replaced with a new refractory plate, the casting was completed without any problem.
（実施例３） 第２図に示した水平式連続鋳造装置において、加圧用
気体に酸素分圧が70％の窒素混合ガスを用いてJIS2218
アルミニウム合金連鋳棒を鋳造した。鋳造条件は以下の
通りであった。Example 3 In the horizontal continuous casting apparatus shown in FIG. 2, JIS2218 was used by using a nitrogen mixed gas having a partial pressure of oxygen of 70% as a pressurizing gas.
Aluminum alloy continuous cast bars were cast. The casting conditions were as follows.
ａ）合金種 JIS2218アルミニウム合金 ｂ）鋳塊直径 67mm ｃ）引抜速度 300mm/分 ｄ）冷却水量 20l/分 ｅ）潤滑油種 ヒマシ油 ｆ）気体流量 0.2l/分 ｇ）鋳造温度 690℃ この時、潤滑油量を調整して、鋳肌に潤滑油不足がも
とで、引つり欠陥（継筋状引かき欠陥）が発生する最少
限度量を求めたところ、その値は1.5cc/分であった。a) Alloy type JIS2218 aluminum alloy b) Ingot diameter 67mm c) Extraction speed 300mm / min d) Cooling water amount 20l / min e) Lubricating oil castor oil f) Gas flow rate 0.2l / min g) Casting temperature 690 ° C When the amount of lubricating oil was adjusted and the minimum amount of pulling defects (streak-like scratching defects) was found due to lack of lubricating oil on the casting surface, the value was 1.5 cc / min. Was.
（比較例３） 実施例３の中で、加圧用気体に空気を用いた以外は、
すべて同一鋳造条件で鋳造を行ない、潤滑油量の最少限
度量を求めたところ、その値は2.5cc/分であった。(Comparative Example 3) In Example 3, except that air was used as the pressurizing gas,
Casting was performed under the same casting conditions, and the minimum amount of lubricating oil was determined. The value was 2.5 cc / min.
［効果］ 上述したように、気体加圧用のガスに酸素分圧の高い
不活性ガスを用いることによって、断熱耐火物製容器の
オーバーハング部や、耐火物製板体面の液状潤滑剤によ
る炭化物の堆積層の形成や液状潤滑剤量を著しく減じる
ことができる。[Effects] As described above, by using an inert gas having a high oxygen partial pressure as the gas for pressurizing the gas, the overhang portion of the heat-insulating refractory container and the carbide of the refractory plate due to the liquid lubricant on the surface of the refractory plate body are removed. The formation of the deposited layer and the amount of the liquid lubricant can be significantly reduced.
この酸素分圧が高い加圧用気体の成分としては、窒素
やアルゴン、ヘリウム、炭酸ガスのような不活性かつ不
燃性ガスに限定されず、六弗化硫黄ガス（SF6ガス）の
ような溶湯の熱によってガス自体が熱分解し、その熱分
解ガスが炭化物もしくは液状潤滑剤の熱分解ガスと反応
する特性を持ったガスを酸素と共に用いても同様な効果
がもたらせる。The components of the pressurizing gas having a high oxygen partial pressure are not limited to inert and non-flammable gases such as nitrogen, argon, helium, and carbon dioxide, but are not limited to molten metal such as sulfur hexafluoride gas (SF 6 gas). The same effect can be obtained by using a gas having a characteristic in which the gas itself is thermally decomposed by the heat of the gas and the pyrolysis gas reacts with the pyrolysis gas of a carbide or a liquid lubricant together with oxygen.
更に、酸素分圧の高い加圧用気体は、アルミ溶湯の外
周面に強固な酸化皮膜を形成して、鋳肌の平滑化、鋳造
の安定化に対して有効であることから、潤滑剤を要し、
気体をモールド内部の溶湯面に供給して実施する鋳造方
式のいずれに対しても適用できるのであって、オーバー
ハングを有するホットトップ鋳造法だけに限定されるも
のではない。In addition, pressurizing gas with a high oxygen partial pressure forms a strong oxide film on the outer peripheral surface of the molten aluminum and is effective for smoothing the casting surface and stabilizing the casting. And
The present invention can be applied to any casting method in which a gas is supplied to a molten metal surface inside a mold, and is not limited to a hot top casting method having an overhang.
第１図は、気体加圧式ホットトップ鋳造法の装置断面
図。 第２図は、気体圧印加式水平連続鋳造法の装置断面図で
ある。FIG. 1 is a sectional view of an apparatus of a gas pressurized hot top casting method. FIG. 2 is a cross-sectional view of the apparatus of the horizontal continuous casting method of the gas pressure application type.
Claims (1)
かつモールド内金属溶湯の周面に気体圧が印加される金
属の連続鋳造法において、前記圧力印加気体が酸素25〜
80容量％を含有する気体であることを特徴とする金属の
連続鋳造方法。1. A liquid lubricant is supplied to an inner peripheral surface of a mold,
In the continuous casting method of metal in which gas pressure is applied to the peripheral surface of the molten metal in the mold, the pressure-applied gas is oxygen 25 to
A continuous casting method for metal, characterized in that it is a gas containing 80% by volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21784888A JP2707283B2 (en) | 1988-08-31 | 1988-08-31 | Metal continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21784888A JP2707283B2 (en) | 1988-08-31 | 1988-08-31 | Metal continuous casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0263647A JPH0263647A (en) | 1990-03-02 |
| JP2707283B2 true JP2707283B2 (en) | 1998-01-28 |
Family
ID=16710710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21784888A Expired - Fee Related JP2707283B2 (en) | 1988-08-31 | 1988-08-31 | Metal continuous casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2707283B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018034164A1 (en) * | 2016-08-18 | 2018-02-22 | 昭和電工株式会社 | Vertical-type continuous casting method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO302804B1 (en) * | 1995-09-08 | 1998-04-27 | Norsk Hydro As | Equipment for horizontal direct cooled casting of light metals, especially magnesium and magnesium alloys |
| US20060118269A1 (en) * | 2002-07-22 | 2006-06-08 | Yasuhide Odashima | Continuous cast aluminium alloy rod and production method and apparatus thereof |
| US8058636B2 (en) | 2007-03-29 | 2011-11-15 | Panasonic Corporation | Variable resistance nonvolatile memory apparatus |
| JP2011167157A (en) * | 2010-02-22 | 2011-09-01 | Zenkoku Nogyo Kyodo Kumiai Rengokai | Plant cultivation container |
| CN104384464B (en) * | 2014-12-01 | 2017-03-08 | 西南铝业（集团）有限责任公司 | A kind of apparatus and method of cleaning crystallizer |
-
1988
- 1988-08-31 JP JP21784888A patent/JP2707283B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018034164A1 (en) * | 2016-08-18 | 2018-02-22 | 昭和電工株式会社 | Vertical-type continuous casting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0263647A (en) | 1990-03-02 |
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