JPS61212448A - Method and apparatus for producing thick-walled hollow billet - Google Patents
Method and apparatus for producing thick-walled hollow billetInfo
- Publication number
- JPS61212448A JPS61212448A JP5204985A JP5204985A JPS61212448A JP S61212448 A JPS61212448 A JP S61212448A JP 5204985 A JP5204985 A JP 5204985A JP 5204985 A JP5204985 A JP 5204985A JP S61212448 A JPS61212448 A JP S61212448A
- Authority
- JP
- Japan
- Prior art keywords
- water
- cooled
- core
- cooled core
- solidification
- 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.)
- Granted
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
- B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
弦五圀団
本発明は中空ビレットの製造方法およびその装置に係わ
り、肉厚が１００ｍｍ、好ましくは２゜Ｏｍｍもしくは
それ以上であるような特に厚肉の中空ビレットを割れ等
の欠陥を生じること無く連続的に鋳造できるようになす
方法および装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hollow billet manufacturing method and an apparatus for producing a hollow billet, particularly for cracking a thick hollow billet having a wall thickness of 100 mm, preferably 2° Omm or more. It relates to a method and apparatus that enable continuous casting without causing defects such as.
鵞】１１度
中空状の例えばアルミニウムのような金属製ビレットを
連続的に製造する装置として、一般に第２図に示すよう
な鋳造装置が提供されている。この装置は玉章解放され
ている水冷鋳型１ｏ、この中央部に配備された水冷中子
１１、および水冷鋳型ｌＯと水冷中子１１との間の空間
部の底部を閉鎖でき且つその位置から降下できる受け台
１２を有して構成されている。水冷鋳型１０は内周面１
０ａが鋳造面を形成しており、内周側の下端付近に冷却
水の排出口１０ｂが適当な間隔で形成されている。一方
水冷中子１１は外周面１１ａが鋳造面を形成しており、
その下端付近に冷却水の排出口１１ｂが適当な間隔で形
成されている。何れも適当な冷却水供給装置（図示せず
）に接′１ｆｔ（水冷中子１１は上部中央の管１１Ｃを
介して接続される）されており、供給された冷却水はそ
れぞれの排出口１０ｂおよびｌｌｂから図示したように
斜め下方へ向けて放出される（それぞれ符号１３および
１４で示す）ようになっている。受け台１２は当初は水
冷鋳型１０と水冷中子１１との間の空間部の底部を閉鎖
する位置に保持され、該空間部内に供給された金属溶湯
１５が冷却されて凝固を開始した後（凝固部分は符号１
５°で示される）、凝固開始面Ａを所定位置に維持する
（縁における凝固開始点Ｐ＋ 、Ｐｇを水冷鋳型１０お
よび水冷中子１１のそれぞれの鋳造面の所定位置に維持
する）ように制御されて降下される。このようにして、
連続的に凝固部分１５゛が下方へ引き出されて中空状の
ビレットが製造されるようになっている。尚、符号１６
は溶湯供給のために水冷鋳型１０と水冷中子１１との間
に配備されたフロート、そして符号１７はこのフロート
１７と組合わされたディップチューブをそれぞれ示して
いる。2. Description of the Related Art Generally, a casting apparatus as shown in FIG. 2 is provided as an apparatus for continuously producing an 11 degree hollow billet made of metal such as aluminum. This device can close the open water-cooled mold 1o, the water-cooled core 11 disposed in the center, and the bottom of the space between the water-cooled mold 10 and the water-cooled core 11, and can be lowered from that position. It is configured with a cradle 12 that can be used. The water-cooled mold 10 has an inner peripheral surface 1
0a forms a casting surface, and cooling water discharge ports 10b are formed at appropriate intervals near the lower end on the inner peripheral side. On the other hand, the outer peripheral surface 11a of the water-cooled core 11 forms a casting surface,
Cooling water discharge ports 11b are formed near the lower end at appropriate intervals. Each of them is connected to a suitable cooling water supply device (not shown) by 1ft (the water cooling core 11 is connected via a pipe 11C at the center of the upper part), and the supplied cooling water is discharged from each outlet 10b. and llb (indicated by reference numerals 13 and 14, respectively) diagonally downward as shown in the figure. The pedestal 12 is initially held in a position that closes the bottom of the space between the water-cooled mold 10 and the water-cooled core 11, and after the molten metal 15 supplied into the space has cooled and started solidifying ( The solidified part is code 1
5°), the solidification start surface A is maintained at a predetermined position (the solidification start point P+ at the edge, Pg is maintained at a predetermined position on each casting surface of the water-cooled mold 10 and the water-cooled core 11). and descended. In this way,
The solidified portion 15' is continuously pulled downward to produce a hollow billet. In addition, code 16
1 shows a float placed between the water-cooled mold 10 and the water-cooled core 11 for supplying molten metal, and 17 shows a dip tube combined with this float 17, respectively.
ｌ米茨丘曵皿塁点
しかしながら上述した従来技術においては、例えば外径
が２５０ｍｍを超え肉厚が１００ｍｍを越えるような厚
肉の中空ビレットを製造すると、熱間割れ感受性の大き
い合金によっては（例えば６０００系、５０００系等の
Ａｉ！合金）鋳造割れが発生したり著しい発汗が生じ、
ひどい場合にはこの発汗部を通してメタル漏れが起こる
（特に３０００系のＡＩＶ合金）等、安定した鋳造が実
際問題として実行できなかった。However, with the above-mentioned conventional technology, if a thick hollow billet with an outer diameter of more than 250 mm and a wall thickness of more than 100 mm is manufactured, depending on the alloy with high hot cracking susceptibility, For example, Ai! alloys such as 6000 series and 5000 series) may cause casting cracks or significant sweating.
In severe cases, metal leakage occurs through this sweating part (particularly in 3000 series AIV alloys), making stable casting impossible as a practical matter.
この理由は次のように説明される。即ち、供給された溶
湯１５は水冷鋳型１０および水冷中子１１によって内外
両側から大体同じ高さ位置で冷却されるようになってい
たために、凝固開始面Ａは中空ビレットの壁部の縦断面
において中央付近が下方へ凹んだ形状を呈することにな
る。このため、任意の横断面における凝固の推移につい
て考えれば、その内外両端から溶湯１５のサンプ最下点
１５ａに垂直な位置へ向けて次第に凝固が進むことにな
る。従って先行して凝固した内周側および外周側の部分
がそれより内部の凝固収縮を拘束するように作用し、こ
の作用は凝固が進行するにつれて大きくなり、この凝固
収縮の拘束により発生する内部応力が材料の強度を越え
た時に割れが発生するものと思われる。このような割れ
は製造する中空ビレットの肉厚が厚くなるほど発生し易
くなるのであり、このことが厚肉の中空ビレットの製造
を困難にしていたのである。また、このような割れは実
際には内周シェルにまで伝播し、また中心に向かう形で
発生することが認められている。The reason for this is explained as follows. That is, since the supplied molten metal 15 was cooled at approximately the same height from both the inside and outside sides by the water-cooled mold 10 and the water-cooled core 11, the solidification start surface A is located at the longitudinal section of the wall of the hollow billet. The shape is concave downward near the center. Therefore, if we consider the progress of solidification in an arbitrary cross section, solidification will gradually proceed from both the inner and outer ends of the molten metal 15 toward a position perpendicular to the lowest point 15a of the sump. Therefore, the inner and outer circumferential parts that solidified earlier act to restrain the solidification contraction inside them, and this effect increases as solidification progresses, and the internal stress generated by the restraint of this solidification contraction. It is thought that cracks occur when the strength of the material exceeds the strength of the material. Such cracks are more likely to occur as the thickness of the hollow billet to be manufactured increases, and this has made it difficult to manufacture thick hollow billets. Furthermore, it has been recognized that such cracks actually propagate to the inner peripheral shell and also occur toward the center.
更にまた、第２図では同じ高さ寸法として水冷鋳型１０
および水冷中子１１を示したが、構成上一般に水冷中子
の冷却能力の方が弱くなるとともに、フロート１６が鋳
込まれてしまうのを防止するために、水冷中子１１の高
さは水冷鋳型１０よりも鋳込み方向に長くされる。この
ような水冷中子１１の鋳造面１１ａは、溶湯の凝固収縮
により噛まれて中空ビレットの引き出しとともに下方へ
持ち去られるのを防止するために、通常は下方へ向けて
細くなるテーパー面とされている。このために実際には
凝固開始点Ｐ８より下方の凝固部分は水冷中子１１の鋳
造面１１ａと僅かな間隙を形成する。この間隙の形成さ
れる高さ範囲は水冷中子１１の高さ寸法が長くなった分
だけ長くなり、このために排出口１１ｂからの冷却水で
直接に冷却されるまでの時間が長くなる。このことは、
一旦凝固された内周側の凝固シェルが溶湯１５からの伝
達熱で再び溶融されてしまう事態、即ち発汗の発生を容
易に生せしめることになるのである。Furthermore, in FIG. 2, the water-cooled mold 10 has the same height dimension.
and water-cooled core 11 are shown, but the cooling capacity of the water-cooled core is generally weaker due to the structure, and in order to prevent the float 16 from being cast, the height of the water-cooled core 11 is It is made longer than the mold 10 in the casting direction. The casting surface 11a of such a water-cooled core 11 is normally made into a tapered surface that tapers downward in order to prevent it from being bitten by the solidification contraction of the molten metal and being carried away downward when the hollow billet is pulled out. There is. Therefore, in reality, the solidified portion below the solidification start point P8 forms a slight gap with the casting surface 11a of the water-cooled core 11. The height range in which this gap is formed becomes longer as the height dimension of the water-cooled core 11 becomes longer, and therefore the time until it is directly cooled by the cooling water from the discharge port 11b becomes longer. This means that
The solidified shell on the inner peripheral side, which has been solidified once, is easily melted again by the heat transferred from the molten metal 15, that is, sweating easily occurs.
著しい場合には、この再溶融によって該間隙を通して溶
湯が漏れる危険を生じるのである。In severe cases, this remelting creates a risk of leakage of the molten metal through the gap.
又ユ五亘煎
本発明の目的は上述に鑑み、割れや表面欠陥のない良好
な、肉厚の厚い中空ビレットをできるだけ容易に製造可
能とする方法および装置を提供することである。In view of the above, it is an object of the present invention to provide a method and apparatus that make it possible to manufacture thick-walled hollow billets without cracks or surface defects as easily as possible.
ｍ口１！
このために本発明は、上下が解放された金属製の水冷鋳
型の中央部に金属製の水冷中子を配備し、前記水冷鋳型
と水冷中子との間に形成された空間部に熱溶融された材
料を供給するとともに、当初は前記空間部の底部を閉鎖
している受け台を、供給された前記材料が１！固を開始
する位置（′ａ固開開始点を前記空間部内に維持させる
状態で降下させ、これによって前記空間部内で凝固され
た中空ビレットを連続的に引き出して製造する場合にお
いて、前記水冷中子における前記材料の冷却開始点を前
記水冷鋳型における冷却開始点よりも相対的に低下させ
、該強固開始点と凝固開始面における最下点との間の実
質的なサンプ深さを、鋳造条件（中空ビレットの肉厚、
受け台の降下速度、金属溶湯の温度、冷却能力等）に応
じて定められ得る製品の割れが生じない許容深さ以下に
調整するようにしたことを特徴とする
特に本発明の好ましい構成としては、水冷中子の鋳造面
の上側部分を耐火断熱材で覆い、これにより水冷中子側
の凝固開始点が該耐火断熱材より下方の水冷金型鋳造面
に位置するように強制的に低下させたことを特徴とする
のである。m mouth 1! To this end, the present invention provides a metal water-cooled core in the center of a metal water-cooled mold with open top and bottom, and heat melts in the space formed between the water-cooled mold and the water-cooled core. At the same time, the supplied material fills the cradle which initially closes the bottom of the space, and the supplied material is 1! In the case where the hollow billet solidified in the space is produced by lowering the solidification start point ('a) while maintaining the solidification start point within the space, the water-cooled core is The cooling start point of the material in is relatively lower than the cooling start point in the water-cooled mold, and the substantial sump depth between the solid start point and the lowest point on the solidification start surface is adjusted according to the casting conditions ( Thickness of hollow billet,
A particularly preferred configuration of the present invention is that the depth is adjusted to below a permissible depth that does not cause cracking of the product, which can be determined depending on the descending speed of the pedestal, the temperature of the molten metal, cooling capacity, etc.) , the upper part of the casting surface of the water-cooled core is covered with a refractory insulation material, thereby forcibly lowering the solidification start point of the water-cooled core side so that it is located on the casting surface of the water-cooled mold below the refractory insulation material. It is characterized by the following.
以下に第１図を参照して本発明を実施するための一実施
例を参照して更に詳しく説明する。An embodiment of the present invention will be described in more detail below with reference to FIG.
に只す の な１日
第１図に示す実施例において、水冷鋳型１０は第１図に
示したのと実質的に相違しないので、同一符号で示して
いる。また、受け台１２も形状は第１図に示したのと相
違する（水冷鋳型と水冷中子との形状に応じて相違する
）が、機能的には全く同一であるので同一符号で示して
いる。これに対し、水冷中子は本発明の特徴とするもの
であり、ここでは符号１で示す。In the embodiment shown in FIG. 1, the water-cooled mold 10 is not substantially different from that shown in FIG. 1 and is designated by the same reference numerals. The shape of the pedestal 12 is also different from that shown in FIG. 1 (depending on the shapes of the water-cooled mold and the water-cooled core), but since they are functionally the same, they are designated by the same reference numerals. There is. On the other hand, the water-cooled core is a feature of the present invention, and is designated by the reference numeral 1 here.
この水冷中子１は、上側部分に耐火断熱材２がその外周
面に沿って取付けられている。鋳造面ｌａは耐火断熱材
２の下側に位置するように形成され、また鋳造面１ａの
下端に沿って前述と同様に冷却水の排出口１ｂが、そし
て上部中央に冷却水の供給のための管１ｃがそれぞれ備
えられている。This water-cooled core 1 has a refractory heat insulating material 2 attached to its upper portion along its outer peripheral surface. The casting surface la is formed to be located below the refractory heat insulating material 2, and the cooling water outlet 1b is provided along the lower end of the casting surface 1a as described above, and at the center of the upper part for supplying cooling water. The tubes 1c are respectively provided.
即ち、水冷中子側の凝固開始点Ｐオが実際に位置される
水冷鋳型ｌＯの鋳造面１０ａの凝固開始点Ｐ、よりも相
対的に下方に位置され、耐火断熱材２はその表面で凝固
が起こらずにその下方の鋳造面１ａで起こるように、凝
固開始点Ｐ８を強制的に低下させる働き意図されている
のである。ここで、耐火断熱材２の内周面が鋳造面１ａ
よりも張り出して図示されているが、これは水冷中子１
が鋳込まれて下方へ持ち去られてしまうのを積極的に防
止することを意図されているのであり、望まれるならば
張り出しを無（して同一面に形成することもできる。That is, the solidification start point P on the water-cooled core side is located relatively lower than the solidification start point P on the casting surface 10a of the water-cooled mold 1O where it is actually located, and the refractory insulation material 2 solidifies on that surface. This is intended to forcibly lower the solidification start point P8 so that solidification does not occur and instead occurs on the casting surface 1a below. Here, the inner circumferential surface of the refractory heat insulating material 2 is the casting surface 1a.
Although it is shown more protruding than the figure, this is water-cooled core 1.
It is intended to actively prevent the mold from being carried away downwards, and can be formed flush with no overhang if desired.
このような構成によれば、前述したように金属溶湯１５
を水冷鋳型１０と水冷中子１との間の空間部内へ供給し
、凝固開始点Ｐ＋およびＰ２を図示位置に維持するよう
に受け台１２を降下させて連続鋳造する場合、冷却開始
面Ａは第１図に示すようにそのサンプ最下点１５ａが水
冷中子ｌの鋳造画１ａに近い位置となる。即ち、耐火断
熱材２によって凝固開始点Ｐ２が強制的に鋳造面ｌａ上
に押し下げられ、水冷鋳型１０からの冷却と、相対的に
下方に位置せる水冷中子１からの冷却との兼ね合いから
、サンプ最下点１５ａがこのように位置決めされること
になる。一般に耐火断熱材２によって凝固開始点Ｐ！を
強制的に押し下げると、凝固開始点Ｐ、は耐火断熱材２
と鋳造面１ａとの接合点に位置される傾向を示す。従っ
てこのために特に水冷中子１の冷却能力を制御する必要
性はないが、全体的な冷却作用の兼ね合い等から適当に
水冷中子１の冷却能力を変更することはでき、またもし
鋳造面１ａの例えば中間部の何れかの位置に凝固開始点
Ｐｇを位置させたい場合にはそれ相応に冷却能力を制御
すれば良い。このような凝固開始点ＰＩおよびＰ！の位
置に応じて形成された凝固開始面Ａによれば、任意の断
面における凝固の進行を考えると、先ず外周側から凝固
が開始されて凝固シェルを形成することになるが、内周
側の凝固が開始するまではこの凝固シェルは拘束するシ
ェルとなり得ず、内周側からの凝固が開始されて始めて
内外両側の凝固シェルが拘束シェルとして作用すること
になる。従って実質的なサンプ深さは符号Ｈ１で示す深
さとなり、前述した凝固収縮にもとづく割れの原因とな
る実質的なサンプ深さＨｌが極めて小さいものとされる
のである。According to such a configuration, as described above, the molten metal 15
When continuous casting is performed by supplying water into the space between the water-cooled mold 10 and the water-cooled core 1 and lowering the pedestal 12 to maintain the solidification start points P+ and P2 at the positions shown in the figure, the cooling start surface A is As shown in FIG. 1, the lowest point 15a of the sump is located close to the casting image 1a of the water-cooled core 1. That is, the solidification start point P2 is forcibly pushed down onto the casting surface la by the refractory heat insulating material 2, and due to the balance between cooling from the water-cooled mold 10 and cooling from the water-cooled core 1 located relatively below, The lowest point 15a of the sump is thus positioned. Generally, the solidification start point P! When pressed down forcibly, the solidification starting point P is the fireproof insulation material 2
and the casting surface 1a tend to be located at the junction. Therefore, it is not necessary to particularly control the cooling capacity of the water-cooled core 1 for this purpose, but it is possible to change the cooling capacity of the water-cooled core 1 appropriately from the viewpoint of the overall cooling effect, and if the casting surface If it is desired to locate the solidification start point Pg somewhere in the intermediate portion of 1a, the cooling capacity may be controlled accordingly. Such solidification initiation points PI and P! According to the solidification start surface A formed according to the position of This solidified shell cannot act as a restraining shell until solidification begins, and only after solidification starts from the inner circumference side do both the inner and outer solidified shells act as a restraining shell. Therefore, the substantial sump depth is the depth indicated by the symbol H1, and the substantial sump depth H1, which causes cracking due to the solidification shrinkage described above, is extremely small.
従って割れを完全に防止することが可能となる。Therefore, it is possible to completely prevent cracking.
ここで、割れは材料の強度に関係し、またサンプ深さＨ
，およびサンプ最下点１５ａの位置は水冷鋳型１０およ
び水冷中子１のそれぞれの冷却能力、相対的な高さ位置
、中空ビレットの引き出し速度等によって変化する。従
ってこれらの選定に応じてそれぞれ許容できるサンプ深
さＨ，を得るようにすれば良いのである。このような許
容できるサンプ深さＨ，は同等な鋳造実験により求める
ことができ、或いは中実ビレットによる鋳造実験や適当
な強度計算等により推定できる。幾多の実験によれば、
サンプ深さＨｌが大体１００ｍｍを超えない程度とすれ
ば良いことが見出された。従って中空ビレットの外径お
よび肉厚が増大する場合にはＨが増大するが、実質的な
サンプ深さＨ３（第１図でＨ＋ ＝ Ｈ＋ ｈ −Ｈｚ
）が１００ｍｍを超えない程度にＨ２を調整すれば良
いことが判る。Here, the cracking is related to the strength of the material and the sump depth H
, and the position of the lowest point 15a of the sump vary depending on the respective cooling capacities of the water-cooled mold 10 and the water-cooled core 1, relative height positions, drawing speed of the hollow billet, etc. Therefore, it is only necessary to obtain an allowable sump depth H depending on these selections. Such an allowable sump depth H can be determined by equivalent casting experiments, or can be estimated by casting experiments using solid billets, appropriate strength calculations, etc. According to numerous experiments,
It has been found that the sump depth Hl should be approximately not more than 100 mm. Therefore, when the outer diameter and wall thickness of the hollow billet increase, H increases, but the effective sump depth H3 (H+ = H+ h - Hz in Figure 1)
It can be seen that it is sufficient to adjust H2 to such an extent that ) does not exceed 100 mm.
ここで、Ｈは溶湯１５の表面からサンプ最下点１５ａの
位置迄の高さ寸法、ｈは溶湯１５の表面から耐火断熱材
２の上面迄の高さ寸法、そしてＨｔは溶湯１５の表面か
ら凝固開始点Ｐ２迄の高さ寸法をそれぞれ示している。Here, H is the height dimension from the surface of the molten metal 15 to the position of the lowest point 15a of the sump, h is the height dimension from the surface of the molten metal 15 to the top surface of the refractory insulation material 2, and Ht is the height dimension from the surface of the molten metal 15 to the top surface of the refractory insulation material 2. The height dimension up to the solidification start point P2 is shown.
また、水冷中子１の鋳造面１ａは下方に位置されること
になるがその鋳込み方向の長さを長くする必要はなくな
るので、前述した発汗や溶湯漏れをも完全に防止できる
のである。Further, although the casting surface 1a of the water-cooled core 1 is positioned downward, it is not necessary to increase its length in the casting direction, so that the sweating and molten metal leakage mentioned above can be completely prevented.
１里鬼羞果
■ 本発明により肉厚の厚い中空ビレットの製造が可能
になる。1 りきしか■ The present invention makes it possible to manufacture thick-walled hollow billets.
■ 本発明による装置は構造が簡単で、冷却能力や引き
出し速度を特別に制御する必要はない。- The device according to the present invention has a simple structure, and there is no need to specially control the cooling capacity or drawing speed.
■ 発汗やメタル漏れの危険を完全に且つ容易に防止で
きる。■ The risk of sweating and metal leakage can be completely and easily prevented.
■ 既存の装置に容易に適用できる。■ Can be easily applied to existing equipment.
スｍ
水冷鋳型ｌＯとして内径１０２０ｍｍ、高さ８９ｍｍの
アルミニウム製の水冷鋳型を使用した。As the water-cooled mold IO, an aluminum water-cooled mold with an inner diameter of 1020 mm and a height of 89 mm was used.
水冷中子ｌとして、上部に外径３８０ｍｍで高さくＨｔ
）が５０ｍｍ、 １００ｍｍ、 １５０ｍｍ。As a water-cooled core l, the outer diameter is 380 mm and the height is Ht.
) is 50mm, 100mm, 150mm.
または２００ｍｍの寸法の耐火断熱材（ジョンマンビル
社製マリナイト）をそれぞれ有し、鋳造面１ａの上端外
径が３５７ｍｍで高さくＨ３）が４５ｍｍ、また該鋳造
面１ａが下方へ向けて先細の９″のテーパー面とされて
いる４種の水冷中子と、比較のために耐火断熱材が配備
されておらず、鋳造面の上端外径が３５７ ｍｍ、高さ
が８０ｍｍで下方へ向けて先細の９″のテーパー面とさ
れている１種の水冷中子との合計５種の水冷中子を使用
した。これらを第１図（耐火断熱材の無い場合は第２図
）に示すようにそれぞれ配置し、６０６１系ＡＩ合金を
鋳造材料とし、鋳造温度６８０〜６９０℃、冷却水量１
０００ｍ！／分（水冷鋳型）および３００１／分（水冷
中子）、そして中空ビレットの引き出し速度４５ｍｍ／
分、の条件のもとで連続鋳造を実施した。この結果を第
１表に示す。or a fireproof insulating material (Marinite manufactured by John Manville) with a dimension of 200 mm, the outer diameter of the upper end of the casting surface 1a is 357 mm, the height H3) is 45 mm, and the casting surface 1a is tapered downward. Four types of water-cooled cores have a 9" tapered surface, and for comparison, no refractory insulation material is provided, and the outer diameter of the upper end of the casting surface is 357 mm, the height is 80 mm, and the core is facing downward. A total of five types of water-cooled cores were used, including one type of water-cooled core with a tapered surface of 9''. These are arranged as shown in Figure 1 (Figure 2 if there is no fireproof insulation material), 6061 series AI alloy is used as the casting material, the casting temperature is 680-690℃, and the amount of cooling water is 1.
000m! /min (water-cooled mold) and 3001/min (water-cooled core), and hollow billet withdrawal speed 45mm/min.
Continuous casting was carried out under conditions of . The results are shown in Table 1.
第１表において、アルファベットは第１図に示した部分
の寸法を示している。In Table 1, letters indicate the dimensions of the portions shown in FIG.
この結果から、本発明により耐火断熱材を使用した場合
、特にこれによって実質的な溶湯のサンプ深さＨ，を大
体１００ｍｍ以下に抑えれば、割れの発生を防止でき、
内面の状態も良好となることが確認されたのである。こ
れに対し、従来法による耐火断熱材を使用しない、即ち
内周側の凝固開始点Ｐｔが強制的に低下されていない場
合には、溶湯のサンプ深さＨｌが１８０ｍｍとなって割
れが発生するとともに内面も不良であることが見られた
。From this result, when using the fireproof insulation material according to the present invention, it is possible to prevent the occurrence of cracks, especially if the actual molten metal sump depth H, is kept to approximately 100 mm or less.
It was confirmed that the condition of the inner surface was also improved. On the other hand, if the fireproof insulation material of the conventional method is not used, that is, if the solidification start point Pt on the inner peripheral side is not forcibly lowered, the sump depth Hl of the molten metal will be 180 mm and cracks will occur. It was also found that the inner surface was also defective.
ス１１１１
水冷鋳型１０として内径５１０ｍｍ、高さ８０ｍｍのア
ルミニウム類の水冷鋳型を使用した。S1111 As the water-cooled mold 10, an aluminum water-cooled mold with an inner diameter of 510 mm and a height of 80 mm was used.
水冷中子１として、上部に外径１３０ｍｍで高さくＨｚ
）が１５０ｍｍの寸法の耐火断熱材（ジッンマンビル
社製マリナイト）を有し、鋳造面１ａの上端外径力月１
０ｍｍで高さくＨｌ）が３０ｍｍ、また該鋳造面１ａが
下方へ向けて先細の７＠のテーパー面とされているアル
ミニウム類の水冷中子を使用した。これらを第１図に示
すようにそれぞれ配置し、５９５６系ＡＩ合金を鋳造材
料とし、鋳造温度６８０〜６９０℃、冷却水量５ＯＯｔ
ｙ分（水冷鋳型）および９０１／分（水冷中子）、そし
て中空ビレットの引き出し速度６０ｍｍＺ分、の条件の
もとで連続鋳造を実施した。As water-cooled core 1, the outer diameter is 130 mm and the height is Hz.
) has a fireproof insulation material (marinite manufactured by Zinman Building) with a dimension of 150 mm, and the outer diameter of the upper end of the casting surface 1a is 1.
A water-cooled aluminum core having a height (Hl) of 30 mm at 0 mm and a casting surface 1a having a downwardly tapered 7@ was used. These were arranged as shown in Figure 1, 5956 series AI alloy was used as the casting material, the casting temperature was 680-690°C, and the amount of cooling water was 5OOt.
Continuous casting was carried out under the following conditions: y min (water-cooled mold) and 901 min (water-cooled core), and a hollow billet withdrawal speed of 60 mm Z min.
この結果、実質的なサンプ深さは大体５０ｍｍとなり、
作られた中空とレットは内面に割れが無く、健全なもの
が得られることが確認された。As a result, the actual sump depth is approximately 50mm,
It was confirmed that the hollows and rets that were made had no cracks on their inner surfaces and were sound.
比較のため、外径１１０ｍｍ、高さ８０ｍｍの従来のア
ルミニウム類の水冷中子を第２図に示すように配置して
、同じ材料を同じ条件で連続鋳造した。これにより得ら
れた中空ビレットは内面に著しい凹凸が確認され、また
肉厚の中央付近から内周面へ至る割れが多数発生してい
るのが確認され、鋳造製品として実用に供し得るものと
は認められなかった。For comparison, a conventional aluminum water-cooled core with an outer diameter of 110 mm and a height of 80 mm was arranged as shown in FIG. 2, and the same material was continuously cast under the same conditions. The hollow billet thus obtained was confirmed to have significant unevenness on its inner surface, and many cracks extending from the center of the wall thickness to the inner circumferential surface were confirmed, making it difficult to find a product that could be put to practical use as a cast product. I was not able to admit.
第１図は本発明の方法を実施するための本発明による装
置の好ましい実施例を示す全体的な概略断面図。
第２図は従来の中空ビレットの連続鋳造装置の全体的な
概略断面図。
Ａ・・・・・・凝固開始面
Ｐ＋、Ｐｔ ・・凝固開始点
１・・・・・・水冷中子
１ａ・・・・・鋳造面
ｌｂ・・・・・冷却水の排出口
ｌｃ・・・・・冷却水の供給管
２・・・・・・耐火断熱材
１０・・・・・・水冷鋳型
１０ａ・・・・・鋳造面
１０ｂ・・・・・冷却水の排出口
１２・・・・・・受け台
１３．１４・・・冷却水
１５・・・・・・溶湯
１５° ・・・・・凝固部分
１６・・・・・・フロートFIG. 1 is an overall schematic sectional view of a preferred embodiment of the apparatus according to the invention for carrying out the method of the invention. FIG. 2 is an overall schematic sectional view of a conventional continuous casting apparatus for hollow billets. A...Solidification start surface P+, Pt...Solidification start point 1...Water-cooled core 1a...Casting surface lb...Cooling water outlet lc... ... Cooling water supply pipe 2 ... Fireproof insulation material 10 ... Water-cooled mold 10a ... Casting surface 10b ... Cooling water outlet 12 ... ...Scraper 13.14 ...Cooling water 15 ... Molten metal 15° ... Solidification part 16 ... Float
Claims (5)
属製の水冷中子を配備し、前記水冷鋳型と水冷中子との
間に形成された空間部に熱溶融された材料を供給すると
ともに、当初は前記空間部の底部を閉鎖している受け台
を、供給された前記材料が凝固を開始する位置（凝固開
始点）を前記空間部内に維持させる状態で降下させ、こ
れによって前記空間部内で凝固された中空ビレットを連
続的に引き出して製造する方法であって、 前記水冷中子における前記材料の冷却開始点を前記水冷
鋳型における冷却開始点よりも相対的に低下させ、該凝
固開始点と凝固開始面における最下点との間の実質的な
サンプ深さを、鋳造条件に応じて定められ得る製品の割
れが生じない許容深さ以下に調整する、 ことを特徴とする厚肉中空ビレットの製造方法。(1) A metal water-cooled core is placed in the center of a metal water-cooled mold with open top and bottom, and the thermally fused material is placed in the space formed between the water-cooled mold and the water-cooled core. At the same time as supplying the material, the pedestal that initially closes the bottom of the space is lowered in a state where the position where the supplied material starts solidifying (solidification start point) is maintained within the space, thereby A method of manufacturing by continuously drawing out a hollow billet solidified within the space, the method comprising: lowering a cooling start point of the material in the water-cooled core relatively than a cooling start point of the material in the water-cooling mold; The actual sump depth between the solidification start point and the lowest point on the solidification start surface is adjusted to be below a permissible depth that does not cause cracking of the product, which can be determined according to casting conditions. A method for manufacturing thick-walled hollow billets.
することを特徴とする特許請求の範囲第１項記載の厚肉
中空ビレットの製造方法。(2) The method for manufacturing a thick-walled hollow billet according to claim 1, characterized in that the substantial sump depth is adjusted to within 100 mm.
覆い、この範囲で凝固が開始しないようにしたことを特
徴とする特許請求の範囲第１項記載の厚肉中空ビレット
の製造方法。(3) Production of a thick-walled hollow billet according to claim 1, characterized in that the upper range of the casting surface of the water-cooled core is covered with a fireproof heat insulating material to prevent solidification from starting in this range. Method.
属製の水冷中子を配備し、前記水冷鋳型と水冷中子との
間に形成された空間部に熱溶融された材料を供給すると
ともに、当初は前記空間部の底部を閉鎖している受け台
を、供給された前記材料が凝固を開始する位置（凝固開
始点）を前記空間部内に維持させる状態で降下させ、こ
れによって前記空間部内で凝固した中空ビレットを連続
的に引き出して製造する装置において、 前記水冷中子における凝固開始点を実質的に低下させる
ために、該水冷中子の鋳造面の上側部分に耐火断熱材が
配備されている、 ことを特徴とする厚肉中空ビレットの製造装置。(4) A metal water-cooled core is placed in the center of a metal water-cooled mold with open top and bottom, and the thermally fused material is placed in the space formed between the water-cooled mold and the water-cooled core. At the same time as supplying the material, the pedestal that initially closes the bottom of the space is lowered in a state where the position where the supplied material starts solidifying (solidification start point) is maintained within the space, thereby In an apparatus for manufacturing by continuously drawing out a hollow billet solidified in the space, a refractory heat insulating material is provided on the upper part of the casting surface of the water-cooled core in order to substantially lower the solidification start point in the water-cooled core. A thick-walled hollow billet manufacturing device characterized by:
間部内へ張り出していることを特徴とする特許請求の範
囲第４項記載の厚肉中空ビレットの製造装置。(5) The apparatus for manufacturing a thick-walled hollow billet according to claim 4, wherein the refractory heat insulating material protrudes into the space beyond the casting surface of the water-cooled core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5204985A JPS61212448A (en) | 1985-03-15 | 1985-03-15 | Method and apparatus for producing thick-walled hollow billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5204985A JPS61212448A (en) | 1985-03-15 | 1985-03-15 | Method and apparatus for producing thick-walled hollow billet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61212448A true JPS61212448A (en) | 1986-09-20 |
| JPH0513023B2 JPH0513023B2 (en) | 1993-02-19 |
Family
ID=12903956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5204985A Granted JPS61212448A (en) | 1985-03-15 | 1985-03-15 | Method and apparatus for producing thick-walled hollow billet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61212448A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6430577A (en) * | 1987-07-02 | 1989-02-01 | Eastman Kodak Co | Apparatus for sensing mass in tank |
-
1985
- 1985-03-15 JP JP5204985A patent/JPS61212448A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6430577A (en) * | 1987-07-02 | 1989-02-01 | Eastman Kodak Co | Apparatus for sensing mass in tank |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0513023B2 (en) | 1993-02-19 |
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