JP2002153948A - Width changeable mold for continuous casting - Google Patents
Width changeable mold for continuous castingInfo
- Publication number
- JP2002153948A JP2002153948A JP2000354275A JP2000354275A JP2002153948A JP 2002153948 A JP2002153948 A JP 2002153948A JP 2000354275 A JP2000354275 A JP 2000354275A JP 2000354275 A JP2000354275 A JP 2000354275A JP 2002153948 A JP2002153948 A JP 2002153948A
- Authority
- JP
- Japan
- Prior art keywords
- side copper
- copper plate
- mold
- short side
- long side
- 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
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- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋼の連続鋳造用幅
可変鋳型に関するもので、特に、連続鋳造中に鋳型短辺
を移動させて鋳片幅を変更しても、長辺銅板の表面及び
短辺銅板の摺動面に鋳片幅変更に伴う疵発生が少ない連
続鋳造用幅可変鋳型に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable width mold for continuous casting of steel, and more particularly, to a method of changing the width of a slab by moving the short side of the mold during continuous casting, and changing the surface of a long side copper plate. The present invention also relates to a variable width casting mold for continuous casting, in which the sliding surface of a short side copper plate has few flaws due to a change in slab width.
【０００２】[0002]
【従来の技術】鋼の連続鋳造では、生産性向上のために
鋳造中に鋳片幅を変更しつつ、多数のヒートを連続連続
鋳造（「連々鋳」ともいう）する方法が広く行われてい
る。図８は、連続鋳造中に鋳片幅を変更することができ
る従来の連続鋳造用幅可変鋳型の１例を示す斜視図であ
る。2. Description of the Related Art In continuous casting of steel, a method of continuously casting a large number of heats (also referred to as "continuous casting") while changing a slab width during casting to improve productivity is widely used. I have. FIG. 8 is a perspective view showing an example of a conventional continuous casting variable width mold capable of changing the slab width during continuous casting.
【０００３】図８に示すように、幅可変鋳型１は、一対
の鋳型長辺２と、この鋳型長辺２に挟持され、鋳型長辺
２間を摺動可能な鋳型短辺５とから構成されている。鋳
型長辺２は、長辺銅板３と長辺バックアップフレーム４
とからなり、又、鋳型短辺５は、短辺銅板６と短辺バッ
クアップフレーム７とからなっている。そして、片側の
鋳型長辺２にはクランプ力調整装置８が設置されてお
り、このクランプ力調整装置８によって鋳型長辺２によ
る鋳型短辺５の挟持力が制御されている。鋳型短辺５の
背面には原動機９が設置されており、原動機９を作動さ
せることで鋳型短辺５は鋳型長辺２内を横方向に移動
し、鋳片幅を自在に変更できるようになっている。As shown in FIG. 8, a variable width mold 1 comprises a pair of long sides 2 of a mold and a short side 5 of a mold which is sandwiched between the long sides 2 of the mold and slidable between the long sides 2 of the mold. Have been. The mold long side 2 is composed of a long side copper plate 3 and a long side backup frame 4
The short side 5 of the mold is composed of a short side copper plate 6 and a short side backup frame 7. A clamping force adjusting device 8 is provided on one of the mold long sides 2, and the clamping force adjusting device 8 controls the clamping force of the mold short side 5 by the mold long side 2. A prime mover 9 is installed on the back side of the mold short side 5. By operating the prime mover 9, the mold short side 5 moves in the mold long side 2 in the lateral direction, so that the slab width can be freely changed. Has become.
【０００４】クランプ力調整装置８による挟持力は、連
続鋳造中、幅可変鋳型１内の溶鋼静圧により鋳型長辺２
と鋳型短辺５との間に隙間が生じないよう、鋳型長辺２
に作用する溶鋼静圧力より大きくなるように制御されて
いる。又、鋳造中の鋳片幅変更の際にも、同様に鋳型長
辺２と鋳型短辺５との間に隙間が生じないように制御さ
れている。即ち、長辺銅板３と短辺銅板６との接触面に
は、前記挟持力と溶鋼静圧の差に相当する押し付け力が
常時作用している。従って、鋳片幅を変更するために鋳
造中に鋳型短辺５を移動させると、短辺銅板６の長辺銅
板３との接触面、即ち、本発明で称する摺動面１０に
は、摩擦力が生じることになる。During the continuous casting, the clamping force of the clamping force adjusting device 8 is controlled by the static pressure of the molten steel in the width-variable mold 1 and the mold long side 2
Mold long side 2 so that no gap is formed between
Is controlled so as to be larger than the molten steel static pressure acting on the molten steel. Also, when the slab width is changed during casting, control is similarly performed so that no gap is formed between the long side 2 of the mold and the short side 5 of the mold. That is, a pressing force corresponding to the difference between the clamping force and the molten steel static pressure always acts on the contact surface between the long side copper plate 3 and the short side copper plate 6. Therefore, when the short side 5 of the mold is moved during casting in order to change the width of the slab, the contact surface between the short side copper plate 6 and the long side copper plate 3, that is, the sliding surface 10 referred to in the present invention, has friction. Power will be created.
【０００５】摺動面１０に一旦異物が噛み込まれると、
この摩擦力のために異物を起点として長辺銅板３の母材
を巻き込み、噛み込み物は雪だるま式に巨大化する。そ
の結果、長辺銅板３の表面及び短辺銅板６の摺動面１０
に、鋳型短辺５の移動方向に沿った疵が発生する。深い
疵が発生した場合には、疵により形成される間隙に地金
が差し込み、ブレークアウト等の操業異常を発生させ
る。そのため、深い疵が発生した場合には、鋳型を交換
する必要が生じ、生産性の悪化や鋳型コストの上昇を招
くことになる。[0005] Once foreign matter is caught in the sliding surface 10,
Due to this frictional force, the base material of the long side copper plate 3 is entangled with the foreign material as a starting point, and the bite becomes large like a snowball. As a result, the surface of the long side copper plate 3 and the sliding surface 10 of the short side copper plate 6
Then, a flaw occurs along the moving direction of the short side 5 of the mold. When a deep flaw occurs, a metal is inserted into a gap formed by the flaw, thereby causing an operation abnormality such as a breakout. Therefore, when a deep flaw occurs, it is necessary to replace the mold, which leads to a decrease in productivity and an increase in mold cost.
【０００６】この問題を解決する手段として、特開昭６
３−２５３６号公報が開示されている。同号公報によれ
ば、短辺銅板の摺動面に凹溝を設け、この凹溝内に摺動
面より突出する耐熱性緩衝材を充填しているので、この
緩衝材により摺動面に発生する異常に高い、局部的な接
触圧力を軽減することが可能となり、鋳造中の鋳片幅変
更に伴う長辺銅板及び短辺銅板の疵発生を未然に防止す
ることができるとしている。As means for solving this problem, Japanese Unexamined Patent Publication No.
No. 3-2536 is disclosed. According to the publication, a concave groove is provided on the sliding surface of the short side copper plate, and a heat resistant buffer material protruding from the sliding surface is filled in the concave groove. It is described that abnormally high local contact pressure that occurs can be reduced, and the occurrence of flaws on the long-side copper plate and the short-side copper plate due to the change of the slab width during casting can be prevented.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、特開昭
６３−２５３６号公報に開示された手段では、摩擦力に
起因する接触圧力は削減可能であるが、突出させて充填
した緩衝材により、長辺銅板の表面と短辺銅板の摺動面
との間の間隙は広がる傾向にあり、却ってスプラッシュ
等の異物を噛み込む頻度が高くなり、異物噛み込みによ
る疵発生は防止することができないという問題点があ
る。However, according to the means disclosed in Japanese Patent Application Laid-Open No. 63-2536, the contact pressure caused by the frictional force can be reduced, but the contact pressure caused by the protrusion and filling is long. The gap between the surface of the copper plate on the side and the sliding surface of the copper plate on the short side tends to be widened, and the frequency of biting foreign substances such as splash is rather high, and the generation of scratches due to the biting of foreign substances cannot be prevented. There is a point.
【０００８】本発明は上記事情に鑑みなされたもので、
その目的とするところは、連続鋳造中に鋳型短辺を移動
させて鋳片幅を変更しても、長辺銅板の表面及び短辺銅
板の摺動面に鋳片幅変更に伴う疵発生を抑制することが
できる連続鋳造用幅可変鋳型を提供することである。[0008] The present invention has been made in view of the above circumstances,
The purpose is to change the slab width by moving the short side of the mold during continuous casting, and even if the slab width is changed, scratches due to the slab width change on the surface of the long side copper plate and the sliding surface of the short side copper plate. An object of the present invention is to provide a variable width mold for continuous casting that can be suppressed.
【０００９】[0009]
【課題を解決するための手段】本発明者等は、上記課題
を解決するために調査・検討を実施した。先ず、短辺銅
板の摺動面と長辺銅板との間に異物が噛み込まれる状況
を調査した。Means for Solving the Problems The present inventors have conducted investigations and studies to solve the above problems. First, the situation in which foreign matter was caught between the sliding surface of the short side copper plate and the long side copper plate was investigated.
【００１０】図１は、１ヒートが２５０トンの溶鋼を１
０５０ヒート鋳造した後の短辺銅板幅寸法の測定結果で
ある。図１から明らかなように、メニスカス近傍の幅方
向変形が大きく、設計寸法に対して０．５ｍｍ以上収縮
していることが分かる。これは、鋳造中及び非鋳造中の
熱履歴により短辺銅板は膨張−収縮を繰り返しており、
最も高温となるメニスカス近傍で膨張−収縮による熱変
形が大きくなるためである。FIG. 1 shows that one heat is equivalent to 250 tons of molten steel.
It is a measurement result of the short side copper plate width dimension after 050 heat casting. As is clear from FIG. 1, the deformation in the width direction in the vicinity of the meniscus is large, and is shrunk by 0.5 mm or more with respect to the design dimension. This is because the short side copper plate repeatedly expands and contracts due to the thermal history during casting and non-casting,
This is because thermal deformation due to expansion and contraction increases near the meniscus where the temperature is highest.
【００１１】鋳片幅変更時の異物の噛み込みによる疵発
生はメニスカス〜メニスカス下２００ｍｍ位置までのメ
ニスカス近傍が最も多いことと、上記の短辺銅板の変形
状態とを照らし合わせ、鋳片幅変更に伴う疵発生のメカ
ニズムは次のように考えられる。即ち、例えば鋳型への
溶鋼注入開始時に発生するスプラッシュ等が短辺銅板の
幅変形により生成する長辺銅板との間隙に侵入して、異
物噛み込みが発生し、短辺銅板の移動に伴い、この異物
により長辺銅板の表面及び短辺銅板の摺動面に疵（以下
「幅変更疵」と称す）が発生すると考えられる。When the slab width is changed, the flaws generated due to foreign matter being caught are the largest in the vicinity of the meniscus from the meniscus to the position 200 mm below the meniscus, and the deformed state of the short side copper plate is compared. The mechanism of the generation of flaws associated with is considered as follows. That is, for example, a splash or the like generated at the start of molten steel injection into the mold enters a gap between the long side copper plate generated by the width deformation of the short side copper plate, foreign matter bite occurs, and with the movement of the short side copper plate, It is considered that this foreign matter causes flaws (hereinafter referred to as “width change flaws”) on the surface of the long side copper plate and the sliding surface of the short side copper plate.
【００１２】短辺銅板摺動面の幅変更疵の形態を詳細に
調査した結果、図２に示すように、噛み込まれた異物を
起点Ｐとして摺動面１０に幅変更疵Ｑが発生し、幅変更
疵Ｑは、短辺銅板６の移動方向の反対側に向かってその
幅が拡大し且つその深さが増大していることが分かっ
た。そして、異物が短辺銅板６を通り抜けるまで幅変更
疵Ｑが形成されることが分かった。尚、図２は、短辺銅
板６の摺動面１０における幅変更疵Ｑを模式的に示す図
であり、図中の矢印は短辺銅板６の移動方向を示してい
る。As a result of a detailed examination of the form of width change flaws on the short side copper plate sliding surface, as shown in FIG. The width change flaw Q was found to increase in width and depth in the direction opposite to the moving direction of the short side copper plate 6. Then, it was found that the width change flaw Q was formed until the foreign matter passed through the short side copper plate 6. FIG. 2 is a diagram schematically showing the width change flaw Q on the sliding surface 10 of the short side copper plate 6, and the arrow in the figure indicates the moving direction of the short side copper plate 6.
【００１３】一方、長辺銅板表面における幅変更疵は、
噛み込まれた異物を起点として、短辺銅板の移動方向に
向かって疵幅が拡大し且つ疵深さが増大しており、そし
て、異物が短辺銅板を通り抜けた時点で、この異物によ
る幅変更疵が途絶えることが分かった。On the other hand, the width change flaw on the long side copper plate surface is as follows.
The flaw width increases and the flaw depth increases in the direction of movement of the short-side copper plate from the bite of the foreign material as a starting point, and when the foreign material passes through the short-side copper plate, the width of the foreign material increases. It turned out that the change flaw was discontinued.
【００１４】これらの観察結果から、噛み込まれた異物
は、短辺銅板の移動速度よりも遅い速度で短辺銅板に追
従して移動しつつ、幅変更疵を雪だるま式に拡大し、そ
して、その後の短辺銅板の移動に伴い、異物が短辺銅板
の移動方向の反対側に排出された時点で、幅変更疵が途
絶えることが分かった。即ち、異物の移動する距離が短
ければ、幅変更疵が拡大する前に異物が摺動面から排出
されて、幅変更疵は軽微になるとの知見を得た。From these observation results, the caught foreign matter moves at a speed lower than the moving speed of the short-side copper plate and follows the short-side copper plate while expanding the width-change flaw in a snowball manner. It was found that the width change flaw was discontinued when the foreign matter was discharged to the opposite side in the direction of movement of the short side copper plate with the subsequent movement of the short side copper plate. That is, it has been found that if the moving distance of the foreign matter is short, the foreign matter is discharged from the sliding surface before the width change flaw expands, and the width change flaw becomes small.
【００１５】そこで、短辺銅板の厚み、即ち短辺銅板の
摺動面と長辺銅板との接触長さを変更したモデル実験を
実施し、この接触長さと長辺銅板表面における幅変更疵
との関係を調査した。図３に調査結果を示す。図３から
明らかなように、長辺銅板との接触長さを短くすること
で、異物の移動距離は短くなり、幅変更疵が拡大する前
に異物が摺動面から排出され、幅変更疵の深さは浅くな
るとの知見を得た。Therefore, a model experiment was performed in which the thickness of the short side copper plate, that is, the contact length between the sliding surface of the short side copper plate and the long side copper plate was changed, and the contact length and the width change flaw on the surface of the long side copper plate were changed. The relationship was investigated. FIG. 3 shows the results of the investigation. As is clear from FIG. 3, by shortening the contact length with the long side copper plate, the moving distance of the foreign matter is shortened, the foreign matter is discharged from the sliding surface before the width change flaw is enlarged, and the width change flaw is reduced. Was found to be shallower.
【００１６】本発明は、この知見に基づきなされたもの
で、第１の発明による連続鋳造用幅可変鋳型は、相対す
る一対の長辺銅板と、この長辺銅板に挟持され、長辺銅
板内を移動可能な一対の短辺銅板とを具備した連続鋳造
用幅可変鋳型において、短辺銅板の摺動面と長辺銅板と
の接触面の厚みが１０〜２５ｍｍであることを特徴とす
るものである。The present invention has been made based on this finding. The variable width mold for continuous casting according to the first invention is provided with a pair of opposing long-side copper plates and sandwiched between the long-side copper plates. In the variable width mold for continuous casting comprising a pair of short side copper plates capable of moving the copper plate, the thickness of the contact surface between the sliding surface of the short side copper plate and the long side copper plate is 10 to 25 mm. It is.
【００１７】又、第２の発明による連続鋳造用幅可変鋳
型は、相対する一対の長辺銅板と、この長辺銅板に挟持
され、長辺銅板内を移動可能な一対の短辺銅板とを具備
した連続鋳造用幅可変鋳型において、短辺銅板の摺動面
中央部に鋳造方向に延びる凹溝を設け、当該摺動面と長
辺銅板との接触面の厚みが前記凹溝の両側で各々３〜２
５ｍｍとなることを特徴とするものである。Further, the variable width mold for continuous casting according to the second invention comprises a pair of opposed long side copper plates and a pair of short side copper plates sandwiched between the long side copper plates and movable in the long side copper plate. In the continuous casting variable width mold provided, a concave groove extending in the casting direction is provided in the center of the sliding surface of the short side copper plate, and the thickness of the contact surface between the sliding surface and the long side copper plate is on both sides of the concave groove. 3-2 each
5 mm.
【００１８】短辺銅板には、短辺銅板を冷却するための
冷却水を通す溝（スリット）や孔（カナール）が設けら
れるため、通常３０ｍｍ以上の厚みが必要である。そこ
で、第１の発明では、冷却水を通すための溝及び孔が設
置される部分の短辺銅板の厚みは通常通りの厚みを確保
しつつ、短辺銅板の摺動面に段差を設ける、或いは摺動
面を斜めに切断加工する等の加工を施し、短辺銅板の摺
動面と長辺銅板との接触面の厚みを１０〜２５ｍｍとす
る。又、第２の発明では、短辺銅板の摺動面中央部に鋳
造方向に延びる凹溝を設置して、凹溝の両側の摺動面と
長辺銅板との接触面の厚みを各々３〜２５ｍｍとする。The short side copper plate is provided with a groove (slit) or a hole (canal) through which cooling water for cooling the short side copper plate is provided, and therefore, usually requires a thickness of 30 mm or more. Therefore, in the first invention, the thickness of the short-side copper plate at the portion where the groove and the hole for passing the cooling water are installed is assured as usual, and a step is provided on the sliding surface of the short-side copper plate, Alternatively, processing such as cutting the sliding surface obliquely or the like is performed, and the thickness of the contact surface between the sliding surface of the short side copper plate and the long side copper plate is set to 10 to 25 mm. In the second invention, a groove extending in the casting direction is provided at the center of the sliding surface of the short-side copper plate, and the thickness of the contact surface between the sliding surface on both sides of the groove and the long-side copper plate is set to 3 each. ２５25 mm.
【００１９】このように、本発明では摺動面と長辺銅板
との接触面の厚みを２５ｍｍ以下としているので、仮に
異物が巻き込まれて幅変更疵が発生したとしても、幅変
更疵が拡大する前に、異物が摺動面から排出されるの
で、幅変更疵の拡大化を抑制することができる。As described above, in the present invention, the thickness of the contact surface between the sliding surface and the long side copper plate is set to 25 mm or less. Therefore, even if foreign matter is involved and a width change flaw occurs, the width change flaw is enlarged. Before the cleaning, the foreign matter is discharged from the sliding surface, so that it is possible to suppress an increase in the width change flaw.
【００２０】幅変更疵の深さが１．０ｍｍを越えると、
ブレークアウト等の操業上のトラブルにつながるため、
幅可変鋳型として使用できなくなる。前述の図３に示す
モデル実験の結果から、短辺銅板と長辺銅板との接触長
さが２５ｍｍを越えると、幅変更疵の深さが１．０ｍｍ
を越えることが分かったので、本発明では摺動面と長辺
銅板との接触面厚みの最大値を２５ｍｍに限定した。When the depth of the width change flaw exceeds 1.0 mm,
To lead to operational problems such as breakouts,
It cannot be used as a variable width mold. From the results of the model experiment shown in FIG. 3 described above, when the contact length between the short side copper plate and the long side copper plate exceeds 25 mm, the depth of the width change flaw is 1.0 mm.
Therefore, in the present invention, the maximum value of the contact surface thickness between the sliding surface and the long side copper plate is limited to 25 mm.
【００２１】一方、接触面厚みが薄くなり過ぎると、鋳
型としての強度が確保できなくなる等の問題が生ずる。
そこで、第１の発明では、短辺銅板の設置上の問題も考
慮して最小厚みを１０ｍｍに限定した。１０ｍｍ未満の
場合には、鋳型に組み合わせた時に短辺銅板と長辺銅板
との直角度を確保しにくくなる。第２の発明では直角度
の問題はないが、溶鋼からの熱による変形を避けるため
に最小厚みを３ｍｍに限定した。On the other hand, if the thickness of the contact surface is too small, there arises a problem that the strength as a mold cannot be secured.
Therefore, in the first invention, the minimum thickness is limited to 10 mm in consideration of the problem of installation of the short side copper plate. When it is less than 10 mm, it is difficult to secure a perpendicularity between the short side copper plate and the long side copper plate when combined with the mold. In the second invention, there is no problem of the perpendicularity, but the minimum thickness is limited to 3 mm to avoid deformation due to heat from the molten steel.
【００２２】[0022]
【発明の実施の形態】以下、本発明の実施の形態を添付
図面を参照して説明する。図４は、本発明による幅可変
鋳型の実施の形態の１例を示す斜視図、図５は、短辺銅
板と長辺銅板との接触状態を示す概略平面図である。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 4 is a perspective view showing an example of an embodiment of a variable width mold according to the present invention, and FIG. 5 is a schematic plan view showing a contact state between a short side copper plate and a long side copper plate.
【００２３】図４に示すように、連続鋳造中に鋳片幅を
変更することができる幅可変鋳型１は、相対する一対の
鋳型長辺２と、相対する鋳型長辺２に挟持され、鋳型長
辺２間を摺動可能な鋳型短辺５とから構成されている。
鋳型長辺２は、長辺銅板３と長辺バックアップフレーム
４とからなり、又、鋳型短辺５は、短辺銅板６と短辺バ
ックアップフレーム７とからなっている。長辺銅板３及
び短辺銅板６には、冷却水を通すための溝（図示せず）
又は孔（図示せず）が設けられており、長辺バックアッ
プフレーム４及び短辺バックアップフレーム７には、冷
却水を供給するための水箱（図示せず）が設置されてい
る。As shown in FIG. 4, a variable width mold 1 capable of changing the slab width during continuous casting is sandwiched between a pair of opposed mold long sides 2 and the opposed mold long sides 2, and the mold And a mold short side 5 slidable between the long sides 2.
The mold long side 2 includes a long side copper plate 3 and a long side backup frame 4, and the mold short side 5 includes a short side copper plate 6 and a short side backup frame 7. Grooves (not shown) for passing cooling water in the long side copper plate 3 and the short side copper plate 6
Alternatively, a hole (not shown) is provided, and a water box (not shown) for supplying cooling water is installed in the long side backup frame 4 and the short side backup frame 7.
【００２４】片側の鋳型長辺２にはクランプ力調整装置
８が設置されており、このクランプ力調整装置８によっ
て鋳型長辺２による鋳型短辺５の挟持力が制御されてい
る。又、鋳型短辺５の背面には、電動モーターや油圧モ
ーター等の原動機９が設置されており、この原動機９を
作動させることで鋳型短辺５は鋳型長辺２内を横方向に
移動し、鋳片幅を自在に変更できるようになっている。A clamping force adjusting device 8 is provided on one long side 2 of the mold, and the clamping force adjusting device 8 controls the clamping force of the short side 5 of the mold by the long side 2 of the mold. A motor 9 such as an electric motor or a hydraulic motor is provided on the back side of the mold short side 5. By operating the motor 9, the mold short side 5 moves in the mold long side 2 in the lateral direction. The slab width can be freely changed.
【００２５】クランプ力調整装置８による挟持力は、鋳
造中、幅可変鋳型１内の溶鋼静圧により鋳型長辺２と鋳
型短辺５との間に隙間が生じないよう、鋳型長辺２に作
用する溶鋼静圧力より大きくなるように制御されてお
り、又、同様に、鋳造中の鋳片幅変更の際にも、鋳型長
辺２と鋳型短辺５との間に隙間が生じないように制御さ
れている。The clamping force by the clamp force adjusting device 8 is applied to the long side 2 of the mold so that no gap is formed between the long side 2 and the short side 5 of the mold due to the static pressure of the molten steel in the variable width mold 1 during casting. It is controlled so as to be larger than the acting molten steel static pressure. Similarly, when the slab width is changed during casting, no gap is formed between the mold long side 2 and the mold short side 5. Is controlled.
【００２６】短辺銅板６には、その摺動面１０の中央部
に鋳造方向に延びる凹溝１１が設置されており、短辺銅
板６と長辺銅板３との接触状態を図５に示す。図５にお
いて、摺動面１０と長辺銅板３との接触面厚み（ａ）及
び接触面厚み（ｂ）が各々３〜２５ｍｍとなるように、
凹溝１１は摺動面１０の中央部に設置されている。尚、
接触面厚み（ａ）と接触面厚み（ｂ）とを同一にする必
要はない。The short side copper plate 6 is provided with a concave groove 11 extending in the casting direction at the center of the sliding surface 10, and the contact state between the short side copper plate 6 and the long side copper plate 3 is shown in FIG. . In FIG. 5, the contact surface thickness (a) and the contact surface thickness (b) between the sliding surface 10 and the long side copper plate 3 are each 3 to 25 mm.
The concave groove 11 is provided at the center of the sliding surface 10. still,
It is not necessary that the contact surface thickness (a) and the contact surface thickness (b) be the same.
【００２７】図６及び図７は、短辺銅板６の他の実施の
形態を示す図で、短辺銅板６と長辺銅板３との接触状態
を示す概略平面図である。図６は、溶鋼と接触しない側
の摺動面１０に段差を設けて、摺動面１０と長辺銅板３
との接触面厚み（ｃ）を狭くした例を示す図で、図７
は、溶鋼と接触しない側の摺動面１０を斜めに切断し
て、摺動面１０と長辺銅板３との接触面厚み（ｃ）を狭
くした例を示す図で、図６及び図７において、摺動面１
０と長辺銅板３との接触面厚み（ｃ）は１０〜２５ｍｍ
の範囲に調整されている。FIGS. 6 and 7 are views showing another embodiment of the short side copper plate 6, and are schematic plan views showing the contact state between the short side copper plate 6 and the long side copper plate 3. FIG. FIG. 6 shows that the sliding surface 10 on the side not in contact with the molten steel is provided with a step so that the sliding surface 10 and the long side copper plate 3
FIG. 7 is a diagram showing an example in which the contact surface thickness (c) with the contact is reduced.
FIGS. 6 and 7 show an example in which the sliding surface 10 on the side not in contact with the molten steel is cut obliquely to reduce the contact surface thickness (c) between the sliding surface 10 and the long side copper plate 3. In the sliding surface 1
0 and the contact surface thickness (c) between the long side copper plate 3 is 10 to 25 mm
The range has been adjusted.
【００２８】このような幅可変鋳型１を用いることで、
鋳片幅変更の際に鋳型長辺２と鋳型短辺５との間に隙間
が生じないように、クランプ力調整装置８により鋳型短
辺５に挟持力が作用していても、仮に異物が摺動面１０
に噛み込んだとしても、長辺銅板３の表面及び短辺銅板
６の摺動面１０において、深く且つ長い形状の幅変更疵
の発生を抑制することができる。By using such a variable width mold 1,
Even if a clamping force is applied to the short side 5 of the mold by the clamping force adjusting device 8 so that no gap is formed between the long side 2 of the mold and the short side 5 of the mold when the width of the slab is changed, foreign matter may be temporarily generated. Sliding surface 10
Even on the surface of the long-side copper plate 3 and the sliding surface 10 of the short-side copper plate 6, the occurrence of deep and long width change flaws can be suppressed.
【００２９】尚、上記説明では、摺動面１０と長辺銅板
３との接触面厚み（ｃ）を１０〜２５ｍｍとするため
に、摺動面１０に段差を設けた例と、摺動面１０を斜め
に切断した例とを説明したが、本発明はこれらに限るわ
けではなく、摺動面１０と長辺銅板３との接触面厚み
（ｃ）が１０〜２５ｍｍであるならば、短辺銅板６をど
のような形状にしても良い。又、幅可変鋳型１の全体構
造も上記に限るわけではなく、鋳造中に鋳片幅を変更す
ることができる幅可変鋳型であれば、どのような構造で
あっても良い。In the above description, in order to make the contact surface thickness (c) between the sliding surface 10 and the long side copper plate 3 10 to 25 mm, an example in which a step is provided on the sliding surface 10 is described. Although an example in which the sliding surface 10 is cut obliquely has been described, the present invention is not limited to these. If the contact surface thickness (c) between the sliding surface 10 and the long-side copper plate 3 is 10 to 25 mm, a short cut is possible. The side copper plate 6 may have any shape. Also, the overall structure of the variable width mold 1 is not limited to the above, and any structure may be used as long as the width of the slab can be changed during casting.
【００３０】[0030]
【実施例】鋳片厚みが２５０ｍｍ、鋳片幅が７５０〜１
７００ｍｍの鋳片を鋳造する湾曲型のスラブ連続鋳造機
の幅可変鋳型において、図５及び図６に示す形状の短辺
銅板を適用した。図５に示す形状の短辺銅板（試験Ｎo.
１）では、接触面厚み（ａ）及び接触面厚み（ｂ）をと
もに５ｍｍとし、凹溝の深さを５ｍｍとした。又、図６
に示す形状の短辺銅板（試験Ｎo.２）では接触面厚み
（ｃ）を１５ｍｍとした。鋳造した鋼種はＡｌキルド鋼
であり、平均連々鋳長さは５．０ヒートで、この間平均
５．５回の鋳造中幅変更を実施した。尚、通常部の短辺
銅板の厚みは４８ｍｍである。EXAMPLE The slab thickness was 250 mm and the slab width was 750-1.
In a variable width mold of a curved slab continuous caster for casting a 700 mm slab, a short side copper plate having a shape shown in FIGS. 5 and 6 was applied. A short side copper plate having the shape shown in FIG. 5 (test No.
In 1), both the contact surface thickness (a) and the contact surface thickness (b) were 5 mm, and the depth of the concave groove was 5 mm. FIG.
In the short side copper plate (test No. 2) having the shape shown in FIG. The cast steel type was an Al-killed steel, and the average continuous casting length was 5.0 heats, during which the width change during casting was performed 5.5 times on average. In addition, the thickness of the short side copper plate of a normal part is 48 mm.
【００３１】試験Ｎo.１及び試験Ｎo.２ともに、使用中
に長辺銅板に深い幅変更疵が発生せず、試験Ｎo.１は２
０６０ヒート、試験Ｎo.２は２０７５ヒートを鋳造した
後、短辺銅板の幅収縮により定期交換した。その時の長
辺銅板及び短辺銅板摺動面における幅変更疵の最大深さ
は試験Ｎo.１及び試験Ｎo.２ともに０．２ｍｍであっ
た。同時期に比較のために用いた定常品の短辺銅板で
は、２５７ヒートを鋳造した時点で深さ１．６ｍｍの幅
変更疵が長辺銅板に発生し、鋳型交換を余儀なくされ
た。In both Test No. 1 and Test No. 2, no deep width change flaw was generated on the long side copper plate during use.
060 heat, test No. 2 was periodically exchanged by casting 2075 heat and then shrinking the width of the short side copper plate. At that time, the maximum depth of the width change flaw on the sliding surface of the long side copper plate and the short side copper plate was 0.2 mm in both test No. 1 and test No. 2. At the same time, in the short-side copper plate of the regular product used for comparison, a 1.6 mm deep width change flaw occurred on the long-side copper plate at the time of casting 257 heat, and the mold had to be replaced.
【００３２】[0032]
【発明の効果】本発明による連続鋳造用幅可変鋳型によ
れば、連続鋳造中に鋳型短辺を移動させて鋳片幅を変更
しても、幅変更疵の発生を抑制して長期間使用すること
ができ、その結果、安定操業及び製造コストの削減が達
成され、工業上有益な効果がもたらされる。According to the variable width casting mold for continuous casting of the present invention, even if the width of the slab is changed by moving the short side of the casting mold during continuous casting, generation of width change flaws is suppressed and long-term use is possible. As a result, stable operation and reduction of manufacturing costs are achieved, and an industrially beneficial effect is brought about.
【図１】使用後の短辺銅板幅寸法の測定結果である。FIG. 1 is a measurement result of a short side copper plate width dimension after use.
【図２】短辺銅板の摺動面における幅変更疵を模式的に
示す図である。FIG. 2 is a view schematically showing a width change flaw on a sliding surface of a short side copper plate.
【図３】摺動面と長辺銅板との接触長さと、長辺銅板表
面における幅変更疵との関係を調査した結果を示す図で
ある。FIG. 3 is a view showing a result of investigation on a relationship between a contact length between a sliding surface and a long-side copper plate and a width change flaw on a surface of the long-side copper plate.
【図４】本発明による幅可変鋳型の実施の形態の１例を
示す斜視図である。FIG. 4 is a perspective view showing an example of an embodiment of a variable width mold according to the present invention.
【図５】本発明の実施の形態の例を示す図で、短辺銅板
と長辺銅板との接触状態を示す概略平面図である。FIG. 5 is a view showing an example of the embodiment of the present invention, and is a schematic plan view showing a contact state between a short side copper plate and a long side copper plate.
【図６】本発明の実施の形態の他の例を示す図で、短辺
銅板と長辺銅板との接触状態を示す概略平面図である。FIG. 6 is a view showing another example of the embodiment of the present invention, and is a schematic plan view showing a contact state between a short side copper plate and a long side copper plate.
【図７】本発明の実施の形態の他の例を示す図で、短辺
銅板と長辺銅板との接触状態を示す概略平面図である。FIG. 7 is a view showing another example of the embodiment of the present invention, and is a schematic plan view showing a contact state between a short side copper plate and a long side copper plate.
【図８】従来の連続鋳造用幅可変鋳型の１例を示す斜視
図である。FIG. 8 is a perspective view showing an example of a conventional variable width mold for continuous casting.
１ 幅可変鋳型 ２ 鋳型長辺 ３ 長辺銅板 ４ 長辺バックアップフレーム ５ 鋳型短辺 ６ 短辺銅板 ７ 短辺バックアップフレーム ８ クランプ力調整装置 ９ 原動機 １０ 摺動面 １１ 凹溝 DESCRIPTION OF SYMBOLS 1 Width variable mold 2 Mold long side 3 Long side copper plate 4 Long side backup frame 5 Mold short side 6 Short side copper plate 7 Short side backup frame 8 Clamping force adjusting device 9 Prime mover 10 Sliding surface 11 Groove
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前田 浩史 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 Ｆターム(参考） 4E004 AA05 AE01 AE10 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Maeda 1-2-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Nihon Kokan Co., Ltd. 4E004 AA05 AE01 AE10
Claims (2)
板に挟持され、長辺銅板内を移動可能な一対の短辺銅板
とを具備した連続鋳造用幅可変鋳型において、短辺銅板
の摺動面と長辺銅板との接触面の厚みが１０〜２５ｍｍ
であることを特徴とする連続鋳造用幅可変鋳型。1. A variable width mold for continuous casting comprising a pair of opposed long-side copper plates and a pair of short-side copper plates sandwiched between the long-side copper plates and movable in the long-side copper plate. The thickness of the contact surface between the sliding surface and the long side copper plate is 10 to 25 mm
A variable width mold for continuous casting, characterized in that:
板に挟持され、長辺銅板内を移動可能な一対の短辺銅板
とを具備した連続鋳造用幅可変鋳型において、短辺銅板
の摺動面中央部に鋳造方向に延びる凹溝を設け、当該摺
動面と長辺銅板との接触面の厚みが前記凹溝の両側で各
々３〜２５ｍｍとなることを特徴とする連続鋳造用幅可
変鋳型。2. A variable width mold for continuous casting comprising a pair of opposed long side copper plates and a pair of short side copper plates sandwiched between the long side copper plates and movable in the long side copper plate. Wherein a groove extending in the casting direction is provided at the center of the sliding surface, and the thickness of the contact surface between the sliding surface and the long side copper plate is 3 to 25 mm on both sides of the groove. Variable width casting mold.
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|---|---|---|---|
| JP2000354275A JP3570374B2 (en) | 2000-11-21 | 2000-11-21 | Variable width mold for continuous casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000354275A JP3570374B2 (en) | 2000-11-21 | 2000-11-21 | Variable width mold for continuous casting |
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| Publication Number | Publication Date |
|---|---|
| JP2002153948A true JP2002153948A (en) | 2002-05-28 |
| JP3570374B2 JP3570374B2 (en) | 2004-09-29 |
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010214427A (en) * | 2009-03-17 | 2010-09-30 | Nippon Steel Engineering Co Ltd | Short side structure of continuous casting mold |
| WO2013100211A1 (en) * | 2011-12-26 | 2013-07-04 | 주식회사 포스코 | Size-variable casting mold |
| KR101503444B1 (en) | 2012-12-12 | 2015-03-17 | 주식회사 포스코 | Mold and continuous casting method using it |
-
2000
- 2000-11-21 JP JP2000354275A patent/JP3570374B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010214427A (en) * | 2009-03-17 | 2010-09-30 | Nippon Steel Engineering Co Ltd | Short side structure of continuous casting mold |
| WO2013100211A1 (en) * | 2011-12-26 | 2013-07-04 | 주식회사 포스코 | Size-variable casting mold |
| CN104053514A (en) * | 2011-12-26 | 2014-09-17 | Posco公司 | Size-variable casting mold |
| KR101503444B1 (en) | 2012-12-12 | 2015-03-17 | 주식회사 포스코 | Mold and continuous casting method using it |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3570374B2 (en) | 2004-09-29 |
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