JPH0910895A - Mold for continuous casting - Google Patents
Mold for continuous castingInfo
- Publication number
- JPH0910895A JPH0910895A JP18637995A JP18637995A JPH0910895A JP H0910895 A JPH0910895 A JP H0910895A JP 18637995 A JP18637995 A JP 18637995A JP 18637995 A JP18637995 A JP 18637995A JP H0910895 A JPH0910895 A JP H0910895A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- sides
- shrinkage
- curved surface
- continuous casting
- 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
- 238000009749 continuous casting Methods 0.000 title claims abstract description 34
- 238000005452 bending Methods 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract description 3
- 230000005855 radiation Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000008602 contraction Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000007847 structural defect Effects 0.000 description 2
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は連続鋳造用鋳型に関す
る。さらに詳しくは、断面矩形の角鋳片を連続鋳造する
ための鋳型に関する。FIELD OF THE INVENTION The present invention relates to a continuous casting mold. More specifically, it relates to a mold for continuously casting square slabs having a rectangular cross section.
【０００２】[0002]
【従来の技術】上端と下端が開放した底無し鋳型を用い
て鋼を連続鋳造する場合、鋳込んだ溶鋼が冷却されるに
従って凝固シェルが発達していくが、このとき鋳片自体
が収縮するので、鋳型壁との間にギャップが生じやすく
なる。ギャップが生じると鋳型と鋳片凝固シェルとの間
の熱伝導が著しく低下し、鋳片の冷却が不均一となり、
菱形変形やクラック、組織不良等の品質欠陥が発生す
る。かかる問題を解決するため、従来は鋳型壁内面に上
端から下端に向け先細となる単一のテーパーを設けるこ
とが行われたが、その後、鋳込速度の高速化のため凝固
段階に応じた多段テーパー（溶鋼の湯面より下流側ほど
漸減する勾配テーパー率）を付与するもの（特開平７−
５１８０３号など）が提案された。また、近年は、さら
なる鋳込速度の増大と鋳片破壊やブレークアウトを防止
することを目的として異形断面鋳型が提案されており、
かかる異形断面鋳型として、特開平４−３１９０４４号
公報や米国特許第４２０７９４１号公報に記載された鋳
型がある。特開平４−３１９０４４号公報に記載された
鋳型は、鋳型の上半分では鋳型壁の横断面輪郭を構成す
る４辺全部の略中央部を湾曲して張り出させて張出し部
を形成し、その張出し量は下方に向って減少させてお
り、鋳型の下半分ではキャビティーが略四角形に形成さ
れている。米国特許第４２０７９４１号公報に記載され
た鋳型は、鋳型の上端部はコーナーが谷状になった四角
形であり、中間部はテーパーが付けられ、下端部ではコ
ーナーが八字状に形成され、横断面が不規則な十二角形
に形成されている。2. Description of the Related Art When continuously casting steel using a bottomless mold having open upper and lower ends, a solidified shell develops as the cast molten steel cools, but at this time, the slab itself shrinks. , A gap is likely to occur between the mold wall and the mold wall. When the gap occurs, the heat conduction between the mold and the slab solidification shell is significantly reduced, and the slab is cooled unevenly,
Quality defects such as rhombic deformation, cracks, and structural defects occur. In order to solve this problem, conventionally, a single taper tapering from the upper end to the lower end was provided on the inner surface of the mold wall. A taper (gradient taper rate that gradually decreases toward the downstream side of the molten steel surface) is provided (JP-A-7-
No. 51803) was proposed. Further, in recent years, a modified cross-section mold has been proposed for the purpose of further increasing the casting speed and preventing slab breakage and breakout,
As such a modified cross-section mold, there are molds described in JP-A-4-319044 and US Pat. No. 4,207,941. In the mold described in JP-A-4-319044, in the upper half of the mold, the substantially central portion of all four sides constituting the cross-sectional contour of the mold wall is curved and overhangs to form an overhang portion. The amount of protrusion is reduced downward, and the cavity is formed in a substantially square shape in the lower half of the mold. The mold described in U.S. Pat. No. 4,207,941 has a quadrangular shape in which the upper end of the mold has valleys at the corners, the middle part is tapered, and the corners at the lower end are formed in an octagonal shape. Is formed into an irregular dodecagon.
【０００３】[0003]
【発明が解決しようとする課題】しかるに、前記従来の
異形断面の鋳型は、鋳型壁（チューブともいう）を加工
・成形するのに工数が多くかかり、製造コストが高いと
いう問題がある。また、上記従来の鋳型で解決できなか
った問題として、次の点がある。すなわち、図８に示す
湾曲型連続鋳造機で、寸法が小さい鋳片を鋳造する場
合、湾曲半径Ｒが小さく、鋳型Ｍの湾曲半径外側壁面
（以下、Ｒ外面という）と湾曲半径内側壁面（以下、Ｒ
内面という）では、鋳片冷却条件に差が発生し易い。な
ぜならば、タンディッシュＴからの注入流が、鋳型Ｍ内
でＲ外面の凝固シェルを再溶解したり凝固シェルの生成
遅れを惹起することがあり、さらに、複数の鋳片サイズ
を生産する連続鋳造機やフットロールのない鋳型でよく
観察されるようにＲ内面方向へ鋳片が変位することがあ
るからである。そして、鋳片のＲ内面とＲ外面とで冷却
条件が異なると、凝固シェルの厚さが不均一になり、や
はり鋳片品質を低下させたり、ブレークアウト等の事故
の原因となる。However, the above-mentioned conventional mold having an irregular cross section has a problem that it takes a lot of man-hours to process and mold a mold wall (also referred to as a tube) and the manufacturing cost is high. Further, there are the following points as problems that cannot be solved by the above-mentioned conventional mold. That is, in the case of casting a small slab with the curved continuous casting machine shown in FIG. 8, the curved radius R is small, and the curved radius outer wall surface (hereinafter, R outer surface) and the curved radius inner wall surface (hereinafter, R radius surface) of the mold M. , R
The inner surface) is likely to cause a difference in the slab cooling conditions. This is because the injection flow from the tundish T may remelt the solidified shell on the outer surface of the R in the mold M or cause a delay in the formation of the solidified shell, and further, continuous casting that produces a plurality of slab sizes. This is because the slab may be displaced toward the R inner surface as is often observed in a mold without a machine or a foot roll. If the R inner surface and the R outer surface of the slab have different cooling conditions, the thickness of the solidified shell becomes non-uniform, which also deteriorates the slab quality and causes an accident such as breakout.
【０００４】上記の事情に鑑み、本発明は加工・成形が
容易で製造コストを低下しうる連続鋳造用鋳型を提供す
ることを目的とする。また、本発明は、湾曲半径が小さ
い連続鋳造用鋳型であってもＲ内外の抜熱量を細かく調
整し、鋳片全周の凝固シェル厚を均一にしうる連続鋳造
用鋳型を提供することを目的とする。In view of the above circumstances, it is an object of the present invention to provide a continuous casting mold which can be easily processed / molded and whose manufacturing cost can be reduced. Another object of the present invention is to provide a continuous casting mold capable of finely adjusting the heat removal amount inside and outside R even in a continuous casting mold having a small bending radius to make the solidified shell thickness around the entire circumference of the slab uniform. And
【０００５】[0005]
【課題を解決するための手段】第１発明（請求項１の発
明）は、上端と下端が開放され、筒形のキャビティーを
有し、上端から下端に向け先細となるテーパーが付与さ
れた連続鋳造用鋳型であって、該鋳型壁の横断面輪郭を
構成する４辺のうち、湾曲半径外側の基準辺を除く他の
辺に収縮補償曲面を形成し、残りの辺を収縮補償曲面を
形成しない直線辺としたことを特徴とする。上記第１発
明の好ましい実施態様としては、「前記収縮補償曲面
が、湾曲半径外側の基準辺に直交する２辺に形成されて
いる鋳型」、「前記収縮補償曲面が、湾曲半径内側また
は外側の１辺を除く他の３辺に形成されている鋳型」が
挙げられる。また、第２発明（請求項５の発明）は、上
端と下端が開放され、筒形のキャビティーを有し、上端
から下端に向け先細となるテーパーが付与された湾曲型
の連続鋳造用鋳型であって、該鋳型の横断面輪郭を構成
する４辺の全てに収縮補償曲面を形成し、該収縮補償曲
面に基づく収縮補償率が、湾曲半径外側の基準辺と湾曲
半径内側の自由辺と非湾曲側の両側辺との間で相互に異
なっていることを特徴とする。上記第２発明の好ましい
実施態様としては、「前記非湾曲側の両側辺の収縮補償
率、前記自由辺の収縮補償率、前記基準辺の収縮補償率
が、その順で小さくなっている鋳型」、および「前記基
準辺において収縮補償曲面を形成している上下方向の長
さである曲面領域と、前記両側辺において収縮補償曲面
を形成している曲面領域とが、互いに異なっている鋳
型」が挙げられる。なお、本発明において、収縮補償曲
面とは、鋳型の四辺に鋳片の収縮を補償するように各辺
の中央部分を外側へ膨出させるか、各辺の両端部を内側
へ寄せるか、図７に示す一定曲率加工で溝深さ（δ）を
加減した部分をいう。また、収縮補償率とは、鋳型片の
輪郭方向の長さの鋳型上下方向において変化する割合を
いい、図６に基づき説明すると、曲面辺では、（Ｓ1 −
Ｓ2 ）／（Ｓ1 ・Δｈ）で表わされ、直線辺では（d 1
−d 2 ）／（d 1 ・Δｈ）で表わされる。なお、直線辺
ではテーパー量と同意となる。さらに、一定曲率加工辺
とは、曲面辺であっても、曲面半径が鋳型上下方向で同
一であって加工が容易であるものをいう。In the first invention (the invention of claim 1), an upper end and a lower end are opened, a cylindrical cavity is provided, and a taper which is tapered from the upper end to the lower end is provided. In the continuous casting mold, a shrinkage-compensating curved surface is formed on the other sides of the four sides forming the cross-sectional contour of the mold wall, excluding the reference side outside the bending radius, and the remaining sides are shrink-compensating curved surfaces. It is characterized in that it is a straight side that is not formed. As a preferred embodiment of the first invention, "a mold in which the shrinkage compensation curved surface is formed on two sides orthogonal to a reference side on the outside of the curvature radius", "the shrinkage compensation curved surface is on the inside or outside of the curvature radius The molds formed on the other three sides excluding one side "can be mentioned. A second invention (the invention of claim 5) is a curved casting mold for continuous casting, which has a cylindrical cavity having an open upper end and a lower end, and is tapered from the upper end to the lower end. The shrinkage-compensating curved surface is formed on all of the four sides forming the cross-sectional contour of the mold, and the shrinkage-compensating rate based on the shrinkage-compensating curved surface has a reference side outside the bending radius and a free side inside the bending radius. It is characterized in that they are different from each other on both sides on the non-curved side. As a preferred embodiment of the second aspect of the invention, "a mold in which the shrinkage compensation rate of both sides on the non-curved side, the shrinkage compensation rate of the free side, and the shrinkage compensation rate of the reference side are decreasing in that order" , And “a mold in which a curved surface area that is a length in the up-down direction that forms a shrinkage-compensated curved surface on the reference side and a curved surface area that forms a shrinkage-compensated curved surface on the both side edges are different from each other”. Can be mentioned. In the present invention, the shrinkage-compensating curved surface means to bulge the central portion of each side outward so as to compensate the shrinkage of the slab on the four sides of the mold, or to bring both ends of each side inward. It refers to a portion where the groove depth (δ) is adjusted by the constant curvature processing shown in 7. Further, the shrinkage compensation rate means a rate of change of the length in the contour direction of the mold piece in the vertical direction of the mold. Explaining based on FIG. 6, in the curved surface side, (S 1 −
It is represented by S 2 ) / (S 1 · Δh), and (d 1
It is represented by −d 2 ) / (d 1 · Δh). It should be noted that the taper amount is synonymous with the straight side. Further, the constant curvature processing side means that even if it is a curved surface side, the radius of the curved surface is the same in the vertical direction of the mold and the processing is easy.
【０００６】[0006]
【作用】第１発明では、鋳型壁の横断面輪郭を構成する
４辺のうちの一部の辺に収縮補償曲面を形成している
が、このように鋳型壁の全周に収縮補償曲面が形成され
ていなくても、一部の収縮補償曲面でも、鋳片の収縮を
補償し鋳型壁との間にギャップが生じないようにするこ
とは可能である。そして、第１発明では、一部の辺が直
線辺であるので、鋳型壁の製作、維持保全が容易であ
る。 第２発明では、鋳型壁の４辺全部に収縮補償曲面
が形成されているので、各辺毎の抜熱量を細かく調整す
ることができ、Ｒ内面とＲ外面との抜熱量の差、Ｒ内外
面と両側面との抜熱量の差を最適に調整して、たとえ湾
曲半径の小さい鋳片でも鋳片全周の凝固シェル厚を均一
化することができる。In the first aspect of the invention, the shrinkage-compensating curved surface is formed on a part of the four sides forming the cross-sectional contour of the mold wall. Even if it is not formed, it is possible to compensate the shrinkage of the slab and prevent a gap from being formed between the mold wall and some of the shrinkage-compensating curved surfaces. Further, in the first invention, since some of the sides are straight sides, it is easy to manufacture and maintain the mold wall. In the second invention, since the shrinkage compensation curved surface is formed on all four sides of the mold wall, the heat removal amount for each side can be finely adjusted, and the difference in heat removal amount between the R inner surface and the R outer surface, By optimally adjusting the difference in heat removal amount between the outer surface and both side surfaces, it is possible to make the solidified shell thickness uniform around the entire circumference of the cast piece even if the cast piece has a small bending radius.
【０００７】[0007]
【実施例】つぎに、第１発明の実施例を図面に基づき説
明する。図１〜３は第１発明の各実施例の説明図であ
り、図１の(a) 図は第１実施例の鋳型Ｍ１の縦断正面
図、(b) 図は縦断側面図、(c) 図は平面図、(d) 図は底
面図、図２は第２実施例の鋳型Ｍ２の平面図、図３は第
３実施例の鋳型Ｍ３の平面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the first invention will be described with reference to the drawings. 1 to 3 are explanatory views of each embodiment of the first invention, FIG. 1A is a vertical front view of a mold M1 of the first embodiment, FIG. 1B is a vertical side view, and FIG. The drawing is a plan view, (d) is a bottom view, FIG. 2 is a plan view of the mold M2 of the second embodiment, and FIG. 3 is a plan view of the mold M3 of the third embodiment.
【０００８】（第１実施例）第１実施例の鋳型Ｍ１は図
１に示すように、鋳型壁１〜４の相対する２辺に収縮補
償曲面を形成したものである。図示の例では、Ｒ外面の
基準辺１とＲ内面の自由辺２（基準辺１と自由辺２は通
常長辺となるので、以下、長辺１，２ともいう）にテー
パーＴのみ付与した直線辺とし、両側辺３，４（両側辺
３，４は通常短辺となるので、以下、短辺３，４ともい
う）に収縮補償曲面Ｃを形成している。この収縮補償曲
面Ｃは各辺の中央部を外側に膨出させるか、各辺の両端
部を内側に寄せることにより形成される。そして、この
収縮補償曲面Ｃを形成した収縮補償域Ｌは鋳型の上端か
ら下端に向けて途中まで形成されている。テーパーＴに
よる収縮補償量も収縮補償曲面Ｃによる収縮補償量も、
収縮補償領域Ｌの上端から下端に向けて低減している。
鋳型Ｍ１の下端部は収縮補償曲面が形成されていないの
で、各辺１〜４は直線辺となっている。本実施例の鋳型
では、長辺１，２のテーパーＴと短辺３，４の収縮補償
曲面Ｃによって、鋳片の凝固による収縮に鋳型壁が追随
してギャップが生じないようになっているが、長辺１，
２は直線辺であるので、加工が容易であり、維持管理も
容易である。例えば、全周に収縮補償曲面Ｃを加工する
場合に比べると、ＮＣテープ作成費で約1/3 、機械加工
費で約1/2 以下となる。(First Embodiment) As shown in FIG. 1, the mold M1 of the first embodiment has shrinkage compensating curved surfaces formed on two opposite sides of mold walls 1 to 4. In the illustrated example, only the taper T is given to the reference side 1 of the R outer surface and the free side 2 of the R inner surface (hereinafter, the reference side 1 and the free side 2 are usually long sides, and therefore, also referred to as the long sides 1 and 2 hereinafter). The shrinkage-compensating curved surface C is formed on both sides 3, 4 (both sides 3, 4 are usually short sides, so they are also referred to as short sides 3, 4 hereinafter). The shrinkage compensation curved surface C is formed by bulging the central portion of each side outward or by bringing both end portions of each side inward. Then, the shrinkage compensation region L forming this shrinkage compensation curved surface C is formed partway from the upper end to the lower end of the mold. Both the shrinkage compensation amount by the taper T and the shrinkage compensation amount by the shrinkage compensation curved surface C are
The shrinkage compensation region L decreases from the upper end toward the lower end.
Since the shrinkage-compensating curved surface is not formed at the lower end of the mold M1, each side 1 to 4 is a straight side. In the mold of this embodiment, the taper T of the long sides 1 and 2 and the shrinkage compensating curved surface C of the short sides 3 and 4 prevent the mold wall from following the shrinkage due to the solidification of the slab, and thus no gap is generated. But long side 1,
Since 2 is a straight side, processing is easy and maintenance is also easy. For example, compared with the case where the shrinkage compensation curved surface C is processed on the entire circumference, the NC tape production cost is about 1/3 and the machining cost is about 1/2 or less.
【０００９】（第２〜３実施例）第２実施例の鋳型Ｍ２
は図２に示すように、自由辺である長辺２に収縮補償曲
面Ｃを形成したものである。ただし、湾曲半径が小さい
鋳型では、鋳片がＲ内面側へ変位しがちであるので、収
縮補償曲面Ｃを設けない方が好ましい。第３実施例の鋳
型Ｍ３は、非湾曲側の２辺と、湾曲側の２辺のうちの１
辺に収縮補償曲面Ｃを形成するもので、図３は両短辺
３，４と自由辺側の長辺２に収縮補償曲面Ｃを形成した
ものである。上記の第２〜３実施例においては、いずれ
も直線辺が１〜３辺分残っているので、鋳型壁の作成は
容易である。(Second to Third Embodiments) The mold M2 of the second embodiment.
As shown in FIG. 2, the shrinkage compensation curved surface C is formed on the long side 2 which is the free side. However, in a mold having a small bending radius, the slab tends to be displaced to the R inner surface side, and therefore it is preferable not to provide the shrinkage compensation curved surface C. The mold M3 of the third embodiment has one of two sides on the non-curved side and two sides on the curved side.
The shrinkage compensation curved surface C is formed on the side, and in FIG. 3, the shrinkage compensation curved surface C is formed on both short sides 3 and 4 and the long side 2 on the free side. In each of the above-mentioned second to third embodiments, the straight-line side remains for one to three sides, so that it is easy to form the mold wall.
【００１０】（第１発明の他の実施例）前記第１〜３実
施例における収縮補償曲面Ｃの他の例として一定曲率加
工辺がある。この一定曲率加工辺とは、各辺の横断面形
状が曲面となっていても、その曲率半径ρが上下いずれ
のレベルにおいて同一であるものをいう。この場合、半
径ρを同一にしながら、曲面の深さδを下方に向って低
減するため、半径ρの中心を下方に向かって壁面から遠
ざけながら加工すればよい。このように、半径ρが同一
であると、その加工は直線辺に準じて容易に加工するこ
とができる。(Other embodiment of the first invention) Another example of the shrinkage compensation curved surface C in the first to third embodiments is a constant curvature processing side. The constant curvature processing side means that the radius of curvature ρ is the same at any of the upper and lower levels even if the cross-sectional shape of each side is a curved surface. In this case, in order to reduce the depth δ of the curved surface downward while keeping the radius ρ the same, it suffices to perform processing while moving the center of the radius ρ downward and away from the wall surface. Thus, if the radii ρ are the same, the processing can be easily performed according to the straight sides.
【００１１】つぎに、第２発明の実施例を図面に基づき
説明する。図４は第２発明の一実施例（第４実施例）の
説明図であり、(a) 図は鋳型壁Ｍ４の縦断正面図、(b)
図は縦断側面図、(c) 図は平面図、(d) 図は底面図、
(e)図は収縮補償率の説明図、図５は第２発明の他の実
施例（第５実施例）の説明図であり、(a) 図は縦断正面
図、(b) 図は縦断側面図、(c) 図は平面図である。Next, an embodiment of the second invention will be described with reference to the drawings. FIG. 4 is an explanatory view of an embodiment (fourth embodiment) of the second invention, (a) FIG. 4 is a vertical sectional front view of a mold wall M4, (b)
Figure is a vertical side view, (c) is a plan view, (d) is a bottom view,
(e) is an explanatory view of the shrinkage compensation rate, FIG. 5 is an explanatory view of another embodiment (fifth embodiment) of the second invention, (a) is a vertical sectional front view, and (b) is a vertical sectional view. The side view and (c) are plan views.
【００１２】（第４実施例）第４実施例の鋳型Ｍ４は図
４に示すように、鋳型壁４辺１〜４の全てに収縮補償曲
面Ｃを形成したものであり、長辺側１，２も短辺側３，
４も収縮補償領域Ｌは同じ長さである。ただし、各辺の
収縮補償率は相違している。短辺３，４の収縮補償率を
α、自由側長辺２の収縮補償率をβ、基準側長辺１の収
縮補償率をγとすると、α＞β＞γとするのが一例であ
る。そして、各収縮補償率α、β、γを細かく調整する
ことにより、鋳片全周の抜熱量を均一化でき、凝固シェ
ルの厚さをより均一にできる。また、鋳片全周で温度条
件が均一ならば、長辺の収縮が大きくなるので、そのよ
うな場合はα＜β＜γとすればよい。(Fourth Embodiment) As shown in FIG. 4, a mold M4 according to a fourth embodiment has shrinkage-compensating curved surfaces C formed on all four sides 1 to 4 of the mold wall. 2 also on the short side 3,
In 4 as well, the shrinkage compensation region L has the same length. However, the shrinkage compensation rate on each side is different. When the shrinkage compensation rate of the short sides 3 and 4 is α, the shrinkage compensation rate of the free side long side 2 is β, and the shrinkage compensation rate of the reference side long side 1 is γ, α>β> γ is an example. . By finely adjusting each shrinkage compensation rate α, β, γ, the amount of heat removed over the entire circumference of the slab can be made uniform, and the thickness of the solidified shell can be made more uniform. Further, if the temperature condition is uniform over the entire circumference of the slab, the contraction of the long side becomes large. In such a case, α <β <γ may be set.
【００１３】（第５実施例）第５実施例の鋳型Ｍ５は図
５に示すように、４辺１〜４の全てに収縮補償曲面Ｃを
形成したものであるが、収縮補償領域を異ならせたもの
である。図示の例では、短辺３，４側の収縮補償領域L2
が長辺１，２側の収縮補償領域L1より短くされている
が、収縮補償領域L1，L2の長さが反対であってもよい。
このように前記収縮補償率α、β、γの調整に加え、ま
たは単独で収縮補償領域L1，L2を調整することにより、
さらに抜熱量を微調整すれば、より一層、凝固シェルの
厚さを均一化することができ、とりわけ、鋳片サイズの
小さい鋳片の品質向上と操業の安定化に有効である。(Fifth Embodiment) As shown in FIG. 5, the mold M5 of the fifth embodiment has shrinkage compensation curved surfaces C formed on all four sides 1 to 4, but the shrinkage compensation regions are different. It is a thing. In the illustrated example, the shrinkage compensation area L2 on the short sides 3 and 4 side
Is shorter than the contraction compensation region L1 on the long sides 1 and 2, the contraction compensation regions L1 and L2 may have opposite lengths.
Thus, in addition to adjusting the shrinkage compensation ratios α, β, γ, or by adjusting the shrinkage compensation regions L1 and L2 independently,
Further, if the amount of heat removal is finely adjusted, the thickness of the solidified shell can be made more uniform, and it is particularly effective for improving the quality of the small slab and stabilizing the operation.
【００１４】[0014]
【発明の効果】第１発明によれば、加工・成形が容易で
製造コストが低く、維持管理が容易な連続鋳造用鋳型を
提供することができる。第２発明によれば、湾曲半径が
小さい連続鋳造用鋳型であってもＲ内外の抜熱量を細か
く調整し、鋳片全周の凝固シェル厚を均一にし、鋳片品
質を向上させることができる。According to the first aspect of the present invention, it is possible to provide a continuous casting mold that is easy to process and mold, has a low manufacturing cost, and is easy to maintain. According to the second aspect of the present invention, even with a continuous casting mold having a small bending radius, it is possible to finely adjust the heat removal amount inside and outside R to make the solidified shell thickness uniform around the entire circumference of the slab and improve the slab quality. .
【図面の簡単な説明】[Brief description of the drawings]
【図１】第１発明の第１実施例の説明図であり、(a) 図
は第１実施例の鋳型Ｍ１の縦断面正面図、(b) 図は縦断
側面図、(c) 図は平面図、(d) 図は底面図である。1A and 1B are explanatory views of a first embodiment of the first invention, in which FIG. 1A is a vertical cross-sectional front view of a mold M1 of the first embodiment, FIG. 1B is a vertical sectional side view, and FIG. The plan view and (d) are bottom views.
【図２】第１発明の第２実施例の鋳型Ｍ２の平面図であ
る。FIG. 2 is a plan view of a mold M2 according to a second embodiment of the first invention.
【図３】第１発明の第３実施例の鋳型Ｍ３の平面図であ
る。FIG. 3 is a plan view of a mold M3 according to a third embodiment of the first invention.
【図４】第２発明の一実施例（第４実施例）の説明図で
あり、(a) 図は鋳型Ｍ４の縦断正面図、(b) 図は縦断側
面図、(c) 図は平面図、(d) 図は底面図、(e) 図は収縮
補償率の説明図である。FIG. 4 is an explanatory view of an embodiment (fourth embodiment) of the second invention, wherein (a) is a vertical front view of the mold M4, (b) is a vertical side view, and (c) is a plan view. The figure, (d) figure is a bottom view, and (e) figure is an explanatory view of the shrinkage compensation rate.
【図５】第２発明の他の実施例（第５実施例）の説明図
であり、(a) 図は縦断正面図、(b) 図は縦断側面図、
(c) 図は平面図である。FIG. 5 is an explanatory view of another embodiment (fifth embodiment) of the second invention, wherein (a) is a vertical sectional front view, (b) is a vertical sectional side view,
(c) The figure is a plan view.
【図６】収縮補償率の定義の説明図である。FIG. 6 is an explanatory diagram of definition of shrinkage compensation rate.
【図７】一定曲率加工辺の説明図で、（ａ）は各辺の中
央部に形成している場合の説明図、（ｂ）は各辺の両端
の合せ部に形成している場合の説明図である。7A and 7B are explanatory views of a constant curvature processing side, where FIG. 7A is an explanatory view when the side is formed at the center of each side, and FIG. 7B is a description when the side is formed at both ends of each side. FIG.
【図８】曲率半径が小さい連続鋳造用鋳型の問題点の説
明図である。FIG. 8 is an explanatory diagram of a problem of a continuous casting mold having a small radius of curvature.
１ 基準辺（長辺） ２ 自由辺
（長辺） ３ 両側辺（短辺） ４ 両側辺
（短辺） Ｔ テーパー Ｃ 収縮補償
曲面 Ｌ，L1，L2 収縮補償領域 Ｍ１ 鋳型 Ｍ２ 鋳型 Ｍ３ 鋳型 Ｍ４ 鋳型 Ｍ５ 鋳型1 Standard Side (Long Side) 2 Free Side (Long Side) 3 Both Sides (Short Side) 4 Both Sides (Short Side) T Taper C Shrinkage Compensation Surface L, L1, L2 Shrinkage Compensation Area M1 Mold M2 Mold M3 Mold M4 Mold M5 mold
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成７年９月２０日[Submission date] September 20, 1995
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【書類名】 明細書[Document Name] Statement
【発明の名称】 連続鋳造用鋳型[Title of Invention] Mold for continuous casting
【特許請求の範囲】[Claims]
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は連続鋳造用鋳型に関す
る。さらに詳しくは、断面矩形の角鋳片を連続鋳造する
ための鋳型に関する。FIELD OF THE INVENTION The present invention relates to a continuous casting mold. More specifically, it relates to a mold for continuously casting square slabs having a rectangular cross section.
【０００２】[0002]
【従来の技術】上端と下端が開放した底無し鋳型を用い
て鋼を連続鋳造する場合、鋳込んだ溶鋼が冷却されるに
従って凝固シェルが発達していくが、このとき鋳片自体
が収縮するので、鋳型壁との間にギャップが生じやすく
なる。ギャップが生じると鋳型と鋳片凝固シェルとの間
の熱伝導が著しく低下し、鋳片の冷却が不均一となり、
菱形変形やクラック、組織不良等の品質欠陥が発生す
る。かかる問題を解決するため、従来は鋳型壁内面に上
端から下端に向け先細となる単一のテーパーを設けるこ
とが行われたが、その後、鋳込速度の高速化のため凝固
段階に応じた多段テーパー（溶鋼の湯面より下流側ほど
漸減する勾配テーパー率）を付与するもの（特開平７−
５１８０３号など）が提案された。また、近年は、さら
なる鋳込速度の増大と鋳片破壊やブレークアウトを防止
することを目的として異形断面鋳型が提案されており、
かかる異形断面鋳型として、特開平４−３１９０４４号
公報や米国特許第４２０７９４１号公報に記載された鋳
型がある。特開平４−３１９０４４号公報に記載された
鋳型は、鋳型の上半分では鋳型壁の横断面輪郭を構成す
る４辺全部の略中央部を湾曲して張り出させて張出し部
を形成し、その張出し量は下方に向って減少させてお
り、鋳型の下半分ではキャビティーが略四角形に形成さ
れている。米国特許第４２０７９４１号公報に記載され
た鋳型は、鋳型の上端部はコーナーが谷状になった四角
形であり、中間部はテーパーが付けられ、下端部ではコ
ーナーが八字状に形成され、横断面が不規則な十二角形
に形成されている。2. Description of the Related Art When continuously casting steel using a bottomless mold having open upper and lower ends, a solidified shell develops as the cast molten steel cools, but at this time, the slab itself shrinks. , A gap is likely to occur between the mold wall and the mold wall. When the gap occurs, the heat conduction between the mold and the slab solidification shell is significantly reduced, and the slab is cooled unevenly,
Quality defects such as rhombic deformation, cracks, and structural defects occur. In order to solve this problem, conventionally, a single taper tapering from the upper end to the lower end was provided on the inner surface of the mold wall. A taper (gradient taper rate that gradually decreases toward the downstream side of the molten steel surface) is provided (JP-A-7-
No. 51803) was proposed. Further, in recent years, a modified cross-section mold has been proposed for the purpose of further increasing the casting speed and preventing slab breakage and breakout,
As such a modified cross-section mold, there are molds described in JP-A-4-319044 and US Pat. No. 4,207,941. In the mold described in JP-A-4-319044, in the upper half of the mold, the substantially central portion of all four sides constituting the cross-sectional contour of the mold wall is curved and overhangs to form an overhang portion. The amount of protrusion is reduced downward, and the cavity is formed in a substantially square shape in the lower half of the mold. The mold described in U.S. Pat. No. 4,207,941 has a quadrangular shape in which the upper end of the mold has valleys at the corners, the middle part is tapered, and the corners at the lower end are formed in an octagonal shape. Is formed into an irregular dodecagon.
【０００３】[0003]
【発明が解決しようとする課題】しかるに、前記従来の
異形断面の鋳型は、鋳型壁（チューブともいう）を加工
・成形するのに工数が多くかかり、製造コストが高いと
いう問題がある。また、上記従来の鋳型で解決できなか
った問題として、次の点がある。すなわち、図８に示す
湾曲型連続鋳造機で、寸法が小さい鋳片を鋳造する場
合、湾曲半径Ｒが小さく、鋳型Ｍの湾曲半径外側壁面
（以下、Ｒ外面という）と湾曲半径内側壁面（以下、Ｒ
内面という）では、鋳片冷却条件に差が発生し易い。な
ぜならば、タンディッシュＴからの注入流が、鋳型Ｍ内
でＲ外面の凝固シェルを再溶解したり凝固シェルの生成
遅れを惹起することがあり、さらに、複数の鋳片サイズ
を生産する連続鋳造機やフットロールのない鋳型でよく
観察されるようにＲ内面方向へ鋳片が変位することがあ
るからである。そして、鋳片のＲ内面とＲ外面とで冷却
条件が異なると、凝固シェルの厚さが不均一になり、や
はり鋳片品質を低下させたり、ブレークアウト等の事故
の原因となる。However, the above-mentioned conventional mold having an irregular cross section has a problem that it takes a lot of man-hours to process and mold a mold wall (also referred to as a tube) and the manufacturing cost is high. Further, there are the following points as problems that cannot be solved by the above-mentioned conventional mold. That is, in the case of casting a small slab with the curved continuous casting machine shown in FIG. 8, the curved radius R is small, and the curved radius outer wall surface (hereinafter, R outer surface) and the curved radius inner wall surface (hereinafter, R radius surface) of the mold M. , R
The inner surface) is likely to cause a difference in the slab cooling conditions. This is because the injection flow from the tundish T may remelt the solidified shell on the outer surface of the R in the mold M or cause a delay in the formation of the solidified shell, and further, continuous casting that produces a plurality of slab sizes. This is because the slab may be displaced toward the R inner surface as is often observed in a mold without a machine or a foot roll. If the R inner surface and the R outer surface of the slab have different cooling conditions, the thickness of the solidified shell becomes non-uniform, which also deteriorates the slab quality and causes an accident such as breakout.
【０００４】上記の事情に鑑み、本発明は加工・成形が
容易で製造コストを低下しうる連続鋳造用鋳型を提供す
ることを目的とする。また、本発明は、湾曲半径が小さ
い連続鋳造用鋳型であってもＲ内外の抜熱量を細かく調
整し、鋳片全周の凝固シェル厚を均一にしうる連続鋳造
用鋳型を提供することを目的とする。In view of the above circumstances, it is an object of the present invention to provide a continuous casting mold which can be easily processed / molded and whose manufacturing cost can be reduced. Another object of the present invention is to provide a continuous casting mold capable of finely adjusting the heat removal amount inside and outside R even in a continuous casting mold having a small bending radius to make the solidified shell thickness around the entire circumference of the slab uniform. And
【０００５】[0005]
【課題を解決するための手段】第１発明（請求項１の発
明）は、上端と下端が開放され、筒形のキャビティーを
有し、上端から下端に向け先細となるテーパーが付与さ
れた連続鋳造用鋳型であって、該鋳型壁の横断面輪郭を
構成する４辺のうち、湾曲半径外側の基準辺を除く他の
少なくとも１辺に収縮補償曲面を形成し、残りの辺を収
縮補償曲面を形成しない直線辺としたことを特徴とす
る。上記第１発明の好ましい実施態様としては、「前記
収縮補償曲面が、湾曲半径外側の基準辺に直交する２辺
に形成されている鋳型」、「前記収縮補償曲面が、湾曲
半径外側の基準辺を除く他の３辺に形成されている鋳
型」が挙げられる。また、第２発明（請求項４の発明）
は、上端と下端が開放され、筒形のキャビティーを有
し、上端から下端に向け先細となるテーパーが付与され
た湾曲型の連続鋳造用鋳型であって、該鋳型の横断面輪
郭を構成する４辺の全てに収縮補償曲面を形成し、該収
縮補償曲面に基づく収縮補償率が、湾曲半径外側の基準
辺と湾曲半径内側の自由辺と非湾曲側の両側辺との間で
相互に異なっていることを特徴とする。上記第２発明の
好ましい実施態様としては、「前記非湾曲側の両側辺の
収縮補償率、前記自由辺の収縮補償率、前記基準辺の収
縮補償率が、その順で小さくなっている鋳型」、および
「前記基準辺において収縮補償曲面を形成している上下
方向の長さである曲面領域と、前記両側辺において収縮
補償曲面を形成している曲面領域とが、互いに異なって
いる鋳型」が挙げられる。なお、本発明において、収縮
補償曲面とは、鋳型の四辺に鋳片の収縮を補償するよう
に各辺の中央部分を外側へ膨出させるか、各辺の両端部
を内側へ寄せるか、図７に示す一定曲率加工で溝深さ
（δ）を加減した部分をいう。また、収縮補償率とは、
鋳型片の輪郭方向の長さの鋳型上下方向において変化す
る割合をいい、図６に基づき説明すると、曲面辺では、
（Ｓ１−Ｓ２）／（Ｓ１・△ｈ）で表わされ、直線辺で
は（ｄ１−ｄ２）／（ｄ１・△ｈ）で表わされる。な
お、直線辺ではテーパー量と同意となる。さらに、一定
曲率加工辺とは、曲面辺であっても、曲面半径が鋳型上
下方向で同一であって加工が容易であるものをいう。In the first invention (the invention of claim 1), an upper end and a lower end are opened, a cylindrical cavity is provided, and a taper which is tapered from the upper end to the lower end is provided. A continuous casting mold, which is one of the four sides forming the cross-sectional contour of the mold wall, excluding the reference side outside the bending radius.
The shrinkage-compensating curved surface is formed on at least one side, and the remaining sides are straight sides that do not form the shrinkage-compensating curved surface. As a preferred embodiment of the first invention, "a mold in which the shrinkage-compensating curved surface is formed on two sides orthogonal to a reference side on the outside of the bending radius", "the shrinkage-compensating curved surface is curved half The mold formed on the other three sides excluding the reference side on the outer side of the diameter "is included. The second invention (the invention of claim 4 )
Is a curved-type continuous casting mold having a cylindrical cavity with an open upper end and a lower end, and having a taper that tapers from the upper end to the lower end. A shrinkage-compensated curved surface is formed on all of the four sides, and the shrinkage-compensated ratio based on the shrinkage-compensated curved surface is such that the reference side on the outside of the bending radius, the free side on the inside of the bending radius, and both sides on the non-curving side are mutually Characterized by being different. As a preferred embodiment of the second aspect of the invention, "a mold in which the shrinkage compensation rate of both sides on the non-curved side, the shrinkage compensation rate of the free side, and the shrinkage compensation rate of the reference side are decreasing in that order" , And "a mold in which the curved surface area which is the length in the vertical direction forming the shrinkage compensation curved surface on the reference side and the curved surface area which forms the shrinkage compensation curved surface on the both sides are different from each other". Can be mentioned. Incidentally, in the present invention, the shrinkage compensation curved surface, the central portion of each side to bulge outward so as to compensate the shrinkage of the slab on the four sides of the mold, or to bring both ends of each side inward, It refers to a portion where the groove depth (δ) is adjusted by the constant curvature processing shown in 7. Also, the shrinkage compensation rate is
The ratio of the length in the contour direction of the mold piece that changes in the vertical direction of the mold. Explaining with reference to FIG.
It is represented by (S 1 −S 2 ) / (S 1 · Δh), and is represented by (d 1 −d 2 ) / (d 1 · Δh) on the straight side. It should be noted that the taper amount is synonymous with the straight side. Further, the constant curvature processing side means that even if it is a curved surface side, the radius of the curved surface is the same in the vertical direction of the mold and the processing is easy.
【０００６】[0006]
【作用】第１発明では、鋳型壁の横断面輪郭を構成する
４辺のうちの一部の辺に収縮補償曲面を形成している
が、このように鋳型壁の全周に収縮補償曲面が形成され
ていなくても、一部の収縮補償曲面でも、鋳片の収縮を
補償し鋳型壁との間にギャップが生じないようにするこ
とは可能である。そして、第１発明では、一部の辺が直
線辺であるので、鋳型壁の製作、維持保全が容易であ
る。第２発明では、鋳型壁の４辺全部に収縮補償曲面が
形成されているので、各辺毎の抜熱量を細かく調整する
ことができ、Ｒ内面とＲ外面との抜熱量の差、Ｒ内外面
と両側面との抜熱量の差を最適に調整して、たとえ湾曲
半径の小さい鋳片でも鋳片全周の凝固シェル厚を均一化
することができる。In the first aspect of the invention, the shrinkage-compensating curved surface is formed on a part of the four sides forming the cross-sectional contour of the mold wall. Even if it is not formed, it is possible to compensate the shrinkage of the slab and prevent a gap from being formed between the mold wall and some of the shrinkage-compensating curved surfaces. Further, in the first invention, since some of the sides are straight sides, it is easy to manufacture and maintain the mold wall. In the second invention, since the shrinkage compensation curved surface is formed on all four sides of the mold wall, the heat removal amount for each side can be finely adjusted, and the difference in heat removal amount between the R inner surface and the R outer surface, By optimally adjusting the difference in heat removal amount between the outer surface and both side surfaces, it is possible to make the solidified shell thickness uniform around the entire circumference of the cast piece even if the cast piece has a small bending radius.
【０００７】[0007]
【実施例】つぎに、第１発明の実施例を図面に基づき説
明する。図１〜３は第１発明の各実施例の説明図であ
り、図１の（ａ）図は第１実施例の鋳型Ｍ１の縦断正面
図、（ｂ）図は縦断側面図、（ｃ）図は平面図、（ｄ）
図は底面図、図２は第２実施例の鋳型Ｍ２の平面図、図
３は第３実施例の鋳型Ｍ３の平面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the first invention will be described with reference to the drawings. 1 to 3 are explanatory views of the respective embodiments of the first invention, wherein FIG. 1 (a) is a vertical sectional front view of a mold M1 of the first embodiment, (b) is a vertical sectional side view, and (c). The figure is a plan view, (d)
The drawing is a bottom view, FIG. 2 is a plan view of the mold M2 of the second embodiment, and FIG. 3 is a plan view of the mold M3 of the third embodiment.
【０００８】（第１実施例）第１実施例の鋳型Ｍ１は図
１に示すように、鋳型壁１〜４の相対する２辺に収縮補
償曲面を形成したものである。図示の例では、Ｒ外面の
基準辺１とＲ内面の自由辺２（基準辺１と自由辺２は通
常長辺となるので、以下、長辺１，２ともいう）にテー
パーＴのみ付与した直線辺とし、両側辺３，４（両側辺
３，４は通常短辺となるので、以下、矩辺３，４ともい
う）に収縮補償曲面Ｃを形成している。この収縮補償曲
面Ｃは各辺の中央部を外側に膨出させるか、各辺の両端
部を内側に寄せることにより形成される。そして、この
収縮補償曲面Ｃを形成した収縮補償域Ｌは鋳型の上端か
ら下端に向けて途中まで形成されている。テーパーＴに
よる収縮補償量も収縮補償曲面Ｃによる収縮補償量も、
収縮補償領域Ｌの上端から下端に向けて低減している。
鋳型Ｍ１の下端部は収縮補償曲面が形成されていないの
で、各辺１〜４は直線辺となっている。本実施例の鋳型
では、長辺１，２のテーパーＴと短辺３，４の収縮補償
曲面Ｃによって、鋳片の凝固による収縮に鋳型壁が追随
してギャップが生じないようになっているが、長辺１，
２は直線辺であるので、加工が容易であり、維持管理も
容易である。例えば、全周に収縮補償曲面Ｃを加工する
場合に比べると、ＮＣテープ作成費で約１／３、工具の
機械加工は約１／２以下となる。(First Embodiment) As shown in FIG. 1, the mold M1 of the first embodiment has shrinkage compensating curved surfaces formed on two opposite sides of mold walls 1 to 4. In the illustrated example, only the taper T is given to the reference side 1 of the R outer surface and the free side 2 of the R inner surface (hereinafter, the reference side 1 and the free side 2 are usually long sides, and therefore, also referred to as the long sides 1 and 2 hereinafter). The contraction-compensating curved surface C is formed on both sides 3, 4 (both sides 3, 4 are usually short sides, so it is also referred to as rectangular sides 3, 4). The shrinkage compensation curved surface C is formed by bulging the central portion of each side outward or by bringing both end portions of each side inward. Then, the shrinkage compensation region L forming this shrinkage compensation curved surface C is formed partway from the upper end to the lower end of the mold. Both the shrinkage compensation amount by the taper T and the shrinkage compensation amount by the shrinkage compensation curved surface C are
The shrinkage compensation region L decreases from the upper end toward the lower end.
Since the shrinkage-compensating curved surface is not formed at the lower end of the mold M1, each side 1 to 4 is a straight side. In the mold of this embodiment, the taper T of the long sides 1 and 2 and the shrinkage compensating curved surface C of the short sides 3 and 4 prevent the mold wall from following the shrinkage due to the solidification of the slab, and thus no gap is generated. But long side 1,
Since 2 is a straight side, processing is easy and maintenance is also easy. For example, compared with the case where the shrinkage compensation curved surface C is machined all around, the NC tape production cost is about 1/3, and the machining of the tool is about 1/2 or less.
【０００９】（第２〜３実施例）第２実施例の鋳型Ｍ２
は図２に示すように、自由辺である長辺２に収縮補償曲
面Ｃを形成したものである。ただし、湾曲半径が小さい
鋳型では、鋳片がＲ内面側へ変位しがちであるので、収
縮補償曲面Ｃを設けない方が好ましい。第３実施例の鋳
型Ｍ３は、非湾曲側の２辺と、湾曲側の２辺のうちの１
辺に収縮補償曲面Ｃを形成するもので、図３は両短辺
３，４と自由辺側の長辺２に収縮補償曲面Ｃを形成した
ものである。上記の第２〜３実施例においては、いずれ
も直線辺が１〜３辺分残っているので、鋳型壁の作成は
容易である。(Second to Third Embodiments) The mold M2 of the second embodiment.
As shown in FIG. 2, the shrinkage compensation curved surface C is formed on the long side 2 which is the free side. However, in a mold having a small bending radius, the slab tends to be displaced to the R inner surface side, and therefore it is preferable not to provide the shrinkage compensation curved surface C. The mold M3 of the third embodiment has one of two sides on the non-curved side and two sides on the curved side.
The shrinkage compensation curved surface C is formed on the side, and in FIG. 3, the shrinkage compensation curved surface C is formed on both short sides 3 and 4 and the long side 2 on the free side. In each of the above-mentioned second to third embodiments, the straight-line side remains for one to three sides, so that it is easy to form the mold wall.
【００１０】（第１発明の他の実施例）前記第１〜３実
施例における収縮補償曲面Ｃの他の例として一定曲率加
工辺がある。この一定曲率加工辺とは、各辺の横断面形
状が曲面となっていても、図７に示すように、その曲率
半径ρが上下いずれのレベルにおいて同一であるものを
いう。この場合、半径ρを同一にしながら、曲面の深さ
δを下方に向って低減するため、半径ρの中心を下方に
向かって壁面から遠ざけながら加工すればよい。このよ
うに、半径ρが同一であると、その加工は直線辺に準じ
て容易に加工することができる。(Other embodiment of the first invention) Another example of the shrinkage compensation curved surface C in the first to third embodiments is a constant curvature processing side. The constant curvature processing side means that the radius of curvature ρ is the same at any of the upper and lower levels, as shown in FIG. 7, even if the cross-sectional shape of each side is a curved surface. In this case, in order to reduce the depth δ of the curved surface downward while keeping the radius ρ the same, it suffices to perform processing while moving the center of the radius ρ downward and away from the wall surface. Thus, if the radii ρ are the same, the processing can be easily performed according to the straight sides.
【００１１】つぎに、第２発明の実施例を図面に基づき
説明する。図４は第２発明の一実施例（第４実施例）の
説明図であり、（ａ）図は鋳型壁Ｍ４の縦断正面図、
（ｂ）図は縦断側面図、（ｃ）図は平面図、（ｄ）図は
底面図、（ｅ）図は収縮補償率の説明図、図５は第２発
明の他の実施例（第５実施例）の説明図であり、（ａ）
図は縦断正面図、（ｂ）図は縦断側面図、（ｃ）図は平
面図である。Next, an embodiment of the second invention will be described with reference to the drawings. FIG. 4 is an explanatory view of an embodiment (fourth embodiment) of the second invention, and FIG. 4 (a) is a vertical sectional front view of a mold wall M4,
(B) is a vertical side view, (c) is a plan view, (d) is a bottom view, (e) is an illustration of shrinkage compensation ratio, and FIG. 5 is another embodiment of the second invention ( 5 (a) is an explanatory view of FIG.
The figure is a vertical sectional front view, (b) is a vertical side view, and (c) is a plan view.
【００１２】（第４実施例）第４実施例の鋳型Ｍ４は図
４に示すように、鋳型壁４辺１〜４の全てに収縮補償曲
面Ｃを形成したものであり、長辺側１，２も短辺側３，
４も収縮補償領域Ｌは同じ長さである。ただし、各辺の
収縮補償率は相違している。短辺３，４の収縮補償率を
α、自由側長辺２の収縮補償率をβ、基準側長辺１の収
縮補償率をγとすると、α＞β＞γとするのが一例であ
る。そして、各収縮補償率α、β、γを細かく調整する
ことにより、鋳片全周の抜熱量を均一化でき、凝固シェ
ルの厚さをより均一にできる。また、鋳片全周で温度条
件が均一ならば、長辺の収縮が大きくなるので、そのよ
うな場合はα＜β＜γとすればよい。(Fourth Embodiment) As shown in FIG. 4, a mold M4 according to a fourth embodiment has shrinkage-compensating curved surfaces C formed on all four sides 1 to 4 of the mold wall. 2 also on the short side 3,
In 4 as well, the shrinkage compensation region L has the same length. However, the shrinkage compensation rate on each side is different. When the shrinkage compensation rate of the short sides 3 and 4 is α, the shrinkage compensation rate of the free side long side 2 is β, and the shrinkage compensation rate of the reference side long side 1 is γ, α>β> γ is an example. . By finely adjusting each shrinkage compensation rate α, β, γ, the amount of heat removed over the entire circumference of the slab can be made uniform, and the thickness of the solidified shell can be made more uniform. Further, if the temperature condition is uniform over the entire circumference of the slab, the contraction of the long side becomes large. In such a case, α <β <γ may be set.
【００１３】（第５実施例）第５実施例の鋳型Ｍ５は図
５に示すように、４辺１〜４の全てに収縮補償曲面Ｃを
形成したものであるが、収縮補償領域を異ならせたもの
である。図示の例では、短辺３，４側の収縮補償領域Ｌ
２が長辺１，２側の収縮補償領域Ｌ１より短くされてい
るが、収縮補償領域Ｌ１，Ｌ２の長さが反対であっても
よい。このように前記収縮補償率α、β、γの調整に加
え、または単独で収縮補償領域Ｌ１，Ｌ２を調整するこ
とにより、さらに抜熱量を微調整すれば、より一層、凝
固シェルの厚さを均一化することができ、とりわけ、鋳
片サイズの小さい鋳片の品質向上と操業の安定化に有効
である。(Fifth Embodiment) As shown in FIG. 5, the mold M5 of the fifth embodiment has shrinkage compensation curved surfaces C formed on all four sides 1 to 4, but the shrinkage compensation regions are different. It is a thing. In the illustrated example, the shrinkage compensation region L on the short sides 3 and 4 side
2 is shorter than the shrinkage compensation regions L1 on the long sides 1 and 2, the shrinkage compensation regions L1 and L2 may have opposite lengths. As described above, in addition to the adjustment of the shrinkage compensation ratios α, β and γ, or by adjusting the shrinkage compensation regions L1 and L2 independently, if the heat removal amount is further finely adjusted, the thickness of the solidified shell is further increased. It can be made uniform, and is particularly effective for improving the quality of a slab having a small slab size and stabilizing the operation.
【００１４】[0014]
【発明の効果】第１発明によれば、加工・成形が容易で
製造コストが低く、維持管理が容易な連続鋳造用鋳型を
提供することができる。第２発明によれば、湾曲半径が
小さい連続鋳造用鋳型であってもＲ内外の抜熱量を細か
く調整し、鋳片全周の凝固シェル厚を均一にし、鋳片品
質を向上させることができる。According to the first aspect of the present invention, it is possible to provide a continuous casting mold that is easy to process and mold, has a low manufacturing cost, and is easy to maintain. According to the second aspect of the present invention, even with a continuous casting mold having a small bending radius, it is possible to finely adjust the heat removal amount inside and outside R to make the solidified shell thickness uniform around the entire circumference of the slab and improve the slab quality. .
【図面の簡単な説明】[Brief description of the drawings]
【図１】第１発明の第１実施例の説明図であり、（ａ）
図は第１実施例の鋳型Ｍ１の縦断面正面図、（ｂ）図は
縦断側面図、（ｃ）図は平面図、（ｄ）図は底面図であ
る。FIG. 1 is an explanatory view of a first embodiment of the first invention, (a)
The figure is a vertical cross-sectional front view of the mold M1 of the first embodiment, (b) is a vertical side view, (c) is a plan view, and (d) is a bottom view.
【図２】第１発明の第２実施例の鋳型Ｍ２の平面図であ
る。FIG. 2 is a plan view of a mold M2 according to a second embodiment of the first invention.
【図３】第１発明の第３実施例の鋳型Ｍ３の平面図であ
る。FIG. 3 is a plan view of a mold M3 according to a third embodiment of the first invention.
【図４】第２発明の一実施例（第４実施例）の説明図で
あり、（ａ）図は鋳型Ｍ４の縦断正面図、（ｂ）図は縦
断側面図、（ｃ）図は平面図、（ｄ）図は底面図、
（ｅ）図は収縮補償率の説明図である。4A and 4B are explanatory views of an embodiment (fourth embodiment) of the second invention, in which (a) is a vertical front view of the mold M4, (b) is a vertical side view, and (c) is a plan view. Figure, (d) is bottom view,
(E) figure is an explanatory view of the shrinkage compensation rate.
【図５】第２発明の他の実施例（第５実施例）の説明図
であり、（ａ）図は縦断正面図、（ｂ）図は縦断側面
図、（ｃ）図は平面図である。5A and 5B are explanatory views of another embodiment (fifth embodiment) of the second invention, wherein FIG. 5A is a vertical sectional front view, FIG. 5B is a vertical sectional side view, and FIG. is there.
【図６】収縮補償率の定義の説明図である。FIG. 6 is an explanatory diagram of definition of shrinkage compensation rate.
【図７】一定曲率加工辺の説明図で、（ａ）は各辺の中
央部に形成している場合の説明図、（ｂ）は各辺の両端
の合せ部に形成している場合の説明図である。7A and 7B are explanatory views of a constant curvature processing side, where FIG. 7A is an explanatory view when the side is formed at the center of each side, and FIG. 7B is a description when the side is formed at both ends of each side. FIG.
【図８】曲率半径が小さい連続鋳造用鋳型の問題点の説
明図である。FIG. 8 is an explanatory diagram of a problem of a continuous casting mold having a small radius of curvature.
【符号の説明】 １ 基準辺（長辺） ２ 自由辺
（長辺） ３ 両側辺（短辺） ４ 両側辺
（短辺） Ｔ テーパー Ｃ 収縮補償
曲面 Ｌ，Ｌ１，Ｌ２ 収縮補償領域 Ｍ１ 鋳型 Ｍ２ 鋳型 Ｍ３ 鋳型 Ｍ４ 鋳型 Ｍ５ 鋳型[Explanation of reference symbols] 1 reference side (long side) 2 free side (long side) 3 both sides (short side) 4 both sides (short side) T taper C shrinkage compensation curved surface L, L1, L2 shrinkage compensation area M1 mold M2 Template M3 Template M4 Template M5 Template
Claims (6)
ーを有し、上端から下端に向け先細となるテーパーが付
与された連続鋳造用鋳型であって、該鋳型壁の横断面輪
郭を構成する４辺のうち、湾曲半径外側の基準辺を除く
他の辺に収縮補償曲面を形成し、残りの辺を収縮補償曲
面を形成しない直線辺としたことを特徴とする連続鋳造
用鋳型。1. A continuous casting mold having an open upper end and a lower end, a cylindrical cavity, and a taper tapering from the upper end to the lower end. A mold for continuous casting, characterized in that, out of the four sides constituting, a shrinkage-compensating curved surface is formed on the sides other than the reference side outside the bending radius, and the remaining sides are straight sides that do not form the shrinkage-compensating curved surface.
辺に直交する２辺に形成されていることを特徴とする請
求項１記載の連続鋳造用鋳型。2. The casting mold for continuous casting according to claim 1, wherein the shrinkage-compensating curved surface is formed on two sides that are orthogonal to the reference side on the outside of the radius of curvature.
外側の１辺を除く他の３辺に形成されていることを特徴
とする請求項１記載の連続鋳造用鋳型。3. The continuous casting mold according to claim 1, wherein the shrinkage-compensating curved surface is formed on three sides other than one side inside or outside the curvature radius.
ーを有し、上端から下端に向け先細となるテーパーが付
与された湾曲型の連続鋳造用鋳型であって、該鋳型壁の
横断面輪郭を構成する４辺の全てに収縮補償曲面を形成
し、該収縮補償曲面に基づく収縮補償率が、湾曲半径内
側の自由辺と、湾曲半径外側の基準辺と非湾曲側の両側
辺との間で相互に異なっていることを特徴とする連続鋳
造用鋳型。4. A curved-type continuous casting mold having a cylindrical cavity having an open upper end and a lower end, and a taper tapering from the upper end to the lower end. A shrinkage compensation curved surface is formed on all of the four sides forming the surface contour, and the shrinkage compensation rate based on the shrinkage compensation curved surface has a free side inside the bending radius, a reference side outside the bending radius and both sides on the non-curving side. A mold for continuous casting, characterized in that the two are mutually different.
自由辺の収縮補償率、前記基準辺の収縮補償率が、その
順で小さくなっていることを特徴とする請求項５記載の
連続鋳造用鋳型。5. The shrinkage compensation rate of both sides of the non-curved side, the shrinkage compensation rate of the free side, and the shrinkage compensation rate of the reference side decrease in that order. Continuous casting mold.
補償曲面を形成している上下方向の長さである曲面領域
と、前記両側辺において収縮補償曲面を形成している曲
面領域とが、互いに異なっていることを特徴とする請求
項６記載の連続鋳造用鋳型。6. A curved area having a vertical length that forms a shrinkage-compensated curved surface on the curved side free side and a reference side, and a curved-surface area that forms a shrinkage-compensated curved surface on both sides. The molds for continuous casting according to claim 6, wherein the molds are different from each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7186379A JP2993868B2 (en) | 1995-06-28 | 1995-06-28 | Continuous casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7186379A JP2993868B2 (en) | 1995-06-28 | 1995-06-28 | Continuous casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0910895A true JPH0910895A (en) | 1997-01-14 |
| JP2993868B2 JP2993868B2 (en) | 1999-12-27 |
Family
ID=16187365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7186379A Expired - Lifetime JP2993868B2 (en) | 1995-06-28 | 1995-06-28 | Continuous casting mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2993868B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100807569B1 (en) * | 2001-11-14 | 2008-02-28 | 주식회사 포스코 | Short side casting type to prevent surface defects near corners of cast steel during continuous casting |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101867738B1 (en) * | 2016-12-23 | 2018-06-15 | 주식회사 포스코 | Mold and Segment Structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5214687B2 (en) | 2010-09-09 | 2013-06-19 | 株式会社東芝 | Washing machine |
-
1995
- 1995-06-28 JP JP7186379A patent/JP2993868B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100807569B1 (en) * | 2001-11-14 | 2008-02-28 | 주식회사 포스코 | Short side casting type to prevent surface defects near corners of cast steel during continuous casting |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2993868B2 (en) | 1999-12-27 |
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