JPH0252580B2 - - Google Patents
Info
- Publication number
- JPH0252580B2 JPH0252580B2 JP59170394A JP17039484A JPH0252580B2 JP H0252580 B2 JPH0252580 B2 JP H0252580B2 JP 59170394 A JP59170394 A JP 59170394A JP 17039484 A JP17039484 A JP 17039484A JP H0252580 B2 JPH0252580 B2 JP H0252580B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- slab
- short side
- view
- short
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005266 casting Methods 0.000 claims description 9
- 238000009749 continuous casting Methods 0.000 claims description 6
- 229910000677 High-carbon steel Inorganic materials 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0406—Moulds with special profile
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、連続鋳造の１次冷却に使用する鋳型
の形状に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the shape of a mold used for primary cooling in continuous casting.
従来の技術
従来スラブ連鋳機における１次冷却用鋳型は、
長辺面および短辺面とも内部水冷をほどこした平
板で構成される組立て鋳型が主流となつている。Conventional technology The primary cooling mold in a conventional continuous slab casting machine is
Prefabricated molds consisting of flat plates with internal water cooling on both the long and short sides have become mainstream.
その場合、第４図に示すように鋳型短辺面２，
２は鋳片の収縮に合せて鋳型内の下方へ行く程、
鋳型短辺面同志を狭める所謂テーパーをつける事
が必要となつている。 In that case, as shown in FIG.
2, as the slab shrinks, the further down the mold it goes,
It is now necessary to create a so-called taper that narrows the short sides of the mold.
鋳片の凝固の進展に伴ない下端へ行く程鋳片の
収縮が起こるので向い合う鋳型短辺の間隔を上下
で等しくとると、鋳型短辺面と鋳片との間にギヤ
ツプが生じる結果となる。 As the slab solidifies, the slab shrinks toward the bottom, so if the spacing between the opposing short sides of the mold is equal on the top and bottom, a gap will occur between the short sides of the mold and the slab. Become.
そのギヤツプが熱抵抗となつて、溶鋼から鋳型
内の冷却水間で熱流束を減じ、結果として鋳片表
面の温度上昇につながり、クリープが大となり、
鋳片の短辺面に内部からの溶鋼静圧によるバルジ
ングが生じる。 This gap acts as a thermal resistance, reducing the heat flux between the molten steel and the cooling water in the mold, resulting in an increase in temperature on the surface of the slab, which increases creep.
Bulging occurs on the short side of the slab due to the static pressure of molten steel from inside.
バルジングが起きると鋳片に変形が生じ、特に
曲げモーメントが最も大きくかかるコーナー部に
縦割れを生じ易くなり、高炭素鋼（Ｃ≧1.0％）
等高温における延性の低い鋼種では鋳造中ブレー
クアウトにつながり、大きな操業事故の原因とな
る。その為短辺面には、例えば鋳型寸法が250×
300の場合で、片側２〜８mm程度のテーパーをつ
けて、鋳片が凝固収縮しても、極端なギヤツプが
鋳型短辺面と鋳片間に生じないようにする方法が
一般的に行なわれている。 When bulging occurs, the slab is deformed, and vertical cracks are likely to occur especially at the corners where the bending moment is greatest.
Steel types with low ductility at constant high temperatures can lead to breakouts during casting, causing major operational accidents. Therefore, for example, the mold size is 250× on the short side.
300, the common method is to add a taper of about 2 to 8 mm on one side to prevent an extreme gap from forming between the short side of the mold and the slab even if the slab solidifies and shrinks. ing.
発明が解決しようとする問題点
しかし、この方法では鋳型の下方へ行く程、鋳
片のコーナー部が外殻（以下シエルと言う）の形
成に伴ない強度を持つ事によつて、鋳型面との間
で強い固体摩擦を起こし、結果的に鋳型短辺面の
下方の角に偏摩耗が生じ、これが鋳型の寿命を縮
める大きな要因となつていた。Problems to be Solved by the Invention However, in this method, the corner portions of the slab become stronger due to the formation of an outer shell (hereinafter referred to as shell), and as they go further down the mold, the corner portions of the slab become stronger and the surface of the slab becomes closer to the mold surface. This causes strong solid friction between the molds, resulting in uneven wear on the lower corners of the short sides of the mold, which is a major factor in shortening the life of the mold.
又〔Ｃ〕≧1.0％を超える高炭素鋼を鋳造する場
合、凝固の進展に伴ない鋳片の短辺面に凹みが生
ずる。これを第５図により説明する。 Furthermore, when casting high carbon steel containing [C]≧1.0%, dents are formed on the short sides of the slab as solidification progresses. This will be explained with reference to FIG.
第５図ａは高炭素鋼鋳造中の立面の断面図であ
り、第５図ｂは第５図ａのＡ−Ａ端面、第５図ｃ
は第５図ａのＢ−Ｂ端面である。図中１は鋳型長
辺面、２は鋳型短辺面、３はノズル、４は凝固
殻、５は未凝固部、６は間隙である。 Figure 5a is a cross-sectional view of the elevation during casting of high carbon steel, Figure 5b is the A-A end face of Figure 5a, Figure 5c is
is the BB end face in FIG. 5a. In the figure, 1 is the long side surface of the mold, 2 is the short side surface of the mold, 3 is the nozzle, 4 is the solidified shell, 5 is the unsolidified part, and 6 is the gap.
鋳型短辺面の高さ方向上部では、第５図ｂに示
すように凝固殻４と鋳型短辺面２は密着した状態
であるが、下部では第５図ｃに示すように凝固殻
４の中央部に凝固収縮によるふくらみが生じる。 At the upper part of the mold short side surface in the height direction, the solidified shell 4 and the mold short side surface 2 are in close contact with each other, as shown in FIG. 5b, but at the bottom, as shown in FIG. 5c, the solidified shell 4 A bulge occurs in the center due to coagulation contraction.
このため巾方向直線で形成された短辺面をもつ
鋳型を使用する限りにおいては、いくらテーパー
を大きくしても、鋳片のふくらみ部と鋳型短辺面
との間に間隙６が生じる。その為、シエルの表面
温度が上がつて、溶鋼静圧により、シエルが鋳型
短辺面へ押しつけられ、鋳片の変形による歪がシ
エルに生じて、高炭素鋼の高温延性が低い事か
ら、鋳片の短辺面に縦割れが発生する。又、縦割
れの程度が悪性の場合は、縦割れの発生した場所
から溶鋼が噴出し、所謂ブレークアウトが起きる
頻度が高かつた。 Therefore, as long as a mold with a short side surface formed by a straight line in the width direction is used, no matter how large the taper is, a gap 6 will be created between the bulge of the slab and the short side surface of the mold. As a result, the surface temperature of the shell increases, and the shell is pressed against the short side of the mold by the static pressure of the molten steel, causing strain in the shell due to the deformation of the slab, and the high-temperature ductility of high carbon steel is low. Vertical cracks occur on the short side of the slab. In addition, when the degree of vertical cracking is malignant, molten steel gushes out from the location where the vertical cracking occurs, and so-called breakout occurs frequently.
このような問題に対する解決策として従来提案
されているものに特公昭54−42663号がある。該
技術は、鋳型の短辺面中央部を凸状とするもので
あるが、鋳型の高さ方向については何ら考慮され
ておらず、高さ方向は一律に上端から下端までそ
の断面が同一であり、前述第５図ｂにて説明した
ように鋳型上部においては鋳片の凝固収縮が少な
く、鋳型短辺面を凸状とするのは不都合である。 Japanese Patent Publication No. 54-42663 has been proposed as a solution to this problem. This technique makes the center of the short side of the mold convex, but no consideration is given to the height direction of the mold, and the cross section is uniformly the same from the top to the bottom in the height direction. However, as explained above with reference to FIG. 5B, there is little solidification shrinkage of the slab in the upper part of the mold, so it is inconvenient to make the short sides of the mold convex.
この点に鑑み、本発明は、鋳型短辺面の下部
に、より大きなふくらみ（バルジ）を持たせる事
により、短辺側の鋳型下部のエツジ部の偏摩耗を
軽減し、鋳型の寿命を延長させると共に、高炭素
鋼（〔Ｃ〕≧1.0％）鋳造時に鋳片短辺面に生じる
縦割れ及びブレークアウトを防止する事を目的と
している。 In view of this, the present invention provides a larger bulge at the bottom of the short side of the mold to reduce uneven wear on the edge of the bottom of the mold on the short side and extend the life of the mold. The purpose is to prevent vertical cracks and breakouts that occur on the short sides of slabs during casting of high carbon steel ([C]≧1.0%).
問題点を解決するための手段
すなわち、本発明の要旨とするところは、連続
鋳造における鋳型短辺の水平断面形状において、
鋳片側が、上方においては略直線状であり、下方
において次第に突出量を増大した円弧状のふくら
みを呈するように形成したことを特徴とする連続
鋳造用鋳型にあり、鋳片と鋳型の間に生ずる隙間
６を近似的に埋めるような突出した形状を形成し
たものである。Means for Solving the Problems That is, the gist of the present invention is that in the horizontal cross-sectional shape of the short side of the mold in continuous casting,
A continuous casting mold is characterized in that the casting side is formed in a substantially linear shape upwardly and exhibits an arc-shaped bulge with a protruding amount that gradually increases downwardly, and there is a gap between the slab and the mold. A protruding shape is formed to approximately fill the gap 6 that occurs.
以下図面により説明する。 This will be explained below with reference to the drawings.
本発明による連続鋳造用鋳型短辺の形状の実施
例を第１図〜第３図に示す。 Examples of the shape of the short side of a continuous casting mold according to the present invention are shown in FIGS. 1 to 3.
第１図に示す鋳型短辺面２は、その上端におい
てはその平面が矩形であるが、下端に近づく程巾
方向中央にふくらみを持つ事を特色としている。
第２図ａは側面図、第２図ｂは正面図、第２図ｃ
は下端々面の図である。第３図は第２図ａのＣ−
Ｃ切断部端面である。下端のふくらみ部は平面で
みたとき、第２図ｃに示すごとく鋳型内側が円弧
となるようにとり、その半径R0（mm）は、
R0＝（ｄ／４）2＋δ0 2／2δ0
ｄ：鋳型短辺の幅（mm）
δ0：鋳型短辺下端のふくらみ（mm）
となるように設定する。同時に、鋳片と接する鋳
型短辺面の上端から下端に至る範囲の水平断面に
おける形状は同じく円孤となるようにとり、その
円の半径Ｒ（mm）は、
Ｒ＝（ｄ／４）2＋x2／l2・δ0 2／２・ｘ／ｌ・δ0
ｘ：モールド上端からの距離（mm）
ｌ：鋳型短辺の長さ（mm）
となるように設定する。尚上記に説明した円弧は
基本的な形状を説明したものであり、本発明はこ
れに近似するものも有効であり、それらも本発明
に含むものである。 The short side surface 2 of the mold shown in FIG. 1 has a rectangular plane at its upper end, but is characterized by a bulge at the center in the width direction as it approaches the lower end.
Figure 2 a is a side view, Figure 2 b is a front view, Figure 2 c
is a bottom-to-bottom view. Figure 3 shows C- in Figure 2a.
C is the end face of the cut portion. When the bulge at the lower end is viewed from above, the inside of the mold forms an arc as shown in Figure 2c, and its radius R 0 (mm) is R 0 = (d/4) 2 + δ 0 2 /2δ 0 d: Width of the short side of the mold (mm) δ 0 : Swelling of the lower end of the short side of the mold (mm). At the same time, the shape of the horizontal cross section of the range from the top to the bottom of the short side of the mold in contact with the slab is the same as a circular arc, and the radius R (mm) of the circle is R = (d/4) 2 +x 2 /l 2・δ 0 2 /2・x/l・δ 0 x: Distance from the upper end of the mold (mm) l: Length of the short side of the mold (mm). Note that the above-described circular arc describes the basic shape, and the present invention is also effective with shapes that approximate this, and these are also included in the present invention.
作 用
これにより鋳型短辺の鋳片と接する面は、円滑
な曲面で構成する事ができ、鋳片の収縮に伴なう
鋳片短辺部の凹みと鋳型短辺表面との間に生じる
隙間を抑制する事が可能となり、高炭素鋼（〔Ｃ〕
≧1.0％）に発生するコーナー短辺部の縦割れの
発生を防止する事ができる。又、鋳型短辺面下方
のエツジ部の偏摩耗を防止し、鋳型の寿命を従来
の平面で構成される鋳型に比較して大幅に延長さ
せる事が可能となる。Effect: As a result, the surface of the short side of the mold that comes into contact with the slab can be configured with a smooth curved surface, which occurs between the dent on the short side of the mold and the surface of the short side of the mold due to shrinkage of the slab. It is possible to suppress gaps, and high carbon steel ([C]
≧1.0%) can prevent the occurrence of vertical cracks on the short side of the corner. In addition, it is possible to prevent uneven wear of the lower edge portion of the short side of the mold, and to significantly extend the life of the mold compared to a conventional mold constructed of flat surfaces.
発明の効果
第６図に本発明による鋳型を高炭素鋼スラブに
適用した場合の高炭素鋼短辺面に発生する縦割れ
の低減効果を、従来の短辺が平面で構成される鋳
型を使用した場合と比較して示した。Effects of the Invention Figure 6 shows the effect of reducing vertical cracks that occur on the short sides of high carbon steel when the mold according to the present invention is applied to a high carbon steel slab using a conventional mold with flat short sides. A comparison is shown below.
図から明らかなように、鋳片短辺面の縦割れの
発生が大幅に抑制されている。 As is clear from the figure, the occurrence of vertical cracks on the short sides of the slab is significantly suppressed.
又第７図に本発明による鋳型をステンレス鋼お
よび高炭素鋼スラブに、適用した場合の鋳型寿命
の延長効果を、従来の短辺が平面で構成される鋳
型を使用した場合と比較して示した。両者の鋳型
とも鋳型下端は鋳片と接する面に２mmの厚みの
Niメツキをほどこしており、鋳型下端のエツジ
部のNiメツキが損耗し、鋼板が露出するまで使
用し、それまでの鋳造チヤージ数をもつて鋳型寿
命とした。図から明らかなように本発明による鋳
型の寿命が従来の鋳型に比較して５割程度向上し
ていることがわかる。 Furthermore, Fig. 7 shows the effect of extending the life of the mold when the mold according to the present invention is applied to stainless steel and high carbon steel slabs, in comparison with the case where a conventional mold with flat short sides is used. Ta. The lower end of both molds has a 2mm thick layer on the surface that contacts the slab.
The mold was plated with Ni, and the mold was used until the Ni plating on the edge at the bottom of the mold wore out and the steel plate was exposed, and the mold life was determined by the number of casting charges up to that point. As is clear from the figure, the life of the mold according to the present invention is improved by about 50% compared to the conventional mold.
第１図は本発明鋳型の上面図、第２図ａ，ｂ、
及びｃは本発明鋳型のふくらみの説明図、第３図
は第２図ａのＣ−Ｃ線切断部端面図、第４図は従
来の鋳型の説明図で、ａは平面図、ｂは立面図、
第５図は鋳造中における鋳片短辺面の凹み形成の
説明図で、ａは立面断面図、ｂはａにおけるＡ−
Ａ線切断部端面図、ｃはＢ−Ｂ線切断部端面図、
第６図は従来の鋳型と本発明鋳型の鋳片短辺縦割
れの発生率を比較した図、第７図は従来の鋳型と
本発明鋳型の鋳型短辺面の寿命を比較した図であ
る。
１……鋳型長辺面、２……鋳型短辺面、３……
ノズル、４……凝固殻、５……未凝固部、６……
間隙。
Fig. 1 is a top view of the mold of the present invention, Fig. 2 a, b,
and c are explanatory views of the bulge of the mold of the present invention, Fig. 3 is an end view of the section cut along the line CC in Fig. 2 a, and Fig. 4 is an explanatory view of the conventional mold, where a is a plan view and b is an upright view. side view,
Fig. 5 is an explanatory view of the formation of depressions on the short side of the slab during casting, where a is an elevational sectional view and b is an A--
A line cut section end view, c is a B-B line cut section end view,
Figure 6 is a diagram comparing the occurrence rate of vertical cracking on the short side of the slab between a conventional mold and the mold of the present invention, and Figure 7 is a diagram comparing the life of the short side of the mold between the conventional mold and the mold of the present invention. . 1...Mold long side surface, 2...Mold short side surface, 3...
Nozzle, 4... Solidified shell, 5... Unsolidified part, 6...
gap.
Claims (1)
おいて、鋳片側が、上方においては略直線状であ
り、下方において次第に突出量を増大した円弧状
のふくらみを呈するように形成したことを特徴と
する連続鋳造用鋳型。1. Continuous casting characterized in that, in the horizontal cross-sectional shape of the short side of the mold in continuous casting, the cast side is formed in such a way that it is approximately linear in the upper part and exhibits an arc-shaped bulge with a gradually increasing protrusion in the lower part. Casting mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17039484A JPS6149751A (en) | 1984-08-17 | 1984-08-17 | Mold for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17039484A JPS6149751A (en) | 1984-08-17 | 1984-08-17 | Mold for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6149751A JPS6149751A (en) | 1986-03-11 |
| JPH0252580B2 true JPH0252580B2 (en) | 1990-11-14 |
Family
ID=15904111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17039484A Granted JPS6149751A (en) | 1984-08-17 | 1984-08-17 | Mold for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6149751A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT404235B (en) * | 1995-04-18 | 1998-09-25 | Voest Alpine Ind Anlagen | CONTINUOUS CHOCOLATE |
| JP4081963B2 (en) | 2000-06-30 | 2008-04-30 | セイコーエプソン株式会社 | Storage device and access method for storage device |
| EP2292350A1 (en) * | 2009-08-04 | 2011-03-09 | Siemens VAI Metals Technologies S.r.l. | Mould for continous casting of long or flat products, cooling jacket designed to cooperate with such a mould and assembly comprising such a mould and such cooling jacket |
| CN113857444A (en) * | 2021-10-10 | 2021-12-31 | 秦皇岛瀚丰长白结晶器有限责任公司 | High-pulling-speed crystallizer suitable for producing plain carbon steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5653849A (en) * | 1979-10-08 | 1981-05-13 | Kawasaki Steel Corp | Continuous casting method of steel slab of less surface defects |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50108915U (en) * | 1974-02-19 | 1975-09-05 |
-
1984
- 1984-08-17 JP JP17039484A patent/JPS6149751A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5653849A (en) * | 1979-10-08 | 1981-05-13 | Kawasaki Steel Corp | Continuous casting method of steel slab of less surface defects |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6149751A (en) | 1986-03-11 |
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