JPS5814030Y2 - Mold for steel ingots with warped ends - Google Patents

Description

【考案の詳細な説明】 本考案は端面反り付き鋳型の構造に関する。[Detailed explanation of the idea] The present invention relates to the structure of a mold with a curved end surface.

従来、特にダクタイル鋳鉄製の鋼塊用鋳型Ａ′について
は、その材質特性（普通鋳鉄に較べて伸びが大きい）か
ら溶鋼が注入されるたびに鋼塊用鋳型Ａ′内面が高温に
上げられ、鋼塊引き抜き後急冷されるサイクルの繰返し
によって第２図乃至第５図に示すような圧縮歪２を生じ
、徐々に大きくなる。Conventionally, the inner surface of the steel ingot mold A' was raised to a high temperature every time molten steel was injected, especially for the steel ingot mold A' made of ductile cast iron, which had a higher elongation than normal cast iron. By repeating the cycle of drawing the steel ingot and then rapidly cooling it, a compressive strain 2 as shown in FIGS. 2 to 5 is generated and gradually increases.

この圧縮歪が肉厚方向に５ｍｍ程度になると台盤との間
に溶鋼が流れ込んで鋼塊に鋳ばりを生ずるために、その
まま分塊圧延するとスラブのオーバーラップ疵（かぶれ
疵）の原因となる。When this compressive strain reaches approximately 5 mm in the wall thickness direction, molten steel will flow between the base plate and the steel ingot, creating flash in the ingot. If the slab is rolled as it is, it will cause overlap defects in the slab. .

疵取りのため直送圧延が不可能になる。Direct rolling becomes impossible due to the removal of defects.

また押湯枠上置式の鋼塊用鋳型の場合には上部にも圧縮
歪を生じ押湯枠との間に溶鋼が流れ込むため鋼塊に吊り
切れが生じやすい。In addition, in the case of a mold for steel ingots that is placed above the feeder frame, compressive strain occurs in the upper part as well, and molten steel flows between the mold and the feeder frame, making it easy for the steel ingot to break.

このような欠点があるため２０〜３０回或いは数１０回
使用のたびに圧縮歪２の生じた部分を肉盛溶接で埋めて
端面を平滑に修正するか、逆に歪を生じていない外面側
の部分を切削機械等によって削り取って平滑する方法が
採用されているが、何れも多大な費用と時間を要し、鋼
塊用鋳型の管理の問題点となっている。Because of these drawbacks, after each 20 to 30 or several dozen uses, the area where compressive strain 2 has occurred should be filled with overlay welding to make the end surface smooth, or conversely, the outer surface side where no distortion has occurred should be corrected. A method has been adopted in which the portion is smoothed by scraping it off with a cutting machine or the like, but these methods require a great deal of cost and time, and are problematic in the management of molds for steel ingots.

なお第１図は従来の鋼塊用鋳型Ａ′を示す縦断面図、第
２図は下端面の内面側に圧縮歪２を生じたときの長辺面
の縦断面図、第３図は下端面の内面側に縦方向の圧縮歪
２を生じたときのコーナ部の縦断面図、第４図は下端面
の内面側に縦方向の圧縮歪２を生じたときの短辺面の縦
断面図、第５図は下端面の内面側に縦方向の圧縮歪２を
生じたときの下面図であって、Ｗａ、Ｗｂ、Ｗｃは肉厚
方向の範囲、Ｔ、、 Ｔ、、 Ｔ、は上下方向の量であ
る。Figure 1 is a vertical cross-sectional view of a conventional mold A' for steel ingots, Figure 2 is a vertical cross-sectional view of the long side when compressive strain 2 is generated on the inner surface of the lower end surface, and Figure 3 is the lower A vertical cross-sectional view of the corner section when compressive strain 2 in the vertical direction is generated on the inner surface of the end surface, and FIG. Figure 5 is a bottom view when compressive strain 2 in the longitudinal direction is generated on the inner surface of the lower end surface, where Wa, Wb, and Wc are the ranges in the thickness direction, and T, T, and T are the ranges in the thickness direction. This is the amount in the vertical direction.

本考案は叙述の点に鑑みてなされたものであって、本考
案の目的とするところは肉盛溶接や機械加工等による修
正作業の時期を遅くらせることかでき鋳型廃却までの修
正回数を減らすことのできる端面反り付き鋼塊用鋳型を
提供するにある。The present invention has been developed in view of the above points, and the purpose of the present invention is to delay the time required for correction work such as overlay welding or machining, and to reduce the number of corrections required before the mold is discarded. The purpose of the present invention is to provide a mold for a steel ingot with end face warpage that can be reduced.

以下本考案を実施例により詳述する。The present invention will be explained in detail below using examples.

第６図は本考案の鋼塊用鋳型Ａの一実施例の長辺面の縦
断面図、第７図は同上のコーナ部の縦断面図、第８図は
同上の短辺面の縦断面図、第９図は同上の下面図を示し
、鋼塊用鋳型Ａは角筒状の鋳型本体１の下端面の外側面
に外端部程大きくなる反り３を設けて形成されている。Fig. 6 is a longitudinal sectional view of the long side of an embodiment of the steel ingot mold A of the present invention, Fig. 7 is a longitudinal sectional view of the corner portion of the same, and Fig. 8 is a longitudinal sectional view of the short side of the same. FIG. 9 shows a bottom view of the same as above, and the steel ingot mold A is formed by providing a curvature 3 on the outer surface of the lower end surface of the rectangular cylindrical mold body 1, which becomes larger toward the outer end.

このように反り３を設けてあると、内面側の圧縮歪２が
一定量を超えてその範囲が反り３を付けた部分に波及す
ると、第１０図に示すように歪の高さがＴ１からＴ２に
縮小される。If the warp 3 is provided in this way, when the compressive strain 2 on the inner surface exceeds a certain amount and its range spreads to the part where the warp 3 is attached, the height of the strain will rise from T1 as shown in Figure 10. It is reduced to T2.

ところで圧縮歪２の歪量及び歪範囲の下面における分布
を測定するとＴａ＞Ｔｂ＞Ｔｃ及びＷ、＞Ｗｂ＞Ｗｃと
いう傾向になっている。By the way, when the strain amount and the distribution of the strain range of compressive strain 2 on the lower surface are measured, the trends are Ta>Tb>Tc and W,>Wb>Wc.

これは各部の溶鋼からの熱影響の差異や鋳型構造の特質
によるものと考えられる。This is thought to be due to differences in the thermal effects from the molten steel in each part and the characteristics of the mold structure.

そこで端面に予しめ付ける反り３の量及び範囲をｔａ＜
ｔｂ＜ｔｃ及びＷａ＜ｗｂくＷｃという相対関係で、そ
れぞれの歪量及び歪範囲に反比例的に対応するように適
切に設定すると、圧縮歪２が反り３を付けた範囲に波及
した時点以後において下端面全体のレベルが均等に変化
し内面全周に歪縮小の効果を発揮することとなる。Therefore, the amount and range of the warp 3 to be pre-prepared on the end face is set to ta<
If the relative relationships of tb < tc and Wa < wb Wc are set appropriately to correspond inversely to the respective strain amounts and strain ranges, after the compressive strain 2 spreads to the warp 3 range, The level of the entire lower end surface changes uniformly, and the strain reduction effect is exerted all around the inner surface.

つまり第１１図ａ、ｌ）、ｃから明確なように下端面の
各部に想定される圧縮歪２の歪量及び歪範囲に応じた反
り３を予じめ付けておくことにより鋼塊用鋳型Ａがかな
り使用されて圧縮歪２が反り３を付けた範囲に波及した
時点以後には下端面全体のレベルが次第に上に移動する
ことになり実質上の歪量Ｔａｌ、Ｔｂ工、ＴＣＩより縮
小された残りの歪量Ｔ８□。In other words, as is clear from Fig. 11 a, l) and c, by pre-applying warpage 3 in each part of the lower end surface in accordance with the amount and strain range of compressive strain 2, a mold for steel ingots can be formed. After the point where A is used considerably and compressive strain 2 spreads to the range where warp 3 is applied, the level of the entire lower end surface gradually moves upwards, and the actual amount of strain is reduced from Tal, Tb, and TCI. The remaining distortion amount T8□.

Ｔｂ２．’Ｉ’Ｃ２が台盤との隙間となる。Tb2. 'I'C2 becomes the gap between it and the base plate.

ここで１１は使用初期のレベル、１２は端面の圧縮歪２
が増大したときのレベルであって、Ｔ８．Ｔｂ、Ｔｃ及
びＷ８．Ｗ、、Ｗ。Here, 11 is the level at the initial stage of use, and 12 is the compressive strain 2 of the end face.
The level at which T8. Tb, Tc and W8. W,,W.

に反比例するｔ８＜ ｔ、＜ ｔｃ及びｗａ＜ｗｂ＜ｗ
ｃの関係になっていると１１と１２のレベル差△ｌは各
部において略一定になる。t8 < t, < tc and wa < wb < w
If the relationship is as shown in c, the level difference Δl between 11 and 12 will be approximately constant in each part.

また第１２図ａ、ｌ）は上述の実施例の具体的な鋼塊用
鋳型Ａの半断面図及び下面図を示し、４は吊り部、５は
注湯口、６はキー止めである。Further, FIGS. 12a and 12l) show a half-sectional view and a bottom view of the concrete mold A for steel ingots of the above-described embodiment, where 4 is a hanging part, 5 is a pouring spout, and 6 is a key stop.

このように構成せる本考案の端面反り付き鋼塊用鋳型は
鋼塊用鋳型全般に用いることができ、特にダクタイル鋳
鉄の鋳型及び鋼塊重量５トン以上の大型鋳型に有効であ
る。The mold for steel ingots with a warped end according to the present invention having the above structure can be used for all kinds of molds for steel ingots, and is particularly effective for ductile cast iron molds and large molds weighing 5 tons or more of steel ingots.

また第１３図、第１４図に示すように押湯枠上置式の鋼
塊用鋳型Ａの場合は下端面のみでなく上端面にも圧縮歪
２が生じるので、前述の実施例で述べた反り３の付は方
をそのまま上端面に適用すると下端面と同様の効果があ
る。In addition, as shown in Figs. 13 and 14, in the case of mold A for steel ingots with a feeder frame mounted above, compressive strain 2 occurs not only on the lower end face but also on the upper end face, so that the warping described in the previous example is caused. If the method of attachment 3 is applied directly to the upper end surface, the same effect as that of the lower end surface will be obtained.

ここで７は押湯枠、８は台盤、９は溶鋼である。Here, 7 is a riser frame, 8 is a base plate, and 9 is molten steel.

また圧縮歪２の量や各部の分布に応じて第１５図に示す
ようにコーナ部と短辺面とに反り３を設けたり、第１６
図に示すようにコーナ部のみに反り３を設けてもよい。In addition, depending on the amount of compressive strain 2 and the distribution of each part, a curvature 3 may be provided on the corner portion and the short side surface as shown in FIG.
As shown in the figure, the warp 3 may be provided only at the corner portion.

ここでクロスハツチングの部分が反り３の範囲を示す。Here, the cross-hatched area indicates the range of warp 3.

なお−上述の実施例では鋼塊の断面が長方形のいわゆる
扁平鋳型（最も歪が大きい形状）を対象にしたが、いわ
ゆる角型（正方形断面）や１型においても同様の考え方
で予じめ反り３を付ければ同様の効果がある。In addition, in the above-mentioned example, the steel ingot had a rectangular cross section, so-called flat mold (shape with the largest distortion), but so-called rectangular mold (square cross section) and mold 1 can also be warped using the same concept. Adding 3 will have the same effect.

なおまた反り３の付いた面は第６図乃至第８図に示すよ
うな平面であっても、第１７図に示すような凸曲面であ
っても、第１８図に示すような凹曲面で゛あってもよい
。Furthermore, the surface with the curvature 3 may be a flat surface as shown in Figs. 6 to 8, a convex curved surface as shown in Fig. 17, or a concave curved surface as shown in Fig. 18. There may be.

本考案は叙述の如く使用により内面側に生じる圧縮歪の
量及び範囲の最も大きい長辺部の中央の反り量及び範囲
を最小に、圧縮歪の量及び範囲の最も小さいコーナ部の
反りの量及び範囲を最大にするように使用により内面側
に生じる圧縮歪の量及び範囲に反比例して外面側の反り
の量及び範囲を各部で変化させたので、圧縮歪の量及び
範囲の大きい部分は反りまでの到達距離が長く圧縮歪の
小さい部分は反りまでの到達距離が短かく各部とも略同
時に圧縮歪が到達するものであり、がなり使用されて圧
縮歪が反りを付けた部分に波及した時点から以後端面全
体のレベルが均一に（平行な水平面で）移動し、実質的
な歪の量より縮小された量しか台盤との間に隙間を生じ
ないものであって、肉盛溶接１機械加工等による修正作
業の時期を遅らせることができ、鋳型廃却までの修正回
数を減らすことができるという利点がある。As stated above, the present invention minimizes the amount and range of warpage at the center of the long side, where the amount and range of compressive strain that occurs on the inner surface is the largest, and the amount of warp at the corners, where the amount and range of compressive strain is the smallest. The amount and range of warpage on the outer surface side was varied in inverse proportion to the amount and range of compressive strain generated on the inner surface side due to use in order to maximize the amount and range of compressive strain. The distance to the warp is long and the compressive strain is small in the part where the reach to the warp is short and the compressive strain reaches each part almost at the same time. The level of the entire end face moves uniformly (in a parallel horizontal plane) from this point onward, and only an amount of gap between the base plate and the base plate is created that is smaller than the actual amount of distortion, and overlay welding 1 This has the advantage that the timing of correction work such as machining can be delayed, and the number of corrections before discarding the mold can be reduced.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来の鋼塊用鋳型の縦断面図、第２図は下端面
の内面側に縦方向の圧縮歪を生じたときの長辺面の縦断
面図、第３図は下端面の内面側に縦方向の圧縮歪を生じ
たときのコーナ部の縦断面図、第４図は下端面の内面側
に縦方向の圧縮歪を生じたときの短辺面の縦断面図、第
５図は下端面の内面側に縦方向の圧縮歪を生したときの
下面図、第６図は本考案の鋼塊用鋳型の一実施例の長辺
面の縦断面図、第７図は同上のコーナ部の縦断面図、第
８図は同上の短辺面の縦断面図、第９図は同上の下面図
、第１０図は同上の圧縮歪と反りとのパターンを示す説
明図、第１１図ａ、ｌ）、ｃは同上の各部における端面
のレベルの変化を示す説明図、第１２図ａ、ｌ）は同上
の具体的な鋼塊用鋳型の正面から見た半断面図及び下面
図、第１３図は本考案の他の実施例を説明するための押
湯枠上置式の鋼塊用鋳型を示す縦断面図、第１４図は同
上のＸ部拡大断面図、第１５図、第１６図は同上の他の
実施例の下面図、第１７図、第１８図は同上の他の反り
の形状を示す縦断面図であって、１は鋳型本体、２は圧
縮歪、３は反りである。Figure 1 is a longitudinal sectional view of a conventional mold for steel ingots, Figure 2 is a longitudinal sectional view of the long side when longitudinal compressive strain is generated on the inner surface of the lower end face, and Figure 3 is a longitudinal sectional view of the lower end face. Fig. 4 is a vertical cross-sectional view of the corner portion when longitudinal compressive strain is generated on the inner surface side, Fig. 4 is a longitudinal cross-sectional view of the short side surface when longitudinal compressive strain is generated on the inner side of the lower end surface The figure is a bottom view when longitudinal compressive strain is produced on the inner surface of the lower end surface, FIG. 6 is a longitudinal cross-sectional view of the long side of an embodiment of the steel ingot mold of the present invention, and FIG. 7 is the same as above. 8 is a vertical sectional view of the short side of the same, FIG. 9 is a bottom view of the same, FIG. 10 is an explanatory diagram showing the pattern of compressive strain and warpage of the above, Figures 11 a, l) and c are explanatory diagrams showing changes in the level of the end face in each part of the same as above, and Figure 12 a, l) are half-sectional views and bottom views of the concrete mold for steel ingots as seen from the front. 13 is a vertical sectional view showing a mold for steel ingots mounted on a riser frame for explaining another embodiment of the present invention, FIG. 14 is an enlarged sectional view of the same section X, and FIG. FIG. 16 is a bottom view of another embodiment of the same as above, and FIGS. 17 and 18 are longitudinal sectional views showing other warped shapes of the same as above, 1 is a mold body, 2 is a compressive strain, and 3 is a It is warped.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 断面長方形状の鋳型本体の上端面または下端面の外面側
に反りを付けた端面反り付き鋼塊用鋳型において、使用
により内面側に生じる圧縮歪の量及び範囲の最も大きい
長辺部の中央の反りの量及び範囲を最小に、圧縮歪の量
及び範囲の最も小さいコーナ部の反りの量及び範囲を最
大にするように使用により内面側に生じる圧縮歪の量及
び範囲に反比例して外面側の反りの量及び範囲を各部で
変化させたことを特徴とする端面反り付き鋼塊用鋳型。In a mold for a steel ingot with a curved end face, in which the upper or lower end face of the mold body has a rectangular cross-section and is warped on the outer side, the center of the long side where the amount and range of compressive strain that occurs on the inner side due to use is greatest. In order to minimize the amount and range of warpage and maximize the amount and range of warpage at the corner where the amount and range of compressive strain is smallest, A mold for a steel ingot with a warped end, characterized in that the amount and range of warp are varied in each part.