JPH04266462A - Dummy sheet in twin roll type strip continuous casting - Google Patents
Dummy sheet in twin roll type strip continuous castingInfo
- Publication number
- JPH04266462A JPH04266462A JP2596191A JP2596191A JPH04266462A JP H04266462 A JPH04266462 A JP H04266462A JP 2596191 A JP2596191 A JP 2596191A JP 2596191 A JP2596191 A JP 2596191A JP H04266462 A JPH04266462 A JP H04266462A
- Authority
- JP
- Japan
- Prior art keywords
- slab
- dummy sheet
- thin
- casting
- twin
- 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.)
- Pending
Links
- 238000009749 continuous casting Methods 0.000 title description 3
- 239000002184 metal Substances 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 37
- 238000005266 casting Methods 0.000 claims abstract description 23
- 239000012779 reinforcing material Substances 0.000 claims abstract description 21
- 238000010586 diagram Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 238000004804 winding Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005524 ceramic coating Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 229910020637 Co-Cu Inorganic materials 0.000 description 1
- 229910002549 Fe–Cu Inorganic materials 0.000 description 1
- 229910018106 Ni—C Inorganic materials 0.000 description 1
- 229910000711 U alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】［産業上の利用分野］本発明は双ロール式
薄板連続鋳造による薄板鋳片の製造に関する。[Industrial Field of Application] The present invention relates to the production of thin plate slabs by continuous twin-roll thin plate casting.
【０００２】0002
【従来の技術】双ロール式薄板連続鋳造によると、厚さ
が１〜３ｍｍの薄い金属薄板の鋳片が得られる。従って
圧延が困難な金属の薄板が製造できる。また圧延によっ
て更に薄い金属薄板を製造する際は、圧下量が少ないた
めに圧延工程を大幅に簡易化できる。BACKGROUND OF THE INVENTION Twin-roll continuous sheet metal casting produces thin metal sheet slabs with a thickness of 1 to 3 mm. Therefore, thin metal sheets that are difficult to roll can be manufactured. Furthermore, when producing a thinner metal sheet by rolling, the rolling process can be greatly simplified because the reduction amount is small.
【０００３】図５は、双ロール式薄板連続鋳造機を用い
た鋳片の製造の説明図である。図５（Ａ）で溶湯５は、
矢印８方向に回転する双ロール１−１，１−２と側堰１
７で形成される湯溜り２に注入する。溶湯は双ロールで
冷却されて凝固シェル３−１，３−２を形成する。この
凝固シェル３−１と３−２は合体し、鋳片６となって、
双ロールの最小間隙部４から取り出される。FIG. 5 is an explanatory diagram of the production of slabs using a twin-roll type continuous thin plate casting machine. In FIG. 5(A), the molten metal 5 is
Twin rolls 1-1, 1-2 rotating in the direction of arrow 8 and side weir 1
Inject into the pool 2 formed in step 7. The molten metal is cooled by twin rolls to form solidified shells 3-1 and 3-2. These solidified shells 3-1 and 3-2 are combined to form a slab 6,
It is taken out from the minimum gap part 4 of the twin rolls.
【０００４】凝固シェル３−１と３−２は、最小間隙部
４近傍で合体せしめる。図５（Ｂ）は凝固シェル３−１
と３−２が、最小間隙部４に至る前の７で合体した例で
ある。７で合体すると厚さがｔ１よりも大きいｔ２ｍｍ
の厚さに合体するが、厚さがｔ２ｍｍの凝固部を、ｔ２
ｍｍよりも狭いｔ１ｍｍの双ロール最小間隙部を通過さ
せる定常作業は容易ではない。The solidified shells 3-1 and 3-2 are brought together near the minimum gap 4. Figure 5(B) shows the solidified shell 3-1.
This is an example in which 3-2 and 3-2 are combined at 7 before reaching the minimum gap 4. When combined at 7, the thickness is t2mm, which is larger than t1.
However, the solidified part with a thickness of t2 mm is
It is not easy to perform routine work to pass through the minimum gap between the two rolls, which is t1 mm, which is narrower than mm.
【０００５】以上述べた如く、双ロール式薄板連続鋳造
機では、凝固シェルを最小間隙部４で合体させるため、
最小間隙部４の直前では、鋳片の板厚の中心は溶融状態
にある。従って最小間隙部４から出た直後の鋳片６には
液体状態のミクロ偏析が散在しかつ極めて高温である。
このため極めて脆弱である。As mentioned above, in the twin-roll type continuous thin plate casting machine, in order to combine the solidified shells at the minimum gap 4,
Immediately before the minimum gap 4, the center of the thickness of the slab is in a molten state. Therefore, immediately after coming out of the minimum gap 4, the slab 6 is scattered with micro-segregation in a liquid state and is at an extremely high temperature. This makes it extremely vulnerable.
【０００６】図６は、製造した鋳片６を捲取機９に搬送
する走路の例である。図６（Ａ）はループ１０を形成し
た後で巻取る例である。この際ループ１０の鋳片６の自
重は、最小間隙部４の直下の鋳片部にかゝる。しかし既
に述べた如く、最小間隙部４の直下の鋳片は極めて脆弱
である。従って最小間隙部４の直下の鋳片がループ１０
の自重に耐えられないで、鋳片は最小間隙部４の直下で
破断し易い。[0006] FIG. 6 shows an example of a running path for conveying the manufactured slab 6 to the winding machine 9. As shown in FIG. FIG. 6A shows an example in which the loop 10 is formed and then wound. At this time, the dead weight of the slab 6 of the loop 10 is applied to the slab portion directly below the minimum gap 4. However, as already mentioned, the slab directly below the minimum gap 4 is extremely fragile. Therefore, the slab directly below the minimum gap 4 is the loop 10.
The slab cannot withstand its own weight, and is likely to break immediately below the minimum gap 4.
【０００７】図６（Ｂ）は下降する鋳片を滑り台１１で
支承した例である。この際鋳片は滑り台１１上を滑って
搬送ロール群１４に案内される。尚鋳片の大部分の自重
は滑り台にかゝる。従って鋳片が、最小間隙部４の直下
で破断する事を防止する。図６（Ｂ）では、平滑な傾斜
面の滑り台１１の例を図示したが、水平な多数のローラ
を用いて鋳片を下方から支承し傾斜誘導する滑り台であ
ってもよい。FIG. 6(B) shows an example in which a descending slab is supported by a slide 11. At this time, the slab slides on the slide 11 and is guided to the transport roll group 14. The weight of most of the cast slab is on the slide. Therefore, the slab is prevented from breaking immediately below the minimum gap portion 4. Although FIG. 6(B) shows an example of the slide 11 having a smooth inclined surface, it may be a slide that uses a large number of horizontal rollers to support the slab from below and guide it incline.
【０００８】図６（Ｃ）では、ピンチロール１２が鋳片
の両面を加圧して支承する。この際鋳片の大部分の自重
はピンチロール１２にかゝる。従って鋳片が、最小間隙
部４の直下で破断することを防止する。In FIG. 6(C), pinch rolls 12 press and support both sides of the slab. At this time, most of the dead weight of the slab is applied to the pinch rolls 12. Therefore, the slab is prevented from breaking immediately below the minimum gap portion 4.
【０００９】図６では鋳片の搬送の走路を述べたが、鋳
造の開始に際しては、図６の最小間隙部４と捲取りロー
ル９の間にダミーシート１３を走路に沿って予め張り渡
す。ダミーシート１３は、一方の端部を双ロール１−１
と１−２に噛み込ませて配し、鋳片の走路に沿って延在
せしめ、他端を捲取機９に嵌着する。鋳造を開始する際
は、図５（Ａ）の湯溜り２内に溶湯を注入後、双ロール
１−１，１−２を矢印８方向に回転させ同時に捲取機９
によってダミーシートを巻取る。湯溜り２内のダミーシ
ートの端部には溶湯が融着凝固し、鋳片の先端部を形成
するが、双ロールを回転させ、ダミーシートを捲取機９
によって巻取ると、鋳片の先端部はダミーシートに案内
されて、図３（Ｂ）（Ｃ）で図示した走路に沿って走行
し、捲取機９に至り、巻取られる。FIG. 6 shows the running path for conveying the slab, but at the start of casting, a dummy sheet 13 is stretched in advance along the running path between the minimum gap 4 and the take-up roll 9 shown in FIG. The dummy sheet 13 has one end attached to the double roll 1-1.
and 1-2, and extend along the running path of the slab, and the other end is fitted into the winding machine 9. When starting casting, after pouring the molten metal into the trough 2 shown in FIG.
Wind up the dummy sheet. The molten metal melts and solidifies at the end of the dummy sheet in the pool 2, forming the tip of the slab.
When the slab is wound up, the leading end of the slab is guided by a dummy sheet, travels along the running path shown in FIGS. 3(B) and 3(C), reaches the winding machine 9, and is wound up.
【００１０】0010
【発明が解決しようとする課題】本発明者等は、図６（
Ｂ），（Ｃ）の型式の双ロール式連続鋳造機で、軟鋼製
の帯板のダミーシートを用いて鋳造を行ったが、ダミー
シートに後続して送り出された鋳片の先端部近傍に薄肉
域が発生することを知得した。図４は鋳造開始直後の鋳
片の形状の説明図である。[Problems to be Solved by the Invention] The present inventors have discovered that FIG.
Casting was carried out using a dummy sheet made of a mild steel strip using a twin-roll continuous casting machine of types B) and (C). I learned that thin areas occur. FIG. 4 is an explanatory diagram of the shape of the slab immediately after the start of casting.
【００１１】図４でダミーシート１３に隣接して瘤状部
１８が形成されている。瘤状部１８は板厚が厚い。瘤状
部１８に後続して薄肉域１６が発生する。薄肉域１６は
板厚が薄いために鋳片は破断し易い。定常部１９は薄肉
域１６に後続して表れる。定常部１９以降は、鋳片の板
厚には大きな変動はない。In FIG. 4, a bump-shaped portion 18 is formed adjacent to the dummy sheet 13. The bump-shaped portion 18 has a thick plate. A thin wall region 16 occurs following the bump-like portion 18 . Since the plate thickness in the thin-walled region 16 is thin, the slab is easily broken. A steady portion 19 appears following the thin area 16. After the steady portion 19, there is no significant variation in the thickness of the slab.
【００１２】以上述べた如く、双ロール式薄板連続鋳造
では、薄肉部が発生するが、通常の方法では捲取機に至
る過程で破断し易い。本発明は、この破断を防止するこ
とが可能なダミーシートの提供を課題としている。[0012] As described above, thin-walled parts occur in twin-roll continuous thin plate casting, but in the normal method, they tend to break during the process of reaching the winding machine. An object of the present invention is to provide a dummy sheet that can prevent this breakage.
【００１３】[0013]
【課題を解決するための手段および作用】特開昭６３−
２２４８４７号は、先端部に、長さが３０ｍｍ以上の例
えば１００ｍｍの純鉄線、軟鋼線、ステンレス鋼で代表
される高融点材料をとりつけたダミーシートである。し
かし後で述べる如く上記の高融点材料をとりつけただけ
では、薄肉域での鋳片の破断の防止には不十分である。[Means and effects for solving the problem] JP-A-63-
No. 224847 is a dummy sheet in which a high melting point material such as pure iron wire, mild steel wire, or stainless steel with a length of 30 mm or more, for example, 100 mm, is attached to the tip. However, as will be described later, simply attaching the above-mentioned high melting point material is not sufficient to prevent the slab from breaking in the thin wall region.
【００１４】例えばＮｉを５０重量％含有するＮｉ−Ｃ
ｕ合金薄板や、Ｆｅを５０重量％含有するＦｅ−Ｃｕ合
金薄板や、Ｃｏを３０重量％含有するＣｏ−Ｃｕ合金薄
板は、弱電機器に使用されているが、圧延によって薄板
を製造する事は難しい。For example, Ni-C containing 50% by weight of Ni
U alloy thin sheets, Fe-Cu alloy thin sheets containing 50% by weight of Fe, and Co-Cu alloy thin sheets containing 30% by weight of Co are used in light electrical equipment, but thin sheets cannot be manufactured by rolling. difficult.
【００１５】双ロール式薄板連続鋳造法によると溶湯か
ら直接薄板を製造する事ができる。しかしこれ等の弱電
機器用合金は、特に高温では脆弱であるために、図４で
述べた薄肉域１６が発生すると破断し易い。[0015] According to the twin-roll continuous thin plate casting method, thin plates can be produced directly from molten metal. However, these alloys for weak electrical appliances are fragile, especially at high temperatures, and are therefore prone to breakage when the thin-walled region 16 described in FIG. 4 occurs.
【００１６】後で詳述するが、双ロール式連続鋳造では
、薄肉域１６の発生を防止する事は容易ではない。従っ
て本発明者等は、薄肉域１６が発生しても、破断せしめ
ない方法を研究した。As will be explained in detail later, in twin roll continuous casting, it is not easy to prevent the thin wall region 16 from occurring. Therefore, the inventors of the present invention have researched a method of preventing the thin wall region 16 from breaking even if it occurs.
【００１７】即ち、ダミーシート１３の、鋳片を連結す
る側の端部に、金属製の補強材２０−１及び２０−２を
湯溜り内に延在するように接合したダミーシートを研究
した。図１はこの方法で得られた鋳造開始直後の鋳片の
縦断面の説明図である。即ち補強材２０−１及び２０−
２は、一端は軟鋼製のダミーシート１３の端部に接合し
、薄肉域１６を縦に貫通して、他端を定常部１９で鋳片
と融着せしめる。このダミーシートを用いると、鋳片は
捲取機に巻取られる搬送の間に、薄肉域１６でワレが発
生しても、補強材が十分に強い場合は、補強材によって
相互に連結されて、ワレが発生した部分が破断する事を
防止する。That is, a dummy sheet was researched in which metal reinforcing members 20-1 and 20-2 were joined to the end of the dummy sheet 13 on the side where the slabs are connected so as to extend into the pool. . FIG. 1 is an explanatory diagram of a longitudinal section of a slab obtained by this method immediately after the start of casting. That is, the reinforcing materials 20-1 and 20-
2 has one end joined to the end of a dummy sheet 13 made of mild steel, passes vertically through the thin-walled region 16, and has the other end fused to the slab at a constant portion 19. If this dummy sheet is used, even if cracks occur in the thin-walled area 16 while the cast slab is being transported and wound up by a winding machine, if the reinforcing material is strong enough, the slab will be interconnected by the reinforcing material. , to prevent the cracked part from breaking.
【００１８】図２は鋳造開始直後の鋳片の厚さの推移の
例である。ダミーシートの端部に隣接して瘤状部１８が
発生し、瘤状部１８に隣接して薄肉域１６が形成される
。図２の例では、薄肉域１６は、ダミーシートの端部か
ら１３０ｍｍ〜４５０ｍｍの間に形成され、その間の鋳
片の厚さは定常部１９に於ける鋳片の厚さの約１／２で
極めて薄い。ダミーシートの端部から４５０ｍｍ以上は
定常部で鋳片は厚く大凡均一である。図２に示した如く
、本発明者等の知見によると、薄肉域１６は、鋳造開始
時の溶湯の湯面相応部よりも長く形成される事はない。
即ち鋳造開始時の溶湯の湯面相応部においては、鋳片は
定常部の厚さとなる。既に述べた如く、本発明の補強材
は、薄肉域１６を貫通して、他端を鋳片の定常部１９内
に延在させて溶着させる。補強材の長さを十分に長くし
て、鋳造開始時の溶湯の湯面より突出する長さとすると
、補強材の他端を常に定常部内に延在させて、定常部の
鋳片に融着させることができる。FIG. 2 shows an example of the change in thickness of a slab immediately after the start of casting. A bump-shaped portion 18 is generated adjacent to the end of the dummy sheet, and a thin-walled region 16 is formed adjacent to the bump-shaped portion 18. In the example of FIG. 2, the thin area 16 is formed between 130 mm and 450 mm from the end of the dummy sheet, and the thickness of the slab in that area is approximately 1/2 of the thickness of the slab in the stationary part 19. and extremely thin. The area beyond 450 mm from the end of the dummy sheet is a stationary area where the slab is thick and approximately uniform. As shown in FIG. 2, according to the findings of the present inventors, the thin wall region 16 is never formed longer than the portion corresponding to the surface of the molten metal at the start of casting. That is, in a portion corresponding to the molten metal level at the start of casting, the slab has the thickness of the steady portion. As already mentioned, the reinforcing material of the present invention penetrates the thin-walled region 16, extends the other end into the constant portion 19 of the slab, and is welded thereto. If the length of the reinforcing material is made long enough so that it protrudes from the surface of the molten metal at the start of casting, the other end of the reinforcing material will always extend into the stationary area and be fused to the slab in the stationary area. can be done.
【００１９】図３は、双ロール１−１，１−２とを回動
させる直前の、本発明のダミーシートの説明図である。
即ち本発明のダミーシートは、鋼帯１３の、鋳片を連結
する側の端部１３０に、両方のロール表面に沿って配設
され、かつ先端２００−１及び２００−２が溶湯の湯面
２１よりも突出する長さの補強材２０−１及び２０−２
を接合した事を特徴とする、ダミーシートである。FIG. 3 is an explanatory diagram of the dummy sheet of the present invention immediately before the twin rolls 1-1 and 1-2 are rotated. That is, the dummy sheet of the present invention is disposed at the end 130 of the steel strip 13 on the side where the slabs are connected, along the surfaces of both rolls, and the tips 200-1 and 200-2 are located at the surface of the molten metal. Reinforcing members 20-1 and 20-2 with a length that protrudes beyond 21
This is a dummy sheet characterized by joining.
【００２０】本発明の補強材の材質は特に限定するもの
ではないが、炭素鋼、ステンレス鋼等を用いると、補強
材と鋼帯の端部１３０との接合が容易である。また表面
にセラミック被覆した炭素鋼、ステンレス鋼を用いると
、湯溜り内で溶湯に溶蝕される事がなく、強度が強い補
強材となる。またＷ，Ｔａ，Ｍｏ等の高融点で且つ高温
でも高強度な金属を用いると、強度が一層強い補強材が
得られる。The material of the reinforcing material of the present invention is not particularly limited, but if carbon steel, stainless steel, etc. are used, the reinforcing material and the end portion 130 of the steel strip can be easily joined. Furthermore, if carbon steel or stainless steel is used with a ceramic coating on the surface, it will not be corroded by the molten metal in the tundish, and will become a strong reinforcing material. Further, by using a metal such as W, Ta, or Mo that has a high melting point and high strength even at high temperatures, a reinforcing material with even higher strength can be obtained.
【００２１】例えば鋼板等の金属の薄板は広く市販され
ており、また金属板にセラミック被覆を施すことは容易
である。従って金属板は補強材として好ましい。多数の
金属線を並べた補強材は、凝固した鋳片との接触面積が
大きく、従って、補強材の他の端部を、強い接合力で定
常部の凝固鋳片内に固定する事ができる。従って金属線
は補強材として好ましい。金属網の補強材は、網目を形
成している横線や斜め線が定常部の凝固シェル内に埋設
されるために、補強材を強い接合力で定常部の凝固鋳片
内に固定する事ができる。従って金属網は補強材として
好ましい。[0021] For example, thin metal plates such as steel plates are widely available on the market, and it is easy to apply a ceramic coating to a metal plate. Metal plates are therefore preferred as reinforcing materials. A reinforcing material made of a large number of metal wires has a large contact area with the solidified slab, so the other end of the reinforcing material can be fixed within the solidified slab in the stationary part with strong bonding force. . Metal wires are therefore preferred as reinforcing materials. In the case of reinforcing metal mesh, the horizontal and diagonal lines that form the mesh are embedded within the solidified shell of the stationary section, so the reinforcing material can be fixed within the solidified slab of the stationary section with strong bonding force. can. Metal mesh is therefore preferred as a reinforcing material.
【００２２】既に述べた特開昭６３−２２４８４７号で
は、長さが３０ｍｍ以上の例えば１００ｍｍの高融点材
料をダミーシートの先端部にとりつける。しかし例えば
図２で薄肉域はダミーシートの先端部から１３０ｍｍ〜
４５０ｍｍの範囲である。このため長さが３０〜１００
ｍｍの高融点材料では薄肉域を貫通させる事ができない
で、従って鋳片が薄肉部で破断する事を防止できない。In the above-mentioned Japanese Patent Laid-Open No. 63-224847, a high melting point material having a length of 30 mm or more, for example 100 mm, is attached to the tip of a dummy sheet. However, for example, in Figure 2, the thin area is 130 mm from the tip of the dummy sheet.
The range is 450mm. Therefore, the length is 30 to 100
mm high melting point material cannot penetrate through the thin wall area, and therefore cannot prevent the slab from breaking at the thin wall area.
【００２３】図４で、薄肉域１６は下記の如くに発生す
ると想考される。図７（Ａ）は図５（Ａ）の凝固シェル
３−２の形成の説明図である。湯溜りの湯面がａ’の時
は、凝固シェルはロール１−２上のａ点が４に達するま
での時間凝固が進行し、最小間隙部４における凝固シェ
ルは４から４ａに至る厚さとなる。湯溜りの湯面がｂ’
の時は、最小間隙部４における凝固シェルは同様に４か
ら４ｂに至る厚さとなる。以上の如く、湯面が高いと凝
固シェルは厚く湯面が低くなると薄くなる。図７（Ｂ）
は双ロールが回動する直前である。双ロールの回動の前
には予め溶湯を所定の高さまで注入するが、この注入の
間に溶湯の凝固は進行し、回動を開始する際には、最小
間隙部ｔ１よりも厚いｔ２ｍｍの合体した凝固シェルが
形成されている。厚さがｔ２ｍｍの合体した凝固シェル
は図７（Ｃ）の如く双ロールを最小間隙部がｔ１からｔ
２となるように左右に移動して通過させるが、この双ロ
ールの移動によって湯溜りの容積は急に増大し、溶湯の
湯面は低下する。また図７（Ｃ）で、時間Ｔ０からＴ０
＋αに至るα秒の間に溶湯から取り出される凝固物の体
積はｍ１であり、 Ｔ０＋αからＴ０＋２αに至るα
秒の間に溶湯から取り出される凝固物の体積は ｍ２
である。即ちＴ０＋αからＴ０＋２αに至るα秒の間に
はｍ１よりも大きいｍ２の凝固物が湯溜りから取り出さ
れる。従って溶湯の湯面は一層低下する。以上の如く、
双ロールを回転させた直後は湯溜り内の溶湯の湯面は急
に低下するが、湯面が低下すると、図７（Ａ）で述べた
如く凝固シェル（鋳片）の厚さが薄くなり、薄肉域を形
成する。尚図７（Ｃ）で厚さがｔ２の合体した凝固シェ
ルは図４の瘤状部１８となる。In FIG. 4, it is assumed that the thin area 16 occurs as follows. FIG. 7(A) is an explanatory diagram of the formation of the solidified shell 3-2 in FIG. 5(A). When the hot water level in the pool is a', solidification of the solidified shell progresses for a period of time until point a on the roll 1-2 reaches 4, and the solidified shell in the minimum gap 4 has a thickness ranging from 4 to 4a. Become. The surface of the hot water pool is b'
When , the solidified shell in the minimum gap 4 similarly has a thickness ranging from 4 to 4b. As mentioned above, the solidified shell becomes thicker when the hot water level is high and becomes thinner when the hot water level is low. Figure 7(B)
is just before the twin rolls rotate. Before the twin rolls rotate, molten metal is injected to a predetermined height, but during this injection the molten metal solidifies, and when the twin rolls start rotating, a gap t2mm thicker than the minimum gap t1 is filled. A coalesced solidified shell is formed. The combined solidified shell with a thickness of t2mm is rolled between twin rolls with the minimum gap between t1 and t as shown in Figure 7(C).
The molten metal is moved left and right to pass the molten metal, but due to the movement of the twin rolls, the volume of the pool suddenly increases and the level of the molten metal decreases. Also, in FIG. 7(C), from time T0 to T0
The volume of solidified material taken out from the molten metal during α seconds leading up to +α is m1, and α leading from T0+α to T0+2α
The volume of solidified material removed from the molten metal in seconds is m2
It is. That is, during α seconds from T0+α to T0+2α, a coagulated material of m2, which is larger than m1, is taken out from the pool. Therefore, the level of the molten metal decreases further. As above,
Immediately after the twin rolls are rotated, the level of the molten metal in the pool drops suddenly, but as the level drops, the thickness of the solidified shell (slab) becomes thinner, as described in Figure 7 (A). , forming a thin area. In addition, the combined solidified shell having a thickness of t2 in FIG. 7(C) becomes the lump-shaped portion 18 in FIG. 4.
【００２４】以上述べた如く、薄肉域の鋳片の肉厚は図
７のｔ２が発生する事に起因するが、図７のｔ２は、溶
湯の温度や注入速度や双ロールの温度等の作業条件によ
り変動する。従って双ロール式薄板連続鋳造においては
、薄肉域の鋳片の厚さを制御する事が困難で、厚さが薄
い薄肉域が不測に発生するが、本発明のダミーシートに
おいては、補強材が鋳片の薄肉域１６を補強して鋳片の
破断を防止する。As mentioned above, the thickness of the slab in the thin area is due to the occurrence of t2 in FIG. 7, but t2 in FIG. Varies depending on conditions. Therefore, in twin-roll continuous thin plate casting, it is difficult to control the thickness of the slab in the thin-walled region, and thin-walled regions with thinner thickness occur unexpectedly.However, in the dummy sheet of the present invention, the reinforcing material is The thin wall area 16 of the slab is reinforced to prevent the slab from breaking.
【００２５】[0025]
【発明の効果】本発明のダミーシートを用いると、鋳造
開始直後の鋳片部が捲取機に搬送される過程で、鋳片に
ワレが発生しても鋳片を破断させる事がない。[Effects of the Invention] By using the dummy sheet of the present invention, even if cracks occur in the slab during the process in which the slab immediately after the start of casting is conveyed to the winding machine, the slab will not break.
【図１】は、本発明のダミーシートの作用の説明図、FIG. 1 is an explanatory diagram of the action of the dummy sheet of the present invention,
【
図２】は、鋳造開始直後の鋳片の厚さの説明図、[
Figure 2 is an explanatory diagram of the thickness of the slab immediately after the start of casting;
【図３
】は双ロールを回動させる直前のダミーシートの設定の
説明図、[Figure 3
] is an explanatory diagram of the dummy sheet settings just before rotating the twin rolls,
【図４】は鋳造開始直後の鋳片の形状の説明図、FIG. 4 is an explanatory diagram of the shape of the slab immediately after the start of casting;
【図５
】は、双ロール式薄板連続鋳造機による鋳片の製造の説
明図、[Figure 5
] is an explanatory diagram of the production of slabs using a twin-roll continuous thin plate casting machine,
【図６】は、鋳片を捲取機９に搬送する走路の説明図、
FIG. 6 is an explanatory diagram of a running path for conveying slabs to the winding machine 9;
【図７】は鋳片の薄肉域を説明する図、である。FIG. 7 is a diagram illustrating a thin wall region of a slab.
１−１（１−２）：双ロール、 ２：湯溜り、 ３
−１（３−２）：凝固シェル、４：最小間隙部、 ５
：溶湯、 ６：鋳片、 ７：凝固シェルの不適当な
合***置、 ８：双ロールの回転方向、 ９：捲取
機、 １０：ループ、 １１：滑り台、 １２：
ピンチロール、 １３：ダミーシート、 １４：搬
送ロール、１６：薄肉域、 １７：側堰、 １８：
瘤状部、 １９：定常部、 ２０−１（２０−２）
：補強材。1-1 (1-2): Twin rolls, 2: Hot water pool, 3
-1 (3-2): Solidified shell, 4: Minimum gap, 5
: Molten metal, 6: Slab, 7: Improper joining position of solidified shell, 8: Rotation direction of twin rolls, 9: Winding machine, 10: Loop, 11: Slide, 12:
Pinch roll, 13: Dummy sheet, 14: Conveyance roll, 16: Thin area, 17: Side weir, 18:
Lumpy part, 19: Constant part, 20-1 (20-2)
: Reinforcement material.
Claims (2)
ール表面に沿って配設され、かつ先端が湯溜り内の溶湯
の湯面より突出する長さの補強材を接合した事を特徴と
する、双ロール式薄板連続鋳造におけるダミーシート。Claim 1: A reinforcing material is attached to the end of the side where the slabs are connected, which is disposed along the surfaces of both rolls and whose tip protrudes above the surface of the molten metal in the pool. A dummy sheet for twin-roll continuous thin plate casting, characterized by:
ら選ばれる補強材である、請求項１に記載の双ロール式
薄板連続鋳造におけるダミーシート。2. The dummy sheet for twin-roll continuous sheet casting according to claim 1, wherein the reinforcing material is a reinforcing material selected from metal plates, metal wires, and metal nets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2596191A JPH04266462A (en) | 1991-02-20 | 1991-02-20 | Dummy sheet in twin roll type strip continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2596191A JPH04266462A (en) | 1991-02-20 | 1991-02-20 | Dummy sheet in twin roll type strip continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04266462A true JPH04266462A (en) | 1992-09-22 |
Family
ID=12180341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2596191A Pending JPH04266462A (en) | 1991-02-20 | 1991-02-20 | Dummy sheet in twin roll type strip continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04266462A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010211829A (en) * | 2010-06-07 | 2010-09-24 | Canon Inc | Information processing device, information processing method, and computer-readable recording medium |
-
1991
- 1991-02-20 JP JP2596191A patent/JPH04266462A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010211829A (en) * | 2010-06-07 | 2010-09-24 | Canon Inc | Information processing device, information processing method, and computer-readable recording medium |
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