JP2001205398A - Cooling drum for twin-drum type continuous casting of thin slab and method for manufacturing the same - Google Patents
Cooling drum for twin-drum type continuous casting of thin slab and method for manufacturing the sameInfo
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- JP2001205398A JP2001205398A JP2000016233A JP2000016233A JP2001205398A JP 2001205398 A JP2001205398 A JP 2001205398A JP 2000016233 A JP2000016233 A JP 2000016233A JP 2000016233 A JP2000016233 A JP 2000016233A JP 2001205398 A JP2001205398 A JP 2001205398A
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- drum
- cooling drum
- twin
- continuous casting
- alloy
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、一対の冷却ドラム
によって溶融金属から薄帯を連続鋳造するに際して使用
する冷却ドラムのドラム構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum structure of a cooling drum used for continuously casting a ribbon from a molten metal by a pair of cooling drums.
【０００２】[0002]
【従来の技術】金属の連続鋳造分野において、最終形状
に近い薄帯を連続鋳造する方法として一対の冷却ドラム
を用いた双ドラム式ストリップ連続鋳造方法があるが、
この鋳造方法は図１に示すように、溶融金属Ｍが一対の
冷却ドラム１−ａ、１−ｂとこれら冷却ドラム間の溶融
金属をシールするためのサイド堰２−ａ、２−ｂとの間
に形成された湯溜まり３にタンディシュ（図示せず。）
から供給され、次いで冷却ドラム１−ａ、１−ｂを介し
て抜熱され、冷却ドラム１−ａ、１−ｂの周面に凝固シ
ェル４を形成され、更に前記冷却ドラム間のロールギャ
ップで圧着され一体化された薄帯Ｓとなって送り出され
る。2. Description of the Related Art In the field of continuous casting of metal, there is a twin-drum strip continuous casting method using a pair of cooling drums as a method of continuously casting a ribbon having a shape close to the final shape.
In this casting method, as shown in FIG. 1, molten metal M is formed by a pair of cooling drums 1-a, 1-b and side dams 2-a, 2-b for sealing the molten metal between these cooling drums. A tundish (not shown) is placed in the hot water pool 3 formed therebetween.
And then the heat is removed via the cooling drums 1-a and 1-b to form a solidified shell 4 on the peripheral surface of the cooling drums 1-a and 1-b. It is pressed out and formed as an integrated ribbon S and sent out.
【０００３】前記鋳造方法において使用する冷却ドラム
は、従来の固定鋳型に比較し、冷却速度が大きいために
熱流束が大きく、そのため熱歪みによって割れが発生し
易いので冷却ドラム内部を銅合金製とし、その鋳造面表
面にＮｉ等をメッキして緩冷却化を図る方法が採られて
いる。その一例として、特開平５−９２２３９号公報に
開示されているように、冷却ドラムの外側を加熱する加
熱手段を配設する方法、また、特開平７−３２８７４９
号公報に開示されているように、鋳造面の表層を純Ｎｉ
メッキ層、Ｆｅ，Ｗまたは非金属を含むＮｉ−異材料分
散メッキ層、Ｃｏ−Ｎｉメッキ層のいずれかからなる低
熱伝導性材料で形成し、内層を銀銅またはＣｒ−Ｚｒ銅
からなる高熱伝導性材料で形成した複層構造とし、更
に、低熱伝導性材料と高熱伝導性材料の境界面に凹凸を
形成すると共に、鋳造面の表面を平滑面とした冷却ドラ
ムが提案されている。更に、冷却ドラム表面に合金メッ
キ等を施した後、表層部に一定の深さを持った凹凸部を
形成して更にこの冷却ドラムの鋳造面の表面を平滑面と
した冷却ドラムも提案されている。[0003] The cooling drum used in the casting method has a higher cooling rate than conventional fixed molds, and therefore has a large heat flux. Therefore, cracks are easily generated by thermal distortion. In addition, a method is adopted in which the surface of the casting surface is plated with Ni or the like to achieve slow cooling. As an example thereof, a method of disposing a heating means for heating the outside of a cooling drum as disclosed in Japanese Patent Application Laid-Open No. 5-92239, and Japanese Patent Application Laid-Open No. 7-328749.
As disclosed in Japanese Patent Publication No.
It is formed of a low thermal conductive material composed of any of a plating layer, a Ni-dissimilar material dispersed plating layer containing Fe, W or non-metal, and a Co-Ni plating layer, and the inner layer has a high thermal conductivity composed of silver copper or Cr-Zr copper. There has been proposed a cooling drum having a multilayer structure formed of a conductive material, forming irregularities on a boundary surface between a low thermal conductive material and a high thermal conductive material, and having a smooth casting surface. Furthermore, a cooling drum has been proposed in which after the surface of the cooling drum is subjected to alloy plating or the like, an uneven portion having a certain depth is formed on the surface layer portion, and the surface of the casting surface of the cooling drum is made smooth. I have.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上述し
た従来の冷却ドラム外表面を加熱する加熱手段を配設す
る方法では設備費が嵩む上に冷却ドラムの歪み除去が完
全に行えないという欠点があり、また、冷却ドラムに設
けた低熱伝導性材料と高熱伝導性材料の境界面に凹凸を
形成し、鋳造時に鋳片表面から局部的に不均一抜熱し、
鋳片の凝固殻に作用する熱応力を微細分散させて冷却ド
ラムの寿命を延長させる方法では依然として抜熱効果が
発揮できないという問題がある。本発明は、冷却ドラム
の耐久性を向上させた双ドラム式薄鋳片連続鋳造用冷却
ドラムとその製造方法を提供するものである。However, the above-mentioned conventional method of arranging the heating means for heating the outer surface of the cooling drum has a disadvantage that the equipment cost is increased and that the distortion of the cooling drum cannot be completely removed. In addition, irregularities are formed on the interface between the low heat conductive material and the high heat conductive material provided on the cooling drum, and the heat is locally unevenly removed from the slab surface during casting.
In the method of extending the life of the cooling drum by finely dispersing the thermal stress acting on the solidified shell of the slab, there is a problem that the heat removal effect cannot be exhibited yet. The present invention provides a cooling drum for continuous casting of a twin-drum thin cast piece with improved durability of the cooling drum, and a method of manufacturing the same.
【０００５】[0005]
【課題を解決するための手段】本発明は、従来方式によ
る双ドラム式薄鋳片連続鋳造用冷却ドラムの表面割れを
解決するために、冷却ドラムの表層部にＣｕよりも熱流
束の小さい金属単体または合金の表層を付与し、この表
層の表面から特定の領域に空孔を多数設けた双式薄鋳片
連続鋳造用冷却ドラムとその製造方法であり、その要旨
は次の通りである。SUMMARY OF THE INVENTION According to the present invention, in order to solve the surface cracks of a cooling drum for continuous casting of a twin-drum thin cast slab by a conventional method, a metal layer having a smaller heat flux than Cu is provided on the surface layer of the cooling drum. A cooling drum for continuous casting of a twin type thin slab in which a surface layer of a simple substance or an alloy is provided, and a large number of holes are provided in a specific region from the surface of the surface layer, and a method for manufacturing the same, are as follows.
【０００６】（１）双ドラム式薄鋳片連続鋳造用冷却ド
ラムにおいて、該冷却ドラムに厚さ１〜２ｍｍの表層を
有し、前記表層の表面から２ｍｍ以内に空孔を有するこ
とを特徴とする双ドラム式薄鋳片連続鋳造用冷却ドラ
ム。 （２）双ドラム式薄鋳片連続鋳造用冷却ドラムにおい
て、該冷却ドラムに厚さ１〜２ｍｍの表層を有し、前記
表層がＮｉ、Ｃｏ、Ｃｏ−Ｎｉ合金、Ｎｉ−Ｗ合金、Ｃ
ｏ−Ｎｉ−Ｗ合金のいずれか１種以上からなり、前記表
層の表面から２ｍｍ以内に空孔を有し、該空孔の面積率
が前記冷却ドラム周面に対し１０〜７０％であることを
特徴とする双ドラム式薄鋳片連続鋳造用冷却ドラム。(1) A twin-drum cooling drum for continuous casting of thin slabs, wherein the cooling drum has a surface layer having a thickness of 1 to 2 mm, and has holes within 2 mm from the surface of the surface layer. Drum cooling drum for continuous casting of thin slabs. (2) A cooling drum for twin-drum type thin cast slab continuous casting, wherein the cooling drum has a surface layer having a thickness of 1 to 2 mm, and the surface layer is formed of Ni, Co, Co-Ni alloy, Ni-W alloy, C
It is made of at least one kind of o-Ni-W alloy, has holes within 2 mm from the surface of the surface layer, and the area ratio of the holes is 10 to 70% with respect to the peripheral surface of the cooling drum. A cooling drum for continuous casting of twin-drum thin cast slabs.
【０００７】（３）双ドラム式薄鋳片連続鋳造用冷却ド
ラムにおいて、該冷却ドラムに厚さ１〜２ｍｍの表層を
有し、前記表層がＮｉ、Ｃｏ、Ｃｏ−Ｎｉ合金、Ｎｉ−
Ｗ合金、Ｃｏ−Ｎｉ−Ｗ合金のいずれか１種以上からな
り、かつ前記表層の表面から１００〜２０００μｍの位
置に面積率１０〜７０％、平均孔径１００〜１０００μ
ｍの空孔を有することを特徴とする双ドラム式薄鋳片連
続鋳造用冷却ドラム。(3) A twin-drum type cooling drum for continuous casting of thin slabs, wherein the cooling drum has a surface layer having a thickness of 1 to 2 mm, and the surface layer is formed of Ni, Co, Co-Ni alloy, Ni-
W alloy or Co-Ni-W alloy, and the area ratio is 10 to 70% and the average pore diameter is 100 to 1000 μm at a position of 100 to 2000 μm from the surface of the surface layer.
A cooling drum for continuous casting of twin-drum thin cast slabs, characterized by having m holes.
【０００８】（４）請求項１、２または３記載の何れか
の項に記載の冷却ドラムを用いて鋳造することを特徴と
する双ドラム式薄鋳片連続鋳造方法。 （５）双ドラム式薄鋳片連続鋳造用冷却ドラムにおい
て、該冷却ドラムの表面にＮｉ、Ｃｏ、Ｃｏ−Ｎｉ合
金、Ｎｉ−Ｗ合金、Ｃｏ−Ｎｉ−Ｗ合金のいずれか１種
以上からなる表層を付与し、次いで，該表層の表面に深
さ１００〜２０００μｍ、面積率２０〜８０％、平均穴
径１００〜１０００μｍの凹部を形成し、更に、前記表
層に直径１．５〜４．０ｍｍの鋼球を用いてショット施
工して前記凹部を閉塞して空孔を形成することを特徴と
する双ドラム式薄鋳片連続鋳造用冷却ドラムの製造方
法。(4) A twin-drum thin cast continuous casting method characterized by casting using the cooling drum according to any one of claims 1, 2 and 3. (5) In the cooling drum for twin-drum thin cast continuous casting, the surface of the cooling drum is made of at least one of Ni, Co, Co-Ni alloy, Ni-W alloy and Co-Ni-W alloy. A surface layer is provided, and a concave portion having a depth of 100 to 2000 μm, an area ratio of 20 to 80%, and an average hole diameter of 100 to 1000 μm is formed on the surface of the surface layer, and a diameter of 1.5 to 4.0 mm is formed on the surface layer. A method of producing a cooling drum for twin-drum type thin cast continuous casting, characterized in that a shot is performed using the steel ball of (1) to form a hole by closing the recess.
【０００９】（６）請求項５記載の冷却ドラムを用いて
鋳造することを特徴とする双ドラム式薄鋳片連続鋳造方
法。(6) A twin-drum thin cast continuous casting method characterized by casting using the cooling drum according to claim 5.
【００１０】[0010]
【発明の実施の形態】本発明について図面に基づいて説
明する。図１は、一対の冷却ドラムを用いた双ドラム式
薄鋳片の連続鋳造装置の斜視図で、溶融金属Ｍが一対の
冷却ドラム１−ａ、１−ｂとこれら冷却ドラム間の溶融
金属をシールするためのサイド堰２−ａ、２−ｂとの間
に形成された湯溜まり３にタンディシュから供給され、
次いで冷却ドラム１−ａ、１−ｂを介して抜熱され、冷
却ドラム１−ａ、１−ｂの周面に凝固シェル４を形成さ
れ、更に前記冷却ドラム間の最近接点ＫＰで圧着され一
体化された薄帯Ｓとなって送り出される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a twin-drum thin casting slab continuous casting apparatus using a pair of cooling drums. Molten metal M is used to form a pair of cooling drums 1-a and 1-b and a molten metal between these cooling drums. It is supplied from a tundish to a pool 3 formed between the side weirs 2-a and 2-b for sealing.
Next, the heat is removed through the cooling drums 1-a and 1-b, and a solidified shell 4 is formed on the peripheral surface of the cooling drums 1-a and 1-b. The thin ribbon S is sent out.
【００１１】図２は、従来方式におけるディンプル加工
を行った冷却ドラムの断面であり、Ｃｕ或いはＣｕ合金
からなるスリーブ５の表面にＮｉ、Ｃｏ或いはＣｏ−Ｎ
ｉ，Ｎｉ−Ｗ，Ｃｏ−Ｎｉ−Ｗ合金の何れかを厚さ約１
〜２ｍｍのメッキ層６を施した冷却ドラムである。冷却
ドラム表面の加工は、メッキ層６の表面に、たがね加
工、ショット加工、放電加工、レーザー加工、またはエ
ッチング加工により深さ５０〜１５０μｍ、凹部径：２
００〜１０００μｍを有するディンプル１１を面積率２
０〜８０％で形成した冷却ドラムであり、図２はショッ
ト加工の例を示す。しかしながら、これらディンプル１
１の内部に異物が侵入し、そして蓄積し除去できなくな
るという事態が生じる。また、一方ではディンプル１１
が平滑面となるために折角のディンプル状態に形成して
も何らディンプルとして機能しなくなることになる。FIG. 2 is a cross section of a cooling drum which has been subjected to dimple processing in a conventional method. The surface of a sleeve 5 made of Cu or Cu alloy is Ni, Co or Co-N.
i, Ni-W, or Co-Ni-W alloy having a thickness of about 1
This is a cooling drum provided with a plating layer 6 of about 2 mm. Processing of the surface of the cooling drum is performed on the surface of the plating layer 6 by depth processing, shot processing, electric discharge processing, laser processing, or etching processing to a depth of 50 to 150 μm and a concave portion diameter of 2.
Dimples 11 having a size of 00 to 1000 μm
This is a cooling drum formed at 0 to 80%, and FIG. 2 shows an example of shot processing. However, these dimples 1
Foreign matter invades the inside of 1 and accumulates and cannot be removed. On the other hand, dimple 11
Becomes a smooth surface, so that it does not function as a dimple at all even if it is formed into a dimple with a bent angle.
【００１２】本発明による冷却ドラムは、図３に示すよ
うに、冷却ドラムの周面に嵌着されたＣｕあるいはＣｕ
合金製のスリーブ５の表面にＮｉ、Ｃｏ、Ｃｏ−Ｎｉ合
金、Ｎｉ−Ｗ合金、Ｃｏ−Ｎｉ−Ｗ合金のいずれか１種
以上からなるメッキ層６を１〜２ｍｍの厚さで冷却ドラ
ムの周面に形成し、メッキ層６の表面に、放電加工、レ
ーザー加工、またはエッチング加工、好ましくはレーザ
ー加工により深さｄが１００〜２０００μｍ、穴径１０
０〜１０００μｍの凹部９を表面積換算で面積率２０〜
８０％となるように加工し、その後、最表層１２に直径
１．５〜４．０ｍｍの鋼球でショット施工して凹部９を
閉塞して、図４に示すように空孔８を形成するととも
に、表面にディンプル１１を付与する工程を経て製造し
た双ドラム式薄鋳片連続鋳造用冷却ドラムである。As shown in FIG. 3, the cooling drum according to the present invention comprises Cu or Cu
A plating layer 6 made of at least one of Ni, Co, Co-Ni alloy, Ni-W alloy, and Co-Ni-W alloy is formed on the surface of the alloy sleeve 5 to a thickness of 1 to 2 mm to form a cooling drum. Formed on the peripheral surface, the surface of the plating layer 6 has a depth d of 100 to 2000 μm and a hole diameter of 10 by electric discharge machining, laser machining, or etching, preferably laser machining.
The concave portion 9 of 0 to 1000 μm has an area ratio of 20 to
It is processed to 80%, and thereafter, the outermost layer 12 is shot-shot with a steel ball having a diameter of 1.5 to 4.0 mm to close the recess 9 and form a hole 8 as shown in FIG. Further, a twin drum type thin cast slab continuous casting cooling drum manufactured through a process of providing dimples 11 on the surface.
【００１３】本発明において、前述したような空孔８を
設ける理由は、断熱効果であり、そのためには数多くの
実験の結果、表層部の適切な位置に多数の空孔を設けれ
ば優れた断熱効果が得られることが判明したものであ
る。この断熱効果が効き過ぎると凝固界面の温度が上昇
し、また断熱効果が弱いと熱歪みによってドラム割れが
発生する。そして、この空孔８を設けるドラム表面から
の深さｄは１００〜２０００μｍの範囲が好ましい。前
記空孔８の位置が表面に近すぎると表層が溶鋼の熱で溶
解し、また、深すぎると断熱効果が薄れるためである。
更に、前記空孔８の平均孔径を１００〜１０００μｍと
した理由は、レーザーの照射痕の大きさが大体この範囲
であること、また小さすぎると空孔として機能せず、大
きすぎると最後のショット施工で空孔ができないからで
ある。この空孔８の平均孔径は、５００μｍ程度が好ま
しい。更に、これらの空孔８は冷却ドラムの表面積換算
で面積率２０〜８０％となるように加工する。この面積
率が２０％以下では耐熱歪効果が発揮できず、また８０
％以上では凸状の柱だけの状態になり冷却ドラムの強度
が不足することになる。このようにして製造された冷却
ドラムは、最後に表面に直径１．５〜４．０ｍｍの鋼球
でショット施工して前記冷却ドラム最表層１２（凹部）
を閉塞した形状とする。このショット施工においては冷
却ドラム表面にディンプル１１が付与される。In the present invention, the reason why the holes 8 are provided as described above is the heat insulating effect. For this purpose, as a result of many experiments, it is excellent to provide a large number of holes at appropriate positions on the surface layer. It has been found that a heat insulating effect can be obtained. If the heat-insulating effect is too effective, the temperature of the solidification interface rises, and if the heat-insulating effect is weak, cracking of the drum occurs due to thermal distortion. The depth d from the drum surface where the holes 8 are provided is preferably in the range of 100 to 2000 μm. If the position of the holes 8 is too close to the surface, the surface layer is melted by the heat of the molten steel, and if it is too deep, the heat insulating effect is weakened.
Furthermore, the reason why the average pore diameter of the pores 8 is set to 100 to 1000 μm is that the size of the laser irradiation mark is approximately in this range, and if it is too small, it does not function as a pore. This is because holes cannot be formed during construction. The average diameter of the holes 8 is preferably about 500 μm. Further, these holes 8 are processed so as to have an area ratio of 20 to 80% in terms of the surface area of the cooling drum. If the area ratio is 20% or less, the heat distortion effect cannot be exhibited, and
If it is more than%, only the convex pillars will be provided, and the strength of the cooling drum will be insufficient. The cooling drum manufactured in this manner is finally shot-shot on the surface with a steel ball having a diameter of 1.5 to 4.0 mm, and the cooling drum outermost layer 12 (recess) is formed.
Is closed. In this shot construction, dimples 11 are provided on the cooling drum surface.
【００１４】このようにして製造された冷却ドラムの寿
命は、従来の２．５倍以上も延長され、熱流束単位では
従来に対して２０〜３４％低下し、如何に断熱効果があ
るかが分かる。The service life of the cooling drum manufactured in this way is extended more than 2.5 times as compared with the conventional one, and the heat flux unit is reduced by 20 to 34% in comparison with the conventional one. I understand.
【００１５】[0015]
【実施例】（実施例１）ドラム径：１２００ｍｍ、ドラ
ム幅：８００ｍｍの冷却ドラムの周面に厚さ１ｍｍのＮ
ｉメッキを施し、次いでこのメッキ層上にレーザー加工
により直径：５００μｍ、深さ：７００μｍの凹部を３
０％の面積率で形成後、更に、直径：４．０ｍｍの鋼球
にて前記凹部を閉塞するようにショットブラスト加工を
施した。この時のドラム表面のディンプル平均深さは１
５０μｍであった。その結果、図５に示すように、本実
施例１における熱流束は従来の単に冷却ドラムの周面に
厚さ１ｍｍのＮｉメッキとその表面にディンプル加工を
施した比較例の約２０％低減でき、しかも図６に示すよ
うに冷却ドラム寿命も従来の比較例の約３．４倍に延長
することができた。(Example 1) 1 mm thick N on the peripheral surface of a cooling drum having a drum diameter of 1200 mm and a drum width of 800 mm.
i-plating, and then three concave portions having a diameter of 500 μm and a depth of 700 μm are formed on the plating layer by laser processing.
After forming at an area ratio of 0%, shot blasting was further performed with a steel ball having a diameter of 4.0 mm so as to close the recess. At this time, the average dimple depth on the drum surface is 1
It was 50 μm. As a result, as shown in FIG. 5, the heat flux in the first embodiment can be reduced by about 20% as compared with the conventional comparative example in which the peripheral surface of the cooling drum is simply plated with Ni having a thickness of 1 mm and the surface thereof is subjected to dimple processing. In addition, as shown in FIG. 6, the life of the cooling drum could be extended to about 3.4 times that of the conventional comparative example.
【００１６】（実施例２）実施例１と同一のドラムサイ
ズを有する冷却ドラムの周面に厚さ１ｍｍのＮｉメッキ
を施し、次いでこのメッキ層上にレーザー加工により直
径：３００μｍ、深さ：７００μｍの凹部を５０％の面
積率で形成後、更に、直径：３．０ｍｍの鋼球にて前記
凹部を閉塞するようにショットブラスト加工を施した。
この時のドラム表面のディンプル平均深さは１３０μｍ
であった。その結果、図５に示すように、本実施例２に
おける熱流束は従来の単に冷却ドラムの周面に厚さ１ｍ
ｍのＮｉメッキと、その表面にディンプルを施した比較
例の約２５％低減でき、しかも図６に示すように冷却ド
ラム寿命も従来の比較例の約４倍に延長することができ
た。(Example 2) A 1 mm thick Ni plating is applied to the peripheral surface of a cooling drum having the same drum size as that of Example 1, and then the diameter of the plating layer is 300 μm and the depth is 700 μm by laser processing. Was formed at a 50% area ratio, and then shot blasting was performed with a steel ball having a diameter of 3.0 mm so as to close the recess.
At this time, the average dimple depth on the drum surface is 130 μm.
Met. As a result, as shown in FIG. 5, the heat flux in the second embodiment has a thickness of 1 m on the peripheral surface of the conventional cooling drum.
In this case, the life of the cooling drum could be extended to about four times that of the conventional comparative example, as shown in FIG.
【００１７】（実施例３）実施例１と同一のドラムサイ
ズを有する冷却ドラムの周面に厚さ１ｍｍのＮｉメッキ
を施し、次いでこのメッキ層上にレーザー加工により直
径：１００μｍ、深さ：７００μｍの凹部を７０％の面
積率で形成後、更に、直径：２．０ｍｍの鋼球にて前記
凹部を閉塞するようにショットブラスト加工を施した。
この時のドラム表面のディンプル深さは１１０μｍであ
った。その結果、図５に示すように、本実施例３におけ
る熱流束は従来の単に冷却ドラムの周面に厚さ１ｍｍの
Ｎｉメッキとその表面にディンプルを施した比較例の約
３４％低減でき、しかも図６に示すように冷却ドラム寿
命も従来の比較例の約４．７倍に延長することができ
た。(Embodiment 3) The peripheral surface of a cooling drum having the same drum size as in Embodiment 1 is plated with Ni having a thickness of 1 mm, and then the plated layer is laser-processed to have a diameter of 100 μm and a depth of 700 μm. Was formed at a 70% area ratio, and then shot blasting was performed with a steel ball having a diameter of 2.0 mm so as to close the recess.
At this time, the dimple depth on the drum surface was 110 μm. As a result, as shown in FIG. 5, the heat flux in the third embodiment can be reduced by about 34% as compared with the conventional comparative example in which the peripheral surface of the cooling drum is simply nickel-plated with a thickness of 1 mm and the surface is dimpled. Moreover, as shown in FIG. 6, the life of the cooling drum could be extended to about 4.7 times that of the conventional comparative example.
【００１８】[0018]
【発明の効果】以上述べたように、本発明は、双ロール
式連続鋳造用冷却ドラムのドラム表層内部に適切な大き
さの空孔を多数設けることにより断熱効果が高め、冷却
ドラム寿命の延長を図ることが可能になる。As described above, the present invention improves the heat insulating effect by providing a large number of holes of an appropriate size inside the drum surface layer of the twin-roll type continuous casting cooling drum, thereby extending the cooling drum life. Can be achieved.
【図１】双ロール式薄鋳片連続鋳造装置の斜視図であ
る。FIG. 1 is a perspective view of a twin-roll thin cast slab continuous casting apparatus.
【図２】従来の冷却ドラムの断面を示す図である。FIG. 2 is a diagram showing a cross section of a conventional cooling drum.
【図３】冷却ドラムの表層部に凹部を設けた冷却ドラム
の断面を示す図である。FIG. 3 is a diagram showing a cross section of a cooling drum having a concave portion provided in a surface layer portion of the cooling drum.
【図４】本発明による冷却ドラムの断面を示す図であ
る。FIG. 4 shows a cross section of a cooling drum according to the invention.
【図５】本発明による実施例と比較例における熱流束の
測定結果を示す図である。FIG. 5 is a diagram showing measurement results of heat flux in an example according to the present invention and a comparative example.
【図６】本発明による実施例と比較例における冷却ドラ
ム寿命の比較を示す図である。FIG. 6 is a diagram illustrating a comparison of cooling drum life between an example according to the present invention and a comparative example.
１…冷却ドラム ２…サイド堰 ３…湯溜まり ４…凝固シェル ５…スリーブ ６…メッキ層 ８…空孔 ９…凹部 １１…ディンプル １２…ドラム最表層 Ｓ…薄帯 ＫＰ…ドラム最近接点 ｄ…空孔の深さ DESCRIPTION OF SYMBOLS 1 ... Cooling drum 2 ... Side weir 3 ... Hot water pool 4 ... Solidified shell 5 ... Sleeve 6 ... Plating layer 8 ... Void 9 ... Depression 11 ... Dimple 12 ... Drum outermost layer S ... Thin KP ... Drum closest contact d ... Empty Hole depth
───────────────────────────────────────────────────── フロントページの続き (72)発明者 四阿 佳昭 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 Ｆターム(参考） 4E004 DA13 QA01 QA20 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiaki Yoa 20-1 Shintomi, Futtsu-shi, Chiba F-term in the Technology Development Division, Nippon Steel Corporation (reference) 4E004 DA13 QA01 QA20
Claims (6)
において、該冷却ドラムに厚さ１〜２ｍｍの表層を有
し、前記表層の表面から２ｍｍ以内に空孔を有すること
を特徴とする双ドラム式薄鋳片連続鋳造用冷却ドラム。1. A cooling drum for twin-drum thin cast continuous casting, wherein the cooling drum has a surface layer having a thickness of 1 to 2 mm, and has holes within 2 mm from the surface of the surface layer. Cooling drum for twin drum type thin cast continuous casting.
において、該冷却ドラムに厚さ１〜２ｍｍの表層を有
し、前記表層がＮｉ、Ｃｏ、Ｃｏ−Ｎｉ合金、Ｎｉ−Ｗ
合金、Ｃｏ−Ｎｉ−Ｗ合金のいずれか１種以上からな
り、前記表層の表面から２ｍｍ以内に空孔を有し、該空
孔の面積率が前記冷却ドラム周面に対し１０〜７０％で
あることを特徴とする双ドラム式薄鋳片連続鋳造用冷却
ドラム。2. A cooling drum for twin-drum thin cast slab continuous casting, wherein the cooling drum has a surface layer having a thickness of 1 to 2 mm, and the surface layer is formed of Ni, Co, Co-Ni alloy, Ni-W.
Alloy, one or more of a Co-Ni-W alloy, having holes within 2 mm from the surface of the surface layer, wherein the area ratio of the holes is 10 to 70% with respect to the peripheral surface of the cooling drum. A cooling drum for continuous casting of twin-drum thin cast slabs.
において、該冷却ドラムに厚さ１〜２ｍｍの表層を有
し、前記表層がＮｉ、Ｃｏ、Ｃｏ−Ｎｉ合金、Ｎｉ−Ｗ
合金、Ｃｏ−Ｎｉ−Ｗ合金のいずれか１種以上からな
り、かつ前記表層の表面から１００〜２０００μｍの位
置に面積率１０〜７０％、平均孔径１００〜１０００μ
ｍの空孔を有することを特徴とする双ドラム式薄鋳片連
続鋳造用冷却ドラム。3. A twin-drum cooling drum for continuous casting of thin slabs, the cooling drum having a surface layer having a thickness of 1 to 2 mm, wherein the surface layer is formed of Ni, Co, a Co-Ni alloy, Ni-W.
Alloy, one or more of a Co-Ni-W alloy, and an area ratio of 10 to 70% and an average pore diameter of 100 to 1000 µm at a position of 100 to 2000 µm from the surface of the surface layer.
A cooling drum for continuous casting of twin-drum thin cast slabs, characterized by having m holes.
に記載の冷却ドラムを用いて鋳造することを特徴とする
双ドラム式薄鋳片連続鋳造方法。4. A twin-drum thin cast slab continuous casting method, comprising casting using the cooling drum according to any one of claims 1, 2 and 3.
において、該冷却ドラムの表面にＮｉ、Ｃｏ、Ｃｏ−Ｎ
ｉ合金、Ｎｉ−Ｗ合金、Ｃｏ−Ｎｉ−Ｗ合金のいずれか
１種以上からなる厚さ１〜２ｍｍの表層を付与し、次い
で，該表層の表面に深さ１００〜２０００μｍ、面積率
２０〜８０％、平均穴径１００〜１０００μｍの凹部を
形成し、更に、前記表層に直径１．５〜４．０ｍｍの鋼
球を用いてショット施工して前記凹部を閉塞して空孔を
形成することを特徴とする双ドラム式薄鋳片連続鋳造用
冷却ドラムの製造方法。5. A cooling drum for twin-drum thin cast slab continuous casting, wherein the surface of the cooling drum is Ni, Co, Co-N.
A surface layer having a thickness of 1 to 2 mm made of at least one of an i-alloy, a Ni-W alloy, and a Co-Ni-W alloy is provided, and then a depth of 100 to 2000 μm and an area ratio of 20 to 80%, forming a concave portion having an average hole diameter of 100 to 1000 μm, and forming a hole by closing the concave portion with a shot using a steel ball having a diameter of 1.5 to 4.0 mm on the surface layer. A method for producing a cooling drum for continuous casting of twin-drum thin cast slabs, characterized in that:
することを特徴とする双ドラム式薄鋳片連続鋳造方法。6. A twin-drum thin cast continuous casting method, comprising casting using the cooling drum according to claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000016233A JP2001205398A (en) | 2000-01-25 | 2000-01-25 | Cooling drum for twin-drum type continuous casting of thin slab and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000016233A JP2001205398A (en) | 2000-01-25 | 2000-01-25 | Cooling drum for twin-drum type continuous casting of thin slab and method for manufacturing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001205398A true JP2001205398A (en) | 2001-07-31 |
Family
ID=18543401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000016233A Withdrawn JP2001205398A (en) | 2000-01-25 | 2000-01-25 | Cooling drum for twin-drum type continuous casting of thin slab and method for manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001205398A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100971971B1 (en) | 2008-07-03 | 2010-07-23 | 주식회사 포스코 | A twin roll of strip casting apparatus |
| US8122937B2 (en) | 2007-10-12 | 2012-02-28 | Nucor Corporation | Method of forming textured casting rolls with diamond engraving |
-
2000
- 2000-01-25 JP JP2000016233A patent/JP2001205398A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8122937B2 (en) | 2007-10-12 | 2012-02-28 | Nucor Corporation | Method of forming textured casting rolls with diamond engraving |
| KR100971971B1 (en) | 2008-07-03 | 2010-07-23 | 주식회사 포스코 | A twin roll of strip casting apparatus |
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