JP2009241121A - Lower nozzle and joined structure of lower nozzle - Google Patents
Lower nozzle and joined structure of lower nozzle Download PDFInfo
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- JP2009241121A JP2009241121A JP2008091769A JP2008091769A JP2009241121A JP 2009241121 A JP2009241121 A JP 2009241121A JP 2008091769 A JP2008091769 A JP 2008091769A JP 2008091769 A JP2008091769 A JP 2008091769A JP 2009241121 A JP2009241121 A JP 2009241121A
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- 238000009749 continuous casting Methods 0.000 claims abstract description 60
- 239000002184 metal Substances 0.000 claims abstract description 59
- 238000005304 joining Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 14
- 230000001154 acute effect Effects 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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Abstract
【課題】連鋳ノズルが受ける外力が伝播して発生する亀裂を抑制することが可能な下部ノズル及び下部ノズルの接合構造を提供する。
【解決手段】耐火物である下部ノズル本体１１の外周をメタルケース１２で被覆し、連鋳ノズル２０頭部の内孔とメタルケース１２を接触させることによって、下部ノズル１０と連鋳ノズル２０とを接合させる。この時、メタルケース１２と共に下部ノズル本体１１を連鋳ノズル２０と接触させてもよい。また、接触部には、目地材や緩衝材が設置されることが望ましい。
【選択図】図１The present invention provides a lower nozzle and a lower nozzle joining structure capable of suppressing cracks caused by propagation of an external force received by a continuous casting nozzle.
The outer periphery of a lower nozzle body 11 that is a refractory is covered with a metal case 12, and the inner hole of the head of the continuous casting nozzle 20 and the metal case 12 are brought into contact with each other. Are joined. At this time, the lower nozzle body 11 may be brought into contact with the continuous casting nozzle 20 together with the metal case 12. Moreover, it is desirable that a joint material or a cushioning material is installed in the contact portion.
[Selection] Figure 1
Description
本発明は、下部ノズル及び下部ノズルの接合構造に関し、特に、下部ノズルの亀裂発生を防止することが可能な下部ノズル及び下部ノズルの接合構造に関する。 The present invention relates to a joining structure of a lower nozzle and a lower nozzle, and more particularly to a joining structure of a lower nozzle and a lower nozzle that can prevent cracks in the lower nozzle.
取鍋やタンディッシュには、２枚若しくは３枚のスライディングノズルプレートを摺動させて溶鋼の流量を制御するスライディングノズル装置（以下、「ＳＮ装置」という）が設置されており、ＳＮ装置の下部ノズルには、ロングノズルや浸漬ノズルなどの連鋳ノズルが接合している。 The ladle and tundish are equipped with a sliding nozzle device (hereinafter referred to as “SN device”) that controls the flow rate of molten steel by sliding two or three sliding nozzle plates. A continuous casting nozzle such as a long nozzle or an immersion nozzle is joined to the nozzle.
そして、図５(ａ)に示すように、上部プレート１０１と下部プレート１０２を用いる２枚式のＳＮ装置１００では、下部プレート１０２を摺動させることで溶鋼の流量を制御しており、下部ノズル１０３を介して下部プレート１０２と接続する連鋳ノズル１１０は、当該連鋳ノズル１１０を支持する支持アーム（図示しない）がＳＮ装置１００の摺動に合わせて動作することで、ＳＮ装置１００の摺動に合わせて移動するように構成されている（例えば、特許文献１参照）。
ところで、特許文献１に記載されるように、連鋳ノズル１１０の上部は凹状に形成されている。また、下部ノズル１０３のノズル本体１０４は、下方に向かって凸状に形成され、ノズル本体１０４の外周面は、使用中の亀裂による割れや亀裂からの空気の巻き込みを防止するため、メタルケース１０５で覆われている。そして、図５(ｂ)に示すように、下部ノズル１０３のノズル本体１０４と連鋳ノズル１１０とを直接、若しくはモルタルなどの目地材（図示しない）を介して接合させて、大気の侵入などを防止している。 By the way, as described in Patent Document 1, the upper part of the continuous casting nozzle 110 is formed in a concave shape. Further, the nozzle body 104 of the lower nozzle 103 is formed in a convex shape downward, and the outer peripheral surface of the nozzle body 104 is prevented from being cracked due to a crack during use or air entrainment from the crack. Covered with. And as shown in FIG.5 (b), the nozzle main body 104 and the continuous casting nozzle 110 of the lower nozzle 103 are joined directly or through joint materials (not shown), such as mortar, and air intrusion etc. are carried out. It is preventing.
一方、ＳＮ装置の摺動は、直線方向の動作であるのに対して、連鋳ノズルを保持する支持アームの動作は、円弧状の動作であり、ＳＮ装置の摺動と支持アームの動作をリンクさせるものの、ＳＮ装置の摺動と連鋳ノズルの移動を完全に一致させることは困難である。 On the other hand, the sliding motion of the SN device is a linear motion, whereas the motion of the support arm that holds the continuous casting nozzle is an arc-shaped motion. Although linked, it is difficult to perfectly match the sliding of the SN device and the movement of the continuous casting nozzle.
このため、ＳＮ装置の摺動と連鋳ノズルの移動とにズレが生じると、連鋳ノズルが受けた外力が下部ノズルに伝播し、下部ノズル本体１０４の下端欠けや、図５(ｃ)に点線で示すように亀裂が誘発されたり、当該亀裂が拡大することがあった。 For this reason, when a deviation occurs between the sliding of the SN device and the movement of the continuous casting nozzle, the external force received by the continuous casting nozzle propagates to the lower nozzle, and the lower end of the lower nozzle main body 104 is notched, as shown in FIG. As indicated by the dotted line, a crack was sometimes induced or the crack expanded.
そこで、本発明では、連鋳ノズルが受ける外力が伝播して発生する亀裂を抑制することが可能な下部ノズル及び下部ノズルの接合構造を提供することを目的とする。 In view of the above, an object of the present invention is to provide a lower nozzle and a lower nozzle joining structure capable of suppressing cracks caused by propagation of an external force received by a continuous casting nozzle.
本発明は、下部プレートを摺動させて溶鋼の量を制御するスライディングノズル装置の下部ノズルと連鋳ノズルとの接合構造であって、前記連鋳ノズルは、溶鋼が通過する内孔の上部に上方に向かって拡径するテーパ部を備え、前記下部ノズルは、下部ノズル本体の外周を被覆するメタルケースを備え、前記メタルケースの外周側最下端及び前記下部ノズル本体の下端部外面と接する直線と前記内孔の中心軸とが成す鋭角は、前記テーパ部のテーパを延長した延長線と前記中心軸とが成す鋭角以上であり、前記連鋳ノズルと該メタルケースは、直接または目地材を介して接していることを特徴とする。 The present invention is a joining structure of a lower nozzle and a continuous casting nozzle of a sliding nozzle device that controls the amount of molten steel by sliding a lower plate, and the continuous casting nozzle is formed above an inner hole through which the molten steel passes. The lower nozzle includes a metal case that covers the outer periphery of the lower nozzle body, and a straight line that contacts the outermost lower end of the metal case and the outer surface of the lower end of the lower nozzle body. And the central axis of the inner hole is equal to or greater than the acute angle formed by the extension line extending the taper of the tapered portion and the central axis, and the continuous casting nozzle and the metal case may be used directly or jointly. It is characterized by touching through.
また、本発明は、下部プレートを摺動させて溶鋼の量を制御するスライディングノズル装置の下部ノズルと連鋳ノズルとの接合構造であって、前記連鋳ノズルは、溶鋼が通過する内孔の上部に上方に向かって拡径する凹状の円弧部を備え、前記下部ノズルは、下部ノズル本体の外周を被覆するメタルケースを備え、前記メタルケースの外周側最下端及び前記下部ノズル本体の下端部外面と接する直線と前記内孔の中心軸とが成す鋭角は、前記円弧部の上端及び下端と接する直線と前記中心軸とが成す鋭角以上であり、前記連鋳ノズルと該メタルケースは、直接または目地材を介して接していることを特徴とする。 Further, the present invention is a joining structure of a lower nozzle and a continuous casting nozzle of a sliding nozzle device that controls the amount of molten steel by sliding a lower plate, and the continuous casting nozzle has an inner hole through which the molten steel passes. A concave arc portion whose diameter is increased upward is provided at an upper portion, and the lower nozzle is provided with a metal case that covers an outer periphery of the lower nozzle body, and a lowermost end portion on an outer peripheral side of the metal case and a lower end portion of the lower nozzle body The acute angle formed between the straight line in contact with the outer surface and the central axis of the inner hole is equal to or greater than the acute angle formed between the straight line in contact with the upper and lower ends of the arc portion and the central axis, and the continuous casting nozzle and the metal case are directly Or it is contacting through the joint material.
次に、本発明は、下部プレートを摺動させて溶鋼の量を制御するスライディングノズル装置の下部ノズルであって、下部ノズル本体と、前記下部ノズル本体の外周を被覆するメタルケースとを具備し、前記メタルケースの外周側最下端及び前記下部ノズル本体の下端部外面と接する直線と溶鋼が通過する内孔の中心軸とが成す鋭角は、接合する連鋳ノズルの内孔の上部に形成された上方に向かって拡径するテーパ部のテーパを延長した延長線と前記中心軸とが成す鋭角以上であり、前記メタルケースを前記連鋳ノズルと接しさせて該連鋳ノズルと接合することを特徴とする。 Next, the present invention is a lower nozzle of a sliding nozzle device that controls the amount of molten steel by sliding a lower plate, and includes a lower nozzle body and a metal case that covers the outer periphery of the lower nozzle body. The acute angle formed by the straight line in contact with the outermost lower end of the metal case and the outer surface of the lower end of the lower nozzle body and the central axis of the inner hole through which the molten steel passes is formed at the upper part of the inner hole of the continuous casting nozzle to be joined. The taper of the taper portion whose diameter increases toward the upper side is an acute angle or more formed by an extension line extending the taper and the central axis, and the metal case is brought into contact with the continuous casting nozzle to be joined to the continuous casting nozzle. Features.
また、本発明は、下部プレートを摺動させて溶鋼の量を制御するスライディングノズル装置の下部ノズルであって、下部ノズル本体と、前記下部ノズル本体の外周を被覆するメタルケースとを具備し、前記メタルケースの外周側最下端及び前記下部ノズル本体の下端部外面と接する直線と溶鋼が通過する内孔の中心軸とが成す鋭角は、接合する連鋳ノズルの内孔の上部に形成された上方に向かって拡径する凹状の円弧部の上端及び下端と接する直線と前記中心軸とが成す鋭角以上であり、前記メタルケースを前記連鋳ノズルと接しさせて該連鋳ノズルと接合することを特徴とする。 Further, the present invention is a lower nozzle of a sliding nozzle device that controls the amount of molten steel by sliding the lower plate, and includes a lower nozzle body and a metal case that covers the outer periphery of the lower nozzle body, The acute angle formed by the straight line in contact with the outermost lower end of the metal case and the outer surface of the lower end of the lower nozzle body and the central axis of the inner hole through which the molten steel passes is formed at the upper part of the inner hole of the continuous casting nozzle to be joined. It is more than an acute angle formed by a straight line in contact with the upper end and lower end of the concave arc portion whose diameter increases upward and the central axis, and the metal case is brought into contact with the continuous casting nozzle and joined to the continuous casting nozzle. It is characterized by.
本発明では、耐火物である下部ノズル本体ではなく、メタルケースが連鋳ノズルと接するので、連鋳ノズルが受けた外力が下部ノズル本体に直接伝播せず、下部ノズルの亀裂発生を抑えることができる。 In the present invention, since the metal case is in contact with the continuous casting nozzle instead of the refractory lower nozzle main body, the external force received by the continuous casting nozzle does not directly propagate to the lower nozzle main body, thereby suppressing the occurrence of cracks in the lower nozzle. it can.
以下、本発明を実施するための最良の形態について、添付図面を参照して詳細に説明する。なお、以下に示す本発明を実施するための形態は、本発明の具体的態様の一例であり、当該形態に限定されるものではない。 The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. In addition, the form for implementing this invention shown below is an example of the specific aspect of this invention, and is not limited to the said form.
図１(ａ)は、下部ノズルと連鋳ノズルとが接合した状態で溶鋼が通過する内孔の軸に沿って当該ノズルを切断した、本発明に係る下部ノズルと連鋳ノズルの接合構造の一例を示す断面図である。 FIG. 1 (a) shows a joining structure of a lower nozzle and a continuous casting nozzle according to the present invention, in which the nozzle is cut along an axis of an inner hole through which molten steel passes in a state where the lower nozzle and the continuous casting nozzle are joined. It is sectional drawing which shows an example.
同図に示すように本発明の接合構造に用いられる下部ノズル１０は、耐火物である下部ノズル本体１１と、下部ノズル本体１１の外周を覆うメタルケース１２とで構成され、下部ノズル本体１１とメタルケース１２との間には、モルタルなどの充填材１３が充填されている。 As shown in the figure, the lower nozzle 10 used in the joining structure of the present invention is composed of a lower nozzle body 11 that is a refractory and a metal case 12 that covers the outer periphery of the lower nozzle body 11. Between the metal case 12, a filler 13 such as mortar is filled.
そして、接合部の拡大図を同図（ｂ）に示すように、本発明に係る接合構造では、下部ノズル本体１１の外周を被覆するメタルケース１２と、連鋳ノズル２０とが直接、若しくは目地材（図示しない）を介して接触することによって、下部ノズル１０と連鋳ノズル２０とが接合している。 And as the enlarged view of a junction part is shown in the figure (b), in the junction structure which concerns on this invention, the metal case 12 and the continuous casting nozzle 20 which coat | cover the outer periphery of the lower nozzle main body 11 are directly or jointly. By contacting through a material (not shown), the lower nozzle 10 and the continuous casting nozzle 20 are joined.
ここで、連鋳ノズル２０の頭部のテーパ部２１が内孔の中心軸３０と成す鋭角をａ、メタルケース１２の外周最下端部１４から下部ノズル本体１１の下端部外面１５に延びる直線３１が内孔の中心軸３２と成す鋭角をｂとすると、ｂ≧ａである。 Here, an acute angle formed by the taper portion 21 of the head of the continuous casting nozzle 20 with the central axis 30 of the inner hole is a straight line 31 extending from the outermost lower end portion 14 of the metal case 12 to the outer surface 15 of the lower end portion of the lower nozzle body 11. If b is an acute angle formed by the central axis 32 of the inner hole, then b ≧ a.
また、下部ノズル本体１１の外周最下端部が円弧形状の場合は、図１(ｃ)に示すように、円弧形状部１６及びメタルケースの外周最下端部１４と接する直線３３が内孔の中心軸３２と成す鋭角をｂ´とすると、ｂ´≧ａである。 Further, when the outermost lower end portion of the lower nozzle body 11 has an arc shape, as shown in FIG. 1 (c), a straight line 33 in contact with the arc-shaped portion 16 and the outermost lower end portion 14 of the metal case is the center of the inner hole. If the acute angle formed with the shaft 32 is b ′, then b ′ ≧ a.
鋭角ｂ、ｂ´が鋭角ａより広い（ｂ、ｂ´＞ａ）と、連鋳ノズル２０の頭部にメタルケース１２が接し、下部ノズル本体１１は、連鋳ノズル２０に接しないため、連鋳ノズル２０が受けた外力が下部ノズル本体１１に直接伝播せず、下部ノズルの亀裂発生が抑えられる。 If the acute angles b and b ′ are wider than the acute angle a (b, b ′> a), the metal case 12 is in contact with the head of the continuous casting nozzle 20 and the lower nozzle body 11 is not in contact with the continuous casting nozzle 20. The external force received by the casting nozzle 20 does not directly propagate to the lower nozzle body 11, and the occurrence of cracks in the lower nozzle is suppressed.
一方、鋭角ｂ、ｂ´と鋭角ａが等しい（ｂ、ｂ´＝ａ）と、下部ノズル本体１１とメタルケース１２の両者が連鋳ノズル２０の頭部に接し、連鋳ノズル２０から下部ノズル本体１１に直接伝播する外力が減少することから、下部ノズルの亀裂発生が抑えられる。さらに、下部ノズル本体１１及びメタルケース１２の両者で接合することによって、耐火物（下部ノズル本体１１）のみで接合する従来の接合構造に比べてシール性は向上する。 On the other hand, when the acute angles b and b ′ are equal to the acute angle a (b, b ′ = a), both the lower nozzle body 11 and the metal case 12 are in contact with the head of the continuous casting nozzle 20, and the continuous casting nozzle 20 to the lower nozzle Since the external force directly propagating to the main body 11 is reduced, the occurrence of cracks in the lower nozzle is suppressed. Furthermore, by joining with both the lower nozzle body 11 and the metal case 12, the sealing performance is improved as compared with the conventional joining structure in which joining is performed only with the refractory (lower nozzle body 11).
なお、下部ノズル本体１１やメタルケース１２と連鋳ノズル２０との間には、モルタル、ジョイントシール材、セラミックスシートなど、またはセラミックスシートとモルタル、ジョイントシール材の併用など、緩衝材となるものを設置することが望ましい。メタルケース１２と連鋳ノズル２０が直接接合すると、連鋳ノズル頭部の亀裂を誘発させる恐れがあり、メタルケース１２が変形する可能性もあるからである。さらに、目地材など、シール材となるものを接合部位近傍に用いることが望ましい。外気流入による溶鋼汚染、耐火物酸化による組織劣化を引き起こす可能性があるからである。 In addition, between the lower nozzle body 11 or the metal case 12 and the continuous casting nozzle 20, a mortar, a joint seal material, a ceramic sheet or the like, or a ceramic sheet, a mortar, and a joint seal material used together as a buffer material. It is desirable to install. This is because if the metal case 12 and the continuous casting nozzle 20 are directly joined, there is a risk of causing cracks in the head of the continuous casting nozzle, and the metal case 12 may be deformed. Furthermore, it is desirable to use a seal material such as a joint material in the vicinity of the joining portion. This is because molten steel contamination due to inflow of outside air and structural deterioration due to refractory oxidation may occur.
また、下部ノズルのメタルケースと接する箇所まで、連鋳ノズルの頭部をメタルケースで覆い、メタルケース同士で接合する構成としてもよい。メタルケース同士を接触させることによって、耐火物への物理的影響が軽減され、下部ノズルの亀裂発生が抑えられる。この際、メタルケースが溶鋼と接触しないように、内孔側を目地材で覆う必要がある。 Moreover, it is good also as a structure which covers the head of a continuous casting nozzle to a location which touches the metal case of a lower nozzle with a metal case, and joins metal cases. By bringing the metal cases into contact with each other, the physical influence on the refractory is reduced, and the occurrence of cracks in the lower nozzle is suppressed. At this time, it is necessary to cover the inner hole side with a joint material so that the metal case does not come into contact with the molten steel.
図２は、下部ノズルの他の形状の一例を示す図である。同図(ａ)に示すように、メタルケースよりも先の下部ノズル下端をテーパ形状としてもよく、当該形状では、テーパ形状先端の下端部外面１５及びメタルケースの外周最下端部１４と接する直線３１が内孔の中心軸３２と成す鋭角ｂが、連鋳ノズルの頭部のテーパ部が内孔の中心軸と成す鋭角ａ以上であればよい。 FIG. 2 is a diagram illustrating an example of another shape of the lower nozzle. As shown in FIG. 5A, the lower end of the lower nozzle ahead of the metal case may be tapered, and in this shape, a straight line that contacts the lower end outer surface 15 of the tapered tip and the outermost lower end 14 of the metal case. The acute angle b formed by 31 with the central axis 32 of the inner hole may be equal to or greater than the acute angle a formed by the taper portion of the head of the continuous casting nozzle with the central axis of the inner hole.
また、図２(ｂ)に示すように、下部ノズル下端のテーパ形状に沿ってメタルケースの下端を伸ばしてもよく、当該形状では、テーパ形状先端の下端部外面１５及び下部ノズルのテーパ形状に沿って伸びたメタルケースの外周最下端部１４と接する直線３１が、内孔の中心軸３２と成す鋭角ｂが、連鋳ノズルの頭部のテーパ部が内孔の中心軸と成す鋭角ａ以上であればよい。 Further, as shown in FIG. 2B, the lower end of the metal case may be extended along the tapered shape of the lower end of the lower nozzle. In this shape, the lower end outer surface 15 of the tapered tip and the tapered shape of the lower nozzle are formed. An acute angle b formed by the straight line 31 in contact with the outermost lowermost end portion 14 of the metal case extending along the central axis 32 of the inner hole is greater than an acute angle a formed by the taper portion of the head of the continuous casting nozzle formed by the central axis of the inner hole. If it is.
ここで、連鋳ノズル２０の頭部の内孔形状としては、例えば、図２(ｃ)に示すように、上端から内孔まで続くテーパ形状や、テーパ形状の下方に水平な水平部２２を設けた形状など、任意の形状を用いることが可能であり、図３(ａ)に示すように、テーパ形状に代えて、内孔外側に向けて広がる凹状の円弧形状に形成してもよい。 Here, as the inner hole shape of the head of the continuous casting nozzle 20, for example, as shown in FIG. 2 (c), a taper shape extending from the upper end to the inner hole, or a horizontal horizontal portion 22 below the taper shape. Arbitrary shapes, such as the provided shape, can be used, and as shown in FIG. 3 (a), instead of the tapered shape, a concave arc shape spreading toward the outside of the inner hole may be formed.
連鋳ノズル頭部の内孔側の形状を円弧形状とした場合には、図３(ｂ)に示すように、下部ノズル本体１１の下端部外面１５及びメタルケース１２の外周最下端部１４と接する直線３１が内孔の中心軸３２と成す鋭角ｂが、円弧の上端２３及び下端２４と接する直線３３が内孔の中心軸３０と成す鋭角ａ以上であればよい。 When the shape of the inner hole side of the head of the continuous casting nozzle is an arc shape, as shown in FIG. 3 (b), the lower end outer surface 15 of the lower nozzle body 11 and the outermost lowermost end portion 14 of the metal case 12 The acute angle b formed by the straight line 31 in contact with the central axis 32 of the inner hole may be equal to or greater than the acute angle a formed by the straight line 33 in contact with the upper end 23 and the lower end 24 of the arc.
本実施例では、図１に示すように、アルミナ・カーボン系の耐火物である下部ノズル本体１１の外周をメタルケース１２で被覆し、下部ノズル本体１１とメタルケース１２との間にモルタル１３を充填した下部ノズル１０を取鍋のスライディングノズル装置（図示しない）に取り付け、連鋳ノズル２０のテーパ部２１に目地材（図示しない）を介して下部ノズル本体１１及びメタルケース１２を接しさせて接合させた。 In this embodiment, as shown in FIG. 1, the outer periphery of the lower nozzle body 11, which is an alumina / carbon refractory, is covered with a metal case 12, and a mortar 13 is provided between the lower nozzle body 11 and the metal case 12. The filled lower nozzle 10 is attached to a sliding nozzle device (not shown) of the pan, and the lower nozzle body 11 and the metal case 12 are brought into contact with the tapered portion 21 of the continuous casting nozzle 20 via a joint material (not shown). I let you.
そして、容量５０ｔの取鍋１杯の溶鋼を溶出させることを１チャージとして、溶鋼を５チャージ溶出させて、下部ノズルの下端欠けや亀裂の発生を目視によって検証した。 Then, elution of one cup of molten steel with a capacity of 50 t was taken as 1 charge, and 5 charges of molten steel were eluted, and the lower end chipping and cracking of the lower nozzle were visually inspected.
また、比較例として、下部ノズルのメタルケース下端の位置を実施例に比べて上方に位置させ、下部ノズル本体のみをロングノズルと接しさせた点を除いて、実施例と同様の構成とした従来の接合構造を用いて、実施例と同様に下部ノズルの下端欠けや亀裂の発生を評価した。 In addition, as a comparative example, the lower nozzle metal case lower end is positioned above the embodiment, and the conventional configuration is the same as the embodiment except that only the lower nozzle body is in contact with the long nozzle. In the same manner as in the example, the lower end chipping and cracking of the lower nozzle were evaluated.
下部ノズル２０本のうち、比較例では、３本で亀裂の発生が確認されたのに対して、実施例では、亀裂の発生が確認されなかった。 Of the 20 lower nozzles, in the comparative example, the occurrence of cracks was confirmed in three, whereas in the example, the occurrence of cracks was not confirmed.
なお、下部ノズルは、長さ２４０ｍｍ、上端大径部直径１５０ｍｍ、下端小径部直径１１０ｍｍ、内孔直径５０ｍｍである。また、メタルケースは、厚さ１.２ｍｍであり、下端の位置は、実施例では、下部ノズル本体下端から１０ｍｍ上方、比較例では、下部ノズル本体下端から２０ｍｍ上方である。 The lower nozzle has a length of 240 mm, an upper end large diameter portion diameter of 150 mm, a lower end small diameter portion diameter of 110 mm, and an inner hole diameter of 50 mm. The metal case has a thickness of 1.2 mm, and the position of the lower end is 10 mm above the lower end of the lower nozzle body in the embodiment, and 20 mm above the lower end of the lower nozzle body in the comparative example.
次に、図４（ａ）左側に示すように、実施例における下部ノズル１０の連鋳ノズルが接触する位置に剛体４０を接触させ、この剛体４０に０.５ｍｍの強制変位を与え、ＦＥＭ(Finite Element Method)解析を行った。また、比較例における下部ノズルについても、図４（ｂ）左側に示すように、剛体４０を接触させ、同様にＦＥＭ解析を行った。解析結果を図４(ａ)、(ｂ)の右側に示す。 Next, as shown on the left side of FIG. 4 (a), the rigid body 40 is brought into contact with a position where the continuous casting nozzle of the lower nozzle 10 in the embodiment contacts, and a forced displacement of 0.5 mm is given to the rigid body 40, and FEM ( Finite Element Method) was analyzed. Further, the lower nozzle in the comparative example was also brought into contact with the rigid body 40 as shown on the left side of FIG. The analysis results are shown on the right side of FIGS. 4 (a) and 4 (b).
下部ノズル本体と剛体とが接し、メタルケースを剛体と接しさせない比較例では、図４(ｂ)に示すように、下部ノズル本体に大きな応力（最大８.６ＭＰａ）が発生しているのに対し、メタルケースを剛体と接しさせる実施例では、図４(ａ)に示すように、比較例に比べて下部ノズル本体に発生する応力が大きく低下している（最大２.３ＭＰａ）ことが確認された。 In the comparative example in which the lower nozzle body is in contact with the rigid body and the metal case is not in contact with the rigid body, a large stress (maximum 8.6 MPa) is generated in the lower nozzle body as shown in FIG. In the embodiment in which the metal case is in contact with the rigid body, as shown in FIG. 4A, it is confirmed that the stress generated in the lower nozzle body is greatly reduced (up to 2.3 MPa) as compared with the comparative example. It was.
このように本発明では、取鍋での実績やＦＥＭ解析の結果から明らかなように、下部ノズル本体に対して働く外部からの応力が抑えられ、下部ノズル本体の下端割れや亀裂発生を抑えることができる。 As described above, in the present invention, as is clear from the results in the ladle and the results of the FEM analysis, the external stress acting on the lower nozzle body is suppressed, and the lower end crack and crack generation of the lower nozzle body are suppressed. Can do.
従って、下部ノズルの寿命が向上すると共に、トラブルの発生確率が低下し、さらに、下部ノズルの寿命向上によって産業廃棄物の減少が期待できる。 Therefore, the lifetime of the lower nozzle is improved, the probability of occurrence of trouble is lowered, and further, the reduction of industrial waste can be expected by improving the lifetime of the lower nozzle.
１０…下部ノズル、１１…下部ノズル本体、１２…メタルケース、１３…充填材、１４…メタルケース外周最下端部、１５…下部ノズル本体下端部、１６…円弧形状部、２０…連鋳ノズル、２１…テーパ部、２２…水平部、２３…円弧上端、２４…円弧下端、３０、３２…中心軸、３１、３３…直線、４０…剛体、１００…ＳＮ装置、１０１…上部プレート、１０２…下部プレート、１０３…下部ノズル、１０４…下部ノズル本体、１０５…メタルケース、１１０…連鋳ノズル。 DESCRIPTION OF SYMBOLS 10 ... Lower nozzle, 11 ... Lower nozzle main body, 12 ... Metal case, 13 ... Filler, 14 ... Metal case outer periphery lowermost end part, 15 ... Lower nozzle main body lower end part, 16 ... Arc-shaped part, 20 ... Continuous casting nozzle, DESCRIPTION OF SYMBOLS 21 ... Tapered part, 22 ... Horizontal part, 23 ... Arc upper end, 24 ... Arc lower end, 30, 32 ... Center axis, 33, 33 ... Straight line, 40 ... Rigid body, 100 ... SN device, 101 ... Upper plate, 102 ... Lower part Plate, 103 ... Lower nozzle, 104 ... Lower nozzle body, 105 ... Metal case, 110 ... Continuous casting nozzle.
Claims (4)
前記連鋳ノズルは、溶鋼が通過する内孔の上部に上方に向かって拡径するテーパ部を備え、
前記下部ノズルは、下部ノズル本体の外周を被覆するメタルケースを備え、
前記メタルケースの外周側最下端及び前記下部ノズル本体の下端部外面と接する直線と前記内孔の中心軸とが成す鋭角は、前記テーパ部のテーパを延長した延長線と前記中心軸とが成す鋭角以上であり、
前記連鋳ノズルと該メタルケースは、直接または目地材を介して接している
ことを特徴とする接合構造。 It is a joining structure of a lower nozzle and a continuous casting nozzle of a sliding nozzle device that controls the amount of molten steel by sliding the lower plate,
The continuous casting nozzle is provided with a taper portion whose diameter is expanded upward at an upper portion of an inner hole through which molten steel passes,
The lower nozzle includes a metal case that covers the outer periphery of the lower nozzle body,
The acute angle formed by the straight line in contact with the outermost lower end of the outer periphery of the metal case and the outer surface of the lower end of the lower nozzle body and the central axis of the inner hole is formed by an extension line extending the taper of the tapered portion and the central axis. More than an acute angle,
The continuous casting nozzle and the metal case are in contact with each other directly or via a joint material.
前記連鋳ノズルは、溶鋼が通過する内孔の上部に上方に向かって拡径する凹状の円弧部を備え、
前記下部ノズルは、下部ノズル本体の外周を被覆するメタルケースを備え、
前記メタルケースの外周側最下端及び前記下部ノズル本体の下端部外面と接する直線と前記内孔の中心軸とが成す鋭角は、前記円弧部の上端及び下端と接する直線と前記中心軸とが成す鋭角以上であり、
前記連鋳ノズルと該メタルケースは、直接または目地材を介して接している
ことを特徴とする接合構造。 It is a joining structure of a lower nozzle and a continuous casting nozzle of a sliding nozzle device that controls the amount of molten steel by sliding the lower plate,
The continuous casting nozzle includes a concave arc portion whose diameter is increased upward at the upper portion of the inner hole through which the molten steel passes,
The lower nozzle includes a metal case that covers the outer periphery of the lower nozzle body,
The acute angle formed by the straight line in contact with the outermost lower end of the metal case and the outer surface of the lower end of the lower nozzle body and the central axis of the inner hole is formed by the straight line in contact with the upper and lower ends of the arc part and the central axis. More than an acute angle,
The continuous casting nozzle and the metal case are in contact with each other directly or via a joint material.
下部ノズル本体と、
前記下部ノズル本体の外周を被覆するメタルケースと
を具備し、
前記メタルケースの外周側最下端及び前記下部ノズル本体の下端部外面と接する直線と溶鋼が通過する内孔の中心軸とが成す鋭角は、接合する連鋳ノズルの内孔の上部に形成された上方に向かって拡径するテーパ部のテーパを延長した延長線と前記中心軸とが成す鋭角以上であり、前記メタルケースを前記連鋳ノズルと接しさせて該連鋳ノズルと接合する
ことを特徴とする下部ノズル。 A lower nozzle of a sliding nozzle device that controls the amount of molten steel by sliding a lower plate,
A lower nozzle body,
A metal case covering the outer periphery of the lower nozzle body;
The acute angle formed by the straight line in contact with the outermost lower end of the metal case and the outer surface of the lower end of the lower nozzle body and the central axis of the inner hole through which the molten steel passes is formed at the upper part of the inner hole of the continuous casting nozzle to be joined. The taper of the taper portion whose diameter increases toward the upper side is an acute angle formed by an extension line extending the taper and the central axis, and the metal case is brought into contact with the continuous casting nozzle and joined to the continuous casting nozzle. And lower nozzle.
下部ノズル本体と、
前記下部ノズル本体の外周を被覆するメタルケースと
を具備し、
前記メタルケースの外周側最下端及び前記下部ノズル本体の下端部外面と接する直線と溶鋼が通過する内孔の中心軸とが成す鋭角は、接合する連鋳ノズルの内孔の上部に形成された上方に向かって拡径する凹状の円弧部の上端及び下端と接する直線と前記中心軸とが成す鋭角以上であり、前記メタルケースを前記連鋳ノズルと接しさせて該連鋳ノズルと接合する
ことを特徴とする下部ノズル。 A lower nozzle of a sliding nozzle device that controls the amount of molten steel by sliding a lower plate,
A lower nozzle body,
A metal case covering the outer periphery of the lower nozzle body;
The acute angle formed by the straight line in contact with the outermost lower end of the metal case and the outer surface of the lower end of the lower nozzle body and the central axis of the inner hole through which the molten steel passes is formed at the upper part of the inner hole of the continuous casting nozzle to be joined. It is more than an acute angle formed by a straight line in contact with the upper end and lower end of the concave arc portion whose diameter increases upward and the central axis, and the metal case is brought into contact with the continuous casting nozzle and joined to the continuous casting nozzle. Lower nozzle characterized by
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|---|---|---|---|---|
| JP2000190067A (en) * | 1998-12-22 | 2000-07-11 | Nkk Corp | Rotary nozzle device for casting |
| JP2000246428A (en) * | 1999-03-02 | 2000-09-12 | Kawasaki Refract Co Ltd | Nozzle for injecting molten metal and method for producing the same |
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2008
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| JP2000190067A (en) * | 1998-12-22 | 2000-07-11 | Nkk Corp | Rotary nozzle device for casting |
| JP2000246428A (en) * | 1999-03-02 | 2000-09-12 | Kawasaki Refract Co Ltd | Nozzle for injecting molten metal and method for producing the same |
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| JP2021504146A (en) * | 2018-02-22 | 2021-02-15 | ヒュンダイ スチール カンパニー | Collector nozzle for continuous casting |
| US11389863B2 (en) | 2018-02-22 | 2022-07-19 | Hyundai Steel Company | Collector nozzle for continuous casting |
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