JP4181904B2

JP4181904B2 - Continuous casting mold

Info

Publication number: JP4181904B2
Application number: JP2003072471A
Authority: JP
Inventors: 勇一小川
Original assignee: Mishima Kosan Co Ltd
Current assignee: Mishima Kosan Co Ltd
Priority date: 2003-03-17
Filing date: 2003-03-17
Publication date: 2008-11-19
Anticipated expiration: 2023-03-17
Also published as: JP2004276080A

Description

【０００１】
【発明の属する技術分野】
本発明は、鋳型本体の裏面側に取付け手段によって支持部材を固定する連続鋳造用鋳型に関するものであり、取付け手段近傍の鋳型本体の冷却効率を高めた連続鋳造用鋳型に関する。
【０００２】
【従来の技術】
従来、連続鋳造設備で使用される連続鋳造用鋳型（以下、単に鋳型とも言う）７０は、図７に示すように、一対の幅狭冷却部材である短辺部材７１、７２と、この短辺部材７１、７２を挟み込むように配置される一対の幅広冷却部材である長辺部材７３、７４とを備え、この向い合う長辺部材７３、７４の両端部にそれぞれボルト７５を取付け、バネを介してナット７６で固定した構成となっている。
この短辺部材７１、７２は鏡面対称で同じ構成となっており、図７、図８（Ａ）、（Ｂ）に示すように、それぞれ裏面側の上下方向に多数の導水溝７７が設けられた短辺銅板７８と、短辺銅板７８の裏面側にボルト７９によって固定されたバックプレート８０（冷却箱、水箱とも言う）とを有している。そして、バックプレート８０の上端部及び下端部にそれぞれ設けられた排水部８１及び給水部８２を介して導水溝７７に冷却水の一例である工業用水を流すことで、短辺銅板７８の冷却を行っている。一方、長辺部材７３、７４も略同じ構成となっているが、長辺部材７３、７４の長辺銅板８１の幅は、短辺部材７１、７２の短辺銅板７８の幅より長く、この長辺銅板８１の裏面側にそれぞれ固定されたバックプレート８２の幅が、長辺銅板８１の幅より長くなっている。
なお、この短辺部材７１、７２の短辺銅板７８と、長辺部材７３、７４の長辺銅板８１とで鋳型本体８３が構成されている。
【０００３】
連続鋳造作業時においては、上記した連続鋳造鋳型７０の上方（短辺銅板７８、長辺銅板８１の上側）から溶鋼を注ぎ、この鋳型７０により製品となる鋳片の初期凝固を行い、凝固した鋳片を鋳型７０下方より連続して引抜いて製造している。なお、鋳型７０に注がれる溶鋼温度及び鋳型７０出口の鋳片の表面温度は操業条件により異なるが、通常、溶鋼温度は約１５００℃程度であり、鋳型７０出口の鋳片の表面温度は８００〜１２００℃である。ここでの鋳片の内部は未凝固状態、即ち液体状態となっている。
溶鋼は上述したように高温であり、短辺銅板７８及び長辺銅板８１を十分冷却しないとその温度が上昇するため、短辺銅板７８及び長辺銅板８１の温度を、銅の強度が低下しない程度の温度以下に保つ必要がある。
【０００４】
そこで、短辺銅板７８及び長辺銅板８１の温度を十分に低く、且つ均一な温度分布になるようにするため、短辺銅板７８及び長辺銅板８１の裏面側に設けられている冷却水を通す多数の導水溝７７の位置調整を行う色々な技術が提案されてきた。
例えば、特許文献１に記載のように、短辺銅板及び長辺銅板の特にメニスカス部近傍から１００ｍｍ以内の範囲内におけるボルト間の導水溝を、その間隔が小さくなるようボルト側に所要寸法迂回させて通水し、冷却効率が低下するボルト近傍の冷却を行う方法が開示されている。
また、特許文献２に記載のように、短辺銅板及び長辺銅板の端部に位置する導水溝の断面形状を、短辺銅板及び長辺銅板の厚み方向に対して斜めに傾斜させた形状とし、冷却効率が低下する短辺銅板及び長辺銅板の幅方向端部の冷却効率を高める連続鋳造用鋳型も開示されている。
【０００５】
【特許文献１】
特開平２−５９１４４号公報（第１図）
【特許文献２】
実開昭６１−３６３４１号公報（第６図）
【０００６】
【発明が解決しようとする課題】
しかしながら、上記した連続鋳造用鋳型には、以下の問題がある。
ボルト間の導水溝をその間隔が小さくなるようボルト側に迂回させ、ボルト近傍の冷却を行った場合、ボルト近傍の冷却効率は高められる。しかし、上下のボルト間で隣り合う導水溝の間隔が小さくなるように、導水溝を一側（ボルト側）に迂回させることで、他側に位置する導水溝と迂回した導水溝との間隔が開き、この部分の冷却効率が低下してしまう。
また、短辺銅板及び長辺銅板の端部に設けられる導水溝の断面形状を、短辺銅板及び長辺銅板の厚み方向に対して斜めに傾斜させた形状とし、短辺銅板及び長辺銅板の端部の冷却を行った場合、導水溝を傾斜させないときよりも端部の冷却効率は高められる。しかし、導水溝の断面形状は、斜めに傾斜した形状となったもので、鋳型本体の冷却面側及び冷却効率が低下する部分を適切に冷却できるものではなく、鋳型本体の冷却面側及び端部の冷却効率を必要となる程度まで十分に高められるものではない。
【０００７】
このため、鋳型本体の同一高さの冷却面において、他の部分よりも温度が上昇する部分が発生するので、例えば鋳型本体に局部的な摩耗が発生し、鋳型の寿命が低下する問題がある。また、鋳型本体の同一高さの冷却面において、温度分布にばらつきが生じ、鋳片の冷却が不均一となり、製造した製品の品質が低下する問題も生じる。
本発明はかかる事情に鑑みてなされたもので、鋳型本体の寿命を向上させ、しかも良好な品質を備えた鋳片を製造可能な連続鋳造用鋳型を提供することを目的とする。
【０００８】
【課題を解決するための手段】
前記目的に沿う第１の発明に係る連続鋳造用鋳型は、熱伝導性が良好な金属からなり、裏面側に通水部が設けられた鋳型本体と、該鋳型本体の裏面側に取付け手段によって固定された支持部材とを有し、該支持部材に設けられた給水部及び排水部を介して前記通水部に冷却水を流すことで前記鋳型本体の冷却を行う連続鋳造用鋳型において、
前記通水部は前記鋳型本体の裏面側一面に設けられた多数の導水溝を備え、前記取付け手段を挟んで配置される導水溝に他の導水溝より幅広の拡幅部をそれぞれ設け、しかも前記鋳型本体の裏面側に前記各拡幅部を繋げる連通部を形成し、
前記各拡幅部の深さ方向にそれぞれ配置され、しかも該各拡幅部の一方側の内面と他方側の内面にそれぞれ当接して、前記鋳型本体の冷却面側及び前記取付け手段側の冷却を行う断面Ｌ字状の導水部を形成する閉塞部材と、該各閉塞部材をその側部で一体的に接続する連結部を有し、更に前記各閉塞部材と前記連結部の断面形状をコ字状とし、該連結部を前記連通部に取付けて前記支持部材に当接させ、
前記導水部の断面積を該導水部以外の導水溝の断面積以下にして、前記導水部を通過する前記冷却水の速度を前記導水部以外の導水溝を通過する前記冷却水の速度と同等又はそれ以上にし、前記取付け手段近傍の前記鋳型本体の冷却効率を高める。
このように、取付け手段近傍の導水溝に他の導水溝より幅広の拡幅部を設けるので、鋳型本体の冷却面側の冷却を行うと共に、取付け手段側の冷却も行うことが可能になる。
また、拡幅部の深さ方向の一部に閉塞部材を配置して導水部を設け、この導水部を通過する冷却水の速度を導水部以外の導水溝を通過する冷却水の速度と同等又はそれ以上にし、取付け手段近傍の鋳型本体の冷却効率を高めるので、鋳型本体の同一高さ位置における温度分布を略均一にできる。
【０００９】
拡幅部は取付け手段を挟んで配置される導水溝にそれぞれ設けられているので、例えば導水溝を取付け手段側へ大きく迂回させることなく、取付け手段近傍の冷却を行うことができる。
各拡幅部にそれぞれ配置される閉塞部材は、連結部によって一体的に接続されているので、各拡幅部に対して個別に閉塞部材を配置する必要性がない。また、鋳型本体の裏面側に形成された連通部に連結部を配置するので、各拡幅部に対する閉塞部材の取付けを、例えばボルト等を用いることなく、確実で容易に行うことができる。
【００１０】
導水部の断面形状をＬ字状として、鋳型本体の冷却面側及び取付け手段側の冷却を行うので、簡単な形状で冷却効率を高めたい部分の冷却を適切に行うことができる。
前記目的に沿う第２の発明に係る連続鋳造用鋳型は、第１の発明に係る連続鋳造用鋳型において、前記拡幅部は前記鋳型本体の上下方向に隣り合う取付け手段の間に向かって幅広となっている。
このように、拡幅部は隣り合う取付け手段の間に向かって幅広となっているので、例えば新たに導水溝を設けることなく、冷却効率を高めたい部分の冷却を適切に行うことができる。
前記目的に沿う第３の発明に係る連続鋳造用鋳型は、第１、第２の発明に係る連続鋳造用鋳型において、前記拡幅部は少なくともメニスカス部に設けられている。
このように、拡幅部は少なくともメニスカス部に設けられているので、鋳型本体で最も高温となる部分の冷却を適切に行うことができる。
【００１１】
【発明の実施の形態】
続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
ここに、図１は本発明の一実施の形態に係る連続鋳造用鋳型の鋳型本体の短辺銅板の説明図、図２（Ａ）、（Ｂ）はそれぞれ図１のａ−ａ矢視断面図、ｂ−ｂ矢視断面図、図３（Ａ）、（Ｂ）はそれぞれ図１のｃ−ｃ矢視断面図、ｄ−ｄ矢視断面図、図４は数値解析に使用した短辺銅板のメニスカス部の断面形状を示す説明図、図５は同短辺銅板の導水溝を流れる冷却水の数値解析に使用した水路モデルの説明図、図６（Ａ）、（Ｂ）はそれぞれ数値解析結果に基づく同短辺銅板のメニスカス部の温度分布の説明図、従来例に係る短辺銅板のメニスカス部の数値解析結果に基づく温度分布の説明図である。
【００１２】
図１〜図３に示すように、本発明の一実施の形態に係る連続鋳造用鋳型（以下、単に鋳型とも言う）１０は、一対の幅狭冷却部材である短辺部材１１、１２と、一対の幅広冷却部材である長辺部材（図示しない）とを組合せることで製造されるものである（図７参照）。
【００１３】
この連続鋳造用鋳型１０の短辺部材１１、１２は、それぞれ熱伝導性が良好な金属の一例である銅からなり、裏面側に通水部１３が設けられた短辺銅板１４と、短辺銅板１４の裏面側に取付け手段１５によって固定された支持部材の一例であるバックプレート（冷却箱、水箱とも言う）１６とを有し、バックプレート１６に設けられた給水部１７及び排水部１８を介して通水部１３に冷却水の一例である工業用水を流すことで短辺銅板１４の冷却を行うものである。この短辺銅板１４の表面（冷却面）には、例えばＮｉ、Ｎｉ−Ｃｏ合金等の被覆材が、めっき又は溶射されている。なお、連続鋳造用鋳型１０の長辺部材も、上記した短辺部材１１、１２と略同様の構成であり、短辺部材１１、１２の短辺銅板１４と長辺部材の長辺銅板とで鋳型本体が構成され、しかも鋳型本体の内側には、鋳型空間が形成されている。
このように、長辺銅板は短辺銅板（以下、単に銅板とも言う）１４と幅が異なるのみであるため説明を省略し、以下、短辺銅板１４についてのみ詳しく説明する。
【００１４】
図１、図２（Ａ）、（Ｂ）に示すように、銅板１４（例えば、厚み１０〜１００ｍｍ程度）は、銅板１４に形成されている雌ねじ部（本実施の形態においては１４箇所）と、雌ねじ部に螺合してバックプレート１６を締着する雄ねじとからなる取付け手段１５により、例えばステンレスからなるバックプレート１６（例えば、厚み５０〜５００ｍｍ程度）に固定されている。なお、バックプレート１６の給水部１７、排水部１８、及び銅板１４の通水部１３を囲むバックプレート１６の周辺部には溝が形成され、ここにＯリング１９を配置することで、銅板１４とバックプレート１６との密着性を向上させ、通水部１３からの工業用水の漏れを防止している。また、雄ねじを取付けるため、バックプレート１６に形成された孔（本実施の形態においては１２箇所）には、予め防水可能なシール座金が配置されており、雄ねじを取付けた部分からの工業用水の漏れを防止している。
これにより、バックプレート１６の下側の給水部１７に設けられた給水口（図示しない）から工業用水を供給し、給水部１７によって通水部１３を幅方向に均一に、しかも銅板１４の下側から上側にかけて流れた工業用水を、バックプレート１６の上側の排水部１８に設けられた排水口（図示しない）から排出し、銅板１４の冷却を行っている。
【００１５】
図１、図２（Ａ）、（Ｂ）、図３（Ａ）、（Ｂ）に示すように、通水部１３は銅板１４の裏面側一面に設けられた多数の導水溝２０〜２２を備えている。これらの導水溝２０〜２２は、それぞれ通水部１３の流水方向に向けて実質的に直線状となっており、しかも所定ピッチ（例えば、１０〜４０ｍｍ程度）で形成されている。
銅板１４の中央部に設けられた複数（本実施の形態では５本）の導水溝２０は、その下端部から上端部まで実質的に同一の断面形状を備えている。この導水溝２０の溝底から銅板１４とバックプレート１６との接合面（銅板１４の裏面）までの距離Ｄ１は、例えば銅板１４の厚みの１／３〜２／３程度であり、その幅Ｗ１は、例えば距離Ｄ１の１／１０〜１／２程度である。
【００１６】
また、取付け手段１５近傍、即ち銅板１４の幅方向両端部にそれぞれ位置し、取付け手段１５を挟んで配置される導水溝２１、２２も、メニスカス部に位置する部分以外は、上記した導水溝２０の形状と実質的に同一である。この導水溝２１、２２のメニスカス部に位置する部分には、拡幅部２３、２４がそれぞれ設けられている。この拡幅部２３、２４は、鋳型本体の上下方向に隣り合う取付け手段１５の間に向かってそれぞれ幅広となっており、その幅Ｗ２、Ｗ３が、上記した導水溝２０の幅Ｗ１の例えば１．５〜５倍となっている。また、導水溝２１、２２の底から銅板１４の裏面までの距離Ｄ２、Ｄ３は、上記した導水溝２０の距離Ｄ１と略同じ程度になっている。
なお、銅板１４の幅方向両端部に配置された導水溝２２と、更に各導水溝２２の外側に配置され、Ｏリング１９の冷却を行う断面円形の通水孔２５には、給水部１７に連通する通水路２６を介して工業用水が送り込まれ、排水部１８に連通する通水路２７を介して工業用水が排出される。
【００１７】
この拡幅部２３、２４の深さ方向の一部には、錆びにくい素材である例えば、ステンレス板、銅板等で構成された閉塞部材２８、２９がそれぞれ配置されている。閉塞部材２８は、その厚みＴ１が導水溝２１の溝底から銅板１４の裏面までの距離Ｄ２の例えば１／２〜９／１０となっており、また幅Ｗ４が、拡幅部２３の幅Ｗ２の例えば１／３〜９／１０となっている。なお、閉塞部材２８の一端面は拡幅部２３の一方側の内面、即ち銅板１４の幅方向中央側の内面に当接している。
また、閉塞部材２９は、その厚みＴ２が導水溝２２の底から銅板１４の裏面までの距離Ｄ３の例えば１／２〜９／１０となっており、また幅Ｗ５が、拡幅部２４の幅Ｗ３の例えば１／３〜９／１０となっている。なお、閉塞部材２９の他端面は拡幅部２４の他方側の内面、即ち銅板１４の幅方向端側の内面に当接している。
ここで、閉塞部材２８、２９の上下方向両端部は、それぞれ曲面で構成されているため、短辺部材１１、１２を下方から上方へかけて流れる工業用水の流れに対する抵抗を小さくできる。
【００１８】
これにより、各導水溝２１、２２の拡幅部２３、２４に設けられた導水部３０、３１の断面形状は、それぞれ実質的にＬ字状となるので、銅板１４の冷却面側及び取付け手段１５側の銅板１４の内部の冷却を適切に行うことが可能になる。
ここで、各導水部３０、３１の断面積が、導水溝２１、２２の他の部分（導水部３０、３１以外の部分）の断面積以下となるように、拡幅部２３、２４の距離Ｄ２、Ｄ３及び幅Ｗ２、Ｗ３と、閉塞部材２８、２９の厚みＴ１、Ｔ２及び幅Ｗ４、Ｗ５をそれぞれ設定する。これにより、各導水部３０、３１を通過する工業用水の速度を、導水部３０、３１以外の導水溝２１、２２を通過する工業用水の速度と同等又はそれ以上にできるので、取付け手段１５近傍の銅板１４の冷却効率を高めることが可能になる。従って、従来と同様の流量の工業用水を利用して、より良い冷却効率が得られ経済的である。
【００１９】
各閉塞部材２８、２９は、その間に配置される連結部３２によって一体的に接続され、各閉塞部材２８、２９、及び連結部３２の断面形状が実質的にコ字状になっている。
この連結部３２は、バックプレート１６に当接可能なように、各閉塞部材２８、２９の側部に一体的に設けられており、銅板１４の裏面側に形成され各拡幅部２３、２４を繋げる連通部３３に、配置可能な構成となっている。
これにより、銅板１４の裏面側から、一体となった各閉塞部材２８、２９、及び連結部３２を、各拡幅部２３、２４及び連通部３３に配置し、銅板１４の裏面にバックプレート１６を取付け固定することで、各閉塞部材２８、２９、及び連結部３２を目的とする場所に確実に固定できる。
【００２０】
（数値解析）
続いて、前記した連続鋳造用鋳型１０の短辺銅板１４を使用し、流体解析（ＦＥＭ解析）を行った結果について説明する。
流体解析に使用した短辺銅板１４の各寸法は、図４に示すように、短辺銅板１４の厚みが４５ｍｍ、導水溝２０の幅Ｗ１が５ｍｍ、導水溝２１の導水部３０の幅Ｗ２が１５ｍｍ、導水溝２２の導水部３１の幅Ｗ３が１０ｍｍ、導水溝２０の距離Ｄ１が２３ｍｍ、導水部３０の｛（距離Ｄ２）−（厚みＴ１）｝が５ｍｍ、導水部３１の｛（距離Ｄ３）−（厚みＴ２）｝が７ｍｍ、導水部３０の｛（幅Ｗ２）−（幅Ｗ４）｝が４ｍｍ、導水部３１の｛（幅Ｗ３）−（幅Ｗ５）｝が５ｍｍである。また、通水孔２５の直径は１０ｍｍである。なお、冷却水の物性値は、温度が３０℃、密度が９９５．７ｋｇ／ｍｍ³、粘性が８．００×１０^-4Ｐａ・ｓと仮定している。
ここで、銅板１４の各導水溝２０〜２２の本数、及びΔＰ＝１．２９（ｋｇ／ｃｍ²）の圧力で１面当り５７５（Ｌ／ｍｉｎ）の冷却水を流した場合の各導水溝２０〜２２、及び通水孔２５の流速、流量を表１にそれぞれ示す。
【００２１】
【表１】

【００２２】
このとき、給水部１７から各導水溝２１、２２を介して排水部１８へ流れる冷却水は、図５に示すような流れになっている。
上記した形状の導水溝２０〜２２を使用して、伝熱解析を行った結果、図６（Ａ）に示すように、導水溝２０の溝底の温度は１２８℃となり、従来冷却効率が悪かった取付け手段１５近傍の導水溝２１、２２の各溝底の温度でも１３３℃になる。このように、各導水溝２０〜２２の溝底の温度は１２８〜１３３℃の温度範囲にある。なお、銅板１４の表面側の通水孔２５の温度は１３１℃である。これにより、例えば冷却水背圧を０．２（ＭＰａ）としたときの水の沸点温度１３３℃を下回り、スケール付着の促進を抑えることが可能となる。
このとき、銅板１４の冷却面側の温度分布は、幅方向の端の温度３２１℃を除けば、３０６〜３１０℃の温度範囲で分布しており、略均一な温度分布が得られることが分かる。
【００２３】
一方、従来のように、拡幅部がない導水溝３４、３５（取付け手段近傍の導水溝３５の溝底のみが、他の導水溝３４の溝底よりも短辺銅板３６の冷却面側へ突出している）を使用して、解析を行った結果、図６（Ｂ）に示すように、各導水溝３４、３５の溝底の温度は１２０〜１４２℃となり、例えば冷却水背圧を０．２（ＭＰａ）としたときの水の沸点温度１３３℃を上回り、スケールの付着が促進される。なお、銅板３６の表面側の通水孔３７の温度は１４１℃であった。
このとき、銅板３６の冷却面側の温度分布も、幅方向の端の温度３３７℃を除いて、短辺銅板３６の幅方向に３１１〜３２５℃の温度範囲でばらついている。
以上のことから、連続鋳造用鋳型１０を使用することで、鋳型本体の寿命を向上させることができると共に、良好な品質を備えた鋳片を製造できる。
【００２４】
以上、本発明を、一実施の形態を参照して説明してきたが、本発明は何ら上記した実施の形態に記載の構成に限定されるものではなく、特許請求の範囲に記載されている事項の範囲内で考えられるその他の実施の形態や変形例も含むものである。例えば、前記したそれぞれの実施の形態や変形例の一部又は全部を組合せて本発明の連続鋳造用鋳型を構成する場合も本発明の権利範囲に含まれる。
前記実施の形態においては、熱伝導性が良好な金属として銅を使用した場合について説明したが、熱伝導性が良好であれば、例えば他の金属や銅合金等を使用することも可能である。
また、前記実施の形態においては、取付け手段を挟んで配置される導水溝に、拡幅部をそれぞれ設けた。
【００２５】
そして、前記実施の形態においては、拡幅部をメニスカス部に設けた場合について説明したが、拡幅部が少なくともメニスカス部に設けられていれば、取付け手段近傍の導水溝の下方から上方へかけて設けることも可能である。このとき、鋳型本体の温度は、鋳型本体の下側からメニスカス部へかけて徐々に高くなり易いので、この温度分布を考慮して鋳型本体の下側からメニスカス部へかけて導水溝の幅を徐々に広くすることも可能である。
更に、前記実施の形態においては、各導水溝の底を、鋳型本体の厚み方向に対して略同一位置とした場合について説明した。しかし、鋳型本体による鋳片の冷却効率を高めるため、各導水溝毎にその深さを変えたり、また各導水溝の深さを部分的に深くしたり、浅くしたりすることも可能である。
【００２６】
【発明の効果】
請求項１〜３記載の連続鋳造用鋳型においては、取付け手段近傍の導水溝に他の導水溝より幅広の拡幅部を設けるので、鋳型本体の冷却面側の冷却を行うと共に、取付け手段側の冷却も行うことが可能になる。これにより、鋳型本体の同一高さの冷却面において、従来他の部分よりも温度が上昇していた取付け手段近傍の鋳型本体の温度上昇を抑制、更には防止できるので、連続鋳造用鋳型の寿命を向上させることができる。
また、拡幅部の深さ方向の一部に閉塞部材を配置して導水部を設け、この導水部を通過する冷却水の速度を導水部以外の導水溝を通過する冷却水の速度と同等又はそれ以上にし、取付け手段近傍の鋳型本体の冷却効率を高めるので、鋳型本体の同一高さ位置における温度分布を略均一にできる。これにより、鋳片の冷却を略均一に行うことができ、良好な品質を備えた鋳片を製造できる。
【００２７】
特に、請求項１記載の連続鋳造用鋳型においては、拡幅部が取付け手段を挟んで配置される導水溝にそれぞれ設けられているので、例えば導水溝を取付け手段側へ大きく迂回させることなく、取付け手段近傍の冷却を行うことができる。これにより、導水溝を通過する冷却水も安定に流れるので、鋳型本体の中で最も冷却効率が悪くなる部分の冷却を適切に行うことができる。
請求項１記載の連続鋳造用鋳型においては、各拡幅部にそれぞれ配置される閉塞部材は、連結部によって一体的に接続されているので、各拡幅部に対して個別に閉塞部材を配置する必要性がない。また、鋳型本体の裏面側に形成された連通部に連結部を配置するので、各拡幅部に対する閉塞部材の取付けを、例えばボルト等を用いることなく、確実で容易に行うことができる。これにより、連続鋳造用鋳型の構成を簡単にでき、連続鋳造用鋳型の製造時における作業性が良好になる。
【００２８】
請求項１記載の連続鋳造用鋳型においては、導水部の断面形状をＬ字状として、鋳型本体の冷却面側及び取付け手段側の鋳型本体の内部の冷却を行うので、簡単な形状で冷却効率を高めたい部分の冷却を適切に行うことができる。これにより、更に良好な品質を備えた鋳片を製造できる。
請求項２記載の連続鋳造用鋳型においては、拡幅部が隣り合う取付け手段の間に向かって幅広となっているので、例えば新たに導水溝を設けることなく、冷却効率を高めたい部分の冷却を適切に行うことができる。これにより、導水溝の形状を簡単にできるので、鋳型本体の製造作業が容易になる。
請求項３記載の連続鋳造用鋳型においては、拡幅部が少なくともメニスカス部に設けられているので、鋳型本体で最も高温となる部分の冷却を適切に行うことができる。これにより、連続鋳造用鋳型の寿命を向上させることができ、経済的である。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る連続鋳造用鋳型の鋳型本体の短辺銅板の説明図である。
【図２】（Ａ）、（Ｂ）はそれぞれ図１のａ−ａ矢視断面図、ｂ−ｂ矢視断面図である。
【図３】（Ａ）、（Ｂ）はそれぞれ図１のｃ−ｃ矢視断面図、ｄ−ｄ矢視断面図である。
【図４】数値解析に使用した短辺銅板のメニスカス部の断面形状を示す説明図である。
【図５】同短辺銅板の導水溝を流れる冷却水の数値解析に使用した水路モデルの説明図である。
【図６】（Ａ）、（Ｂ）はそれぞれ数値解析結果に基づく同短辺銅板のメニスカス部の温度分布の説明図、従来例に係る短辺銅板のメニスカス部の数値解析結果に基づく温度分布の説明図である。
【図７】連続鋳造鋳型の平面図である。
【図８】（Ａ）は従来例に係る短辺銅板の説明図、（Ｂ）は（Ａ）のｅ−ｅ矢視断面図である。
【符号の説明】
１０：連続鋳造用鋳型、１１、１２：短辺部材、１３：通水部、１４：短辺銅板、１５：取付け手段、１６：バックプレート（支持部材）、１７：給水部、１８：排水部、１９：Ｏリング、２０〜２２：導水溝、２３、２４：拡幅部、２５：通水孔、２６、２７：通水路、２８、２９：閉塞部材、３０、３１：導水部、３２：連結部、３３：連通部、３４、３５：導水溝、３６：短辺銅板、３７：通水孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous casting mold in which a supporting member is fixed to a back surface side of a mold body by an attaching means, and relates to a continuous casting mold having improved cooling efficiency of the mold body in the vicinity of the attaching means.
[0002]
[Prior art]
Conventionally, a continuous casting mold (hereinafter also simply referred to as a mold) 70 used in a continuous casting facility includes a pair of

narrow cooling members

71 and 72 as shown in FIG.

Long side members

73 and 74 which are a pair of wide cooling members arranged so as to sandwich the

members

71 and 72, bolts 75 are attached to both ends of the

long side members

73 and 74 facing each other, and a spring is interposed therebetween. The structure is fixed with a nut 76.
The

short side members

71 and 72 are mirror-symmetrical and have the same configuration, and as shown in FIGS. 7, 8A and 8B, a large number of water guide grooves 77 are provided in the vertical direction on the back side. The short-side copper plate 78 and a back plate 80 (also referred to as a cooling box or a water box) fixed to the back side of the short-side copper plate 78 with bolts 79 are provided. And the industrial water which is an example of a cooling water is poured into the water guide groove 77 through the drainage part 81 and the water supply part 82 which were each provided in the upper end part and lower end part of the backplate 80, and cooling of the short side copper plate 78 is carried out. Is going. On the other hand, the

long side members

73 and 74 have substantially the same configuration, but the width of the long side copper plate 81 of the

long side members

73 and 74 is longer than the width of the short side copper plate 78 of the

short side members

71 and 72. The width of the back plate 82 fixed to the back side of the long side copper plate 81 is longer than the width of the long side copper plate 81.
A mold body 83 is constituted by the short side copper plate 78 of the

short side members

71 and 72 and the long side copper plate 81 of the

long side members

73 and 74.
[0003]
During the continuous casting operation, molten steel is poured from above the continuous casting mold 70 (above the short-side copper plate 78 and the long-side copper plate 81), and an initial solidification of the cast slab to be a product is performed by the mold 70 and solidified. The slab is manufactured by continuously drawing from below the mold 70. Although the molten steel temperature poured into the mold 70 and the surface temperature of the slab at the outlet of the mold 70 differ depending on the operating conditions, the molten steel temperature is usually about 1500 ° C., and the surface temperature of the slab at the outlet of the mold 70 is 800 ˜1200 ° C. The inside of the slab here is in an unsolidified state, that is, in a liquid state.
As described above, the molten steel is at a high temperature, and if the short side copper plate 78 and the long side copper plate 81 are not sufficiently cooled, the temperature rises. Therefore, the strength of the copper does not decrease the temperature of the short side copper plate 78 and the long side copper plate 81. It is necessary to keep the temperature below a certain level.
[0004]
Therefore, in order to make the temperature of the short side copper plate 78 and the long side copper plate 81 sufficiently low and to have a uniform temperature distribution, cooling water provided on the back side of the short side copper plate 78 and the long side copper plate 81 is used. Various techniques have been proposed for adjusting the position of a number of water guide grooves 77 that pass therethrough.
For example, as described in Patent Document 1, the water guide groove between the bolts within the range of 100 mm or less from the vicinity of the meniscus portion of the short side copper plate and the long side copper plate is diverted to the bolt side so as to reduce the distance between them. In this way, a method for cooling the vicinity of the bolt, in which the cooling efficiency is lowered, is disclosed.
Moreover, as described in Patent Document 2, the cross-sectional shape of the water guide groove located at the end of the short side copper plate and the long side copper plate is inclined with respect to the thickness direction of the short side copper plate and the long side copper plate. In addition, a continuous casting mold is disclosed in which the cooling efficiency of the short-side copper plate and the long-side copper plate with reduced cooling efficiency is increased.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2-59144 (FIG. 1)
[Patent Document 2]
Japanese Utility Model Publication No. 61-36341 (FIG. 6)
[0006]
[Problems to be solved by the invention]
However, the above-described continuous casting mold has the following problems.
When the water guide groove between the bolts is detoured to the bolt side so that the distance between the bolts is reduced and the vicinity of the bolt is cooled, the cooling efficiency in the vicinity of the bolt is increased. However, by diverting the water guide groove to one side (bolt side) so that the distance between the adjacent water guide grooves between the upper and lower bolts is reduced, the distance between the water guide groove located on the other side and the bypass water guide groove is reduced. Opening and the cooling efficiency of this part will fall.
The cross-sectional shape of the water guide groove provided at the end of the short side copper plate and the long side copper plate is inclined with respect to the thickness direction of the short side copper plate and the long side copper plate, and the short side copper plate and the long side copper plate In the case where the cooling of the end portion is performed, the cooling efficiency of the end portion is improved as compared with the case where the water guide groove is not inclined. However, the cross-sectional shape of the water guide groove is an obliquely inclined shape, and it cannot properly cool the cooling surface side of the mold body and the portion where the cooling efficiency is reduced. The cooling efficiency of the part cannot be sufficiently increased to the required level.
[0007]
For this reason, in the cooling surface of the same height of the mold body, there is a part where the temperature rises more than other parts. For example, local wear occurs in the mold body, and there is a problem that the life of the mold is reduced. . In addition, temperature distribution varies on the cooling surface of the mold body at the same height, resulting in non-uniform cooling of the slab and a problem that the quality of the manufactured product is deteriorated.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a continuous casting mold that can improve the life of a mold body and can produce a cast piece having good quality.
[0008]
[Means for Solving the Problems]
The casting mold for continuous casting according to the first invention meeting the above object is made of a metal having good thermal conductivity, and has a mold body provided with a water flow portion on the back surface side, and attachment means on the back surface side of the mold body. A continuous casting mold that cools the mold body by flowing cooling water through the water supply section and the drainage section provided in the support member, and a fixed support member.
The water flow portion includes a large number of water guide grooves provided on one side of the back surface of the mold body, and each of the water guide grooves disposed across the attachment means is provided with a widened portion wider than the other water guide grooves. Forming a communicating part that connects the widened parts on the back side of the mold body,
Each of the widened portions is arranged in the depth direction , and is in contact with the inner surface on one side and the inner surface on the other side of each of the widened portions, thereby cooling the cooling surface side of the mold body and the attachment means side. It has a closing member that forms an L-shaped water guide portion, and a connecting portion that integrally connects each closing member at its side, and the cross-sectional shape of each closing member and the connecting portion is a U-shape. And attaching the connecting part to the communicating part to contact the support member,
The cross-sectional area of the water guide portion is set to be equal to or smaller than the cross-sectional area of the water guide groove other than the water guide portion, and the speed of the cooling water passing through the water guide portion is equal to the speed of the cooling water passing through the water guide groove other than the water guide portion. Alternatively, the cooling efficiency of the mold body in the vicinity of the attachment means is increased.
Thus, since the widened portion wider than the other water guide grooves is provided in the water guide groove in the vicinity of the attachment means, it is possible to cool the cooling surface side of the mold body and also cool the attachment means side.
Also, a blocking member is arranged in a part of the widened portion in the depth direction to provide a water guide, and the speed of the cooling water passing through this water guide is equal to the speed of the coolant passing through the water guide groove other than the water guide or Since the cooling efficiency of the mold body in the vicinity of the attachment means is increased, the temperature distribution at the same height position of the mold body can be made substantially uniform.
[0009]
Since the widened portion is provided in each of the water guide grooves arranged with the attachment means interposed therebetween, for example, the vicinity of the attachment means can be cooled without greatly diverting the water guide groove to the attachment means side.
Since the closing member disposed in each widened portion is integrally connected by the connecting portion, there is no need to individually dispose the closing member for each widened portion. In addition, since the connecting portion is arranged in the communicating portion formed on the back surface side of the mold body, the closing member can be attached to each widened portion reliably and easily without using, for example, a bolt.
[0010]
Since the cross-sectional shape of the water guide section is L-shaped and the cooling surface side and the attachment means side of the mold body are cooled, it is possible to appropriately cool the portion where the cooling efficiency is desired with a simple shape.
The continuous casting mold according to the second invention that meets the above-mentioned object is the continuous casting mold according to the first invention, wherein the widened portion is widened between mounting means adjacent in the vertical direction of the mold body. It has become.
As described above, since the widened portion is widened between the adjacent attaching means, for example, a portion where the cooling efficiency is desired to be increased can be appropriately cooled without newly providing a water guide groove.
The continuous casting mold according to a third aspect of the present invention that meets the above object is the continuous casting mold according to the first and second aspects, wherein the widened portion is provided at least in the meniscus portion.
As described above, since the widened portion is provided at least in the meniscus portion, it is possible to appropriately cool the portion having the highest temperature in the mold body.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory view of a short side copper plate of a mold body of a continuous casting mold according to an embodiment of the present invention, and FIGS. 2A and 2B are cross-sectional views taken along arrows aa in FIG. Fig. 3 is a cross-sectional view taken along arrows bb, Figs. 3A and 3B are cross-sectional views taken along arrows cc and dd in Fig. 1, and Fig. 4 is a short side used for numerical analysis. FIG. 5 is an explanatory diagram showing a cross-sectional shape of a meniscus portion of a copper plate, FIG. 5 is an explanatory diagram of a water channel model used for numerical analysis of cooling water flowing through a water guide groove of the short side copper plate, and FIGS. 6 (A) and 6 (B) are numerical values, respectively. It is explanatory drawing of the temperature distribution of the meniscus part of the short side copper plate based on an analysis result, and explanatory drawing of the temperature distribution based on the numerical analysis result of the meniscus part of the short side copper plate which concerns on a prior art example.
[0012]
As shown in FIGS. 1 to 3, a continuous casting mold (hereinafter simply referred to as a mold) 10 according to an embodiment of the present invention includes a pair of

narrow cooling members

11 and 12, which are a pair of narrow cooling members, It is manufactured by combining a long side member (not shown) which is a pair of wide cooling members (see FIG. 7).
[0013]
The short-

side members

11 and 12 of the continuous casting mold 10 are each made of copper, which is an example of a metal having good thermal conductivity, and a short-side copper plate 14 having a water passage portion 13 provided on the back side, and a short side. A back plate (also referred to as a cooling box or a water box) 16, which is an example of a support member fixed to the back surface side of the copper plate 14 by an attaching means 15, and a water supply part 17 and a drain part 18 provided on the back plate 16 are provided. The short side copper plate 14 is cooled by flowing industrial water, which is an example of cooling water, through the water passage 13. On the surface (cooling surface) of the short side copper plate 14, for example, a coating material such as Ni or Ni—Co alloy is plated or sprayed. The long-side member of the continuous casting mold 10 has substantially the same configuration as the short-

side members

11 and 12 described above, and includes the short-side copper plate 14 of the short-

side members

11 and 12 and the long-side copper plate of the long-side member. A mold body is configured, and a mold space is formed inside the mold body.
As described above, the long-side copper plate is different from the short-side copper plate (hereinafter, also simply referred to as a copper plate) 14 in width, and thus the description thereof is omitted. Hereinafter, only the short-side copper plate 14 will be described in detail.
[0014]
As shown in FIG. 1, FIG. 2 (A), (B), the copper plate 14 (for example, about 10-100 mm in thickness) is formed with the internal thread part (14 places in this Embodiment) currently formed in the copper plate 14. The back plate 16 made of, for example, stainless steel (for example, having a thickness of about 50 to 500 mm) is fixed by attachment means 15 comprising a male screw that is screwed into the female screw portion and fastens the back plate 16. A groove is formed in the peripheral portion of the back plate 16 surrounding the water supply portion 17, the drainage portion 18 of the back plate 16, and the water passage portion 13 of the copper plate 14, and an O-ring 19 is disposed here, thereby the copper plate 14. And the back plate 16 are improved in adhesion, and leakage of industrial water from the water passage 13 is prevented. Further, in order to attach the male screw, a seal washer that can be waterproofed is disposed in advance in the holes (12 positions in the present embodiment) formed in the back plate 16, and industrial water from the portion where the male screw is attached. Prevents leakage.
As a result, industrial water is supplied from a water supply port (not shown) provided in the water supply unit 17 below the back plate 16, and the water supply unit 17 makes the water flow unit 13 uniform in the width direction and below the copper plate 14. The industrial water that flows from the side to the upper side is discharged from a drain port (not shown) provided in the drain unit 18 on the upper side of the back plate 16 to cool the copper plate 14.
[0015]
As shown in FIGS. 1, 2 (A), (B), 3 (A), and (B), the water flow portion 13 includes a plurality of water guide grooves 20 to 22 provided on the entire back surface of the copper plate 14. I have. These water guide grooves 20 to 22 are substantially linear in the direction of water flow of the water flow section 13 and are formed at a predetermined pitch (for example, about 10 to 40 mm).
A plurality (five in the present embodiment) of water guide grooves 20 provided at the center of the copper plate 14 have substantially the same cross-sectional shape from the lower end to the upper end. A distance D1 from the groove bottom of the water guide groove 20 to the joint surface (back surface of the copper plate 14) between the copper plate 14 and the back plate 16 is, for example, about 1/3 to 2/3 of the thickness of the copper plate 14, and its width W1. Is, for example, about 1/10 to 1/2 of the distance D1.
[0016]
Further, the

water guide grooves

21 and 22 located in the vicinity of the attachment means 15, that is, at both ends in the width direction of the copper plate 14, and arranged with the attachment means 15 interposed therebetween are also the above-described water guide grooves 20 except for the part located in the meniscus portion. The shape is substantially the same.

Wide portions

23 and 24 are provided at portions of the

water guide grooves

21 and 22 located at the meniscus portion, respectively. The widened

portions

23 and 24 are widened between the attachment means 15 adjacent to each other in the vertical direction of the mold body, and the widths W2 and W3 are, for example, 1.. 5 to 5 times. The distances D2 and D3 from the bottoms of the

water guide grooves

21 and 22 to the back surface of the copper plate 14 are substantially the same as the distance D1 of the water guide groove 20 described above.
It is to be noted that the water guide grooves 22 arranged at both ends in the width direction of the copper plate 14, and further arranged outside the water guide grooves 22 and having a circular cross-section through holes 25 for cooling the O-ring 19, are connected to the water supply section 17. Industrial water is sent in through the communicating water passage 26, and the industrial water is discharged through the water passage 27 in communication with the drainage section 18.
[0017]

Closed members

28 and 29 made of, for example, a stainless steel plate or a copper plate, which are rust-resistant materials, are disposed in part of the widened

portions

23 and 24 in the depth direction. The closing member 28 has a thickness T1 that is, for example, 1/2 to 9/10 of a distance D2 from the bottom of the water guide groove 21 to the back surface of the copper plate 14, and a width W4 is equal to a width W2 of the widened portion 23. For example, it is 1/3 to 9/10. One end surface of the closing member 28 is in contact with the inner surface on one side of the widened portion 23, that is, the inner surface on the center side in the width direction of the copper plate 14.
Further, the closing member 29 has a thickness T2 that is, for example, 1/2 to 9/10 of a distance D3 from the bottom of the water guide groove 22 to the back surface of the copper plate 14, and a width W5 is a width W3 of the widened portion 24. For example, 1/3 to 9/10. The other end surface of the closing member 29 is in contact with the inner surface on the other side of the widened portion 24, that is, the inner surface on the end side in the width direction of the copper plate 14.
Here, since both end portions in the vertical direction of the closing

members

28 and 29 are each formed of a curved surface, the resistance to the flow of industrial water flowing from the

lower side members

11 and 12 to the upper side can be reduced.
[0018]
Thereby, since the cross-sectional shape of the

water conveyance parts

30 and 31 provided in the widening

parts

23 and 24 of each water conveyance groove |

channel

21 and 22 becomes substantially L shape, respectively, the cooling surface side of the copper plate 14, and the attachment means 15 The inside of the copper plate 14 on the side can be appropriately cooled.
Here, the distance D2 between the

widened portions

23 and 24 so that the cross-sectional area of each of the

water guide portions

30 and 31 is equal to or less than the cross-sectional area of the other portion of the water guide grooves 21 and 22 (portion other than the water guide portions 30 and 31). , D3 and widths W2 and W3, and thicknesses T1 and T2 and widths W4 and W5 of the closing

members

28 and 29, respectively. Thereby, since the speed of the industrial water which passes each

water guide part

30 and 31 can be made equal to or more than the speed of the industrial water which passes the

water guide grooves

21 and 22 other than the

water guide parts

30 and 31, the attachment means 15 vicinity The cooling efficiency of the copper plate 14 can be increased. Therefore, better cooling efficiency can be obtained by using industrial water having the same flow rate as before, which is economical.
[0019]
The closing

members

28 and 29 are integrally connected by a connecting portion 32 disposed therebetween, and the cross-sectional shapes of the closing

members

28 and 29 and the connecting portion 32 are substantially U-shaped.
The connecting portion 32 is integrally provided on the side portions of the closing

members

28 and 29 so as to be in contact with the back plate 16, and is formed on the back surface side of the copper plate 14 so that the widened

portions

23 and 24 are connected. It has a configuration that can be arranged in the connecting portion 33 to be connected.
Thereby, from the back surface side of the copper plate 14, the

respective closing members

28, 29 and the connecting portion 32 that are integrated are arranged in the respective widened

portions

23, 24 and the communication portion 33, and the back plate 16 is placed on the back surface of the copper plate 14. By attaching and fixing, each of the closing

members

28 and 29 and the connecting portion 32 can be securely fixed at a target place.
[0020]
(Numerical analysis)
Next, the results of fluid analysis (FEM analysis) using the short-side copper plate 14 of the continuous casting mold 10 described above will be described.
As shown in FIG. 4, the dimensions of the short side copper plate 14 used for the fluid analysis are as follows: the thickness of the short side copper plate 14 is 45 mm, the width W1 of the water guide groove 20 is 5 mm, and the width W2 of the water guide portion 30 of the water guide groove 21. 15 mm, the width W3 of the water guide portion 31 of the water guide groove 22 is 10 mm, the distance D1 of the water guide groove 20 is 23 mm, the {(distance D2)-(thickness T1)} of the water guide portion 30 is 5 mm, and the {(distance D3) of the water guide portion 31 )-(Thickness T2)} is 7 mm, {(width W2)-(width W4)} of the water guide portion 30 is 4 mm, and {(width W3)-(width W5)} of the water guide portion 31 is 5 mm. The diameter of the water passage hole 25 is 10 mm. The physical properties of the cooling water are assumed to be 30 ° C., a density of 995.7 kg / mm ³ , and a viscosity of 8.00 × 10 ⁻⁴ Pa · s.
Here, the number of each of the water guide grooves 20 to 22 of the copper plate 14 and each water guide groove when 575 (L / min) of cooling water flows per surface with a pressure of ΔP = 1.29 (kg / cm ² ). Table 1 shows the flow rates and flow rates of 20 to 22 and the water passage holes 25.
[0021]
[Table 1]

[0022]
At this time, the cooling water flowing from the water supply unit 17 to the drainage unit 18 through the

water guide grooves

21 and 22 has a flow as shown in FIG.
As a result of conducting heat transfer analysis using the water guide grooves 20 to 22 having the above-described shape, the temperature of the groove bottom of the water guide groove 20 is 128 ° C. as shown in FIG. The temperature at the bottom of each of the

water guide grooves

21 and 22 near the attachment means 15 is also 133 ° C. Thus, the temperature of the groove bottom of each water guide groove 20-22 exists in the temperature range of 128-133 degreeC. The temperature of the water passage hole 25 on the surface side of the copper plate 14 is 131 ° C. Thereby, for example, the boiling point temperature of water is lower than 133 ° C. when the cooling water back pressure is 0.2 (MPa), and it becomes possible to suppress the promotion of scale adhesion.
At this time, the temperature distribution on the cooling surface side of the copper plate 14 is distributed in the temperature range of 306 to 310 ° C. excluding the temperature 321 ° C. at the end in the width direction, and it can be seen that a substantially uniform temperature distribution can be obtained. .
[0023]
On the other hand, as in the prior art, the

water guide grooves

34 and 35 having no widened portion (only the groove bottom of the water guide groove 35 in the vicinity of the attaching means protrudes to the cooling surface side of the short side copper plate 36 from the groove bottom of the other water guide grooves 34. 6 (B), the temperature of the groove bottom of each of the

water guide grooves

34 and 35 is 120 to 142 ° C., for example, the cooling water back pressure is set at 0. 0. The boiling point temperature of water at 2 (MPa) is higher than 133 ° C., and scale adhesion is promoted. The temperature of the water passage hole 37 on the surface side of the copper plate 36 was 141 ° C.
At this time, the temperature distribution on the cooling surface side of the copper plate 36 also varies in the temperature range of 311 to 325 ° C. in the width direction of the short side copper plate 36 except for the temperature 337 ° C. at the end in the width direction.
From the above, by using the continuous casting mold 10, it is possible to improve the life of the mold body and to manufacture a slab having good quality.
[0024]
As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. Other embodiments and modifications conceivable within the scope of the above are also included. For example, the case where the continuous casting mold of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
In the above-described embodiment, the case where copper is used as a metal having good thermal conductivity has been described. However, if the thermal conductivity is good, other metals, copper alloys, and the like can be used, for example. .
Moreover, in the said embodiment, the widening part was each provided in the water guide groove arrange | positioned on both sides of an attachment means .
[0025]
And in the said embodiment, although the case where the widening part was provided in the meniscus part was demonstrated, if the widening part is provided in the meniscus part at least, it will provide from the downward direction to the upper part of the water guide groove near attachment means. It is also possible. At this time, the temperature of the mold body tends to gradually increase from the lower side of the mold body to the meniscus portion, so the width of the water guide groove is reduced from the lower side of the mold body to the meniscus portion in consideration of this temperature distribution. It can also be gradually widened.
Furthermore, in the said embodiment, the case where the bottom of each water guide groove was made into the substantially the same position with respect to the thickness direction of a casting_mold | template main body was demonstrated. However, in order to increase the cooling efficiency of the slab by the mold body, it is possible to change the depth for each water guide groove, or to make the depth of each water guide groove partially deeper or shallower. .
[0026]
【The invention's effect】
In the continuous casting mold according to any one of claims 1 to 3, since a widened portion wider than the other water guide grooves is provided in the water guide groove in the vicinity of the attachment means, the cooling surface side of the mold body is cooled, and the attachment means side is also provided. Cooling can also be performed. As a result, on the cooling surface of the same height of the mold body, the temperature rise of the mold body in the vicinity of the mounting means, where the temperature has risen more than other parts, can be suppressed and further prevented. Can be improved.
Also, a blocking member is arranged in a part of the widened portion in the depth direction to provide a water guide, and the speed of the cooling water passing through this water guide is equal to the speed of the coolant passing through the water guide groove other than the water guide or Since the cooling efficiency of the mold body in the vicinity of the attachment means is increased, the temperature distribution at the same height position of the mold body can be made substantially uniform. Thereby, cooling of a slab can be performed substantially uniformly and the slab provided with favorable quality can be manufactured.
[0027]
In particular, in the continuous casting mold according to claim 1 , since the widened portion is provided in each of the water guide grooves arranged with the attachment means interposed therebetween, for example, the attachment of the water guide groove without largely detouring to the attachment means side. The vicinity of the means can be cooled. Thereby, since the cooling water which passes a water guide groove | channel also flows stably, the part with the worst cooling efficiency in a casting_mold | template main body can be cooled appropriately.
In the casting mold for continuous casting according to claim 1, since the closing members respectively disposed in the respective widened portions are integrally connected by the connecting portions, it is necessary to individually arrange the closing members for the respective widened portions. There is no sex. In addition, since the connecting portion is arranged in the communicating portion formed on the back surface side of the mold body, the closing member can be attached to each widened portion reliably and easily without using, for example, a bolt. Thereby, the structure of the casting mold for continuous casting can be simplified, and the workability at the time of manufacturing the casting mold for continuous casting is improved.
[0028]
In the continuous casting mold according to claim 1 , the cooling section side of the mold body and the inside of the mold body on the attachment means side are cooled by making the cross-sectional shape of the water guide portion L-shaped, so that the cooling efficiency is simple and has a cooling efficiency. It is possible to appropriately cool the portion where it is desired to increase the temperature. Thereby, the slab provided with still better quality can be manufactured.
In the continuous casting mold according to claim 2 , since the widened portion is widened between adjacent mounting means, for example, cooling of a portion where cooling efficiency is desired to be increased without newly providing a water guide groove. Can be done appropriately. Thereby, since the shape of the water guide groove can be simplified, the manufacturing operation of the mold body is facilitated.
In the continuous casting mold according to the third aspect , since the widened portion is provided at least in the meniscus portion, it is possible to appropriately cool the portion having the highest temperature in the mold body. Thereby, the lifetime of the casting mold for continuous casting can be improved, which is economical.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a short-side copper plate of a mold body of a continuous casting mold according to an embodiment of the present invention.
2A and 2B are cross-sectional views taken along arrows aa and bb, respectively, in FIG.
3A and 3B are a cross-sectional view taken along a line cc and a cross-sectional view taken along a line dd in FIG. 1, respectively.
FIG. 4 is an explanatory diagram showing a cross-sectional shape of a meniscus portion of a short-side copper plate used for numerical analysis.
FIG. 5 is an explanatory diagram of a water channel model used for numerical analysis of cooling water flowing through a water guide groove of the short side copper plate.
FIGS. 6A and 6B are explanatory diagrams of the temperature distribution of the meniscus portion of the short side copper plate based on the numerical analysis results, respectively, and the temperature distribution based on the numerical analysis result of the meniscus portion of the short side copper plate according to the conventional example. It is explanatory drawing of.
FIG. 7 is a plan view of a continuous casting mold.
8A is an explanatory diagram of a short-side copper plate according to a conventional example, and FIG. 8B is a cross-sectional view taken along the line ee of FIG.
[Explanation of symbols]
10: casting mold for continuous casting, 11, 12: short-side member, 13: water-passing portion, 14: short-side copper plate, 15: attachment means, 16: back plate (supporting member), 17: water supply portion, 18: drainage portion , 19: O-ring, 20-22: Water guide groove, 23, 24: Widened portion, 25: Water passage hole, 26, 27: Water passage, 28, 29: Closure member, 30, 31: Water guide portion, 32: Connection Part, 33: communication part, 34, 35: water guide groove, 36: short side copper plate, 37: water hole

Claims

熱伝導性が良好な金属からなり、裏面側に通水部が設けられた鋳型本体と、該鋳型本体の裏面側に取付け手段によって固定された支持部材とを有し、該支持部材に設けられた給水部及び排水部を介して前記通水部に冷却水を流すことで前記鋳型本体の冷却を行う連続鋳造用鋳型において、
前記通水部は前記鋳型本体の裏面側一面に設けられた多数の導水溝を備え、前記取付け手段を挟んで配置される導水溝に他の導水溝より幅広の拡幅部をそれぞれ設け、しかも前記鋳型本体の裏面側に前記各拡幅部を繋げる連通部を形成し、
前記各拡幅部の深さ方向にそれぞれ配置され、しかも該各拡幅部の一方側の内面と他方側の内面にそれぞれ当接して、前記鋳型本体の冷却面側及び前記取付け手段側の冷却を行う断面Ｌ字状の導水部を形成する閉塞部材と、該各閉塞部材をその側部で一体的に接続する連結部を有し、更に前記各閉塞部材と前記連結部の断面形状をコ字状とし、該連結部を前記連通部に取付けて前記支持部材に当接させ、
前記導水部の断面積を該導水部以外の導水溝の断面積以下にして、前記導水部を通過する前記冷却水の速度を前記導水部以外の導水溝を通過する前記冷却水の速度と同等又はそれ以上にし、前記取付け手段近傍の前記鋳型本体の冷却効率を高めることを特徴とする連続鋳造用鋳型。The mold body is made of a metal having good thermal conductivity and has a water passage on the back surface side, and a support member fixed to the back surface side of the mold body by attachment means. In the continuous casting mold for cooling the mold body by flowing cooling water through the water supply section and the drainage section to the water flow section,
The water flow portion includes a large number of water guide grooves provided on one side of the back surface of the mold body, and each of the water guide grooves disposed across the attachment means is provided with a widened portion wider than the other water guide grooves. Forming a communicating part that connects the widened parts on the back side of the mold body,
Each of the widened portions is arranged in the depth direction , and is in contact with the inner surface on one side and the inner surface on the other side of each of the widened portions, thereby cooling the cooling surface side of the mold body and the attachment means side. It has a closing member that forms an L-shaped water guide portion, and a connecting portion that integrally connects each closing member at its side, and the cross-sectional shape of each closing member and the connecting portion is a U-shape. And attaching the connecting part to the communicating part to contact the support member,
The cross-sectional area of the water guide portion is set to be equal to or smaller than the cross-sectional area of the water guide groove other than the water guide portion, and the speed of the cooling water passing through the water guide portion is equal to the speed of the cooling water passing through the water guide groove other than the water guide portion. The casting mold for continuous casting characterized in that the cooling efficiency of the mold main body in the vicinity of the attaching means is increased.

請求項１記載の連続鋳造用鋳型において、前記拡幅部は前記鋳型本体の上下方向に隣り合う取付け手段の間に向かって幅広となっていることを特徴とする連続鋳造用鋳型。2. The continuous casting mold according to claim 1 , wherein the widened portion is widened between mounting means adjacent in the vertical direction of the mold body.

請求項１及び２のいずれか１項に記載の連続鋳造用鋳型において、前記拡幅部は少なくともメニスカス部に設けられていることを特徴とする連続鋳造用鋳型。 3. The continuous casting mold according to claim 1, wherein the widened portion is provided at least in the meniscus portion. 4.