Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2909
標題: 菱變鋼胚產出原因之探討與煉鋼製程改良之對策
Factors Resulting in Shape Defect of Steel Billets and Strategies for Improvement on Processing Control
作者: 史智文
shih, chih-wen
關鍵字: 菱變;rhomboidity;脫方;連續鑄造;一次冷卻區;二次冷卻區;off-square;continuous casting;first cooling zone;secondary cooling zone
出版社: 機械工程學系所
引用: 參考文獻 [1]何宇明,徐韋強,袁廠英,“連鑄方胚脫方控制的實踐”,重鋼技術,第52卷第3期,2009年9月. [2]巨建濤,張朝暉,楊軍,付福旗,“連鑄方胚脫方和角裂原因分析”,鑄造技術,第28卷第9期,2007年9月. [3]李長茂,姚曼,蘇云剛,方大成,唐立穎,胡成,王志道,“小方胚連鑄結晶器溫度檢測及作用”,連鑄控制與檢測期刊,第1期,2001. [4]董金武,聞興田,楊澤荣,劉凌奎,“普碳鋼小方胚脫方原因分析及措施”,濟鋼第二煉鋼廠鑄胚質量期刊,第5期,2002. [5]祁建軍,成永久,李中原,宋江波,“小方胚脫方的工藝探討”,包鋼科技,第29卷增刊,2003年12月. [6]王曉靜,關紅兵,孟民眾,程官江,張振申,“安鋼小方胚脫方成因分析與防止措施”,安陽鋼鐵集團,第4期,2002. [7]楊大海,“羅克普方胚連鑄機拉速提高後的脫方控制”,崇利制鋼,第2期,2001. [8]楊利東,孫強,陳利平,戴紅娟,“結晶器銅管在使用中存在的問題及分析” ,河南江河結晶器公司,第3期,2005. [9]牛新輝,孫宗輝,朱延強,安軍生,“提高結晶器銅管使用壽命的措施”,濟南鋼鐵,第5期,2004. [10]S.Kumar,J.A.Meech,I.V.Samarasekera,J.K.Brimacombe,and V.Ra- kocevic,“Development of intelligent mould for online detect-ion of defects in steel billets”,Ironmaking&Steelmaking,Vol.26,No.4,pp.269-272,1999 [11] LIU Wen-hong ,XIE Zhi,“Design and simulation test of adv-anced secondary cooling control system of continuous casting based on fuzzy self-adaptive PID”,JOURNAL OF IRON AND STEEL R-ESEARCH,INTERNATIONAL,VOL.18(1),pp.6-30,2011 [12] ZHONG Liang-cai,WANG Ming-an,CHEN Bo-yu,WANG Can-rong,ZHU Ying-xiong, “Flow control in six-strand billet continuous ca-sting tundish with different configurations”, JOURNAL OF IRO-N AND STEEL RESEARCH,INTERNATIONAL,VOL.17(7),pp.7-12,2010
摘要: 
菱變也稱為脫方,如果程度嚴重的話,鋼胚內部將產生對角裂,或在轉角處有裂縫並伴隨著凹陷,菱變鋼胚會造成加熱爐內之推鋼不便及軋鋼時咬入困難,因此降低菱變的發生率是提高產能的重要課題。此研究,首先探討鋼液成份[C]、[S]、[Mn]對菱變缺陷所造成的影響,再經由改善煉鋼製程及修改成份,將菱變之缺陷剔除。接著利用正交試驗,找出影響菱變最大之製程因素為澆鑄速度,再針對該製程條件進行統計分析。最後考慮連鑄機的設備因素所造成之影響,在一次冷卻區中進行新舊銅管之溫度量測試驗,以探討因銅管磨耗所造成之拔熱不均對菱變的影響程度;當排除一次冷卻區之因素後,但仍產生菱變胚,在二次冷卻區中於銅管修整時,檢測銅管之下部及相對應之足部輥輪之磨損情形,以確定是否變形或對弧校正不當,同時檢查二次冷卻噴水之流量及壓力是否設定不當,導致冷卻不均,進而產生菱變。

Rhomboidity is also called off-square. If it is serious, the billet will have diagonal crack in the interior, or crack in the corner accompanying with concave surface. Also, it would cause inconvenience in pushing billet in heating furnace and result in difficulty on biting billet between rollers. Thus reducing rhomboidity of billet is an important subject for increasing production. In this work, firstly, the effect of composition of [C] 、 [S] and [Mn] in molten steel on rhomboidity was investigated the composition and improving steel-making process, the defect was removed. Then using the orthogonal test, it was found that the most important factor on rhomboidity is casting speed, The acquired data that analyzed based on statistics. Secondly, the influence induced by continuous casting machine was considered. In the first cooling zone, the temperatures of old and new copper tubes were measured. In doing so, uneven heat removing due to worn copper tubes can be investigated. After excluding the factors in the fist cooling zone, but still have rhomboidity problem, in the secondary cooling zone an inspection of wearing at the bottom of the copper tubes and the foot roller is required. This can determine whether there is a deformation or and improper calibration of the arc. The flowrate of spray nozzle of secondary cooling water and its pressure also need to be checked .Since they might cause uneven cooling and eventually result in rhomboidity of billet.
URI: http://hdl.handle.net/11455/2909
其他識別: U0005-0507201221135000
Appears in Collections:機械工程學系所

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