CN1043317C - 生产半成品的方法和装置 - Google Patents

生产半成品的方法和装置 Download PDF

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CN1043317C
CN1043317C CN94192379A CN94192379A CN1043317C CN 1043317 C CN1043317 C CN 1043317C CN 94192379 A CN94192379 A CN 94192379A CN 94192379 A CN94192379 A CN 94192379A CN 1043317 C CN1043317 C CN 1043317C
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弗里茨·P·普莱斯奇乌特施尼格
迪特尔·斯托艾肯
米歇尔·冯德班克
英戈·V·哈根
洛撒·帕沙特
塔雷克·E·甘默尔
彼得·L·哈梅彻
乌尔里克·门内
尤威·施米德特
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36Elongated material
    • C23C2/40Plates; Strips
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003Apparatus
    • C23C2/0035Means for continuously moving substrate through, into or out of the bath
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003Apparatus
    • C23C2/0036Crucibles
    • C23C2/00361Crucibles characterised by structures including means for immersing or extracting the substrate through confining wall area
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003Apparatus
    • C23C2/0038Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/4998Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982Coating
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/51Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5184Casting and working

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Abstract

本发明涉及一种生产薄金属带形式半成品的方法和实施这种方法的一种装置。为了能确保所要求的不超过2%的带厚偏差,建议在生产这种宽厚比在60以上并厚度偏差小于2%的半成品过程中,当结晶层平均温度满足一定关系时,使钢带导出熔池之后再进行精轧。对此在室(5)中距熔液(3)平面0.5-5m处设有一精整辊子机(4),而精整辊子机(4)到熔池液面距离又为可变的。

Description

生产半成品的方法和装置
本发明涉及一种生产薄金属带形式的半成品的方法和实施这种方法的一种装置。
EP0331602B1号专利公开了生产薄金属带的一种方法和一种装置。其中,一个厚度为0.1-1.4mm且表面被清洗的金属型材,例如带状薄金属片(母带),连续通过充满同种类钢熔体的熔池的底板,其熔池的底板上设有一狭缝状开口,该开口带有一密封装置以阻止熔体流出。熔体温度接近液相线温度TLiq。钢带以一个恒定速度穿过熔体并从熔体中向上导出。由于钢带的热容量低(带温几乎同室温相同),在其表面形成一由结晶体和还能流动的熔体组成的附着层,该层的厚度可为原始母带厚度的数倍,它尤其取决于在熔体中停留的时间(母带的速度)、熔融温度(和固相线温度TSOL之差)、熔融潜热、所用材料的比热以及母带厚度。该方法的实施应避免附着的结晶重新熔融。在这种条件下,带厚方向上产生一个温度梯度,在母带通过熔池期间,其内部温度最低,并逐渐向边缘升高。在附着层内部也存在同样的温度分布。在附着层的最外部区域恰巧为液相线温度TLiq
最初附着层具有所形成的结晶体和介于二者之间的流态熔体(糊状区)的混合组成。流态熔体相的含量向外逐渐增加。离开熔池之后,附着层被冷却,此时的温度落差与厚有的正好反向,因而就出现了附着层的完全凝固。
从EP0311602B1中还可得知,用上述方法生产的半成品在离开熔池之后保存在防止氧化的保护气体中,直到它被冷却或进入变形设备中,在变形设备中,半成品将经历一个热或冷变形过程。其中所生产出的成品的一部分作为母带重新从本方法的开头内容开始并再次通过熔池。
就生产钢带材料而言,这种方法的实际使用到目前为止还存在一个重大障碍。另外,优质冷轧带或热轧带的使用方要求生产方确保带厚的波动在一定范围内,其最大波动为额定厚度的2%。目前使用的方法还不能确保遵守这么小的偏差。离开熔池后存在的超过所述的最大波动极限的带厚不规则性在以后的变形工艺中实际上不能被去除,这是因为辊轧中使用的半成品(宽厚比至少为60)的扁平率过大,使(减厚)变形实际上只在长度方向上进行,而其厚度不会回到额定值的范围内。沿横交于带长度方向(相对而言)直线上的厚度差无法改变。
EP0311602B1中给出了第二种方法,其母带相反从上方导入并穿过熔池底板再导出。在此实施例中,底板的密封问题尤为严重,因为熔体流出方向和母带导出方向一致,所以不仅缺乏有效的密封作用,甚至存在不利的促进流体流出的带出作用。由于这一原因,在熔池底板部设有一密封辊子对形式的特别的密封装置,该密封辊子对糊状区进行强烈的压缩,使得从已形成的海绵状结晶组织中挤出大部分液态物。其结果是,所得到的附着层的厚度相对于第一种方法显著减小。单从经济性考虑,这种方法仍不适合于实际使用。
本发明的目的是,进一步完善这种方法,以确保带厚的最大偏差在所要求的2%以内,并提供一种实施该方法的装置。
根据本发明,为实现上述目的提供一种生产薄金属带,特别是钢带的方法,薄金属带厚度小于20mm,其中低热焓的、未经冷却且被表面净化的金属型材自下而上连续通过同类材料的熔池,带速与熔池面高度有关,其调整应使通过金属截形上的结晶和熔液产生一个带厚,该厚度至少应为原始带厚的三倍,在生产该金属带过程中应将其保持在一个惰性气体中,其特征在于:为了生产这种宽厚比大于60并带厚波动小于2%的半成品,金属带离开熔池之后应进行精轧,这应在金属带结晶层的平均温度满足下述关系的条件下:
Tgl=TSOL+a×(TLiq-TSOL)
式中:a在0.1-0.8之间,
TSOL为固相线温度,
TLiq为液相线温度。
因子a在0.2-0.4之间。通过精轧厚度的减少应在5-15%之间。在生产所述钢带时对其通过熔池速度进行调整,使所得钢带厚度为原始带厚的3-7倍。进行精轧前的金属带的冷却通过熔池和导出金属带***室壁温度的影响来控制进入到精轧道次的金属带的冷却。按自然冷却的延缓来进行控制。按自然冷却的加速来进行控制。精轧之后对金属带进行一个受控的冷却。
根据本发明,为实现上述发明目的还提供一种用于实施上述方法的装置,它具有一个熔池,在其底部设有一用于导进金属型材的开口,开口还包含一阻止熔体流出的密封装置,另外还有一能使金属型材连续通过的传送装置和一个室,所述的室包住金属型材从熔体导出后的区域和与之相连的金属带冷却区,并且该室可充满惰性气体,其特征在于:在室中距熔池面0.5-5m处设有一精整辊子机,且该辊子机到熔池面的距离可调。
所述的成狭缝状开口,用于导入宽厚比至少为60的带状金属条,精整辊子机为并列邻近的精整辊子对。精整辊子机的高度位置可电动或液压调整。室在精整辊子机的高度调整区至少局部设有绝热壁。室至少在部分区域有流体冷却的冷却壁。在精整辊子机高度调整区至少设有一个测量金属带表面温度的装置。
下面参照图中示意的适合本发明方法的装置的实施例对本发明进行更详细的解释。
装上一带卷盘作为母带,并以一确定的速度展开。标号11是一个焊接带装置,用于连接已展开的卷盘末端和一个新的卷盘,使之能达到连续传送。标号7为一带存储机构,它能抵挡换卷盘时焊接过程中出现的短时间的送料中断,以使生产运行不被中断。生产流程中带存储装置7后面设有带清洗装置6,使母带的表面为纯金属组成。传送辊对2用于将母带以一稳定的预先选好的速度通过熔池1底板上相应的狭缝状开口进入熔体3中,该母带宽厚比至少为60,最好至少为100,母带的热焓很小,因为它的温度例如为室温,熔体3(如钢)由与母带相同的材料组成。置于熔池1底板上的一密封装置图中未单独示出。在母带自下而上通过熔体期间,结晶出一随停留时间(即接触熔池面时间)的增加而加厚的层。因为母带从所接触的周围熔体3中吸收热量、使它得以加热。此外,熔体3的温度比液相线温度高例如10K。熔池面高度通过一种未图示的方式保持在一稳定值。参照此及其它参数,特别是熔体材料的固相温度、熔融潜热、比热,最好这样来确定钢带通过传送轮2的速度,即使带粘附层的母带在离开熔体3时的厚度为原始母带厚度的3-7倍。
在熔池面上方设有一相互并排设置的精整辊对4形式的精整辊装置。该精整辊对与熔池面间距离可通过下面的方式调节,即利用机电式或液压式调节装置按箭头所示调节精整辊子对4的高度。精整辊子对4到池面最小距离为0.5m;最大距离为5m。高度位置的选择应在这样一个位置实现精轧,即在该处母带上粘附层一方面已较大程度凝固,另一方面在其外部区域仍有相当数量的流态物,使横过母带长度方向的物料流动成为可能,这也取决于固体和流态物之间尽可能有利的数量比,在此,控制参数为结晶层中的平均温度。按本发明精轧在TgL温度进行,它符合下述关系:
TgL=TSOL+Q(TLIq-TSOL)
其中a为一个因子,其值域在0.1-0.8之间、最好在0.2-0.4之间。a越小,凝固体含量就越多。下限被认为是不利的,因为在干扰情况下很容易产生完全或近似完全的凝固,使已有的较大厚度差异不可能消除。a的上限首要受其经济性制约。熔体相含量较高时,由于带材的垂直牵引,其大部被向下挤出,使得产量相应降低。为使调整简化,可在精整辊子对4的调节区内设一带表面温度测量装置(未示出)。精整辊子对按照目的采用内部液体冷却(水冷)。通过精轧所产生的金属带厚度下降应在5-15%之间。
为避免对所生产的半成品的后序再加工将产生干扰的钢带表面氧化,可使母带的粘附层通过一个充满惰性气体的室5,用以防止和氧气接触。室5直接和熔池1连接并包容辊子对4。为了避免粘附层产生不希望的快速冷却并由此避免过度凝固,必要时在室5侧壁的至少一部分尤其是在精整辊子对4的调节区装有绝热材料。此外,室5壁适宜采用冷却壁,特别是采用内部液体冷却壁(水冷)。通过控制冷却液温度使生产的半成品的精整辊装置4后面连接的冷却区8内实现一可控的冷却,这能导致获得所希望的材料性能。带状材料在冷却区8中间段与定额退火相似通过相应的转向轮形成弯道,使得在该区内形成一较长的停留时间。生产的金属带得到充分的冷却之后就离开惰性气体室5,由一静电上油装置9上油,以防止腐蚀。随后带状材料就由一卷盘13连续卷起。卷盘13达到一确定的重量之后就由一剪切机10将它与其余带分开并运送到冷热轧钢厂进行再加工。
也可如EP0311602B1中所述,直接就进行再加工。在这种情况下,为节省热能可在远高于室温就终止冷却,而带惰性气体的室(室5)延伸至与之相连的变形机。
借助下面的实施例(已在图中示意出其设备图),对本发明做进一步说明。
由X60钢形成的冷轧钢带中含有:
0.16%C,
0.35%Si,
1.3%Mn,
0.013%P,
0.003%S,
0.041%Al,
0.025%Nb,
0.0092%N,
其余为铁和一般杂质。
在钢带厚为0.5mm、宽为1000mm。在酸洗池6中脱油之后,由一驱动辊子对2垂直引入充满液态钢的熔池1的底板并进入熔池。熔体有和钢带相同的成份。来自分配器的钢熔体被连续注入熔池1。熔体3的高度和钢带速度为控制参数,用于调整钢带和熔池3所要求的接触时间,此处的接触时间为2秒。因为速度是1m/s。所以熔池深度始终保持2m。在温度约为1512℃的熔体3中,钢带通过时形成一厚度约为2.5mm的结晶层,因此离开钢液3时钢带的总厚经约为3mm。此时的钢带具有更粘稠的表面,按照公式:
T=TSOL+a×(TLiq-TSOL)(此处a=0.5),其结晶层内的平均温度为
T=1497℃+0.5×(1507℃-1497℃)=1502℃,它被送入设在充满氩气的和可控制冷却的室5内的可垂直移动的精整辊子机4内,在那里其最大厚度降低约15%(0.5mm)其表面粗糙度也被大大降低。对于上述情况,为实施本发明的精轧而必要的1502℃的温度特别有利于达到预期目标。接下来调整精整辊子机的垂直位置,以使在此时的冷却条件下精整辊子机内入料口处达到上述温度。通过精轧可获得完全无缺陷的和各分层熔接极好的且具有约2.5mm相同厚度的钢带。实际带厚和预定带厚的偏差为1.5%,明显小于将进一步冷加工的热轧带所允许的最大值2%。从精整辊子机导出之后,钢带继续通过氩气防止氧化,并在室5的水冷腔中进行受控的冷却。并且经过同样被冷却和充满氩气的缓冲腔(冷却区8)而导入卷盘台13。紧接着将钢带送进一个冷轧机(未示出)将其重新轧成0.5mm厚。这样制得的冷轧带具有优异的机械-工艺特性并能满足各种质量要求。连续生产的大约20%的产品作为输入材料将重新经历该过程。
利用本发明可通过格外简单的方式生产带状金属条,其形状和表面公差方面精度都很高(贯穿整个长度的外形和厚度偏差低于2%)。同时本方法还保证粘附层和母带之间的熔接非常安全。通过控制冷却可使带材获得优异的材料性能。

Claims (14)

1.一种生产薄金属带,特别是钢带的方法,薄金属带厚度小于20mm,其中低热焓的、未经冷却且被表面净化的金属型材自下而上连续通过同类材料的熔池,带速与熔池面高度有关,其调整应使通过金属截面上的结晶和熔液产生一个带厚,该厚度至少应为原始带厚的三倍,在生产该金属带过程中应将其保持在一个惰性气体中,其特征在于:为了生产这种宽厚比大于60并带厚波动小丁2%的半成品,金属带离开熔池之后应进行精轧,这应在金属带结晶层的平均温度满足下述关系的条件下:
Tgl=TSOL+a×(TLiq-TSOL)式中:a在0.1-0.8之间,
TSOL为固相线温度,
TLiq为液相线温度。
2.按照权利要求1所述的方法,其特征是,因子a在0.2-0.4之间。
3.按照权利要求1或2所述的方法,其特征在于:通过精轧厚度的减少应在5-15%之间。
4.按照权利要求1到3中任一项所述的方法,其特征在于:在生产所述钢带时对其通过熔池速度进行调整,使所得钢带厚度为原始带厚的3-7倍。
5.按照权利要求1到4中任一项所述的方法,其特征在于:进行精轧前的金属带的冷却通过熔池和导出金属带***室壁温度的影响来控制进入到精轧道次的金属带的冷却。
6.按照权利要求5所述的方法,其特征在于:按自然冷却的延缓来进行控制。
7.按照权利要求5所述的方法,其特征在于:按自然冷却的加速来进行控制。
8.按照权利要求1到7中任一项所述的方法,其特征在于:精轧之后对金属带进行一个受控的冷却。
9.特别是用于实施按权利要求1方法的装置,它具有一个熔池(1),在其底部设有一用于导进金属型材的开口,开口还包含一阻止熔体流出的密封装置,另外还有一能使金属型材连续通过的传送装置(2)和一个室(5),所述的室(5)包住金属型材从熔体(3)导出后的区域和与之相连的金属带冷却区(8),并且该室可充满隋性气体,其特征在于:在室(5)中距熔池面0.5-5m处设有一精整辊子机(4),且该辊子机(4)到熔池面的距离可调。
10.按照权利要求9所述的装置,其特征在于:所述的成狭缝状开口,用于导入宽厚比至少为60的带状金属条,精整辊子机(4)为并列邻近的精整辊子对。
11.按照权利要求9至10之任一项所述的装置,其特征在于:精整辊子机(4)的高度位置可电动或液压调整。
12.按照权利要求9至11之任一项所述的装置,其特征在于:室(5)在精整辊子机(4)的高度调整区至少局部设有绝热壁。
13.按照权利要求9至12之任一项所述的装置,其特征在于:室(5)至少在部分区域有流体冷却的冷却壁。
14.按照权利要求9至13之任一项所述装置,其特征在于:在精整辊子机(4)高度调整区至少设有一个测量金属带表面温度的装置。
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