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为控制薄带双辊连铸结晶器内金属液面的波动,提出了水口电磁制动(N-EMBr)设想,通过在水口区域施加稳恒磁场与直流电流,减缓水口金属液对双辊熔池的冲击文中对熔池液面的波动情况进行了实验模拟;观测了有无电磁制动及不同水口浸入深度等条件下熔池液面的波动情况,并测量了水口金属液冲击力的相对变化。结果显示,随输入电流增大,水口出量减小,双辊结晶器内液面波动幅度和频率降低,熔池液面趋于平稳,这表明水口电磁制动可望有效抑制熔池液面波动,为解决薄带双辊连铸结晶器内金属液的布流和流动控制问题,提供一种可选择的方法。 相似文献
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利用ANSYS有限元模拟软件,针对一常见工况建立了双辊薄带连铸熔池流场的三维模型,并对熔池的液面波动情况进行了瞬态模拟。得出了液面与辊面接触线上各点平均波动高度关于点位置变化图及熔池端部区域点波动高度随时间的变化图,并针对图中数值及趋势进行了分析。 相似文献
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采用楔形布流器,把整个双辊薄带铸轧熔池处理成钢液和空气的自由表面两相流,建立了熔池内钢液凝固传热的三维流热耦合仿真模型,进而对布流器侧水口倾角对熔池内钢液的凝固及温度分布的影响进行了研究。结果表明,当楔形布流器的侧水口倾角为0°时,熔池内钢液的凝固结束点(kiss点)高度适中,此时,双辊对薄带坯的轧制力也比较适宜,铸带宽度方向上温差较小,可有效地减少或避免薄带出现横裂纹和纵裂纹,获得较好的铸带质量。研究结果对双辊薄带连铸布流器水口倾角的设计提供了理论依据。 相似文献
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把双辊铸轧熔池看做钢液和大气的两相自由表面流,采用有限元法对钢液的流动规律进行研究,并对比分析自由液面以及铸辊的转动对熔池流场的影响。结果表明,把熔池液面处理成平面时,液面附近钢液的流速计算不真实,计算结果会使得液面处的速度在铸带宽度方向上分布极不均匀,不能用此模型研究熔池的液面波动情况;忽略铸辊的转速有可能导致熔池下部流场形式的变化,会使得下部回旋减弱甚至消失,误差较大。 相似文献
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为了探究双辊薄带振动铸轧技术中,艺参数对振动铸轧熔池流场和温度场的影响,采用有限元软件构建了双辊薄带振动铸轧熔池仿真模型。基于该模型,研究铜带厚度、铝板出口厚度和铸轧速度对熔池流场和温度场的影响,并通过轧辊急停获得双辊薄带振动铸轧熔池切片,验证了该模型的准确性。结果表明:铜带厚度、铝板出口厚度和铸轧速度对熔池流场的影响与轧辊振动相位有关,工艺参数与轧辊振动共同改变熔池流场。工艺参数变化对熔池上部温度场影响较小,对熔池下部尤其是熔池底部温度场影响较大。 相似文献
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张志达 《特种铸造及有色合金》2020,(1):64-68
以非晶合金新型双带连铸工艺为研究对象,考虑气体层与自由液面之间的交互作用,建立了熔池流动传热三维VOF两相流模型,通过对比分析,验证了新型布流器结构设计的合理性,考察了布流器水口倾角和浸入深度对熔池流场和温度场分布的影响。结果表明,新型布流器能够有效地降低熔池侧封区自由液面的波动程度;随着水口倾角和浸入深度的变化,熔池自由液面的波动速度和温度分布,均表现出强烈的"双波峰"现象;布流器水口倾角每增加15°,液面波动速度波峰约减小0.015m/s,温度波峰约减小10℃;水口浸入深度每增大5mm,液面速度波峰约减小0.01m/s,温度波峰约减小15℃;当水口倾角为30°,浸入深度为25mm时,熔池流场和温度场分布最为合理。 相似文献
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SIMULATION OF THE TWIN ROLL STAINLESS STRIP CASTING PROCESS 总被引:3,自引:0,他引:3
1. IntroductionTwin roll stainless strip casting' process which can directly cast a thin strip with thickness less than 10mm from a molten metal pool is being researched by industrious workersall over the world. Compared with the conventional continuous casting, this process caneliminate the expansive and complex hot-rolling facilities, and can reduce both the capitalinvestmellt and the cost of production. Among various processes under development, thetwin-roll strip casting is revealed as the… 相似文献
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1 INTRODUCTIONThedevelopmentofmodernmaterialprocessingscienceandtechnologyhasdriventhetransnormaloutfieldsmaterialprocessingtechnologytobeafavor abledevelopingandresearchdirectionoftwinrollcastingprocess[1,2 ] .Asweallknow ,theconven tionaltwinroll casting (CTRC)hasthefollowingdisadvantages :lowrollcastingspeed ;fewkindsofa luminumalloyswhichcouldbeproduced ;segregationandinhomogeneityexistingbothonthesurfaceandinsideofCTRCstrips ,andhardto producehighqualitystripsforhighgradeperforman… 相似文献
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双辊薄带高速铸轧机新技术 总被引:2,自引:0,他引:2
本文介绍了近年来出现的MDTRC、METRC和HPTRC等新型双辊铸轧机,对设备和工艺特点以及所得铸带的组织性能等参数进行了对比分析,指出立式TRC、铜质铸辊、无润滑、低过热度和半固态铸轧是提高铸轧速度的有效方法. 相似文献
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以镁合金薄带双辊铸轧新技术为背景,开展了铸轧成形过程中组织性能的模拟研究。镁合金薄带双辊铸轧是以液态镁合金为原料,用两个反向转动的水冷铸辊为结晶器,直接制备1.5~3.0mm镁合金薄带的短流程新工艺。对双辊铸轧轻合金薄带的凝固组织演化过程进行数值模拟,用以优化和指导制备技术,具有重要的理论意义和应用前景。项目研究组通过对双辊铸轧过程动态凝固成形的有限元数值模拟研究、镁合金薄带铸轧实验研究以及后续加工过程中的组织演变规律研究,得到了主要工艺参数对铸轧工艺稳定性及组织性能的影响规律。 相似文献
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Comparison of phosphor bronze metal sheet produced by twin roll casting and horizontal continuous casting 总被引:1,自引:0,他引:1
J. D. Hwang B. J. Li W. S. Hwang C. T. Hu 《Journal of Materials Engineering and Performance》1998,7(4):495-503
Much effort recently has been expended to study the strip casting process used to produce thin metal strip with a near final
thickness. This process eliminates the need for hot rolling, consumes less energy, and offers a feasible method of producing
various hard-to-shape alloys. The finer microstructure that results from the high cooling rate used during the casting process
enhances mechanical properties. In this study, strips of phosphor bronzes (Cu-Sn-P) metal were produced using a twin roll
strip casting process as well as a conventional horizontal continuous casting (HCC) process. The microstructures, macrosegregations,
textures, and mechanical properties of the as-cast and as-rolled metal sheet produced by these two methods were examined carefully
for comparative purposes. The results indicate that cast strip produced by a twin roll caster exhibit significantly less inverse
segregation of tin compared to that produced by the HCC process. The mechanical properties including tensile strength, elongation,
and microhardness of the products produced by the twin roll strip casting process are comparable to those of the HCC processed
sheet. These properties meet specifications JIS H3110 and ASTM B 103M for commercial phosphor bronze sheet. The texture of
the as-rolled sheet from these two processes, as measured from XRD pole figures, were found to be virtually the same, even
though a significant difference exists between them in the as-cast condition. 相似文献
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Twin roll strip casting of high strength Al alloys with high solute contents using asymmetric nozzle
We investigated the feasibility of producing high strength Al alloy sheets with high solute contents using a twin roll strip caster equipped with an asymmetric nozzle. The combination of twin roll casting and the asymmetric nozzle used in this study reduced centreline segregation and hot tear, thereby increasing the casting speed. These features of the strip casting allowed the dissolution of more solute elements, suggesting the potential development of high strength Al alloys with a range of Mg contents up to 10 wt-%. The workability and mechanical properties of the cast strips were also evaluated to assess the feasibility of producing high strength Al alloy sheets superior to the present limit of conventional techniques. 相似文献