王寅张振强于湛贾皓邓康雷作胜任忠鸣
金属学报
doi:10.3724/SP.J.1037.2011.00215
以水银为介质, 通过物理模拟实验考察射流型磁场排布方式对中厚板坯连铸结晶器内流场的控制. 采用超声波Doppler测速仪测量有、无磁场下的结晶器内液态金属流速, 研究磁场排布和强度对水口出流、结晶器内流动、液面流动、结晶器窄面模壁的冲刷作用等的影响. 实验显示, 射流型磁场排布方式使水口出流流速受到比通常磁场排布方式更强的抑制作用, 使其在撞击结晶器窄壁前发生分散,可使上环流流速增强, 下环流减弱直至消失, 直接形成活塞流形式; 同时, 还改善了弯月面处流动情况. 相比于工业生产中的全幅一段电磁制动技术,射流型磁体排布方式的电磁制动在水口出流、液面处流动方面具有更强的制动作用.
关键词:
连铸
,
mold
,
electromagnetic braking
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physical simulation
,
jet–pattern magnetic field
$ D.L*
,
D.N.He
,
X.J.Bao
,
Y. Q.Zhang
,
X. Y.Ruan
,
J.L. Cheng and J. Y. Jiang 1) National Die & Mold CAD Engineering Research Center
,
Shanghai Jiaotong University
,
Shanghai 200030
,
China 2) Shanghai Volkswagen Automotive Company Limited
,
Shanghai 201805
,
China
金属学报(英文版)
With the combination of a new theoretical formula, physical simulation experiments, the technology of artificial neural network and database, an intelligent system for the prediction of sheet metal drawing capability is constructed for the first time. A modified criterion for sheet metal drawing capability is proposed in this paper, namely, the Technological Limiting Drawing Ratio, TLDR = f(R, n, s, t, F, μ,r_d,r_p…). Based on the studies of other scholars, a new formula is derived to predict the TLDR in this paper. Then a series of orthogonal physical simulation experiments are designed to investigate the effect of technological parameters on the TLDR, and the results are analyzed in the paper. Then the predicting system is constructed with the combination of the theoretical formula, orthogonal experiments, the technology of artifocial neural network and database. The predicted results show good agreements with experimental data, so it can be used to avoid the blindness in the selection of sheet metal before stamping. The system operates under the Windows operating system, and it supports the mechanism of Client/Server as well as Intranet, so the system has high engineering value.
关键词:
TLDR
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null
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null
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null
,
null
,
null
,
null
卢叶
,
唐萍
,
文光华
,
彭情亮
,
刘丙岗
钢铁研究学报
针对攀钢200t钢包,采用物理模拟与数值模拟相结合的方式,研究了透气砖布置方式和吹氩流量对钢液流动行为的影响规律.结果表明,当两透气砖呈120°布置在距包底中心0.62R (R为包底半径)处时,钢液的平均流速和平均湍动能大,“死区”范围小,混匀时间短,是合理的透气砖布置方式,其临界吹氩流量为27 m3/h;与单透气砖相比,双透气砖喷吹的能量利用率高,“死区”范围小,单透气砖的吹氩流量需控制到45m3/h才能达到与双透气砖吹氩流量为27 m3/h时相同的搅拌效果.实践证明,研究得到的透气砖布置方式和吹氩流量能保证熔池的搅拌效果,使转炉钢水经吹氩处理后,钢包不同位置温差小于10℃,△w[C],△w[Si],△w[Mn]小于0.03％;在一定的软吹氩流量条件下,吹氩时间大于等于8 min,可以使钢中wT[o]小于25×10-6.研究表明,用离散相模型对钢包底吹氩过程进行数值模拟,可以得到与物理模拟试验和生产实践较为吻合的结果.
关键词:
钢包
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透气砖布置
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吹氩流量
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物理模拟
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数值模拟
张彩军
,
刘涛
,
王昂
,
顾克井
,
朱立光
钢铁钒钛
doi:10.7513/j.issn.1004-7638.2014.02.019
以某公司矩形坯连铸机结晶器为研究对象,利用数值模拟和物理模拟相结合的方法,对结晶器内自由液面流动和流场进行系统分析,分别研究不同出口面积比、不同浸入深度、不同水口倾角等条件下结晶器内钢液流动状态,并对相应的工艺参数进行优化.结果表明,对于断面为150mm×440mm的矩形坯,最优的结晶器浸入式水口出口面积比为2.42,内径30 mm,侧开孔角度25°.
关键词:
连铸
,
结晶器
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浸入式水口
,
数值模拟
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物理模拟
,
结构优化
