研究的H型钢Q235(/%:0.06c、0.30si、1.60Mn、0.010P、0.003S、0.025Mo、0.40Ni、0.017Ti、0.15Cu)由80 t LD-LF-喂硅钙线-28 t中间包-430 mm×300 mm×85 mm H型连铸一热轧工艺生产。由于H型铸坯易产生纵裂纹缺陷,根据H型连铸...研究的H型钢Q235(/%:0.06c、0.30si、1.60Mn、0.010P、0.003S、0.025Mo、0.40Ni、0.017Ti、0.15Cu)由80 t LD-LF-喂硅钙线-28 t中间包-430 mm×300 mm×85 mm H型连铸一热轧工艺生产。由于H型铸坯易产生纵裂纹缺陷,根据H型连铸坯采用直通型浸入式双水口浇铸的实际工艺参数建立数学模型,采用流体有限元软件CFD进行结晶器流场和温度场分布汁算,得出直通型双水口浇铸时,熔池冲击深度大,不利夹杂上浮;液面得不到足够热量补充,导致坯壳过早凝固,不利于化渣。数值模拟结果表明,改用三侧孔水口进行浇铸,避免了直通型水口的不利因素,流场和温度场分布合理,可降低漏钢事故和裂纹发生的机率。展开更多
Concept design is vital important in development of auto-body and it has great effects on later design work.In this paper,a twolevel cross-sectional optimization approach is presented to shorten concept design cycles...Concept design is vital important in development of auto-body and it has great effects on later design work.In this paper,a twolevel cross-sectional optimization approach is presented to shorten concept design cycles.First,an exact structural analysis approach for spatial semi-rigid framed structures,i.e.,the transfer stiffness matrix method proposed in our previous study,is adopted for both static and dynamic analyses of body-in-white(BIW)structure.A two-level cross-sectional optimization approach is then proposed for an automotive BIW lightweight design,and genetic algorithm is used to solve the optimization models.Afterward,an object-oriented MATLAB toolbox,using distributed parallel computing techniques,is developed to promote the concept design of the BIW structure.Finally,relevant numerical examples demonstrate the validity and accuracy of the proposed method.展开更多
文摘研究的H型钢Q235(/%:0.06c、0.30si、1.60Mn、0.010P、0.003S、0.025Mo、0.40Ni、0.017Ti、0.15Cu)由80 t LD-LF-喂硅钙线-28 t中间包-430 mm×300 mm×85 mm H型连铸一热轧工艺生产。由于H型铸坯易产生纵裂纹缺陷,根据H型连铸坯采用直通型浸入式双水口浇铸的实际工艺参数建立数学模型,采用流体有限元软件CFD进行结晶器流场和温度场分布汁算,得出直通型双水口浇铸时,熔池冲击深度大,不利夹杂上浮;液面得不到足够热量补充,导致坯壳过早凝固,不利于化渣。数值模拟结果表明,改用三侧孔水口进行浇铸,避免了直通型水口的不利因素,流场和温度场分布合理,可降低漏钢事故和裂纹发生的机率。
基金The authors acknowledge financial support from the National Natural Science Foundation of China(No.51475152).
文摘Concept design is vital important in development of auto-body and it has great effects on later design work.In this paper,a twolevel cross-sectional optimization approach is presented to shorten concept design cycles.First,an exact structural analysis approach for spatial semi-rigid framed structures,i.e.,the transfer stiffness matrix method proposed in our previous study,is adopted for both static and dynamic analyses of body-in-white(BIW)structure.A two-level cross-sectional optimization approach is then proposed for an automotive BIW lightweight design,and genetic algorithm is used to solve the optimization models.Afterward,an object-oriented MATLAB toolbox,using distributed parallel computing techniques,is developed to promote the concept design of the BIW structure.Finally,relevant numerical examples demonstrate the validity and accuracy of the proposed method.
