三维蠕变有限元鼓肚计算系统开发与应用
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摘要
在铸机辊列计算中,鼓肚量是一个重要的设计参数,铸坯产生鼓肚后会增加拉坯阻力,严重时无法通过扇形段,使生产被迫中断,也容易损坏设备。鼓肚的铸坯,中心偏析加重,容易形成中心一字形的裂纹等铸坯质量问题。准确的计算鼓肚对铸机设计有重要的指导作用。在工程实际中,板坯有鼓肚计算的经验公式,但是在计算大方坯鼓肚时误差较大。为解决大方坯鼓肚量计算问题,采用粘弹性蠕变模型,考虑了蠕变在时间上的影响,利用三维有限元方法,开发了相应的鼓肚计算系统。在营销、工程设计中,给出鼓肚量计算结果,指导密排辊列夹持长度设计,取得了良好的应用效果。
In the casting machine roller design calculation, bulge size is an important design parameter. It makes the withdrawal resistance of the bulging slab increase. When the bulging is serious, the billet cannot through the caster's sector section, so the production is forced to interrupt and the equipments are damaged easily. Central segregation of bulging billet is increased, so there are many quality problems such as a line crack in the center of billet. Computing bulging accurately has the important instruction function to the casting machine design. In the "slab continuous casting machine", the empirical formula of slab bulge is given, but to bloom the error is too large. In order to solve the problem of computing the bloom bulging, using viscoelastic creep model and three-dimensional finite element method, the bulge size was calculated, and the corresponding development of bulging computing system was developed. In marketing and engineering design, the bulging calculating results guided the design of the dense roller column clamping length, a good applied effect was achieved.
In the casting machine roller design calculation, bulge size is an important design parameter. It makes the withdrawal resistance of the bulging slab increase. When the bulging is serious, the billet cannot through the caster's sector section, so the production is forced to interrupt and the equipments are damaged easily. Central segregation of bulging billet is increased, so there are many quality problems such as a line crack in the center of billet. Computing bulging accurately has the important instruction function to the casting machine design. In the "slab continuous casting machine", the empirical formula of slab bulge is given, but to bloom the error is too large. In order to solve the problem of computing the bloom bulging, using viscoelastic creep model and three-dimensional finite element method, the bulge size was calculated, and the corresponding development of bulging computing system was developed. In marketing and engineering design, the bulging calculating results guided the design of the dense roller column clamping length, a good applied effect was achieved.
引文
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[12]屈天鹏,王水银,冯科.连铸工艺对方坯凝固组织影响的数值模拟[J].连铸,2013(6):7.
[2]罗秉臣,孟令忠.连铸板坯坯壳鼓肚变形量的有限元分析[J].重型机械,1995(6):6.
[3]蔡开科.连铸坯中心缺陷控制.现代连铸技术进展[M].北京:冶金工业出版社,2003.
[4]Battle T P.Computer simulation of microsegregation during the solidfication of Steel[J].Steelmaking Conference Proceeding,1987(70):121.
[5]盛义平.板坯连铸鼓肚变形计算[J].钢铁,1993,28(3):21.
[6]Weinberg F.The ductility of continuously cast steel near the melting point[J].Metal Trans B,1979(10):219.
[7]阎小林,宁宝林.连铸坯热应力状态的数值模拟[J].东北工学院学报,1989,10(1):91.
[8]王朕增.连铸板坯的鼓肚应变与设备工艺参数的关系[J].钢铁研究学报,1989,1(1):9.
[9]宁振宇,吴迪平,秦勤,等.板坯连铸三维鼓肚变形仿真研究[J].冶金设备,2007(2):5.
[10]吴家龙.弹性力学[M].北京:高等教育出版社,2001.
[11]刘明延,李平,栾兴家,等.板坯连铸机(上册)[M],北京:机械工业出版社,1990.
[12]屈天鹏,王水银,冯科.连铸工艺对方坯凝固组织影响的数值模拟[J].连铸,2013(6):7.