特厚板轧制缺陷压合模拟研究.pdfVIP

第44 卷 第 9 期 钢 铁 Vol. 44, No. 9 2 0 0 9 年 9 月 Iron and Steel September 2009 邓 伟, 赵德文, 秦小梅, 杜林秀, 高秀华, 刘相华 ( 东北大学轧制技术及连轧自动化国家重点实验室, 辽宁 沈阳 110004) : 某厂Q345 特厚板粗轧过程中缺陷的压合条件, 以二维刚2 粘塑性有限元法进行了数值模拟。结果表明: 在足够的压下率下,特厚板中矩形缺陷能够被压合, 缺陷的尺寸及在厚度方向的位置 缺陷压合有很大影响;板坯 表面的缺陷压合所需的临界压下率最大,t/ 8( t 代表厚度)处所需的临界压下率最小, 即表面处的缺陷最难压合, 缺 陷压合由难到易按所处位置依次为表面、t/ 2、t/ 4 和t/ 8,将该厂特厚板轧制道次压下率提高到18% 以上, 将可有效 避免成品中缺陷的出现;矩形缺陷的长高比K 越大, 临界压下率越小, 越易压合; 当K 从小于1 增大到大于1 的过程 中, 临界压下率急剧减小, 但当K继续增大, 临界压下率减小的趋势变得比较平缓; 当K 1 时, 呈双/ Y0 型闭合; 当 K\ 1时, 呈/ Z0 型闭合。 : 特厚板; 缺陷压合; 临界压下率; 有限元模拟 : TG 335. 5 : A : 04492 749X(2009)092 00582 05 Simulation of Defects Closing Behavior During Ultra2Heavy Plate Rolling DENG Wei, ZHAO De2wen, QIN Xiao2mei, DU Lin2xiu, GAO Xiu2hua, LIU Xiang2hua ( State Key Laboratory of Rolling and Automat ion, Northeast ern University, Shenyang 110004, Liaoning, China) Abstract: The closing behavior of defects in continuous cast ing steel slab during rough transverse rolling was investi2 gated using FE2 code, ANSYS/ LS2DYNA. Process parameters of ultra2heavy Q345 steel plate obtained from a Chi2 nese iron and steel works were used as a reference. The slab of initial width 3500 mm and thickness 320 mm was rolled down to 140 mm. The results indicate that rectangular defect s in ultra2heavy plate can be closed with appro2 priate reduction. The size and location of defects have evident influence on closing behavior . Surface defects needs the largest crit ical reduct ion to close, and