CAJ | 학술논문

介绍了电镦研究方法及目标,就电镦研究现状,提出了从微观控制角度改进大规格电镦技术,在避免几何缺陷的同时,综合考虑电镦件的晶粒均细化。运用 MSC. Marc 有限元模拟分析软件平台自主开发子程序,建立了气阀件的电镦锻多物理场动态耦合有限元模型,通过构建电镦件晶粒度及不均匀度双目标函数,进行了气阀在具体方案下的有限元仿真监控,设计出了大规格气阀件的电镦电流非线性加载模式。进一步比较了该气阀件在优化前后晶粒度及不均匀度双目标函数值变化,以及其晶粒度与动态再结晶体积分数分布等色云图。结果表明：优化后的双目标函数值较优化前减小,优化前后的坯料均发生完全动态再结晶；但优化后坯料平均晶粒度为104.33μm,较优化前降低了26.29μm,优化后坯料晶粒度尺寸分布更加均匀。
개소료전대연구방법급목표,취전대연구현상,제출료종미관공제각도개진대규격전대기술,재피면궤하결함적동시,종합고필전대건적정립균세화。운용 MSC. Marc 유한원모의분석연건평태자주개발자정서,건립료기벌건적전대단다물리장동태우합유한원모형,통과구건전대건정립도급불균균도쌍목표함수,진행료기벌재구체방안하적유한원방진감공,설계출료대규격기벌건적전대전류비선성가재모식。진일보비교료해기벌건재우화전후정립도급불균균도쌍목표함수치변화,이급기정립도여동태재결정체적분수분포등색운도。결과표명：우화후적쌍목표함수치교우화전감소,우화전후적배료균발생완전동태재결정；단우화후배료평균정립도위104.33μm,교우화전강저료26.29μm,우화후배료정립도척촌분포경가균균。
The research methods and objectives about electric upsetting were introduced briefly and the improvement coming from the micro control perspective of large size electric upsetting technology was proposed based on the current re-search. Ensure that parts with electric upsetting attain homogenized and fine grain while avoiding geometrical defects. The FEM for valves with electric upsetting, a multi-field coupling technology, was established in virtue of essential secondary development of the finite element simulation software MSC. Marc. And the electric upsetting current with nonlinear loading was further designed on the basis of finite element simulation monitoring for valves under the concrete scheme after the ob-jective function about double target including grain size and inhomogeneous distribution was constructed. A further compari-son of the valve parts in the value of double target and the isochromatic nephogram of grain size and the volume fraction of dynamic recrystallization showed that the objective function value was reduced after the optimization and the average grain size after optimization was 104. 33 μm and reduced by 26. 29 μm though full dynamic recrystallization occurred. The re-sults show that valve blank acquire more uniform distribution.