摘要
大规格气阀电镦过程是一个超长程、超长时塑性变形过程,如何通过设计电镦加载路径以实现变形和晶粒尺寸的协调控制是一个困难且重要的问题。针对此问题,基于电-热-力多场耦合分析理论和晶粒尺寸演变模型,建立了大规格气阀电镦成形过程有限元模型;设计了电流和镦粗力的多级加载路径,研究了不同加载模式对电镦成形件的形状、温度和晶粒尺寸的影响规律。结果表明,增大电流可使温度显著升高,进而导致晶粒粗化,而较大的镦粗力可使温度降低,从而起到细化晶粒的作用。通过协调电流和镦粗力的峰值位置和水平可获得形状圆滑、晶粒细小的电镦件。此外,基于BP神经网络模型和案例推理方法,开发了大规格气阀电镦工艺加载模式设计系统,实现了电镦工艺参数加载模式的智能化设计。
The electric upsetting process of large-scale valves is an ultra-long and ultra-time plastic deformation process,it is difficult and important to design the loading path of electric upsetting to achieve coordinated control of deformation and grain size.Therefore,based on the above problem,a finite element model for the electric upsetting process of large-scale valves was constructed based on the electrical-thermal-mechanical multi field coupling analysis theory and the grain size evolution models.Then,the multistage loading paths involving current and upsetting force were designed,and the influence laws of different loading modes on the shape,temperature and grain size of formed parts during electric upsetting were studied.The results show that increasing current significantly increases the temperature and leads to grain coarsening,while larger upsetting force decreases the temperature,thereby refining the grain size.By coordinating the positions and levels of peak values for current and upsetting force,the electric upsetting parts with smooth shape and fine grain can be obtained.In addition,based on the BP neural network model and case-based reasoning method,a design system for the loading mode of electric upsetting process in large-scale valves is developed,and the intelligent design of loading mode for the electric upsetting process parameters is achieved.
作者
权国政
余炎泽
赵江
许东晓
戴魏魏
Quan Guozheng;Yu Yanze;Zhao Jiang;Xu Xiaodong;Dai Weiwei(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Jiangsu Engineering Technology Research Center for Advanced Manufacturing of Ship Power System Components,Cosco Shipping Marine Equipment&Spares(Nanjing)Co.,Ltd.,Nanjing 211121,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2024年第7期160-167,共8页
Forging & Stamping Technology
基金
国家自然科学基金面上项目(52175287)
重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0593)。
关键词
气阀
电镦
组织演化
参数加载路径
多场多尺度耦合
valve
electric upsetting
microstructure evolution
loading path of parameter
multi-field and multi-scale coupling
