摘要
为了准确模拟重量为5×10^(4) kg的42CrMo钢锭的镦粗冲孔塑性成形过程,讨论了塑性变形的几何相似条件、力学相似条件和物理相似条件及摩擦条件在有限元成形仿真计算中的处理方式。总结出影响塑性成形仿真计算的主要因素为砧子速度、材料自身特性、形变时间、温度及摩擦条件;提出了仿真42CrMo钢锭镦粗冲孔过程中合适的计算单元、材料特性参数、摩擦处理方式及热交换系数等,并使用现有的20 MN压机进行验证;然后分别模拟成形力为200、250和300 MN时一火成形的5×10^(4) kg钢锭镦粗冲孔成形过程,统计不同成形力下的镦粗冲孔仿真结果。结果显示了坯料成形状态与成形力及成形时间的相关性,为压机设计制造提供了技术支持。
In order to simulate the plastic forming process of upsetting and punching for 42CrMo steel ingot with the weight of 5×10^(4) kg accurately,the treatment methods of geometric similarity condition,mechanical similarity condition,physical similarity condition and friction condition for plastic deformation in finite element forming simulation were discussed,and the main factors affecting the simulation calculation of plastic forming such as anvil speed,material autologous characteristic,deformation time,temperature and friction condition were summarized.Then,the proper calculation element,material characteristic parameters,friction treatment method and heat exchange coefficient of 42CrMo steel ingot in the simulation of upsetting and punching process were proposed and verified by the existing press of 20 MN.Furthermore,the upsetting and punching process of 5×10^(4) kg steel ingot formed by one fire with the forming forces of 200,250 and 300 MN were simulated respectively,and the simulation results of upsetting and punching under different forming forces were listed.The results obtain the correlation of billet forming state with forming force and forming time,which provides the technical support for the design and manufacture of press.
作者
苏芳
王勇
薛峰
Su Fang;Wang Yong;Xue Feng;无(Technology Center,Taiyuan Heavy Industry Co.,Ltd.,Taiyuan 030024,China;Technology Center,TZ(Tianjin)Binhai Heavy Machinery Co.,Ltd.,Tianjin 300452,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2024年第8期6-12,共7页
Forging & Stamping Technology
基金
天津市科技领军(培育)企业认定及支持项目(20YDLZGX00290)
天津市“项目+团队”重点培养专项(XC202050)。
关键词
塑性成形
镦粗
冲孔
刚黏塑性有限单元
锻造温度
plastic forming
upsetting
punching
rigid-viscoplastic finite element
forging temperature
