X.B.Lin
,
H.S.Xiao
,
Z.L.Zhang
金属学报(英文版)
During the process of finite element simulation of precision warm forging,the selec-tion of friction models has a direct effect on the precision accuracy of finite element simulation results.Among all the factors which inftuence the selection of friction models,hte distribution rule of mormal stress at the tool-workpiece interface is a keyone.To find out the distribution rule of normal stress at the tool-workpiece inter-face,this paper has made a systematic research on three typical plastic deformation processes:forward extrusion,backward extrusion,and lateral extrusion by a method of finite element simulation.Then on the base of synthesizing and correcting tradi-tional friction models,a new general friction model which is fit for warm extrusion is developed at last.
关键词:
friction model
,
null
,
null
张明
,
彭艳
,
孙建亮
,
张阳
钢铁
doi:10.13228/j.boyuan.issn0449-749x.20160148
针对2160 mm热连轧机组第2架精轧机（F2）在轧制薄规格产品时频繁发生振动的问题，对该轧机开展了综合测试。介绍了振动现象，分析了振动类型。考虑轧制界面动特性，建立了新的轧制界面摩擦力模型，表征了界面的正负阻尼作用。在此基础上，考虑上下辊系不同运动状态构建了轧机扭转和水平方向的耦合振动模型。基于上述模型，模拟了轧机的自激振动，仿真结果表明，轧机振动形式为上下工作辊扭转和水平方向均反向运动，振动频率为扭转一阶固有频率，与现场测试现象相符合。最后分析了轧制工艺参数对轧机自激振动的影响，并提出了相应的可行抑振方案。
关键词:
振动测试
,
耦合振动
,
摩擦力模型
,
自激振动
,
运动反向
