大规格GH4169合金棒材锻造过程数值模拟研究

Numerical Simulation Research on the Forging Process of Large-Sized GH4169 Alloy Bars

摘要:

针对GH4169大型棒材开坯锻造过程,采用有限元模拟软件Simufact Forming对GH4169合金锻造全过程进行仿真模拟,研究了锻造过程中工件应变场和温度场的分布,并对镦粗和拔长过程中工件整体外形变化情况进行了分析。结果表明:镦粗过程中试样各个位置等效应变分布不均匀,大致呈现"X"型分布,砧子与锻件接触的区域基本不变形,该区域温度和等效应变均较低。拔长过程中,锻件表面区域与空气和上下砧子存在热交换,等效应变高而温度低,且等效应变呈一定周期性分布。锻件的头尾区域形成往内凹陷的状态,是内外金属流动性差异较大所致。

Abstract:

For the roughing forging process of the large GH4169 billet, the finite element simulation software Simufact Forming was adopted to conduct a simulation of the entire forging process of the GH4169 alloy. The distribution of the strain field and temperature field during the forging process was studied, and the overall shape changes of the workpiece during the upsetting and elongation processes were analyzed. The results show that during the upsetting process, the equivalent strain distribution at various positions of the sample is uneven, roughly presenting an "X" shape distribution. The area where the anvil contacts the workpiece remains basically undistorted, and the temperature and equivalent strain in this area are relatively low. During the elongation process, there is heat exchange between the surface area of the forged piece and the air and the upper and lower anvils. The equivalent strain is high while the temperature is low, and the equivalent strain shows a certain periodic distribution. The head and tail areas of the workpiece form an inwardly concave state, which is due to the significant difference in metal fluidity between the inside and outside.