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通过分析大型铸钢锭内部疏松缺陷的物理性质和变形特征,将疏松缺陷视为多孔可压缩材料,利用多孔可压缩材料的刚塑性有限元方法,建立了Cr5型支承辊钢锻件内部疏松缺陷锻造压实过程的非线性有限元模型。通过数值模拟,研究了上下V型砧锻造工艺下,疏松体缺陷的初始孔隙率、砧宽比、接触摩擦系数和压下量等因素对其致密压实效果的影响。在Gleeble-3500热模拟机上对具有人工制备内部疏松缺陷的圆柱体试件进行了单砧压下锻造实验,通过对疏松体变形致密过程的显微金相和密度分析,对有限元模拟结果进行了验证,两者吻合较好,为疏松缺陷压实效果预报与锻造成形工艺参数的制定提供了重要依据。
Based on the analysis of physical properties and deformation characteristics of loose castings in large cast ingots, porous defects were regarded as porous compressible materials. The rigid-plastic finite element method of porous compressible materials was used to establish the internal forging defects Nonlinear finite element model of compaction process. Through numerical simulation, the effect of initial porosity, anvil width ratio, contact friction coefficient and reduction on the compact compaction effect of the upper and lower V-shaped forgings was studied. The single-anvil forging experiment was carried out on a Gleeble-3500 thermal simulator to test the cylindrical specimens with internally-produced loose defects. The results of finite element simulation were obtained through the microstructure and density analysis of the densification and densification of loose bodies. The results are in good agreement with each other, which provides an important basis for forecasting compaction effect of loose defects and formulating process parameters for forging.