中文摘要：

基于气门二次楔轧制原理，采用DEFORM-3D有限元软件研究了成形角改变时轧件心部应力和应变的变化规律，分析了成形角对楔横轧21—4N合金钢气门心部质量的影响．结果表明：随着成形角的增大，轧件心部的应力状态和应变状态更为合理，有利于防止心部疏松．相应的轧制实验结果验证了这个结果．

英文摘要：

Based on the mechanism of twice wedge rolling for valves, changes in stress and strain of a 21-4N valve at the center with forming angle were investigated using the finite element software DEFORM-3D. The effect of forming angle on the central quality of the rolled piece was analyzed. It is found that a larger forming angle can lead to a more reasonable distribution of both stress and strain in the center of the rolled piece, which is positive to prevent central cavities. Laboratory experiments show the same result.