摘要
对铝合金轴对称零件热挤压成形进行了理论分析,总结出零件成形极限的影响因素及规律。通过建立法兰类轴对称零件在热挤压成形过程中变形区应力计算的力学模型,得出应力变化和法兰区外径最大尺寸的表达式。并通过不同应力状态下临界尺寸表达式的对比,分析径向压力P、材料与模具之间的摩擦力τ以及法兰区厚度t对法兰区外径最大尺寸Rmax的影响规律,为实验过程中成形极限的预测提供一定理论依据。
The influence factors and rules of the forming limit of aluminum alloy axisymmetric part in the hot extrusion process were theoretically analyzed.Through setting up the mechanical model of the stress state in the hot extrusion process of aluminum alloy axisymmetric flange parts,obtain the expression of the stress state and the maximum diameter in flange region.At the same time,through the comparison of different stress conditions.The regulation of the pressure P in the outer of flange,the friction τ between the material and tool and the thickness t of flange region for the maximum diameter in flange region was analyzed,in order to offer theoretical basis for predicting the forming limit.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2011年第8期1-4,共4页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(50774026,50875059)
中国博士后科学基金资助项目(20070420023)
国家863高新科技资助项目(2008AA03A239)
关键词
法兰件
热挤压
应力
平衡微分方程
成形极限
flange part
hot extrusion
stress
equilibrium equation
forming limit
