高强度钢板U形件热冲压凹模结构拓扑优化

Topology optimization of hot stamping die structure on high-strength sheet metal for U shaped part

为降低热冲压凹模的生产成本和使用成本,基于板料热冲压数值模拟对凹模结构进行了拓扑优化设计.运用有限元软件ABAQUS建立热力耦合有限元模型,对高强钢板U形件的热冲压成形和淬火过程进行了数值仿真.提取凹模与板料间关键工况下接触应力作为凹模拓扑优化的外在载荷,建立约束凹模结构关键区域节点位移的体积最小化拓扑模型,对热冲压凹模结构进行拓扑优化设计,最终实现结构减重20%,且优化后凹模的变形和应力与优化前的结果相差甚微.研究内容对热冲压过程数值模拟和模具结构拓扑优化研究具有一定参考价值.

To reduce the production cost and use cost of hot stamping die,topology optimization of die structure was carried out based on numerical simulation about hot stamping.A finite element model based on thermal-mechanical coupled method was created through the software ABAQUS,numerical simulation on high-strength sheet metal for U shaped part＇s hot forming and cooling process was conducted.The contact stresses between blank and die at critical case were extracted to be the load for topology optimization,and an optimization model which aimed to minimize structure volume with nodal displacement constraints on the die structure crucial areas was created.Topology optimization of hot stamping die structure was carried out,and the weight of die structure was reduced by 20%,and die＇s stress and deformation almost kept the same with initial design conditions.The research provides reference for the study of numerical simulation for hot stamping process and topology optimization of hot stamping die structure.