半圆拉深筋参数与DP590钢板后续性能的预测分析

Prediction analysis for semicircle drawbead parameters and subsequent performance of DP590 sheet metal

高强钢板通过拉深筋后会出现塑性降低、提前破裂问题,严重影响板材后续成形,因此进行冲压模具设计时不能忽视高强钢板变形不同阶段成形性能的变化。利用正交试验研究了拉深筋结构参数对DP590高强钢板后续成形性能的影响,通过方差分析揭示了各因素对指标的影响规律,结合试验数据回归分析方法,建立了拉深筋阻力、DP590板后续成形性能与拉深筋结构参数对应关系的预测方程,根据预测方程及方差分析结果,总结了DP590高强钢板的拉深筋结构参数设计原则,为DP590高强钢冲压成形质量控制、工艺调整及有限元数值模拟计算中等效拉深筋的设置提供了参考依据。

Plasticity reduction and early crack appear after high strength steel sheet metal going through the drawbead, which affects the subsequent formability of the sheet metal seriously. So the changes of the formability of high strength steel sheet metal at different deformation stages cannot be ignored when the corresponding stamping moulds are designed. Orthogonal experiment was designed to investigate the influence of the structural parameters of drawbead on the subsequent formability of high strength steel sheet metal, then the ilffluence regu- larity of various factors on experiment indexes was revealed by analysis of variance. Prediction equations were established by experimental data regression analysis to describe the regularity between drawbead restraining force, the subsequent formability of high strength steel sheet metal and the structural parameters of drawbead. According to the prediction equations and the result of variance analysis, the de- sign principles of the structural parameters of drawbead were presented, which provided references for the stamping quality control of high strength steel DP590, process adjustment and the equivalent drawbead setting in finite element numerical simulation.