摘要
针对板料冲压过程中的接触应力过大和分布不均导致模具的局部过早磨损问题,以典型的杯形件拉深成形过程为研究对象,研究板料的厚向异性指数R-和板平面各向异性度ΔR对接触应力的影响。推导了凹模圆角部位的接触应力计算式,分析了接触应力与R-和径向应力分布的关系;利用有限元法分别研究了各向同性板料、厚向异性板料、平面异性板料的接触应力在模具型面上的分布特征。理论计算与有限元模拟结果相吻合,研究表明,接触应力大小与R-成反比且其分布规律与板平面各向异性度有关,当ΔR<0时,接触应力在轧制方向最大,当ΔR>0时,接触应力在轧制方向最小。
For the problem of partial premature wear of the stamping die caused by the excessive and non-uniform contact stress in the stamping process of sheet metal and based on the typical cylindrical cup deep-drawing process, the influence of the normal anisotropy R and the planar anisotropy AR on the contact stress was investigated. The equation of contact stress at die radius was deduced. The correla- tion among the contact stress, R and the distribution of the radical stress was researched. The distribution of the contact stress on the iso- tropic sheet, the normal anisotropic sheet and the planar anisotropic sheet was investigated by the finite element method respectively. The theoretical calculation was in well consistent with the numerical simulation results. Conclusion shows that the contact stress is inversely proportional to R and its distribution depends on the planar anisotropy. The maximum contact stress is at the rolling direction when ΔR 〈 0, whereas the minimum contact stress is at rolling direction when ΔR 〉 0.
出处
《锻压技术》
CAS
CSCD
北大核心
2015年第4期14-19,共6页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51275146)
教育部科学研究重大项目(311025)
第47批"留学回国人员科研启动基金"
关键词
各向异性
拉深成形
接触应力
有限元方法
anisotropy
deep-drawing
contact stress
finite element method
