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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。
Aiming at the problem of premature wear of the mold caused by excessive contact stress and uneven distribution in the process of sheet metal stamping, the typical cup forming process is taken as the research object to study the sheet thickness anisotropy index R- and plate plane Effect of anisotropy ΔR on contact stress. The relationship between contact stress and R- and radial stress distribution was analyzed. The isotropic sheet, the anisotropic sheet, the anisotropic sheet Distribution characteristics of material contact stress on the mold surface. The theoretical calculation is consistent with the finite element simulation results. The results show that the contact stress is inversely proportional to R- and its distribution is related to the plane-plane anisotropy. When ΔR <0, the contact stress is the largest in the rolling direction. When ΔR > 0, the contact stress is the smallest in the rolling direction.