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介绍了龙形轧制方法,运用大变形热力耦合有限元法分析了龙形轧制和对称轧制铝合金厚板变形区内轧件的变形情况,比较了龙形轧制和对称轧制条件下轧板不同位置剪切应变的分布情况,并研究了上下轧辊错位量、异速比、摩擦系数和压下量对轧板心部剪切变形的影响。结果表明:对称轧制中厚板心部的剪切应变几乎为0;龙形轧制中由于有“搓轧区”存在,厚板心部的剪切应变远远大于对称轧制,且心部的剪切应变随着轧辊错位量、异速比、摩擦系数和压下量的增大而增大。为了获得较大的剪切应变同时保证较小的弯曲曲率,在龙形轧制中应合理选择这些工艺参数。
Introduced the dragon-shaped rolling method, using large deformation and heat-coupled finite element method analysis of the deformation of the rolling deformation of the dragon-shaped rolling and symmetrical-rolled aluminum alloy plate deformation zone, compared the dragon-shaped rolling and symmetrical rolling conditions The distribution of shearing strain at different positions of the rolling plate and the influence of the displacement of the upper and lower rolls on the shearing deformation of the rolling plate were investigated. The results show that the shear strain in the center part of symmetrical rolled plate is almost zero. Due to the presence of “rubbing rolling zone” in the radial rolling, the shear strain at the center of the thick plate is far greater than that of the symmetrical rolling. And the shear stress of the heart part increases with the misalignment of rolls, allochronous ratio, friction coefficient and reduction. In order to obtain a larger shear strain while ensuring a smaller curvature of curvature, these process parameters should be selected rationally in dragring.