论文部分内容阅读
借助刚塑性有限元DEFORM-3D对4Cr9Si2马氏体耐热钢楔横轧成形过程进行了数值模拟,分析了展宽角对楔横轧轧件成形缺陷的影响规律.在楔横轧轧制刚楔入时,轧件的心部受到三向拉应力的作用;展宽角减小,轧件在楔入段时三向拉应力最大值和持续时间增大,使心部缺陷产生的可能性增加;而展宽角减小,金属轴向流动速度加快,使得对称中心在楔入段完成后的直径减小,而轴向力则随着展宽角减小,其数值还有一定的增大,最终将导致对称中心横截面拉细状况的产生;随着展宽角增大,表面螺旋痕将会增加,但展宽角对表面螺旋痕的影响不明显.通过实验验证了有限元的正确性和模拟结果的可靠性.
The rigid-plastic finite element method DEFORM-3D was used to simulate the cross-rolling of 4Cr9Si2 martensite heat-resistant steel and the effect of spreading angle on the forming defects of the cross-wedge rolling was analyzed. When entering, the heart of rolling is subjected to three-direction tensile stress; the broadening angle is reduced; the maximum value and duration of three-direction tensile stress increase during the wedging of the rolling stock, which increases the possibility of heart defects; While the broadening angle decreases and the axial velocity of the metal accelerates, the diameter of the center of symmetry decreases after the wedging step is completed, while the axial force decreases with the broadening angle, and the numerical value increases to a certain extent. Finally, Which leads to the thinning of the cross section of the center of symmetry. As the broadening angle increases, the surface helix will increase, but the effect of broadening angle on the surface helix is not obvious. The validity of the finite element method and the simulation results reliability.