【摘要】 为研究无缝钢管张力减径过程中钢管壁厚不均现象,建立无缝钢管张力减径过程三维热力耦合模型。模拟所得壁厚与实测结果误差最大不超过5.2%。模拟结果直观显示钢管在轧制过程中内壁形状的变化过程,最终内壁形状为规则的正六方形。分析张力减径过程中摩擦力的分布,结果表明,摩擦力沿钢管圆周分布不均,使得在辊底处形成附加轴向压应力,辊缝处形成附加轴向拉应力,从而影响壁厚变化不均。进一步研究钢管初始温度对成品壁厚分布的影响,模拟结果表明,随着钢管初始温度的升高,钢管壁厚不均现象得到明显改善。更多还原

【Abstract】 A set of 3D thermal-mechanical coupled finite element model was established to simulate the deformation process of tube on 8 stretch reducing mills.The obtained result from simulation is close to the measured results and the biggest deviation is less than 5.2%.Simulation results display deformation process of the tube cross section after each pass.The final tube cross section shape is regular hexagon.In addition,the friction distribution in reducing process is analyzed.Results show the friction force is uneven along circumferential direction,which gives rise to additional axial compressive stress at the bottom of roll but tensile stress at the roll gap.This intensifies the non uniformity of tube thickness.For further information,the influence of initial temperature on tube thickness is studied and it is found obvious refinement of thickness deficiency with the increase of initial temperature.更多还原