带纵筋平板的轧制成形规律与极限研究

Research on rolling law and limit for plate with longitudinal rib

带纵筋平板是一种结构复杂的异型板,其在轧制成形过程中型槽内金属填充不足、凸筋成形难的问题比较突出。针对该问题,提出了一种新的带纵筋平板轧制成形工艺方法,采用两道次将带纵筋平板轧制成形。将第1道次轧制的轧辊组设计成上辊有型槽、下辊有弧形的凸起结构;在第2道次轧制的轧辊组中,将上辊设计成与第1道次同尺寸的型槽,下辊设计为平辊。采用这种多道次轧制方法可以有效地促进金属向上辊型槽内流动,促进凸筋的增长。通过Abaqus有限元模拟,分析了辊型结构对筋高和成筋率的影响规律以及不同板厚的凸筋的成形极限,从而得到成形较好的工艺参数。通过开展实验,发现实验结果和模拟结果基本一致,这为后续的异型板的精密成形研究提供了理论基础。

The plate with longitudinal rib is a shaped plate with complex structure,and the problems of insufficient metal filling in the groove and difficulty in forming ribs are more prominent in the rolling process.For the above problems,a new rolling process method for the plate with longitudinal rib was proposed to roll the plate with longitudinal rib by two passes.Then,the roller group of the first pass rolling was designed with a groove on the upper roller and an arc-shaped convex structure on the lower roller,and for the roller group of the second pass rolling,the upper roller was designed to have the groove with the same sizes as the first pass and the lower roller was designed as a flat roller.Therefore,this multi-pass rolling method could effectively promote the flow of metal into the upper roller groove and the growth of rib.Furthermore,the influences of roller structure on the rib height and the rib raised ratio as well as the forming limit of ribs with different plate thicknesses were analyzed by finite element simulation Abaqus,and the better forming process parameters were obtained.Finally,through experimental verification,the results show that the obtained simulation results are basically consistent with the experimental results to provide a theoretical basis for the subsequent precision forming research of shaped plates.