Abstract

Because of the elastic deformation of rolling mills in rolling, the edge drop in thickness of rolled ultra-high strength steel sheet was remarkable, thus the thickness distribution was not uniform. The distribution of angle before and after unloading in V-bending of the ultra-high strength steel sheets having such a thickness distribution was measured. The bend angle was nonuniformly distributed by the insufficient bend angle at the bottom dead centre and springback during unloading. The effects of the bent angle and thickness distribution on the springback in thin and thick edges were discussed. The distribution of bend angle was reduced by bottoming with a three-piece die using a rubber pad. It was found that bottoming with a divided die using a rubber pad in bending is effective in improving the dimensional accuracy of ultra-high strength steel sheets having a thickness distribution by finite element simulation and experiment.

中文翻译：

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由具有厚度分布的超高强度钢板产生均匀角度分布的弯曲工艺

摘要

由于轧机在轧制过程中的弹性变形，轧制的超高强度钢板的厚度边缘下降显着，因此厚度分布不均匀。测量具有这样的厚度分布的超高强度钢板的V形弯曲中的卸载前后的角度分布。弯曲角度由于下止点处的弯曲角度不足而不均匀地分布，并且在卸载期间会回弹。讨论了弯曲角度和厚度分布对薄边缘和厚边缘中的回弹的影响。通过使用橡胶垫用三片式模具压底来减小弯曲角度的分布。