Approximately half of global steel production is dedicated for manufacturing sheets. Due to global warming, geopolitical instabilities and rising raw material costs, recycling sheet metal is increasingly important. Conventional recycling has inefficiencies, therefore improving material efficiency and adopting circular economy strategies is necessary to halve CO₂ emissions by 2050. This paper presents a review of sheet metal reuse techniques and introduces an innovative remanufacturing framework of curved steel sheet, with a special focus on the automotive sector and car-body panels. To support the framework presented, an experimental procedure on small-scale samples was carried out. The material tested was DC 0.4 steel parts (0.8 mm thick) characterized by different curvature radii. The material was reshaped and flattened under different conditions to understand the effect of the process variables onto the final quality of the remanufactured parts. The experiments showed that even parts with small curvatures can be flattened and reshaped with success. Lastly, to support the general remanufacturing framework presented, some flattening simulations of a large car-body are presented, revealing the importance of implementing a dwelling stage in the process and the advantage of performing such process with heated tools.

全球大约一半的钢铁产量专门用于制造板材。由于全球变暖、地缘政治不稳定和原材料成本上升，回收金属板材变得越来越重要。传统回收效率低下，因此必须提高材料效率并采用循环经济战略才能将 CO _2减半到 2050 年的排放量。本文回顾了钣金再利用技术，并介绍了一种创新的曲面钢板再制造框架，特别关注汽车行业和车身面板。为了支持提出的框架，对小规模样本进行了实验程序。测试的材料是具有不同曲率半径的 DC 0.4 钢部件（0.8 毫米厚）。在不同条件下对材料进行整形和压平，以了解工艺变量对再制造零件最终质量的影响。实验表明，即使是曲率很小的零件也可以成功地压平和重塑。最后，为了支持所提出的一般再制造框架，提出了一些大型车身的扁平化模拟，