Production of sheets by hot extrusion of aluminium chips

直接利用铝屑是替代传统挤压铸锭的一种节约资源的方法，因为节省了用于生产半成品的能源密集型初级成型工艺。在以往的研究工作中，铝屑直接挤压成实心型材的基础以及影响参数进行了研究。通过挤压开口型材、随后在一个工艺链中扩张和轧制，将铝屑直接加工成金属板材产品，以及通过成形工艺对板材进行进一步加工，这一点尚未得到研究。初步工作表明，可以通过铝屑的挤压工艺和轧制扩张来生产金属板材半成品。此外，基于芯片的片材的机械性能可以通过轧制工艺得到改善，使其与传统生产的铝板相当。因此，应该从根本上探索从铝屑生产铝板，通过工艺链挤压开口型材和轧制扩张，以及半成品金属板的进一步加工形成深冲产品。挤压和轧制参数影响芯片焊接，从而影响机械性能及其分散。这些也对铝板的可成形性有影响。各个工艺步骤的芯片焊接的物理关系可以使用分析模型并基于数值建模来估计。组件特性的测定显示了芯片组件的潜力及其可能的用途。通过直接回收铝芯片制成板材，可以扩大组件和产品的范围，开辟新的市场。此外，还节约了能源和资源，减少了CO2排放，从而降低了生产成本。

The direct utilization of aluminium chips represents a resource-saving alternative to the conventional extrusion of cast ingots, since the energy-intensive primary forming process for the production of semi-finished products is saved. In previous research work, the foundations for the direct processing of aluminium chips into solid profiles by extrusion as well as the influencing parameters were investigated. The direct processing of aluminium chips into sheet metal products by the extrusion of open profiles and subsequent expansion and rolling in a process chain as well as the further processing of the sheets by forming processes has not yet been investigated.Preliminary work shows that the production of sheet metal semi-finished products can be achieved through the extrusion process of aluminium chips and expansion through rolling. In addition, the mechanical properties of the chip-based sheets can be improved by the rolling process, making them comparable to conventionally produced aluminium sheets. The production of aluminium sheets from aluminium chips through the process chain extrusion of open profiles and expansion by rolling and the forming of further processing of semi-finished sheet metal to deep drawing products should therefore be fundamentally explored. The extrusion and rolling parameters influence the chip welding and thus the mechanical properties and their scattering. These also have an influence on the formability of aluminium sheets. The physical relationships of chip welding of the individual process steps can be estimated using an analytical model and based on numerical modelling. The determination of the component properties shows the potential of the chip-based components as well as their possible uses.By directly recycling aluminium chips into sheets, the range of components and products can be expanded, opening up new markets. In addition, energy and resources are saved and CO2 emissions are reduced, which leads to a reduction in production costs.