Process combination of combined deep drawing and cold forging

在第一个资助期内，研究表明深拉和冷锻相结合的工艺可以用于生产混合轴，由轻质芯和高强度钢壳组成。第二个资助期的目标是对过程进行调整，以增加可能的组件范围，并提高复合伙伴之间的联系质量。穿孔圆板的使用应该将孔扩展和向前挤压的过程联系起来，以便能够涂覆任意轴区域。除此之外，多级深拉深用于生产在其整个长度上覆盖高强度钢的轴。为了提高基本过程中产生的结合强度及其变化，研究了反压力的应用，以进一步扩大过程窗口。为了进一步提高轻量化潜力（例如镁作为核心材料），研究了材料组合的变化。由于镁的六方晶格结构，镁及其合金很难形成。在这方面，将研究由周围高强度壳体产生的静水压力在多大程度上有助于接头成形过程。最后，研究了新材料组合的新特性，例如使用铜作为钢壳来增加导电性。

In the first funding period, it was shown that the process of combined deep-drawing and cold forging can be used to produce hybrid shafts, consisting of a lightweight core and a high strength steel shell.The goals of the second funding period is the adaptation of the process in order to increase the possible component spectrum, as well as to increase the bond quality between the composite partners. The usage of perforated circular sheets is supposed to link the processes of hole expansion and forward extrusion, in order to enable coating of arbitrary shaft regions. In addition to this, multi-stage deep-drawing is used to produce shafts that are covered with a high strength steel over its complete length. In order to increase the resulting bond strengths in the basic process as well as its variations, the application of a counter-pressure is investigated in order to further enlarge the process window.A variation of the material combinations is investigated in order to further increase the lightweight potential (e. g. magnesium as a core material). Due to the hexagonal lattice structure, magnesium and its alloys are difficult to form. In this regard it will be investigated to what extent the hydrostatic pressure resulting from the surrounding high strength shell will help in the joint forming process. Lastly, new features are investigated by combination of new material combinations, e. g. the use of copper as a steel shell for increasing the electrical conductivity.