Manufacturing of tailored aluminum parts by controlling the local cooling rates in a combined forming, quenching and hardening process (Tailor Quenched Forming)

通过控制成形、淬火和硬化组合工艺中的局部冷却速率来制造定制铝零件（定制淬火成型）

• 批准号: 456415464
• 负责人: Professorin Dr.-Ing. Marion Merklein
• 金额: --
• 依托单位: Institut für Metallformung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/456415464?language=en
• 关键词: Manufacturing; tailored; aluminum; parts; controlling

A common method for increasing passenger safety in vehicles is the use of high strength materials for structural safety-relevant parts. Due to the targeted adjustment of the mechanical properties, tailored components can be manufactured with locally adapted component strengths. In case of a crash, they have the ability to absorb or transfer the occurring energy to other regions of the vehicle. It is relevant that these components combine high-strength as well as ductile regions. Until now these components are only produced by modified press hardening operations of steel components. In association with the light-weight concept, a new opportunity to realize tailored components is the use of adapted, high-strength, hardenable aluminum components. During the forming process, the properties of previously solution-annealed components can be adjusted by simultaneous quenching and forming operations. The key influencing factor in quenching and forming operations is the cooling rate. In future, it will be possible to produce property-adapted structural components using high-strength aluminum alloys with the help of different local tool temperatures. Thermally coupled material models are necessary for the simulation of this forming process. Aim of this project is therefore at first the determination of the microstructural behavior of high-strength aluminum alloys as a function of cooling rate as well as mechanical stress states. The determined material properties will then transferred into a thermomechanically coupled material model and a precipitation simulation will be derived. This enables the transfer of the simultaneous forming and quenching operation into a FEM simulation. The influencing variables of the heat transfer between tool and component are investigated by experiments. Furthermore, the possibility of tool-internal hardening in comparison to conventional hardening in a furnace is investigated. The results are verified using a simplified demonstrator geometry.

提高车辆乘客安全性的常用方法是在结构安全相关部件中使用高强度材料。通过有针对性地调整机械性能，可以制造具有局部适应的部件强度的定制部件。在发生碰撞的情况下，它们能够吸收或将发生的能量转移到车辆的其他区域。相关的是，这些部件联合收割机高强度以及韧性区域。到目前为止，这些部件仅通过钢部件的改进的压制硬化操作来生产。与轻量化概念相关联，实现定制组件的新机会是使用适应的高强度可硬化铝组件。在成形过程中，可以通过同时进行淬火和成形操作来调整之前固溶退火部件的性能。淬火和成形操作中的关键影响因素是冷却速度。在未来，借助不同的局部工具温度，将有可能使用高强度铝合金生产性能适应的结构部件。热耦合的材料模型是必要的模拟这一成形过程。因此，该项目的目的是首先确定高强度铝合金的微观组织行为作为冷却速率以及机械应力状态的函数。然后将确定的材料特性转移到热机械耦合材料模型中，并导出沉淀模拟。这使得同时成形和淬火操作能够转移到FEM模拟中。通过实验研究了影响刀具与零件间传热的因素。此外，工具内部硬化的可能性相比，在炉中的常规硬化进行了研究。结果进行了验证，使用一个简化的演示几何。