Development and Investigation of Mechanical Properties of Hot Forging Dies by Bulk Forming and Thermomechanical Treatment

本研究项目旨在研究锻模的热机械雕刻与所产生的强度性能之间的关系。该提案的基本假设是，一方面，由于应力导向的颗粒流，与其他传统制造工艺相比，工具雕刻的轮毂在工具耐用性方面具有显著优势，这取决于雕刻几何形状。另一方面，由于奥氏体形变(奥氏体形变)对马氏体组织的影响，认为在热加工钢中通过奥氏体形变(奥氏体形变)可以获得技术优势。为了识别和评估批量成形热锻模的潜力，应确定适合生产的工艺参数，以提高耐久性为目标。比较力学试验和显微组织的光学分析应以定量的方式表明，通过奥氏体化可以提高操作强度的程度。此外，成形生产的锻模应与切割和随后回火生产的模具相对。评估应以运行条件下的机械强度验证为基础。工艺设计的客观标准是至少保持与传统制造的工具相比的机械和热稳定性。利用所获得的知识，可以优化热加工刀具的生产，从而提高刀具寿命。通过考虑微观结构的各向异性和热机械诱导的强度增加，将获得关于改进工具性能的基本知识。

This research project aims to investigate the relationship between thermo-mechanically generated engravings of forging dies and the resulting strength properties. The underlying assumptions for the proposal are on the one hand, that the hubbing of tool engravings can have significant advantages in terms of the tool durability compared to other conventional manufacturing processes depending on the engraving geometry due to a stress-oriented grain flow. On the other hand, it is assumed that a technological advantage can be achieved through the austenite forming (ausforming) in a hot working steel due to their influence on the martensitic microstructure. To identify and assess the potential of bulk formed hot forging tools, suitable process parameters for the production shall be identified with the goal of increasing the durability. Comparative mechanical testing and optical analysis of microstructure shall indicate in quantitative way, to what extent the operating strength can be increased by ausforming. Further, the forging dies produced by forming shall be opposed with dies produced by cutting and subsequent tempering. The assessment shall be based on the verification of mechanical strength under operating conditions. An objective criterion for the process design is that the mechanical and thermal stability compared to the conventionally manufactured tools is at least maintained. With the acquired knowledge, the production of hot working tools could be optimized and thus the tool life increased. Basic knowledge in terms of improved tool properties will be obtained by taking into account anisotropy of microstructure and thermo-mechanically induced increase in strength.