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

通过整体成形和形变热处理开发和研究热锻模具的机械性能

• 批准号: 318628894
• 负责人: Professor Dr.-Ing. Bernd-Arno Behrens
• 金额: --
• 依托单位: Institut für Umformtechnik und Umformmaschinen (IFUM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/318628894?language=en
• 关键词: Development; Investigation; Mechanical; Properties; Hot

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.

本研究旨在探讨锻模热机械加工产生的雕刻与强度特性之间的关系。该提议的基本假设是，一方面，与其他传统制造工艺相比，工具雕刻的轮毂加工在工具耐用性方面具有显著优势，这取决于雕刻几何形状，这是由于应力导向的晶粒流动。另一方面，据推测，由于它们对马氏体显微组织的影响，可以通过热加工钢中的奥氏体形成（奥氏体形变）来实现技术优势。为了识别和评估整体成型热锻工具的潜力，应确定合适的生产工艺参数，以提高耐用性。对比机械试验和显微组织的光学分析应定量地表明，形变热处理可在多大程度上提高操作强度。此外，通过成形生产的锻模应与通过切割和随后的回火生产的锻模相对。评估应基于操作条件下的机械强度验证。工艺设计的客观标准是至少保持与常规制造的工具相比的机械和热稳定性。利用所获得的知识，可以优化热加工工具的生产，从而延长工具寿命。通过考虑显微组织的各向异性和热机械引起的强度增加，将获得改善工具性能方面的基本知识。