Application and analysis of adiabatic blanking

绝热下料是分离高强度材料的一种有效方法。与传统的剪切冲裁相比，冲床速度增加了20倍。由于工艺时间短，分离过程中产生的热量无法传递，导致局部温度超过800℃而产生强烈的热软化。由此产生的冲裁表面在几何精度、粗糙度和无毛刺方面表现出高质量。该项目的目的之一是从根本上研究预变形对局部化发展和微观结构的影响。首次研究了绝热冲裁表面的边缘裂纹敏感性。为此，进行了扩孔试验和修正剪切试验。此外，研究了切削刃作为功能表面的应用。因此，确定了耐腐蚀性和硬度。分析了材料力学性能对绝热剪切带传播速度和几何形状的影响，以及由平面应变装置精确调节的下料前变形对绝热剪切带传播速度和几何形状的影响。通过设定压力淬火钢22MnB5的硬度，可以确定强度和组织对绝热过程的影响。所得的微观结构和所需的分离能表征了不同工艺参数的结果。这一分析产生的信息，绝热落料后，先前的成形过程的适用性。

Adiabatic blanking is an efficient process to separate high-strength materials. Punch velocities are increased by a factor of 20 compared to conventional shear blanking. Due to the short process time, the heat generated during the separation operation cannot be transferred, resulting in a strong thermal softening induced by local temperatures of over 800 °C. The resulting blanked surfaces exhibit high quality in terms of geometrical accuracy, roughness and absence of burr.One aim of the project is to investigate the influence of pre-deformation on the development and microstructure of the localization fundamentally. The edge crack sensitivity of adiabatically blanked surfaces is investigated for the first time. To this end, hole expansion tests and modified shear tests are conducted. Moreover, the cutting edge is investigated with respect to the application as functional surface. Hence, the corrosion resistance and hardness are determined.The influence of mechanical material properties as well as the influence of deformation prior to the blanking process, which is adjusted accurately by a plane-strain-device, on the propagation velocity and geometry of the adiabatic shear band is analysed.By setting the hardness of press hardening steel 22MnB5, the influence of strength as well as the microstructure on the adiabatic process can be determined. The resulting microstructure and the required separation energy characterise the result of different process parameters. This analysis yields information on the suitability of adiabatic blanking after a previous forming process.