Investigation on the temperature distribution in the shearing zone during sheet metal blanking to improve the quality of blanking simulation with material separation

研究板材冲裁过程中剪切区的温度分布，以提高材料分离冲裁模拟的质量

• 批准号: 56276709
• 负责人: Professor Dr.-Ing. Hartmut Hoffmann
• 金额: --
• 依托单位: Lehrstuhl für Umformtechnik und Gießereiwesen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/56276709?language=en
• 关键词: Investigation; temperature; distribution; shearing; zone

The crack initiation and propagation is of crucial importance for the FE-simulation of shear cutting processes. To model the fracture behavior during the shear cutting process, several fracture criteria were introduced. All fracture criteria are based upon the assumption that the separation of the material is initiated at a material specific and constant damage value. However, examinations have shown that the damage value is not really a matter constant. A variation of shear cutting parameters requires an adjustment of the value. Consequently the blanked sheet metal surface cant be simulated with adequate quality in advance. It is always necessary to adjust the simulation with practical experiments.There is a divergence of opinions regarding the extent of the temperature rise in the shearing zone during sheet metal blanking in literature. Many authors assume that the temperature rise during the blanking process is not significant. In contrast other scientists write about very high temperatures up to 750°C. Assuming such high temperatures and at the same time neglecting the temperature in the process view is incorrect.Due to the importance of the temperature it is attempted to measure the resulting temperature distribution during the blanking process on the cutting edge of the blanking punch in this project. Based on these results, the temperature influence should be embedded in the FE-simulation of shear cutting processes and the corresponding damage criteria to achieve a fracture initiation and propagation close to reality.

裂纹启动和传播对于剪切切割过程的Fe模拟至关重要。为了模拟剪切切割过程中的断裂行为，引入了几个断裂标准。所有断裂标准均基于以下假设：材料的分离是在材料特异性且恒定的损伤值中启动的。但是，考试表明，损害值并不是真正常数的。剪切切割参数的变化需要调整值。因此，无法提前以足够的质量模拟遮挡的钣金表面。始终有必要通过实际实验调整模拟。关于文献中金属薄板毛坯期间，剪切区温度升高的程度存在分歧。许多作者认为，在空白过程中的温度升高并不显着。相比之下，其他科学家写的是高度高达750°C的高温。假设这种高温并同时忽略了过程视图中的温度是不正确的。对于温度的重要性而言，它试图测量该项目中空白冲刺的凹痕过程中所产生的温度分布。基于这些结果，应将温度影响嵌入剪切切割过程的Fe仿真中，以及相应的损害标准，以实现接近现实的断裂开始和传播。