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Energy release rate based approach for the wear of punches in precision blanking of high strength steel

机译:基于能量释放率的高强度钢精密冲裁中冲头磨损的方法

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摘要

Punch wear is a major issue in the blanking of high strength steel (HSS) sheets. To study wear physics, a blanking test with tight side clearances was implemented, and the results compared with numerical simulations with appropriately calibrated critical damage value. Based on observations of worn punches, wear angle was found to adequately represent changing geometry of the cutting edge. Using modified geometries, burr formation, stress-state at the punch and load-displacement curves are investigated. Punch wear and shear crack mechanics are found to strongly relate to the changes in the load-displacement curve, and the release rate of punching energy.
机译:冲头磨损是高强度钢板(HSS)落料的主要问题。为了研究磨损物理,实施了具有紧密侧面间隙的落料试验,并将结果与​​具有适当校准的临界损伤值的数值模拟进行了比较。根据对冲头磨损的观察,发现磨损角度足以代表切削刃的变化几何形状。使用修改后的几何形状,研究了毛刺的形成,冲头处的应力状态和载荷-位移曲线。发现冲头磨损和剪切裂纹力学与载荷-位移曲线的变化以及冲头能量的释放速率密切相关。

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