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为探究温度在改善6061铝合金精冲质量时的作用,通过单向拉伸试验获取6061铝合金在不同温度条件下的应力-应变曲线,然后结合单拉试验和有限元模拟,确立了断裂阈值与温度的关系,并将温度耦合到Normalized Cock Croft-Latham准则中,利用有限元模拟软件分析对比不同温度条件下6061铝合金精冲过程,最后利用精冲实验对模拟结果进行验证。结果表明,升温延缓了断裂的产生和扩展,25℃时精冲剪切区几乎完全断裂,而175℃时剪切区裂纹仅在凹模刃口附近产生,凸模附近尚未产生裂纹;随着温度的升高,精冲件断面质量改善,光亮带厚度从25℃时的1.53 mm上升到175℃时的3.02 mm,断裂带厚度从25℃时的3.68 mm下降到175℃时的2.06 mm。
In order to explore the effect of temperature on the quality improvement of 6061 aluminum alloy, the stress-strain curve of 6061 aluminum alloy under different temperature conditions was obtained by uniaxial tensile test. Then the fracture threshold And the temperature was coupled to the Normalized Cock Croft-Latham criterion. Finite element simulation software was used to analyze and compare the fine blanking process of 6061 aluminum alloy under different temperature conditions. Finally, the simulation results were verified by fine blanking experiments. The results show that the temperature rise slowed down the generation and expansion of the fracture, and the shear zone in the fine blanking almost completely ruptured at 25 ℃. However, the crack in the shear zone was only produced near the die edge at 175 ℃ and no crack was observed nearby the punch. When the temperature rises, the section quality of the fine blanking part improves. The thickness of the bright part rises from 1.53 mm at 25 ° C to 3.02 mm at 175 ° C. The thickness of the fracture zone decreases from 3.68 mm at 25 ° C to 2.06 mm at 175 ° C.