镁合金笔记本外壳温冲成形工艺参数对损伤因子的影响
Effect of Process Parameters on Damage Factor During Warm Drawing of Magnesium Alloy Notebook PC Shell
权国政， 王凤彪， 周一俊， 周 杰
点击：3008次 下载：0次
作者单位：重庆大学 材料科学与工程学院，重庆 400044
中文关键字：镁合金；笔记本；最大损伤因子；破裂
英文关键字： magnesium alloy; notebook PC; maximum damage factor; crack
中文摘要：引入Cockroft-Lathem韧性损伤准则，通过应用有限元技术模拟多组镁合金笔记本外壳薄板温冲成形方案的成形过程，同时计算损伤因子及分布，从而建立了一系列工艺参数对最大损伤因子的影响规律，并锁定两个角部为拉深成形最易破裂的区域。以追求损伤因子最小为目标得出了优化的工艺参数：成形温度250 ℃，压机速度4 mm/s，摩擦因子0.09，压边力0.7 MPa，凹模圆角半径5.1 mm，凸凹模间隙1.15 mm。
英文摘要：Cockroft-Lathem ductile damage criteria was introduced, a series of warm drawing processes for magnesium alloy notebook PC shell sheet were simulated by finite element method, the damage factors and their distribution were calculated. Then the effect of a series of forming parameters on the maximum damage factor was analyzed and the crack regions at the piece's corners were identified. Based on the objective of minimizing the damage factor, a set of optimal parameters were achieved: forming temperature 250 ℃, press speed 4 mm/s, friction factor 0.09, radius of die 5.1 mm, clearance between punch and die 1.15 mm.