基于有限元的AZ31镁合金手机壳成形工艺优化

Finite element based optimization of AZ31 magnesium alloy mobile phone case forming process

为解决镁合金手机壳冲压成形中的起皱、破裂等问题,改善冲压件的成形质量,获得最优的工艺参数组合,使用Dynaform软件对AZ31镁合金手机壳进行可成形性快速评估,结合起皱判断条件,发现AZ31镁合金手机壳容易发生起皱且起皱不可避免。采用以最大增厚率为评价指标的正交试验法,通过调节板料成形过程中压边力、冲压速度、摩擦系数和阻力系数等主要工艺参数得到不同的模拟结果。结果分析表明,各因素的影响大小为阻力系数>冲压速度>摩擦系数>压边力。模拟仿真得到质量最优的AZ31镁合金手机壳工艺参数组合:压边力为42 000 N、冲压速度为1 000 mm·s^(-1)、摩擦系数为0.125、阻力系数为0.2。研究可为冲压成形出质量优良的镁合金手机壳提供坚实的理论基础与可靠的数值依据。

In order to solve the problems of wrinkles and rupture in the stamping and forming of magnesium alloy mobile phone case and to improve the forming quality of its stamped parts,and to obtain the optimal combination of process parameters,Dynaform software was used to quickly evaluate the formability of AZ31 magnesium alloy mobile phone case,and combined with the wrinkling judgment conditions,it was found that AZ31 magnesium alloy mobile phone case was prone to wrinkling and wrinkling was inevitable.Using the orthogonal test method with the maximum thickening rate as the evaluation index,different simulation results were obtained by adjusting the main process parameters such as blank holder force,stamping speed,friction coefficient and resistance coefficient in the sheet metal forming process.The results show that the influence of each factor is the resistance coefficient>stamping speed>friction coefficient>holding force.The combination of process parameters of AZ31 magnesium alloy phone case with the best quality is obtained by simulation:the holding force is 42000 N,the stamping speed is 1000 mm·s^(-1),the friction coefficient is 0.125,and the resistance coefficient is 0.2.The research results provided a solid theoretical basis and reliable numerical basis for stamping the high-quality magnesium alloy mobile phone case.