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通过数值模拟的方法,对5A06铝合金内凹底筒形件充液预胀成形工艺进行了研究,并对不同预胀压力和液室压力下零件成形的影响进行了成形模拟。结果表明,采用合理匹配的初始预胀压力和液室压力加载路径,可有效地降低板料成形时的径向拉应力,抑制零件内凹底部的过度减薄,可以一次成形较高质量的内凹底筒形件。通过试验,对拉深比为2.2的内凹底筒形件的成形进行了研究,并与模拟结果进行了对比,分析了试验中出现的成形缺陷。试验结果均与模拟结果一致,验证了模拟的可靠性。
Through the numerical simulation method, the forming process of the 5A06 aluminum alloy inner cylinder with concave bottom is studied, and the influence of the different pre-swelling pressure and the pressure of the liquid chamber on the forming of the part is simulated. The results show that the reasonably matched initial pre-bulging pressure and liquid chamber pressure loading path can effectively reduce the radial tensile stress during sheet forming, and suppress the over-thinning of the concave bottom of the sheet, thus forming a higher-quality inner Concave cylinder. Through the experiment, the forming of the concave bottom cylindrical part with the draw ratio of 2.2 was studied. Compared with the simulation results, the forming defects appeared in the experiment were analyzed. The test results are consistent with the simulation results, verifying the reliability of the simulation.