High-performance aluminum alloy is light, has high strength, but is very difficult to be formed. In the forming process of aluminum alloy parts with special-shaped bottom, there are defects such as poor fittability accuracy, instability, and cracking at the complex bottom, and the forming accuracy is an important performance index to characterize the forming quality. In this paper, a precision warm hydroforming scheme of pre-bulging and deep drawing is designed, and a method of applying independent circumferential pressure on the periphery of the flange in the later stage of pre-bulging is proposed to maintain the shape of the bottom and improve the fittability accuracy. The effects of temperature difference and independent circumferential pressure on the wall thickness and fittability of the part are studied. At the same time, response surface method is used to study the interaction among pre-bulging pressure, liquid chamber pressure, and circumferential pressure, and the optimal forming conditions are obtained after optimization and compared with the test piece. The results show that independent circumferential pressure can significantly improve the ability of the bottom of the pre-bulged part to maintain the acquired shape, and the temperature difference can effectively improve the plasticity of the sheet, the depth of drawing, and the quality of the part. After optimization by response surface method, the minimum wall thickness of the part is 0.8013 mm and the fittability is 94.2%. The forming quality parameters of the test piece are in good agreement with the numerical simulation parts, which indicates that this simulation can effectively predict forming situation of the part, and provides scientific guidance for precision forming of complex-shaped bottom parts.

高性能铝合金重量轻，强度高，但很难成型。在具有异型底部的铝合金零件的成形过程中，存在装配精度差，不稳定性和复杂底部开裂等缺陷，成形精度是表征成形质量的重要性能指标。本文设计了一种精密的预鼓胀和深拉成形的温暖液压成形方案，并提出了一种在预鼓胀的后期对凸缘的周边施加独立的圆周压力的方法，以保持底部的形状。并提高拟合精度。研究了温差和独立的圆周压力对零件壁厚和装配性的影响。同时，用响应面法研究了预鼓胀压力，液腔压力和周向压力之间的相互作用，并在优化后获得了最佳成形条件，并与试件进行了比较。结果表明，独立的圆周压力可以显着提高预鼓鼓形零件底部保持所获得的形状的能力，而温度差可以有效地提高板材的可塑性，拉深深度和板材的质量。部分。通过响应面法优化后，零件的最小壁厚为0.8013毫米，可装配性为94.2％。试件的成型质量参数与数值模拟部分吻合较好，