Influence of cavity pressure on hydrodynamic deep drawing of aluminum alloy rectangular box with wide flange
Influence of cavity pressure on hydrodynamic deep drawing of aluminum alloy rectangular box with wide flange
复制标题
DOI：
10.1016/j.ijmecsci.2013.10.012
复制
发表时间：
2013-12
影响因子：
7.3
通讯作者：
B. Meng;M. Wan;Sheng Yuan;Xudong Xu;Jie Liu;Zhenbiao Huang
中科院分区：
文献类型：
--
作者：
B. Meng;M. Wan;Sheng Yuan;Xudong Xu;Jie Liu;Zhenbiao Huang
超宽法兰箱式件的传统深拉深工艺采用多道退火工艺，存在表面质量差、制造周期长、成本高、成品率低等问题。针对多阶段拉深过程中存在的问题，提出了流体动力拉深方法，其中型腔压力的加载路径是直接关系到产品质量的关键参数之一。通过理论分析、数值模拟和实验，探讨了型腔压力对成形质量和精度的影响，并通过对角区和直区进行应力分析，建立了型腔压力的工艺窗口。同时，研究了不同预胀形压力、分段行程和最大压力下壁厚分布。通过工艺试验验证了合理的加载路径。结果表明，适当控制型腔压力有利于有效提高铝合金的拉拔性能，可以用一步式HDD工艺代替由3道拉拔工序和2道中间退火工序组成的传统拉拔工艺。
The multi-stage deep drawing process had been traditionally adopted for the box part with super wide flange using multiple annealing procedures with problems of poor surface quality, long manufacturing cycle, high cost and low yield. The hydrodynamic deep drawing (HDD) method was suggested to solve these issues during the multi-stage drawing process, in which the loading path of cavity pressure was one of the key parameters immediately related to the product's quality. The effects of cavity pressure on forming quality and precision were explored according to theoretical analysis, numerical simulations and experiments, and the process window of cavity pressure was established through stress analysis of the corner and straight regions. Meanwhile, wall thickness distributions were investigated with different parameters, including pre-bulging pressure, piecewise stroke and maximum pressure. Furthermore, the reasonable loading path was validated by process experiments. The results indicate that the proper control of cavity pressure will be beneficial in improving the drawability of aluminum alloys effectively, and the conventional drawing process consisting of three drawing operations and two intermediate anneals can be replaced by the one-step HDD process.