Li Yang, Li Ya-Nan, Li Xi-Wu, Zhu Kai, Zhang Yong-An, Li Zhi-Hui, Yan Hong-Wei, Wen Kai
State Key Laboratory of Nonferrous Metals and Processes, GRINM Group Co., Ltd., Beijing 100088, China.
GRIMAT Engineering Institute Co., Ltd., Beijing 101407, China.
Materials (Basel). 2023 Mar 1;16(5):2033. doi: 10.3390/ma16052033.
In this paper, the effects of material removal strategies and initial stress states on the machining deformation of aluminum alloy plates were investigated through a combination of finite element simulation and experiments. We developed different machining strategies described by Tm+Bn, which removal m mm materials form top and n mm materials from the bottom of the plate. The results demonstrate that the maximum deformation of structural components with the T10+B0 machining strategy could reach 1.94 mm, whereas with the T3+B7 machining strategy was only 0.065 mm, decreasing by more than 95%. The asymmetric initial stress state had a significant impact on the machining deformation of the thick plate. The machined deformation of thick plates increased with the increase in the initial stress state. The concavity of the thick plates changed with the T3+B7 machining strategy due to the asymmetry of the stress level. The deformation of frame parts was smaller when the frame opening was facing the high-stress level surface during machining than when it was facing the low-stress level. Moreover, the modeling results for the stress state and machining deformation were accurate and in good accordance with the experimental findings.
本文通过有限元模拟与实验相结合的方法，研究了材料去除策略和初始应力状态对铝合金板材加工变形的影响。我们开发了以Tm+Bn描述的不同加工策略，即从板材顶部去除m毫米材料，从底部去除n毫米材料。结果表明，采用T10+B0加工策略时结构部件的最大变形可达1.94毫米，而采用T3+B7加工策略时仅为0.065毫米，减少了95%以上。非对称初始应力状态对厚板的加工变形有显著影响。厚板的加工变形随初始应力状态的增加而增大。由于应力水平的不对称性，采用T3+B7加工策略时厚板的凹度发生了变化。加工过程中，框架开口面对高应力水平表面时框架部件的变形比面对低应力水平时小。此外，应力状态和加工变形的建模结果准确，与实验结果吻合良好。
