基于Taguchi方法的激光喷丸强化工艺参量的优化研究

Optimization of laser peening parameters using Taguchi method

为了对激光喷丸强化的工艺参量进行全面评估,通过改变激光能量(A)、脉冲宽度(B)和光斑直径(C),对12mm厚的6061-T6铝合金板料进行模拟实验研究,旨在评价激光工艺参量对喷丸后残余应力的影响及彼此之间的交互作用。在Taguchi方法指导的基础上,采用ABAQUS有限元分析软件进行实验模拟,并运用MINITAB软件对数值模拟结果进行统计分析。结果表明,3个激光工艺参量对残余压应力都有着显著的影响,按照对残余压应力影响程度的大小进行排序,依次为光斑直径、脉冲宽度和激光能量。最佳的参量水平组合为A3B3C2,对应的表面残余应力大小为125MPa。

In order to make a comprehensive evaluation of process parameters of laser peening, a Taguchi experimental method was adopted here. Laser peening of the 12mm thick 6061-T6 aluminum alloy sheet was studied by changing the laser power,laser shot diameter and pulse width. The objective of the study was to assess the impact of laser parameters on residual compressive stress and the interaction of parameters. The finite element software ABAQUS was applied to simulate the laser peening process. The Taguchi method was used to formulate the experimental layout and establish the order of predominance among the identified critical parameters, and predict the optimal setting for each process parameter. The results obtained were analyzed using the software MINITAB. The results show that three parameters related to the magnitude of compressive residual stress imply different effects. Laser shot diameter ranks first, followed by pulse width and laser power. The best combination of levels is A3B3C3. The optimal result is confirmed with a superior ultimate surface residual compressive stress of 125MPa.