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利用有限元软件MSC.Marc2010对钛合金盒形件超塑成形过程进行了有限元模拟,控制目标应变速率,得到优化的压力-时间曲线,并据此进行实验研究,沿实验曲线分别加载至6个不同的标定压力值(分别为0.5,1.0,1.5,2.0,2.3和2.5MPa)得到成形过程中的零件。测量6个实验零件的外形轮廓和厚度,并分别与相对应的模拟结果进行对比,验证实验与模拟的一致性,并分析整个成形过程中的材料流动规律,得出在自由胀形、底部贴模、充填圆角3阶段盒形件不同区域的应力、应变和变薄率分布,为复杂零件的超塑成形工艺的制定奠定了一定的理论基础。
Finite element simulation was performed on the superplastic forming process of titanium alloy box parts by using finite element software MSC.Marc2010. The target strain rate was controlled and the optimized pressure-time curve was obtained. Experimental studies were carried out according to the experimental results, and the experimental curves were loaded to 6 A number of different calibration pressures (0.5, 1.0, 1.5, 2.0, 2.3 and 2.5 MPa, respectively) resulted in parts during the forming process. The contour and thickness of the six experimental parts were measured and compared with the corresponding simulation results to verify the consistency of the experiment and simulation and to analyze the material flow law throughout the forming process, The stress, strain and thinning rate distribution in different regions of the mold, filling fillet 3-stage box form laid a theoretical foundation for the formulation of the superplastic forming process of complex parts.