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利用PAM-STAMP有限元仿真分析软件,对1.8 mm厚TA15钛合金板料深腔形零件在945℃下的超塑成形进行数值模拟,得到优化了的时间-压力曲线与零件的厚度分布图,并设计了相应的成形模具。根据仿真优化得到的时间-压力曲线对该零件进行超塑成形试验,用三维扫描设备扫描零件的外形得到点云数据,并用超声波测厚仪测量零件的厚度分布。将仿真结果与实际零件的三维外形和厚度进行对比发现,试验成形零件与仿真成形零件的外形误差在0.6 mm以内,而且厚度分布趋势一致,最大误差为17.98%;试验成形零件的最大减薄率为64.3%,满足设计要求,验证了有限元仿真模型的准确性。
The PAM-STAMP finite element simulation software was used to simulate the superplastic forming of deep cavity parts of 1.8 mm thick TA15 titanium alloy plate at 945 ℃. The optimized time-pressure curve and the thickness distribution of the parts were obtained. And designed the corresponding forming mold. According to the time-pressure curve obtained through the simulation optimization, the part was subjected to the superplastic forming test, and the shape of the part was scanned with a three-dimensional scanning device to obtain the point cloud data. The thickness distribution of the part was measured with an ultrasonic thickness gauge. The simulation results with the actual parts of the three-dimensional shape and thickness of the comparison found that the shape test parts and the simulation of the shape of the shape error of less than 0.6 mm, and the thickness distribution of the same trend, the maximum error of 17.98%; test the maximum reduction rate of forming parts Which is 64.3%, meets the design requirements and verifies the accuracy of the finite element simulation model.