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利用有限元软件进行仿真分析,基于Johnson-Cook本构模型和韧性损伤模型,模拟了钛合金波纹管液压成形过程。分析了液压大小、模具圆角尺寸和模片间距对波纹管液压成形的影响规律,并获得了优化的工艺参数。针对管材外径为Φ21.5 mm,壁厚为0.16 mm,成形后最大直径为Φ31.5 mm的钛合金管材,液压成形波纹管的最佳模片圆角半径为4t(t为管材壁厚)、液压大小为42 MPa、模片间距为8 mm。将仿真结果和实验结果进行对比发现,最大减薄率波峰处有2%~3%的差异,管端部有1%~2%的差异,这是由于假设仿真过程中全部采用润滑而实验过程中未必全部润滑,摩擦系数越大减薄率越大造成的,实验验证了仿真的准确性。
The finite element software was used to simulate and analyze the hydroforming process of titanium alloy bellows based on the Johnson-Cook constitutive model and the ductile damage model. The influence of hydraulic size, die fillet size and die spacing on the hydroforming of bellows was analyzed, and the optimized process parameters were obtained. For the pipe diameter Φ21.5 mm, wall thickness of 0.16 mm, the maximum diameter of Φ31.5 mm after forming the titanium alloy pipe, the best hydroformed bellows die radius of 4t (t is the pipe wall thickness ), Hydraulic size 42 MPa, die spacing 8 mm. The simulation results and experimental results were compared and found that the maximum reduction rate of 2% to 3% of the peak difference, the end of the tube 1% to 2% of the difference, which is due to the assumption that the entire simulation process using lubrication and experimental process May not be all lubrication, the larger the friction coefficient is caused by the greater the thinning rate, the experimental verification of the simulation accuracy.