【作者】 王梦寒； 王晋强； 李志； 王周田；

【Author】 WANG Menghan;WANG Jinqiang;LI Zhi;WANG Zhoutian;Chongqing University;

【机构】 重庆大学； 中国第二重型机械集团德阳万航模锻有限责任公司；

【摘要】 高温钛合金抗变形能力大,在成形大型盘类锻件的过程中,经常出现充不满、成形载荷大、变形不均匀等缺陷。因此,首先利用有限元模拟获得最优的预锻坯高径比,随后结合正交试验法、BP神经网络和遗传算法在最优高径比的基础上对预锻件进行局部优化,得出最优的预锻坯。结果表明,中心区域带凹坑的预锻坯可以有效的减小锻件中心的大变形区,且制坯所采用的锥形砧的尺寸对锻件的变形量影响很大;预锻件高度为250mm,锥形砧小头半径、凸台高度、大头半径=100mm时,终锻件的成形载荷为312MN。优化后成形载荷明显降低,未充满缺陷消除,同时锻件的变形均匀性得到改善,整体变形量控制在了40%-60%之内。更多还原

【Abstract】 Due to the high resistance to deformation of high temperature titanium alloy, somedefectsuchas insufficient filling, high forming load and uneven deformation are usually existing in the forming process of large-scale blisk. Therefore, the finite element simulation is used to obtain the best Height-to-diameter ratio of preform shape. And then the orthogonal test method, BP neural network and genetic algorithm are used to optimize the preform part based on the optimal height-to-diameter ratio, and the optimal preform shape is obtained. The preform shape with a pits in the central area can effectively reduce the large deformation zone in the center of the forging, and the size of the tapered anvil used in the billet has a great influence on the deformation of the forging. The results show that when the height of the preform is 250 mm, the radius of the small head of the cone is x1 = 80 mm, the height of the boss is x2 = 60 mm and the big head of the radius is x3 = 100 mm, the forming load of the final forging is 312 MN. The forming load is obviously reduced and the defect of insufficient filling has been eliminated. In addition, the uniformity of deformation is improved and the whole deformation of the forging is controlled in 40%-60%.更多还原