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利用所提出的拓扑优化方法,对复杂形状叶片锻造的预成形形状进行了优化设计。详细给出了该方法在三维模式下的优化策略、优化目标、单元增删准则、几何模型处理等关键技术。以合理精简毛坯、提高模腔充填性为综合优化目标,利用自行开发的优化程序,经过十余次的优化迭代,获得了理论上的优化结果。研制了叶片锻造模具,对优化后的预成形件进行了锻造成形实验;利用激光测量设备采集了叶片锻件型面的几何数据,并与数值模拟结果进行了比对。对预成形件制备工艺的可行性进行了详细讨论。结果表明:基于拓扑优化方法所获得的叶片预成形设计结果较为理想。
By using the proposed topology optimization method, the preform shape of the complex shape blade forging is optimized. The key technologies of this method, such as optimization strategy, optimization goal, unit addition and deletion criterion and geometric model processing are given in detail. In order to rationalize the rough, improve the cavity filling for the overall optimization objectives, using self-developed optimization program, after more than ten times of optimization iteration, obtained the theoretical optimization results. The blade forging mold was developed and the forging forming experiment was carried out on the optimized preform. The geometrical data of the blade forging surface was collected by the laser measuring equipment and compared with the numerical simulation results. The feasibility of preform preparation process is discussed in detail. The results show that the results of leaf preform design based on topology optimization method are ideal.