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充液拉深(HDD)技术是薄壁零件成形的一种有效方法。针对难成形、复杂薄壁结构的某型发动机高温合金板材零件,通过分析锥面自由悬空区的起皱失稳现象,设计了多道次充液拉深结合刚模成形的技术方案,并建立了有限元分析模型。基于有限元模拟和工艺验证试验,研究了预成形高度和终成形液室压力等关键工艺参数对零件最终成形质量的影响,探讨了成形过程中起皱、破裂的失效形式,提出了优化的工艺参数。结果表明,提出的工艺方法可实现复杂薄壁、大拉深比的高温合金零件的整体精确成形,采用优化的预成形高度和终成形液室压力可获得壁厚分布均匀、成形质量较好的零件。
Liquid-filled drawing (HDD) technology is an effective method of forming thin-walled parts. Aiming at a certain type of engine superalloy sheet metal part which is difficult to be formed and complicated thin-walled structure, the technical scheme of multi-pass liquid-filled drawing and rigid mold forming is designed and analyzed by analyzing the wrinkling and instability phenomenon of the free-hanging cone area. Finite element analysis model. Based on the finite element simulation and the process verification test, the influence of the key process parameters such as the pre-forming height and the pressure in the final forming chamber on the final forming quality of the part was studied. The failure modes of the wrinkling and rupturing in the forming process were discussed. Process parameters. The results show that the proposed method can realize the precise forming of the high-temperature alloy parts with complex thin walls and large depth-to-depth ratio. The optimized pre-forming height and the pressure of the final forming chamber can achieve uniform wall thickness distribution and good forming quality Parts.