摘要
针对波纹管压弯和焊接复合成形压痕严重和可靠性不高的现象,提出了波纹管液压成形方法。阐述了波纹管液压成形原理,建立了波纹管液压成形有限元模型,对不同压强条件下波纹管的成形状态进行了数值模拟,结果表明:模具圆角半径为5mm时,波纹管完全贴模的压强为40MPa,该条件下波纹管的厚度分布均匀,最大减薄率为10%。采用波纹管液压成形机对旋压管坯进行了液压成形实验,结果表明:成形压强为40MPa时,波纹管完全贴模,壁厚分布较均匀,最小壁厚满足设计要求。以波纹管各波区的厚度减薄率为对象,对波纹管液压成形数值模拟和成形实验进行了对比分析,结果表明:数值模拟和成形实验之间的最大厚度减薄率偏差仅为1.4%,对比结果验证了有限元模型的正确性。
The bellows hydroforming method was proposed to avoid the indentation and improve the responsibility of bellows formed by ribbon and welding. The principle of bellows hydroforming was elaborated, the finite element model of bellows hydroforming was set up, and numerical simulations of forming status for bellows with different forming pressure were carried out. The results show that the forming pressure is 40 MPa of bellows match the die when the radio of die is 5mm, the thickness of bellows is uniform and maximum thickness thinning radio is 10%. The hydroforming experiment of spinning tube were carried out on the hydroforming machine of bellows. the experimental results show that the bellows match the die adequately when the pressure is 40 MPa, and the minimum wall thickness meets the design requirement. The contrast of thickness thinning ratio of bellows between numerical simulation and forming experiment are analyzed. The results show that the deviation of maximum thickness thinning ratio is only 1.4%, which verified the correctness of finite element model of bellows hydroforming.
出处
《航天制造技术》
2015年第2期23-25,30,共4页
Aerospace Manufacturing Technology
关键词
波纹管
液压成形
厚度减薄率
数值模拟
bellows
hydroforming
thickness thinning ratio
numerical simulation
作者简介
彭赫力（1986-），博士，材料加工工程专业；研究方向：钣金柔性成形。
