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针对仿生蛋形耐压壳加工精度要求高、变形不可控以及应变分布不均等问题，提出采用颗粒介质辅助成形代替刚性模成形，用以提高其塑性变形的成形质量和几何精度，改善应变分布。对比了刚性模成形和颗粒介质成形的成形质量，研究分析了冲压速度(100、200、300、400和500 mm·min-1)和润滑介质(润滑油、润滑脂和薄膜)的耦合机制对塑性变形程度和应变分布的影响，并通过贴模程度、应变分布和减薄率评判了成形方法的优劣，通过数值模拟和实验结果对比分析验证了数值模型以及最佳工艺参数的准确性。结果表明：颗粒介质成形相比刚性模成形的蛋形尖端塑性加工精度和几何精度更好；最优工艺参数为颗粒介质成形，其中冲压速度为200 mm·min-1,润滑介质选择薄膜。
Abstract：To address the challenges of high processing precision requirements, uncontrollable deformation and uneven strain distribution of bionic egg-shaped pressure-resistant shells, a granular medium-assisted forming method was proposed to replace rigid-die forming to improve the forming quality and geometric accuracy of plastic deformation, as well as to achieve a more uniform strain distribution. The forming quality of rigid-die forming and granular medium forming was compared, and the coupling effects of stamping speed(100,200,300,400 and 500 mm·min-1)and lubricant medium(lubricant oil, lubricant grease and film) on the degree of plastic deformation and strain distribution were investigated and analyzed. The performance of the forming methods was evaluated based on die-fitting degree, strain distribution and thinning rate. The accuracy of the numerical model and the optimal process parameters were validated through a comparative analysis of numerical simulation and experimental results. The results show that granular medium forming provides higher plastic processing precision and better geometric accuracy at the shell′s tip than rigid-die forming. The optimal process parameters are determined as granular medium forming, with stamping speed of 200 mm·min-1 and film lubricant.
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基本信息:
中图分类号:U671;TG306
引用信息:
[1]孙志莹,成伟杰,成慧明,等.仿生蛋形尖端塑性成形工艺及成形质量研究[J].塑性工程学报,2026,33(08):80-86.
基金信息:
国家自然科学基金资助项目(52205372)
2026-08-21
2026-08-21
2026-08-21