目的 设计一种新型扇式排布的多点柔性拉弯模具,并为其头体设计提供理论支持。方法 基于平行阵列和扇式阵列下拉弯模具的受力特性分析,提出了一种新的扇式排布设计方案。通过贴合假设,建立了头体半径与型材成形半径、贴合间隙及头体宽度之间的关系;同时基于变形阶差假设,得到了贴合弦长、成形半径、贴合间隙和变形阶差之间的理论关系。进一步地,针对不同成形工况需求,构建了完整的头体设计流程,并采用有限元方法对比分析了多点接触成形与全接触成形的效果。结果 所建立的关系式为头体设计提供了坚实的理论支撑,且有限元分析结果表明,扇式多点柔性拉弯模具展现出优异的成形性能,其效果与全接触成形相当。结论 扇式多点柔性拉弯模具具备良好的多工况适应性和显著的应用前景,具有重要的工程价值。
Abstract
The work aims to design a novel multi-point flexible stretch-bending die with a fan-shaped arrangement and provide theoretical support for its punch head design. A new design scheme based on the fan-shaped arrangement was proposed, following an analysis on the mechanical characteristics of dies with both parallel and fan-shaped arrays. Utilizing a conformity assumption, a theoretical model correlating the die head radius with the profile's target radius, conformity gap, and head width was developed. Concurrently, based on a deformation step difference assumption, the theoretical relationship among the conformity chord length, target radius, conformity gap, and deformation step difference was derived. Furthermore, a comprehensive die head design methodology was established to meet the requirements of various forming conditions. The finite element method (FEM) was employed to compare the forming effectiveness of the multi-point contact scheme against the conventional full-contact forming. The derived theoretical relationships provide a solid foundation for the design of the die head. Finite element analysis confirmed that the fan-shaped multi-point flexible die stretch-bending exhibited excellent forming performance, achieving a forming quality comparable to that of full-contact forming. In conclusion, the proposed fan-shaped multi-point flexible stretch-bending die demonstrates strong adaptability to diverse working conditions and shows significant application potential, underscoring its considerable engineering value.
关键词
多点柔性拉弯模具 /
扇式排布 /
头体设计 /
贴合假设 /
变形阶差假设 /
成形质量 /
有限元分析
Key words
multi-point flexible stretch-bending die /
fan-shaped arrangement /
die head design /
conformity assumption /
deformation step difference assumption /
forming quality /
finite element simulation
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