金属双层管冲/液压复合成形机理与规律的研究

Stamping and hydroforming technology, as a new compound metalworking process in which the combined use of a tube hydroforming and a stamping press forms the desired shape, has the advantages of them, so it possesses a good prospect of development and practical application in manufacturing of lightweight and integration. In this project, researches are conducted on the dynamic mechanical behavior, the plastic constitutive relationship, the optimizing load parameter and the microstructure evolution of bimetallic tube in stamping and hydroforming in order to reveal the forming mechanism and deformation rule of the tubes. The researches are focused on the following. Initially, the dynamic mechanical behavior is analyzed to reveal the mechanical relationship of bimetallic tube based on stamping and hydroforming. Secondly, the plastic constitutive relationship of the tubes is investigated based to the characteristics of dynamic strain field and strain rate. Thirdly, the optimization method of load parameters is explored in order to increase the formability of bimetallic tube,and a new method of forming limit is adopted under complex loading conditions. Finally, the influence of the impact load on the microstructure of the tubes is analyzed and the relationships of the formability and the microstructure evolution are established. The research results of the project will lay the theoretical foundation for bimetallic tube, and provide scientific basis and technical support for expanding its applied scope.

冲/液压成形作为在液压胀形和冲压成形基础上发展起来的一种新型复合成形方法，兼具液压胀形和冲压成形的优点，在轻量化、一体化制造领域具有良好的发展前景和应用价值。本项目通过对金属双层管在冲/液压复合成形时的动态力学行为、塑性本构关系、载荷参数优化、微观组织结构的研究，揭示冲/液压加载方式下金属薄壁管的成形机理与变形规律。具体内容包括：研究基于冲/液压环境下管间动态力学行为，揭示双层管各状态下动态力学关系；基于动态应变场、和应变速率，构建金属薄壁管在冲击载荷作用下的塑性本构模型；探索以成形指标为目标的载荷参数优化方法，提出复杂加载条件下管材成形极限的新型判定依据；研究冲/液压载荷对管材微观组织结构演变的影响规律，揭示冲击液压成形能力与微观组织演变的关系。该项目将为金属薄壁管冲击液压成形技术奠定理论基础，为冲击液压成形技术的应用提供科学依据和技术支撑。

冲/液压成形作为在液压胀形和冲压成形基础上发展起来的一种新型复合成形方法，兼具液压胀形和冲压成形的优点，在轻量化、一体化制造领域具有良好的发展前景和应用价值。本项目通过对金属双层管在冲/液压复合成形时的动态力学行为、塑性本构关系、载荷参数优化、微观组织结构的研究，揭示冲/液压加载方式下金属薄壁管的成形机理与变形规律。具体内容包括：研究基于冲/液压环境下管间动态力学行为，揭示双层管各状态下动态力学关系；基于动态应变场、和应变速率，构建金属薄壁管在冲击载荷作用下的塑性本构模型；探索以成形指标为目标的载荷参数优化方法，提出复杂加载条件下管材成形极限的新型判定依据；研究冲/液压载荷对管材微观组织结构演变的影响规律，揭示冲击液压成形能力与微观组织演变的关系。该项目将为金属薄壁管冲击液压成形技术奠定理论基础，为冲击液压成形技术的应用提供科学依据和技术支撑。