脉动液压成形技术与设备

介绍脉动液压成形技术的成形原理、工艺特点及应用领域。从工艺和材料两方面对脉动液压成形提高材料成形能力的机理进行研究，试验证明脉动载荷一方面能够促进管材液压成形时的补料、降低摩擦力的阻碍作用并利用成形过程中小褶皱的出现与消失提高变形的均匀性；另一方面，对于奥氏体不锈钢，脉动载荷可以增强形变过程中的相变增塑效应，从而提高其成形性。自主设计并研制出能实现工业化生产需求的自动化程度高的脉动液压成形设备，为该项技术在汽车、航空及航天制造领域中的推广和应用提供重要的理论指导和实践探索。

Technology and Equipment of the Pulsating Hydroforming Technolog

Forming theories, processes properties, mechanism and industrial application of the novel pulsating hydroforming are introduced. The formability can be improved by pulsating hydroforming in which the effect on formability should be understood from two different aspects of process parameters and material properties. The tube is uniformly expanded by repeating the appearance and disappearance of small wrinkling and the contact friction force between the tube and die is reduced under the pulsating load path condition. On the other hand, the enhanced transformation induced plasticity(TRIP) effect can improve the formability of austenitic stainless steel by pulsating load. Pulsating hydroforming equipment has been independently designed and developed which is composed of axial feed control system, liquid filling system and high pressure creation and pulsating load control system. The research results have both important theoretical significance and practical potential in application of pulsating hydroforming technology in the fields of automobile, aeronautical and astronautical industry.