关键词: 板材液压成形, 车身覆盖件, 成形精度, 充液拉深, 拉深比, 起皱, 曲面件

Abstract: With the development of sheet metal parts on large size, thin-wall, deep cavity, complicated curved-surface and hard forming materials, the manufacturing industries, such as aviation, aerospace and automobile industry, have paid more attentions to the low-cost and high flexible sheet hydroforming technology, which is up against new opportunities and challenges. The state-of-the-art of sheet hydroforming technology is introduced, and the new developing technologies, including hydromechanical deep drawing with independent radial hydraulic pressure, pre-bulging hydromechanical deep drawing, hydromechanical deep drawing with double-side hydraulic pressures, double sheets hydroforming and warn sheet hydroforming, are presented in detail. The current application statements of domestic and foreign on the domains of automobile, aerospace and others are summarized, the progress of R&D on sheet hydroforming equipments are reviewed, and the words’ largest sheet hydroforming equipment with tonnage of 150 MN and liquid volume of 5 m3 is introduced, the development tendency of sheet hydroforming technology is prospected.

Key words: auto-body panels, curved-surface part, deep drawing ratio, forming precision, hydromechanical deep drawing, sheet hydroforming, wrinkling