Papers by Keyword: Hyperboloid Shallow Shell

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Authors: Li Hong Zhao, Zheng Yi Ren, Shu Yong Jiang, Nan Yang
Abstract: Impact line is one of important factors to affect the shape accuracy and surface quality of auto body panel design and manufacture. It is difficult to study because of the complexity shape of auto body panels. The system of test analysis on impact line is established by analyzing the shapes and forming processes of auto-body panels, of which based on hyperboloid shallow shells. The criterion and research technique of impact line are introduced. Extensive experiment results, which show the effects of forming process conditions, such as blank holding force, draw bead arrangement, and lubrication on impact line, are achieved. It can be concluded that the draw bead arrangement significantly influence the impact line, the displacement of impact line is different with difference of blank holding force and the friction coefficient.
Authors: Li Hong Zhao, Cheng Xi Lei, Zhong Wen Xing, Bin Wu
Abstract: Stiffness is a very important property of automobile panel, especially for high-strength thinning sheet due to personnel security and energy conservation on auto industry. It is difficult to study because of the complexity streamline feature of auto body. An experiment method for determining stiffness was presented. The experiment study models of which based on the hyperboloid shallow shells that could represent automobile panel’s surface features was established. The criterion and research technique of automobile panel stiffness were introduced. The experiment research works of effects of two main process conditions on stiffness which blank holding force (BHF) and boundary condition during the stiffness test were obtained. All conclusions provided a particularly effective process guidance and technical approach in the automobile panel production.
Authors: Li Hong Zhao, Y.F. Zheng, Zhong Wen Xing
Abstract: The impact line is a remarkable disadvantage in the auto body panels forming. It is difficult to study because of the complexity shape of automotive panels. The finite element models of hyperboloid shallow shells that can represent automotive panels are established, and suitability of finite element analysis to induce the impact line of automotive panel is carried out. The experiment test method for determining impact line is presented also. The criterion and research technique of auto body panels impact line are introduced. The consistency of results of simulation and experiment shows that the numerical simulation on research of impact line is accurate and feasible. Finally, research works of simulation and experiment on controlling impact line measures are carried out: effects of blank holding force (BHF), sheet thickness and lubricating modes on the impact line are obtained.
Authors: Yin Fang Jiang, Zhi Fei Li, Zhen Zhou Tang, Lei Fang
Abstract: With more and more attention to the technology of tailor welded blanks (TWBs), it is vital to study the springback of TWBs. In this paper, the springback law of parallel and perpendicular to the weld of TWBs hyperboloid shallow shell affected by blank holder force, punch string height, and the difference of blank thickness was researched by finite element software. The results show that: by means of drawing and trimming, the springback of TWBs can be reduced, and the curvature of TWBs is less parallel to the weld, but the curvature is larger perpendicular to the weld. The effect of blank holder force on the trimming springback is relatively small in the range of experimental date. With the punch string height increasing, the drawing and the trimming springback are both increased firstly and then gradually decreased perpendicular to the weld, and the drawing and the trimming springback are both decreased parallel to the welding. And perpendicular to the weld, with the increase of the quadratic difference of thickness, the drawing springback of the thinner side is gradully decreased, and the drawing springback of the thicker side is gradually increased, after trimming, the springback of the thinner and the thicker side are both less than the drawing springback, and parallel to the weld, the drawing and the trimming springback are decreased firstly and then increased with the increase of the quadratic difference of thickness.
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