Study On TWB Stamping Forming And TWB Optimizing Design

In recent years, the automobile industries have paid more and more attention on weight reduction and fuel Consumption. Tailor-welded blank (TWB) is commonly used as new kind sheet metal in automotive panels manufacturing to reduce weight and make car body strong. TWB consists of two or more sheets that have been welded together in a same plane prior to forming. The sheets can be not identical; they have different thickness, or mechanical properties or different coat each other. Some factors are important for the TWB's formability that are the blank holder force, different thickness and sheet metal, and weld shape or positon. In this paper, after the effects of the above factors on TWB's formability have been studied, the shapes of the sheets which compose TWB and initial weld position have also been studied based on the effects. In this paper, numerical simulation and experiments have been used to study the TWB's formability. Box-drawing process has been simulated by eta/Dynaform software. Moving distance of weld has also been studied by the numerical regression. The difference of TWB's formability with straight weld or curve weld has been compared. Box-drawing process has also been studied by the experiments, and simulated results are examined by the experiments.Simuation and experimental research prove that these parameters play very important role in the stamping process of TWB that are the blank holder force, the thickness ratio, the different mechanical properties of sheet metal that compose TWB. It is shown by the stimulation and experiments that the numerical regression is the efficient way to study the weld movements, and also provides basis to design the initial weld position and the optimize the TWB configuration.Designing efficiently the blank holder force, thickness ratio, weld position and weld configuration can help avoid crinckling and cracking during the process of stamping of TWB to gain parts of fine configuration and properties. And it provides research foundation for further resolving the key problems during TWB stamping process. Therefore, research contents in this paper have important theoretical significance of and engineering application values for designing the stamping technology of TWB.