汽車(chē)前托架成形過(guò)程研究
[Abstract]:The numerical simulation technology of sheet metal forming can not only predict the forming defects, but also optimize the process parameters, analyze the forming process and evaluate the design scheme of the die by using the numerical simulation technology of sheet metal forming. Thus, the die development cycle is shortened, the forming quality of sheet metal parts is improved, and the production cost is reduced. In the field of numerical simulation of sheet metal forming, many researches have been done, but there is little discussion about the optimization process of a complex forming part. But in the actual engineering, for some parts which are difficult to form, the qualified parts can not be obtained by debugging and retrying the simple process parameters. The three-dimensional profile of the front bracket part of an automobile is complex and difficult to form. For the stamping forming of this part, the forming process of the front bracket part is established, and the pre-processing setting of the numerical simulation of the drawing forming is analyzed, and the mesh division between the tool body and the sheet metal is emphatically analyzed. After trial calculation, the rationality of forming result and mesh division is analyzed. The results show that the sheet metal has fracture and wrinkle defects at the same time. Then three groups of experiments based on the change of single factor are made for the blank holder force, friction coefficient and stamping speed respectively, and the influence of them on the forming result is explored. The results show that the difference of the blank holder force and friction coefficient has a great influence on the forming results. With the increase of the blank holder force and friction coefficient, the number of fracture elements increases and the number of wrinkled elements decreases, while the forming speed has little effect on the forming results. It is found that the defects of rupture and wrinkle exist simultaneously under various technological parameters, and the die surface is modified reasonably by combining with the deformation analysis of the dangerous area of sheet metal rupture. On this basis, the process parameters of the blank holder force are further optimized. The optimized process parameters and die surface shape were used to test and debug and qualified forming parts were obtained. At the same time, the results obtained by the finite element method are in agreement with the results obtained by the finite element method, which verifies the rationality of the optimized process parameters and the shape of the die surface.
【學(xué)位授予單位】:西華大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TG386
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