轎車骨架件連續(xù)沖壓成形關(guān)鍵技術(shù)研究
[Abstract]:In 2009, China overtook Japan, the United States and Germany in producing 13.791 million cars to become the world's largest producer of cars. With the continuous growth of automobile output and the continuous improvement of die manufacturing level, the automobile panel die manufacturing industry has also been developed rapidly. Automobile panels include external panels, inner panels and skeleton panels. The outer panel refers to the stamping part with the appearance shape of the automobile body, and the inner panel refers to the stamping part inside the automobile body, which, together with the outer panel, forms a white body after welding with the skeleton cover. Skeleton panel (abbreviated as bone frame) refers to the stamping parts which connect the inner and outer panels to strengthen. Compared with the general stamping parts, the skeleton panel has the characteristics of large structure size, complex shape, spatial surface and so on. Skeleton panels are generally manufactured by continuous stamping technology, which usually need to go through blanking, bending, local deformation, flanging, shaping, punching, cutting and cutting, so the forming difficulty is high. In this paper, the continuous stamping forming of BMW F45 reinforced D column (left / right) of BMW car is taken as the research object. The main work is as follows: the stamping process of the strengthened D column is analyzed, and the continuous stamping process scheme of 10 stations is designed. The layout diagram is designed. The continuous stamping process of strengthening D column is simulated by AUTOFORM software, and all kinds of forming defects in the forming process are predicted, the accurate design method of blank is studied, and the structure design of continuous die is deeply studied. The reliability and accuracy of finite element numerical simulation with AUTOFORM software and the rationality of die structure design are verified by die test. The practice proves that the research results are of guiding significance for the design of continuous stamping process scheme and continuous die structure of car skeleton panels. The research contents and conclusions of this paper are as follows: (1) the skeleton panels are generally left and right symmetrical parts, which can be considered for stamping on the same set of dies. In this way, the die manufacturing cost can be reduced. (2) the stamping process scheme of skeleton panel is generally punching the leading hole, cutting edge and other separation stations in the front, local deformation, bending, flanging, shaping and other forming positions in the middle, punching. Cutting off equal station at the end. (3) skeleton panels generally do not arrange trimming process, but adopt the method of accurate design of blank shape and size. The application of AUTOFORM software can meet the requirements of blank shape and size. (4) in general, the application of AUTOFORM software to single station multi-process finite element numerical simulation of skeleton panels can meet the requirements of forming analysis. If the defects such as rupture and wrinkling occur in the simulation, they can be solved by modifying the stamping process scheme or modifying the blank shape. (5) the finite element numerical simulation of single station and multi-process is carried out by using AUTOFORM software. The thickness change of the parts after forming can be predicted more accurately. For the strengthened D column, the maximum relative error is 2.88%. (6) the springback size can be predicted by using AUTOFORM software, and springback compensation can be made. The springback of car skeleton panels is usually small, which can not be taken into account in the early stage of die design, and the structure of the die can be modified according to the actual springback of the product in the later stage of die design. (7) take strengthening D column as an example. The structure of continuous die for skeleton panel is studied deeply, and the design method and key points are summarized. The test results show that the method is feasible. (8) through stamping test, It is proved that the determined stamping process scheme, finite element numerical simulation results and die design method are feasible, which can guide the continuous stamping forming process and die design of actual skeleton panels.
【學(xué)位授予單位】:華南理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TG386;U466
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