In the process of molding sheet metal forming tools, numerical programs are used to simulate the behavior of the forming material in the transformation process. The problem posed is that, in reoccurring cases, real geometry deviates slightly from the simulated one. In this paper, we examined the deviation of the real product geometry from the theoretical model and the simulated product geometry from the theoretical model. We observed that a deviation of geometry occurs in the transformation of platinum of three different materials, the orientation of the platinum in the tool and the deviations due to the circumcision method of the product. We analyzed the trimming of the product with a laser compared to cutting it with knives in the tool. For a particular combination of material, the orientation of platinum and the method of circumcision, we compared the deviations of the real experimental geometry with the simulated one. We wanted to highlight key factors which have a major impact on the reliability of the simulation results. The blank material has a significant impact since materials with low yield strength are very sensitive to small changes of loads at forming, on the other hand, spring back is very influential on part geometry made from materials with high elastic strain. The orientation of blank should be taken into account in the simulations of the transformation of anisotropic materials. The geometry of the laser cut parts does not differ significantly from parts cut in the tool with knives, but at the same time, the circumcision has a small effect on the geometry of the product.
|
