Abstract
The accurate description of friction is critical in the finite element (FE) simulation of the sheet metal forming process. Usually, friction is oversimplified through the use of a constant Coulomb friction coefficient. In this study, the application of an existing multiscale friction model is extended to the hot stamping process. The model accounts for the effects of tool and sheet metal surface topography as well as the evolution of contact pressure, temperature, and bulk strain during hot stamping. Normal load flattening and strip drawing experiments are performed to calibrate the model. The results show that the model can relatively well predict friction in strip draw experiments when the tool surface evolution due to wear is incorporated. Finally, the application of the formulated multiscale friction model was demonstrated in the FE simulation of a hot-stamped part.
Highlights
Hot stamping is used in the automotive industry to produce high-strength structural parts
The results revealed that the tool wear the did not significantly deform after loading; the tool wear did not affect the prediction of the real contact area in normal loading models
The output is a database of COFs and real contact areas that is implemented in a full-scale Finite element (FE) model
Summary
Hot stamping is used in the automotive industry to produce high-strength structural parts In this process, a sheet metal blank is heated in a furnace, formed at high temperature values (600–800 °C), and quenched in the press to obtain a high-strength part with satisfactory geometrical tolerance. The description of friction in the FE simulations of hot stamping processes is usually oversimplified by the use a constant Coulomb friction coefficient (COF) [1, 3,4,5]; the actual conditions are not well represented. The description of these conditions is the focus of this study
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