Abstract
Friction is generated between a press tool and a material during the inflow of material in an automotive press drawing process. Currently, there is deficienttechnical information on such tool-material friction properties. This study is accordingly aimed to understand friction characteristics by investigating them from drawing variables in the press deep-drawing process for steel plates of 590MPa grade and above that are recently being applied for the reduction of weight and improvement of safety of automobiles. The drawing variables in this study are blank holder holding pressure, drawing velocity, and tool surface treatment, which are tested and applied for stamping analysis. The results showed that for holding pressure and drawing velocity, friction coefficient decreases as holding pressure and drawing velocity increases. In case of friction properties according to tool surface treatment, friction coefficient is lower in surface-treated tools compared to non-surface-treated tools, which verifies the need for surface treatment when fabricating press tools. In addition, this study ascertained the need to have a stamping analysis that considered actual drawing variables when analyzingforming by verifying the results of drawing simulations after applying the experimented friction coefficient in the stamping analysis.
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