Numerical investigation of the effect of backtension load on round bar drawing process
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Backtension load is a crucial process variable in bar or wire drawing process. In this study, the effect of backtension load during round bar drawing process was quantitatively investigated using numerical analysis. For two reduction areas of 30% and 40%, various backtension loads were applied to evaluate the drawing load, radius change, average drawing stress, cross-sectional strain distribution, residual stress distribution, and the stress distribution in the drawn bar and the die after the drawing process. The results of numerical analysis indicate that these values are significantly affected by the magnitude of the backtension load. For instance, as the backtension load increases, the drawing load and the average drawing stress also increase. When the backtension load exceeds a critical value, necking occurs due to plastic deformation of the material passing through the die, making the drawing process infeasible.
Abstract
Backtension load is a crucial process variable in bar or wire drawing process. In this study, the effect of backtension load during round bar drawing process was quantitatively investigated using numerical analysis. For two reduction areas of 30% and 40%, various backtension loads were applied to evaluate the drawing load, radius change, average drawing stress, cross-sectional strain distribution, residual stress distribution, and the stress distribution in the drawn bar and the die after the drawing process. The results of numerical analysis indicate that these values are significantly affected by the magnitude of the backtension load. For instance, as the backtension load increases, the drawing load and the average drawing stress also increase. When the backtension load exceeds a critical value, necking occurs due to plastic deformation of the material passing through the die, making the drawing process infeasible.