FABÍK Richard VŠB - Technická univerzita

At conventional lubrication during wire drawing it is possible to expect the value of the friction coefficient between 0.05 and 0.13. However, according to some authors it is possible to achieve under conditions of hydrodynamic lubrication (for example with use of compressive dies) a friction coefficient μ = 0.0005, it means hundred times lower. Such values already allow us to consider such technological parameters, which would lead at higher friction coefficients to unacceptably large total traction forces, or to wire breakage. We focus in this paper on the FEM analysis of drawing with small deformation angles of the die and large partial deformations. Apart from the normal cone die, we will focus also on sigmoidal die. The first part presents a simulation of drawing with use of small deformation angles and both types of dies, for friction values μ = 0.0005, 0.005, 0.05. We analyse the influence of the die geometry on the overall tensile force and the inhomogeneity of deformation intensity over the cross section of wire at single pass drawing. The second part of this paper presents a simulation of drawing by multiple passes with constant total reduction and various partial reduction. We analyse the effect of partial deformation of the inhomogeneity of deformation intensity over the cross section of the drawn wire.

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