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The complex method for evaluating the lubricating properties of technological lubricants and stresses when drawing axisymmetric products from sheet steel has been presented. To determine the friction coefficients in friction units during deep drawing the end-face friction, a test machine has been used simulating the contact coupling of friction units during the sheet steel drawing. Determination of the friction coefficients of friction units has been carried out when they were lubricated with technological lubricant RE-18 that contains fractal structures with copper, bronze, and zinc nanopowders adsorbed on these structures. The evaluation of the effectiveness of technological lubricants SL-2M, technical castor oil, and RE-18 during the sheet steel drawing has been performed on a modernized machine for testing the technological properties of sheet metal MTS-10H-1. The effectiveness of lubricants has been evaluated according to the proposed criteria: the force corresponding to the yield strength of the sample material; the maximum tensile force of the sample; the average diameter of the flange after drawing; the coefficient of ultimate strain; the difference between the diameters of the billet and the flange; the coefficient of relative ultimate strain; the drawing depth; the relative drawing depth. The determination of stresses in sheet materials is made using the model of sheet steel drawing in the ANSYS Workbench universal software system for finite element analysis. |
