MODELING IN THE DESIGN OF TECHNOLOGICAL PROCESSES FOR DRAWING WITH WALL THINNING OF HOLLOW AXISYMMETRIC PARTS FOR VARIOUS PURPOSES

There are a number of products that operate under extremely difficult conditions of complex loading, the manufacture of which by traditional stamping operations does not provide the required properties, which leads to a large number of defects. One of the possible directions for the manufacture of products of increased strength is the introduction into the technological process of methods of intense plastic deformation, which can be either volumetric (equal-channel angular pressing, longitudinal extrusion through a channel of variable cross-section, drawing with wall thinning along the internal contour) or surface (grinding holes, rolling with rollers or balls). The study demonstrates the application of the approximate monotonicity criterion and its relationship with technological parameters, using the example of a deep drawing process with wall thinning. A case is presented where technological parameters, including friction conditions and the degree of deformation, are selected to ensure approximate monotonicity during the thinning process. The findings provide a basis for the rational selection of the "strain-stress" curve, contributing to a more accurate and efficient design of deformation processes.