INVESTIGATING THE PROCESS OF PRESSING THE SINTERED THIN-WALL PIPE IN A CONICAL MATRIX BY A SIMPLIFIED METHOD

Abstract

The processes of pressing and drawing pipes in the same conical matrix differ in the loading patterns. Some similarities and differences in solving these problems are observed. Considering that the drawing process, using the simplified method is studied quite completely, to study the pressing process, a comparative analysis of the case for solving the drawing problem, using the simplified method is carried out.

The stress and strain states of the pressed and drawing pipes are evaluated. The simplification of the main equilibrium equation for solving the problem of drawing the tubes in the absence of contact friction, and to solve the problem on the tube pressing a simpler plasticity condition is chosen is justified. For solving the pressing problems, the basic equilibrium equation and the plasticity conditions are discussed.

At pressing sintered tubes, to determine the porosity, the equation of the deformation theory of plasticity of porous materials is used. Numerical calculations were performed in the MS EXEL software environment with an initial porosity of the pipe material of 10, 20 and 30%.

The dimensionless meridian, circumferential and average stresses of the pipe, as well as the change in the strain intensity and the current porosity, depending on the pipe dimensionless radius parameter are determined.