Shishkin

This article covers problems relative to reduction of extremely thin-walled pipe shells in a rigid die with the use of a tooling shell. This problem was solved by an engineering method of prediction based on the stress equilibrium equation, approximate plasticity condition and the Laplace equation of momentless theory of shells. For calculation of this process, mathematical expressions were obtained and verified experimentally. Experimental researches were conducted with the use of tube shells made of aluminum alloys. It was found that contact friction between an extremely thin-walled shell and a tooling shell influence the process.