Strain state impact on formability in new cold pilger rolling process

摘要

Cold pilger rolling process is often used to producing of high quality tubes made from nonferrous metals and alloys. Both classical approach and new method of rolling with the stationary stand, ensures high quality of the product - tube surface, and mechanical properties. In this paper, analysis of the new concept with stationary stand and KOBO method was presented. Strain fields in deformation zone investigations were taken on aluminum tubes, both, with and without VSS head, which allows add additional torque moment during rolling. VSS head causes strain state modification in temporary rolling zone. Basis on mechanical states, due to Pelczynski concept, strain states was investigated on both variants. Maximum formability calculation was also investigated in this work. Due to the results theoretical calculation were confirmed, so the KOBO method can be implemented in coldpilger rolling process.