32-38 STAREA DE TENSIUNI ȘI DEFORMAȚII LA PERFORAREA ȚAGLELOR PENTRU ȚEVI FĂRĂ SUDURĂ
TENSION AND DEFORMATION state at billet perforation for seamless pipes
The paper analyses the particularities of perforation through helical rolling of filled billets to achieve blanks for seamless pipes. Also, clarify the plastic flow phenomenon caused by the stress and strain state, which determine the formation of the cavity.
Keywords: rolling helical cylinder bitronconic cavity, blanks, seamless, tubes (laminate tubes)
Cuvinte cheie: laminare elicoidală, cilindri bitronconici, cavitate, eboșe, țevi fără sudură (țevi laminate)