METHOD FOR MAKING BRANCHED PARTS Russian patent published in 2000 - IPC

FIELD: machine engineering, possibly manufacture of branched parts of pipelines such as T-pieces, cross pieces. SUBSTANCE: method comprises steps of bending blank along axis of branch pipe with inner radius equal to 1-2 thickness values of initial blank; applying bending efforts in plane passing through axes of tubular blank and branch pipe for preliminarily accumulating blank material in zone of branch pipe; forming branch pipe by hydrostatic shaping; simultaneously upsetting blank at both ends by applying to it in bending plane straightening efforts directed opposite relative to bending efforts; after hydrostatic shaping and upsetting blank one or two times successively realizing operations of bending tubular blank, subjecting it to hydrostatic shaping and upsetting at both ends. EFFECT: lowered cost price of branched parts. 3 cl, 9 dwg, 1 ex