| 摘要 |
FIELD: pipe rolling. SUBSTANCE: method involves connecting mandrel with rod by spring grip, with rod being in extreme rear position; piercing casing; providing abutment of mandrel end against mandrel remover and moving rod backward in front of casing rear end to effectuate disintegration of rod and mandrel; removing mandrel; moving rod free of mandrel through casing and transferring casing from piercing zone in the direction transverse to piercing axis. EFFECT: increased efficiency, simplified method. 3 dwg |
