METHOD OF PRODUCING SLEEVES

摘要

FIELD: process engineering. ^ SUBSTANCE: invention aims at improving quality of inner surfaces of tubes and sleeves in production of seamless hot-rolled tubes and sleeves at rotary piercer with cooled mandrel. Proposed method comprises piercing heated billet in rotary piercer with forced coolant feed on inner and outer surfaces. Note here that coolant is fed at overpressure. ^ EFFECT: higher wear resistance of mandrel. ^ 1 ex