METHOD TO PRODUCE METAL SLEEVES WITH GRADIENT SUB MICRO- AND NANO-CRYSTALLINE STRUCTURES

摘要

FIELD: process engineering. ^ SUBSTANCE: invention relates to metal forming, particularly to methods of producing sleeves with sub micro- and nano-crystalline structures. Hollow workpiece is produced with its inner surface to be processed by multiple axial reciprocation of male mould with simultaneous rolling and squeezing of outer surface in roller-type lower die. Roller-type lower die is rotated with angular speed of rotation equal to ëld. Note here that collet is rotated with constant speed of ëc=0,001ëld. ^ EFFECT: higher efficiency. ^ 1 dwg