PROCESS FOR MANUFACTURING ULTRATHIN WALL METALLIC PIPE BY COLD DRAWING METHOD

摘要

A process for manufacturing a metallic pipe with the use of a drawing machine, in which drawing reducing the wall thickness while increasing the wall thickness central diameter of pipe material is carried out using a solid die whose diameter is increased or decreased from its engaging entrance side toward its finish exit side and also using a plug or tapered mandrel whose diameter is increased from the entrance side toward the exit side of the die. Thus, there is provided a process for manufacturing an ultrathin wall metallic pipe by cold drawing method by which a marvelous wall thickness reduction can be attained.