Constant-radius rolling method and constant diameter impression total equipment of the metal tube

摘要

PROBLEM TO BE SOLVED: To provide an apparatus and method for a fixed diameter rolling of a metallic pipe capable of preventing the generation of flashes and obtaining an excellent circularity when a plurality of metallic pipes with the same specifications are produced from a plurality of tube stock with the same specifications. SOLUTION: A drafting position of the aperture die rolling at least a single stand of a plurality of basing stands set up to an either tube stock after the No.2 tube stock among a plurality of tube stock is adjusted based on the variations between a recorded value of the rolling information given by at least a single stand of a plurality of basing stands of the tube stock rolled by the fixed diameter rolling earlier than either tube stock after No.2 and a target value of the rolling information.