Method for rolling metal wire or rod with assistance of combined static magnetic field

A method for rolling metal wires or rods with assistance of combined static magnetic field, characterized in that, a static magnetic field is arranged in the travel direction of a blank of metal wire or rod, the blank of metal wire or rod is subjected to the effect of the magnetic field when it passes through the area of the static magnetic field before the blank of metal wire or rod is rolled, extruded and drawn, the longitudinal center line of the blank of metal wire or rod is kept in line with the travel direction thereof, the blank is rolled, extruded and drawn by rollers after it is treated with assistance of the static magnetic field;

• the static magnetic field disposed for a first pass of rolling, i.e. initial rolling, is a gradient magnetic field formed by three groups of permanent magnets and a group of steady electromagnets that are disposed in parallel along the travel direction of the blank of metal wire or rod;
• among the three groups of permanent magnets, the magnetic induction intensity of the first group of permanent magnets is 0.01-0.30 T, and the width of the first group of permanent magnets in the travel direction of the blank of metal wire or rod, i.e., the width of action zone, is 0.1-1.0 m;
• the magnetic induction intensity of the second group of permanent magnets is 0.31-0.60 T, and the width of the second group of permanent magnets in the travel direction of the blank of metal wire or rod, i.e., the width of action zone, is 0.1-1.0 m;
• the magnetic induction intensity of the third group of permanent magnets is 0.61-0.99 T, and the width of the third group of permanent magnets in the travel direction of the blank of metal wire or rod, i.e., the width of action zone, is 0.1-1.0 m;
• the steady electromagnet is an annular DC superconducting magnet, the magnetic induction intensity thereof is 1.01-3.00 T, the central axis thereof is in the same line as the central axis of the blank of metal wire or rod, and the width thereof in the travel direction of the blank of metal wire or rod, i.e., the width of action zone, is 0.1-1.0 m.