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

Patent metadata

Field	Value
Publication number	US-2018200767-A1
Application number	US-201615744076-A
Country	US
Kind code	A1
Filing date	Apr 23, 2016
Priority date	Aug 17, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

The present invention mainly relates to the technical field of extruding, rolling and drawing metal wire or rod, in particular to a method for rolling metal wire or rod with assistance of combined static magnetic field, characterized in that, a combined static magnetic field is applied before and during extrusion and pulling of a metal wire or rod. A specific method is: providing, in a moving direction of a metal wire or rod, a gradient static magnetic field generated by a combination of a permanent magnet and a steady electromagnet; and after a raw material for rolling the metal wire or rod is processed by the gradient static magnetic field, performing rolling extrusion and pulling on the material. For multiple passes of rolling extrusion and pulling, the static magnetic field processing is performed before each pass of rolling. By means of the method, the deformation resistance of the material is significantly reduced, defects of rolling are decreased, the size accuracy and uniformity of finished products is high, and the mechanical properties, especially strength and toughness, of the material are enhanced, thereby realizing the reinforcement of both the strength and toughness of the material.

First claim

1 . 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.

2 . The method for rolling metal wires or rods with assistance of combined static magnetic field according to claim 1 , characterized in that, for multiple passes of rolling, extruding and drawing, the blank is treated in a static magnetic field before each pass of rolling, extruding and drawing.

3 . The method for rolling metal wires or rods with assistance of combined static magnetic field according to claim 1 , characterized in that, for arranging static magnetic field in the travel direction of the blank of metal wire or rod, the static magnetic field arranged for the second pass of rolling is a gradient magnetic field formed by a group of permanent magnets and a steady electromagnet that are disposed in parallel in the travel direction of the blank of metal wire or rod; the magnetic induction intensity of the permanent magnets is 0.51-0.99 T, and the width of the permanent magnets in the travel direction of the blank of metal wire or rod, i.e., the width of action zone, is 0.5-1.0 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.

4 . The method for rolling metal wires or rods with assistance of combined static magnetic field according to claim 1 , characterized in that, for arranging static magnetic field in the travel direction of the blank of metal wire or rod, the static magnetic field arranged for multiple passes of rolling after the second pass of rolling is a magnetic field formed by a group of permanent magnets; the magnetic induction intensity of the permanent magnets is 0.31-0.75 T, and the width of the permanent magnets in the travel direction of the blank of metal wire or rod, i.e., the width of action zone, is 0.5-1.0 m.

5 . The method for rolling metal wires or rods with assistance of combined static magnetic field according to claim 1 , characterized in that, when the static magnetic field is a magnetic field generated by permanent magnets, the permanent magnet may be an U-shaped magnet or a circular magnet; in case that an U-shaped magnet is used, the longitudinal center line of the blank of metal wire or rod is in the same line as the center line of the notch of the U-shaped magnet; in case that a circular magnet is used, the longitudinal center line of the blank of metal wire or rod is in the same line as the center line of the circular magnet.

Assignees

• Univ Jiangsu

Inventors

• Wang Hongming
• Li Guirong

Classifications

• B21B1/18 Primary

  in a continuous process · CPC title

• B21B1/463

  in a continuous process, i.e. the cast not being cut before rolling · CPC title

• B21B1/42

  for step-by-step or planetary rolling (making tubes by pilgrim-step rolling B21B21/00) · CPC title

• B21B9/00

  Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills · CPC title

• C22F1/057

  of alloys with copper as the next major constituent · CPC title