Coil material and method for manufacturing the same

摘要

A coil material capable of contributing to an improvement of the productivity of a high-strength magnesium alloy sheet and a method for manufacturing the coil material are provided. Regarding the method for manufacturing a coil material through coiling of a sheet material formed from a metal into the shape of a cylinder, so as to produce the coil material, the sheet material is a cast material of a magnesium alloy discharged from a continuous casting machine and the thickness t (mm) thereof is 7 mm or less. The sheet material 1 is coiled with a coiler while the temperature T (° C.) of the sheet material 1 just before coiling is controlled to be a temperature at which the surface strain ((t/R)×100) represented by the thickness t and the bending radius R (mm) of the sheet material 1 becomes less than or equal to the elongation at room temperature of the sheet material 1.

主权项

1. A method for manufacturing a coil material through coiling of a sheet material formed from a metal into the shape of a cylinder so as to produce the coil material, the method characterized by comprising the step of:
coiling the sheet material with a coiler while the Centigrade temperature T of the sheet material just before coiling is controlled to be a temperature at which the surface strain, (t/R)×100, wherein t represents the thickness and R represents the bending radius in millimeters, of the sheet material becomes less than or equal to the elongation at room temperature of the sheet material, wherein T is higher then 100, wherein the controlling of the Centigrade temperature T of the sheet material just before coiling is applied to a place grasped by a chuck portion provided in the coiler; wherein the sheet material is a cast material of a magnesium alloy discharged from a continuous casting machine and the thickness t thereof is 7 mm or less, and a cast coil material having an elongation at room temperature of 10% or less is obtained, characterized in that the temperature of the sheet material is controlled in such a way as to make the temperature T of the sheet material just before coiling satisfy the following formula, where the minimum bending radius in coiling with the coiler is represented by Rmin, in millimeters:(T-80)2450+302800≧tR⁢⁢min.[Equation⁢⁢1]