Method for controlling a tension of a metal strip in a heat treatment furnace

摘要

A method for controlling a tension of a metal strip in a heat treatment furnace comprises the steps of: (a) travelling a metal strip through a plurality of tapered rolls; (b) measuring a tension ( sigma ) working on the metal strip through at least one of the tapered rolls; (c) computing a critical tension ( sigma er ) which generates heat buckle ; and (d) controlling the tension measured by the step (b) to be over the tension ( sigma min ) sufficient to prevent transverse displacement but less than the critical tension ( sigma er) which generates heat buckle.