Change rolling speed during hot continuous rolling

摘要

The present invention relates to a rolling speed changing method during hot continuous rolling which can minimize the abnormal rolling condition occurring at the time when a welded portion passes through a rolling mill during continuous continuous rolling by effectively changing the speed of a periodical motor of a rolling mill in a hot rolling mill The purpose is to provide.;According to the present invention for achieving the above object, when a stand on which a welding portion x passes is referred to as a set value of a rolling speed necessary for hot continuous rolling, and a stand which has already passed a welding portion is represented by j, The setting of the rolling speed of j stand, which should be changed when reaching the stand, Lt; / RTI It is preferable that the rolling speed set value is changed by a ramp rolling speed changing method that gradually changes from a moment when the welding portion arrives at the rolling mill to a predetermined rolling speed for a predetermined time.