Patent ID: 6185967
Filing Date: 2001-02-13
Classification: B21B

Abstract:
A strip threading speed controlling apparatus for a tandem rolling mill, having a series of rolling stands arranged in tandem, each including a speed controller for controlling a rotating speed of each roll, for threading a rolled material sequentially through said series of rolling stands and rolling the rolled material, said apparatus comprising:set up calculation means for calculating speed set values of two rolling stands adjacent to each other by use of a forward slip predicted in consideration of a back tension without considering a front tension in an upstream-side rolling stand of said two rolling stands, and a forward slip predicted without considering tension in the downstream-side rolling stand, and thereafter calculating the speed set value of each of said rolling stands by shifting said rolling stands stage by stage; andset up execution means for distributing the speed set value calculated by said set up calculation means to a corresponding speed controller.